2004 IMPREZA SERVICE MANUAL QUICK REFERENCE INDEX
Contents
1. ABS00135 1 Main fuse box 2 FWD connector NOTE AWD circuit of MT models can not be disabled be cause viscous coupling is used inside center differ ential 2 Prepare for operating the ABS sequence control lt Ref to ABS 10 ABS Sequence Control gt 3 Set the front wheels or rear wheels on the brake tester and set the select levers position at N range KEE ABS00136 ABS00137 1 Brake tester 4 Operate the brake tester 5 Perform the ABS sequence control lt Ref to ABS 10 ABS Sequence Control gt 6 Hydraulic unit begins to work and check the fol lowing working sequence 1 The FL wheel performs decompression holding and compression in sequence and subsequently the FR wheel repeats the cycle 2 The RR wheel performs decompression holding and compression in sequence and subsequently the RL wheel repeats the cycle 7 Read values indicated on the brake tester and check if the fluctuation of values when decom pressed and compressed meets the standard val ues Front wheel Rear wheel Initial value 1 000 N 102 kgf 225 Ib 1 000 N 102 kgf 225 Ib Decompressed 500 N 51 kgf 112 Ib or less 500 N 51 kgf 112 Ib or less Compressed 1 000 N 102 kgf 225 Ib or more 1 000 N 102 kgf 225 Ib or more2. C INSPECTION 1 Check the connected and fixed condition of con nector 2 Check specifications of the mark with ABSCM8 amp H U Refer to SPECIFICATION for identification mark lt Ref to ABS 2 SPECIFICATIONS General De scription gt ABS00133 1 CHECKING THE HYDRAULIC UNIT ABS OPERATION BY PRESSURE GAUGE 1 Lift up the vehicle and remove the wheels 2 Disconnect the air bleeder screws from the FL and FR caliper bodies 3 Connect two pressure gauges to the FL and FR caliper bodies CAUTION e Pressure gauges used exclusively for brake fluid must be used e Do not employ pressure gauge previously used for transmission since the piston seal is expanded which may lead to malfunction of the brake NOTE Wrap sealing tape around the pressure gauge ABS00134 4 Bleed air from the pressure gauges 5 Perform the ABS sequence control lt Ref to ABS 10 ABS Sequence Control gt 6 When the hydraulic unit begins to work and first the FL side performs decompression holding and compression and then the FR side performs de compression holding and compression 7 Read values indicated on the pressure gauge and check if the fluctuation of the values between decompression and compression meets the stan dard values Also check if any irregular brake pedal tightness is felt Front wheel Rear wheel 3 500 kPa 3 500 k
3. English 22771AA030 Without printer e German 22771AA070 Without printer e French 22771AA080 Without printer e Spanish 22771AA090 Without printer 2 GENERAL PURPOSE TOOLS TOOL NAME REMARKS Circuit tester Used for measuring resistance voltage and ampere Pressure gauge Used for measuring oil pressure Oscilloscope ABS 5 Used for measuring sensor ABS Control Module and Hydraulic Control Unit ABSCM amp H U ABS 2 ABS Control Module and Hy draulic Control Unit ABSCM amp H U A REMOVAL 1 Disconnect the ground cable from battery 2 Remove the air intake duct from engine com partment to facilitate removal of ABSCM amp H U 3 Use an air gun to get rid of water around the ABSCM amp H U NOTE Contact will be insufficient if the terminal gets wet 4 Remove the ground cable from ABSCM amp H U 5 Pull off the lock of ABSCM amp H U connector to re move it ABS00131 6 Disconnect the connector from ABSCM amp H U CAUTION Do not pull the harness when disconnecting the connector 7 Unlock the cable clip 8 Disconnect the brake pipes from ABSCM amp H U 9 Wrap the brake pipes with vinyl bag to avoid spilling brake fluid on vehicle body CAUTION Brake fluid spilt on the vehicle body will harm the painted surface wash away quickly with water if spilt 10 Remov
4. B257 No 2 No 3 Is the voltage 1 5 0 2 V when lateral G sensor is inclined backwards to 90 Lateral G sensor is normal Replace the lat eral G sensor CHECK LATERAL G SENSOR 1 Turn the ignition switch to OFF 2 Connect the Subaru Select Monitor to data link connector 3 Turn the Subaru Select Monitor into BRAKE CONTROL mode 4 Set the display in the Current Data Display amp Save mode 5 Read the lateral G sensor output voltage Is the indicated reading 2 5 0 2 V when the vehicle is in horizontal position Go to step 6 Replace the lat eral G sensor CHECK LATERAL G SENSOR 1 Remove the console box 2 Remove the lateral G sensor from vehicle Do not disconnect the connector 3 Read the Subaru Select Monitor display Is the indicated reading 3 5 0 2 V when lateral G sen sor is inclined forwards to 90 Go to step 7 Replace the lat eral G sensor CHECK LATERAL G SENSOR Read the Subaru Select Monitor display Is the indicated reading 1 5 0 2 V when lateral G sen sor is inclined backwards to 90 ABS 24 Lateral G sensor is normal Replace the lat eral G sensor
5. 8 After checking also check if any irregular brake pedal tightness is felt D REPLACE 1 ABSCM ABS CONTROL MODULE 1 Disconnect the ground cable from battery 2 Disconnect the ABSCM harness connector 3 Remove the bracket mounting nut of AB SCM amp H U ABS00447 1 ABSCM harness connector 2 Bracket mounting nut 4 Leaving the brake pipe connected raise the AB SCM amp H U for approx 5 cm 2 0 in from bracket CAUTION Do not deform the brake pipe 5 Unlock the motor power supply connector lock and disconnect the connector 6 Using TORX BIT T20 remove the screws 1 2 3 4 5 6 in this order ABS 8 ABS Control Module and Hydraulic Control Unit ABSCM amp H U ABS CAUTION Do not reuse the screw ABS00448 A Motor power supply connector lock B Motor power supply connector 7 Remove the ABSCM from H U CAUTION es Do not pry the ABSCM out extract it straight out against H U es Do not reuse the seal of ABSCM AZ ABS00449 1 HU 2 Valve 3 ABSCU 8 Check that H U seal surface is free from dust and damages CAUTION e If damage is found on seal surface replace the H U es Do not apply compressed air to ABSCM amp H U for cleaning 9 Install ABSCM straight for ward on to H U being careful not to scratch the valve 10 Temporarily tighten the six new screws by hand 11 Using TORX B
6. Model gt lt Ref to DS 33 INSTALLATION Rear Axle FWD Model gt C INSPECTION Visually check the tone wheel s teeth 44 pieces for cracks or dents If necessary replace the tone wheel with a new one ABS 20 G Sensor ABS 8 G Sensor A REMOVAL 1 Disconnect the ground cable from battery 2 Remove the console cover lt Ref to El 42 REMOVAL Console Box gt 3 Disconnect the connector from G sensor 4 Remove the G sensor from body CAUTION es Do not drop or bump the G sensor e G sensor and the bracket are integrated into one unit Therefore do not disassemble it ABS00151 B INSTALLATION Install in the reverse order of removal CAUTION Do not drop or bump the G sensor Tightening torque 18 N m 1 8 kgf m 13 0 ft Ib ABS 21 ABS C INSPECTION Step G Sensor Check Yes No CHECK SUBARU SELECT MONITOR Do you have a SUBARU SELECT MONITOR Go to step 5 Go to step 2 CHECK G SENSOR 1 Turn the ignition switch to OFF 2 Remove the G sensor from vehicle 3 Connect the connector to G sensor 4 Turn the ignition switch to ON 5 Measure the voltage between G sensor con nector terminals Connector amp terminal B292 No 2 No 3 Is the voltage 2 3 0 2 V when G sensor is horizontal Go to step 3 Replace the G sensor CHECK G SENSOR Measure the voltage between G sensor con nector terminals Conne
7. or Subaru Select Monitor 1 ABS SEQUENCE CONTROL WITH DIAG NOSIS CONNECTOR 1 Turn the ignition switch to OFF 2 Connect the diagnosis terminal to terminal No 6 of the diagnosis connector beside driver s seat ABS00138 Diagnosis connector Diagnosis terminals Terminal No 3 Terminal No 6 3 Turn the ignition switch to ON 4 Confirm that start code code 11 is only dis played 5 Turn the ignition switch to OFF 6 Connect the diagnosis terminals to terminals No 6 and No 3 of diagnosis connector 7 Set the speed of all wheels at 4 km h 2 MPH or less 8 Turn the ignition switch to ON 9 Within 0 5 seconds after the ABS warning light goes out depress the brake pedal and hold it de pressed NOTE Engine must not operate CAUTION Do not depress the clutch pedal in case of vehi cle with hill holder 10 After completion of ABS sequence control turn the ignition switch to OFF 2 ABS SEQUENCE CONTROL WITH SUB ARU SELECT MONITOR NOTE es Inthe event of any trouble the sequence control may not be operative In such a case activate the sequence control referring to ABS SEQUENCE CONTROL WITH DIAGNOSIS CONNECTOR lt Ref to ABS 10 ABS SEQUENCE CONTROL WITH DIAGNOSIS CONNECTOR ABS Sequence Control gt e When the diagnosis terminal is connected to the diagnosis connector the sequence control will not operate 1 Connect the Subaru Select Monitor to data link conne
8. 2004 IMPREZA SERVICE MANUAL QUICK REFERENCE INDEX CHASSIS SECTION FRONT SUSPENSION REAR SUSPENSION RS WHEEL AND TIRE SYSTEM WT DIFFERENTIALS DI This service manual has been prepared to provide SUBARU service personnel with the necessary information and data for the correct maintenance and repair of SUBARU vehicles This manual includes the procedures for maintenance disassembling reas sembling inspection and adjustment of ABS ABS components and diagnostics for guid ance of experienced mechanics Please peruse and utilize this manual fully to ensure complete repair work for satisfying our customers by keeping their vehicle in optimum condition BRAKE BR When replacement of parts during repair work is needed be sure to use SUBARU genuine parts PARKING BRAKE PB TRANSFER CASE TC DRIVE SHAFT SYSTEM DS ABS DIAGNOSTICS ApBSidtag POWER ASSISTED SYSTEM POWER STEERING All information illustration and specifi cations contained in this manual are based on the latest product information available at the time of publication approval FUJI HEAVY INDUSTRIES LTD G1870GE5 AA a A ABS OO AI Page General leste a diia 2 ABS Control Module and Hydraulic Control Unit ABSCM8H U 6 ABS Sequence CONTO snnceves dev et eege enner tenann nenne eeen 10 Front ABS Wheel Speed Gensor ena 13 Rear ABS Wheel Speed Sensor sssssnseseseeeetrrttttereretttttaeeeernnnnnnnnnnre
9. ALLATION 1 Temporarily install the front ABS wheel speed sensor on housing CAUTION Be careful not to strike the ABS wheel speed sensor s pole piece against tone wheel and ad jacent metal parts during installation 2 Install the front ABS wheel speed sensor on strut and wheel apron bracket Tightening torque 33 N m 3 3 kgf m 24 ft lb 1 To front ABS wheel speed sensor connector 2 Bracket ABS 13 Front ABS Wheel Speed Sensor ABS 3 Check the ABS wheel speed sensor gap lt Ref to ABS 14 SENSOR GAP INSPECTION Front ABS Wheel Speed Sensor gt After standard clear ance is obtained tighten the ABS wheel speed sensor on housing to specified torque If the clearance is outside specification readjust using spacer Part No 26755AA000 ABS wheel speed sensor standard clearance 0 3 0 8 mm 0 012 0 031 in Tightening torque 33 N m 3 3 kgf m 24 ft lb 00142 NOTE e Check the marks on the harness and make sure that no kink exists RH White LH Yellow Make sure the harness is not pulled and does not contact to suspension or body when steering wheel is turned 4 After confirmation of the ABS wheel speed sen sor clearance connect the connector to ABS wheel speed sensor 5 Connect the battery ground cable to battery C INSPECTION 1 ABS WHEEL SPEED SENSOR 1 Check the pole piec
10. Hz NOTE Regarding terminal No please refer to item 1 ABS WHEEL SPEED SENSOR lt Ref to ABS 17 ABS WHEEL SPEED SENSOR INSPECTION Rear ABS Wheel Speed Sensor gt 60 mV 60 mV 20 Hz 17 8 KQ4 5 5620 5 33 nF 20 ABS00146 1 Oscilloscope 2 Terminal D ADJUSTMENT Adjust the gap using spacer Part No 26755AA000 ABS 18 Front Tone Wheel 6 Front Tone Wheel A REMOVAL Refer to Front Drive Shaft because front tone wheel is integrated with front drive shaft lt Ref to DS 36 REMOVAL Front Drive Shaft gt B INSTALLATION Refer to Front Drive Shaft because front tone wheel is integrated with front drive shaft lt Ref to DS 36 INSTALLATION Front Drive Shaft gt C INSPECTION Visually check the tone wheel s teeth 44 pieces for cracks or dents If necessary replace the tone wheel with a new one NOTE Replace the BJ assembly with a new one as a sin gle unit if there are any defects found on tone wheel is unitized with BJ assembly of drive shaft ABS 19 ABS Rear Tone Wheel ABS 7 Rear Tone Wheel A REMOVAL Refer to Rear Axle because the rear tone wheel is installed to rear hub lt Ref to DS 25 REMOVAL Rear Axle AWD Mod el gt lt Ref to DS 33 REMOVAL Rear Axle FWD Modell B INSTALLATION Refer to Rear Axle because the rear tone wheel is installed to rear hub lt Ref to DS 28 INSTALLATION Rear Axle AWD
11. IT T20 tighten the screws 1 2 3 4 5 6 in this order Tightening torque 2 65 N m 0 27 kgf m 1 95 ft lb ABS00450 12 Make sure no clearance exists at the mating surface of ABSCM and H U 13 Connect the motor power supply connector to ABSCM CAUTION Securely connect the connector until connec tor lock sound is heard 14 Attach the ABSCM amp H U to bracket and then tighten with nuts Tightening torque 18 N m 1 8 kgf m 13 0 ft lb 15 Connect the ABSCM harness connector 16 Connect the battery ground cable to battery 17 Turn the ignition key to ON Check the ABS warning light turns on normally then off 18 Check that correct information model year drive system transmission type is displayed on the initial screen by connecting Subaru Select Mon itor 19 Start the engine and move the car to accelerate to more than 20 km h 12 4 MPH Check the ABS warning light dose not turn on 20 If any abnormal is found during the work of step 17 to 19 repair according to the procedure of rel evant failure in ABS DIAGNOSTICS section ABS 9 ABS Sequence Control ABS 3 ABS Sequence Control A OPERATION 1 Under the ABS sequence control after the hy draulic unit solenoid valve is driven the operation of the hydraulic unit can be checked by means of the brake tester or pressure gauge 2 ABS sequence control can be started by diagno sis connector
12. Pa 36 kgf cm 511 psi 36 kgf cm 511 psi 500 kPa 500 kPa 5 kgf cm 73 psi 5 kgf cm 73 psi or less or less 3 500 kPa 3 500 kPa Compressed 36 kgf cm 511 psi 36 kgf cm 511 psi or more or more Initial value Decom pressed 8 Remove the pressure gauges from the FL and FR caliper bodies 9 Remove the air bleeder screws from the RL and RR caliper bodies 10 Connect the air bleeder screws to the FL and FR caliper bodies 11 Connect two pressure gauges to the RL and RR caliper bodies 12 Bleed air from the pressure gauges and the FL and FR caliper bodies 13 Perform the ABS sequence control lt Ref to ABS 10 ABS Sequence Control gt 14 When the hydraulic unit begins to work at first the RR side performs decompression holding and compression and then the RL side performs de compression holding and compression 15 Read values indicated on the pressure gauges and check if they meet the standard value 16 After checking remove the pressure gauges from caliper bodies 17 Connect the air bleeder screws to RL and RR caliper bodies 18 Bleed air from the brake line ABS 7 ABS Control Module and Hydraulic Control Unit ABSCM amp H U ABS 2 CHECKING THE HYDRAULIC UNIT ABS OPERATION WITH BRAKE TESTER 1 In the case of AWD AT models install a spare fuse with the FWD connector in the main fuse box to simulate FWD models 80 TK CO E el JO S
13. ctor amp terminal B292 No 2 No 3 Is the voltage 3 9 0 2 V when G sensor is inclined forwards to 90 Go to step 4 Replace the G sensor CHECK G SENSOR Measure the voltage between G sensor con nector terminals Connector amp terminal B292 No 2 No 3 Is the voltage 0 7 0 2 V when G sensor is inclined backwards to 90 G sensor is nor mal Replace the G sensor CHECK G SENSOR 1 Turn the ignition switch to OFF 2 Connect the Subaru Select Monitor to data link connector 3 Turn the Subaru Select Monitor into BRAKE CONTROL mode 4 Set the display in the Current Data Display amp Save mode 5 Read the G sensor output voltage Is the indicated reading 2 3 0 2 V when the vehicle is in horizontal position Go to step 6 Replace the G sensor CHECK G SENSOR 1 Remove the console box 2 Remove the G sensor from vehicle Do not disconnect the connector 3 Read the Subaru Select Monitor display Is the indicated reading 3 9 0 2 V when G sensor is inclined forwards to 90 Go to step 7 Replace the G sensor CHECK G SENSOR Read the Subaru Select Monitor display Is the indicated reading 0 7 0 2 V when G sensor is inclined backwards to 90 ABS 22 G sensor is nor mal Replace the G sensor Lateral G Sensor 9 Lateral G Sensor A REMOVAL 1 Disconnect the ground cable from battery 2 Remove the consol
14. ctor under driver s seat instrument panel low er cover 2 Turn the ignition switch to ON 3 Turn the Subaru Select Monitor switch to ON 4 Put the Subaru Select Monitor to BRAKE CON TROL mode 5 When Function check sequence is selected ABS sequence control will start 6 When the message Press Brake Pedal Firmly is displayed perform the followings 1 When using the brake tester depress the brake pedal with braking force of 1 000 N 102 kgf 225 lb 2 When using the pressure gauge depress the brake pedal so as to make the pressure gauge indicate 3 500 kPa 36 kg cm 511 psi CAUTION Do not depress the clutch pedal in case of vehi cle with hill holder 7 When the message Press YES is displayed press the YES key 8 The braking system in operation is displayed on Subaru Select Monitor ABS 10 ABS Sequence Control ABS 3 CONDITIONS FOR ABS SEQUENCE CONTROL V max lt 4 km h 2 5 MPH 1 V max lt 10 km h 6 MPH 2 17 28 3 OFF 18 ON 29 Ss 30 e 29 d 4 19 20 Las Go Laaf eo LOD 21 5 OFF FONT 6 22 31 a VI oe ECH e EE onL 9 OFF ON 32 i gt 10 OFF ON 80 un LOFE ON 12 OFF ON ua LOFF ON aa OF ON as OFF ON ae LOFF ON 33 23 24 25 26 27 ABS00014 ABS 11 ABS S
15. e cover lt Ref to El 42 REMOVAL Console Box gt 3 Disconnect the connector from lateral G sensor 4 Remove the lateral G sensor from vehicle CAUTION Do not drop or bump the lateral G sensor a ae MU H MAL ABS00374 B INSTALLATION Install in the reverse order of removal CAUTION Do not drop or bump the lateral G sensor Tightening torque 18 N m 1 8 kgf m 13 0 ft lb ABS 23 ABS Lateral G Sensor C INSPECTION Step Check Yes No CHECK SUBARU SELECT MONITOR Do you have a SUBARU SELECT MONITOR Go to step 5 Go to step 2 CHECK LATERAL G SENSOR 1 Turn the ignition switch to OFF 2 Remove the lateral G sensor from vehicle 3 Connect the connector to lateral G sensor 4 Turn the ignition switch to ON 5 Measure the voltage between lateral G sen sor connector terminals Connector amp terminal B257 No 2 No 3 Is the voltage 2 5 0 2 V when lateral G sensor is horizontal Go to step 3 Replace the lat eral G sensor CHECK LATERAL G SENSOR Measure the voltage between lateral G sensor connector terminals Connector amp terminal B257 No 2 No 3 Is the voltage 3 5 0 2 V when lateral G sensor is inclined for wards to 90 Go to step 4 Replace the lat eral G sensor CHECK LATERAL G SENSOR Measure the voltage between lateral G sensor connector terminals Connector amp terminal
16. e of ABS wheel speed sen sor for foreign particles or damage If necessary clean the pole piece or replace ABS wheel speed sensor 2 Measure the ABS wheel speed sensor resis tance If the resistance is outside standard value replace the ABS wheel speed sensor with a new one DR __ Q ABS00143 Standard 1 25 0 25 kQ Terminal No 1and2 NOTE Check the ABS wheel speed sensor cable for dis continuity If necessary replace with a new one 2 SENSOR GAP 1 Measure the distance A between ABS wheel speed sensor surface and sensor pole face A E 2 Measure the distance B between surface where the front axle housing meets the ABS wheel speed sensor and the tone wheel NOTE Measure so that the gauge touches the tone wheel teeth top ABS00144 ABS00145 1 Axle housing 2 Tone wheel 3 Find the gap between the ABS wheel speed sen sor pole face and the surface of the tone wheel teeth by putting the measured values in the formula below and calculating ABS wheel speed sensor clearance B A ABS wheel speed sensor standard clearance 0 3 0 8 mm 0 012 0 031 in NOTE If the clearance is out of specification readjust us ing spacer Part No 26755AA000 ABS 14 Front ABS Wheel Speed Sensor ABS 3 OUTPUT VOLTAGE Output voltage can be checked by the following method Install
17. e the ABSCM amp H U from engine com partment CAUTION es Do not drop or bump the ABSCM amp H U es Do not turn the ABSCM amp H U upside down or place it on its side e Be careful to prevent foreign particles from getting into ABSCM amp H U Do not let water get into the connector o ABS00132 B INSTALLATION 1 Install the ABSCM amp H U bracket Tightening torque 33 N m 3 3 kgf m 24 ft lb 2 Apply a coat of grease Nippeco LT or GB to the bracket attaching bolt 3 Align the width across flat portion of ABSCM amp H U side stud bolt with the bolt hole groove on bracket and then install the ABSCM amp H U NOTE Confirm the specification mark of ABSCM amp H U Tightening torque 18 N m 1 8 kgf m 13 0 ft lb t ABS00132 4 Connect the brake pipes to their correct ABSCM amp H U connections Tightening torque 15 N m 1 5 kgf m 10 8 ft Ib 5 Using the cable clip secure the ABSCM amp H U harness to bracket 6 Connect the connector to ABSCM amp H U NOTE Be sure to remove all foreign matter from inside of the connector before connecting e Ensure the ABSCM amp H U connector is securely locked 7 Connect the ground cable to ABSCM amp H U and then apply grease 8 Install the air intake duct 9 Bleed air from the brake system ABS 6 ABS Control Module and Hydraulic Control Unit ABSCM amp H U ABS
18. eel on hub then rear housing on hub lt Ref to DS 31 ASSEMBLY Rear Axle AWD Model gt lt Ref to DS 34 ASSEMBLY Rear Axle FWD Model gt 2 Temporarily install the rear ABS wheel speed sensor on back plate CAUTION Be careful not to strike the ABS wheel speed sensor s pole piece against tone wheel and ad jacent metal parts during installation ABS00147 1 Rear ABS wheel speed sensor 3 Install the rear drive shaft to rear housing and rear differential spindle lt Ref to DS 28 INSTAL LATION Rear Axle AWD Model gt lt Ref to DS 33 INSTALLATION Rear Axle FWD Model gt 4 Install the rear sensor harness on rear trailing link Tightening torque 33 N m 3 3 kgf m 24 ft lb ABS00148 1 Rear sensor harness 2 Trailing link 5 Check the ABS wheel speed sensor gap lt Ref to ABS 17 SENSOR GAP INSPECTION Rear ABS Wheel Speed Sensor gt After standard clear ance is obtained tighten the ABS wheel speed sensor on back plate to specified torque If the clearance is outside specification readjust using spacer Part No 26755AA000 ABS wheel speed sensor standard clearance 0 7 1 2 mm 0 028 0 047 in Tightening torque 33 N m 3 3 kgf m 24 ft lb NOTE Check the marks on the harness and make sure no kink exists RH Light blue LH Brown ABS 16 Rear ABS Wheel Speed Sensor 6 After confirmation of the ABS wheel speed sen s
19. eena 16 Front Tone Wh e liviana daa a da ida 19 Rear Tone Wee 20 IESSE 21 Lateral G Sensor E 23 ABS General Description 1 General Description A SPECIFICATIONS Item Specification or remarks ABS wheel speed sensor ABS wheel speed sensor gap 0 3 0 8 mm 0 012 0 031 in 0 7 1 2 mm 0 028 0 047 in ABS wheel speed sensor resis tance 1 25 0 25 kQ 1 15 0 115 KQ White Front Yellow Marks of harness Light blue Rear Brown G sensor G sensor voltage 2 3 0 2 V Lateral G sensor STi model Lateral G sensor voltage 2 5 0 2 V ABSCM amp H U marks AT model CK FWD MT model CL AT model CU MT model Except Sedan STi model CV MT model Sedan STi model without driver s con trol center differential CX MT model Sedan STi model with driver s control center differential ABS 2 General Description ABS B COMPONENT 1 SENSOR ABS00210 1 G sensor 5 Front ABS wheel speed sensor LH Tightening torque N m kgf m ft lb 2 Rear ABS wheel speed sensor 6 Front ABS wheel speed sensor T1 18 1 8 13 0 RH RH T2 33 3 3 24 3 Adjusting spacer 7 Lateral G sensor STi model Rear ABS wheel speed sensor LH ABS 3 General Descrip
20. equence Control ABS 1 Speed of wheels 12 RR outlet valve 24 Pressure of FL wheel cylinder 2 Terminal DK and DL 13 RR inlet valve 25 Pressure of FR wheel cylinder 3 Ignition key 14 RL outlet valve 26 Pressure of RR wheel cylinder 4 ABS warning light 15 RL inlet valve 27 Pressure of RL wheel cylinder 5 Stop light switch 16 Pump motor 28 Either HI or LO possible if using 6 Signal to Transmission control 17 Connection to ground terminal Subaru Select Monitor module TCM 18 1 5 seconds 29 1 4 second 7 Valve relay 19 Not illuminated 30 1 0 second 8 FL outlet valve 20 Illuminated 31 ABS working 9 FL inlet valve 21 Within 0 5 second 32 0 4 second 10 FR outlet valve 22 ABS not working 33 Point A 11 FR inlet valve 23 Pressure of master cylinder NOTE When the Subaru Select Monitor is used control operation starts at point A The patterns from IGN key ON to the point A show that operation is started by diagnosis connector However the brake light switch must be ON before point A B SPECIFICATION 1 CONDITIONS FOR COMPLETION OF ABS SEQUENCE CONTROL When the following conditions develop the ABS sequence control stops and ABS operation is returned to the normal control mode 1 When the speed of at least one wheel reaches 10 km h 6 MPH 2 When terminal No 3 or No 6 are separated from diagnosis terminals When the Subaru Select Monitor is not used 3 When
21. or clearance connect the connector to ABS wheel speed sensor 7 Connect the battery ground cable to battery C INSPECTION 1 ABS WHEEL SPEED SENSOR 1 Check the pole piece of ABS wheel speed sen sor for foreign particles or damage If necessary clean the pole piece or replace ABS wheel speed sensor 2 Measure the ABS wheel speed sensor resis tance If resistance is out of standard value replace the ABS wheel speed sensor with a new one 211 ABS00143 Terminal No Standard 1and2 1 15 0 115 kQ NOTE Check the ABS wheel speed sensor cable for dis continuity If necessary replace with a new one 2 SENSOR GAP 1 Measure the clearance between tone wheel and ABS wheel speed sensor at whole periphery NOTE If clearance is narrow adjust by using spacer Part No 26755AA000 If clearance is wide check the outputted voltage then replace the ABS wheel speed sensor or tone wheel if the outputted voltage is outside specifica tion ABS 17 ABS ABS wheel speed sensor clearance 0 7 1 2 mm 0 028 0 047 in NO ABS00149 1 Tone wheel 2 ABS wheel speed sensor 3 Sensor gap Rear ABS Wheel Speed Sensor ABS 3 OUTPUT VOLTAGE Output voltage can be checked by the following method Install the resistor and condenser then ro tate the wheel about 2 75 km h 2 MPH or equiva lent Output voltage specification 0 12 1 V at 20
22. the brake pedal is released during sequence control and the braking lamp switch is set to off 4 When the brake pedal is depressed after ignition key is turned to ON and before ABS warning light goes out When the Subaru Select Monitor is not used 5 When the brake pedal is not depressed after ignition key is turned to ON and within 0 5 seconds after ABS warning light goes out When the Subaru Select Monitor is not used 6 After completion of the sequence control 7 When malfunction is detected When the Subaru Select Monitor is used ABS 12 Front ABS Wheel Speed Sensor 4 Front ABS Wheel Speed Sen sor A REMOVAL 1 Disconnect the ground cable from battery 2 Disconnect the front ABS wheel speed sensor connector located next to the front strut mounting house in engine compartment Pull the connector out from grommet hole to tire side 3 Remove the bolts which secure the sensor har ness to strut ABS00140 4 Remove the bolts which secure the sensor har ness to body 1 To front ABS wheel speed sensor connector 2 Bracket 5 Remove the bolts which secure the front ABS wheel speed sensor to housing and remove the front ABS wheel speed sensor CAUTION es Be careful not to damage the pole piece locat ed at tip of the sensor and teeth faces during re moval ABS Do not pull the sensor harness during remov al 00142 B INST
23. the resistor and condenser then ro tate the wheel about 2 75 km h 2 MPH or equiva lent Output voltage specification 0 12 to 1 V at 20 Hz NOTE Regarding terminal No please refer to item 1 ABS WHEEL SPEED SENSOR lt Ref to ABS 14 ABS WHEEL SPEED SENSOR INSPECTION Front ABS Wheel Speed Sensor gt 60 mV 60 mV 20 Hz 17 8 KQ4 5 5620 5 33 nF 20 ABS00146 1 Oscilloscope 2 Terminal D ADJUSTMENT Adjust the gap using spacer Part No 26755A000 ABS 15 Rear ABS Wheel Speed Sensor ABS 5 Rear ABS Wheel Speed Sen sor A REMOVAL 1 Disconnect the ground cable from battery 2 Lift up the vehicle 3 Remove the rear seat and disconnect the rear ABS wheel speed sensor connector Pull the con nector out from grommet hole to under floor 4 Remove the rear sensor harness bracket from the rear trailing link and bracket 5 Remove the rear ABS wheel speed sensor from back plate CAUTION es Be careful not to damage the pole piece locat ed at tip of the sensor and teeth faces during re moval Do not pull the sensor harness during remov al ABS00147 1 Rear ABS wheel speed sensor 6 Remove the rear tone wheel while removing the hub from housing and hub assembly lt Ref to DS 25 REMOVAL Rear Axle AWD Model gt lt Ref to DS 33 REMOVAL Rear Axle FWD Model gt B INSTALLATION 1 Install the rear tone wh
24. tion ABS 2 ABS CONTROL MODULE AND HYDRAULIC CONTROL UNIT ABSCM amp H U ABS00472 1 Stud bolt 7 Primary inlet Tightening torque N m kgf m ft lb 2 Damper 8 Rear LH outlet T1 2 65 0 27 1 95 3 ABS control module and hydraulic 9 Rear RH outlet T2 18 1 8 13 0 control unit ABSCM amp H U 10 Bracket T3 33 3 3 24 4 Front LH outlet 11 ABS control module ABSCM T4 38 3 8 27 5 5 Secondary inlet 12 Screw 6 Front RH outlet C CAUTION e Before disconnecting electrical connectors of sensors or units be sure to disconnect the ground cable from battery e Wear working clothing including a cap protec tive goggles and protective shoes during opera tion e Before removal installation or disassembly be sure to clarify the failure Avoid unnecessary re moval installation disassembly and replacement Be careful not to burn your hands because each part in the vehicle is hot after running e Be sure to tighten fasteners including bolts and nuts to the specified torque e Place shop jacks or rigid racks at the specified points ABS 4 General Description ABS D PREPARATION TOOL 1 SPECIAL TOOLS ILLUSTRATION TOOL NUMBER DESCRIPTION REMARKS 24082AA230 CARTRIDGE Troubleshooting for electrical systems ST24082AA230 22771AA030 SUBARU SELECT Troubleshooting for electrical systems ST22771AA030 MONITOR KIT
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