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

Engine Control Module (ECM) - C1


Object Number: 1544242  Size: CH

Connector Part Information

  • OEM: 15438366
  • Service: 89046933
  • Description: 96-Way F Sealed (BK)

Terminal Part Information

  • Terminal/Tray: 1928498135/19
  • Core/Insulation Crimp: Pins 1-3, 8, 9, 25-27, 31, 49-51, 60, 73-75, 77, 84 - See Terminal Repair Kit
  • Core/Insulation Crimp: Pins 6, 7, 10-13, 15, 18- 21, 23, 24, 30, 32, 34, 37-42, 44, 47, 48, 53, 55-58, 61-63, 65-68, 71, 72, 76, 78, 79, 82, 85, 86, 88, 92, 96 - P/P
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

Engine Control Module (ECM) - C1

Pin

Wire Color

Circuit No.

Function

1

GY

5421

Injector Positive Voltage Control Group 1 (Early Production)

OG

5421

Injector Positive Voltage Control Group 1 (Late Production)

2

D-BU/WH

878

Fuel Injector 8 Control

3

RD/BK

877

Fuel Injector 7 Control

4-5

--

--

Not Used

6

OG/BK

469

Low Reference

7

PU

806

Crank Voltage

8

YE

2522

PTO Engage Signal

9

BN

1174

Oil Level Switch Signal

10

GY/BK

87

Cruise Control Resume/Accel Switch Signal

11

YE/BK

6272

Low Reference (Early Production)

GY

6272

Low Reference (Late Production)

12

GY

2704

5-Volt Reference

13

TN

5928

5-Volt Reference

14

--

--

Not Used

15

GY

2705

5-Volt Reference

16-17

--

--

Not Used

18

YE

492

MAF Sensor Signal

19

L-GN

432

MAP Sensor Signal

20

YE

5947

Turbocharger Vane Position Sensor Signal

21

L-BU

1162

APP Sensor 2 Signal

22

--

--

Not Used

23

BK

2755

Low Reference

24

PU/WH

2530

Fuel Pressure Regulator Solenoid Supply Voltage

25

PK

5425

Injector Positive Voltage Control Group 4

26

YE/BK

846

Fuel Injector 6 Control

27

PK/BK

1746

Fuel Injector 3 Control

28

--

--

Not Used

29

BN

25

Charge Indicator Control (8X5)

30

OG/BK

2919

Low Reference

31

L-BU

494

Engine Shutoff Signal (PTO w/A/T)

32

GY

48

CPP Switch Signal

33

--

--

Not Used

34

D-BU

84

Cruise Control Set/Coast Switch Signal

35-36

--

--

Not Used

37

GY

2703

5-Volt Reference

38

TN

1274

5-Volt Reference

39

TN

2917

5-Volt Reference

40

L-GN

6270

5-Volt Reference (Early Production)

PU/WH

6270

5-Volt Reference (Late Production)

41

D-BU

6259

5-Volt Reference

42

TN

472

IAT Sensor Signal

43

--

--

Not Used

44

TN/WH

332

Oil Pressure Sensor Signal

45-46

--

--

Not Used

47

GY

720

Low Reference

48

D-BU

5930

Turbocharger Vane Position Control Solenoid Valve High Control

49

PU

5423

Injector Positive Voltage Control Group 3

50

BK/WH

845

Fuel Injector 5 Control

51

L-BU/BK

844

Fuel Injector 4 Control

52

--

--

Not Used

53

YE/BK

6120

Low Reference

54

--

--

Not Used

55

GY/BK

2931

Low Reference

56

D-BU/WH

6265

CMP Sensor Signal

57

GY/BK

1694

4WD Low Signal

58

L-GN

1478

Coolant Level Switch Signal

59

--

--

Not Used

60

L-GN

488

PTO On Switch Signal

61

GY

397

Cruise Control ON Switch Signal

62

BK

552

Low Reference

63

OG/BK

5929

Low Reference

64

--

--

Not Used

65

L-BU

6118

IAT Sensor 2 Signal

66

--

--

Not Used

67

BN/WH

5763

EGR Valve Position Signal

68

YE

410

ECT Sensor Signal

69-70

--

--

Not Used

71

YE/BK

625

Starter Enable Relay Control

72

YE

2834

Fuel Pressure Regulator Solenoid Control

73

YE

5422

Injector Positive Voltage Control Group 2

74

BK

1744

Fuel Injector 1 Control

75

L-GN/BK

1745

Fuel Injector 2 Control

76

PK

1039

Ignition 1 Voltage

77

OG

440

Battery Positive Voltage

78

PU

1272

Low Reference

79

D-BU/WH

6271

CKP Sensor Signal (Early Production)

WH/BK

6271

CKP Sensor Signal (Late Production)

80-81

--

--

Not Used

82

BK/WH

1695

Axle Switch Signal

83

--

--

Not Used

84

GY

1524

Backup Lamp Supply Voltage

85

YE/BK

508

Water In Fuel Indicator Control

86

BK

2754

Low Reference

87

--

--

Not Used

88

PK/BK

6266

Low Reference (Early Production)

BN

6266

Low Reference (Late Production)

89-91

--

--

Not Used

92

YE

2918

FRP Sensor Signal

93-95

--

--

Not Used

96

WH

5931

Turbocharger Vane Position Control Solenoid Valve Low Control

Engine Control Module (ECM) - C2


Object Number: 1544260  Size: CH

Connector Part Information

  • OEM: 15462694
  • Service: 88988935
  • Description: 58-Way F Sealed (BK)

Terminal Part Information

  • Pins: 1, 2, 3, 4, 5, 6
  • Terminal/Tray: 1928498059/24
  • Core/Insulation Crimp: C/5
  • Release Tool/Test Probe: J-38125-561/J-35616- 35(VT)
  • Terminal/Tray: 1928498135/19
  • Core/Insulation Crimp: Pins 9, 12, 13, 15, 16, 19, 21, 22, 27, 29-31, 33-36, 40, 42, 44-50, 54-58 - P/P
  • Core/Insulation Crimp: Pins 18, 23, 24, 38, 39 - See Terminal Repair Kit
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

Engine Control Module (ECM) - C2

Pin

Wire Color

Circuit No.

Function

1

PK

339

Ignition 1 Voltage

2

BK/WH

451

Ground

3

PK

339

Ignition 1 Voltage

4

BK/WH

451

Ground

5

PK

339

Ignition 1 Voltage

6

BK/WH

451

Ground

7-8

--

--

Not Used

9

D-GN

1049

Class 2 Serial Data

10-11

--

--

Not Used

12

D-GN/WH

465

Fuel Pump Relay Control

13

BK

2751

Low Reference

14

--

--

Not Used

15

WH/BK

1164

5-Volt Reference

16

D-BU

507

Wait to Start Indicator Control

17

--

--

Not Used

18

PU

2562

PTO Control (PTO)

19

GY/BK

2219

ECM Relay Control

20

--

--

Not Used

21

PK

439

Ignition 1 Voltage

22

L-BU

1320

CHMSL Supply Voltage

23

BN

25

Charge Indicator Control

24

BN

2524

Generator 2 Turn On Signal (8X5/YF2)

25-26

--

--

Not Used

27

GY

2700

5-Volt Reference

28

--

--

Not Used

29

BN

1271

Low Reference

30

BN/WH

419

MIL Control

31

D-GN/WH

459

A/C Compressor Clutch Relay Control

32

--

--

Not Used

33

OG/BK

5764

EGR Motor High Control

34

BK

470

Low Reference

35

RD/BK

380

A/C Refrigerant Pressure Sensor Signal

36

PU/WH

1589

Fuel Level Sensor Signal - Primary (Early Production)

PU

1589

Fuel Level Sensor Signal - Primary (Late Production)

37

--

--

Not Used

38

GY

23

Generator Field Duty Cycle Signal

39

OG/BK

1786

Park/Neutral Signal (MW7)

40

PU

420

TCC Brake Switch/Cruise Control Release Switch Signal

41

--

--

Not Used

42

D-GN/WH

817

Vehicle Speed Signal

43

--

--

Not Used

44

TN

2501

High Speed GMLAN Serial Data Bus -

45

PU/WH

821

VSS High Signal (ML6)

45

YE

400

VSS High Signal (MW7)

46

L-GN/BK

5746

EGR Motor Low Control

47

BN

6062

Low Reference

48

YE

1578

Fuel Temperature Signal

49

D-BU

1161

APP Sensor 1 Signal

50

D-BU

1936

Fuel Level Sensor Signal - Secondary (Except NQZ)

51-53

--

--

Not Used

54

YE/BK

1827

Vehicle Speed Signal

55

WH

121

Engine Speed Signal

56

PK

1020

Ignition 0 Voltage

57

BN/WH

2500

High Speed GMLAN Serial Data Bus + (Early Production)

BN

2500

High Speed GMLAN Serial Data Bus + (Late Production)

58

L-GN/BK

822

VSS Low Signal (ML6)