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 (BLU)

Pin

Wire Color

Circuit No.

Function

1

BLK/WHT

451

Ground

2

LT GRN

1867

12 Volt Reference

3

PNK/BLK

1746

Fuel Injector 3 Control

4

LT GRN/

BLK

1745

Fuel Injector 2 Control

5-6

--

--

Not Used

7

GRY

2705

5 Volt Reference

8-10

--

--

Not Used

11

LT BLU

1876

Knock Sensor 2 Signal

12

DK BLU/

WHT

1869

CKP Sensor Signal

13

--

--

Not Used

14

ORN/BLK

1061

UART Serial Data-Secondary

15

DK BLU/

WHT

774

UART Serial Data-Tertiary

16

--

--

Not Used

17

DK BLU

1225

Transmission Fluid Pressure Switch Signal B

18

RED

1226

Transmission Fluid Pressure Switch Signal C

19

PNK

439

Ignition 1 Voltage

20

ORN

440

Battery Positive Voltage

21

YEL/BLK

1868

Low Reference

22

--

--

Not Used

23

BLK

470

Low Reference

24

BLK/WHT

451

Ground

25

TAN

1671

HO2S Low Signal - Bank 2 Sensor 2

26

TAN

1667

HO2S Low Signal - Bank 2 Sensor 1

27

BLK/WHT

451

Ground

28

TAN/WHT

1669

HO2S Low Signal - Bank 1 Sensor 2

29

TAN

1664

HO2S Low Signal - Bank 1 Sensor 1

30

LT GRN

1478

Coolant Level Switch Signal

31

--

--

Not Used

32

BLK/WHT

771

Transmission Range Switch Signal A

33

PPL

420

TCC Brake Switch/Cruise Control Release Signal

34

WHT

776

Transmission Range Switch Signal P

35

--

--

Not Used

36

BLK

1744

Fuel Injector 1 Control

37

YEL/BLK

846

Fuel Injector 6 Control

38

--

--

Not Used

39

YEL/BLK

625

Starter Enable Relay Control

40

BLK/WHT

451

Ground

41-42

--

--

Not Used

43

RED/BLK

877

Fuel Injector 7 Control

44

LT BLU/BLK

844

Fuel Injector 4 Control

45

GRY

2700

5 Volt Reference

46

GRY

474

5 Volt Reference

47

--

--

Not Used

48

GRY

597

5 Volt Reference

49-50

--

--

Not Used

51

DK BLU

496

Knock Sensor 1 Signal

52

--

--

Not Used

53

BLK

407

Low Reference

54

ORN/BLK

469

Low Reference

55-56

--

--

Not Used

57

ORN

440

Battery Positive Voltage

58

DK GRN

1049

PCM Class 2 Serial Data

59

YEL

710

PCM Class 2 Serial Data

60

--

--

Not Used

61

PNK/BLK

632

Low Reference

62

--

--

Not Used

63

BLK

2755

Low Reference

64

BLK/WHT

451

Ground

65

PPL

1670

HO2S High Signal - Bank 2 Sensor 2

66

PPL

1666

HO2S High Signal - Bank 2 Sensor 1

67

BLK/WHT

451

Ground

68

PPL/WHT

1668

HO2S High Signal - Bank 1 Sensor 2

69

PPL/WHT

1665

HO2S High Signal - Bank 1 Sensor 1

70

BRN

1174

Oil Level Switch Signal

71

--

--

Not Used

72

YEL

772

Transmission Range Switch Signal B

73

BRN/WHT

633

CMP Sensor Signal

74

YEL

410

ECT Sensor Signal

75

PNK

1020

Off/Run/Crank Voltage

76

BLK/WHT

845

Fuel Injector 5 Control

77

DK BLU/WHT

878

Fuel Injector 8 Control

78

--

--

Not Used

79

WHT

687

3-2 Shift Solenoid Valve Control

80

GRY

720

Low Reference

Powertrain Control Module (PCM)-C2


Object Number: 684875  Size: CH

Connector Part Information

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

Pin

Wire Color

Circuit No.

Function

1

BLK/WHT

451

Ground

2

BRN

418

TCC PWM Solenoid Valve Control

3-5

--

--

Not Used

6

RED/BLK

1228

PC Solenoid Valve High Control (Sol. A)

7

--

--

Not Used

8

LT BLU/WHT

1229

PC Solenoid Valve Low Control (Sol. A)

9

DK GRN/WHT

465

Fuel Pump Relay Control

10

WHT

121

Engine Speed Signal

11-13

--

--

Not Used

14

RED/BLK

380

A/C Refrigerant Pressure Sensor Signal

15

BRN

25

Charge Indicator Control

16

GRY/BLK

1694

4WD Low Signal

17-19

--

--

Not Used

20

LT GRN/BLK

822

VSS Low Signal

21

PPL/WHT

821

VSS High Signal

22-24

--

--

Not Used

25

TAN

472

IAT Sensor Signal

26

PPL

2121

IC 1 Control

27

RED

2127

IC 7 Control

28

LT BLU/WHT

2126

IC 6 Control

29

DK GRN/WHT

2124

IC 4 Control

30

--

--

Not Used

31

YEL

492

MAF Sensor Signal

32

LT GRN

432

MAP Sensor Signal

33

--

--

Not Used

34

DK GRN/WHT

428

EVAP Canister Purge Solenoid Control

35-38

--

--

Not Used

39

RED

631

12 Volt Reference

40

BLK/WHT

451

Ground

41

--

--

Not Used

42

TAN/BLK

422

TCC Solenoid Valve Control

43

DK GRN/

WHT

459

A/C Compressor Clutch Relay Control

44

--

--

Not Used

45

WHT

1310

EVAP Canister Vent Solenoid Control

46

BRN/WHT

419

MIL Control

47

YEL/BLK

1223

2-3 Shift Solenoid Valve Control

48

LT GRN

1222

1-2 Shift Solenoid Valve Control

49

--

--

Not Used

50

DK GRN/WHT

817

Vehicle Speed Signal

51

YEL/BLK

1227

TFT Sensor Signal

52

BRN

2391

HO2S Heater Low Control - Bank 1 Sensor 2

53

RED/WHT

3223

HO2S Heater Low Control - Bank 2 Sensor 2

54

PPL/WHT

1589

Fuel Level Sensor Signal

55-56

--

--

Not Used

57

BLK

552

Low Reference

58

TAN/WHT

332

Oil Pressure Sensor Signal

59

PPL

806

Crank Voltage

60

BRN

2129

Low Reference

61

BRN/WHT

2130

Low Reference

62

GRY

773

Transmission Range Switch Signal C

63

PNK

1224

Transmission Fluid Pressure Switch Signal A

64

DK GRN

890

Fuel Tank Pressure Sensor Signal

65

--

--

Not Used

66

PPL/WHT

2128

IC 8 Control

67

RED/WHT

2122

IC 2 Control

68

DK GRN

2125

IC 5 Control

69

LT BLU

2123

IC 3 Control

70-71

--

--

Not Used

72

BLK/WHT

3113

HO2S Heater Low Control - Bank 1 Sensor 1

73

--

--

Not Used

74

LT GRN

3212

HO2S Heater Low Control - Bank 2 Sensor 1

75

GRY

23

Generator Field Duty Cycle Signal

76-79

--

--

Not Used

80

BLK

2751

Low Reference