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: 1590596  Size: CH

Connector Part Information

  • OEM: 13588763
  • Service: 88988931
  • Description: 73-Way F 0.64 2.8 Series, Sealed (BK)

Terminal Part Information

  • Pins: 7, 20
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: J/J
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 9, 12, 13, 18, 19, 26, 33, 34, 35, 36, 37, 40, 44, 47, 48, 49, 53, 54, 55
  • Terminal/Tray: 33467-0003/23
  • Core/Insulation Crimp: H/H
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

Engine Control Module (ECM) C1

Pin

Wire Color

Circuit No.

Function

1

OG/BK

1786

Park/Neutral Signal

2-8

--

--

Not Used

9

WH

17

Stop Lamp Switch Signal

10

PU

3120

HO2S High Signal Sensor 2

11

TN/WH

3121

HO2S Low Signal Sensor 2

12

OG/BK

380

A/C Refrigerant Pressure Sensor Signal

13

TN

5514

Low Reference

14-15

--

--

Not Used

16

PU

30

Fuel Level Sensor Signal

17

D-BU

473

High Speed Cooling Fan Relay Control

18

D-BU

5985

Accessory Wake Up Serial Data

19

PK

439

Ignition 1 Voltage

20

RD/WH

540

Battery Positive Voltage

21-22

--

--

Not Used

23

PU

1272

Low Reference

24

D-GN

890

Fuel Tank Pressure Sensor Signal

25

BN

436

AIR Pump Relay Control

26

--

--

Not Used

27

TN

2501

High Speed GMLAN Serial Data Bus-

28

TN/BK

2500

High Speed GMLAN Serial Data Bus +

29

D-BU

1161

APP Sensor 1 Signal

30

BN

1271

Low Reference

31

TN

2759

Low Reference

32

L-BU

1162

APP Sensor 2 Signal

33

GY

2709

5-Volt Reference 1

34

GY

2700

5-Volt Reference 1

35

--

--

Not Used

36

TN

1274

5-Volt Reference 1

37

TN/BK

472

IAT Sensor Signal

38

TN

2760

Low Reference

39-40

--

--

Not Used

41

YE

492

MAF Sensor Signal

42-46

--

--

Not Used

47

PK/BK

5290

Ignition 1 Voltage

48-49

--

--

Not Used

50

D-GN/WH

465

Fuel Pump Relay Control

51

--

--

Not Used

52

YE

447

Starter Relay Coil Control

53-55

--

--

Not Used

56

WH/BK

1164

5-Volt Reference 2

57

--

--

Not Used

58

D-GN

335

Low Speed Cooling Fan Relay Control

59

BN

5069

PWR/TRN Relay Control

60

--

--

Not Used

61

WH

1310

EVAP Canister Vent Solenoid Control

62

--

--

Not Used

63

D-GN/WH

459

A/C Compressor Clutch Relay Control

64

--

--

Not Used

65

GY/WH

3122

HO2S Heater Low Control Sensor 2

66-67

--

--

Not Used

68

BN/WH

419

MIL Control

69-72

--

--

Not Used

73

BK/WH

451

Ground

Engine Control Module (ECM) C2


Object Number: 1650398  Size: CH

Connector Part Information

  • OEM: 13581626
  • Service: 19115670
  • Description: 80-Way F 0.64 2.8 Series, Sealed (GY)

Terminal Part Information

  • Pins: 1, 14, 17, 23, 27, 33, 35, 39, 42, 43, 46, 59, 62, 63, 67
  • Terminal/Tray: 33467-0003/23
  • Core/Insulation Crimp: H/H
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 24, 29, 32, 40, 44, 48, 49, 52, 60, 64, 66, 68, 69, 71, 72
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: J/J
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 73
  • Terminal/Tray: 7116-4152-02/9
  • Core/Insulation Crimp: 2/5
  • Release Tool/Test Probe: 12094430/J-35616-4A (PU)

Engine Control Module (ECM) C2

Pin

Wire Color

Circuit No.

Function

1

GY

474

5-Volt Reference

2

PU/WH

6270

5-Volt Reference 2

3

GY

2701

5-Volt Reference 2

4

--

--

Not Used

5

YE

581

TAC Motor Control - 1

6

BN

582

TAC Motor Control - 2

7

--

429

Not Used

8

D-GN/WH

428

EVAP Canister Purge Solenoid Control

9-11

--

--

Not Used

12

GY/WH

3113

HO2S Heater Low Control Sensor 1

13-15

--

--

Not Used

16

BN

2198

Camshaft Position Actuator Solenoid High Control

17

L-GN/BK

1745

Fuel Injector 2 Control

18

YE/BK

846

Fuel Injector 6 Control

19

TN/WH

845

Fuel Injector 5 Control

20

TN

1744

Fuel Injector 1 Control

21

YE

410

ECT Sensor Signal

22

TN

2761

Low Reference

23-25

--

--

Not Used

26

D-BU

496

KS 1 Signal

27

GY

1716

KS 1 Signal

28

--

--

Not Used

29

L-BU

1876

KS 2 Signal

30

GY

2303

KS 2 Signal

31

--

--

Not Used

32

GY

23

Generator Field Duty Cycle Signal

33

BN

1174

Oil Level Switch Signal

34

BK

2755

Low Reference

35

TN

2752

Low Reference

36

--

--

Not Used

37

L-BU/BK

844

Fuel Injector 4 Control

38-39

--

--

Not Used

40

PK/BK

1746

Fuel Injector 3 Control

41

GY

2705

5-Volt Reference 1

42

--

--

Not Used

43

GY

2704

5-Volt Reference 1

44

D-BU

6259

5-Volt Reference 1

45-49

--

--

Not Used

50

TN/WH

331

Oil Pressure Sensor Signal

51

--

476

Not Used

52

TN

2199

Low Reference

53

OG/BK

469

Low Reference

54-55

--

--

Not Used

56

TN/WH

3111

HO2S Low Signal Sensor 1

57

PU/WH

3110

HO2S High Signal Sensor 1

58

L-GN

432

MAP Sensor Signal

59-60

--

--

Not Used

61

OG

225

Generator Turn On Signal

62

--

--

Not Used

63

PU

486

TP Sensor 2 Signal

64

BN/WH

633

CMP Sensor Signal

65

D-GN

485

TP Sensor 1 Signal

66

PK/BK

632

Low Reference

67

--

5268

Not Used

68

WH/BK

6271

CKP Sensor Signal

69

GY/BK

6272

Low Reference

70

PU

2121

IC 1 Control

71

OG/WH

2122

IC 2 Control

72

L-BU

2123

IC 3 Control

73-77

--

--

Not Used

78

YE

2174

Low Reference

79-80

--

--

Not Used