Powertrain Control Module Connector Terminal Identification

Fig 1: Identifying Powertrain Control Module (PCM) Harness Connector Terminals (Except 1.8L - With 4-Speed A/T)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Identifying Powertrain Control Module (PCM) Connector Terminals (1.8L - With 4-Speed A/T)

Courtesy 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.