GM Service Manual Online
For 1990-2009 cars only
Table 1: Accel Sensor
Table 2: Ambient Temperature Meter (ATM) Sensor
Table 3: Automatic Transmission Modulator
Table 4: Engine Control Module C1
Table 5: Electronic Control Module C2
Table 6: ECM Engine Stop Relay
Table 7: Engine Coolant Temperature Sensor
Table 8: Engine Speed Sensor
Table 9: Fuel Pressure Sensor
Table 10: Fuel Sender (Single Fuel Tank)
Table 11: LH Fuel Sender (Dual Fuel Tank)
Table 12: RH Fuel Tank Sender (Dual Fuel Tank)
Table 13: Fuel Sender and Transfer Pump Control Module
Table 14: Fuel Transfer Pump
Table 15: Fuel Transfer Pump Relay
Table 16: Fuel Temperature Sensor
Table 17: Glow Plug Relay C1
Table 18: Glow Plug Relay C2
Table 19: High Idle Switch
Table 20: Injection Pump Speed Sensor
Table 21: Low Coolant Level Indicator Switch
Table 22: Multifunction Alarm Module (MFAM) C2 (KPJ)
Table 23: Pressure Control Valve 1
Table 24: Pressure Control Valve 2
Table 25: Pressure Control Valve Relay
Table 26: Speedo Adaptor
Table 27: Turbo Boost Pressure Sensor
Table 28: Vehicle Speed Sensor (Automatic)
Table 29: Vehicle Speed Sensor (Manual)

Accel Sensor


Object Number: 237082  Size: CH

Connector Part Information

    • 6 Way
    • Female

Pin

Wire Color

Circuit No.

Function

A

BLK

283

Ground

B

WHT

281

Accelerator Pedal Signal

C

RED

282

Accelerator Pedal Signal Supply

D

BLU

289

Ground

E

GRN

287

Accelerator Pedal Signal

F

YEL

288

Accelerator Pedal Signal Supply

Ambient Temperature Meter (ATM) Sensor


Object Number: 236598  Size: CH

Connector Part Information

    • 2 Way Female
    • (GRY)

Pin

Wire Color

Circuit No.

Function

A

BLU/WHT

20

ATM Temperature Sensor Signal

B

BLU/BLK

21

Low Reference

Automatic Transmission Modulator


Object Number: 68721  Size: CH

Connector Part Information

    • 15300027
    • 2 Way F Metri-Pack 280 Series, Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

BRN

323

Automatic Transmission Modulator Relay Signal

B

BLK

150

Ground

Engine Control Module C1


Object Number: 339162  Size: CH

Connector Part Information

    • 40 Way
    • Female

Pin

Wire Color

Circuit No.

Function

1-3

--

--

Not Used

4

BLU/YEL

52

Exhaust Brake Relay Control

5-6

--

--

Not Used

7

BLU/YEL

42

Clutch Switch Signal

8-9

--

--

Not Used

10

PNK/GRN

34

Fast Idle-Up

11-12

--

--

Not Used

13

RED

9

Ignition 1 Voltage

14

WHT/RED

126

ECM Engine Stop Relay Signal

15-18

--

--

Not Used

19

PNK

23

Ground

20

BLU

51

Exhaust Brake Relay Signal

21

BRN

53

Pressure Control Valve 1 Control

22

BRN

54

Pressure Control Valve 1 Control

23

RED

10

Ignition 1 Voltage

24

YEL

49

Crank Voltage

25

LT GRN/RED

22

Ground

26

RED

27

Ignition 1 Voltage

27

RED/BLK

21

Ground

28

--

--

Not Used

29

PNK/BLK

35

Fast Idle-Down

30

YEL/BLK

94

Engine Coolant Temperature Sensor Signal

31

BRN/BLK

55

Pressure Control Valve 2 Control

32

BRN/BLK

56

Pressure Control Valve 2 Control

33-35

--

--

Not Used

36

BLK/WHT

120

Automatic Transmission Selector Possition Signal (MF1)

37-38

--

--

Not Used

39

LT BLU

20

Multifunction Alarm Module Signal

40

--

--

Not Used

Electronic Control Module C2


Object Number: 339160  Size: CH

Connector Part Information

    • 80 Way
    • Female

Pin

Wire Color

Circuit No.

Function

41

WHT

36

Accelerator Pedal Sensor Signal

42

GRN

39

Accelerator Pedal Sensor Signal

43

--

--

Not Used

44

RED

37

Accelerator Pedal Sensor Supply Voltage

45

GRY

114

Accelerator Pedal Sensor Low Reference

46

GRY

117

Accelerator Pedal Sensor Low Reference

47

--

--

Not Used

48

WHT

73

Engine Speed Sensor Signal

49

RED

69

Injection Pump Speed Sensor Signal

50-51

--

--

Not Used

52

BLU/RED

97

Fuel Temperature Sensor Signal

53

BLU/WHT

92

ATM Temperature Sensor Signal

54

YEL

40

Accelerator Pedal Sensor Supply Voltage

55

BLK

106

Fuel Pressure Sensor Low Reference

56

BLK

108

Turbocharger Boost Pressure Sensor Low Reference

57

BLK

72

Engine Speed Sensor Signal

58

GRN

68

Injection Pump Speed Sensor Signal

59

--

--

Not Used

60

WHT

30

Check Connector Signal

61

WHT

99

Turbocharger Boost Pressure Sensor Signal

62

RED

65

Fuel Pressure Sensor

63-65

--

--

Not Used

66

BLU/BLK

95

Engine Coolant Temperature Sensor

67-68

--

--

Not Used

69

WHT

19

Engine Speed Reference (Tach)

70

--

--

Not Used

71

RED

107

Fuel Pressure Sensor Signal

72

RED

100

Turbocharger Boost Pressure Sensor Supply Voltage

73

WHT

63

Fuel Pressure Sensor Supply Voltage

74-75

--

--

Not Used

76

GRY

110

Engine Speed Sensor Shield

77

GRY

109

Injection Pump Speed Sensor Shield

78-79

--

--

Not Used

80

BLK

61

Ground

81

BLK

57

Ground

82

BLK

58

Ground

83-84

--

--

Not Used

85

BLU/RED

90

Cylinder 4 Injector

86

BLU/WHT

87

Cylinder 2 Injector

87

BLU

85

Cylinder 6 Injector

88

GRN/RED

82

Cylinder 3 Injector

89

GRN/WHT

79

Cylinder 5 Injector

90

GRN

77

Cylinder 1 Injector

91

RED/WHT

2

Ignition Main Relay Signal

92-93

--

--

Not Used

94

BLU/RED

91

Cylinder 4 Injector

95

BLU/WHT

88

Cylinder 2 Injector

96

BLU

86

Cylinder 6 Injector

97

GRN/RED

83

Cylinder 3 Injector

98

GRN/WHT

80

Cylinder 5 Injector

99

GRN

78

Cylinder 1 Injector

100

RED/YEL

76

Cylinder 5 Injector and Cylinder 1 Injector

101

RED/WHT

3

Ignition Main Relay Signal

102

BLK

59

Ground

103-105

--

--

Not Used

106

BRN/WHT

16

Service Engine Soon Lamp Control

107

--

--

Not Used

108

RED/BLK

50

Automatic Transmission Modulator Relay Control

109

YEL

6

Ignition Main Relay Supply Voltage

110

RED/YEL

81

Cylinder 3 Injector

111

BLK

60

Ground

112

--

--

Not Used

113

WHT/RED

28

Data Link Connector

114

WHT

29

Data Link Connector

115-117

--

--

Not Used

118

YEL

5

Ignition Main Relay Supply Voltage

119

RED/BLU

84

Cylinder 6 Injector and Cylinder 2 Injector

120

RED/BLU

89

Cylinder 4 Injector

ECM Engine Stop Relay


Object Number: 39670  Size: CH

Connector Part Information

    • 12129716
    • 4 Way F Metri-Pack 280 Series, Flexlock, Sealed (GRY)

Pin

Wire Color

Circuit No.

Function

30

WHT

125

Stop Lamp Switch Signal

85

RED/WHT

127

Ignition Main Relay Signal

86

BLK

128

Ground

87

WHT/RED

126

ECM Engine Stop Relay Signal

Engine Coolant Temperature Sensor


Object Number: 516611  Size: CH

Connector Part Information

    • 3 Way
    • Female

Pin

Wire Color

Circuit No.

Function

A

YEL/BLK

35

Engine Coolant Temperature Sensor Signal

B

GRN

37

Engine Coolant Temperature Sensor Signal (to IP Cluster)

C

BLU/BLK

36

Low Reference

Engine Speed Sensor


Object Number: 236598  Size: CH

Connector Part Information

    • 2 Way
    • Female

Pin

Wire Color

Circuit No.

Function

A

BLK

14

Engine Speed Sensor Signal

B

WHT

15

Engine Speed Sensor Signal

Fuel Pressure Sensor


Object Number: 240168  Size: CH

Connector Part Information

    • 3 Way
    • Female

Pin

Wire Color

Circuit No.

Function

A

BLK

7

Ground

B

RED

9

Fuel Pressure Sensor Signal

C

WHT

8

Fuel Pressure Sensor Supply Voltage

Fuel Sender (Single Fuel Tank)


Object Number: 38608  Size: CH

Connector Part Information

    • 12162189
    • 4 Way F Metri-Pack 150.2 Series Pull To Seat, Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

BLK

350

Ground

B-C

--

--

Not Used

D

PPL

30

Fuel Gauge Sensor Signal

LH Fuel Sender (Dual Fuel Tank)


Object Number: 38608  Size: CH

Connector Part Information

    • 12162189
    • 4 Way F Metri-Pack 150.2 Series Pull To Seat, Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

BLK

350

Ground

B-C

--

--

Not Used

D

DK BLU

1936

LH Fuel Gauge Sensor Signal

RH Fuel Tank Sender (Dual Fuel Tank)


Object Number: 38608  Size: CH

Connector Part Information

    • 12162189
    • 4 Way F Metri-Pack 150.2 P2S, Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

BLK

350

Ground

B-C

--

--

Not Used

D

DK BLU

1937

RH Fuel Gauge Sensor Signal

Fuel Sender and Transfer Pump Control Module


Object Number: 73212  Size: CH

Connector Part Information

    • 12059573
    • 6 Way F Metri-Pack 280 Series, Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

PNK

139

Ignition 1 Voltage

B

LT BLU

1937

RH Fuel Gauge Sensor Signal

C

DK BLU

1936

LH Fuel Gauge Sensor Signal

D

LT GRN

497

Fuel Pump Relay Control

E

BLK

350

Ground

F

PPL

30

Fuel Gauge Sensor Signal

Fuel Transfer Pump


Object Number: 258174  Size: CH

Connector Part Information

    • 12010973
    • 2 Way M Weather Pack (BLK)

Pin

Wire Color

Circuit No.

Function

A

BLK

350

Ground

B

GRY

120

Fuel Pump Motor Supply Voltage

Fuel Transfer Pump Relay


Object Number: 39670  Size: CH

Connector Part Information

    • 12129716
    • 4 Way F Metri-Pack 280 Series, Flexlock, Sealed (GRY)

Pin

Wire Color

Circuit No.

Function

30

PNK

139

Ignition 1 Voltage

85

PNK

139

Ignition 1 Voltage

86

LT GRN

497

Fuel Pump Relay Control

87

GRY

120

Fuel Pump Motor Supply Voltage

Fuel Temperature Sensor


Object Number: 236598  Size: CH

Connector Part Information

    • 2 Way
    • Female

Pin

Wire Color

Circuit No.

Function

A

BLU/RED

38

Fuel Temperature Sensor Signal

B

BLU/BLK

39

Low Reference

Glow Plug Relay C1


Object Number: 236009  Size: CH

Connector Part Information

    • 2 Way
    • Female

Pin

Wire Color

Circuit No.

Function

A

RED

50

Battery Positive Voltage

B

RED/BLK

45

CGlow Plug Supply Voltage

Glow Plug Relay C2


Object Number: 236009  Size: CH

Connector Part Information

    • 2 Way
    • Female

Pin

Wire Color

Circuit No.

Function

A

BLK

49

Ground

B

BLK/RED

48

Glow Plug Supply Voltage

High Idle Switch


Object Number: 378928  Size: CH

Connector Part Information

    • 6 Way
    • Female

Pin

Wire Color

Circuit No.

Function

1

PNK/BLK

240

Idle Control Down

2

RED

238

Ignition 1 Voltage

3

PNK/GRN

239

Idle Control Up

4-6

--

--

Not Used

Injection Pump Speed Sensor


Object Number: 236598  Size: CH

Connector Part Information

    • 2 Way
    • Female

Pin

Wire Color

Circuit No.

Function

A

GRN

11

Injection Pump Speed Sensor Signal

B

RED

12

Injection Pump Speed Sensor Signal

Low Coolant Level Indicator Switch


Object Number: 236598  Size: CH

Connector Part Information

    • 12052641
    • ASM 2 Way F Metri-Pack 150 Series, Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

LT GRN

1478

Low Coolant Sensor Signal

B

BLK

150

Ground

Multifunction Alarm Module (MFAM) C2 (KPJ)


Object Number: 280782  Size: CH

Connector Part Information

    • 12064760
    • 4 Way F Metri-Pack 150 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

LT BLU

252

Engine Shutdown Alarm Signal

B-C

--

--

Not Used

D

GRY

65

Automatice Engine Shutdown Engine Coolant Temperature Switch Signal

Pressure Control Valve 1


Object Number: 235949  Size: CH

Connector Part Information

    • 2 Way
    • Female

Pin

Wire Color

Circuit No.

Function

A

GRN

1

Pressure Control Valve Relay Voltage Supply

B

BRN

3

Pressure Control Valve 1 Control

Pressure Control Valve 2


Object Number: 235949  Size: CH

Connector Part Information

    • 2 Way
    • Female

Pin

Wire Color

Circuit No.

Function

A

GRN

2

Pressure Control Valve Relay Voltage Supply

B

BRN/BLK

5

Pressure Control Valve 2 Control

Pressure Control Valve Relay


Object Number: 39670  Size: CH

Connector Part Information

    • 12129716
    • 4 Way F Metri-Pack 280 Series, Flexlock, Sealed (GRY)

Pin

Wire Color

Circuit No.

Function

30

RED

7

Ignition 1 Voltage

85

RED/BLK

12

Battery Positive Voltage

86

BLK

14

Ground

87

GRN

8

Pressure Control Valve Relay Voltage Supply

Speedo Adaptor


Object Number: 73152  Size: CH

Connector Part Information

    • 12084944
    • 16 F MIC/P 100 (BLK)

Pin

Wire Color

Circuit No.

Function

A1

GRY/BLK

418

Rear Axle-Two Speed Switch Signal

A2-A8

--

--

Not Used

B1

BRN

421

Ignition 1 Voltage

B2

PPL/WHT

425

Vehicle Speed Sensor Signal

B3

LT GRN/BLK

426

Vehicle Speed Sensor

B4

--

--

Not Used

B5

BLK

428

Ground

B6-B7

--

--

Not Used

B8

WHT

422

Speedometer Signal

Turbo Boost Pressure Sensor


Object Number: 339127  Size: CH

Connector Part Information

    • 12186893
    • 3 Way Female

Pin

Wire Color

Circuit No.

Function

1

GRY

596

5 Volt Reference

2

BLK

808

Sensor Return

3

WHT

900

Turbo Boost Pressure Signal

Vehicle Speed Sensor (Automatic)


Object Number: 35437  Size: CH

Connector Part Information

    • 12052644
    • 2 Way F Metri-Pack 150 Series (GRY)

Pin

Wire Color

Circuit No.

Function

A

PPL/WHT

821

Vehicle Speed Sensor Signal

B

LT GRN/BLK

822

Vehicle Speed Sensor Signal

Vehicle Speed Sensor (Manual)


Object Number: 523620  Size: CH

Connector Part Information

    • 3 Way Female
    • (GRN)

Pin

Wire Color

Circuit No.

Function

A

LT GRN/BLK

24

Vehicle Speed Sensor Signal

B

PPL/WHT

25

Vehicle Speed Sensor Signal

C

PNK

26

Ignition 1 Voltage