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

Powertrain Control Module (PCM) C1


Object Number: 655733  Size: CH

Connector Part Information

    • 12191489
    • 80-Way F Micro-Pack 100W Sealed (BU)

Pin

Wire Color

Circuit No.

Function

1

BK

750

Ground

2

L-GN

1867

12-Volt Reference

3

PK/BK

1746

Fuel Injector 3 Control

4

L-GN/BK

1745

Fuel Injector 2 Control

5-6

--

--

Not Used

7

GY

2705

5-Volt Reference A

8-10

--

--

Not Used

11

L-BU

1876

Knock Sensor 2 Signal

12

D-BU/WH

1869

CKP Sensor Signal

13

OG/BK

463

Requested Torque Signal

14

TN

800

UART Serial Data

15

D-BU/WH

774

UART Serial Data

16-18

--

--

Not Used

19

PK

239

Ignition 1 Voltage

20

RD/WH

1440

Battery Positive Voltage

21

YE/BK

1868

Low Reference

22

--

--

Not Used

23

TN

452

Low Reference

24

BK/WH

1451

Ground

25

TN

1671

HO2S Low Signal - Bank 2 Sensor 2

26

TN

1667

HO2S Low Signal - Bank 2 Sensor 1

27

BK/WH

1551

Ground

28

TN/WH

1669

HO2S Low Signal - Bank 1 Sensor 2

29

TN

1664

HO2S Low Signal - Bank 1 Sensor 1

30-34

--

--

Not Used

35

BN/WH

379

CPP Switch Signal

36

TN

1744

Fuel Injector 1 Control

37

YE/BK

846

Fuel Injector 6 Control

38

--

--

Not Used

39

YE

447

Starter Relay Coil Control

40

BK

750

Ground

41

--

--

Not Used

42

D-GN

335

Low Speed Cooling Fan Relay Control

43

OG/BK

877

Fuel Injector 7 Control

44

L-BU/BK

844

Fuel Injector 4 Control

45

GY

2700

5-Volt Reference B

46

GY

596

5-Volt Reference B

47

--

--

Not Used

48

GY

2704

5-Volt Reference A

49-50

--

--

Not Used

51

D-BU

496

Knock Sensor 1 Signal

52

--

--

Not Used

53

OG/BK

1057

Low Reference

54

OG/BK

469

Low Reference

55-56

--

--

Not Used

57

RD/WH

1440

Battery Positive Voltage

58

PU

1807

Class 2 Serial Data

59

PU

1807

Class 2 Serial Data

60

--

--

Not Used

61

PK/BK

632

Low Reference

62

GY

847

Extended Travel Brake Switch Signal

63

BK

2755

Low Reference

64

BK/WH

1451

Ground

65

PU

1670

HO2S High Signal - Bank 2 Sensor 2

66

PU

1666

HO2S High Signal - Bank 2 Sensor 1

67

BK/WH

1551

Ground

68

PU/WH

1668

HO2S High Signal - Bank 1 Sensor 2

69

PU/WH

1665

HO2S High Signal - Bank 1 Sensor 1

70

BN

1174

Oil Level Switch Signal

71-72

--

--

Not Used

73

BN/WH

633

CMP Sensor Signal

74

YE

410

ECT Sensor Signal

75

--

--

Not Used

76

TN/WH

845

Fuel Injector 5 Control

77

D-BU/WH

878

Fuel Injector 8 Control

78

--

--

Not Used

79

GY

587

Skip/Shift Solenoid Control

80

TN

2761

Low Reference

Powertrain Control Module (PCM) C2


Object Number: 684875  Size: CH

Connector Part Information

    • 12191488
    • 80-Way F Micro-Pack 100W Sealed (GN)

Pin

Wire Color

Circuit No.

Function

1

BK

750

Ground

2-4

--

--

Not Used

5

TN/BK

464

Delivered Torque Signal

6-8

--

--

Not Used

9

D-GN/WH

465

Fuel Pump Relay Control

10

WH

121

Engine Speed Signal

11-13

--

--

Not Used

14

OG/BK

380

A/C Refrigerant Pressure Sensor Signal

15

OG

225

Generator Turn On Signal

16-17

--

--

Not Used

18

PU/WH

1035

Starter Relay Coil Supply Voltage

19

--

--

Not Used

20

L-GN/BK

822

VSS Low Signal

21

PU/WH

821

VSS High Signal

22-24

--

--

Not Used

25

TN

472

IAT Sensor Signal

26

PU

2121

IC 1 Control

27

OG

2127

IC 7 Control

28

L-BU/WH

2126

IC 6 Control

29

D-GN/WH

2124

IC 4 Control

30

--

--

Not Used

31

YE

492

MAF Sensor Signal

32

L-GN

432

MAP Sensor Signal

33

D-BU

473

High Speed Cooling Fan Relay Control

34

D-GN/WH

428

EVAP Canister Purge Solenoid Control

35-38

--

--

Not Used

39

OG

631

12-Volt Reference

40

BK

750

Ground

41-42

--

--

Not Used

43

D-GN/WH

459

A/C Compressor Clutch Relay Control

44

L-GN

1652

Reverse Lockout Solenoid Control

45

WH

1310

EVAP Canister Vent Solenoid Control

46

BN/WH

419

MIL Control

47

WH

375

Skip Shift Indicator Control

48-49

--

--

Not Used

50

BN

818

Vehicle Speed Signal

51

YE/BK

1227

TFT Sensor Signal

52

BN

2391

HO2S Heater Low Control - Bank 1 Sensor 2

53

OG/WH

3223

HO2S Heater Low Control - Bank 2 Sensor 2

54

D-BU

1936

Fuel Level Sensor Signal - Primary

55-56

--

--

Not Used

57

TN

552

Low Reference

58

TN/WH

331

Oil Pressure Sensor Signal

59

YE

5

Crank Voltage

60

BN

2129

Low Reference

61

BN/WH

2130

Low Reference

62-63

--

--

Not Used

64

D-GN

890

Fuel Tank Pressure Sensor Signal

65

BN

5069

MAIN Relay Control

66

PU/WH

2128

IC 8 Control

67

OG/WH

2122

IC 2 Control

68

D-GN

2125

IC 5 Control

69

L-BU

2123

IC 3 Control

70-71

--

--

Not Used

72

GY/WH

3113

HO2S Heater Low Control - Bank 1 Sensor 1

73

L-BU

1937

Fuel Level Sensor Signal - Secondary

74

L-GN

3212

HO2S Heater Low Control - Bank 2 Sensor 1

75

GY

23

Generator Field Duty Cycle Signal

76-79

--

--

Not Used

80

TN

5514

Low Reference