GM Service Manual Online
For 1990-2009 cars only
Table 1: Back View Of the PCM Connector C1 (Manual and 3-Speed A/T Only)
Table 2: Back View Of the PCM Connector C2 (Manual and 3-Speed A/T Only)
Table 3: Back View Of the PCM Connector C3 (Manual and 3-Speed A/T Only)
Table 4: Back View Of the PCM Connector C1 (4-Speed A/T Only)
Table 5: Back View Of the PCM Connector C2 (4-Speed A/T Only)
Table 6: Back View Of the PCM Connector C3 (4-Speed A/T Only)
Table 7: Back View Of the PCM Connector C4 (4-Speed A/T Only)

Back View Of the PCM Connector C1 (Manual and 3-Speed A/T Only)


Object Number: 60597  Size: CF

Connector Part Information

    • Manual and 3-Speed A/T ONLY
    • PCM Connector C1

Pin

Wire Color

Circuit No.

Function

C1-1

WHT

--

Battery Positive Voltage

C1-2

BLK/YEL

--

Starter Signal

C1-3

PPL

--

Duty Check Output

C1-4

ORN

--

Ignition Control Module Output

C1-5

PNK

--

Fuel Pump Relay Control

C1-6

BLU/RED

--

Test Switch Signal

C1-7

YEL

--

VSS Input

C1-8

--

--

Blank

C1-9

YEL/BLK

--

A/C ON Signal

C1-10

BLU

--

Main Relay Control

C1-11

--

--

Blank

C1-12

BLU/BLK

--

Ignition Positive Voltage

C1-13

BLU/BLK

--

Ignition Positive Voltage

C1-14

PPL/YEL

--

MIL Control

C1-15

LT GRN/WHT

--

EGR Solenoid Vacuum Control

C1-16

WHT/YEL

--

TCC Relay Control (M/T and 3-Speed

C1-17

BLU/YEL

--

Diagnostic Request Signal

C1-18

GRN/RED

--

EGR Bypass Valve Control

C1-19

BLU/ORN

--

Power Steering Pressure Signal

C1-20

PNK/WHT

--

ABS Idle-Up Signal

C1-21

--

--

Blank

C1-22

BLK/RED

--

Crank Signal (3-Speed A/T Only)

Back View Of the PCM Connector C2 (Manual and 3-Speed A/T Only)


Object Number: 60590  Size: CF

Connector Part Information

    • Manual and 3-Speed A/T ONLY
    • PCM Coonector C2

Pin

Wire Color

Circuit No.

Function

C2-1

BRN/RED

--

Fuel Tank Pressure Sensor Input

C2-2

WHT

--

HO2S 1 Signal

C2-3

YEL/RED

--

Fuel Level Input

C2-4

RED/YEL

--

ECT Sensor Input

C2-5

GRY/RED

--

Referance Voltage

C2-6

RED/BLK

--

IAT Sensor Input

C2-7

--

--

Blank

C2-8

--

--

Blank

C2-9

GRY/BLK

--

MAF Sensor Signal

C2-10

YEL

--

HO2S 2 Signal

C2-11

GRY

--

TP Sensor Input

C2-12

--

--

Blank

C2-13

BRN/YEL

--

MAP Sensor Input

C2-14

BLU/WHT

--

CTP Switch Signal

C2-15

--

--

Blank

C2-16

--

--

Blank

Back View Of the PCM Connector C3 (Manual and 3-Speed A/T Only)


Object Number: 60602  Size: CF

Connector Part Information

    • Manual and 3-Speed A/T ONLY
    • PCM Connector C3

Pin

Wire Color

Circuit No.

Function

C3-1

BLK/ORN

--

Ground

C3-2

BLK/ORN

--

Ground

C3-3

WHT

--

CMP Sensor

C3-4

--

--

Blank

C3-5

--

--

Blank

C3-6

GRN/WHT

--

EVAP Canister Vent Valve Control

C3-7

GRN/BLU

--

EVAP Tank Pressure Control Solenoid Vacuum Valve Control

C3-8

--

--

Blank

C3-9

PNK/WHT

--

HO2S 2 Heater Control

C3-10

--

--

Blank

C3-11

RED

--

Fuel Injector #1 Control

C3-12

LT GRN/BLK

--

IAC Valve Control

C3-13

WHT/GRN

--

Fuel Injector #3 Control

C3-14

BLK/GRN

--

PCM Ground

C3-15

BRN

--

Sensor Ground

C3-16

BLK

--

Ignition Reference High (CKP Sensor)

C3-17

WHT

--

Ignition Reference Low (CKP Sensor)

C3-18

--

--

Blank

C3-19

--

--

Blank

C3-20

--

--

Blank

C3-21

GRN/WHT

--

Brake Light Switch (A/T Only)

C3-22

PPL/GRN

--

Serial Data Output

C3-23

PNK

--

HO2S Sensor 1 Heater Control

C3-24

LT GRN/RED

--

Fuel Injector #2 Control

C3-25

LT GRN/YEL

--

EVAP Canister Purge Valve Control

C3-26

WHT/BLK

--

Fuel Injector #4 Control

Back View Of the PCM Connector C1 (4-Speed A/T Only)


Object Number: 60597  Size: CF

Connector Part Information

    • 4-Speed A/T ONLY
    • PCM Connector C1

Pin

Wire Color

Circuit No.

Function

C1-1

--

--

Blank

C1-2

BLK/YEL

--

Starter Signal

C1-3

WHT

--

CMP Sensor Input

C1-4

YEL

--

VSS Input

C1-5

YEL/BLK

--

A/C ON Signal

C1-6

BLU/YEL

--

Diagnostic Requeat Signal

C1-7

--

--

Blank

C1-8

WHT

--

HO2S 1 Signal

C1-9

GRY/BLK

--

MAF Signal

C1-10

GRY/RED

--

Reference Voltage

C1-11

BRN

--

Sensor Ground

C1-12

--

--

Blank

C1-13

GRN/WHT

--

Brake Signal

C1-14

PNK/GRN

--

O/D Cut Signal

C1-15

BLU/WHT

--

CTP Switch Signal

C1-16

BLU/ORN

--

Power Steering Pressure Signal

C1-17

PNK/WHT

--

ABS Idle-Up Signal

C1-18

BLU/RED

--

Test Switch Signal

C1-19

RED/BLK

--

IAT Input

C1-20

GRY

--

Throttle Position Input

C1-21

RED/YEL

--

ECT Input

C1-22

--

--

Blank

Back View Of the PCM Connector C2 (4-Speed A/T Only)


Object Number: 66410  Size: CF

Connector Part Information

    • 4-Speed A/T ONLY
    • PCM Connector C2

Pin

Wire Color

Circuit No.

Function

C2-1

YEL

--

HO2S 2 Signal

C2-2

BRN/YEL

--

MAP Input

C2-3

YEL/RED

--

Fuel Level Input

C2-4

YEL/RED

--

Fuel Gauge Ground

C2-5

GRN/WHT

--

EVAP Canister Vent Valve Control

C2-6

PNK/WHT

--

HO2S 2 Heater Control

C2-7

BRN/RED

--

Fuel Tank Pressure Input

C2-8

BLK

--

Ignition Reference High

C2-9

WHT

--

Ignition Reference Low

C2-10

--

--

Blank

C2-11

GRN/RED

--

EGR Bypass Valve Control

C2-12

GRN/BLU

--

EVAP Tank Pressure Control Solenoid Vacuum Valve Control

Back View Of the PCM Connector C3 (4-Speed A/T Only)


Object Number: 60590  Size: CF

Connector Part Information

    • 4-Speed A/T ONLY
    • PCM Connector C3

Pin

Wire Color

Circuit No.

Function

C3-1

WHT

--

VSS Signal High

C3-2

ORN/GRN

--

Overdrive Switch Signal

C3-3

ORN/WHT

--

4WD Low Signal

C3-4

ORN

--

Shift Mode Signal

C3-5

RED/YEL

--

Lights ON Signal

C3-6

WHT/BLK

--

O/D OFF Indicator

C3-7

PNK

--

Power Indicator

C3-8

GRN/RED

--

Shift Solenoid No. 2 Control

C3-9

BLK

--

VSS Signal Low

C3-10

GRN/BLU

--

L Position Signal

C3-11

GRN/RED

--

2 Position Signal

C3-12

GRN

--

D Position Signal

C3-13

ORN/BLU

--

N Position Signal

C3-14

RED

--

R Position Signal

C3-15

GRN/ORN

--

Shift Solenoid No. 1 Control

C3-16

GRN/YEL

--

TCC Solenoid Control

Back View Of the PCM Connector C4 (4-Speed A/T Only)


Object Number: 60602  Size: CF

Connector Part Information

    • 4-Speed A/T ONLY
    • PCM Connector C4

Pin

Wire Color

Circuit No.

Function

C4-1

BLU

--

Main Relay Control

C4-2

BLK/ORN

--

Ground

C4-3

BLU/BLK

--

Ignition Positive Voltage

C4-4

WHT

--

Battery Positive Voltage

C4-5

PPL

--

Duty Check Output

C4-6

ORN

--

Ignition Control Module Output

C4-7

GRN/WHT

--

EGR Solenoid Vacuum Valve Control

C4-8

--

--

Blank

C4-9

PNK

--

Fuel Pump Control

C4-10

PNK/BLU

--

Throttle Position Put(4 Speed A/T Only)

C4-11

RED

--

Fuel Injector #1 Control

C4-12

LT GRN/BLK

--

IAC Valve Control

C4-13

WHT/GRN

--

Fuel Injector #3 Control

C4-14

BLK/ORN

--

Ground

C4-15

BLK/GRN

--

Ground

C4-16

BLU/BLK

--

Ignition Positive Voltage

C4-17

PPL/GRN

--

Serial Data Output

C4-18

--

--

Blank

C4-19

PNK

--

HO2S 1 Heater Control

C4-20

--

--

Blank

C4-21

--

--

Blank

C4-22

--

--

Blank

C4-23

PPL/YEL

--

MIL Control

C4-24

LT GRN/RED

--

Fuel Injector #2 Control

C4-25

GRN/YEL

--

EVAP Canister Purge Valve Control

C4-26

WHT/BLK

--

Fuel Injector #4 Control