GM Service Manual Online
For 1990-2009 cars only
Table 1: Back View Of the PCM Connector C1
Table 2: Back View Of the PCM Connector C2
Table 3: Back View Of the PCM Connector C4

Back View Of the PCM Connector C1


Object Number: 477054  Size: CF

Connector Part Information

    • 1.6L VIN 6 Powertrain
    • 35 Pin Gray Connector C1 with Blue Terminal Secondary Lock Insert

Pin

Wire Color

Function

C1-1

GRY/RED

Fuel Tank Pressure Sensor Reference Voltage

C1-2

WHT

Battery Positive Voltage

C1-3

PNK/GRN

HO2S 2 Heater Control

C1-4

GRY

TP Signal (for cruise control if equipped)

C1-5

--

Not Used

C1-6

BRN

Tachometer

C1-7

PPL/YEL

MIL Control

C1-8

GRY/WHT

A/C Cut-Out Control

C1-9

BLU

Main Relay Control

C1-10 to C1-12

--

Not Used

C1-13

PPL/GRN

Serial Data Output

C1-14

--

Not Used

15

BLK/ORN

Electrical Load Diode Signal

C1-16

PNK/WHT

HVAC Blower Idle-Up Signal

C1-17

YEL/BLK

A/C Idle-Up Signal

C1-18

--

Not Used

C1-19

ORN/BLK

4WD Indicator Lamp (if equipped)

C1-20 to C1-21

--

Not Used

C1-22

YEL/BLU

A/C Condenser Fan Relay Control

C1-23

WHT/GRN

Fuel Pump Relay Control

C1-24

GRY/YEL

HO2S 2 Sensor Ground

C1-25

--

Not Used

C1-26

RED/GRN

HO2S 2 Signal

C1-27

BRN/RED

Fuel Tank Pressure Sensor Input

C1-28

BLU/WHT

Fuel Tank Level Sensor Input

C1-29

--

Not Used

C1-30

PNK/BLK

ABS Idle-Up Signal (if equipped)

C1-31 to C1-33

--

Not Used

C1-34

GRN/WHT

Brake Switch Signal

C1-35

PNK/BLU

O/D Cut Signal (from cruise control servo if equipped)

Back View Of the PCM Connector C2


Object Number: 477055  Size: CF

Connector Part Information

    • 1.6L VIN 6 Powertrain
    • 26 Pin Gray Connector C2 with Blue Terminal Secondary Lock Insert

Pin

Wire Color

Function

C2-1

LT BLU

IAT Sensor Input

C2-2

ORN/BLK

ECT Sensor Input

C2-3

--

Not Used

C2-4

BLU/BLK

Ignition Positive Voltage

C2-5

PPL/GRN

MAF Sensor Ground

C2-6

BLK/GRN

Ground

C2-7

BLU/ORN

PSP Switch Idle-Up Signal

C2-8

RED/WHT

MAP Sensor Input

C2-9

RED/GRN

TP Sensor Input

C2-10

PPL/WHT

MAF Sensor Input

C2-11

RED

HO2S 1 Signal

C2-12

--

HO2S 1 Sensor Shield Ground

C2-13

GRY/RED

TP Sensor Reference Voltage

C2-14

WHT/RED

MAP Sensor Reference Voltage

C2-15

BLU/BLK

Ignition Positive Voltage

C2-16

--

Not Used

C2-17

BLK/BLU

Ground

C2-18

BLK/YEL

Crank Signal

C2-19

--

Not Used

C2-20

BLK/WHT

Ignition Positive Voltage

C2-21

GRY/YEL

TP Sensor Ground

C2-22

BLU/RED

MAP Sensor Ground

C2-23

BLU

ECT Sensor Ground

C2-24

GRY/YEL

HO2S 1 Sensor Ground

C2-25

BLU/WHT

IAT Sensor Ground

C2-26

PPL/RED

CMP Sensor Ground

Back View Of the PCM Connector C4


Object Number: 477057  Size: CF

Connector Part Information

    • 1.6L VIN 6 Powertrain
    • 30 Pin Gray Connector C4 with Green Terminal Secondary Lock Insert

Pin

Wire Color

Function

C4-1

PNK/BLK

Fuel Injector #2 Control

C4-2

PNK

Fuel Injector #1 Control

C4-3

LT GRN/BLK

IAC Valve Coil Control

C4-4

GRY

HO2S 1 Heater Control

C4-5

PPL/RED

EVAP Canister Vent Solenoid Control

C4-6

GRN/WHT

EVAP Tank Pressure Control Solenoid Valve Control

C4-7

RED

4WD Actuator Control

C4-8

PNK/BLU

Fuel Injector #4 Control

C4-9

PNK/GRN

Fuel Injector #3 Control

C4-10

PPL/YEL

IAC Valve Coil Control

C4-11

GRY/BLU

IAC Valve Coil Control

C4-12

PPL/BLK

IAC Valve Coil Control

C4-13

LT GRN/RED

EGR Valve Coil Control

C4-14

LT GRN/YEL

EGR Valve Coil Control

C4-15

LT GRN/WHT

EGR Valve Coil Control

C4-16

LT GRN

EGR Valve Coil Control

C4-17

GRN/BLK

EVAP Canister Purge Valve Control

C4-18

BLK/ORN

4WD Signal

C4-19

WHT/BLU

CKP Sensor Signal High

C4-20

ORN/BLU

CKP Sensor Signal Low

C4-21

BRN/YEL

Ignition Coil #4 Control

C4-22

BRN/WHT

Ignition Coil #3 Control

C4-23

BRN/BLK

Ignition Coil #2 Control

C4-24

BRN

Ignition Coil #1 Control

C4-25

BLU/YEL

VSS Signal

C4-26

YEL/BLU

CMP Sensor Signal

C4-27

PNK

4WD Actuator Control

C4-28

BLK/BLU

Ground

C4-29

BLK/GRN

DLC Ground

C4-30

--

CKP Sensor Shielded Ground