GM Service Manual Online
For 1990-2009 cars only
Table 1: Ambient Air Temperature Sensor
Table 2: Backup Lamp Switch
Table 3: Camshaft Position (CMP) Sensor
Table 4: Camshaft Position (CMP) Actuator Solenoid Valve
Table 5: Circuit Opening Relay
Table 6: Clutch Pedal Position (CPP) Switch
Table 7: Crankshaft Position (CKP) Sensor
Table 8: Engine Coolant Temperature (ECT) Sensor
Table 9: EFI Relay
Table 10: EVAP Purge Solenoid Valve
Table 11: EVAP System Vacuum Leak Pump
Table 12: Auxiliary Intake Air Solenoid Valve
Table 13: Fuel Injector #1
Table 14: Fuel Injector #2
Table 15: Fuel Injector #3
Table 16: Fuel Injector #4
Table 17: Fuel Sender Assembly
Table 18: Heated Oxygen Sensor (HO2S) 1
Table 19: Heated Oxygen Sensor (HO2S) 2
Table 20: Idle Air Control (IAC) Motor
Table 21: Ignition Coil 1
Table 22: Ignition Coil 2
Table 23: Ignition Coil 3
Table 24: Ignition Coil 4
Table 25: Knock Sensor (KS)
Table 26: Mass Air Flow (MAF) Sensor
Table 27: Noise Filter
Table 28: PCM Connector C1
Table 29: PCM Connector C2
Table 30: PCM Connector C3
Table 31: PCM Connector C4
Table 32: Rocker Arm Oil Control Valve
Table 33: Secondary Air Injection (AIR) Pump Motor
Table 34: Secondary AIR Pump Relay
Table 35: Secondary AIR Pump Pressure Sensor
Table 36: Secondary AIR Pump Solenoid Valve
Table 37: Throttle Position (TP) Sensor
Table 38: Vehicle Speed Sensor (VSS)

Ambient Air Temperature Sensor


Object Number: 334404  Size: CH

Connector Part Information

    • 90980-11030
    • BK

Pin

Wire Color

Function

1

BK

Ambient Air Temperature Sensor Input

2

BK/BU

Ground

Backup Lamp Switch


Object Number: 334404  Size: CH

Connector Part Information

    • 90980-11250
    • GY

Pin

Wire Color

Function

1

RD/BK

Backup Lamp Switch Signal Circuit

2

RD/WH

Backup Lamp Switch Feed Circuit

Camshaft Position (CMP) Sensor


Object Number: 339853  Size: CH

Connector Part Information

    • 90980-10947
    • BK

Pin

Wire Color

Function

1

BK

Camshaft Position Input

2

WH

Sensor Ground

Camshaft Position (CMP) Actuator Solenoid Valve


Object Number: 820095  Size: CH

Connector Part Information

    • 90980-11162
    • BN

Pin

Wire Color

Function

1

YE

CMP Actuator High Control

2

BK/YE

CMP Actuator Low Control

Circuit Opening Relay


Object Number: 660786  Size: CH

Connector Part Information

--

Pin

Wire Color

Function

1

BK

Relay Coil Supply Voltage

2

GN/RD

Relay Coil Control

3

BK/RD

Switch Fuel Pump

5

WH/BK

Switch Supply Voltage

Clutch Pedal Position (CPP) Switch


Object Number: 820095  Size: CH

Connector Part Information

    • 90980-10825
    • WH

Pin

Wire Color

Function

1

RD

CPP Feed Circuit

2

BK

CPP Signal Circuit

Crankshaft Position (CKP) Sensor


Object Number: 339853  Size: CH

Connector Part Information

    • 90980-10947
    • GY

Pin

Wire Color

Function

1

BK

Crankshaft Position Input

2

WH

Sensor Ground

Engine Coolant Temperature (ECT) Sensor


Object Number: 820010  Size: CH

Connector Part Information

    • 90980-10737
    • D-GY

Pin

Wire Color

Function

1

BN

Sensor Ground

2

WH

ECT Input

EFI Relay


Object Number: 660786  Size: CH

Connector Part Information

--

Pin

Wire Color

Function

1

BK/WH

Relay Coil Supply Voltage

2

WH/BK

Relay Coil Control

3

BK

Switch Load

5

RD/WH

Switch Supply Voltage

EVAP Purge Solenoid Valve


Object Number: 339854  Size: CH

Connector Part Information

    • 90980-11156
    • BU

Pin

Wire Color

Function

1

BU/BK

EVAP Control Circuit

2

BK

EVAP Feed Circuit

EVAP System Vacuum Leak Pump


Object Number: 1489449  Size: CH

Connector Part Information

    • 90980-12380
    • BK

Pin

Wire Color

Function

1

GY

Vacuum Pump Control

2

BN

Sensor Ground

3

BU

Fuel Tank Pressure (FTP) Input

4

YE

5-Volt Reference

5

--

Not Used

6

WH/BK

Ground

7

--

Not Used

8

RD

EVAP Vent Solenoid Control

9

BK

EVAP Vent Solenoid Supply Voltage

10

--

Not Used

Auxiliary Intake Air Solenoid Valve


Object Number: 820255  Size: CH

Connector Part Information

    • 90980-11149
    • BN

Pin

Wire Color

Function

1

BU/WH

Ignition Positive Voltage

2

BK

Solenoid Control Circuit

Fuel Injector #1


Object Number: 334996  Size: CH

Connector Part Information

    • 90980-11875
    • GY

Pin

Wire Color

Function

1

BK/WH

Fuel Injector #1 Feed Circuit

2

YE

Fuel Injector #1 Control Circuit

Fuel Injector #2


Object Number: 334996  Size: CH

Connector Part Information

    • 90980-11875
    • GY

Pin

Wire Color

Function

1

BK/WH

Fuel Injector #2 Feed Circuit

2

BK

Fuel Injector #2 Control Circuit

Fuel Injector #3


Object Number: 334996  Size: CH

Connector Part Information

    • 90980-11875
    • GY

Pin

Wire Color

Function

1

BK/WH

Fuel Injector #3 Feed Circuit

2

WT

Fuel Injector #3 Control Circuit

Fuel Injector #4


Object Number: 334996  Size: CH

Connector Part Information

    • 90980-11875
    • GY

Pin

Wire Color

Function

1

BK/WH

Fuel Injector #4 Control Circuit

2

BU

Fuel Injector #4 Feed Circuit

Fuel Sender Assembly


Object Number: 334997  Size: CH

Connector Part Information

    • 90980-11077
    • WH

Pin

Wire Color

Function

1

--

Not Used

2

YE

Fuel Gage

3

BN

Low Fuel Indicator

4

BK/RD

Fuel Pump Feed Circuit

5

WH/BK

Ground

Heated Oxygen Sensor (HO2S) 1


Object Number: 820019  Size: CH

Connector Part Information

    • 90980-10794
    • D-GY

Pin

Wire Color

Function

1

BK

HO2S1 Heater Feed Circuit

2

PK

HO2S1 Heater Control Circuit

3

BN

Ground

4

RD

HO2S1 Input

Heated Oxygen Sensor (HO2S) 2


Object Number: 820103  Size: CH

Connector Part Information

    • 90980-11399
    • D-GY

Pin

Wire Color

Function

1

BK

HO2S2 Heater Feed Circuit

2

PK/BK

HO2S2 Heater Control Circuit

3

BN

Ground

4

WH

HO2S2 Input Circuit

Idle Air Control (IAC) Motor


Object Number: 339851  Size: CH

Connector Part Information

    • 90980-11145
    • GY

Pin

Wire Color

Function

1

BK/BU

IAC Valve Open Control

2

BK

IAC Feed Circuit

3

WH/BK

Ground

Ignition Coil 1


Object Number: 820192  Size: CH

Connector Part Information

    • 90980-11885
    • BN

Pin

Wire Color

Function

1

BK/WH

Ignition Coil Feed Circuit

2

BU/YE

Ignition Fail Safe Input

3

RD/BU

Ignition Trigger Circuit

4

WH/BK

Ground

Ignition Coil 2


Object Number: 820192  Size: CH

Connector Part Information

    • 90980-11885
    • BN

Pin

Wire Color

Function

1

BK/WH

Ignition Coil Feed Circuit

2

BU/YE

Ignition Fail Safe Input

3

YE/GN

Ignition Trigger Circuit

4

WH/BK

Ground

Ignition Coil 3


Object Number: 820192  Size: CH

Connector Part Information

    • 90980-11885
    • BN

Pin

Wire Color

Function

1

BK/WH

Ignition Coil Feed Circuit

2

BU/YE

Ignition Fail Safe Input

3

GY

Ignition Trigger Circuit

4

WH/BK

Ground

Ignition Coil 4


Object Number: 820192  Size: CH

Connector Part Information

    • 90980-11885
    • BN

Pin

Wire Color

Function

1

BK/WH

Ignition Coil Feed Circuit

2

BU/YE

Ignition Fail Safe Input

3

WH

Ignition Trigger Circuit

4

WH/BK

Ground

Knock Sensor (KS)


Object Number: 334996  Size: CH

Connector Part Information

    • 90980-11875
    • BK

Pin

Wire Color

Function

1

WH

KS Signal Low

2

BK

KS Signal High

Mass Air Flow (MAF) Sensor


Object Number: 820101  Size: CH

Connector Part Information

    • 90980-11317
    • BK

Pin

Wire Color

Function

1

BK

MAF Feed Circuit

2

BU/WH

MAF Signal Low

3

GN

MAF Signal High

4

YE/BK

IAT Sensor Input

5

BN

Sensor Ground

Noise Filter


Object Number: 820022  Size: CH

Connector Part Information

    • 90980-10843
    • GY

Pin

Wire Color

Function

1

BK/WH

Noise Filter Feed Circuit

2

--

Not Used

PCM Connector C1


Object Number: 820235  Size: CH

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 High Control

14

YE

Camshaft Position (CMP) Actuator Solenoid Valve Control Low

15

BU/WH

Auxiliary Intake Air Control Solenoid Control

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

22-23

--

Not Used

24

BU/YE

Ignition Fail Safe Input

25

RD

EVAP Canister Vent Solenoid Valve Control

26

BK

Camshaft Position (CMP) Sensor Input

27

BK

Crankshaft Position (CKP) Sensor Input

28

BN

Sensor Ground

29

BU/WH

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

PCM Connector C2


Object Number: 820243  Size: CH

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

10-15

--

Not Used

16

BU/YE

Rocker Arm Oil Control Solenoid Valve Control High

17

BK

Rocker Arm Oil Control Solenoid Valve Control Low

18

--

Not Used

19

BU/BK

EVAP Canister Purge Solenoid Valve Control

20

--

Not Used

21

L-GN

Fan 1 Relay Control

22

RD

Heated Oxygen Sensor (HO2S) 1 Input

23-26

--

Not Used

27

YE

AC Pressure Switch

28

WH/BK

Ground

29

--

Not Used

30

BU/RD

Power Steering Pressure (PSP) Switch Input

31-35

--

Not Used

PCM Connector C3


Object Number: 820244  Size: CH

Connector Part Information

    • 35-Pin
    • WH

Pin

Wire Color

Function

1-2

--

Not Used

3

BK

Engine Speed Output

4

BK/WH

EFI Relay High Control

5

YE/BK

AC Compressor Clutch Relay Control

6-7

--

Not Used

8

BU/WH

Crusie Control Idle

9-13

--

Not Used

14

YE/RD

Engine Coolant Temperature Gage Output

15

BU/RD

Serial Data

16

GN/RD

Circuit Opening Relay Control

17

PU/WH

Vehicle Speed Sensor (VSS) Input

18

--

Not Used

19

GN/WH

Brake Switch Signal

20-22

--

Not Used

23

WH

Heated Oxygen Sensor (HO2S) 2 Input

24-30

--

Not Used

31

BK/WH

Rocker Arm Oil Pressure Switch Input

32

BK/BU

Evaporator Temperature Sensor Input

33

GN/WH

AC On Signal

34

GN

Secondary AIR Pressure Sensor Input

35

--

Not Used

PCM Connector C4


Object Number: 820233  Size: CH

Connector Part Information

    • 31-Pin
    • WH

Pin

Wire Color

Function

1

BK

Ignition Positive Voltage

2

--

Not Used

3

RD/WH

Battery Voltage

4

BK/BU

Secondary AIR Solenoid Valve Control

5

BK/OG

Secondary AIR Pump Relay Control

6

--

Not Used

7

PK/BK

Heated Oxygen Sensor (HO2S) 2 Heater Circuit Control

8

--

Not Used

9

BK/OG

Ignition Positive Voltage

10

YE

AC Request Signal

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

Data Link Connector (DLC)

20

PK/BK

Diagnostic Request Circuit

21

BU

Fuel Tank Pressure (FTP) Sensor Input

22-31

--

Not Used

Rocker Arm Oil Control Valve


Object Number: 820255  Size: CH

Connector Part Information

    • 90980-11162
    • BK

Pin

Wire Color

Function

1

BK

Solenoid Control Low

2

WH

Solenoid Control Low

Secondary Air Injection (AIR) Pump Motor


Object Number: 820254  Size: CH

Connector Part Information

    • 90980-10845
    • BK

Pin

Wire Color

Function

A

BK/RD

Supply Voltage

B

WH/BK

Ground

Secondary AIR Pump Relay


Object Number: 741234  Size: CH

Connector Part Information

    • 90980-10845
    • BK

Pin

Wire Color

Function

1

BK/OG

Relay Coil Control

2

BK

Relay Coil Supply Voltage

3

BK/RD

Switch AIR Pump Motor

4

BK

Switch Supply Voltage

Secondary AIR Pump Pressure Sensor


Object Number: 335016  Size: CH

Connector Part Information

    • 90980-10845
    • BK

Pin

Wire Color

Function

1

BN

Ground

2

L-GN

Powertrain Control Module Signal

3

YE

5-Volt Reference

Secondary AIR Pump Solenoid Valve


Object Number: 339854  Size: CH

Connector Part Information

    • 90980-10572
    • BU

Pin

Wire Color

Function

1

BK

Supply Voltage

2

BK/BU

Powertrain Control Module Signal

Throttle Position (TP) Sensor


Object Number: 339857  Size: CH

Connector Part Information

    • 90980-11261
    • BK

Pin

Wire Color

Function

1

BN

Sensor Ground

2

YE

Reference Voltage

3

L-GN

Throttle Position Input

Vehicle Speed Sensor (VSS)


Object Number: 820010  Size: CH

Connector Part Information

    • 90980-11156
    • BK

Pin

Wire Color

Function

1

BK

Sensor Ground

2

WH

VSS Input