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

Engine Control Module (ECM) C1


Object Number: 1228485  Size: CH

Connector Part Information

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

Pin

Wire Color

Circuit No.

Function

1

PU

1589

Primary Fuel Level Sensor Signal

2

L-BU

1162

Accelerator Pedal Position Signal (2)

3

D-GN

890

Fuel Tank Pressure Sensor Signal

4

D-BU

1161

Accelerator Pedal Position Signal (1)

5

--

--

Not Used

6

D-GN

1433

Clutch Start Switch Signal

7

--

--

Not Used

8

BN/WH

379

Cruise Control Clutch Pedal Position Switch Signal

9

PU

420

Torque Converter Clutch Brake Switch Signal

10

WH/BK

1164

Accelerator Pedal Position 5-Volt Reference (1)

11

L-BU

20

Stop Lamp Supply Voltage

12

BN

4

Accessory Voltage

13

GY

2709

Fuel Tank Pressure Sensor 5-Volt Reference

14

D-GN/WH

465

Fuel Pump Primary Relay Control

15-17

--

--

Not Used

18

BN

5069

Engine Main Relay Coil Control

19-27

--

--

Not Used

28

PK/BK

1039

Run/Crank Ignition 1 Voltage

29

PU

421

Air Injection Reaction Solenoid Relay Coil Control

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

Accelerator Pedal Position Low Reference (2)

42

--

--

Not Used

43

D-BU

473

High Speed Cooling Fan Relay Control

44

--

--

Not Used

45

BN/WH

419

Check Engine Indicator Control

46

YE

447

Starter Relay Coil Control

47-51

--

--

Not Used

52

RD/WH

840

Battery Positive Voltage

53

BN

1271

Accelerator Pedal Position Low Reference (1)

54

TN

2759

Fuel Tank Pressure Sensor Low Reference

55

--

--

Not Used

56

PU

1272

Accelerator Pedal Position 5-Volt Reference (2)

Engine Control Module (ECM) C2


Object Number: 1332467  Size: CH

Connector Part Information

    • OEM: 15452126
    • Service: See Catalog
    •  73-Way F GT 280 Series Micro 64 Sealed

Pin

Wire Color

Circuit No.

Function

1-2

--

--

Not Used

3

YE

581

Throttle Actuator Control Open

4

--

--

Not Used

5

BN

582

Throttle Actuator Control Close

6-9

--

--

Not Used

10

TN

1744

Fuel Injector Control (1)

11

PK/BK

1746

Fuel Injector Control (3)

12

L-BU/BK

844

Fuel Injector Control (4)

13

L-GN/BK

1745

Fuel Injector Control (2)

14

--

--

Not Used

15

D-GN/WH

428

EVAP Canister Purge Solenoid Control

16

--

--

Not Used

17

GY/WH

1423

Heated Oxygen Sensor Heater Low Control Bank 1 Sensor (2)

18

YE

400

Vehicle Speed Sensor Signal

19

PU

401

Vehicle Speed Sensor Low Reference

20-23

--

--

Not Used

24

GY

2701

Throttle Position Sensor 5-Volt Reference

25

GY/BK

2704

Manifold Absolute Pressure Sensor 5-Volt Reference

26

L-BU/BK

1688

5-Volt Reference

27

--

--

Not Used

28

GY

2700

A/C Pressure Sensor 5-Volt Reference (C67)

29

TN/WH

1704

Sensor Low Reference

30

--

--

Not Used

31

TN

2752

Throttle Position Sensor Low Reference

32-33

--

--

Not Used

34

PK

5293

Engine Main Relay Fused Control (4)

36

PU

486

Throttle Position Sensor Signal (2)

37

--

--

Not Used

38

TN

2760

Intake Air Temperature Sensor Low Reference

39

--

--

Not Used

40

OG/BK

469

Manifold Absolute Pressure Sensor Low Reference

41

PU/WH

3110

Heated Oxygen Sensor High Signal Bank 1 Sensor (1)

42

TN/WH

3111

Heated Oxygen Sensor Low Signal Bank 1 Sensor (1)

43

PU/WH

1668

Heated Oxygen Sensor High Signal Bank 1 Sensor (2)

44

TN/WH

1669

Heated Oxygen Sensor Low Signal Bank 1 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

Engine Coolant Temperature Sensor Signal

51

GY/WH

23

Generator Field Duty Cycle Signal

52

YE

492

Mass Air Flow Sensor Signal

53

GY/WH

3113

Heated Oxygen Sensor Heater Low Control Bank 1 Sensor (1)

54

WH

423

Ignition Control Timing Control (1)

55

OG

406

Ignition Control Timing Control (2)

56-57

--

--

Not Used

58

D-GN

485

Throttle Position Sensor Signal (1)

59

BK/WH

2751

Signal Ground

60

--

--

Not Used

61

TN

2761

Coolant Temperature Sensor Low Reference

62

L-GN

432

Manifold Absolute Pressure Sensor Signal

63

OG

225

Generator Turn On Signal

64

TN/BK

2500

High Speed GMLAN Serial Data (+) (1)

65

TN

2501

High Speed GMLAN Serial Data (-) (1)

66

YE

573

Crankshaft Position Sensor Signal (1)

67

PU

574

Crankshaft Position Sensor Low Reference (1)

68

TN

472

Intake Air Temperature Sensor Signal

69

--

--

Not Used

70

BN/WH

633

Camshaft Position Sensor Signal

71

GY

1716

Knock Sensor Low Reference (1)

72

D-BU

496

Knock Sensor Signal (1)

73

BK/WH

451

Signal Ground