Anti-Lock Braking System (ABS) for Trucks, Tractors and Buses
Contents
1. NOTE Typical illustrations in this manual use the 4S AM configuration as a sample Layouts for 4S AM 65 4 and 6S 6M configurations are included in Appendix MM30 Page4 Revised 04 01 Section 1 IMERITOR WABCO Introduction ABS Indicator Lamp The ABS indicator lamp works as follows Ignition ON ABS lamp comes on at ignition Normal Operation momentarily for a bulb check then System is goes out When vehicle is driven at speeds above 4 mph 6 km h lamp goes out System is O K ABS lamp does not go out at ignition After servicing ABS Off road ABS operation Refer to Off Road ABS in this section The vehicle s normal ABS function is being modified due to road conditions ABS lamp flashes during vehicle operation Lamp does not go out at speeds above 4 mph 6 km h a fault exists in the ABS system ABS lamp does not go out at Existing Fault ignition NOTE If the ECU senses a fault during normal vehicle operation the ABS indicator lamp will come on and stay on ABS Modulator Valves Modulator valves control the air pressure to each affected brake during an ABS function Figure 1 6 Valve Arrangement Option In Figure 1 5 the modulator valves on the rear axle are mounted separately and a relay valve is used to deliver air pressure to the modulator valves There is also an optional valve package available from Meritor WABCO the ABS Valve Package which may be2. Stored Faults ABS Indicator Lamp flashes eight times Eight flashes not received MERITOR WABCO No recognizable active faults in the ABS No action required Inspect wiring Inspect bulb Make necessary repairs Continue with blink code diagnostics Go to Step Continue with blink code diagnostics Go to Step Drive vehicle lamp will go out when vehicle reaches 4 mph 6 km h Connect ECU Determine if fault is active or stored Active Fault Lamp will repeatedly display one code Stored Fault Lamp will display code for each stored fault then stop blinking Faults will be displayed one time only Find definition for blink code on blink code chart Make the necessary repairs Repeat Steps I Il until System code 1 1 received Record for future reference NOTE Last fault stored is first fault displayed All stored faults successfully cleared Turn ignition OFF Active faults still exist repeat Steps through V Revised 04 01 Section 3 MERTTOR WABCO Troubleshooting amp Testing Blink Codes Illustrated Figure 3 8 Active Fault 18 18 Rashes Continues until 2 95 4 5 s 2099 ignition is turned off Light ON 1st Digit 2nd Digit Repeat of Blink Code 2 3 2 3 Example Blink Code 2 3 Fault in ABS modulator valve right rear drive axle D 1 Second Stored
3. O3LSIML n 2 OND e 93 aN 0 9 6 1 21v HOLIMS HOLIAS s sav ay sev O3sn LON 5 6561 v 6 m ED uec Gay e 6261 2261 s ity 5it m p en Se a uua 38 28 iva CSTR 6 6 1 8 NNOD NId 81 Revised 04 01 Appendix Il lagrams D Wiring Cab Mounted ABS ATC ECU lon D Vers MM30 Page 44 lagrams LNAWdINDA WNOIL1dO SWALSAS W9 S9 59 Q3Sn 4OIO3NNOO NId ZI Appendix Il iring D W 11 OION3J0S W9 S9 ANI sav 137100 I3WI 1HOIM OYE NNOO NId imuno o 0 705 qasn L RI vas O3Sn LON O3sn LON 1311 0 W9 S9 59 5 1H918 Gus WIVd O31SIMl 0390 3105 YOSN3S MOSN3S ANO W9 S9 9 59 WOSN3S 1331 3 XV Que QN9 imino l13NI 405 35 5 5 W9 S9 r 3ATVA Sav 1337 31xXv MN YOLIANNOD 40 OVE gasn 10N O3Sn 10 5 LON GIONS10 1 nae sev LHOTS OND zi oa E o1 i3 ufo HOSN3S Seem LHOTS UIVd 5 MOSN3S 1331 MOSN3S NN
4. Brown X4 Brown Sensor Resistance The sensor circuit resistance must be 900 2000 ohms Resistance can be measured at the sensor connector or at the pins on the ECU connector To measure resistance 1 Turn ignition OFF 2 To measure resistance at the sensor connector disconnect the ECU connector from the ECU To measure resistance at the sensor connector disconnect the sensor from the sensor extension cable 3 Measure output at the pins indicated in Table B Dynamometer Testing Vehicles with ATC A WARNING Failure to disable the ATC before dynamometer testing could result in serious personal injury and damage to the vehicle Vehicles with ATC must have the ATC disabled to test the vehicle on a dynamometer To disable the ATC press and hold the blink code switch for at least three seconds Once the system configuration code begins ATC has been disabled The ATC lamp comes on and stays on while ATC is disabled NOTE Removing the ABS circuit breaker fuse or removing the ECU power connector will also disable ABS and ATC or you may use the Pro Link to disable ATC MM30 Page 29 Section 3 Troubleshooting amp Testing MERITOR WABCO Valve Tests ABS Modulator Valve Measure resistance across each valve solenoid coil terminal and ground on the ABS valve to ensure 4 0 to 9 0 ohms for a 12 volt system 11 0 to 21 0 ohms for a 24 volt system Figure 3 18 If the resistance is greater than 9 0 ohms
5. ECU Type Configuration B Engine Dats Link Disable ATC Enebie ATC Rese Revised 04 01 Data Link Activation Select the Engine Data Link icon from the Main ABS Screen or use the pull down menu to send a limit engine torque command to the engine or a disable retarder command to the retarder Figure 3 14 Figure 3 14 NR Mentor WABCO ABS ECU Display Component Tests Help Mentor WABCO ABS Tractor ECU Disl ECU Information ECU Type Conligu ation Disable ATC Enable ATC Resat Momcrized Data Link E3 Select Destination Engre Disable or Enable ATC Select the Disable ATC icon or use the pull down menu on the ABS Main Screen to send the command to the ECU to disable automatic traction control ATC will remain disabled until the enable command is sent or until the vehicle ignition is cycled Always disable ATC for dynamometer testing Figure 3 15 Figure 3 15 Mentor WABCO ABS Tracer Component Tests Help Meritor WABCO ABS TractorECU Display ECU Information Wheel Sensor ECU Type RPM Configuration Erbe ATG Lelt Frank 7 o MM30 Page 23 Section 3 Troubleshooting amp Testing MERITOR WABCO Select the Enable ATC icon or use the pull down menu on the ABS Main Screen to send a command to the ECU to enable ATC This is the normal state
6. of the ECU Figure 3 16 Figure 3 16 Z Meritor WABCO ABS TractorECU Display Component Help ejos Information Engine Dala Link ECU Type Disable ATC Relay J Reset Memonzed NOTE The status bar on the ABS Main Screen reflects the current status of the ATC function enabled disabled or N A not available MPSI Pro Link 9000 NOTE You must use the D version cartridge 4 0 or higher with D version ECUs Use the Pro Link 9000 to e Diagnose system faults on ABS or ABS ATC systems e Perform component measurement and function tests NOTE The Pro Link 9000 may be used in place of blink code diagnostic procedures The Pro Link screens illustrated appear with D version ECUs Refer to Maintenance Manual 28 if you are using the Pro Link with C version ECUs MM30 Page 24 Component Tests Components that may be tested with the Pro Link 9000 are e Vehicle Voltages ABS Modulator Valves e ATC Valves ABS ATC Indicator Lamps e Sensors Engine Datalink e Retarder Relay e Retarder Datalink ABS ATC Switches Diagnostic and Testing Procedure 1 Slide the Meritor WABCO D version cartridge into the Pro Link keypad until the connection is tight Figure 3 17 2 Chockthe wheels apply the parking brake and make sure ignition power is off 3 Locate the 6 pin diagnostic receptacle in the vehicle cab Insert the 6 pin connector from the Pro Link in
7. 1 1 2 3 REAR ABS VALVE OPEN OR CABLE DAMAGE 4 Press FUNC to exit The following screen appears Remove power from the ECU make necessary repairs and recycle ECU TURN IGNITION OFF REPAIR EXISTING FAULT FUNC TO EXIT Press FUNC to return to Tractor ABS ATC menu TRACTOR ABS ATC MENU SELECTIONS T STORED FAULTS J Press ENTER to display stored faults A description of the stored fault appears In this example only one fault is stored in memory as indicated on line one Blink code and number of times the fault occurred also appear on line one Lines two and three provide a written description of the fault 1 1 2 3 REAR ABS VALVE OPEN OR CABLE DAMAGE 4 MM30 Page 26 Press FUNC to exit The following screen appears if you try to clear a stored code with an existing fault present Remove power from the ECU make necessary repairs and recycle ECU CANNOT ERASE STORED FAULTS REPAIR EXISTING FAULT S ENTER TO CONTINUE Clearing Stored Faults The screens you will see when clearing faults are illustrated below TRACTOR 45 4 DATA LINK J1922 EXISTING FAULT NO STORED FAULTS YES With some ECUs this line will not appear Press Arrow Down Key DATA LINK EXISTING FAULT STORED FAULTS FUNC FOR MENU There are no existing faults Select stored faults to view and clear memory Press FUNC to display menu Select Stored Faults TR
8. Faults Hold Displays all stored sy vo Pause Vv v Wn Pause or NS faults once last fault Jee 269 1s g 099 3093 HOE 15 059 697 94 stored is displayed first Light ON 1st Digit 2nd Digit 1st Digit 2nd Digit 1st Stored Fault 2nd Stored Fault 5 2 3 4 Example Blink Code 5 2 Sensor signal erratic left front steer axle 3 4 Too much sensor gap left rear drive axle Blink Code 1 1 System OK Light ON m 1002021b Continued on next page MM30 Revised 04 01 Page 17 Section 3 Troubleshooting amp Testing MERITOR WABCO Blink Codes Illustrated Continued D Note After faults are cleared and vehicle is started ABS lamp will stay 3 Faults Cleared on until vehicle is driven over 4 mph 6 km h Continues until Pause ignition is 9 4 2095092 PON turned off 8 Quick Blinks Faults Cleared System ID System ID System ID System ID 2 2 2 2 D System Configuration Code 2 4S 4M System 3 e Faults Not Cleared Active Faults Still Exist Continues until ignition is turned off Light ON System ID System ID System ID System ID 2 2 2 2 1002022 Working with Blink Codes Blink Code Conditions When using blink code diagnostics the following conditions could occur Blin
9. WABCO Section 4 Component Replacement 5 Insert the sensor cable through the hole in the spider and axle housing flange Route the cable to the frame rail Be sure to route the cable in a way that will prevent pinching or chafing and will allow sufficient movement for suspension travel 6 Connect the sensor cable to the chassis harness 7 Install the fasteners that hold the sensor cable in place Install the brake drum on the wheel hub Complete the installation per vehicle manufacturer s manual Valves ABS Modulator Valve Removal 1 Turn ignition switch to the OFF position apply parking brake A WARNING Park the vehicle on a level surface Block the wheels to prevent the vehicle from moving Support the vehicle with safety stands Do not work under a vehicle supported only by jacks Jacks can slip and fall over Serious personal injury can result 2 Put blocks under the front and rear tires to stop the vehicle from moving 3 If necessary raise the vehicle off the ground and put safety stands under the axle 4 Disconnect the wiring connector from the ABS valve 5 Disconnect the air lines from Ports 1 air supply and 2 air discharge of the ABS valve Figure 4 3 Revised 04 01 1002038a Port 1 Air In Port 2 Air Out 6 Remove the two mounting capscrews and nuts 7 Remove the ABS valve Installation A CAUTION Moisture can affect the performance of all ABS ATC systems a
10. at each power up If a memorized component is not present the ECU will record a fault For example if an ATC valve is memorized but is not present at the next power up the ECU records a fault This can occur if an ECU is moved from one truck to another and one or more of the memorized components are not available on the new truck If this occurs follow these steps to reconfigure the ECU Reconfiguration Procedure How to Reconfigure an ECU D Version Before reconfiguring the ECU contact ArvinMeritor s Customer Service Center at 800 535 5560 for additional information D version ECUs memorize the following components if they are connected at power up ATC valve Retarder relay Datalink SAE J1922 or SAE J1939 eio Rm Turn ignition ON Press and hold blink switch for at least three seconds NOTE Do not hold this switch longer than seven seconds Observe the ABS and ATC lamps While the configuration code is flashing press the blink code switch three times one second each with a one second pause between each Turn ignition OFF Revised 04 01 ABS lamp displays the ABS system configuration code One blink 65 6 Two blinks 45 4 Four blinks 65 4M The ABS lamp may display eight quick flashes before the system configuration code begins ATC lamp comes on and stays on ABS lamp will continuously blink the system configuration code ABS lamp displays
11. be equipped with a HEPA vacuum and worker arm sleeves With the enclosure in place use the HEPA vacuum to loosen and vacuum residue from the brake parts b alternative procedure use a catch basin with water and a biodegradable non phosphate water based detergent to wash the brake drum or rotor and other brake parts The solution should be applied with low pressure to prevent dust from becoming airborne Allow the solution to flow between the brake drum and the brake support or the brake rotor and caliper The wheel hub and brake assembly components should be thoroughly wetted to suppress dust before the brake shoes or brake pads are removed Wipe the brake parts clean with a cloth c lfanenclosed vacuum system or brake washing equipment is not available carefully clean the brake parts in the open air Wet the parts with a solution applied with a pump spray bottle that creates a fine mist Use a solution containing water and if available a biodegradable non phosphate water based detergent The wheel hub and brake assembly components should be thoroughly wetted to suppress dust before the brake shoes or brake pads are removed Wipe the brake parts clean with a cloth d Weararespirator equipped with a HEPA filter approved by NIOSH or MSHA when grinding or machining brake linings In addition do such work in an area with a local exhaust ventilation system equipped with a HEPA filter e NEVER use compressed air by itself dry brushin
12. for a 12 volt system 21 0 ohms for a 24 volt system clean the electrical contacts in the solenoid Check the resistance again To check the cable and the ABS valve as one unit measure resistance across the pins on the ECU connector of the harness Check the diagram of the system you are testing for pin numbers Refer to Appendix II Figure 3 18 Open Style Connector 1002034b Ground Terminal Exhaust Solenoid blue wire Inlet Solenoid brown wire a 1002034b Exhaust Solenoid blue wire Inlet Solenoid brown wire Ground Terminal MM30 Page 30 ATC Valve Measure resistance across the two electrical terminals on the ATC valve to ensure 7 0 to 14 0 ohms for a 12 volt system 26 3 to 49 0 ohms for a 24 volt system Figure 3 19 If the resistance is greater than 14 0 ohms for a 12 volt system 49 0 ohms for a 24 volt system clean the electrical contacts on the solenoid Check the resistance again To check the cable and ATC valve as one unit measure resistance across the pins on the ECU connector of the harness Check the diagram of the system you are testing for pin numbers Refer to Appendix II Figure 3 19 1002035a NOTE Refer to Appendix III for ABS Valve Package Troubleshooting Guide Revised 04 01 MERITOR WABCO Section 4 Component Replacement Component Removal and Installation Valves e ABS Modulator Valves e ATC Valve ABS Valve Package F
13. of the vehicle Figure 1 1 100200a Revised 04 01 ECU Identification NOTE Do not open the ECU Opening the ECU to gain access to the internal components will void the warranty C and D version ECUs are easy to distinguish Figure 1 2 and Figure 1 3 Figure 1 2 1002001a 1 Cab Mounted 2 Frame Mounted C Version Use Maintenance Manual 28 Figure 1 3 1002002a Cab Mounted Frame Mounted Basic D Version Use Maintenance Manual 30 MM30 Page 3 Section 1 Introduction MERITOR WABCO The ECU version C or D appears on the part ABS Configuration number identification tag Figure 1 4 If you cannot identify the ECU version installed on NOTE With D Basic 4S AM is the only your vehicle contact ArvinMeritor s Customer configuration used Service Center 800 535 5560 The ABS configuration is defined by the number of wheel end sensors and modulator valves There are three common ABS configurations used with D version ECUs Figure 1 4 000 00 00 000000 e 45 4 4 wheel speed sensors 000 000 000 0 4 modulator valves Figure 1 5 asm we e 65 4 6 wheel speed sensors 4 modulator valves 65 6 6 wheel speed sensors 6 modulator valves 1002003a Manufacturing Information Part Number ECU Version ABS Configuration Figure 1 5 A B 1002004c A Air Lines 1 Wheel Speed Sensors 3 Relay Valve B Electrical Lines 2 ABS Modulator Valves 4 ECU 4S 4M Configuration
14. the United States should consult the regulations that apply to them for further guidance MM30 Page 1 MERITOR WABCO Section 1 Introduction Contents This manual contains service information for the Meritor WABCO Anti Lock Braking System ABS and ABS with Automatic Traction Control ATC for trucks tractors and buses Use this manual for D version cab and frame mounted and D Basic Electronic Control Units ECUs For diagnostic and testing procedures for systems with C version ECUs use Maintenance Manual 28 How ABS Works Meritor WABCO ABS is an electronic system that monitors and controls wheel speed during braking The system works with standard air brake systems ABS monitors wheel speeds at all times and controls braking during wheel lock situations The system improves vehicle stability and control by reducing wheel lock during braking The ECU receives and processes signals from the wheel speed sensors When the ECU detects a wheel lockup the unit activates the appropriate modulator valve and air pressure is controlled In the event of a malfunction in the system the ABS in the affected wheel s is disabled that wheel still has normal brakes The other wheels keep the ABS function An ABS indicator lamp lets drivers know the status of the system This lamp is also used to display blink code diagnostics Figure 1 1 The location of the ABS indicator lamp varies depending on the make and model
15. the blink code switch for at least three seconds then release If the system displays eight quick flashes followed by a system configuration code the clear was successful Stored ABS faults have been cleared from memory If you do not receive eight flashes there are still active faults that must be repaired before they can be cleared MM30 Page 15 Section 3 Troubleshooting amp Testing Blink Code Diagnostics Troubleshooting with Blink Code Diagnostics Step I Turn Ignition ON Step Press and hold Blink Code Switch for one second then release 7 2 lt a Step Ill Count the flashes to determine the blink code Step IV Turn Ignition OFF Repair and Record faults Step V Turn Ignition ON Clear Faults from memory Press and hold blink code switch for at least three seconds then release MM30 Page 16 Possible responses A ABS indicator lamp comes on momentarily then goes out indicating System O K ABS indicator lamp does not light indicating possible wiring fault or burned out bulb ABS indicator lamp stays on indicating Fault or faults in the system Sensor fault during last operation Faults cleared from ECU but vehicle not driven ECU disconnected ABS indicator lamp begins flashing two digit blink code s First Digit 1 8 flashes Pause 1 1 2 seconds Second Digit 1 6 flashes Pause 4 seconds Active Fault
16. ACTOR ABS ATC MENU SELECTIONS T STORED FAULTS Revised 04 01 MERITOR WABCO Section 3 Troubleshooting amp Testing Press ENTER to display stored faults Pro Link displays number blink code number of occurrences and written description of stored faults 1 1 2 3 REAR ABS VALVE OPEN OR CABLE DAMAGE 4 Press FUNC The following screen will appear CLEAR ALL STORED FAULT S CLEAR Y Use arrow key to move to Y yes to clear all stored faults at once CLEARING STORED FAULT S When faults are cleared Pro Link screen will prompt you to continue STORED FAULT S CLEARED ENTER TO CONTINUE Press ENTER to return to ABS ATC menu Component Test Screens These screens help you test ABS components Select this function from the Tractor ABS ATC menu TRACTOR COMP TESTS SELECTIONS T VEHICLE VOLTAGES Revised 04 01 ABS VALVES ATC ABS INDICATOR LAMP ATC INDICATOR LAMP ABS ATC SWITCHES SENSORS ENGINE DATALINK RETARDER RELAY RETARDER DATALINK Select the appropriate function Each screen has instructions to guide you through the test Refer to the Pro Link Manual for complete instructions System Information With some ECUs the Pro Link will display system information components or options supported by the ECU Access these screens through System Setup main ABS menu The following screens illustrate A 4S 4M ABS
17. ATC system Where the ECU has not recognized a retarder relay Where the ECU has recognized a J1922 or J1939 datalink The ECU is capable of supporting ABS and switches these may not be installed on the vehicle TRACTOR ABS ATC SYSTEM INFORMATION SENSORS MODULATORS ATC VALVE YES RETARDER RELAY NO J1922 YES J1939 NO DIFF LOCK NO ABS SWITCH YES ATC SWITCH YES NOTE Yes indicates the ECU is capable of supporting these options These may or may not be installed on the vehicle MM30 Page 27 Section 3 Troubleshooting amp Testing MERITOR WABCO The following definitions explain the function of each test Component Test Vehicle Monitors the voltage signals powering the Voltages ECU ABS Valves Cycles the valves one at a time With brake pedal applied you should hear four short air exhausts then one long air pressure hold A menu selection lets you choose from four or six valves This test is used to verify valve locations and proper wiring NOTE The treadle must be applied to pressurize the brake chambers ATC Checks the ATC valve You will hear a click as the valve cycles NOTE The Pro Link may be used to shut off ATC for dynamometer testing ABS Lamp Monitors the commanded on off states of the ABS lamp Follow the screen prompts 1 On 2 Off to change the status of the lamp on the instrument panel ATC Lamp Monitors the commanded on off stat
18. CKAGE INSTALLATION REAR LAMPS UP TO THREE ABS TRAILER ABS ATC 1003364f Revised 04 01 AIR LINES ELEC LINES LAMPS UP TO THREE ABS TRAILER ABS ATC VALVE PACKAGE INSTALLATION FRONT VALVE PACKAGE INSTALLATION REAR LAMPS UP TO THREE ABS TRAILER ABS ATC 1003365f MM30 Page 39 Appendix System Configuration Layouts D Version 4S 4M ABS ATC A B AIR LINES ELEC LINES VALVE PACKAGE INSTALLATION FRONT VALVE PACKAGE INSTALLATION REAR 1003366g D Version 65 4 ABS ATC AIR LINES ELEC LINES VALVE PACKAGE INSTALLATION FRONT VALVE PACKAGE INSTALLATION REAR 1003367g MM30 Page 40 MERITOR WABCO AIR LINES ELEC LINES LAMPS UP TO THREE ABS TRAILER ABS VALVE PACKAGE INSTALLATION FRONT VALVE PACKAGE INSTALLATION REAR LAMPS UP TO THREE ABS TRAILER ABS ATC 1003368f Revised 04 01 Appendix Il MERITOR WABCO Wiring Diagrams e D Basic ECU Cab Mounted e D Version Cab Mounted ABS ATC ECU e D Version Frame Mounted ABS ATC ECU MM30 Revised 04 01 Page 41 MERITOR WABCO Appendix Il Wiring Diagrams D Basic ECU All D Basic ECUs Are Cab Mounted MWOSN3S uv3H 1H9IM YOSN3S A1NOM 1331 MOSN3S 1331 MOSN3S ANGUS Sav uv3d LHOTY g ama sev avaa 1331 7 sav 1NONJ 1331 sgy 1NOMA LHOTY LNAINdINOA TWNOILdO HOLIMS AYVLNAINOIN YOLISNNOD N
19. Clear Faults button at the bottom of the screen 4 From the ABS Main Screen select the Faults to clear the fault Use the Update button to icon or use the pull down menu to display the refresh the fault information table and display faults from the ECU Figure 3 5 the new list of faults NOTE If there are Faults in the system YES in existing or stores fields double click on the YES to display Fault Information MM30 Page 14 Revised 04 01 MERITOR WABCO Section 3 Troubleshooting amp Testing Blink Code Diagnostics Definitions Before using blink code diagnostics you should be familiar with a few basic terms If you used previous versions of Meritor WABCO s blink code diagnostics review these definitions to identify major changes ABS Indicator Lamp This lamp serves two purposes it alerts drivers to an ABS fault and it is used during diagnostics to display the blink code Blink Code A series of blinks or flashes that describe a particular ABS system fault or condition Blink Code Cycle Two sets of flashes with each set separated by a one and one half second pause Blink codes are defined in Blink Code Identification in this section Blink Code Switch A momentary switch that activates blink code diagnostic capabilities Switch types and locations vary depending on the make and model of the vehicle Clear The process of erasing faults from the ECU Diagnostics The process of using blink codes to dete
20. Id 81 YOLOANNOD 40 MIIA si TON 1 uoswas 1 71 o 11 aosnas B aasn n ON l3NI 3A0VA 13uno 137NI 30 Revised 04 01 Page 42 lagrams Appendix Il D 1VNOLLdO HOLIMS ABVIN3UOIN L iring W 30 Jova 1 BODO WNIT SNINNVM Sev NOI el Cv cegir 11 8 4691 01 NOI 2261 9 22617 I MERITOR WABCO 30 Page 43 Revised 04 01 MERITOR WABCO 1002048b GIONS 10s 13I 8 137NI 4 Iuno sav ge e xe ros n LHOTS 13uno 4 GIONIS 13uno 035 10N NOSN3S s MOSN3S 1N08J HOTS MIVd O31SIAL O3sn LON G3sn LON 5 LON NNOJ 6 5 LON 1351 OION370S 13WI A37NI JAVA 88 1NOS 1431 ano ONO 1311 0 NNO2 9 OL poe ae las el RT 4 HOLINS Y 2 yog 99 M3Quv133 01 JO WOVE E dev ONINGVA SEV QE Que env 21v NOI 08In v aesir E 8 48917 8 691
21. L ONLY RESPIRATORS AND PROTECTIVE CLOTHING ARE REQUIRED IN THIS AREA 2 Respiratory Protection Wear a respirator equipped with a high efficiency HEPA filter approved by NIOSH or MSHA for use with asbestos at all times when servicing brakes beginning with the removal of the wheels 3 Procedures for Servicing Brakes a Enclose the brake assembly within a negative pressure enclosure The enclosure should be equipped with a HEPA vacuum and worker arm sleeves With the enclosure in place use the HEPA vacuum to loosen and vacuum residue from the brake parts b alternative procedure use a catch basin with water and a biodegradable non phosphate water based detergent to wash the brake drum or rotor and other brake parts The solution should be applied with low pressure to prevent dust from becoming airborne Allow the solution to flow between the brake drum and the brake support or the brake rotor and caliper The wheel hub and brake assembly components should be thoroughly wetted to suppress dust before the brake shoes or brake pads are removed Wipe the brake parts clean with a cloth c lfanenclosed vacuum system or brake washing equipment is not available employers may adopt their own written procedures for servicing brakes provided thatthe exposure levels associated with the employer s procedures do not exceed the levels associated with the enclosed vacuum system or brake washing equipment Consult OSHA regulations for more de
22. MERITOR WABCO Anti Lock Braking System ABS for Trucks Tractors and Buses Maintenance Manual 30 Revised 04 01 e For D Version ECUs Service Notes MERITOR WABCO Before You Begin This manual provides correct service and repair procedures for Meritor WABCO s anti lock braking system for trucks tractors and buses Before you begin procedures 1 Read and understand all instructions and procedures before you begin to service components 2 Read and observe all Caution and Warning safety alerts that precede instructions or procedures you will perform These alerts help to avoid damage to components serious personal injury or both 3 Follow your company s maintenance and service installation and diagnostics guidelines 4 Use special tools when required to help avoid serious personal injury and damage to components Safety Alerts Torque Symbol and Notes A Warning alerts you to an A WARNING instruction or procedure that you must follow exactly to avoid serious personal injury and damage to components A Caution alerts you to an A CAUTION instruction or procedure that you must follow exactly to avoid damage to components and possible serious injury o Atorque symbol alerts you to tighten fasteners to a specified torque value NOTE A Note provides information or suggestions that help you correctly service a component Access Information on ArvinMeritor s Web Site Additional m
23. Modulator Valve ATC Valve Table of Contents MERITOR WABCO Section 4 Component Replacement Component Removal and Installation 5 31 Valves Sensor Lube Specification Sensors 33 ABS Modulator Valve ATE Valve 2 ee ES ESCUCHA CENE QM Tk RENE ES EE 34 Front or Rear ABS Valve Package 35 Valve the Rear ABS Valve Package 36 Appendix System Configuration Layouts 39 Appendix Il Wiring Diagrams 41 Appendix Ill Additional ABS Information Troubleshooting Guide Meritor WABCO ABS Valve Package 48 Reconfiguration Procedure 0 4 49 How to Reconfigure an ECU D Version MERITOR WABCO Asbestos and Non Asbestos Fibers A ASBESTOS FIBERS WARNING The following procedures for servicing brakes are recommended to reduce exposure to asbestos fiber dust a cancer and lung disease hazard Material Safety Data Sheets are available from ArvinMeritor Hazard Summary Because some brake linings contain asbestos workers who service brakes must understand the potential hazards of asbestos a
24. OO SI n BAVA 21V 21v 3AWA 21V GTONS70s sav 1331 GN OION3 0S 1311 0 MERITOR WABCO 1002049b 30 45 Revised 04 01 Appendix Il Wiring Diagrams MERITOR WABCO D Version Frame Mounted ABS ATC ECU C SENSOR LF Cam SENSOR RF X2 BLACK GRAY ATC SWITCH OPTIONAL 3 41587 8 41687 RETARDER 30 8 EF DIAGNOSTIC RETARDER 41922 OR 41939 BUT NOT BOTH NOT usep 121939 b 91922 A 7 939 4 RETARDER 87 MM30 Page 46 Revised 04 01 MERITOR WABCO g Diagrams Revised 04 01 TP X3 GREEN X4 BROWN TP Wirin ABS VALVE RIGHT SRD 6S 6M ONLY ABS VAL VE LEFT SRD 65 6 ONLY OPTIONAL EQUIPMENT TWISTED PAIR Appendix Il MM30 Page 47 Appendix Ill Additional ABS Information MERITOR WABCO Troubleshooting Guide Meritor WABCO ABS Valve Package This Troubleshooting Guide is a reference tool to help identify possible malfunctions of the ABS modulator or relay valves It does not take the place of diagnostic tests or other service instructions ABS Valve Package Troubleshooting Guide Condition Possible Cause Air constantly leaks from exhaust port Internal relay valve problem Replace the relay valve of relay valve Air leaks from exhaust port of ABS Park
25. Valve Package Figure 4 6 Rear ABS Valve Package Figure 4 5 1003362a Supply Port 1 2 NPT Quick Release Valve 1 2 NPT Delivery Ports Modulator Valve Revised 04 01 1003361a ABS Modulator Valve Relay Valve Control Port 1 4 NPT ABS Modulator Valve Delivery Ports 1 2 NPT Supply Port 1 2 NPT Delivery Ports 3 8 NPT A WARNING Park the vehicle on a level surface Block the wheels to prevent the vehicle from moving Support the vehicle with safety stands Do not work under a vehicle supported only by jacks Jacks can slip and fall over Serious personal injury can result 1 Put blocks under tires to stop the vehicle from moving If necessary raise the tires off the ground Drain air from all system air tanks Remove all air lines and connections from ABS valve package 5 Remove mounting bolts from the valve package remove the valve package from vehicle 6 Replace the ABS valve package Tighten bolts to OE recommendation Remove blocks and safety stands as necessary 7 Test the installation Refer to page 38 MM30 Page 35 Section 4 Component Replacement MERITOR WABCO Removal and Replacement Component Valves Refer to Figure 4 7 1 Remove ABS valve package from vehicle 2 Usea 6 mm Allen wrench to loosen and remove the Allen head bolts Figure 4 7 1002041c 1 Allen Head Bolts 2 13 15 lb ft 18 20 Nem Q 3 Carefully separate ABS modulator valve s from th
26. a Switch and lamp locations will vary depending on the vehicle make and model Here s how the Deep Snow and Mud feature works System Driver Action Response Press deep snow ATC lamp blinks and mud switch continuously Press switch ATC lamp stops again blinking NOTE Turning off the ignition will also deactivate the deep snow and mud feature MM30 Page 12 ATC Components ATC may be used with individual ABS modulator valves or installed with the ABS Valve Package When installed with individual ABS modulator valves an ATC solenoid valve is mounted on the frame or cross member near the rear of the vehicle When it is part of the ABS valve package an ATC valve is attached to the relay valve A cable connects the ECU to the ATC valve ATC components are illustrated in Figure 2 5 Figure 2 5 1002019a ATC Valve ABS ATC Valve Package Cable Revised 04 01 MERITOR WABCO Section 3 Troubleshooting amp Testing General Maintenance Information There is no regularly scheduled maintenance required for the Meritor WABCO ABS or ABS ATC However ABS does not change current vehicle maintenance requirements LAMP CHECK To make sure the ABS lamp is operating drivers should check the lamp every time the vehicle is started When the vehicle is started the ABS lamp should come on momentarily If it does not come on it could mean a burned out bulb System Diagnostics e TOOLBOX Softwa
27. ains description of the fault Repair instructions for Tractor ABS each fault appear at the bottom of the screen Trait ABS Figure 3 6 Hydraulic ABS ECAS Electronic Figure 3 6 Figure 3 4 FAULT NAME TIMES n A VE 1 18 2 ACTIV 1 13 27 Meritor WABCO ABS Tractor ECU Display Component Tests Help ECU Information ECU Type Configuration 0 Part Number 384905244 Right Front Manufacture Date 9200 Left 2nd Serial Number 22 Right 2nd Software Rev ms Left Engine Data Link Right 3rd Faults Learned Components None Existing None Stored Retarder Relay Data Link Repair Instructions Retarder oulput connected bad Load was once detected Oi SAE engine message missing bul was once received zl Update Fault Fin Savo ABS or Diagonal ms NOTE Faults that occur after the screen is Control Status Switches Voltages ABS Brake ABS Retarder rz WE N A Dieoonsle displayed will not appear until a screen update ATC Broke sss lone crc ne 1130 is requested Use the Update button at the ATC Engine 5 bottom of the screen to refresh the fault information table Disabled 3 6 00 6 After making the necessary repairs use the
28. aintenance and service information for ArvinMeritor s commercial vehicle systems component lineup is also available at www arvinmeritor com To access information click on Products amp Services Tech Library Icon HVS Publications The screen will display an index of publications by type Additional Information Call ArvinMeritor s Customer Service Center at 800 535 5560 to order the following item e Drivetrain Plus by ArvinMeritor Technical Electronic Library on CD Features product and service information on most Meritor ZF Meritor and Meritor WABCO products 20 Order TP 9853 IMERITOR WABCO Table of Contents Asbestos and Non Asbestos Fibers 1 Section 1 Introduction Ss ek d de ex a S AT SR parse Doa tergo e e 3 How ABS Works ECU Identification ABS Configuration like RAD Re Xu LRL ERE YE Ra ARR E ee 4 ABS Indicator Lamp eire ee ERI OE CLE OSEE ERR OR eet 5 ABS Modulator Valves Valve Arrangement Option ABS Valve Packages 2 55 RU rA baka Rives aad e a 6 ABS S NSOlS aac Uia a wa e Ram e epos ce ruta 7 Automatic Traction Control Off Road ABS System Component 1 ilg cam CARCER AA x S CC GC C m CR 8 Section 2 Automatic Traction Control ATC
29. ashes will be followed by the system configuration code A 45 4 2 blinks system is identified here Continues During Test System ID System ID ill The system configuration code wi o continue during the entire test 2 Activate the J1922 or J1939 engine torque reduction code as follows A Step on the accelerator Bring the engine to 1000 RPM Leave your foot on the accelerator during the entire test B While engine is at 1000 RPM press the blink code switch twice as follows Press for one second Release for one second TORUM Press for one second Release for one second C The engine will go to idle for approximately 10 seconds and then return to 1000 RPM 3 Turn ignition OFF Test complete engine torque reduction command verified MM30 Revised 04 01 Page 21 Section 3 Troubleshooting amp Testing MERITOR WABCO Component Tests and Functions TOOLBOX Software NOTE Refer to page 22 of this manual for instructions for running TOOLBOX Software or refer to the Software Owner s Manual TP 99102 for complete instructions Use TOOLBOX Software to display wheel speeds cycle ABS valves activate ABS and ATC lamps including the trailer ABS lamp and turn the retarder relay on or off In addition the J1939 engine datalink connection may be quickly verified by using TOOLBOX Software Wheel Speed Select the wheel speed icon or use the pull down menu from the ABS Main S
30. atory Guidance References to OSHA NIOSH MSHA and EPA which are regulatory agencies in the United States are made to provide further guidance to employers and workers employed within the United States Employers and workers employed outside of the United States should consult the regulations that apply to them for further guidance Revised 04 01 A NON ASBESTOS FIBERS WARNING The following procedures for servicing brakes are recommended to reduce exposure to non asbestos fiber dust a cancer and lung disease hazard Material Safety Data Sheets are available from ArvinMeritor Hazard Summary Most recently manufactured brake linings do not contain asbestos fibers These brake linings may contain one or more of a variety of ingredients including glass fibers mineral wool aramid fibers ceramic fibers and silica that can present health risks if inhaled Scientists disagree on the extent of the risks from exposure to these substances Nonetheless exposure to silica dust can cause silicosis a non cancerous lung disease Silicosis gradually reduces lung capacity and efficiency and can result in serious breathing difficulty Some scientists believe other types of non asbestos fibers when inhaled can cause similar diseases of the lung In addition silica dust and ceramic fiber dust are known to the State of California to cause lung cancer U S and international agencies have also determined that dust from mineral wool ceramic fibers and
31. cation was in effect at the time the publication was approved for printing and is subject to change without notice or liability Meritor WABCO reserves the right to revise the information presented or to discontinue the production of parts described at any time Copyright 2001 Maintenance Manual 30 ArvinMeritor Inc Revised 04 01 All Rights Reserved Printed in USA 16579 22882
32. creen to display wheel speed data in both numeric and graphical form This data may be shown in RPM or MPH format Figure 3 9 and in vertical or horizontal graphs Figure 3 10 and Figure 3 11 Select the appearance and style from the options menu Figure 3 9 Optio ee Look MM30 Page 22 Figure 3 10 Wheel Speed Bar Graph Figure 3 11 Wheel Speed Bar Graph Revised 04 01 MERITOR WABCO Section 3 Troubleshooting amp Testing Valve Activation Select the valve icon or use the pull down menu to select and cycle individual ABS valves Then listen to ensure the correct valve is cycling This is helpful when verifying proper operation installation and wiring Figure 3 12 Figure 3 12 ey Valve Activation Valve Selection Left Front Right f AIC 4 3 C Left 2nd Ade C Right ind Ade PAETOS DE 27 6 5 C AIABS Valves Holding the Lell Front ABS Velve Frezsuie Send Close Lamp Activation Select the lamp icon or use the pull down menu to turn the tractor and trailer ABS and or the ATC wheel spin lamps on or off This is helpful when verifying proper operation installation and wiring of the lamps to the ECU Figure 3 13 Figure 3 13 Z Meritor WABCO ABS TractorECU Display Component Help ee ECU Information
33. e 28 and Blink Code Diagnostics page 16 ystem Verify accuracy of blink code and clear from ECU memory If code does not clear it may be necessary to replace the ECU 8 Full function cab mounted only Refer to wiring diagram in Check all ABS valve ground connections for diagonals 1 and 2 open shorted to Appendix II ground or shorted to battery fthis code continues after all repairs have been made or if you receive a code for a component that is not installed on the vehicle it may be necessary to reconfigure the ECU Contact ArvinMeritor s Customer Service Center at 800 535 5560 for reconfiguration information MM30 Page 20 Revised 04 01 t Section 3 MERTTOR WABCO Troubleshooting amp Testing J1922 or J1939 Datalink Verification The Pro Link diagnostic tool provides the easiest way to verify the J1922 or J1939 datalink connection If you do not have a Pro Link you can use the blink code switch to verify this connection 1 Turn ignition ON Press blink code switch 2 hold for 3 seconds IGNITION ON 3 Second Hold A ATC indicator lamp will come on and stay on for the entire test If vehicle is not equipped with ATC the ATC indicator lamp will not come on ABS indicator lamp will come on and blink 8 times If the lamp does not blink 8 times there are faults that must be cleared before you 8 Quick Blinks Faults Cleared continue with this test The eight quick fl
34. e off the ground Put safety stands under the axle 4 Relieve line pressure by bleeding the air from the appropriate supply tank 5 Disconnect the wiring from the ATC valve 6 Disconnect the air lines from Port 1 air supply Port 2 air discharge and Port 3 treadle of the ATC valve Figure 4 4 MM30 Page 34 Figure 4 4 1002039a Air Lines Port 1 Air Supply Air Line Port 3 Treadle Valve Control Do Not Open Port 2 Air Discharge 7 Remove the two mounting capscrews and nuts Remove the ATC valve Installation 1 Install the ATC valve with two mounting capscrews and nuts Tighten the capscrews per the manufacturer s recommendation 2 Connect the air supply discharge and treadle lines to Ports 1 2 and 3 of the ATC valve 3 Connect the harness connector to the ATC valve Hand tighten only 4 Remove blocks and stands Test the installation Refer to the following Revised 04 01 MERITOR WABCO Section 4 Component Replacement Checking the Installation To test the ATC valve 1 Start vehicle 2 Fully charge reservoirs with air Shut off vehicle Apply brakes Listen for air leaks at ATC valve Release brakes Activate ATC valve using the MPSI tool Disconnect MPSI tool Drive the vehicle Verify that the ATC indicator lamp operates properly Front or Rear ABS Valve Package Removal and Replacement Complete Package Figure 4 5 Front ABS
35. e relay or quick release valve 4 Remove and discard old O rings Lubricate replacement O rings with grease provided 5 Plug any unused ports on the replacement valve s 6 Attach ABS modulator valve s to the relay valve Torque the Allen head bolts to 13 15 Ib ft 18 20 Nem o 7 Replace the ABS valve package Tighten bolts to OE recommendation Remove blocks and safety stands as necessary MM30 Page 36 8 Checkthe valves for leaks Modulator valve s Refer to page 31 e Relay or quick release valve Refer to page 34 ATC Valve on the Rear ABS Valve Package Removal NOTE If there is enough room to work it is not necessary to remove the valve package from the vehicle before replacing the ATC valve If the valve package must be removed follow the instructions for removing and replacing the ABS Valve Package that appear in this section of the manual When installing the new ATC valve on the valve package you must use the new O rings seals mounting bolts and lubricant included with the replacement kit 1 Turn ignition switch to the OFF position apply parking brake WARNING Park the vehicle on a level surface Block the wheels to prevent the vehicle from moving Support the vehicle with safety stands Do not work under a vehicle supported only by jacks Jacks can slip and fall over Serious personal injury can result 2 Put blocks under the front and rear tires to stop the vehicle from movi
36. em Components Figure 1 8 1002008a Cab Mounted ECU Frame Mounted ECU D Basic ECU Figure 1 10 1002010b 1 Air In Port 1 2 AirOut Port 2 MM30 Page 8 The ECU is the brain of the ABS system It receives information from the sensors and sends signals to the ABS valves ECUs are available for cab or frame mounted applications D Basic is a cab mounted ECU Figure 1 8 A tooth wheel A is mounted at or cast in the hub of each sensed wheel with a sensor B installed so that its end is against the tooth wheel A sensor clip C holds the sensor in place at the tooth wheel Figure 1 9 NOTE The sensor and clip must be greased with Meritor WABCO recommended lubricant Refer to Sensor Lube Specification in Section 4 for lube specification An ABS modulator valve controls air pressure to each affected brake during an ABS event Figure 1 10 The modulator valve is usually located on a frame rail or cross member near the brake chamber Revised 04 01 MERITOR WABCO Figure 1 11 Figure 1 13 Figure 1 14 Revised 04 01 Section 1 Introduction The ABS valve package is an alternative to individual valves The rear ABS valve package combines two modulator valves and one service relay valve Figure 1 11 The front ABS valve package combines two modulator valves and a quick release valve Figure 1 12 1003359a Sensor cables connect the sensor to the ECU Figure 1 13 ABS modulato
37. entify faults stored in the ECU memory Stored faults may be existing faults that have been repaired or faults that existed for a short time then corrected themselves After displaying the stored faults the Pro Link lets you erase them from memory All stored faults are cleared at one time Revised 04 01 Pro Link Display Depending upon the ECU being tested the Pro Link screen will display certain options or components only when recognized by the ECU These include ATC ATC Indicator Lamps ATC Valve Engine Datalink Retarder Relay Retarder Datalink Using the Pro Link The following illustrates a typical fault screen sequence 45 4 ABS ATC system e Where the ECU detected an SAE J1922 Datalink e With one stored fault TRACTOR 45 4 DATA LINK J1922 EXISTING FAULT YES STORED FAULTS YES With some ECUs this line will not appear Press Arrow Down Key DATA LINK EXISTING FAULT STORED FAULTS FUNC FOR MENU Press FUNC to display menu Select Existing Fault to display active fault TRACTOR ABS ATC MENU SELECTIONS T EXISTING FAULT MM30 Page 25 Section 3 Troubleshooting amp Testing MERITOR WABCO Press ENTER to select The following screen appears The first line displays the number of existing faults 1 of 1 the blink code 2 3 and the number of times the fault occurred 1 time Lines two and three provide a written description of the fault
38. es of the ATC lamp Follow the screen prompts 1 On 2 Off to change the status of the lamp on the instrument panel ABS ATC Checks the status of ABS and ATC Deep Switches Snow and Mud switches on the instrument panel Sensors Monitors the input to the ECU from the wheel Vehicle must be stationary and wheels must be rotated during this test Engine Checks wiring connections and response Datalink between the engine and the ECU Retarder Activates the relay to verify function a click Relay will be heard This test also checks wiring connections Retarder Datalink Checks wiring connections and retarder response between the retarder and the ECU MM30 Page 28 Tire Size Range For proper ABS ATC operation with the standard ECU front and rear tire sizes must be within 14 of each other When this tire size range is exceeded without electronically modifying the ECU the system performance can be affected and the indicator lamp can illuminate Call Meritor WABCO at 800 535 5560 if you plan a tire size difference greater than 1496 Calculate the tire size with the following equation 96 Difference REM steer Steer _ 1 RPM Drive x 100 RPM tire revolutions per mile Testing Components A CAUTION When troubleshooting and testing the ABS system do not damage the connector terminals Voltage Check Measure voltage at the pins indicated in Table A e Voltage must be between 9 5 and 14 volts for a 12 v
39. found on certain vehicle models The ABS valve package may be used on all D version units including D Basic and is available for front or rear axle installation Easy Listening Tip To make sure the ABS valves are working just listen Refer to Figure 1 6 1 Apply the brakes 2 Turn on the ignition 3 Wait for the ABS indicator lamp to come on 4 Listen to the valves cycle one by one then together diagonally as follows 4 Channel Valve Cycle Order 1 2 3 4 then 1 amp 2 3 amp 4 1002006c 6 Channel Valve Cycle Order 1 2 3 4 5 6 4 Channel 1 Cab then 1 2 amp 3 4 5 amp 6 6 Channel 2 Curbside MM30 Revised 04 01 Page 5 Section 1 Introduction MERITOR WABCO ABS Valve Packages The front ABS valve package combines a quick release valve with two ABS modulator valves and is mounted in the front of the vehicle The rear ABS valve package combines a service brake relay valve with two ABS modulator valves and is mounted in the rear of the vehicle The valve package front or rear must be mounted near the brake chambers it serves Figure 1 7 Figure 1 7 1002007e A Air Lines B Electrical Lines 1 Rear ABS Valve Package 2 Wheel Speed Sensors 3 Front ABS Valve Package 4 ECU 45 4 Configuration MM30 Page 6 Revised 04 01 Section 1 IMERITOR WABCO Introduction ABS Sensors ABS sensor systems consist of a tooth wheel mounted on the hub of each monito
40. four quick flashes followed by a continuous display of the system configuration code NOTE System configuration code continues until ignition is turned OFF Stored faults cleared no active faults present Continue with reconfiguration NOTE The reconfiguration procedure can not be conducted if there are active faults present These must be repaired before proceeding with the reconfiguration A complete ATC system including an ATC lamp is installed If not the ATC lamp will not come on ECU reconfiguring the system The ECU checks the following components and reprograms itself based on the new system e ATC valve AND OR Retarder relay AND OR e Datalink SAE J1922 or J1939 Successfully reconfigured MM30 Page 49 Appendix Ill Additional ABS Information MERITOR WABCO A system reconfiguration is illustrated below IGNITION ON 3 Second Hold SWITCH ATC Reset Continues Confirmation until power is turned off System ID System ID System ID System ID System ID System ID 2 2 2 2 2 2 ATC Lamp Dyno Function remains lit for entire test Light ON ATC Lamp will light only if ATC is connected 100337 1a MM30 Page 50 Revised 04 01 MERITOR WABCO Meritor WABCO Vehicle Control Systems 2135 West Maple Road Troy MI 48084 7121 USA 800 535 5560 meritorwabco com DRIVETRAIN PLUS THE COMPLETE SYSTEM ArvinMeritor Information contained in this publi
41. g or a vacuum not equipped with a HEPA filter when cleaning brake parts or assemblies NEVER use carcinogenic solvents flammable solvents or solvents that can damage brake components as wetting agents 4 Cleaning Work Areas Clean work areas with a vacuum equipped with a HEPA filter or by wet wiping NEVER use compressed air or dry sweeping to clean work areas When you empty vacuum cleaners and handle used rags wear a respirator equipped with a HEPA filter approved by NIOSH or MSHA if the exposure levels may exceed OSHA or manufacturers recommended maximum levels When you replace a HEPA filter wet the filter with a fine mist of water and dispose of the used filter with care 5 Worker Clean Up After servicing brakes wash your hands before you eat drink or smoke Shower after work Do not wear work clothes home Use a vacuum equipped with a HEPA filter to vacuum work clothes after they are worn Launder them separately Do not shake or use compressed air to remove dust from work clothes 6 Waste Disposal Dispose of discarded linings used rags cloths and HEPA filters with care such as in sealed plastic bags Consult applicable EPA state and local regulations on waste disposal Regulatory Guidance References to OSHA NIOSH MSHA and EPA which are regulatory agencies in the United States are made to provide further guidance to employers and workers employed within the United States Employers and workers employed outside of
42. ing brake problem Service appropriate component modulator valve or relay valve when or parking brake is released Refer to manufacturer s service manual for Anti compound 2 way check valve instructions problem Rear service brakes releasing slowly Kinked air line Inspect repair lines brakes brakes dragging Dirt buildup inside relay valve If condition is not corrected Replace relay valve Valves don t cycle at power up Broken wire Check wires and connections or or Make repairs as needed Indicator lamp comes on blink code or Loose or broken terminal diagnostic tool indicates electrical connection problem with ABS valve Corroded connector pins or If condition is not corrected Problem with solenoid e Measure resistance across each valve solenoid coil terminal and ground on the ABS modulator valve to ensure 4 0 to 9 0 ohms f greater than 9 0 ohms replace ABS modulator valve If cleaning does not solve problem replace the ABS modulator valve If less than 4 0 ohms replace ABS modulator valve Ground Terminal Exhaust Solenoid blue wire Inlet Solenoid brown wire ABS valve package damaged Road Hazards Replace complete ABS valve package or individual component as required or Vehicle Damage MM30 Page 48 Revised 04 01 Appendix MERITOR WABCO Additional ABS Information Once these components have been memorized the ECU will look for them
43. ire Size Range Check sensor sensor cable and connector for intermittent contact page 28 6 1 Check for damaged tooth wheel Repair or replace as needed 6 2 6 5 6 7 1 Check for proper data link connection J1922 and J1939 Refer to wiring diagram in Verify wheel spin on each axle Appendix Il 3 6 6 7 2 Check ATC Valve valve cables and connectors Refer to Valve Tests page 30 Verify 7 to 14 ohms resistance for a 12 volt system 28 49 ohms resistance for a 1 2 3 5 24 volt system Check retarder third brake connections Refer to wiring diagram in m Appendix 7 4 Check ABS indicator light connections Verify blink code switch was activated longer than 16 seconds Verify proper ATC set up Verify engine datalink connection 7 6 Verify accuracy of blink code and clear from ECU memory Refer to Blink Code Diagnostics page 16 Check for low voltage Refer to wiring diagram in Appendix and Voltage Check Check vehicle voltage fuse and supply to ECU 9 5 14 volts page 28 Verify accuracy of blink code and clear from ECU memory Refer to Blink Code Diagnostics and Clear Mode page 15 Verify all ECU connectors are in place Contact ArvinMeritor s Customer Verify accuracy of blink code and clear from ECU memory Service Center at 800 535 5560 8 Check for high voltage Refer to Voltage Check Check vehicle voltage 9 5 14 volts for a 12 volt system 18 30 volts for a 24 volt pag
44. k Code Conditions ABS indicator lamp does not come on at Loose or burned out bulb Check bulb ignition Check connections Make necessary repairs Voltage not within acceptable range Check connections 9 5 14 volts for a 12 volt system Measure voltage 18 30 volts for a 24 volt system 9 necessary repairs Can t use blink code diagnostics ABS Switch not held for proper length of time Repeat procedure hold switch for proper indicator lamp will not go off when blink code is activated 1 Second Diagnostics Mode length of time 3 Seconds Clear All Mode Improper or faulty wiring Inspect and repair wiring Eight Flashes not received after blink Active Faults still exist Identify active faults then make necessary code switch pressed for at least repairs three seconds then released Turn ignition OFF then repeat Blink Code Diagnostics MM30 Page 18 Revised 04 01 Section 3 MERITOR WABCO Troubleshooting amp Testing Blink Code Identification Use the following information to identify the blink code Blink Code Identification First Digit Type of Fault Second Digit Specific Location of Fault 2 ABS modulator valve Right front steer axle curb side 3 Too much sensor gap Left front steer axle driver s side 4 Sensor short or open Right rear drive axle curb side Sensor signal erratic Left rear drive axle driver s side 6 Tooth wheel Right rear additional axle cu
45. naruto a beat d m tede 11 Deep Snow and Mud Switch ATC Components Section 3 Troubleshooting amp Testing General Maintenance Information 13 System Diagnostics TOOLBOX Software Blink Code Diagnostles ee Y ROS 15 Diagnostic Mode Clear Mode Blink Code Diagnostics oan realy Pes ek eA ese De eee 16 Working with Blink Codes 18 Blink Code Troubleshooting and Repair 20 91922 J1939 Datalink Verification 21 Component Tests and Functions 22 TOOLBOX Software MPSI Pro sLink 9000 2 teen oe wie 24 Component Tests Diagnostic and Testing Procedure Pro LinkS6re rns cock Se AS T Eu oe Ra RE EE eal Sees 25 Using the Pro Link Tire Size Range ilis lk besiege Dim Ww edad Rie ead 28 Testing Components Voltage Check Location of Sensors Sensor Adj stment 2 22 6555 x e ES OR CAD a DR RR C 29 Sensor Output Voltage Test Sensor Resistance Dynamometer Testing Vehicles with ATC Valve Tests is e Ee Sie dae iad wee eh ede BNA ie ees ed ee 30 ABS
46. nd precautions for reducing risks Exposure to airborne asbestos dust can cause serious and possibly fatal diseases including asbestosis a chronic lung disease and cancer principally lung cancer and mesothelioma a cancer ofthe lining of the chest or abdominal cavities Some studies show that the risk of lung cancer among persons who smoke and who are exposed to asbestos is much greater than the risk for non smokers Symptoms of these diseases may not become apparent for 15 20 or more years after the first exposure to asbestos Accordingly workers must use caution to avoid creating and breathing dust when servicing brakes Specific recommended work practices for reducing exposure to asbestos dust follow Consult your employer for more details Recommended Work Practices 1 Separate Work Areas Whenever feasible service brakes in a separate area away from other operations to reduce risks to unprotected persons OSHA has set a maximum allowable level of exposure for asbestos of 0 1 f cc as an 8 hour time weighted average and 1 0 f cc averaged over a 30 minute period Scientists disagree however to what extent adherence to the maximum allowable exposure levels will eliminate the risk of disease that can result from inhaling asbestos dust OSHA requires that the following sign be posted at the entrance to areas where exposures exceed either of the maximum allowable levels DANGER ASBESTOS CANCER AND LUNG DISEASE HAZARD AUTHORIZED PERSONNE
47. ng 3 If necessary raise the vehicle off the ground Put safety stands under the axle 4 Relieve line pressure by bleeding the air from the appropriate supply tank 5 Disconnect the wiring from the ATC valve 6 Disconnect supply air line from the adapter and the treadle air line from the ATC valve Revised 04 01 Section 4 MERITOR WABCO Component Replacement 7 Use a5 Allen wrench to remove the two screws that hold the adapter piece to the relay valve portion of the valve package Use a 6 mm Allen wrench to remove the two mounting bolts that hold the ATC valve to the adapter piece Remove the ATC valve from the adapter piece Remove the ATC valve Remove the adapter piece seal and O rings from the valve package Figure 4 8 Figure 4 8 1002043a Mounting Bolts 12 13 Ib ft 18 20 Nem o ATC Valve Seal Adapter O Ring 2 Lubricate the replacement seal and install it in Port 2 of the ATC valve Lubricate the large replacement O ring and install it in the groove of the relay valve supply port Figure 4 10 1002042a Mounting Bolts ATC Valve Treadle Air Line NOTE Use Meritor WABCO recommended Seal lubricant O Rings Supply Air Line Adapter Figure 4 10 Installation 1 Clean and lubricate the small adapter piece O ring Install O ring on adapter piece Use the two new 8 Allen head bolts to attach the ATC valve to the adapter piece Use a 6 mm Allen head tool t
48. o tighten to 12 13 Ib ft 18 20 Nem Figure 4 9 o 1002044a 1 Relay Valve Supply Port MM30 Revised 04 01 Page 37 Section 4 Component Replacement MERITOR WABCO 3 Use the two M6 Allen head bolts to attach the adapter to the relay valve Use a 5 mm Allen head tool to tighten to 4 5 Ib ft 6 8 Nem Figure 4 11 o Figure 4 11 1002045a Supply Port ATC Valve and Adapter Control Port ABS Valve Package O Ring Installed Mounting Bolts 4 5 Ib ft 6 8 Nem o 4 Connect the supply air line to the supply port on the adapter Connect the treadle air line to the control port on the ATC valve 5 Attach the wiring connector to the valve Hand tighten only Remove blocks and stands Test the installation Refer to below Checking the Installation To test the valves 1 Start vehicle 2 Fully charge reservoirs with air Shut off vehicle Apply brakes Listen for air leaks at all valves Drive the vehicle Verify that the ABS indicator lamp operates properly MM30 Page 38 Revised 04 01 Appendix MERITOR WABCO System Configuration Layouts D Version 65 6 ABS AIR LINES ELEC LINES LAMPS UP TO THREE ABS TRAILER ABS ATC VALVE PACKAGE INSTALLATION FRONT VALVE PACKAGE INSTALLATION REAR LAMPS UP TO THREE ABS TRAILER ABS ATC 1003363f 65 4 ABS AIR LINES ELEC LINES LAMPS UP TO THREE ABS TRAILER ABS ATC VALVE PACKAGE INSTALLATION FRONT VALVE PA
49. olt system 18 and 30 for a 24 volt system The ignition must be turned ON for this test Table A Voltage Check Pins EU Cab Mounted 18 Pin 7 and 10 8 and 11 9 and 12 Basic 15 Pin 7and4 Frame Mounted X1 Grey 1 and 12 2 and 11 Location of Sensors On steering axles the sensor is accessible on the in board side of the steering knuckle On drive axles the drum assembly may have to be pulled to gain access to the sensor Revised 04 01 MERITOR WABCO Section 3 Troubleshooting amp Testing Sensor Adjustment e Push the sensor in until it contacts the tooth wheel e Do not pry or push sensors with sharp objects Sensors will self adjust during wheel rotation Sensor Output Voltage Test Voltage must be at least 0 2 volts AC at 30 rpm 1 Turn ignition OFF 2 Disconnect the appropriate connector from the ECU refer to wiring diagram 3 Rotate wheel by hand at 30 rpm 1 2 revolution per second 4 Measure voltage at the pins indicated in Table B e f the minimum output voltage is less than 0 2 push the sensor toward the tooth wheel then repeat the measurement Table B Sensor Check Pins ecu sese Connector Fins LF Cab Mounted RF LR RR LR 3rd Axle RR 3rd Axle 12 and 15 10 and 13 11 and 14 17 and 18 Frame Mounted LR 3rd Axle RR 3rd Axle Revised 04 01 X2 Black X2 Black X3 Green X3 Green X4
50. orque to provide improved traction ATC turns itself on and off drivers do not have to select this feature If drive wheels spin during acceleration the ATC indicator lamp comes on indicating ATC is active It goes out when the drive wheels stop spinning Figure 2 1 Wheels Stop Normal Vehicle Operation ATC Operational Spinning Excessive Wheel Spin ATC Lamp is Off ATC Lamp Comes On ATC Lamp Goes Out 1002015a If ATC is installed there will be an indicator lamp on the vehicle dash or instrument panel marked ATC ASR or Wheel Spin Some vehicles without ATC have a wheel speed lamp to show if drive wheels are spinning If the ATC lamp goes out before the ABS lamp there is no ATC An ATC installation may use an individually mounted valve or the valve may be part of the ABS valve package Figure 2 2 and Figure 2 3 Revised 04 01 Figure 2 2 100201Ra Individual ATC Valve 1002017b ABS ATC Valve Package MM30 Page 11 Section 2 Automatic Traction Control ATC MERITOR WABCO Deep Snow and Mud Switch A deep snow and mud option switch is included with ATC This function increases available traction on extra soft surfaces like snow mud or gravel by slightly increasing the permissible wheel spin Drivers use a deep snow and mud switch to select this feature When this function is in use the ATC indicator lamp blinks continuously Figure 2 4 Figure 2 4 1002018
51. r valve cables connect the modulator valve to the ECU Figure 1 14 MM30 Page 9 Section 1 Introduction MERITOR WABCO Figure 1 15 Available from SPX Kent Moore 800 328 6657 Figure 1 16 Includes Spanish and French Versions gt Easy Stop Trailer ABS Diagnostics gt Hydraulic ABS Diagnostics gt Pneumatic ABS Diagnostics D and E Versions MERITOR WABCO 1005521a Available from SPX Kent Moore 800 328 6657 MM30 Page 10 The MPSI Pro Link 9000 with Meritor WABCO cartridge provides diagnostic and testing capabilities for the ABS system Figure 1 15 TOOLBOX Software is a PC based diagnostics program that can display wheel speed data test individual components verify installation wiring and more Runs in Windows 95 98 and NT An RS232 to J1708 convertor box is required Versions 3 2 and higher support E version ABS Revised 04 01 MERITOR WABCO Section 2 Automatic Traction Control ATC ATC NOTE ATC is not available on D Basic systems Automatic Traction Control ATC is an option available on ABS equipped vehicles It helps improve traction when vehicles are on slippery surfaces by reducing drive wheel overspin ATC works automatically in two different ways 1 If a drive wheel starts to spin ATC applies air pressure to brake the wheel This transfers engine torque to the wheels with better traction 2 If all drive wheels spin ATC reduces engine t
52. rb side Left rear additional axle driver s side 7 System function J1922 or J1939 datalink ATC valve Retarder relay third brake ABS indicator lamp ATC configuration Reserved for future use Low power supply High power supply Internal fault System configuration error Ground Tandem lift tag or pusher axle depending upon the type of suspension f this code continues after all repairs have been made or if you receive code for a component that is not installed on the vehicle it may be necessary to reconthe ECU Contact ArvinMeritor s Customer Service Center at 800 535 5560 for reconfiguration information MM30 Revised 04 01 Page 19 Section 3 Troubleshooting amp Testing MERITOR WABCO Blink Code Troubleshooting and Repair Check ABS modulator valve valve cable and connectors Refer to Valve Tests page 30 12 volt system Verify 4 0 9 0 ohms resistance ABS modulator valve 24 volt system Verify 11 0 21 0 ohms resistance ABS modulater valve Adjust wheel sensor to touch tooth wheel Refer to Sensor Adjustment page 29 Sensor Output Voltage Test page 29 and Component Check for loose wheel bearings or excessive hub runout Tests page 24 Verify minimum 0 2 volts AC output 30 RPM Check sensor gap Check sensor sensor cable and connectors Repair or replace as needed Verify 900 2000 ohms resistance Check for tire size mismatch or tooth wheel difference Refer to T
53. re e Blink Code Diagnostics e Pro Link 9000 OEM Diagnostic Displays refer to Vehicle Operator s Manual TOOLBOX Software NOTE For complete instructions for using TOOLBOX Software refer to the User s Manual If you have TOOLBOX Software installed on your computer use it to identify system faults Then follow the on screen repair information to make the necessary repairs or replacements To display E version ABS faults 1 Connect the computer to the vehicle e Attach the cable from your computer to the J1708 to RS232 converter box e Attach the diagnostic cable Deutsch to the vehicle Figure 3 1 Revised 04 01 Figure 3 1 1005522a Serial Cable J1708 to RS232 Connector To Vehicle J1587 Connector Select TOOLBOX Software from Desktop or from the Windows Start Menu to display the TOOLBOX Main Menu Figure 3 2 Meritor WABCO PC Diagnostics System Setup Help MM30 Page 13 Section 3 Troubleshooting amp Testing MERITOR WABCO 3 From the Main Menu select Tractor ABS Diagnostics or use the pull down menu to make your selection Figure 3 3 The ABS Main Screen will appear Figure 3 4 Mentor WABCO ABS Tractor ECU Disky Component Tests Help Figure 3 5 Figure 3 3 2 Mentor WABCO PC Diagnostics TOOT Help Tractor ECU Component Tests Help 5 The Fault Information Screen cont
54. red wheel and a sensor installed so that its end is against the tooth wheel The sensor continuously sends wheel speed information to the ECU A sensor clip holds the sensor in place at the tooth wheel The type of axle determines sensor mounting location e Steering axle sensors are installed in the steering knuckle or in a bolted on bracket e Drive axle sensors are mounted in a block attached to the axle housing or in a bolted on bracket Automatic Traction Control Automatic Traction Control ATC is available as an option on ABS truck tractor and bus applications ATC can be used with individual valves or with an integrated ABS ATC valve package Section 2 describes ATC in detail Off Road ABS On some vehicles an off road ABS function may be selected This optional feature improves vehicle control and helps reduce stopping distances in off road conditions or on poor traction surfaces such as loose gravel sand and dirt NOTE On vehicles equipped with an off road switch the off road ABS mode is manually selected by the driver On some vehicles the off road mode may be fully automatic Refer to the vehicle specifications for information about the off road ABS feature The ABS indicator lamp on the dash will flash while the vehicle is in the off road mode This alerts the driver that the vehicle s normal ABS function is being modified MM30 Revised 04 01 Page 7 Section 1 Introduction MERITOR WABCO Syst
55. rmine ABS system faults Fault An ABS malfunction detected and stored in memory by the Meritor WABCO ECU System faults may be Active or Stored Active Fault A condition that currently exists in the ABS system for example a sensor circuit malfunction on the left front steering axle An active fault must be repaired before it can be cleared from memory and before you can display additional blink code faults Stored Fault There are two types of stored faults A A repaired active fault that has not been cleared from the ECU B A fault that occurred but no longer exists For example a loose wire that makes intermittent contact Because stored faults are not currently active they do not have to be repaired before they can be cleared from memory Meritor WABCO recommends you keep a record of these faults for future reference Revised 04 01 System Configuration Code One digit code displayed during the clear mode Blink codes for common ABS system configurations are shown in Figure 3 7 Figure 3 7 O es 6S 6M 6x2 65 6 exa OE e9 e 1002020 1 Number of Flashes 2 ABS Configuration Diagnostic Mode To enter the diagnostic mode press and hold the blink code switch for one second then release Clear Mode To erase faults from the ECU you must be in the clear mode To enter the clear mode press and hold
56. ront or Rear Modulator Valves Relay Valve or Quick Disconnect Valve ATC Valve Sensor Lube Specification Meritor WABCO specifications call for a sensor lubricant with the following characteristics Lube must be mineral oil based and contain molydisulfide It should have excellent anti corrosion and adhesion characteristics and be capable of continuous function in a temperature range of 40 to 300 F 40 to 150 C warninc To prevent serious eye injury always wear safe eye protection when you perform vehicle maintenance or service Release all air from the air systems before you remove any components Pressurized air can cause serious personal injury A CAUTION Use the following procedures to avoid damage to the electrical system and ABS ATC components When welding on an ABS or ABS ATC equipped vehicle is necessary disconnect the power connector from the ECU Revised 04 01 Sensors Wheel Speed Sensor Removal Front Axle To remove the sensor from the front axle A WARNING Park the vehicle on a level surface Block the wheels to prevent the vehicle from moving Support the vehicle with safety stands Do not work under a vehicle supported only by jacks Jacks can slip and fall over Serious personal injury can result 1 Put blocks under the rear tires to stop the vehicle from moving Apply the parking brake 2 fnecessary raise the front tires off the ground Put safety s
57. s well as the standard braking system Moisture in air lines can cause air lines to freeze in cold weather To install the ABS modulator valve 1 Install the ABS valve with two mounting capscrews and nuts Tighten the capscrews per the manufacturer s recommendation 2 Connect the line to the brake chambers to Port 2 of the ABS valve Connect the air supply line to Port 1 of the ABS valve 3 Connectthe wiring connector to the ABS valve Hand tighten only Remove the blocks and stands Test the installation Refer to the following procedures MM30 Page 33 Section 4 Component Replacement MERITOR WABCO Checking the Installation To test the modulator valve 1 Apply the brakes Listen for leaks at the modulator valve 2 Turn the ignition on and listen to the modulator valve cycle If the valve fails to cycle check the electrical cable connection Make repairs as needed 3 Drive the vehicle Verify that the ABS indicator lamp operates properly ATC Valve Removal 1 Turn ignition switch to the OFF position Apply parking brake A WARNING Park the vehicle on a level surface Block the wheels to prevent the vehicle from moving Support the vehicle with safety stands Do not work under a vehicle supported only by jacks Jacks can slip and fall over Serious personal injury can result 2 Put blocks under the front and rear tires to stop the vehicle from moving 3 If necessary raise the vehicl
58. silica are potential causes of cancer Accordingly workers must use caution to avoid creating and breathing dust when servicing brakes Specific recommended work practices for reducing exposure to non asbestos dust follow Consult your employer for more details Recommended Work Practices 1 Separate Work Areas Whenever feasible service brakes in a separate area away from other operations to reduce risks to unprotected persons 2 Respiratory Protection OSHA has set a maximum allowable level of exposure for silica of 0 1 mg m as an 8 hour time weighted average Some manufacturers of non asbestos brake linings recommend that exposures to other ingredients found in non asbestos brake linings be kept below 1 0 f cc as an 8 hour time weighted average Scientists disagree however to what extent adherence to these maximum allowable exposure levels will eliminate the risk of disease that can result from inhaling non asbestos dust Therefore wear respiratory protection at all times during brake servicing beginning with the removal of the wheels Wear a respirator equipped with a high efficiency HEPA filter approved by NIOSH or MSHA to minimize exposure Even when exposures are expected to be within the maximum allowable levels wearing such a respirator at all times during brake servicing will help minimize exposure 3 Procedures for Servicing Brakes a Enclose the brake assembly within a negative pressure enclosure The enclosure should
59. supported only by jacks Jacks can slip and fall over Serious personal injury can result 1 Put blocks under the front tires to stop the vehicle from moving 2 Raise the rear tire off the ground Put safety stands under the axle 3 Release the parking brake and back off the slack adjuster to release the brake shoes 4 Remove the wheel and tire assembly from the axle 5 Remove the brake drum Remove the sensor from the mounting block in the axle housing Use a twisting motion if necessary Do not pull on the cable 7 Remove the sensor spring clip from the mounting block MM30 Page 32 8 Disconnect the fasteners that hold the sensor cable and the hose clamp to other components 9 Disconnect the sensor cable from the chassis harness Wheel Speed Sensor Installation Rear Axle 1 Apply a Meritor WABCO recommended lubricant to the sensor spring clip and sensor 2 Install the sensor spring clip Make sure the spring clip tabs are on the inboard side of the vehicle 3 Push the sensor spring clip into the mounting block until it stops NOTE After installation there should be no gap between the sensor and the tooth wheel During normal operation a gap of up to 0 04 inch is allowable 4 Push the sensor completely into the sensor spring clip until it contacts the tooth wheel Figure 4 2 Figure 4 2 K 1002037a Spring Clip Sensor Holder Spring Clip Tab Sensor Revised 04 01 MERITOR
60. tails d Wear respirator equipped with HEPA filter approved by NIOSH or MSHA for use with asbestos when grinding or machining brake linings In addition do such work in an area with a local exhaust ventilation system equipped with a HEPA filter e NEVER use compressed air by itself dry brushing or a vacuum not equipped with a HEPA filter when cleaning brake parts or assemblies NEVER use carcinogenic solvents flammable solvents or solvents that can damage brake components as wetting agents 4 Cleaning Work Areas Clean work areas with a vacuum equipped with a HEPA filter or by wet wiping NEVER use compressed air or dry sweeping to clean work areas When you empty vacuum cleaners and handle used rags wear a respirator equipped with a HEPA filter approved by NIOSH or MSHA for use with asbestos When you replace a HEPA filter wet the filter with a fine mist of water and dispose of the used filter with care 5 Worker Clean Up After servicing brakes wash your hands before you eat drink or smoke Shower after work Do not wear work clothes home Use a vacuum equipped with a HEPA filter to vacuum work clothes after they are worn Launder them separately Do not shake or use compressed air to remove dust from work clothes 6 Waste Disposal Dispose of discarded linings used rags cloths and HEPA filters with care such as in sealed plastic bags Consult applicable EPA state and local regulations on waste disposal Regul
61. tands under the axle 3 Disconnect the fasteners that hold the sensor cable to other components 4 Disconnect the sensor cable from the chassis harness 5 Remove the sensor from the sensor holder Use a twisting motion if necessary Do not pull on the cable Figure 4 1 Figure 4 1 1002036 Knuckle Mounted Sensor MM30 Page 31 Section 4 Component Replacement MERITOR WABCO Wheel Speed Sensor Installation Front Axle To replace the sensor in the front axle 1 Connect the sensor cable to the chassis harness 2 Install the fasteners used to hold the sensor cable in place 3 Apply a Meritor WABCO recommended lubricant to the sensor spring clip and sensor 4 Install the sensor spring clip Make sure the spring clip tabs are on the inboard side of the vehicle 5 Push the sensor spring clip into the bushing in the steering knuckle until the clip stops 6 Push the sensor completely into the sensor spring clip until it contacts the tooth wheel NOTE After installation there should be no gap between the sensor and the tooth wheel During normal operation a gap of up to 0 04 inch is allowable 7 Remove the blocks and safety stands Wheel Speed Sensor Removal Rear Axle To remove the sensor from the rear axle A WARNING Park the vehicle on a level surface Block the wheels to prevent the vehicle from moving Support the vehicle with safety stands Do not work under a vehicle
62. to the receptacle Figure 3 17 1002033a Revised 04 01 MERITOR WABCO Section 3 Troubleshooting amp Testing 4 Turn the ignition to the ON RUN position The Pro Link screen should power up If the Pro Link does not power up or if the screen indicates NO DATA RECEIVED e Check connections e Make sure the cartridge is properly connected to the Pro Link keypad Verify 9 5 14 volts 12 volt system or 18 30 volts 24 volt system DC power and ground at the connector and ABS ECU Check the fuse panel for a blown fuse Check for proper wiring in the diagnostic connector 5 Referto the Pro Link manual for complete diagnostic and testing instructions The Pro Link 9000 is available from Kent Moore 800 328 6657 Pro Link Screens This information provides basic screen explanations for the Pro Link 9000 with a Meritor WABCO D version cartridge For complete operating instructions and test information refer to the Pro Link manual The most commonly used types of screens are the Fault Information screens and the Component Test screens Fault Information Screens Existing Faults Use these screens to identify existing faults The Pro Link screen displays a written description of the fault including the location on the vehicle where each exists As long as there is an active existing fault in the system the Pro Link will not let you clear faults Stored Faults Use these screens to id
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