UI BULLETIN #53
Contents
1. PTO VARIABLE MODE FUNCTION CHART SWITCH RESUME w Cruise only Engine speed will decrease by 100 rpm decrements and will Engine speed will increase by 100 rpm maintain new engine speed increments and will maintain new engine value Engine speed can be speed value Engine speed can be PRESSED ONCE decreased down to PTO increased up to the PTO Max Engine Standby RPM speed value all Speed value all further RESUME inputs further SET inputs will be will be ignored ignored Decelerates engine speed HELD down to the PTO standby Increases engine speed up to the PTO max engine speed value speed value bulletin zyk 53 7 of 28 2 11 02 m UI BULLETIN 53 Cont d CITIES PTO SPEED CONTROL IN VARIABLE MODE WHILE MOBILE T Vehicle speed greater than 5 mph 2 Foot off brake pedal and or off clutch for manual transmission 3 Turn the PTO switch to the ON position The engine speed will increase to the PTO Standby Speed The PTO is engaged when the LED on the PTO control switch changes from blinking to steady state 4 Obtain the desired engine speed with gas pedal and pressing SET on the PTO switch or the cruise control stalk 5 The SET and RESUME switches can then be used to adjust the engine speed in 100 rpm increments USING PTO SPEED CONTROL IN VARIABLE MODE WHILE STATIONARY 1 Vehicle speed must be zero 2 Foot off brake pedal and or off clutch for manual transmission 3 Turn the PTO switch2. UI BULLETIN 53 SUBJECT Power Take Off PTO amp High Idle CFF TIER MODELS AFFECTED C K 3600 Cab Chassis 3500 2500 HD and 3500 HD with the 8 1L L18 Gas amp 6 6L LB7 Diesel Engine MODEL YEAR S 2001 and Beyond DATE 2 11 02 REVISION DATE PAGE 1 of 28 ADVISORY The purpose of this bulletin is to provide upfitters an Specialty Vehicle Manufacturers SVM s with information regarding the PTO and High Idle options available on select GM Light Duty trucks This bulletin also provides an overview of the Power Take Off PTO options control modes schematics approved PTO suppliers installation of the PTO accessory kit and Fast Idle switch Note If planning on installing a transmission mounted Power Take Off unit on a C K 3600 Cab Chassis truck follow the installation procedure provided by the PTO manufacturer This bulletin is intended to provide information that is not pro vided in the GM Service Manual or by the PTO manufacturer TABLE OF CONTENTS Page 2 Overview Pages 3 4 PTO Information Pages 5 6 PTO Preset Mode Page 7 8 PTO Variable Mode Page 9 10 High Idle Procedure for C K 2500HD amp 3500 series trucks with 8 1L L18 Gas Engine Page 11 12 High Idle Procedure for C K 2500HD amp 3500 series trucks with 6 6L LB7 Diesel Engine Page 13 14 PTO High Idle Procedure for 3500HD 15 000 GVWR with 8 1L L18 gas Engine Page 15 16 Fast Idle Switch Installation on 8 1L L18 Gas Engine Page 1
3. 04V S oce CO i PTO Plo Pro Engine y Ground 1 Engage Engine Enable Status l Control I pierbutor in I Pes Kill ee Switch Module Wiring Systems I n MECM t 4 Blunt Cut bos oa SSeS oS Seo SS a ee eee eS ele SS 4 7 G203 G104 bulletin zyk 53 18 of 28 2 11 02 UI BULLETIN 53 Cont d E OPPITTE PTO SCHEMATIC FOR 8 1L L18 GAS ENGINE ON 3500HD 15 000 LB GVWR rio oe S217 EE m Fuse DOSE 7 7 7 Fuse a ea C losmbuos lero Bck Power Distribution CRUISE Block DEM l Schematics in Same P Underhood E Lam LA in Lighting Systems 98216 05 PPLWHT 1382 0 5 ORN 1040 Cruise Illumination Control Indicat Switch I D ts cuis S GRY 397 UM 84 Co 4 S226 gong M isst 0 5 BLK 150 Switch 0 5 LT GAN 48895 Switch 0 5 GRY 397 GRY BLK 84 0 5 YEL 938 C4 E6 B2 E7 C100 0 5 GRY 397 0 5 LT GRN 488 TAC TM GRY BLK 84 o 5 LT GRN 0 5 YEL 938 30 161 PTO 160 TN 162 87 o GRN 488 0 5 LT GRN 488 0 5 YEL 938 298 4 YEL 938 0 5 GRY BLK 84 0 5 LT BLU 494 B 1 BLK 150 NN E RE 21 1 01 0 5 A g ud Pon E px Powertrain Ground Conto PTO PTO Control G C138 Distribution CONN Enable Status PTO Module Lupa Cea ae A Schematics Signal Signal Engine PCM in Wiring EE BLU Kil Stine i EE RED 9 Signal I 107 xccl pe EM 8BLK 150 I 2 200 bulletin zyk 53 19 of 28 2 11
4. PTO or Variable PTO Mode when using the PTO switch The changes that need to be made are as follows PTO Max Engine Speed 2200 RPM PTO Standby Speed 800 RPM PTO Set Speed 1250 RPM PTO Resume Speed 1700 RPM PTO Max Engage Speed 1000 RPM PTO Shutdown NO PTO Engage Relay NO PTO Feedback NO NOTE If the reprogramming of the PCM is not performed the High Idle function will not work bulletin zyk 53 9 of 28 2 11 02 m UI BULLETIN 53 Cont d CITIES HIGH IDLE PROCEDURE FOR C K 2500HD amp 3500 SERIES TRUCKS WITH 8 1L L18 GAS ENGINE CON T To engage the High Idle set the Park Brake manual transmission only or put the truck in PARK automatic transmission only turn the switch to the ON position Move the PTO switch to the SET position or press the SET switch on the cruise control stalk if equipped The SET input ramps up the engine speed to 1250 RPM By pressing the cruise control RES ACC switch the engine speed will increase to the PTO Resume Speed setting and any SET input will decrease the engine speed to the PTO Set Speed setting If the truck does not have the cruise control option only the PTO Set Speed is available The PTO High Idle settings can only be changed with a Tech 2 scan tool The Tech 2 scan tool can be purchased from GM by calling 1 800 GM TOOLS The PTO accessory kit is available from your local GM dealer If any problems should arise check and clear any DTC s with a Tech 2 and make sure
5. operation and return the engine speed to base engine idle speed NOTE If any problems should arise check and clear any DTC s with a Tech 2 and make sure that the brake switch and tail lamps are functioning correctly PLEASE CALL THE UPFITTER INTEGRATION HOTLINE AT 1 800 875 4742 WITH ANY QUESTIONS PERTAINING TO THIS BULLETIN bulletin zyk 53 16 of 28 2 11 02 UI BULLETIN 53 Cont d EJ 77775 PTO SCHEMATIC FOR 8 1L L18 GAS ENGINE ON C K 3600 CAB CHASSIS Hot at All Times Hoi In RUN r gt Eu a I Power 1 Junction Bane Power Ea i Distribution 1 Block Diaribuli n Distribution Schematics in Underhoad E i l Wiring Systems I idis in Wiri S97 es 2 FOG LAMPS l Systems I 15A I Foglamp 0 35 BRN l Schematics I 41 1 in Lighting 1 Lx Wem 0 Y 0 35 DK BLU 84 F4 C2 Body Control Schematics in Body Control System 0 35 0 8 ORN 3440 DK BLU 84 IP Schematios In Instrument Panel Gauges and Console PTO Set Switch B Blunt Cut 0 35 LT GRN 488 0 35 PETER is YEL 2522 0 8 BLK 550 A C106 D C107 0 35 LT GRN 488 0 8 BLK 550 2 BLK DK BLU 84 LT GRN 488 0 8 ve 2522 Transmission Tu Blunt Cut cock Blunt Cut rol schematics in 0 8 WHT 2561 Control ECN Automatio Schematics Transmission H C107 Allison 0 8 LT BLU 494 0 35 0 8 WHT 2561 B C107 LT GRN 0 35 PPL 2562 0 8 LT BLU 494 2 BLK 550 78 C
6. that the brake switch and tail lamps are functioning correctly NOTE In certain cases the PTO wiring and connector will not be installed behind the passenger side air bag switch If this is the case the system will need to be hard wired into the PCM and a switch or switches no cruise control will need to be used Please call the Upfitter Integration Hotline at 1 800 875 4742 for more information bulletin zyk 53 10 of 28 2 11 02 m UI BULLETIN 53 Cont d CITIES HIGH IDLE PROCEDURE FOR C K 2500HD amp 3500 SERIES TRUCKS WITH 6 6L LB7 DIESEL ENGINE High Idle can be obtained by using the 8 pin PTO connector behind the dash and the PTO accessory kit The PTO connector can be found behind the passenger air bag defeat switch It should be taped to the IP harness directly behind the passenger air bag defeat switch Mount the PTO switch next to the passenger air bag defeat switch The PTO interface wiring harness included with the PTO Kit is not needed unless a requirement for remote operation is desired Connect the Tech 2 scan tool and reprogram the Engine Control Module ECM See the PTO Programming Guide section for instructions on how to get to the PTO programming screen Remember to program to either the Preset PTO or Variable PTO Mode when using the PTO switch When the PTO settings are initially read the settings will show values of 6000 rpm Select the Change Options menu and continue with the reprogramming of the
7. to the ON position The engine speed will increase to PTO Standby Speed The PTO is engaged when the LED on the PTO control switch changes from blinking to steady state 4 Obtain the desired engine speed with gas pedal and pressing SET on the PTO switch or the cruise control stalk 5 The SET and RESUME switches can then be used to adjust the engine speed in 100 rpm increments NOTE If any input from the brake pedal or clutch pedal is detected PTO operation will be interrupted PTO Variable mode may be re enabled by pressing the RESUME switch Engine speed will increase to the speed prior to disabling bulletin zyk 53 8 of 28 2 11 02 m UI BULLETIN 53 Cont d CITIES HIGH IDLE PROCEDURE FOR C K 2500HD amp 3500 SERIES TRUCKS WITH 8 1L L18 GAS ENGINE High Idle can be obtained by using the 8 pin PTO connector behind the dash and the PTO accessory kit The PTO connector can be found behind the passenger air bag defeat switch It should be taped to the IP harness directly behind the passenger air bag defeat switch Mount the PTO switch next to the passenger air bag defeat switch The PTO interface wiring harness included with the PTO Kit is not needed unless a requirement for remote operation is desired Connect the Tech 2 scan tool and reprogram the Powertrain Control Module PCM See the PTO Programming Guide section for instructions on how to get to the PTO programming screen Remember to program to either the Preset
8. with engine RPM above 1100 RPM NOTE If any input from the brake pedal or clutch pedal is detected PTO operation will be interrupted For L18 gas engine the standby speed will again be established only after a toggle of the control switch to the SET position For the LB7 diesel engine the standby speed will be established with the release of the brake pedal or clutch pedal bulletin zyk 53 6 of 28 2 11 02 m UI BULLETIN 53 Cont d PE PTO VARIABLE MODE PTO Variable Speed Control Mode can be used for both stationary and mobile applications This mode allows PTO to be controlled in a fashion similar to which cruise control controls vehicle speed The operator is able to hold an engine RPM between 800 and 2200 with the SET switch on the cruise control stalk or the PTO switch The operator can tap up to in crease engine speed in 100 rpm increments with the RESUME switch on the cruise contro stalk or tap down to decrease engine speed with either SET switch on the cruise control stalk or the PTO switch Vehicles not equipped with cruise control will not have the tap up or tap down capability PROGRAMMABLE FACTORY SETTING MINIMUM VALUE MAXIMUM VALUE PARAMETERS RPM RPM RPM L18 2100 L18 4200 PTO Max Engine Speed 2200 LB7 950 LB7 3100 L18 650 Auto Manual LB7 600 PTO Standby RPM L18 800 850 Normal engine idle will LB7 800 800 override if higher than requested PTO Base idle PTO Max Engine
9. 02 PIE PTO Switch m UI BULLETIN 53 Cont d PTO SWITCH PTO RELAY amp PTO INTERFACE CONNECTORS 12186098 C tor Part Information 8 Way F Metri Pack 150 Series LT GRY Pin Wire Color Circuit No B LT GRN 488 j PowerTake Off Enable Switch c GRY 8 jnstrumentPanel Lamp Supply Voltage D GRY Power Take Off Status Feedback Ground Cruise Control Set Coast Switch LED Dimming Signal PTO Relay located backside of Underhood Junction Block 12129716 Part Inf Connector Part Information 1 Way F Metri Pack 280 FLX LK MD GRY Pin Wire Color Circuit No Battery Positive Voltage Power Take Off Enable Switch 86 PPL 2562 Power Take Off Relay Engage bulletin zyk 53 20 of 28 2 11 02 m UI BULLETIN 53 Cont d Te PTO SWITCH PTO RELAY amp PTO INTERFACE CONNECTORS CON T PTO Interface Connector located on the Transmission PTO Interface connector is only present on C K 3600 series trucks 12177081 Connector Part Information 7 way F M P 280 Series sealed NAT Pin Wire Color Circuit No Function B LT BLU 494 Power Take Off Engine Shutdown Signal D BLK 550 Ground 0 4 bulletin zyk 53 21 of 28 2 11 02 E PE UI BULLETIN 53 Cont d PCM amp ECM CONNECTORS FOR 8 1L L18 GAS AND 6 6L LB7 DIESEL ENGINES Blue PCM Connector on 8 1L Gas Engine Connector Par
10. 1 71 C1 22104 82 0 p Splice E AS pm TOTO ra TT TT p Poeni qanm Pack Engage Engine Enable Status Control Schematics in SP203 Kill Switch i Module l Wiring Systems set ee 2 Blunt Cut kl eee a Se A eee a ee re 4 POM id 203 6G104 bulletin zyk 53 17 of 28 2 11 02 UI BULLETIN 53 Cont d E 7 77 PTO SCHEMATIC FOR 6 6L LB7 DIESEL ENGINE ON C K 3600 CAB CHASSIS CN paa I Power Junction P Power in Cruise Control i Distribution Block Distribution Distribution D I Wiring Systems Y derhood Schematics Schematics 0 35 GRY 397 Fos LAMPS I dens 0 35 GRY 397 162 l Fog Lamp l 0 35 BRN 916 i muammo e 7 0 35 PPLWHT I des I y Ly a 1382 F4 c2 0 35 DK BLU 84 8 BUG jody Control Schematics in Body Control System 0 35 0 8 ORN 3440 DKBLU 84 IP Schematics in Instrument Panel Gauges and Console B Blunt Cut 0 35 LT GRN 488 35 M ERR ES C106 YEL 2522 0 8 BLK 550 1 A C106 D C107 0 35 163 LT GRN 488 Power 0 8 BLK 550 LT GRN 488 0 35 BLK 1850 Take Off PTO 4 G C109 2 BLK Rel clay LT GRN 488 0 8 YEL 2522 Transmission Blunt Cut Sna isi Blunt Cut 0 8 WHT 2561 Automatic Transmission H C107 Allison 0 8 LT BLU 494 0 35 0 35 0 8 WHT 2561 B4 C109 LT GRN 488 YEL 2522 0 35 PPL 2562 0 8 LT BLU 494 37 C2 56 C2 71 C1 13 C2 ordino xe Splice ESSPT S
11. 1000 RPM PTO Shutdown NO PTO Engage Relay NO PTO Feedback NO NOTE If the reprogramming of the PCM is not performed the High Idle function will not work bulletin zyk 53 13 of 28 2 11 02 m UI BULLETIN 53 Cont d CITIES PTO HIGH IDLE PROCEDURE FOR 3500HD 15 000 GVWR WITH 8 1L L18 GAS ENGINE CON T To engage the High Idle set the Park Brake Manual transmission only or put the truck in Park Automatic transmission only and turn the switch to the ON position Move the PTO switch to the SET position or press the SET switch on the cruise control if equipped The SET input ramps up the engine speed to 1250 RPM By pressing the cruise contro RES ACC switch the engine speed will increase to the PTO Resume Speed setting and any SET input will decrease the engine speed to the PTO Set Speed setting If the truck does not have the cruise control option only the PTO SET Speed is available The PTO High Idle settings can only be changed with a Tech 2 scan tool The Tech 2 scan tool can be purchased from GM by calling 1 800 GM TOOLS The PTO accessory kit is available from your local GM dealer NOTE If any problems should arise check for and clear any DTC s with a Tech 2 scan tool and make sure that the brake switch and tail lamps are functioning correctly bulletin zyk 53 14 of 28 2 11 02 m UI BULLETIN 53 Cont d CFF TIER FAST IDLE SWITCH INSTALLATION ON 8 1L L18 GAS ENGINE NOTE The fast idle s
12. 7 PTO Schematic for 8 1L L18 Gas Engine on C K 3600 Cab Chassis Page 18 PTO Schematic for 6 6L LB7 Diesel Engine on C K 3600 Cab Chassis Page 19 PTO Schematic for 8 1L L18 Gas Engine on 3500HD 15 000 GVWR Page 20 21 PTO Switch PTO Relay amp PTO Interface Connectors Page 22 PCM amp ECM Connectors for 8 1L L18 and 6 6L LB7 Diesel Engines Page 23 28 PTO Programming Guide m UI BULLETIN 53 Cont d Te OVERVIEW POWER TAKE OFF PTO Power Take Off PTO provisions have been provided as standard content on the C K 3600 Cab Chassis trucks with the 8 1L L18 gas engine and 6 6L LB7 Duramax diesel engine These provisions are included in two forced RPO s M1F and PTO The M1F and PTO options are not available on C K 3600 Cab Chassis trucks with the 6 0L LQ4 engine M1F and PTO are not available options on 2500HD and 3500 models HIGH IDLE High Idle is also available when a PTO device is not utilized but increased engine speed is required The Preset and Variable Mode controls operate in the same manner as the PTO controls Wiring provisions for in cab PTO Control switch is provided in most of the Light Duty trucks with the 8 1L L18 gas or 6 6L LB7 diesel engines only FAST IDLE Fast Idle provides an elevated engine speed control to one setting It is not to be used if any hydraulic application is intended Fast Idle requires hard wiring into the Powertrain Control Module PCM and the use of a momentary
13. Both PTO suppliers offer PTO kits to accommodate both the Allison 1000 automatic transmission and the ZF 6 speed manual transmission GM recommends that these kits be used for PTO installations on the C K 3600 Cab Chassis PTO ACCESSORY KIT GM Service Parts Organization offers a PTO Accessory Kit Part Number 12497678 that contains the PTO control switch and PTO interface wiring harness The PTO Accessory kit is required when PTO High Idle speed control is desired but the PTO supplier kits are not utilized The PTO accessory kit is available from your local GM dealer The following parts are included in the PTO Accessory Kit PTO control switch Instruction sheet PTO interface wiring harness includes a mating connector to the PTO interface connector and approx 3 ft of blunt cut wires Please Note The PTO accessory kit can be installed on GM Light Duty trucks with the 8 1L L18 gas or 6 6L LB7 diesel engines only Wiring provisions for in cab PTO Control switch is provided in most of the Light Duty trucks with the Li8 or LB7 engines only bulletin zyk 53 3 of 28 2 11 02 m UI BULLETIN 53 Cont d CITIES PTO INFORMATION CONT PTO CONTROL SWITCH The PTO option includes a provision for a dash mounted PTO control switch This switch is supplied with the Chelsea and Muncie PTO kits mentioned above or it can be purchased as part of the PTO accessory kit The PTO control switch has three positions O
14. ECM The changes that need to be made are as follows PTO Max Engine Speed 2200 RPM PTO Standby Speed 800 RPM PTO Set Speed 1250 RPM PTO Resume Speed 1700 RPM PTO Max Engage Speed 1000 RPM PTO Shutdown NO PTO Engage Relay NO PTO Feedback NO NOTE If the reprogramming of the ECM is not performed the High Idle function will not work bulletin zyk 53 11 of 28 2 11 02 m UI BULLETIN 53 Cont d TTE HIGH IDLE PROCEDURE FOR C K 2500HD amp 3500 SERIES TRUCKS WITH 6 6L LB7 DIESEL ENGINE CON T To engage the High Idle set the Park Brake manual transmission only or put the truck in PARK automatic transmission only turn the switch to the ON position Move the PTO switch to the SET position or press the SET switch on the cruise control stalk if equipped The SET input ramps up the engine speed to 1250 RPM By pressing the cruise control RES ACC switch the engine speed will increase to the PTO Resume Speed setting and any SET input will decrease the engine speed to the PTO Set Speed setting If the truck does not have the cruise control option only the PTO Set Speed is available The PTO High Idle settings can only be changed with a Tech 2 scan tool The Tech 2 scan tool can be purchased from GM by calling 1 800 GM TOOLS The PTO accessory kit is available from your local GM dealer If any problems should arise check and clear any DTC s with a Tech 2 and make sure that the brake switch and tail lamps are functi
15. FF ON SET Additional PTO control is available if the vehicle is equipped with cruise control The Cruise Control stalk controls the following functions e PTO SET speed e PTO RESUME speed PTO INTERFACE CONNECTOR A PTO Interface connector is located on a bracket attached on the left hand side of the transmission above the left hand side PTO opening The PTO interface connector provides access to the following circuits for remote PTO operation PTO Engine Shut Down Light Blue PTO Remote Enable Switch Light Green Ground Black PTO Feedback Yellow PTO Relay Switch Control White Cruise Control SET Switch Input Dark Blue PTO OPERATING SPEED CONTROL Two PTO operating speed control modes are available with the 8 1L L18 gas and 6 6L LB7 diesel engines The PCM ECM may be programmed to one of the following modes e Preset Up to two preset PTO operating speeds e Variable Allows variable PTO speeds while vehicle is stationary or moving PTO ENGAGEMENT PTO engagement is controlled through the use of the in cab PTO control switch When PTO engagement i desired the user selects the ON position The PCM ECM then activates the PTO relay once proper operating criteria are met The fused PTO relay feed is accessible at the PTO interface connector discussed above PTO ENGINE SHUTDOWN Provisions are included in the PTO interface connector to allow for engine shut down while in the PTO operation mode This feature requires t
16. he Current PTO settings make any necessary changes and press the Reprogram Options key when done to complete the programming The values shown below are the default settings PTO Option Current PTO Settings PTO Fast Idle Option Preset PTO Max Engine Speed 2200 RPM PTO Standby Speed 800 RPM PTO Set Speed 1250 RPM PTO Resume Speed 1700 RPM PTO Max Engage Speed 1000 RPM PTO Engine Shutdown No PTO Engage Relay Yes PTO Feedback Yes bulletin zyk 53 27 of 28 2 11 02 m UI BULLETIN 53 Cont d CITIES PTO PROGRAMMING GUIDE CON T 12 The Current PTO settings screen will again be displayed Make sure that the changes made are shown on this screen If settings did not change repeat the procedure If settings are correct power down the Tech 2 and disconnect from the vehicle PTO Option Current PTO Settings PTO Fast Idle Option Preset PTO Max Engine Speed 2200 RPM PTO Standby Speed 800 RPM PTO Set Speed 1250 RPM PTO Resume Speed 1700 RPM PTO Max Engage Speed 1000 RPM PTO Engine Shutdown No PTO Engage Relay No PTO Feedback No bulletin zyk 53 28 of 28 2 11 02
17. he installation of a normally closed ground switch that when opened will shut down the engine This feature must be activated by a Tech II diagnostic tool bulletin zyk 53 4 of 28 2 11 02 m UI BULLETIN 53 Cont d CITIES PTO PRESET MODE FACTORY DEFAULT SETTING PTO Preset speed control mode is used for stationary applications This mode provides a default standby speed of 800 or 850 rpm depending on the engine transmission combina tion and two PTO control speeds PTO Set speed of 1250 rpm and PTO Resume speed of 1700 rpm Please note that the standby speed 800 850 rpm is not to be used as a PTO control speed Vehicles that are not equipped with cruise control will not have the Resume speed capability PARAMETERS SETTING RPM RPM RPM Speed LB7 950 LB7 3100 Normal engine idle will override if higher than PTO Standby RPM L18 800 850 requested PTO base LB7 800 800 idle PTO Max Engine PTO Set Speed PTO Standby Speed Speed Setting PTO Max Engine PTO Resume Speed PTO Set Speed Speed Setting PTO Max Engage PTO Max Engine PTO PRESET MODE FUNCTION CHART The following chart shows how to toggle between the two PTO speeds through the Cruise SET and RES switches Auto Manual PRESENT PTO STATE PRESSING RESULTING PTO STATE PTO Set Speed PTO Resume Speed PTO Resume Speed PTO Set Speed PTO Resume Speed PTO Standby Speed On L18 Gas Engines PTO Set must be selected prior to reques
18. oning correctly NOTE In certain cases the PTO wiring and connector will not be installed behind the passenger side air bag switch If this is the case the system will need to be hard wired into the ECM and a switch or switches no cruise control will need to be used Please call the Upfitter Integration Hotline at 1 800 875 4742 for more information bulletin zyk 53 12 of 28 2 11 02 m UI BULLETIN 53 Cont d CITIES PTO HIGH IDLE PROCEDURE FOR 3500HD 15 000 GVWR WITH 8 1L L18 GAS ENGINE High Idle can be obtained by using the 8 pin PTO connector behind the dash and the PTO accessory kit The PTO connector is located behind the dash near the Radio and Instrument cluster Connect the PTO switch to the PTO connector Mount the PTO switch on any available panel near the radio or below the HVAC controls The PTO switch does not have a specific mounting location like the GMT800 trucks The PTO interface wiring harness included with the PTO kit is not used on the 3500HD truck Connect the Tech 2 scan tool and reprogram the Powertrain Control Module PCM See the PTO Programming Guide section for instructions on how to get to the PTO programming screen Remember to program to either the Preset PTO or Variable PTO Mode when using the PTO switch The changes that need to be made are as follows PTO Max Engine Speed 2200 RPM PTO Standby Speed 800 RPM PTO Set Speed 1250 RPM PTO Resume Speed 1700 RPM PTO Max Engage Speed
19. t Information 12181085 80 Way F Micro Pack 100W Sealed NAT o Function Pin Wire Color Circuit No ECM Connector on 6 6L Diesel Engine Note Both connectors are used on the 6 6L engine A Connector Part Information 12191489 80 Way F Micro Pack 100W Sealed NAT Pin Wire Color Circuit No Function 1 C1 LT GRN 488 Power Take Off Enable Switch 3 C2 YEL 2522 Power Take Off Status Feedback LT BLU High Idle Switch Signal NA on Diesel Engine Power Take Off Engine Shutdown Signal 7 C2 2562 Power Take Off Relay Engage bulletin zyk 53 22 of 28 2 11 02 m UI BULLETIN 53 Cont d CITIES PTO PROGRAMMING GUIDE This section shows how to get to the PTO options menu to reprogram the PCM ECM for PTO and or High Idle operation with the Tech 2 1 Connect the Tech 2 to the vehicle 2 Select the Diagnostics option from the Main menu Diagnostics Service Program ming System View Captured Data 3 Select the Model Year from the Vehicle ID menu Vehicle ID Model Year bulletin zyk 53 23 of 28 2 11 02 m UI BULLETIN 53 Cont d CITIES PTO PROGRAMMING GUIDE CON T 4 Select the LD Truck MPV Incomplete option from the Vehicle ID menu Vehicle Identification Passenger Car LD Truck MPV Incomplete Medium Duty Truck Saturn 5 Select the Powertrain option from the System Selection menu S
20. ting PTO Resume Speed bulletin zyk 53 5 of 28 2 11 02 m UI BULLETIN 53 Cont d CITIES PTO PRESET MODE CON T PTO ENGAGE CONDITIONS FOR PTO PRESET MODE To engage the PTO the following conditions must be met Engine must be running Transmission must be in park or neutral Park Brake must be set for Manual Transmission only Vehicle speed must be zero Brake or Clutch must not be depressed PROCEDURE FOR ENGAGING PTO WITH MANUAL TRANSMISSION 1 Set parking brake 2 Shift the transmission into neutral N 3 Turn the PTO switch to the ON position The engine speed will increase to the PTO Standby Speed The PTO is engaged when the LED on the PTO Control switch changes from blinking to steady state 4 Press either the SET or RESUME switch on the cruise control or turn the PTO switch to the SET position The engine speed will jump to the PTO SET or RESUME speeds PROCEDURE FOR ENGAGING PTO WITH AUTOMATIC TRANSMISSION 1 Shift the transmission into Park P 2 Turn the PTO switch to the ON position The engine speed will increase to the PTO Standby Speed The PTO is engaged when the LED on the PTO Control switch changes from blinking to steady state 3 Press either the SET or RESUME switch on the cruise control or turn the PTO switch to the SET position The engine speed will jump to the PTO SET or RESUME speeds Torque Converter Clutch TCC lockup is not available in Neutral TCC lockup is available in Park
21. type switch The Fast Idle option is available on the 8 1L L18 Gas engine only bulletin zyk 53 2 of 28 2 11 02 m UI BULLETIN 53 Cont d CITIES PTO INFORMATION RPO MiF OPTION RPO MIF is a forced option that provides for PTO mounting space for transmission mounted PTO s PTO mounting space is for the right hand side of the transmission RPO MIF includes the following Revised Underbody Structure RH side Unique Front Floor Cover Panel RH side contoured to allow for PTO mounting RPO PTO OPTION RPO PTO is a forced option on C K 3600 trucks with L18 or LB7 engines that provides en gine speed and PTO engagement controls RPO PTO includes the following PTO control software in the Powertrain Control Module PCM on the gas engine and in the Engine Control Module ECM on the diesel engine Wiring provisions for in cab PTO Control switch Upfitter PTO Interface Connector which is located at the left side of the transmission This connector provides access to PTO engage feedback and engine shut down circuits as well as remote access to PTO SET switch GM APPROVED PTO KITS Two North American PTO suppliers Chelsea Auxiliary Power Products and Muncie Power Products offer the PTO installation kits The kits are designed specifically for the C K 3600 trucks The PTO kits in addition to normal PTO content include plumbing heat shields PTO control switch and PTO interface wiring harness
22. witch input is available on all GM trucks with the 8 1L L18 Gas engine The fast idle switch input is not available for the 6 6L LB7 Diesel engine NOTE The use of the fast idle switch is not recommended if any type of hydraulic application is intended AA 1 Powertrain PR D WILL High Contra n3 ie Modula i Sw ch p POM mpm 3 81 C1 0 8 DE GAN 534 P100 S250 4 mac C7 c20D 0 8 BLAAWHT 451 Lj cain 0 8 BLEAVHT 451 em P101 5142 4 Ben 0 5 BLK VZHT 431 1 BLEAVHT 481 bulletin zyk 53 15 of 28 2 11 02 CITIES FAST IDLE SWITCH INSTALLATION ON 8 1L L18 GAS ENGINE CON T m UI BULLETIN 53 Cont d Procedure for Fast Idle Operation on 8 1L L18 Gas Engine 1 Reprogram the PCM using the Tech 2 See the PTO Programming Guide section for instructions on how to get to the PTO programming screen a Reprogram to the Fast Idle Mode by pressing the Change Options key and selecting PTO Fast Idle Mode b Scroll down and change the PTO Feedback and PTO Engage relay settings to NO e If more than 1250 rpm is required change the PTO Standby Speed setting Follow the schematic on the previous page and hardwire into pin 31 of the Blue connector in the PCM a By momentarily grounding pin 31 the engine idle will increase to the PTO Standby Speed setting b Momentarily grounding pin 31 again will cancel the Fast Idle
23. ystem Selection Menu 200 LD Truck MPV Incomplete FO Powertrain F1 Body F2 Chassis F3 Diagnostic Circuit Check bulletin zyk 53 24 of 28 2 11 02 m UI BULLETIN 53 Cont d CITIES PTO PROGRAMMING GUIDE CON T 6 Select the Engine type from the Vehicle ID menu Vehicle ID Select one of the following LT Duty Truck Engine types 1 V8 LB7 Diesel G V8 L18 G V8 L18 3500HD 7 Select the Transmission type from the Vehicle ID menu Vehicle Identification Select one of the following Transmissions 5 Speed Automatic Trans M74 4 Speed Automatic Trans MT1 ManualTrans ML6 Other bulletin zyk 53 25 of 28 2 11 02 m UI BULLETIN 53 Cont d CITIES PTO PROGRAMMING GUIDE CON T 8 Select the Special Functions option from the Powertrain menu Powertrain Data Display Special Functions Snapshot 9 Select the PTO options from the Special Functions menu The Current PTO settings screen will be displayed Special Functions Service Bay Test PTO Options Engine Shutdown bulletin zyk 53 26 of 28 2 11 02 m UI BULLETIN 53 Cont d CITIES PTO PROGRAMMING GUIDE CON T 10 Press the Change Options key and then select the desired PTO Operating Mode Refer to pages 3 9 for PTO mode information PTO Option FO Fast Idle Option N A on 6 6L Diesel F1 Preset PTO Speed Control F2 Variable PTO Speed Control 11 Scroll through t
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