GM Service Manual Online
For 1990-2009 cars only
Table 1: Engine Control Module C1
Table 2: Electronic Control Module C2

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 Signal

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

121

Ignition 1 Voltage (MF1)

27

RED/BLK

21

Ground

28

--

--

Not Used

29

PNK/BLK

35

Fast Idle Control

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 Signal (MF1)

37-38

--

--

Not Used

39

LT BLU

20

Multifunction Alarm Module Signal (KPJ)

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

BLK

38

Low Reference

46

BLU

41

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

Low Reference

56

BLK

108

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 Pin-D

61

WHT

99

Turbocharger Boost Pressure Sensor Signal

62

RED

65

Fuel Pressure Sensor Signal

63-65

--

--

Not Used

66

BLU/BLK

95

Low Reference

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 Signal

73

WHT

63

Fuel Pressure Sensor Signal

74-75

--

--

Not Used

76

GRY

110

Shield

77

GRY

109

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 Control

86

BLU/WHT

87

Cylinder 2 Injector Control

87

BLU

85

Cylinder 6 Injector Control

88

GRN/RED

82

Cylinder 3 Injector Control

89

GRN/WHT

79

Cylinder 5 Injector Control

90

GRN

77

Cylinder 1 Injector Control

91

RED/WHT

2

Ignition Main Relay Contact

92-93

--

--

Not Used

94

BLU/RED

91

Cylinder 4 Injector Control

95

BLU/WHT

88

Cylinder 2 Injector Control

96

BLU

86

Cylinder 6 Injector Control

97

GRN/RED

83

Cylinder 3 InjectorControl

98

GRN/WHT

80

Cylinder 5 Injector Control

99

GRN

78

Cylinder 1 Injector Control

100

RED/YEL

76

Cylinder 1 and Cylinder 5 Injector Supply Voltage

101

RED/WHT

3

Ignition Main Relay Signal

102

BLK

59

Ground

103-105

--

--

Not Used

106

BRN/WHT

16

Service Engine Soon Indicator 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 Supply Voltage

111

BLK

60

Ground

112

--

--

Not Used

113

LT GRN

28

SAE J1708 Serial Data B

114

BLU

29

SAE J1708 Serial Data A

115-117

--

--

Not Used

118

YEL

5

Ignition Main Relay Supply Voltage

119

RED/BLU

84

Cylinder 2 and Cylinder 6 Injector Supply Voltage

120

RED/BLU

89

Cylinder 4 Injector Supply Voltage