GM Service Manual Online
For 1990-2009 cars only
Table 1: Powertrain Control Module (PCM) C1
Table 2: Powertrain Control Module (PCM) C2
Table 3: Powertrain Control Module (PCM) C3 (MU3)

Powertrain Control Module (PCM) C1


Object Number: 1228485  Size: CH

Connector Part Information

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

Pin

Wire Color

Circuit No.

Function

1

TN/BK

2500

High Speed GMLAN Serial Data (+) (1)

2

TN

2501

High Speed GMLAN Serial Data (-) (1)

3-5

--

--

Not Used

6

D-GN/WH

459

A/C Compressor Clutch Relay Control

7

BN

1271

Accelerator Pedal Position Low Reference (1)

8

PU

1272

Accelerator Pedal Position Low Reference (2)

9

--

--

Not Used

10

D-BU

473

High Speed Cooling Fan Relay Control

11

--

--

Not Used

12

PU

1589

Primary Fuel Level Sensor Signal

13

PK/BK

5293

Engine Main Relay Fused Control (4)

14

L-BU

6118

Manifold Air Temperature Sensor Signal

15

--

--

Not Used

16

D-GN

1049

ECM/PCM/VCM Class 2 Serial Data

17

GY

2700

A/C Pressure Sensor 5-Volt Reference

18

BN

4

Accessory Voltage

19

PK/BK

1039

Run/Crank Ignition 1 Voltage

20

RD/WH

840

Battery Positive Voltage

21

--

--

Not Used

22

WH

1310

EVAP Canister Vent Solenoid Control

23

--

--

Not Used

24

D-GN

890

Fuel Tank Pressure Sensor Signal

25

--

--

Not Used

26

OG/BK

380

A/C Refrigerant Pressure Sensor Signal

27

D-BU

1161

Accelerator Pedal Position Signal (1)

28

--

--

Not Used

29

TN

2759

Fuel Tank Pressure Sensor Low Reference

30

WH/BK

1164

Accelerator Pedal Position 5-Volt Reference (1)

31

--

--

Not Used

32

L-BU

20

Stop Lamp Supply Voltage

33

--

--

Not Used

34

PK

2014

Coolant Pump Relay Coil Control

35-36

--

--

Not Used

37

D-GN/WH

465

Fuel Pump Primary Relay Control

38

BN

5069

Engine Main Relay Coil Control

39

--

--

Not Used

40

BN/WH

419

Check Engine Indicator Control

41

L-BU

1162

Accelerator Pedal Position Signal (2)

42

--

--

Not Used

43

TN

1274

Accelerator Pedal Position 5-Volt Reference (2)

44-45

--

--

Not Used

46

PU

420

Torque Converter Clutch Brake Switch Signal

47

GY

2709

Fuel Tank Pressure Sensor 5-Volt Reference

48

YE

447

Starter Relay Coil Control

49-50

--

--

Not Used

51

D-GN

335

Low Speed Cooling Fan Relay Control

52

--

--

Not Used

53

BN/WH

379

Cruise Control Clutch Pedal Position Switch Signal

54

D-GN

1433

Clutch Start Switch Signal

55

--

--

Not Used

56

BK/WH

2751

Signal Ground

Powertrain Control Module (PCM) C2


Object Number: 1332467  Size: CH

Connector Part Information

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

Pin

Wire Color

Circuit No.

Function

1

RD

225

Generator Turn On Signal

2

D-GN

485

Throttle Position Sensor Signal (1)

3

--

--

Not Used

4

GY

596

5-Volt Reference

5

GY

2704

Manifold Absolute Pressure Sensor 5-Volt Reference

6

GY

2701

Throttle Position Sensor 5-Volt Reference

7

PU

486

Throttle Position Sensor Signal (2)

8

D-GN

6291

Manifold Absolute Pressure Sensor #2-Volt Reference

9

L-BU/BK

1688

5-Volt Reference

10-15

--

--

Not Used

16

PU

6413

EST Return Low Reference

17

YE

573

Crankshaft Position Sensor Signal (1)

18

PU

574

Crankshaft Position Sensor Low Reference (1)

19

--

--

Not Used

20

D-GN/WH

6292

Manifold Absolute Pressure #2 Low Reference

21

PK/BK

632

Camshaft Position Sensor Low Reference

22-24

--

--

Not Used

25

TN/WH

1669

Heated Oxygen Sensor Low Signal Bank 1 Sensor (2)

26

BN/WH

633

Camshaft Position Sensor Signal

27-28

--

--

Not Used

29

GY

1724

Supercharger Boost Solenoid Control

30

OG/BK

469

Manifold Absolute Pressure Sensor Low Reference

31

--

--

Not Used

32

TN

1667

Heated Oxygen Sensor Low Signal Bank 2 Sensor (1)

33

BK

1744

Fuel Injector Control (1)

34

--

--

Not Used

35

YE

410

Engine Coolant Temperature Sensor Signal

36

BK/WH

1704

Sensor Low Reference

37

GY

6337

Manifold Absolute Pressure Sensor #2 Signal

38

L-GN

432

Manifold Absolute Pressure Sensor Signal

39

BK

2752

Throttle Position Sensor Low Reference

40

BN/WH

6405

EST A Control

41

YE

492

Mass Air Flow Sensor Signal

42

D-GN/WH

6407

EST C Control

43

BK/WH

1423

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

44

--

--

Not Used

45

GY

23

Generator Field Duty Cycle Signal

46

PU/WH

1668

Heated Oxygen Sensor High Signal Bank 1 Sensor (2)

47

--

--

Not Used

48

PU

1666

Heated Oxygen Sensor High Signal Bank 2 Sensor (1)

49-50

--

--

Not Used

51

TN

472

Intake Air Temperature Sensor Signal

52

BK

2761

Coolant Temperature Sensor Low Reference

53

L-GN/BK

1745

Fuel Injector Control (2)

54

L-BU/BK

844

Fuel Injector Control (4)

55

PK/BK

1746

Fuel Injector Control (3)

56-57

--

--

Not Used

58

D-GN

676

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

59

D-BU/WH

6406

EST B Control

60

L-BU/WH

6408

EST D Control

61-63

--

--

Not Used

64

BK

2760

Intake Air Temperature Sensor Low Reference

65

BN

582

Throttle Actuator Control Close

66

YE

581

Throttle Actuator Control Open

67

--

--

Not Used

68

D-BU

496

Knock Sensor Signal (1)

69

GY

1716

Knock Sensor Low Reference (1)

70-72

--

--

Not Used

73

BK/WH

451

Signal Ground

Powertrain Control Module (PCM) C3 (MU3)


Object Number: 1283894  Size: CH

Connector Part Information

    • OEM: 15437820
    • Service: See Catalog
    •  56-Way F Micro 64 Sealed (GY)

Pin

Wire Color

Circuit No.

Function

1-9

--

--

Not Used

10

TN

891

Boost Gage Signal

11-14

--

--

Not Used

15

TN/BK

231

Oil Pressure Switch Signal

16-21

--

--

Not Used

22

WH/BK

2932

5-Volt Reference

23-30

--

--

Not Used

31

GY/BK

433

BARO Sensor Signal

32-35

--

--

Not Used

36

OG/BK

6014

Low Reference

37

D-GN/WH

428

EVAP Canister Purge Solenoid Control

38-43

--

--

Not Used

44

PU

401

VSS Low Signal

45

YE

400

VSS High Signal

46-56

--

--

Not Used