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

Engine Control Module (ECM) C1


Object Number: 1497745  Size: CF

Connector Part Information

    • AMP 368376
    • 81-Way F 81POS Receptac;e Hsg Assembly (BK)

Pin

Wire Color

Circuit Number

Function

1

--

--

Not Used

2

BK

251

Ground

3

D-BU

426

Idle Motor Feed

4

OG

440

Battery Positive Voltage

5

OG/BK

425

Idle Motor Return

6

D-GN

817

Vehicle Speed Signal

7

D-BU/BK

480

Rough Road Signal

8

PU/WH

1665

Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 Signal

9

D-GN/WH

1664

Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2 Signal

10

YE

492

Mass Air Flow (MAF) Sensor Signal

11

D-GN/WH

1456

Exhaust Gas Recirculation (EGR) Valve Position Sensor Signal

12

L-GN

432

Manifold Absolute Pressure (MAP) Sensor Signal

13

RD/BK

380

A/C Pressure Sensor Signal

14-16

--

--

Not Used

17

D-BU/WH

1936

Fuel Level Sensor Signal

18

BN/WH

633

Camshaft Position (CMP) Sensor Signal

19

D-BU/WH

1869

Crankshaft Position (CKP) Signal

20

--

--

Not Used

21

RD

427

Idle Switch Position

22

WH/BK

1922

CAN Serial Data Low

23

D-GN/BK

2905

Serial Data

24

D-BU/BK

844

Fuel Injector 4 Control

25

D-GN/WH

762

A/C Request Signal

26

PU

1666

Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1 Signal

27

D-GN

1663

Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 Signal

28

D-BU/WH

417

Idle Motor Position Signal

29

D-GN

534

Throttle Position (TP) Sensor Signal

30

--

--

Not Used

31

BN

472

Intake Air Temperature (IAT) Sensor Signal

32-35

--

--

Not Used

36

YE

410

Engine Coolant Temperature (ECT) Sensor Signal

37

--

--

Not Used

38

YE/BK

1868

Low Reference

39

--

--

Not Used

40

WH/BK

448

Keyword Serial Data

41

YE/BK

1921

CAN Serial Data High

42

YE/BK

846

Fuel Injector 6 Control

43

L-GN/BK

1745

Fuel Injector 2 Control

44

BK/WH

1057

Shield Ground

45-47

--

--

Not Used

48

GY/BK

469

5-Volt Reference

49

GY

416

5-Volt Reference

50

GY

474

5-Volt Reference

51

GY/BK

605

Low Reference

52

D-GN

890

Fuel Tank Pressure (FTP) Sensor Signal

53-59

--

--

Not Used

60

GY/BK

435

Exhaust Gas Recirculation (EGR) Solenoid Control

61

D-BU/WH

845

Fuel Injector 5 Control

62

BK

1744

Fuel Injector 1 Control

63

D-BU/WH

1876

Knock Sensor 2 Signal

64

WH

496

Knock Sensor 1 Signal

65

BK

470

Low Reference

66

D-BU/BK

650

Low Reference

67

BK

750

Low Reference

68

L-BU/BK

808

Low Reference

69

YE/BK

452

Low Reference

70

D-BU/BK

632

Low Reference

71

BK/WH

645

Low Reference

72-75

--

--

Not Used

76

GN

1704

Low Reference

77

--

--

Not Used

78

BK/WH

251

Ground

79

PK/D-BU

539

Ignition 1 Voltage

80

D-GN/WH

428

EVAP Canister Purge Valve Solenoid Control

81

RD/BK

1746

Fuel Injector 3 Control

Engine Control Module (ECM) C2


Object Number: 1497768  Size: CF

Connector Part Information

    • AMP 368383
    • 40-Way F 40POS Receptacle Hsg Assembly (BK)

Pin

Wire Color

Circuit Number

Function

82

--

--

Not Used

83

BK/WH

251

Ground

84

--

--

Not Used

85

D-GN

135

Engine Coolant Temperature (ECT) Sensor Signal

86-87

--

--

Not Used

88

BK/WH

251

Ground

89

BN

1667

Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1 Heater Control

90-91

--

--

Not Used

92

PU/WH

1885

MIL Control

93

D-GN

335

Low Speed Cooling Fan Relay Control

94

WH/BK

1655

Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2 Heater Control

95-96

--

--

Not Used

97

BN/WH

1653

Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 Heater Control

98

--

--

Not Used

99

D-GN/WH

465

Fuel Pump Relay Control

100

--

--

Not Used

101

WH

121

Engine Speed Signal

102

D-BU

473

High Speed Cooling Fan Relay Control

103-104

--

--

Not Used

105

WH

1654

Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1 Heater Control

106

PU/WH

67

A/C Clutch Relay Control

107

YE

130

Fuel Level Sensor Signal

108

WH/BK

962

Intake Manifold Tuning Valve Solenoid Control

109

--

--

Not Used

110

OG/BK

1029

Main Relay Control

111-112

--

--

Not Used

113

PU

1986

EVAP Canister Vent Solenoid Control

114

BK

350

Ground

115

L-BU

1153

Ignition Coil 1 Control

116

D-BU

1154

Ignition Coil 2 Control

117

D-GN

1157

Ignition Coil 5 Control

118

GY

1158

Ignition Coil 6 Control

119

PK/BK

1846

Main Relay Voltage

120

RD

1156

Ignition Coil 4 Control

121

YE

1155

Ignition Coil 3 Control