GM Service Manual Online
For 1990-2009 cars only

Powertrain Control Module Connector End Views FWD

Table 1: Back View of PCM Connector C1
Table 2: Back View of PCM Connector C2
Table 3: Back View of PCM Connector C3
Table 4: Back View of PCM Connector C4

Back View of PCM Connector C1


Object Number: 789637  Size: CF

Connector Part Information

    • 34-Pin
    • WH

Pin

Wire Color

Function

1

YE

Fuel Injector 1 Control

2

BK

Fuel Injector 2 Control

3

WH

Fuel Injector 3 Control

4

BU

Fuel Injector 4 Control

5

BN

Ground

6

WH/BK

Ground

7

WH/BK

Ground

8

RD/BU

Ignition Trigger Signal Coil 1

9

YE/GN

Ignition Trigger Signal Coil 2

10

GY

Ignition Trigger Signal Coil 3

11

WH

Ignition Trigger Signal Coil 4

12

BK/YE

Camshaft Position (CMP) Actuator Solenoid Valve Low Control

13

YE

Camshaft Position (CMP) Actuator Solenoid Valve High Control

14

L-GN/BK

Fan 2 Relay Control

15

--

Not Used

16

RD

Ignition Positive Voltage*

17

BK

Crank Signal*

18

YE

5-Volt Reference Circuit

19

WH

Engine Coolant Temperature (ECT) Sensor Input

20

YE/BK

Intake Air Temperature (IAT) Sensor Input

21

L-GN

Throttle Position (TP) Sensor 1 Input

22-23

--

Not Used

24

BU/YE

Ignition Fail Safe Input

25-26

--

Not Used

27

RD

EVAP Canister Vent Solenoid Valve Control

28

BN

Sensor Ground

29

BU/WH

Mass Air Flow (MAF) Sensor Signal Low

30

GN

Mass Air Flow (MAF) Sensor Signal High

31

L-GN

Throttle Position (TP) Sensor 2 Input

32-33

--

Not Used

34

BU/BK

EVAP Canister Purge Solenoid Valve Control

*Automatic Transmission Only

Back View of PCM Connector C2


Object Number: 789639  Size: CF

Connector Part Information

    • 35-Pin
    • WH

Pin

Wire Color

Function

1

BK

Knock Sensor (KS) Signal High

2

WH/BK

Ground

3

WH

TAC Motor Control Low

4

L-GN

TAC Motor Control High

5

PK

Heated Oxygen Sensor (HO2S) 1 Heater Circuit Control

6

WH/BK

Ground

7

WH/BK

Heated Oxygen Sensor (HO2S) Shield Ground

8

BU/RD

Power Steering Pressure (PSP) Switch Input

9

BU

Shift Solenoid (SS) 2 Control*

10

BU/WH

Torque Converter Clutch (TCC) Control*

11

RD/YE

Shift Solenoid (SS) 1 Control*

12

PK

or

BK

Line Pressure Control (PC) Solenoid Control Low w/AT

or

Crank Signal w/MT

13

RD/WH

Line Pressure Control (PC) Solenoid Control High*

14-15

--

Not Used

16

L-GN

Fan 1 Relay Control

17

GY

TAC Shield Ground

18-20

--

Not Used

21

PK/BK

Heated Oxygen Sensor (HO2S) 2 Heater Circuit Control

22

--

Not Used

23

BK

Heated Oxygen Sensor (HO2S) 1 Input

24

BK

Camshaft Position (CMP) Sensor Input

25

BK

Crankshaft Position (CKP) Sensor Input

26-27

--

Not Used

28

WH

Knock Sensor (KS) Signal Low

29

WH

Heated Oxygen Sensor (HO2S) 2 Input

30

--

Not Used

31

WH

Heated Oxygen Sensor (HO2S) 1 Low Reference

32

--

Not Used

33

WH

CMP Sensor and CKP Sensor Ground

34

--

Not Used

35

WH/BK

Ground

*Automatic Transmission Only

Back View of PCM Connector C3


Object Number: 789640  Size: CF

Connector Part Information

    • 35-Pin
    • WH

Pin

Wire Color

Function

1

YE

AC Pressure Switch

2

YE/BK

AC Compressor Clutch Relay Control

3 - 5

--

Not Used

6

BK/RD

Throttle Actuator Control (TAC) System Ignition Voltage

7

L-GN

Overdrive (OD) Indicator Control*

8

L-GN/BK

Park Neutral Position (PNP) Switch L Position Signal*

9

L-GN

Park Neutral Position (PNP) Switch 2 Position Signal*

10

BU

Park Neutral Position (PNP) Switch D Position Signal*

11

RD/BK

Park Neutral Position (PNP) Switch R Position Signal*

12

GN/OG

Cruise Control Interrupt Circuit

13

GN/RD

Cruise Control Indicator Lamp

14

YE/RD

Engine Coolant Temperature Gage Output

15-16

--

Not Used

17

PU/WH

Vehicle Speed Sensor (VSS) Input

18

--

Not Used

19

GN/WH

Cruise Brake Switch Signal

20-23

--

Not Used

24

GN/YE

Cruise Control Switch

25-27

--

Not Used

28

YE

AC Request Signal

29

GN/BK

Overdrive (OD) Switch Signal*

30-31

--

Not Used

32

BK/BU

Evaporator Temperature Sensor Input

33

GN/WH

AC On Signal

34-35

--

Not Used

*Automatic Transmission Only

Back View of PCM Connector C4


Object Number: 789641  Size: CF

Connector Part Information

    • 31-Pin
    • WH

Pin

Wire Color

Function

1

BK

Ignition Positive Voltage

2

--

Not Used

3

RD/WH

Battery Voltage

4

GY

EVAP Vacuum Leak Pump Control

5

BK

Engine Speed Output for Tachometer

6-7

--

Not Used

8

BK/WH

EFI Relay High Control

9

BK/OG

Ignition Positive Voltage

10

GN/RD

Circuit Opening Relay Control

11

RD/YE

MIL Control

12

GN

Electrical Load Idle-Up Signal, Tail Lamps

13

WH

Electrical Load Idle-Up Signal, Rear Defogger

14

YE

Supplemental Inflatable Restraint (SIR) System Signal

15-16

--

Not Used

17

RD/YE

Engine Speed Output to Brake Pressure Modulator Valve (BPMV), with Traction Control Only

18

BU/RD

Serial Data

19

PK

Brake Pressure Modulator Valve (BPMV) Serial Data

20

PK/BK

Diagnostic Request Circuit

21

BU

Fuel Tank Pressure (FTP) Sensor Input

22

GN

Accelerator Pedal Position (APP) Sensor 1 Signal

23

WH

Accelerator Pedal Position (APP) Sensor 2 Signal

24

BK/WH

EFI Signal High, with Traction Control Only

25

RD/WH

Traction Control High, with Traction Control Only

26

BK

Accelerator Pedal Position (APP) Sensor 1 Reference Voltage

27

BK

Accelerator Pedal Position (APP) Sensor 2 Reference Voltage

28

YE

Accelerator Pedal Position (APP) Sensor 1 Low Reference

29

YE

Accelerator Pedal Position (APP) Sensor 2 Low Reference

30

BU

EFI Signal Low, with Traction Control Only

31

WH

Traction Control Low, with Traction Control Only

*Automatic Transmission Only

Powertrain Control Module Connector End Views AWD

Table 1: Back View of PCM Connector C1
Table 2: Back View of PCM Connector C2
Table 3: Back View of PCM Connector C3
Table 4: Back View of PCM Connector C4

Back View of PCM Connector C1


Object Number: 789637  Size: CF

Connector Part Information

    • 34-Pin
    • WH

Pin

Wire Color

Function

1

YE

Fuel Injector 1 Control

2

BK

Fuel Injector 2 Control

3

WH

Fuel Injector 3 Control

4

BU

Fuel Injector 4 Control

5

BN

Ground

6

WH/BK

Ground

7

WH/BK

Ground

8

RD/BU

Ignition Trigger Signal Coil 1

9

YE/GN

Ignition Trigger Signal Coil 2

10

GY

Ignition Trigger Signal Coil 3

11

WH

Ignition Trigger Signal Coil 4

12

BK

Crank Signal

13

BK/YE

Camshaft Position (CMP) Actuator Solenoid Valve Low Control

14

YE

Camshaft Position (CMP) Actuator Solenoid Valve High Control

15

--

Not Used

16

BK/BU

Idle Air Control (IAC) Valve Control

17

--

Not Used

18

YE

5-Volt Reference Circuit

19

WH

Engine Coolant Temperature (ECT) Sensor Input

20

YE/BK

Intake Air Temperature (IAT) Sensor Input

21

L-GN

Throttle Position (TP) Sensor Input

22

--

Not Used

23

RD

Ignition Positive Voltage

24

BU/YE

Ignition Fail Safe Input

25

RD

EVAP Vent Solenoid Valve Control

26

BK

Camshaft Position (CMP) Sensor Input

27

BK

Crankshaft Position (CKP) Sensor Input

28

BN

Sensor Ground

29

WH/BU

Mass Air Flow (MAF) Sensor Signal Low

30

GN

Mass Air Flow (MAF) Sensor Signal High

31-33

--

Not Used

34

WH

CMP Sensor and CKP Sensor Ground

Back View of PCM Connector C2


Object Number: 789639  Size: CF

Connector Part Information

    • 35-Pin
    • WH

Pin

Wire Color

Function

1

BK

Knock Sensor (KS) Signal High

2

WH

Knock Sensor (KS) Signal Low

3-5

--

Not Used

6

PK

Heated Oxygen Sensor (HO2S) 1 Heater Circuit Control

7

WH/BK

Ground

8

GY

EVAP Vacuum Leak Pump Control

9

L-GN/BK

Fan 2 Relay Control

10

BU

Shift Solenoid (SS) 2 Control

11

RD/YE

Shift Solenoid (SS) 1 Control

12

PK

Line Pressure Control (PC) Solenoid Control Low

13

RD/WH

Line Pressure Control (PC) Solenoid Control High

14

--

Not Used

15

BU/WH

Torque Converter Clutch (TCC) Control

16-18

--

Not Used

19

BU/BK

EVAP Canister Purge Solenoid Control

20

BU/OG

Shift Solenoid ST Control

21

L-GN

Fan 1 Relay Control

22

BK

Heated Oxygen Sensor (HO2S) 1 Input

23-25

--

Not Used

26

WH

Input Shaft Speed Sensor Reference High

27

YE

AC Pressure Switch

28

WH/BK

Ground

29

--

Not Used

30

BU/RD

Power Steering Pressure (PSP) Switch Input

31

--

Not Used

32

WH/BU

Transmission Fluid Temperature Sensor Input

33

--

Not Used

34

BK

Input Shaft Speed Sensor Reference Low

35

--

Not Used

Back View of PCM Connector C3


Object Number: 789640  Size: CF

Connector Part Information

    • 35-Pin
    • WH

Pin

Wire Color

Function

1

--

Not Used

2

GN/BK

Overdrive (OD) Switch Signal

3

BK

Engine Speed Output for Tachometer

4

BK/WH

EFI Relay High Control

5

YE/BK

AC Compressor Clutch Relay Control

6

--

Not Used

7

L-GN

Overdrive (OD) Indicator Control

8

L-GN/BK

Park Neutral Position (PNP) Switch L Position Signal

9

L GN

Park Neutral Position (PNP) Switch 2 Position Signal

10

BU

Park Neutral Position (PNP) Switch D Position Signal

11

RD/BK

Park Neutral Position (PNP) Switch R Position Signal

12

--

Not Used

13

BU/WH

Cruise Control Idle

14

YE/RD

Engine Coolant Temperature Gage Output

15

BU/RD

Serial Data Line

16

GN/RD

Circuit Opening Relay Control

17

PU/WH

Vehicle Speed Sensor (VSS) Input

18

RD/YE

Overdrive (OD) Cut Signal, with Cruise Control

19

GN/WH

Brake Switch Signal

20

YE

AC Request Signal

21-22

--

Not Used

23

WH

Heated Oxygen Sensor (HO2S) 2 Input

24-31

--

Not Used

32

BK/BU

Evaporator Temperature Sensor Input

33

GN/WH

AC On Signal

34-35

--

Not Used

Back View of PCM Connector C4


Object Number: 789641  Size: CF

Connector Part Information

    • 31-Pin
    • WH

Pin

Wire Color

Function

1

BK

Ignition Positive Voltage

2

--

Not Used

3

RD/WH

Battery Voltage

4-6

--

Not Used

7

PK/BK

Heated Oxygen Sensor (HO2S) 2 Heater Circuit Control

8

--

Not Used

9

BK/OG

Ignition Positive Voltage

10

RD/YE

Engine Speed Output

11

RD/YE

MIL Control

12

GN

Electrical Load Idle-Up Signal, Tail Lamps

13

WH

Electrical Load Idle-Up Signal, Rear Defogger

14

YE

Supplemental Inflatable Restraint (SIR) System Signal

15-18

--

Not Used

19

PK

BPMV Serial Data

20

PK/BK

Diagnostic Request Circuit

21

BU

Fuel Tank Pressure (FTP) Sensor Input

22-31

--

Not Used