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: 655733  Size: CH

Connector Part Information

    • 12191489
    • 80-Way F Micro-Pack 100W Sealed (BU)

Pin

Wire Color

Circuit No.

Function

1

BK/WH

351

Ground

2

L-GN

1867

12-Volt Reference

3

BK

1744

Fuel Injector 1 Control

4

L-BU/BK

844

Fuel Injector 4 Control

5

TN/WH

332

Oil Pressure Sensor Signal

6

--

--

Not Used

7

YE/BK

1275

5-Volt Reference

8

GY

705

5-Volt Reference

9

D-GN

2362

CAN Serial Data Low

10

YE

2361

CAN Serial Data High

11

--

--

Not Used

12

D-BU/WH

1869

CKP Sensor Signal

13-17

--

--

Not Used

18

D-BU

84

Cruise Control Set/Coast Switch Signal

19

PK

439

Ignition 1 Voltage

20

OG

440

Battery Positive Voltage

21

YE/BK

1868

Low Reference

22

GY/BK

87

Cruise Control Resume/Accel Switch Signal

23

--

--

Not Used

24

BK

407

Low Reference

25

OG/BK

469

Low Reference

26-28

--

--

Not Used

29

PK

5349

Auxiliary Cooling Fan

30

L-GN

1478

Coolant Level Switch Signal

31

D-GN

534

High Idle Switch Signal

32

BN

2524

Generator 2 Turn On Signal

33

PU

420

TCC Brake Switch/Cruise Control Release Signal

D-GN

1433

Clutch Start Switch Signal

34

OG/BK

1786

Park/Neutral Signal

35

--

--

Not Used

36

L-GN/BK

1745

Fuel Injector 2 Control

37

BK/WH

846

Fuel Injector 6 Control

38-39

--

--

Not Used

40

BK/WH

351

Ground

41

BN

1271

Low Reference

42

--

--

Not Used

43

D-BU/WH

878

Fuel Injector 8 Control

44

PK/BK

1746

Fuel Injector 3 Control

45

TN

1274

5-Volt Reference

46

WH/BK

1164

5-Volt Reference

47

WH/BK

596

5-Volt Reference

48

TN

2917

5-Volt Reference

49-51

--

--

Not Used

52

L-BU

506

Glow Plug Signal

53

--

--

Not Used

54

PU

1272

Low Reference

55

L-BU

1162

APP Sensor 2 Signal

56

--

--

Not Used

57

OG

440

Battery Positive Voltage

58

D-GN

1049

ECM/PCM/VCM Class 2 Serial Data

59

--

--

Not Used

60

TN

413

HO2S Low Reference

61

PK/BK

632

Low Reference

62

L-GN

24

Backup Lamp Supply Voltage

63

BK

407

Low Reference

64

BK

552

Low Reference

65

GY

1273

Low Reference

66-69

--

--

Not Used

70

BN

1174

Oil Level Switch Signal

71

L-GN

488

PTO On Switch-Signal

72

L-GN

2081

Exhaust Brake Switch

73

BN/WH

633

CMP Sensor Signal

74

YE

410

ECT Sensor Signal

75

PK

1020

Off/Run/Crank Voltage

76

YE/BK

846

Fuel Injector 6 Control

77

RD/BK

877

Fuel Injector 7 Control

78

BN

5347

Intake Air Heater

79

GY/BK

2219

FICM Relay Control

80

GY

720

Low Reference

Engine Control Module (ECM) C2


Object Number: 684875  Size: CH

Connector Part Information

    • 12191488
    • 80-Way F Micro-Pack 100W Sealed (CL)

Pin

Wire Color

Circuit No.

Function

1

BK/WH

351

Ground

2-3

--

--

Not Used

4

YE

447

Starter Relay Coil Control

5

--

--

Not Used

6

YE

505

Glow Plug Relay Control

7

PU

2656

Engine Exhaust Brake Restore Request

8

--

--

Not Used

9

D-GN/WH

465

Fuel Pump Relay Control - Primary

10

WH

121

Engine Speed Signal

11

--

--

Not Used

12

D-GN

1163

APP Sensor 3 Signal

13

YE

2522

PTO Feedback

14

L-GN

432

MAP Sensor Signal

15

BN

25

Charge Indicator Control

16

GY

397

Cruise Control On Switch Signal

17

D-GN/WH

762

A/C Request Signal

18

L-BU

1320

CHMSL Supply Voltage/Stop Lamp Supply Voltage

19

--

--

Not Used

20

D-GN

2222

Signal Low - Rear (ML6)

21

L-BU

2221

Signal High - Rear

22

--

--

Not Used

23

OG/BK

2919

Low Reference

24

D-BU

1161

APP Sensor 1 Signal

25

YE

1578

Fuel Temperature Signal

26-28

--

--

Not Used

29

GY

597

5-Volt Reference

30-33

--

--

Not Used

34

D-GN/WH

459

A/C Compressor Clutch Relay Control

35

--

--

Not Used

36

D-BU

507

Wait to Start Indicator Control

37

PU

2562

PTO Control

38

RD

2013

High Idle Indicator Control

39

RD

631

12-Volt Reference

40

BK/WH

351

Ground

41

GY/BK

2931

MAF Ground

42

PU/WH

2530

Fuel Pressure Regulator Solenoid Supply Voltage

43

--

--

Not Used

44

PK

339

Ignition 1 Voltage

45

--

--

Not Used

46

BN/WH

419

MIL Control

47-48

--

--

Not Used

49

YE/BK

1827

Vehicle Speed Signal

50

D-GN/WH

817

Vehicle Speed Signal

51

TN

472

IAT Sensor Signal

52

GY

23

Generator Field Duty Cycle Signal

53

--

--

Not Used

54

PU

1589

Fuel Level Sensor Signal - Primary

55

D-GN

603

Low Coolant Indicator Control

56

L-BU

494

Primary Brake Indicator Control

57

BK

470

Low Reference

58

YE

2918

FRP Sensor Signal

59

PU

420

TCC Brake Switch/Cruise Control Release Signal

60

BN

718

Low Reference

61

--

--

Not Used

62

PK

5349

Intake Heater

63

--

--

Not Used

64

GY/BK

433

BARO Sensor Signal

65

YE

492

MAF Sensor Signal

66-72

--

--

Not Used

73

D-BU

1936

Fuel Level Sensor Signal - Secondary

74-75

--

--

Not Used

76

L-BU

2832

Engine Speed Signal

77

YE

2834

Fuel Pressure Regulator Solenoid Control

78

OG/BK

1057

Low Reference

79-80

--

--

Not Used