GM Service Manual Online
For 1990-2009 cars only
Table 1: Engine Control Module (ECM) C1
Table 2: Engine Control Module (ECM) C2
Table 3: Engine Control Module (ECM) C3

Engine Control Module (ECM) C1


Object Number: 1228485  Size: CH

Connector Part Information

    • 15491996
    • 56-Way F Micro-Pack 64 Series, Sealed (BU)

Pin

Wire Color

Circuit No.

Function

1

TN/WH

2500

High Speed GMLAN Serial Data Bus (+)

2

TN

2501

High Speed GMLAN Serial Data Bus (-)

3

--

--

Not Used

4

BN/WH

419

MIL Control

5-6

--

--

Not Used

7

BN

1271

Low Reference

8

PU

1272

Low Reference

9

--

--

Not Used

10

YE

5991

Powertrain Relay Coil Control

11-12

--

--

Not Used

13

YE/BK

625

Starter Enable Relay Control

14

PK

839

Ignition 1 Voltage

15

YE

710

Class 2 Serial Data

16

D-GN

1049

Class 2 Serial Data

17

GY

397

Cruise Control On Switch Signal

18

PK

1020

Ignition 0 Voltage

19

PK

439

Ignition 1 Voltage

20

OG

240

Battery Positive Voltage

21

D-GN/WH

817

Vehicle Speed Signal

22

D-BU

1161

APP Sensor 1 Signal

23

D-BU

2364

Cooling Fan Speed Signal

24

D-GN

890

Fuel Tank Pressure Sensor Signal

25

--

--

Not Used

26

RD/BK

380

A/C Refrigerant Pressure Sensor Signal

27

D-BU

84

Cruise Control Set/Coast Switch Signal

28

--

--

Not Used

29

TN

1274

5-Volt Reference

30

GY

2700

5-Volt Reference

31

GY

2709

5-Volt Reference

32

L-BU

1320

CHMSL Supply Voltage

33

GY/BK

87

Cruise Control Resume/Accel Switch Signal

34

--

--

Not Used

35

WH/BK

1164

5-Volt Reference

36

WH/BK

2366

Cooling Fan Clutch Control

37

PU

1589

Fuel Level Sensor Signal

38-40

--

--

Not Used

41

L-BU

1162

APP Sensor 2 Signal

42-44

--

--

Not Used

45

D-GN/WH

465

Fuel Pump Relay Control

46

PU

420

TCC Brake Switch/Cruise Control Release Signal

47

--

--

Not Used

48

WH

121

Engine Speed Signal

49

YE/BK

1827

Vehicle Speed Signal

50

--

--

Not Used

51

OG/BK

1786

Ignition Lock Cylinder Control Actuator Signal

52

PU

806

Crank Voltage

53

--

--

Not Used

54

WH

1310

EVAP Canister Vent Solenoid Control

55

BK

2751

Low Reference

56

--

--

Not Used

Engine Control Module (ECM) C2


Object Number: 1335545  Size: CH

Connector Part Information

    • 15481009
    • 73-Way F GT 280 Series, Sealed (BK)

Pin

Wire Color

Circuit No.

Function

1

L-GN

3212

HO2S Heater Low Control - Bank 2 Sensor 1

2

BK/WH

3113

HO2S Heater Low Control - Bank 1 Sensor 1

3

--

--

Not Used

4

D-BU/WH

878

Fuel Injector 8 Control

5

BK

1744

Fuel Injector 1 Control

6

L-GN/BK

1745

Fuel Injector 2 Control

7

RD/BK

877

Fuel Injector 7 Control

8

L-BU/BK

844

Fuel Injector 4 Control

9

PK/BK

1746

Fuel Injector 3 Control

10

BK/WH

845

Fuel Injector 5 Control

11-12

--

--

Not Used

13

YE/BK

846

Fuel Injector 6 Control

14

YE/BK

1868

Low Reference

15

PK/BK

632

Low Reference

16

BN

2129

Low Reference

17-19

--

--

Not Used

20

OG/BK

469

Low Reference

21

BK

2755

Low Reference

22-23

--

--

Not Used

24

TN/WH

332

Oil Pressure Sensor Signal

25

--

--

Not Used

26

BN/WH

633

CMP Sensor Signal

27-28

--

--

Not Used

29

PU

486

TP Sensor 2 Signal

30

--

--

Not Used

31

D-GN

485

TP Sensor 1 Signal

32-34

--

--

Not Used

35

GY

2704

5-Volt Reference

36

BK/WH

1704

Low Reference

37

GY

2705

5-Volt Reference

38-40

--

--

Not Used

41

L-BU/BK

1688

5-Volt Reference

42

--

--

Not Used

43

L-GN

1867

12-Volt Reference

44

RD

631

12-Volt Reference

45

GY

23

Generator Field Duty Cycle Signal

46

L-GN

432

MAP Sensor Signal

47

--

--

Not Used

48

PU/WH

1665

HO2S High Signal - Bank 1 Sensor 1

49

TN

1664

HO2S Low Signal - Bank 1 Sensor 1

50

D-GN/WH

428

EVAP Canister Purge Solenoid Control

51

PU

1666

HO2S High Signal - Bank 2 Sensor 1

52

BK

2761

Low Reference

53

RD

2127

IC 7 Control

54

PU

2121

IC 1 Control

55

YE

410

ECT Sensor Signal

56

RD

225

Generator Turn On Signal

57

L-BU/WH

2126

IC 6 Control

58

D-GN/WH

2124

IC 4 Control

59

D-GN

2125

IC 5 Control

60

BN

582

TAC Motor Control - 2

61

L-BU

2123

IC 3 Control

62

D-BU/WH

1869

CKP Sensor Signal

63

YE

581

TAC Motor Control - 1

64

BN/WH

2130

Low Reference

65

PU/WH

2128

IC 8 Control

66

RD/WH

2122

IC 2 Control

67

--

--

Not Used

68

D-BU

496

Knock Sensor 1 Signal

69

GY

1716

Low Reference

70

TN

1667

HO2S Low Signal - Bank 2 Sensor 1

71

GY

2303

Low Reference

72

L-BU

1876

Knock Sensor 2 Signal

73

BK

450

Ground

Engine Control Module (ECM) C3


Object Number: 1228487  Size: CH

Connector Part Information

    • 15481007
    • 56-Way F Micro 64 Series, Sealed (GY)

Pin

Wire Color

Circuit No.

Function

1

--

--

Not Used

2

BN

2391

HO2S Heater Low Control - Bank 1 Sensor 2

3

RD/WH

3223

HO2S Heater Low Control - Bank 2 Sensor 2

4-10

--

--

Not Used

11

YE

492

MAF Sensor Signal

12-17

--

--

Not Used

18

TN/WH

1669

HO2S Low Signal - Bank 1 Sensor 2

19

PU/WH

1668

HO2S High Signal - Bank 1 Sensor 2

20

PU

1670

HO2S High Signal - Bank 2 Sensor 2

21

TN

1671

HO2S Low Signal - Bank 2 Sensor 2

22-23

--

--

Not Used

24

BK

2760

Low Reference

25-28

--

--

Not Used

29

GY/BK

1694

4WD Low Signal

30-32

--

--

Not Used

33

GY

2365

Low Reference

34

TN

472

IAT Sensor Signal

35

GY

597

5-Volt Reference

36-44

--

--

Not Used

45

YE

400

Signal High - Front

46-48

--

--

Not Used

49

BK

2759

Low Reference

50

--

--

Not Used

51

D-GN/WH

459

A/C Compressor Clutch Relay Control

52-56

--

--

Not Used