GM Service Manual Online
For 1990-2009 cars only
Connector 1: Engine Control Module (ECM) C1
Connector 2: Engine Control Module (ECM) C2
Connector 3: Engine Control Module (ECM) C3

Engine Control Module (ECM) C1


Object Number: 1228485  Size: CH

Connector Part Information

  • OEM: 13510514
  • Service: 88988683
  • Description: 56-Way F Micro-Pack 64 Series Sealed (BU)

Terminal Part Information

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

Engine Control Module (ECM) C1

Pin

Wire Color

Circuit No.

Function

1-6

--

--

Not Available

7

WH

17

Stop Lamp Supply Voltage

8

--

--

Not Available

9

OG/BK

1057

Low Reference

10-11

--

--

Not Available

12

BN/WH

419

MIL Control

13

D-GN/WH

465

Fuel Pump Relay Control

14-17

--

--

Not Available

18

BN

4

Accessory Voltage

19

PK

639

Ignition 1 Voltage

20

RD/WH

540

Battery Positive Voltage

21-25

--

--

Not Available

26

PU/WH

6386

Starter Relay Coil Control

27-32

--

--

Not Available

33

WH/BK

1164

5-Volt Reference 2

34

GY

705

5-Volt Reference 1

35

TN

1274

5-Volt Reference 1

36

BN

1271

Low Reference

37

PU

1272

Low Reference

38

--

--

Not Available

39

BN

818

Vehicle Speed Signal

40

BN

5069

Powertrain Relay Control

41-43

--

--

Not Available

44

PU

1589

Fuel Level Sensor Signal

45-46

--

--

Not Available

47

D-BU

1161

APP Sensor 1 Signal

48

D-GN

890

Fuel Tank Pressure Sensor Signal

49

L-BU

1162

APP Sensor 2 Signal

50-52

--

--

Not Available

53

D-GN/WH

459

A/C Compressor Clutch Relay Control

54

D-BU

473

High Speed Cooling Fan Relay Control

55

WH

1310

EVAP Canister Vent Solenoid Control

56

--

--

Not Available

Engine Control Module (ECM) C2


Object Number: 1335545  Size: CH

Connector Part Information

  • OEM: 15492355
  • Service: 88988612
  • Description: 73-Way F Micro-Pack 64 Series Sealed (BK)

Terminal Part Information

  • Pins: 1, 10, 14, 17, 23-24, 26-27, 29, 33, 35, 39-40, 43-46, 59-60, 63-64, 66, 68-69
  • Terminal/Tray: 33467-0003/23
  • Core/Insulation Crimp: H/H
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 2-5, 6-9, 11-13, 32, 42, 48-49, 52, 62, 67, 71-72
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: Pins 2-5, 11-13 - K/K
  • Core/Insulation Crimp: Pins 6-9, 32, 42, 48-49, 52, 62, 67, 71-72 - 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-35616-35 (VT)

Engine Control Module (ECM) C2

Pin

Wire Color

Circuit No.

Function

1

PU

2121

IC 1 Control

2

TN/WH

3111

HO2S Low Signal (Bank 1 Sensor 1)

3

PU/WH

3110

HO2S High Signal (Bank 1 Sensor 1)

4

PU

3120

HO2S Low Signal (Bank 2 Sensor 1)

5

TN/WH

3121

HO2S Low Signal (Bank 1 Sensor 2)

6

L-BU

1876

Knock Sensor 2 Signal

7

GY

2303

Low Reference

8

D-BU

496

Knock Sensor 1 Signal

9

GY

1716

Low Reference

10

GY/BK

1798

Drain Wire

11

YE

581

TAC Motor Control 1

12

BN

582

TAC Motor Control 2

13

PK/BK

5290

Ignition 1 Voltage

14

BN

2198

Camshaft Position Actuator Solenoid High Control

15-16

--

--

Not Used

17

OG/WH

2122

IC 2 Control

18-22

--

--

Not Used

23

PK/BK

632

Low Reference

24

BK

2755

Low Reference

25

--

--

Not Used

26

OG/BK

645

Low Reference

27

PU

574

Low Reference

28

--

--

Not Used

29

TN

2752

Low Reference

30-31

--

--

Not Used

32

L-BU/BK

844

Fuel Injector 4 Control

33

L-BU

2123

IC 3 Control

34

--

--

Not Used

35

YE

2174

Low Reference

36-38

--

--

Not Used

39

OG/WH

815

5-Volt Reference

40

GY

2705

5-Volt Reference

41

--

--

Not Used

42

TN/BK

2760

Low Reference

43

L-GN

1867

12-Volt Reference

44

GY

2701

5-Volt Reference 2

45

OG/BK

1175

Low Reference

46

TN

2199

Low Reference

47

--

--

Not Used

48

L-GN/BK

1745

Fuel Injector 2 Control

49

YE/BK

846

Fuel Injector 6 Control

50-51

--

--

Not Used

52

TN/WH

845

Fuel Injector 5 Control

53-58

--

--

Not Used

59

BN/WH

633

CMP Sensor Signal

60

TN/WH

331

Oil Pressure Sensor Signal

61

--

--

Not Used

62

TN

472

IAT Sensor Signal

63

L-BU/BK

647

Medium Resolution Engine Speed Signal

64

D-GN

485

TP Sensor 1 Signal

65

--

--

Not Used

66

PU

486

TP Sensor 2 Signal

67

YE

492

MAF Sensor Signal

68

GY/WH

3113

HO2S Heater Low Control (Bank 1 Sensor 1)

69

GY/WH

3122

HO2S Heater Low Control (Bank 1 Sensor 2)

70

--

--

Not Used

71

PK/BK

1746

Fuel Injector 3 Control

72

TN

1744

Fuel Injector 1 Control

73

BK/WH

451

Ground

Engine Control Module (ECM) C3


Object Number: 1335545  Size: CH

Connector Part Information

  • OEM: 15492353
  • Service: 88988611
  • Description: 73-Way F Micro-Pack 64 Series Sealed (D-GY)

Terminal Part Information

  • Pins: 3-6
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: K/K
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 7, 15, 18, 21, 23-24, 29, 32-33, 35, 37, 39, 46, 48-50, 53, 55, 57, 59, 64
  • 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) C3

Pin

Wire Color

Circuit No.

Function

1-2

--

--

Not Used

3

TN/WH

3211

HO2S Low Reference (Bank 2 Sensor 1)

4

PU/WH

3210

HO2S Reference Voltage (Bank 2 Sensor 1)

5

PU

3220

HO2S High Signal (Bank 2 Sensor 2)

6

TN

3221

HO2S Low Signal (Bank 2 Sensor 2)

7

OG

225

Generator Turn On Signal

8-14

--

--

Not Used

15

L-GN

3212

HO2S Heater Low Signal (Bank 2 Sensor 1)

16-17

--

--

Not Used

18

BN

1174

Oil Level Switch Signal

19-20

--

--

Not Used

21

TN

5514

Low Reference

22

--

--

Not Used

23

OG/BK

469

Low Reference

24

OG/BK

1057

Low Reference

25-28

--

--

Not Used

29

GY

23

Generator Field Duty Cycle Signal

30-31

--

--

Not Used

32

OG

6392

Variable Tuning Signal

33

TN

2501

High Speed GMLAN Serial Data Bus -

34

--

--

Not Used

35

TN

2761

Low Reference

36

--

--

Not Used

37

GY

2700

5-Volt Reference 2

38

--

--

Not Used

39

GY

2704

5-Volt Reference 1

40-45

--

--

Not Used

46

OG/BK

1786

Park/Neutral Signal

47

--

--

Not Used

48

D-GN/WH

428

EVAP Canister Purge Solenoid Control

49

D-GN

335

Low Speed Cooling Fan Relay Control

50

OG/WH

3223

HO2S Heater Low Control (Bank 2 Sensor 2)

51-52

--

--

Not Used

53

TN/BK

2500

High Speed GMLAN Serial Data Bus +

54

--

--

Not Used

55

YE

410

ECT Sensor Signal

56

--

--

Not Used

57

OG/BK

380

A/C Refrigerant Pressure Sensor Signal

58

--

--

Not Used

59

L-GN

432

MAP Sensor Signal

60-63

--

--

Not Used

64

YE/BK

6806

IMT Fan Position Signal

65-73

--

--

Not Used