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 MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM & COMPONENT TESTSCOMPUTERIZED ENGINE CONTROLSPOWERTRAIN CONTROL MODULE (PCM) CONNECTOR TERMINAL IDENTIFICATIONPOWERTRAIN CONTROL MODULE (PCM) - 6.5L ("P" SERIES)
1999 GMC Forward Control 5.7 R, Automatic
Powertrain Control Module (Pcm) - 6.5L ("P" Series)
1999 GMC Forward Control 5.7 R, AutomaticSECTION Powertrain Control Module (Pcm) - 6.5L ("P" Series)
POWERTRAIN CONTROL MODULE (PCM) - 6.5L ("P" SERIES) (1)
| Connector | Terminal | Wire Color | Function | ||
|---|---|---|---|---|---|
| C1 (Brown) | C1 | PPL | Crankshaft Position Sensor Ground | ||
| C1 (Brown) | C2 | DK GRN/WHT | A/C Request Signal | ||
| C1 (Brown) | C3 | ..... | Not Used | ||
| C1 (Brown) | C4 | TAN | Intake Air Temperature Signal | ||
| C1 (Brown) | C5 | LT BLU | Accelerator Pedal Position 2 Signal | ||
| C1 (Brown) | C6 | YEL | Glow Plug Relay Control | ||
| C1 (Brown) | C7 | RED/BLK | Pressure Control Solenoid Valve High | ||
| C1 (Brown) | C8 | YEL | Fuel Temperature Signal | ||
| C1 (Brown) | C9 | YEL/BLK | Transmission Fluid Temperature Sensor Signal | ||
| C1 (Brown) | C10 | ..... | Not Used | ||
| C1 (Brown) | C11 | YEL | Engine Coolant Temperature Signal | ||
| C1 (Brown) | C12 | ..... | Not Used | ||
| C1 (Brown) | C13 | RED | Closure Signal | ||
| C1 (Brown) | C14 | LT GRN | Boost Sensor Signal | ||
| C1 (Brown) | C15 | LT BLU/WHT | Pressure Control Solenoid Valve Low | ||
| C1 (Brown) | C16 | ..... | Not Used | ||
| C1 (Brown) | D1 | BLU/WHT | Transmission Input Speed Signal Low | ||
| C1 (Brown) | D2 | ..... | Not Used | ||
| C1 (Brown) | D3 | YEL/BLK | Accelerator Pedal Position 3 Reference Voltage | ||
| C1 (Brown) | D4 | DK GRN | Accelerator Pedal Position 3 Signal | ||
| C1 (Brown) | D5 | GRY | Fuel Lift Pump Signal | ||
| C1 (Brown) | D6 | GRY | Accelerator Pedal Position 3 Ground | ||
| C1 (Brown) | D7 | BRN | Glow Plug Signal | ||
| C1 (Brown) | D8 | DK GRN/WHT | Fuel Pump Relay Control | ||
| C1 (Brown) | D9 | PNK/BLK | Sensor Ground (Pump CAM, High Res. & Fuel Temp.) | ||
| C1 (Brown) | D10 | GRY/BLK | Cruise Control Resume/Accel Signal | ||
| C1 (Brown) | D11 | RED/BLK | Transmission Input Speed Signal High | ||
| C1 (Brown) | D12 | WHT/BLK | Accelerator Pedal Position 1 Reference Voltage | ||
| C1 (Brown) | D13 | GRY | Sensor Reference Voltage (Boost & CKP) | ||
| C1 (Brown) | D14 | GRY | Sensor Reference Voltage (Pump CAM & High Res.) | ||
| C1 (Brown) | D15 & D16 | ..... | Not Used | ||
| C2 (Brown) | A1 | BLK | Closure Ground | ||
| C2 (Brown) | A2 | ORG | High Res. Signal | ||
| C2 (Brown) | A3 | BRN | Transmission Output Speed Signal | ||
| C2 (Brown) | A4 | BRN/WHT | Pump CAM Sensor Signal | ||
| C2 (Brown) | A5 | YEL | CKP Sensor Signal | ||
| C2 (Brown) | A6 | DK GRN/WHT | Vehicle Speed Sensor Signal | ||
| C2 (Brown) | A7 | RED/BLK | Injection Timing Stepper Motor High Coil 1 | ||
| C2 (Brown) | A8 | TAN/BLK | Injection Timing Stepper Motor Low Coil 1 | ||
| C2 (Brown) | A9 | ORG/BLK | Injection Timing Stepper Motor Low Coil 2 | ||
| C2 (Brown) | A10 | YEL/BLK | Injection Timing Stepper Motor High Coil 2 | ||
| C2 (Brown) | A11 | GRY | Cruise Control On/Off Signal | ||
| C2 (Brown) | A12 | PPL | Accelerator Pedal Position 2 Ground | ||
| C2 (Brown) | B1 | BRN | Accelerator Pedal Position 1 Ground | ||
| C2 (Brown) | B2 | DK BLU | Accelerator Pedal Position 1 Signal | ||
| C2 (Brown) | B3 | ..... | Not Used | ||
| C2 (Brown) | B4 | RED | Transmission Range Switch C Input | ||
| C2 (Brown) | B5 | DK BLU | Transmission Range Switch B Input | ||
| C2 (Brown) | B6 | PNK | Transmission Range Switch A Input | ||
| C2 (Brown) | B7 & B8 | ..... | Not Used | ||
| C2 (Brown) | B9 | PPL | TCC/ABS Brake Switch Signal | ||
| C2 (Brown) | B10 | LT BLU | Brakelight Switch Signal | ||
| C2 (Brown) | B11 | DK BLU | Cruise Set/Coast Signal | ||
| C2 (Brown) | B12 | BLK | Sensor Ground (Boost, ECT, IAT & TFT) | ||
| C3 (Blue) | C1 | ..... | Not Used | ||
| C3 (Blue) | C2 | TAN | Accelerator Pedal Position 2 Reference Voltage | ||
| C3 (Blue) | C3 | LT GRN | Fuel Injection Control | ||
| C3 (Blue) | C4 | LT GRN | 1-2 Shift Solenoid Signal | ||
| C3 (Blue) | C5 | BRN | TCC PWM Solenoid | ||
| C3 (Blue) | C6 | YEL/BLK | 2-3 Shift Solenoid Signal | ||
| C3 (Blue) | C7 | DK BLU | Wait To Start Light Control | ||
| C3 (Blue) | C8 | PPL | Class II Communication | ||
| C3 (Blue) | C9 & C10 | ..... | Not Used | ||
| C3 (Blue) | C11 | PNK | Ignition Voltage | ||
| C3 (Blue) | C12 | PNK | Ignition Voltage | ||
| C3 (Blue) | C13 | ORG | Battery Voltage | ||
| C3 (Blue) | C14 | BRN/WHT | MIL Control | ||
| C3 (Blue) | C15 | DK BLU/WHT | Engine Shutoff Control | ||
| C3 (Blue) | C16 | ..... | Not Used | ||
| C3 (Blue) | D1-D4 | ..... | Not Used | ||
| C3 (Blue) | D5 | DK GRN/WHT | A/C Enable Signal | ||
| C3 (Blue) | D6 | BLK/WHT | PCM Ground | ||
| C3 (Blue) | D7 | BLK/WHT | PCM Ground | ||
| C3 (Blue) | D8-D10 | ..... | Not Used | ||
| C3 (Blue) | D11 | WHT/BLK | Service Throttle Soon Light Control | ||
| C3 (Blue) | D12 | ..... | Not Used | ||
| C3 (Blue) | D13 | ORG | Battery Voltage | ||
| C3 (Blue) | D14 | YEL | Wastegate Solenoid Control | ||
| C3 (Blue) | D15 & 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.