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Powertrain Control Module Connector Terminal Identification

Fig 1: Identifying Powertrain Control Module (PCM) Harness Connector Terminals (Except 1.8L - With 4-Speed A/T)
G99C03052Courtesy of GENERAL MOTORS CORP.
Fig 2: Identifying Powertrain Control Module (PCM) Connector Terminals (1.8L - With 4-Speed A/T)
G00021010Courtesy of GENERAL MOTORS CORP.
POWERTRAIN CONTROL MODULE CONNECTOR TERMINAL IDENTIFICATION (1.0L)

Connector/Terminal No. (1) Wire Color Function
C1/1 BLK/GRN PCM Ground
C1/2 WHT/BLU Ignition Positive Voltage
C1/3 RED/WHT EVAP Canister Vent Solenoid Control
C1/4 PNK HO2S 2 Heater Control
C1/5 RED/BLK EGR By-Pass Valve Control
C1/6 GRN EGR Solenoid Vacuum Valve Control
C1/7 RED/GRN EVAP Canister Purge Valve Control
C1/8 & 9 ..... Not Used
C1/10 ORG Ignition Trigger Signal
C1/11 GRY/YEL Idle Speed Control (ISC) Motor Control
C1/12 YEL/BLK Fuel Injector Control
C1/13 BLK/BLU PCM Ground
C1/14 WHT Memory Power Input
C1/15 WHT/BLU Ignition Positive Voltage
C1/16 GRY/BLK Idle Speed Control (ISC) Motor Relay Control
C1/17 PPL/YEL MIL Control
C1/18 PPL/RED Upshift Indicator Light Control
C1/19 RED/BLU EVAP Tank Pressure Control Solenoid Control Vacuum Valve Control
C1/20 BLU Engine Cooling Fan Relay Control
C1/21 PNK/WHT Fuel Pump Relay Control
C1/22 BLU/BLK Main Relay Control
C1/23 ..... Not Used
C1/24 GRY/RED Idle Speed Control (ISC) Motor Control
C1/25 YEL/RED Early Fuel Evaporation (EFE) Heater Relay Control
C1/26 BLK/RED PCM Ground
C2/1 LT GRN Reference Voltage
C2/2 ORG Ignition Reference High (CMP Sensor)
C2/3 WHT/BLK Ignition Reference High (CKP Sensor)
C2/4 GRY/GRN Closed Throttle Position (CTP) Switch Signal
C2/5 LT GRN/RED MAP Sensor Input
C2/6 LT GRN/WHT TP Sensor Input
C2/7 GRY/WHT ECT Sensor Input
C2/8 PNK/BLK HO2S 1 Heater Control
C2/9 LT GRN/BLK Sensor Ground
C2/10 WHT Ignition Reference Low (CMP Sensor)
C2/11 WHT/RED Ignition Reference Low (CKP Sensor)
C2/12 WHT/BLK Early Fuel Evaporation (EFE) ON Signal
C2/13 RED HO2S 1 Signal
C2/14 GRY IAT Sensor Input
C2/15 ..... Not Used
C2/16 BLK/YEL Clutch Pedal Position (CPP) Switch Input
C3/1-5 ..... Not Used
C3/6 BLU/YEL Diagnostic Request Signal
C3/7 PPL/GRN Test Switch Signal
C3/8 YEL HO2S 2 Signal
C3/9 BLK/BLU Fuel Gauge Ground
C3/10 YEL/RED Fuel Level Sensor Input
C3/11 YEL/GRN VSS Input
C3/12 PPL/WHT Serial Data Output
C3/13-16 ..... Not Used
C3/17 LT GRN/RED A/C Cut-Out Control
C3/18 BRN/YEL Electrical Load Idle-Up Signal
C3/19 BLU/RED A/C Idle-Up Signal
C3/20 BLK/WHT Ignition Positive Signal
C3/21 LT GRN/YEL Fuel Tank Pressure Sensor Input
C3/22 ..... Not Used
(1) See Fig 1.
POWERTRAIN CONTROL MODULE CONNECTOR TERMINAL IDENTIFICATION (1.3L)

Connector/Terminal No. (1) Wire Color Function
C1/1 BLK/GRN PCM Ground
C1/2 WHT/BLU Ignition Positive Voltage
C1/3 PNK/BLU EVAP Canister Vent Solenoid Control
C1/4 PNK HO2S 2 Heater Control
C1/5 ORG/GRN Shift Solenoid B (A/T)
C1/6 ORG Shift Solenoid A (A/T)
C1/7 RED/GRN EVAP Canister Purge Valve Control
C1/8 & 9 ..... Not Used
C1/10 GRY/RED Ignition Trigger Signal 1-4 Coil
C1/11 BRN/BLK Fuel Injector No. 3 Control
C1/12 BRN/WHT Fuel Injector No. 1 Control
C1/13 BLK/BLU PCM Ground
C1/14 WHT Memory Power Input
C1/15 WHT/BLU Ignition Positive Voltage
C1/16 LT GRN/RED EVAP Tank Pressure Control Solenoid Vacuum Valve Control
C1/17 PPL/YEL MIL Control
C1/18 PNK/WHT Fuel Pump Relay Control
C1/19 BLU/BLK Main Relay Control
C1/20 BLU Engine Cooling Fan Relay Control
C1/21 & 22 ..... Not Used
C1/23 GRY/BLU Ignition Trigger Signal 2-3 Coil
C1/24 BRN/YEL Fuel Injector No. 4 Control
C1/25 BRN/RED Fuel Injector No. 2 Control
C1/26 BLK/RED PCM Ground
C2/1 LT GRN Reference Voltage
C2/2 ORG Ignition Reference High (CMP Sensor)
C2/3 WHT/BLK Ignition Reference High (CKP Sensor)
C2/4 PPL (2) VSS High
C2/5 ORG/GRN MAP Sensor Input
C2/6 LT GRN/WHT TP Sensor Input
C2/7 PNK/BLK HO2S 1 Heater Control
C2/8 ..... Not Used
C2/9 LT GRN/BLK Sensor Ground
C2/10 GRY/WHT ECT Sensor Input
C2/11 WHT/RED Ignition Reference Low (CKP Sensor)
C2/12 GRY/YEL VSS Low (A/T)
C2/13 RED HO2S 1 Signal
C2/14 GRY IAT Sensor Input
C2/15 BLU/WHT Power Steering Pressure Switch Input
C2/16 BLK/YEL Transmission Range (TR) Switch Input (A/T);
Closed Pedal Position (CPP) Switch Input (M/T)
C3/1 ..... Not Used
C3/2 RED/YEL Idle Air Control (IAC) Valve
C3/3 GRN "2" Position Signal (A/T)
C3/4 ORG/YEL "N" Position Signal (A/T)
C3/5 ORG/BLK "P" Position Signal (A/T)
C3/6 BRN Tachometer (If Equipped)
C3/7 PPL/GRN Test Switch Signal
C3/8 BLU/YEL Diagnostic Request Signal
C3/9 BLK/BLU Ground (With Tachometer)
C3/10 YEL HO2S 2 Signal
C3/11 YEL/RED Fuel Level Sensor Input
C3/12 PPL/WHT Serial Data Output
C3/13 PPL/RED Duty Output Terminal
C3/14 GRN/BLU "L" Position Signal (A/T)
C3/15 GRN/RED "D" Position Signal (A/T)
C3/16 RED "R" Position Signal (A/T)
C3/17 GRY A/C Cut-Out Control
C3/18 BRN/WHT Electrical Load Idle-Up Signal
C3/19 BLU/RED A/C Idle-Up Signal
C3/20 BLK/WHT Ignition Positive Voltage
C3/21 LT GRN/YEL Fuel Tank Pressure Sensor Input
C3/22 LT GRN/BLK Sensor Ground
(1) See Fig 1.
(2) Yellow/Green wire on M/T.
POWERTRAIN CONTROL MODULE CONNECTOR TERMINAL IDENTIFICATION (1.8L - WITH 4-SPEED A/T)

Connector/Terminal No. (1) Wire Color Function
C1/1 YEL Fuel Injector 1 Control
C1/2 BLK/RED Fuel Injector 2 Control
C1/3 WHT Fuel Injector 3 Control
C1/4 BLK Fuel Injector 4 Control
C1/5-7 ..... Not Used
C1/8 PPL Shift Solenoid 1 Control
C1/9 ..... Not Used
C1/10 RED/BLU Ignition Trigger Signal 1
C1/11 YEL/GRN Ignition Trigger Signal 2
C1/12 GRY Ignition Trigger Signal 3
C1/13 WHT Ignition Trigger Signal 4
C1/14-16 ..... Not Used
C1/17 BLU/BLK EVAP Canister Vent Solenoid Valve Control
C1/18 BLK/BLU (IAC) Valve Control
C1/19 BLU/YEL TCC Solenoid Control
C1/20 BRN/YEL Shift Solenoid 2 Control
C1/21 BRN Ground
C1/22 RED EVAP Pressure Switching Solenoid Control
C1/23 RED CMP Actuator Solenoid Valve Control Low
C1/24 BLK CMP Actuator Solenoid Valve Control High
C1/25 BLU/YEL Ignition Fail Safe Input
C1/26 ..... Not Used
C1/27 BLK Knock Sensor Input
C1/28 LT GRN A/C Condenser Fan Control
C1/29 & 30 ..... Not Used
C1/31 BRN Ground
C2/1 BLU/WHT MAF Sensor Signal Low
C2/2 YEL TP Sensor Ground
C2/3 PNK HO2S 1 Heater Circuit Control
C2/4 BLU/BLK EVAP Canister Purge Solenoid Valve Control
C2/5 ..... Not Used
C2/6 PNK HO2S 2 Heater Circuit Control
C2/7 BLU/BLK A/C Cooling Fan Relay Control
C2/8 BRN Ground
C2/9 BLU Fuel Tank Pressure Sensor Input
C2/10 ..... Not Used
C2/11 GRN MAF Sensor Signal High
C2/12 WHT HO2S 1 Input
C2/13 ..... Not Used
C2/14 WHT ECT Sensor Signal
C2/15 BLK CMP Sensor Input
C2/16 BLK CKP Sensor Input
C2/17 BRN Ground
C2/18 BRN Sensor Ground
C2/19 ..... Not Used
C2/20 RED HO2S 2 Input
C2/21 ..... Not Used
C2/22 YEL/BLK IAT Sensor Input
C2/23 LT GRN TP Sensor Input
C2/24 WHT CMP Sensor & CKP Sensor Ground
C3/1 RED/WHT OD Cut Signal
C3/2 RED/BLK PNP Switch Position "R" Signal
C3/3 LT GRN/RED PNP Switch Position "2" Signal
C3/4 LT GRN OD Switch ON & OFF Signal
C3/5 BLU/WHT DLC Diagnostic Request
C3/6 GRN/WHT Brake Switch Signal
C3/7 ..... Not Used
C3/8 YEL/BLU Fuel Pump Cut-Off Signal
C3/9 ..... Not Used
C3/10 BLK Electrical Load Idle Up Signal
C3/11 BLK/WHT Crank Signal
C3/12 LT GRN/BLK PNP Switch Low Signal
C3/13 BLK/WHT Ignition Positive Voltage
C3/14 BLU/RED PSP Switch Signal
C3/15-18 ..... Not Used
C3/19 LT GRN/BLU OD Indicator Control
C3/20 GRN Electrical Load Idle Up Signal
C3/21 ..... Not Used
C3/22 PPL/WHT VSS Input
C3/23-26 ..... Not Used
C3/27 BLK Speed Sensor Signal
C3/28 ..... Not Used
C4/1 RED/WHT Battery Positive Voltage
C4/2 ..... Not Used
C4/3 GRN/RED Circuit Opening Relay Control
C4/4-9 ..... Not Used
C4/10 BLU/WHT Idle Signal To Cruise Control
C4/11 WHT DLC Serial Data Line
C4/12 RED/BLU A/C Cut-Off Control
C4/13 & 14 ..... Not Used
C4/15 RED/YEL MIL Control
C4/16 BLK Ignition Positive Voltage
C4/17 ..... Not Used
C4/18 YEL/RED A/C ON Signal
C4/19-22 ..... Not Used
(1) See Fig 2.
POWERTRAIN CONTROL MODULE CONNECTOR TERMINAL IDENTIFICATION (1.8L - WITHOUT 4-SPEED A/T)

Connector/Terminal No. (1) Wire Color Function
C1/1 RED Camshaft Position (CMP) Actuator Solenoid Valve Control Low
C1/2 BLK Camshaft Position (CMP) Actuator Solenoid Valve Control High
C1/3 BLU/YEL Ignition Fail Safe Input
C1/4 RED EVAP Pressure Switching Solenoid Control
C1/5 BLU/BLK EVAP Canister Vent Solenoid Valve Control
C1/6 ..... Not Used
C1/7 BLU/BLK EVAP Canister Purge Solenoid Valve Control
C1/8 BLU/RED Power Steering Pressure (PSP) Switch
C1/9 LT GRN A/C Condenser Fan Control
C1/10 ..... Not Used
C1/11 BLK/RED Fuel Injector No. 2 Control
C1/12 YEL Fuel Injector No. 1 Control
C1/13 BRN Ground
C1/14 BRN Ground
C1/15 BLK/BLU Idle Air Control (IAC) valve Control Circuit
C1/16 YEL/BLU Fuel Pump Cut-Off Signal (SIR SDM)
C1/17 BLU Fuel Tank Pressure Sensor Input
C1/18 BLK Knock Sensor (KS) Input
C1/19 ..... Not Used
C1/20 RED/BLU Ignition Trigger Signal Coil 1
C1/21 YEL/GRN Ignition Trigger Signal Coil 2
C1/22 GRY Ignition Trigger Signal Coil 3
C1/23 WHT Ignition Trigger Signal Coil 4
C1/24 BLK Fuel Injector No. 4 Control
C1/25 WHT Fuel Injector No. 3 Control
C1/26 BRN Ground
C2/1 YEL Reference Voltage
C2/2 GRN MAF Input
C2/3 YEL/BLK IAT Input
C2/4 WHT ECT Input
C2/5 BLK CKP Sensor Input
C2/6 WHT HO2S 1 Signal Input
C2/7 PNK HO2S 1 Heater Circuit Control
C2/8 BRN Ground
C2/9 BRN Sensor Ground
C2/10 BLU/WHT Mass Air Flow (MAF) Sensor Signal Low
C2/11 LT GRN TP Input
C2/12 BLK Camshaft Position Sensor (CMP) Input
C2/13 WHT CMP Sensor & CKP Sensor GND
C2/14 RED HO2S 2 input
C2/15 PNK HO2S 2 Heater Circuit Control
C2/16 ..... Not Used
C3/1 RED/WHT Battery Positive Voltage
C3/2 BLK Idle Up Signal (Defogger)
C3/3 GRN Idle Signal (Taillights)
C3/4 ..... Not Used
C3/5 RED/YEL MIL Control
C3/6 BLU/WHT Diagnostic Request
C3/7 BLU/WHT Cruise Control Idle
C3/8 ..... Not Used
C3/9 PPL/WHT VSS Input
C3/10 YEL/RED A/C ON Signal
C3/11 BLK/WHT Crank Signal
C3/12 BLK Ignition Positive Voltage
C3/13 BLK Engine Speed Output For Tachometer
C3/14 GRN/RED Circuit Opening Relay Control
C3/15 & 16 ..... Not Used
C3/17 WHT Serial Data Line
C3/18-20 ..... Not Used
C3/21 RED/BLU A/C Cut-Out Control
C3/22 BLU/BLK Cooling Fan Control
(1) See Fig 1.
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