GMC Cab & Chassis C3500 (1985-2000) ignition bypass Wiring diagrams

452 455 PPL A/C ON SIGNAL IN BRAKE SW TO PCM AIR CONDITION- ING SYSTEM BLK WIRE BLK/RED WIRE BLK/WHT WIRE BLK/YEL WIRE BRN WIRE BRN/WHT WIRE COOLANT TEMP. SENSOR CRUISE CONTROL SYSTEM CRUISE IND REG GRD DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE DK GRN/YEL WIRE DLC THROTTLE POSITION SENSOR IN LO SIDE INJ A ECM IGN FUSE EGR ELECTRONIC VACUUM REGULATOR SOLENOID VALVE (4.3L W/NRQ, A/T OR 5.7L EGR VALVE SOLENOID EGR VALVE SOLENOID TRANS SHIFT 3/2 SOLENOID ELEC FUEL PUMP IN MAP SENSOR IN ENGINE CONTROL MODULE (UNDER RIGHT SIDE OF I/P) EVAP CANISTER PURGE CTRL EVAPORATIVE CANISTER PURGE SOLENOID FUEL PUMP RELAY CTRL PCM TRANS FORCE MTR LO FUSE BLOCK GRY WIRE GRY/RED WIRE HOT IN RUN OR START HOT IN RUN, BULB TEST OR START IDLE AIR CONTROL UNIT (RIGHT REAR OF TBI UNIT) IGNITION BYPASS INJ FUSE KNOCK SENSOR IN LT BLU/BLK WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE LT GRN/WHT WIRE ORG/ WIRE ORG/BLK WIRE OXYGEN SENSOR LO PCM TO TRANS TEMP SENSOR PCM TRANS RANGE A TRANS INPUT SPEED IN HI TRANS INPUT SPEED IN LO PCM TRANS RANGE B PCM TRANS RANGE C MIL INDICATOR CTRL PCM TRANS SHIFT SOL B PCM TRANS SHIFT SOL A PNK 25 26 27 WIRE PNK WIRE PNK/BLK WIRE PPL PPL 1 2 3 4 PPL 22 23 PPL/WHT WIRE RED WIRE RED/BLK WIRE SYSTEM GROUND TAN WIRE TAN/BLK WIRE TCC CLUTCH CTRL TCC CLUTCH CTRL THROTTLE BODY FUEL INJECTOR #1 (TOP OF THROTTLE BODY UNIT) THROTTLE BODY FUEL INJECTOR #2 (TOP OF THROTTLE BODY UNIT) TRANSMISSION INPUT SHAFT SPEED SENSOR WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE YUKON, SUBURBAN ONLY

4.3L ONLY 452 455 PPL 7.4L ONLY A/C ON SIGNAL IN BRAKE SW TO PCM AIR CONDITIONING SYSTEM BLK WIRE BLK/RED WIRE BLK/WHT WIRE BRN WIRE BRN/WHT WIRE COOLANT TEMP. SENSOR CRUISE CONTROL SYSTEM CRUISE IND REG GRD DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE DK GRN/YEL WIRE DLC SERIAL DATA DLC THROTTLE POSITION SENSOR IN LO SIDE INJ A ECM IGN FUSE EGR VALVE SOLENOID (4.3L ONLY) (LEFT REAR TOP OF ENGINE) EGR VALVE SOLENOID UPSHIFT IND CTRL ELEC FUEL PUMP IN MAP SENSOR IN ENGINE CONTROL MODULE (UNDER RIGHT SIDE OF I/P) EVAP CANISTER PURGE CTRL EVAPORATIVE CANISTER PURGE SOLENOID (ON ENGINE) FUEL PUMP RELAY CTRL FUSE BLOCK GRY WIRE HOT IN RUN OR START HOT IN RUN, BULB TEST OR START IDLE AIR CONTROL UNIT (RIGHT REAR OF TBI UNIT) IGNITION BYPASS IGNITION CONTROL (IC) VSS BUFFER SIGNAL VSS BUFFER SIGNAL INJ FUSE KNOCK SENSOR IN LINEAR EGR POSITION IN LT BLU/BLK WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE LT GRN/WHT WIRE MIL INDICATOR CTRL ORG/ WIRE ORG/BLK WIRE OXYGEN SENSOR LO PNK/BLK WIRE PPL PPL 1 2 3 4 PPL 18 19 PPL/WHT WIRE RED WIRE TAN WIRE TAN/BLK WIRE TAN/WHT WIRE THROTTLE ACTUATOR CTRL THROTTLE BODY FUEL INJECTOR #1 (TOP OF THROTTLE BODY UNIT) THROTTLE BODY FUEL INJECTOR #2 (TOP OF THROTTLE BODY UNIT) WHT WIRE WHT/BLK WIRE YEL WIRE

452 455 PPL A/C ON SIGNAL IN BRAKE SW TO PCM AIR CONDITION- ING SYSTEM BLK WIRE BLK/RED WIRE BLK/WHT WIRE BLK/YEL WIRE BRN WIRE BRN/WHT WIRE COOLANT TEMP. SENSOR CRUISE CONTROL SYSTEM CRUISE IND REG GRD DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE DK GRN/YEL WIRE DLC THROTTLE POSITION SENSOR IN LO SIDE INJ A ECM IGN FUSE EGR ELECTRONIC VACUUM REGULATOR SOLENOID VALVE (4.3L W/NRQ, A/T OR 5.7L EGR VALVE SOLENOID EGR VALVE SOLENOID TRANS SHIFT 3/2 SOLENOID ELEC FUEL PUMP IN MAP SENSOR IN ENGINE CONTROL MODULE (UNDER RIGHT SIDE OF I/P) EVAP CANISTER PURGE CTRL EVAPORATIVE CANISTER PURGE SOLENOID FUEL PUMP RELAY CTRL PCM TRANS FORCE MTR LO FUSE BLOCK GRY WIRE GRY/RED WIRE HOT IN RUN OR START HOT IN RUN, BULB TEST OR START IDLE AIR CONTROL UNIT (RIGHT REAR OF TBI UNIT) IGNITION BYPASS INJ FUSE KNOCK SENSOR IN LT BLU/BLK WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE LT GRN/WHT WIRE ORG/ WIRE ORG/BLK WIRE OXYGEN SENSOR LO PCM TO TRANS TEMP SENSOR PCM TRANS RANGE A TRANS INPUT SPEED IN HI TRANS INPUT SPEED IN LO PCM TRANS RANGE B PCM TRANS RANGE C MIL INDICATOR CTRL PCM TRANS SHIFT SOL B PCM TRANS SHIFT SOL A PNK 25 26 27 WIRE PNK WIRE PNK/BLK WIRE PPL PPL 1 2 3 4 PPL 22 23 PPL/WHT WIRE RED WIRE RED/BLK WIRE SYSTEM GROUND TAN WIRE TAN/BLK WIRE TCC CLUTCH CTRL TCC CLUTCH CTRL THROTTLE BODY FUEL INJECTOR #1 (TOP OF THROTTLE BODY UNIT) THROTTLE BODY FUEL INJECTOR #2 (TOP OF THROTTLE BODY UNIT) TRANSMISSION INPUT SHAFT SPEED SENSOR WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE YUKON, SUBURBAN ONLY

4.3L W/ A/C ON SIGNAL IN BRAKE SW TO PCM AIR CONDITION- ING SYSTEM BLK WIRE BLK/WHT WIRE BRN WIRE BRN/WHT WIRE COOLANT TEMP. SENSOR CRUISE CONTROL SYSTEM CRUISE IND REG GRD DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE DLC THROTTLE POSITION SENSOR IN LO SIDE INJ A ECM-I MINI FUSE EGR VALVE SOLENOID (4.3/5.0/5.7L EGR VALVE SOLENOID TRANS SHIFT 3/2 SOLENOID ELEC FUEL PUMP IN MAP SENSOR IN EMISSIONS) (RIGHT SIDE OF ENGINE) ENG-I MINI FUSE EVAP CANISTER PURGE CTRL EVAPORATIVE CANISTER PURGE SOLENOID (5.0, 5.7L W/ 4L60E, 4.3L W/ FUEL PUMP RELAY CTRL PCM TRANS FORCE MTR LO GRY WIRE GRY/BLK WIRE HOT IN RUN OR START IDLE AIR CONTROL UNIT (RIGHT REAR OF TBI UNIT) IGNITION BYPASS KNOCK SENSOR IN PINTLE POSITION SIGNAL LT BLU/BLK WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE LT GRN/WHT WIRE ORG/ WIRE OXYGEN SENSOR LO PCM TO TRANS TEMP SENSOR PCM TRANS RANGE A TRANS INPUT SPEED IN HI TRANS INPUT SPEED IN LO PCM TRANS RANGE B PCM TRANS RANGE C MIL INDICATOR CTRL PCM TRANS SHIFT SOL B PCM TRANS SHIFT SOL A PNK WIRE POWERTRAIN CONTROL MODULE (UNDER RIGHT SIDE OF I/P) PPL PPL 1 2 3 4 PPL 23 24 PPL/WHT WIRE RED WIRE RED/BLK WIRE TAN WIRE TAN/BLK WIRE TAN/WHT WIRE TCC CLUTCH CTRL TCC CLUTCH CTRL THROTTLE BODY FUEL INJECTOR #1 (TOP OF THROTTLE BODY UNIT) THROTTLE BODY FUEL INJECTOR #2 (TOP OF THROTTLE BODY UNIT) TRANSMISSION INPUT SHAFT SPEED SENSOR TRANSMISSIONS SYSTEM UNDERHOOD FUSE/RELAY CENTER (LEFT REAR OF ENGINE COMPT) WHT DK GRN/ WIRE WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE

AIR CONDITION- ING SYSTEM BLK WIRE BLK/WHT WIRE BRN WIRE BRN/WHT WIRE COOLANT TEMP. SENSOR DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE DLC THROTTLE POSITION SENSOR IN LO SIDE INJ A EGR VALVE SOLENOID ELEC FUEL PUMP IN MAP SENSOR IN ENG-I MINI FUSE EVAP CANISTER PURGE CTRL EVAPORATIVE CANISTER PURGE SOLENOID (RIGHT SIDE OF ENGINE) FUEL PUMP RELAY CTRL PCM TRANS FORCE MTR LO GRY WIRE GRY/BLK WIRE HOT IN RUN OR START IDLE AIR CONTROL UNIT (RIGHT REAR OF TBI UNIT) IGNITION BYPASS KNOCK SENSOR IN LINEAR EGR POSITION IN LINEAR EGR REGULATOR SOLENOID VALVE (LEFT REAR OF ENGINE) LT BLU/BLK WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE LT GRN/WHT WIRE ORG/ WIRE OXYGEN SENSOR LO PCM TO TRANS TEMP SENSOR PCM TRANS RANGE A TRANS INPUT SPEED IN HI TRANS INPUT SPEED IN LO PCM TRANS RANGE B PCM TRANS RANGE C MIL INDICATOR CTRL PCM TRANS SHIFT SOL B PCM TRANS SHIFT SOL A PNK PNK PNK 25 26 27 WIRE PNK WIRE POWERTRAIN CONTROL MODULE (UNDER RIGHT SIDE OF I/P) PPL PPL 1 2 3 4 PPL 22 23 PPL/WHT WIRE RED WIRE RED/BLK WIRE TAN WIRE TAN/BLK WIRE TAN/WHT WIRE THROTTLE ACTUATOR SOL CTRL TCC CLUTCH CTRL A/C ON SIGNAL IN BRAKE SW TO PCM THROTTLE BODY FUEL INJECTOR #1 (TOP OF THROTTLE BODY UNIT) THROTTLE BODY FUEL INJECTOR #2 (TOP OF THROTTLE BODY UNIT) TRANSMISSION INPUT SHAFT SPEED SENSOR (LEFT SIDE OF TRANS- MISSION) TRANSMISSIONS SYSTEM WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE

7.4L ONLY A/C ON SIGNAL IN AIR CONDITION- ING SYSTEM BLK WIRE BLK/WHT WIRE BRN WIRE BRN/WHT WIRE COOLANT TEMP. SENSOR CRUISE CONTROL SYSTEM CRUISE IND REG GRD DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE DLC SERIAL DATA DLC THROTTLE POSITION SENSOR IN LO SIDE INJ A ECM-I MINI FUSE EGR VALVE SOLENOID (4.3L ONLY) (RIGHT SIDE OF ENGINE) EGR VALVE SOLENOID SHIFT LAMP CONTROL ELEC FUEL PUMP IN MAP SENSOR IN ENG-I MINI FUSE EVAP CANISTER PURGE CTRL EVAPORATIVE CANISTER PURGE SOLENOID (7.4L ONLY) (RIGHT SIDE OF ENGINE) FUEL PUMP RELAY CTRL GRY WIRE HOT IN RUN OR START IDLE AIR CONTROL UNIT (RIGHT REAR OF TBI UNIT) IDLE SPEED CONTROL IGNITION BYPASS IGNITION CONTROL (IC) VSS BUFFER SIGNAL VSS BUFFER SIGNAL KNOCK SENSOR IN PINTLE POSITION SIGNAL LT BLU/BLK WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE LT GRN/WHT WIRE MIL INDICATOR CTRL ORG/ WIRE OXYGEN SENSOR LO PNK WIRE POWERTRAIN CONTROL MODULE (UNDER RIGHT SIDE OF I/P) PPL PPL 1 2 3 4 PPL/WHT WIRE RED/BLK WIRE TAN WIRE TAN/BLK WIRE TAN/WHT WIRE THROTTLE BODY FUEL INJECTOR #1 (TOP OF THROTTLE BODY UNIT) THROTTLE BODY FUEL INJECTOR #2 (TOP OF THROTTLE BODY UNIT) UNDERHOOD FUSE/RELAY CENTER (LEFT REAR OF ENGINE COMPT) WHT DK GRN/ WIRE WHT WIRE WHT/BLK WIRE YEL WIRE