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

Electronic Control Module (ECM) - C1


Object Number: 1590592  Size: CH

Connector Part Information

  • OEM: 12582677
  • Service: 88988931
  • Description: 73-Way F Receptacle 0.64 2.8 Sealed (BK)

Terminal Part Information

  • Pins: 1, 9, 10, 11, 12, 13, 16, 17, 18, 19, 20, 23, 24, 27, 28, 29, 30, 31, 32, 33, 34, 36, 37, 38, 41, 47, 50, 52, 56, 58, 59, 61, 63, 65, 68
  • 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: 7116-4151-02/9
  • Core/Insulation Crimp: E/1
  • Release Tool/Test Probe: 12094430/J-35616-4A (PU)

Electronic 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 or Stop Lamp Supply Voltage

10

PU/WH

1668

HO2S High Signal Sensor (Bank 1 Sensor 2)

11

TN/WH

1669

HO2S Low Signal Sensor (Bank 1 Sensor 2)

12

OG/BK

380

A/C Refrigerant Pressure Sensor Signal

13

TN

5514

Low Reference

14-15

--

--

Not Used

16

PU

1589

Fuel Level Sensor Signal

17

D-BU

473

High Speed Cooling Fan Relay Control

18

BN

4

Accessory Voltage

19

PK

439

Ignition 1 Voltage

20

RD/WH

1540

Battery Positive Voltage

21-22

--

--

Not Used

23

PU

1272

Low Reference 2

24

D-GN

890

Fuel Tank Pressure Sensor Signal

25-26

--

--

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

Pedal Position Signal 1

30

BN

1271

Low Reference 1

31

TN

2759

Low Reference

32

L-BU

1162

Pedal Position Signal 2

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

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

Main 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 [- Bank 1 Sensor 2]

66-67

--

--

Not Used

68

BN/WH

419

MIL Control

69-72

--

--

Not Used

73

BK/WH

451

Ground

Electronic Control Module (ECM) - C2


Object Number: 1830236  Size: CH

Connector Part Information

  • OEM: 34566-0803
  • Service: 19115670
  • Description: 80-Way F Receptacle 0.64 2.8 Sealed (GY)

Terminal Part Information

  • Pins: 2, 3, 8, 12, 15, 17, 18, 19, 20, 21, 26, 27, 28, 29, 30, 31, 32, 35, 37, 40, 42, 43, 44, 46, 53, 54, 55, 56, 57, 58, 61, 63, 64, 65, 66, 68, 69, 70, 71, 72, 78, 80, 5, 6
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: Pins 2, 3, 8, 12, 15, 17, 18, 19, 20, 21, 26, 27, 28, 29, 30, 31, 32, 35, 37, 40, 42, 43, 44, 46, 53, 54, 55, 56, 57, 58, 61, 63, 64, 65, 66, 68, 69, 70, 71, 72, 78, 80 - J/J
  • Core/Insulation Crimp: Pins 5, 6 - K/K
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

Electronic Control Module (ECM) - C2

Pin

Wire Color

Circuit No.

Function

1

--

--

Not Used

2

PU/WH

6270

5-Volt Reference 2

3

GY

2701

5-Volt Reference 2

4

--

--

Not Used

5

BN

582

TAC Motor Control - 2

6

YE

581

TAC Motor Control - 1

7

--

--

Not Used

8

D-GN/WH

428

EVAP Canister Purge Solenoid Control

9-11

--

--

Not Used

12

GY/WH

3113

HO2S Heater Low Control [- Bank 1 Sensor 1]

13-14

--

--

Not Used

15

OG

1676

EGR Solenoid High Control

16

--

--

Not Used

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

22-25

--

--

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

33-34

--

--

Not Used

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

--

--

Not Used

42

GY

5047

5-Volt Reference 1

43

GY

2704

5-Volt Reference 1

44

D-BU

6259

5-Volt Reference

45

--

--

Not Used

46

GY

435

EGR Solenoid Low Control or EGR Solenoid Control

47-52

--

--

Not Used

53

OG/BK

469

Low Reference

54

TN

2753

Low Reference

55

BN

1456

EGR Valve Position Signal

56

TN/WH

1653

HO2S Low Signal [- Bank 1 Sensor 1]

57

PU/WH

1665

HO2S High Signal [- Bank 1 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

Throttle Position Signal 2

64

BN/WH

633

CMP Sensor Signal

65

D-GN

485

Throttle Position Signal 1

66

TN

407

Low Reference

67

--

--

Not Used

68

WH/BK

6271

Medium Resolution Engine Speed 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

--

--

Not Used

80

TN/BK

231

Oil Pressure Switch Signal