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

    • 15357147
    • 56-Way F Micro 64 (BU)

Pin

Wire Color

Circuit No.

Function

1

YE

2361

SAE J1939 Serial Data Bus +

2

D-GN

2362

SAE J1939 Serial Data Bus -

3-4

--

--

Not Used

5

OG

440

Battery Positive Voltage

6

--

--

Not Used

7

OG/BK

1057

Low Reference

8

PK/BK

632

Low Reference

9

BK/WH

451

Ground

10

PK

439

Ignition 1 Voltage

11-12

--

--

Not Used

13

YE

492

MAF Sensor Signal

14

BN/WH

5763

EGR Valve Position Signal

15

D-GN

1049

Class 2 Serial Data

16

--

--

Not Used

17

TN

1274

5-Volt Reference

18

PK

1020

Ignition 0 Voltage

19

PK

439

Ignition 1 Voltage

20

OG

440

Battery Positive Voltage

21

GY

2700

5-Volt Reference

22

--

--

Not Used

23

OG/BK

5929

5-Volt Reference

24-25

--

--

Not Used

26

D-BU

507

Wait to Start Indicator Control

27

--

--

Not Used

28

L-BU

1162

APP Sensor 2 Signal

29

--

--

Not Used

30

PU/WH

1589

Fuel Level Sensor Signal - Primary

31

WH/BK

2932

5-Volt Reference

32

WH/BK

1164

5-Volt Reference

33

TN

2917

5-Volt Reference

34

GY

2705

5-Volt Reference

35

--

--

Not Used

36

YE/BK

1275

5-Volt Reference

37

YE

2834

Fuel Pressure Regulator Solenoid Control

39

GY

597

5-Volt Reference

40

PU/WH

2530

Fuel Pressure Regulator Solenoid Supply Voltage

41

GY

23

Generator Field Duty Cycle Signal

42

PK

1039

Ignition 1 Voltage

43

D-BU

1936

Fuel Level Sensor Signal - Secondary

44

D-GN/WH

465

Fuel Pump Relay Control

45

--

--

Not Used

46

YE/BK

1827

Vehicle Speed Signal

47

GY

2703

5-Volt Reference

48-49

--

--

Not Used

50

RD

631

12-Volt Reference

51

YE

2834

Fuel Pressure Regulator Solenoid Control

52

GY/BK

2219

FICM Relay Control

53

D-GN/WH

817

Vehicle Speed Signal

54

PU/WH

2530

Fuel Pressure Regulator Solenoid Supply Voltage

55

--

--

Not Used

56

PK

1039

Ignition 1 Voltage

Engine Control Module (ECM) - C2


Object Number: 1228486  Size: CH

Connector Part Information

    • 15357131
    • 73-Way F Micro 64 (BK)

Pin

Wire Color

Circuit No.

Function

1

--

--

Not Used

2

OG/BK

2919

Low Reference

3

--

--

Not Used

4

BN

25

Charge Indicator Control

5-6

--

--

Not Used

7

GY/BK

1694

4WD Low Signal

8

BK

2754

Low Reference

9-12

--

--

Not Used

13

BK

2751

Low Reference

14

GY

720

Low Reference

15-16

--

--

Not Used

17

YE/BK

508

Water in Fuel Indicator Control

18

--

--

Not Used

19

D-BU

1161

APP Sensor 1 Signal

20

--

--

Not Used

21

D-BU

2466

Trans MIL Request

22

--

--

Not Used

23

L-GN

432

Turbocharger Boost Sensor Signal

24

D-GN

1163

APP Sensor 3 Signal

25

TN/WH

332

Oil Pressure Sensor Signal

26

BN

1174

Oil Level Switch Signal

27

YE

1578

Fuel Temperature Signal

28

L-GN

1867

12-Volt Reference

29

GY/BK

2931

Low Reference

30

OG/BK

469

Low Reference

31

YE

5947

Turbocharger Vane Position Sensor Signal

32

--

--

Not Used

33

OG/BK

5764

EGR Motor High Control

34

--

--

Not Used

35

L-GN/ BK

5746

EGR Motor Low Control

36

BK/WH

451

Ground

37

--

--

Not Used

38

L-GN

1478

Coolant Level Switch Signal

39

BK

2755

Low Reference

40

BN

1271

Low Reference

41

--

--

Not Used

42

YE

2918

FRP Sensor Signal

43

--

--

Not Used

44

TN

5928

Low Reference

45

--

--

Not Used

46

GY/BK

433

Baro Sensor Signal

47-48

--

--

Not Used

49

D-BU

5930

Turbocharger Vane Position Control Solenoid Valve Control

50

WH

5931

Low Reference

51

--

--

Not Used

52

PK/BK

1746

Fuel Injector 3 Control

53

OG/BK

5764

EGR Motor High Control

54

PU

1272

Low Reference

55

L-GN/ BK

5746

EGR Motor Low Control

56

GY

1273

Low Reference

57

BN

2524

Generator 2 Turn on Signal

58

BK

552

Low Reference

59

--

--

Not Used

60

L-BU

1320

CHMSL Supply Voltage

61

PU

420

TCC Brake Switch/Cruise Control Release Signal

62

--

--

Not Used

63

L-BU

2832

Engine Speed Signal

64

BK

470

Low Reference

65

L-GN/BK

1745

Fuel Injector 2 Control

66

RD/BK

877

Fuel Injector 7 Control

67

YE

410

ECT Sensor Signal

68

D-BU/WH

878

Fuel Injector 8 Control

69

L-BU/BK

844

Fuel Injector 4 Control

70

BK/WH

845

Fuel Injector 5 Control

71

YE/BK

846

Fuel Injector 6 Control

72

BK

1744

Fuel Injector 1 Control

73

BK/WH

451

Ground

Engine Control Module (ECM) - C3


Object Number: 1228487  Size: CH

Connector Part Information

    • 15357148
    • 56-Way F Micro 64 (GY)

Pin

Wire Color

Circuit No.

Function

1

L-BU

494

PTO Engine Kill Signal (PTO)

2-5

--

--

Not Used

6

L-GN

488

PTO on Switch Signal (PTO)

7

--

--

Not Used

8

BK/WH

1695

Front Axle Switch Signal

9

--

--

Not Used

10

PK

1039

Ignition 1 Voltage

11

--

--

Not Used

12

PU/WH

821

VSS High Signal (ML6)

YE

400

VSS High Signal (M74)

13

--

--

Not Used

14

PK

1039

Ignition 1 Voltage

15-16

--

--

Not Used

17

YE

2522

PTO Engage Signal (PTO)

18

PU

806

Crank Voltage

19

D-BU

84

Cruise Control Set/Coast Switch Signal

20-21

--

--

Not Used

22

GY/BK

87

Cruise Control Resume/Accel Switch Signal

23

L-GN/BK

822

VSS Low Signal (ML6)

24

TN

472

IAT Sensor Signal

25-29

--

--

Not Used

30

GY

397

Cruise Control on Switch Signal

31

OG/BK

1786

Park/Neutral Signal

32

--

--

Not Used

33

RD/BK

380

A/C Refrigerant Pressure Sensor Signal

34

--

--

Not Used

35

YE/BK

625

Starter Enable Relay Control

36

--

--

Not Used

37

WH

121

Engine Speed Signal

38

--

--

Not Used

39

PU

2562

PTO Control (PTO)

40

BN/WH

419

MIL Control

41

D-GN/WH

459

A/C Compressor Clutch Relay Control

42

--

--

Not Used

43

YE/BK

1868

Low Reference

44

BK/WH

451

Ground

45

GY

1524

Backup Lamp Supply Voltage

46

--

--

Not Used

47

GY

48

CPP Switch Signal

48

BN

718

Low Reference

49-50

--

--

Not Used

51

BN/WH

633

CMP Sensor Signal

52

D-BU/WH

1869

CKP Sensor Signal

53-56

--

--

Not Used