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 MANUALSBUICK1999REGAL LSREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - SYSTEM TESTING & ENGINE COMPONENT TESTSCOMPUTERIZED ENGINE CONTROLSPOWERTRAIN CONTROL MODULE (PCM) CONNECTOR TERMINAL IDENTIFICATIONPOWERTRAIN CONTROL MODULE (PCM) CONNECTOR TERMINAL IDENTIFICATION (3.8L - CAMARO & FIREBIRD)
1999 Buick Regal LS
Powertrain Control Module (Pcm) Connector Terminal Identification (3.8L - CAMARO & Firebird)
1999 Buick Regal LSSECTION Powertrain Control Module (Pcm) Connector Terminal Identification (3.8L - CAMARO & Firebird)
POWERTRAIN CONTROL MODULE (PCM) CONNECTOR TERMINAL IDENTIFICATION (3.8L - CAMARO & FIREBIRD) (1)
| Connector | Terminal No. | Wire Color | Function | ||
|---|---|---|---|---|---|
| C1 | 1 | ..... | Not Used | ||
| C1 | 2 | PPL/WHT | 2nd Gear Start Indicator (4L60E Only) | ||
| C1 | 3 | ..... | Not Used | ||
| C1 | 4 | LT GRN | 1-2 Shift Solenoid Control | ||
| C1 | 5 | DK BLU | Cooling Fan High Speed Control | ||
| C1 | 6 | DK GRN | Cooling Fan Low Speed Control | ||
| C1 | 7 | BLK | Camshaft Position Sensor Signal | ||
| C1 | 8 | PPL/WHT | Crankshaft Position 3x Sensor Reference | ||
| C1 | 9 | LT BLU/BLK | Crankshaft Position 18x Sensor Reference | ||
| C1 | 10 & 11 | ..... | Not Used | ||
| C1 | 12 | BRN | Engine Coolant Temperature Sensor Ground | ||
| C1 | 13 | ORG/BLK | Manifold Absolute Pressure Sensor Ground | ||
| C1 | 14 | ORG/BLK | TAC Serial Data | ||
| C1 | 15 | TAN | TAC Serial Data | ||
| C1 | 16 | BLK/WHT | Powertrain Control Module Ground | ||
| C1 | 17 | PPL | Intake Air Temperature Sensor Ground | ||
| C1 | 18 | ..... | Not Used | ||
| C1 | 19 | PNK | Ignition Positive Voltage | ||
| C1 | 20 | ORG | Battery Positive Voltage | ||
| C1 | 21 | ..... | Not Used | ||
| C1 | 22 | PNK | Transmission Range "A" Input (4L60E Only) | ||
| C1 | 23-26 | ..... | Not Used | ||
| C1 | 27 | TAN/WHT | Heated Oxygen Sensor No. 1 Signal Low (Bank No. 1) | ||
| C1 | 28 | GRY | Heated Oxygen Sensor No. 3 Signal Low (Bank No. 1) | ||
| C1 | 29 | TAN | Heated Oxygen Sensor No. 1 Signal Low (Bank No. 2) | ||
| C1 | 30 | PPL | Torque Converter Clutch Brake Switch Signal (4L60E Only) | ||
| C1 | 31 | BLK | Sensor Ground (EGR) | ||
| C1 | 32 | GRY | EGR Valve Ground | ||
| C1 | 33 | DK BLU | Bank No. 1 Knock Sensor Signal | ||
| C1 | 34 | LT BLU | Bank No. 2 Knock Sensor Signal | ||
| C1 | 35-42 | ..... | Not Used | ||
| C1 | 43 | YEL/BLK | Fuel Injector No. 6 Control | ||
| C1 | 44 | YEL/BLK | 2-3 Shift Solenoid Control (4L60E Only) | ||
| C1 | 45 | ..... | Not Used | ||
| C1 | 46 | LT BLU/BLK | Fuel Injector No. 4 Control | ||
| C1 | 47 | BLK/WHT | Fuel Injector No. 5 Control | ||
| C1 | 48 | RED/BLK | Reference Low | ||
| C1 | 49-52 | ..... | Not Used | ||
| C1 | 53 | TAN/BLK | By-Pass Valve Control | ||
| C1 | 54 | WHT | Ignition Control | ||
| C1 | 55 | DK GRN/WHT | Vehicle Speed Sensor Output | ||
| C1 | 56 | BLK/WHT | Powertrain Control Module Ground | ||
| C1 | 57 | BLK/WHT | Powertrain Control Module Ground | ||
| C1 | 58 | ..... | Not Used | ||
| C1 | 59 | DK GRN | Serial Data (Class II) | ||
| C1 | 60 | BLK/WHT | Powertrain Control Module Ground | ||
| C1 | 61-63 | ..... | Not Used | ||
| C1 | 64 | YEL | Vehicle Speed Sensor High | ||
| C1 | 65 | PPL | Vehicle Speed Sensor Low | ||
| C1 | 66-68 | ..... | Not Used | ||
| C1 | 69 | YEL | Mass Airflow Signal | ||
| C1 | 70 | DK BLU | Theft Deterrent Fuel Enable | ||
| C1 | 71 | ORG/BLK | Requested Torque Input | ||
| C1 | 72 | ..... | Not Used | ||
| C1 | 73 | LT GRN/BLK | Fuel Injector No. 2 Control | ||
| C1 | 74 & 75 | ..... | Not Used | ||
| C1 | 76 | DK GRN | EVAP Canister Purge Control | ||
| C1 | 77 & 78 | ..... | Not Used | ||
| C1 | 79 | BLK | Fuel Injector No. 1 Control | ||
| C1 | 80 | ..... | Not Used | ||
| C2 | 1 | ..... | Not Used | ||
| C2 | 2 | WHT | EVAP Canister Vent Valve Control | ||
| C2 | 3 | DK GRN/WHT | Fuel Pump Relay Control | ||
| C2 | 4 | LT BLU | EGR Valve Control | ||
| C2 | 5 | BRN/WHT | Malfunction Indicator Light Control | ||
| C2 | 6 & 7 | ..... | Not Used | ||
| C2 | 8 | WHT | Engine Speed Output | ||
| C2 | 9 | TAN/BLK | Delivered Torque Output | ||
| C2 | 10 | PPL | Heated Oxygen Sensor No. 1 Signal (Bank No. 2) | ||
| C2 | 11 | DK BLU | Heated Oxygen Sensor No. 3 Signal (Bank No. 1) | ||
| C2 | 12 | PPL/WHT | Heated Oxygen Sensor No. 1 Signal (Bank No. 1) | ||
| C2 | 13-15 | ..... | Not Used | ||
| C2 | 16 | ORG/BLK | Park Neutral Position Switch Signal | ||
| C2 | 17 | RED | Transmission Range "C" Input (4L60E Only) | ||
| C2 | 18 | GRY | Cruise Control/Clutch Anticipate Switch | ||
| C2 | 19 & 20 | ..... | Not Used | ||
| C2 | 21 | BRN/WHT | 2nd Gear Start Signal | ||
| C2 | 22 | DK GRN/WHT | A/C Request Signal | ||
| C2 | 23 | PPL/WHT | Crank Signal | ||
| C2 | 24 | BRN | Cruise Control Release Signal | ||
| C2 | 25 | LT GRN | Manifold Absolute Pressure Sensor Signal | ||
| C2 | 26 | YEL | Engine Coolant Temperature Sensor Signal | ||
| C2 | 27 | RED/BLK | A/C Refrigerant Pressure Sensor Signal | ||
| C2 | 28 | BRN | EGR Pintle Position Signal | ||
| C2 | 29-32 | ..... | Not Used | ||
| C2 | 33 | GRY | 5-Volt Reference "A" | ||
| C2 | 34 | LT BLU/BLK | 5-Volt Reference "B" | ||
| C2 | 35 | GRY | A/C Refrigerant Pressure Sensor Ground | ||
| C2 | 36-38 | ..... | Not Used | ||
| C2 | 39 | DK GRN/WHT | A/C Compressor Clutch Relay Control | ||
| C2 | 40 & 41 | ..... | Not Used | ||
| C2 | 42 | PNK/BLK | Fuel Injector No. 3 Control | ||
| C2 | 43 & 44 | ..... | Not Used | ||
| C2 | 45 | RED/BLK | Pressure Control Solenoid High (4L60E Only) | ||
| C2 | 46 | LT BLU/WHT | Pressure Control Solenoid Low (4L60E Only) | ||
| C2 | 47 | ..... | Not Used | ||
| C2 | 48 | WHT | 3-2 Shift Solenoid Control (4L60E Only) | ||
| C2 | 49 | ..... | Not Used | ||
| C2 | 50 | TAN | Intake Air Temperature Sensor Signal | ||
| C2 | 51-54 | ..... | Not Used | ||
| C2 | 55 | DK GRN | Fuel Tank Pressure Sensor Signal | ||
| C2 | 56 | ..... | Not Used | ||
| C2 | 57 | DK BLU | Transmission Range "B" Input (4L60E Only) | ||
| C2 | 58 | BRN | Engine Oil Level Sensor Signal | ||
| C2 | 59 & 60 | ..... | Not Used | ||
| C2 | 61 | RED | Generator Control | ||
| C2 | 62-67 | ..... | Not Used | ||
| C2 | 68 | YEL/BLK | Transaxle Fluid Temperature Sensor (4L60E Only) | ||
| C2 | 69 | PPL | Fuel Level Signal | ||
| C2 | 70-75 | ..... | Not Used | ||
| C2 | 76 | DK GRN | Starter Enable (If Equipped) | ||
| C2 | 77 | ..... | Not Used | ||
| C2 | 78 | BRN | TCC PWM Solenoid Control (4L60E Only) | ||
| C2 | 79 | TAN/BLK | TCC Enable Solenoid Control (4L60E Only) | ||
| C2 | 80 | ..... | 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.