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: 1228485  Size: CH

Connector Part Information

  • OEM: 15452125
  • Service: 88953346
  • Description: 56-Way F Micro 64 Series Sealed (BU)

Terminal Part Information

  • Terminal/Tray: See Terminal Repair Kit
  • Core/Insulation Crimp: See Terminal Repair Kit
  • Release Tool/Test Probe: See Terminal Repair Kit

Engine Control Module (ECM) C1

Pin

Wire Color

Circuit No.

Function

1

PU

1589

Fuel Level Sensor Signal

2

L-BU

1162

AAP Sensor 2 Signal

3

D-GN

890

Fuel Tank Pressure Sensor Signal

4

D-BU

1161

AAP Sensor 1 Signal

5

--

--

Not Used

6

D-GN

1433

PNP/Clutch Start Switch Signal

7

--

--

Not Used

8

BN/WH

379

CCP Switch Signal

9

PU

420

TCC Brake Switch/Cruise Control Release Signal

10

WH/BK

1164

5-Volt Reference-1

11

L-BU

20

Stop Lamp Switch Signal

12

BN

4

Accessory Voltage

13

GY

2709

5-Volt Reference-1

14

D-GN/WH

465

Fuel Pump Relay Control

15-17

--

--

Not Used

18

BN

5069

Main Relay Control

19-27

--

--

Not Used

28

PK/BK

1039

Ignition 1 Voltage

29

PU

421

AIR Solenoid Control (NU3)

30

WH

1310

EVAP Canister Vent Solenoid Control

31

D-GN/WH

459

A/C Compressor Clutch Relay Control

32-40

--

--

Not Used

41

TN

1274

5-Volt Reference-2

42

--

--

Not Used

43

D-BU

473

High Speed Cooling Fan Relay Control

44

--

--

Not Used

45

BN/WH

419

MIL Control

46

YE

447

Starter Relay Coil Control

47-51

--

--

Not Used

52

RD/WH

840

Battery Positive Voltage

53

BN

1271

Low Reference

54

TN

2759

Low Reference

55

--

--

Not Used

56

PU

1272

Low Reference

Engine Control Module (ECM) C2


Object Number: 1332467  Size: CH

Connector Part Information

  • OEM: 15452126
  • Service: 88953274
  • Description: 73-Way F GT 280 Series Micro 64 Sealed (BK)

Terminal Part Information

  • Terminal/Tray: See Terminal Repair Kit
  • Core/Insulation Crimp: See Terminal Repair Kit
  • Release Tool/Test Probe: See Terminal Repair Kit

Engine Control Module (ECM) C2

Pin

Wire Color

Circuit No.

Function

1-2

--

--

Not Used

3

YE

581

TAC Motor Control 1

4

--

--

Not Used

5

BN

582

TAC Motor Control 2

6-9

--

--

Not Used

10

TN

1744

Fuel Injector (1) Control

11

PK/BK

1746

Fuel Injector (3) Control

12

L-BU/BK

844

Fuel Injector (4) Control

13

L-GN/BK

1745

Fuel Injector (2) Control

14

BN

436

AIR Pump Relay Control (NU3)

15

D-GN/WH

428

EVAP Canister Purge Solenoid Control

16

--

--

Not Used

17

GY/WH

1423

HO2S Heater Low Control Sensor 2

18

YE

400

VSS High Signal

19

PU

401

VSS Low Signal

20-23

--

--

Not Used

24

GY

2701

5-Volt Reference-1

25

GY/BK

2704

5-Volt Reference-2

26

L-BU/BK

1688

5-Volt Reference-2

27

GY

474

5-Volt Reference (NU3)

28

GY

2700

5-Volt Reference-1 (C67)

29

TN/WH

1704

Low Reference

30

WH

5268

AIR Solenoid Position Signal (NU3)

31

TN

2752

Low Reference

32-33

--

--

Not Used

34

PK

5293

Engine Main Relay Fused Control (4)

36

PU

486

TP Sensor 2 Signal

37

--

--

Not Used

38

TN

2760

Low Reference

39

--

--

Not Used

40

OG/BK

469

Low Reference

41

PU/WH

3110

HO2S High Signal Sensor 1

42

TN/WH

3111

HO2S Low Signal Sensor 1

43

PU/WH

1668

HO2S High Signal Sensor 2

44

TN/WH

1669

HO2S Low Signal Sensor 2

45-46

--

--

Not Used

47

D-GN

335

Low Speed Cooling Fan Relay Control

48

TN/BK

231

Oil Pressure Switch Signal

49

OG/BK

380

A/C Refrigerant Pressure Sensor Signal (C67)

50

YE

410

ECT Sensor Signal

51

GY/WH

23

Generator Field Duty Cycle Signal

52

YE

492

MAF Sensor Signal

53

GY/WH

3113

HO2S Heater Low Control Sensor 1

54

WH

423

IC Timing Control 1

55

OG

406

IC Timing Control 2

56-57

--

--

Not Used

58

D-GN

485

TP Sensor 1 Signal

59

BK/WH

2751

Low Reference

60

BK

407

Low Reference (NU3)

61

TN

2761

Low Reference

62

L-GN

432

MAP Sensor Signal

63

OG

225

Generator Turn On Signal

64

TN/BK

2500

High Speed GMLAN Serial Data (+)

65

TN

2501

High Speed GMLAN Serial Data (-)

66

YE

573

CKP Sensor Signal

67

PU

574

Low Reference

68

TN

472

IAT Sensor Signal

69

--

--

Not Used

70

BN/WH

633

CMP Sensor Signal

71

GY

1716

Low Reference

72

D-BU

496

Knock Sensor Signal

73

BK/WH

451

Ground