Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1997CHEVY EXPRESS G3500, VAN CARGO, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 101 (ENGINE CONTROLS - SYSTEM & COMPONENT TESTING - 6.5L TURBO DIESEL)COMPUTERIZED ENGINE CONTROLSCONTROL UNITPCM HARNESS RESISTANCE
1997 Chevrolet Chevy Express G3500, Van Cargo, 6.5 F
PCM Harness Resistance
1997 Chevrolet Chevy Express G3500, Van Cargo, 6.5 FSECTION PCM Harness Resistance
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 1998 GMC Savana Special, 1998 GMC Savana Camper Special, 1998 GMC Savana, 1998 Chevrolet RV Cutaway, and 1998 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
Turn ignition switch to LOCK position. Disconnect PCM and appropriate component harness connectors. Check for open or short circuits between appropriate PCM harness connector terminal and appropriate component harness connector terminal. See POWERTRAIN CONTROL MODULE (PCM) table. See WIRING DIAGRAMS. If harness is open or shorted, repair as necessary.
POWERTRAIN CONTROL MODULE (PCM) (1)
| Connector | Terminal | Wire Color | Function | ||
|---|---|---|---|---|---|
| C1 | C1 | ***** | Not Used | ||
| C1 | C2 | DK GRN/WHT | A/C Request Signal | ||
| C1 | C3 | YEL | Mass Airflow Signal | ||
| C1 | C4 | TAN | Intake Air Temperature Signal | ||
| C1 | C5 | LT BLU | Accelerator Pedal Position (2) Signal | ||
| C1 | C6 | YEL | Glow Plug Relay Control | ||
| C1 | C7 | RED/BLK | Pressure Control Solenoid Valve High | ||
| C1 | C8 | YEL | Fuel Temperature Signal | ||
| C1 | C9 | YEL/BLK | Transmission Fluid Temperature Sensor | ||
| C1 | C10 | ***** | Not Used | ||
| C1 | C11 | YEL | Engine Coolant Temperature Signal | ||
| C1 | C12 | GRY/BLK | EGR Control Pressure/BARO Signal | ||
| C1 | C13 | RED | Closure Signal | ||
| C1 | C14 | LT GRN | Boost Sensor Signal | ||
| C1 | C15 | LT BLU/WHT | Pressure Control Solenoid Valve Low | ||
| C1 | C16 | ***** | Not Used | ||
| C1 | D1 | BLU/WHT | Transmission Input Speed Signal Low | ||
| C1 | D2 | GRY/BLK | 4WD Low Indicator Signal | ||
| C1 | D3 | YEL/BLK | Accelerator Pedal Position (3) Reference Voltage | ||
| C1 | D4 | DK GRN | Accelerator Pedal Position (3) Signal | ||
| C1 | D5 | GRY | Fuel Lift Pump Signal | ||
| C1 | D6 | GRY | Accelerator Pedal Position (3) Ground | ||
| C1 | D7 | BRN | Glow Plug Signal | ||
| C1 | D8 | DK GRN/WHT | Fuel Lift Pump Control | ||
| C1 | D9 | PNK/BLK | Sensor Ground | ||
| C1 | D10 | GRY/BLK | Cruise Resume/Accel Signal | ||
| C1 | D11 | RED/BLK | Transmission Input Speed Signal High | ||
| C1 | D12 | WHT/BLK | Accelerator Pedal Position (1) Reference Voltage | ||
| C1 | D13 | GRY | Boost, CKP & EGR Sensor Reference Voltage | ||
| C1 | D14 | GRY | Pump CAM Reference Voltage | ||
| C1 | D15 | ***** | Not Used | ||
| C1 | D16 | ***** | Not Used | ||
| C2 | A1 | BLK | Closure Ground | ||
| C2 | A2 | ORG | Fuel Temp. Sensor High Resolution Signal | ||
| C2 | A3 | BRN | Transmission Input Speed Signal | ||
| C2 | A4 | BRN/WHT | Injection Pump CAM Sensor Signal | ||
| C2 | A5 | YEL | CKP Sensor Signal | ||
| C2 | A6 | DK GRN | Vehicle Speed Sensor Signal | ||
| C2 | A7 | RED/BLK | Injection Timing Stepper Motor High | ||
| C2 | A8 | TAN/BLK | Injection Timing Stepper Motor Low | ||
| C2 | A9 | ORG/BLK | Injection Timing Stepper Motor Low | ||
| C2 | A10 | YEL/BLK | Injection Timing Stepper Motor High | ||
| C2 | A11 | GRY | Cruise Control On/Off Signal | ||
| C2 | A12 | PPL | Accelerator Pedal Position (2) Ground | ||
| C2 | B1 | BRN | Accelerator Pedal Position (1) Ground | ||
| C2 | B2 | DK BLU | Accelerator Pedal Position (1) Signal | ||
| C2 | B3 | BLK/WHT | Front Axle Switch Signal | ||
| C2 | B4 | RED | Transmission Range Switch C Signal | ||
| C2 | B5 | DK BLU | Transmission Range Switch B Signal | ||
| C2 | B6 | PNK | Transmission Range Switch A Signal | ||
| C2 | B7 | ***** | Not Used | ||
| C2 | B8 | ***** | Not Used | ||
| C2 | B9 | PPL | Brake Switch Signal | ||
| C2 | B10 | WHT | Brake Switch Signal | ||
| C2 | B11 | DK BLU | Cruise Set/Coast Signal | ||
| C2 | B12 | BLK | IAT, Boost, ECT & TFT Sensor Grounds | ||
| C3 | C1 | ***** | Not Used | ||
| C3 | C2 | TAN | Accelerator Pedal Position (2) Reference Voltage | ||
| C3 | C3 | LT GRN | Fuel Injection Control | ||
| C3 | C4 | LT GRN | 1-2 Shift Solenoid Signal | ||
| C3 | C5 | BRN | TCC PWM Solenoid | ||
| C3 | C6 | YEL/BLK | 2-3 Shift Solenoid Signal | ||
| C3 | C7 | DK BLU | Wait To Start Light Control | ||
| C3 | C8 | PPL | Class 2 Communication | ||
| C3 | C9 | ***** | Not Used | ||
| C3 | C10 | ***** | Not Used | ||
| C3 | C11 | PNK | Ignition Voltage | ||
| C3 | C12 | PNK | Ignition Voltage | ||
| C3 | C13 | ORG | Battery Voltage | ||
| C3 | C14 | BRN/WHT | MIL Control | ||
| C3 | C15 | DK BLU/WHT | Engine Shut-Off Control | ||
| C3 | C16 | GRY | EGR Solenoid Control | ||
| C3 | D1 | ***** | Not Used | ||
| C3 | D2 | ***** | Not Used | ||
| C3 | D3 | LT GRN | Fuel Injection Control | ||
| C3 | D4 | ***** | Not Used | ||
| C3 | D5 | DK GRN/WHT | A/C Enable Signal | ||
| C3 | D6 | BLK/WHT | Ground | ||
| C3 | D7 | TAN/WHT | Ground | ||
| C3 | D8 | ***** | Not Used | ||
| C3 | D9 | ***** | Not Used | ||
| C3 | D10 | ***** | Not Used | ||
| C3 | D11 | WHT/BLK | Service Throttle Soon Light Control | ||
| C3 | D12 | WHT | EGR Vent Control | ||
| C3 | D13 | ORG | Battery Voltage | ||
| C3 | D14 | YEL | Wastegate Solenoid Control | ||
| C3 | D15 | DK BLU/WHT | Engine Shut-Off Solenoid Control | ||
| C3 | D16 | ***** | Not Used | ||
|
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.