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/WH

451

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

8-10

--

--

Not Used

11

L-BU

1876

Knock Sensor 2 Signal

12

D-BU/

WH

1869

CKP Sensor Signal

13

--

--

Not Used

14

OG/BK

1061

UART Serial Data-Secondary

15

D-BU/

WH

774

UART Serial Data-Tertiary

16

--

--

Not Used

17

D-BU

1225

Transmission Fluid Pressure Switch Signal B

18

RD

1226

Transmission Fluid Pressure Switch Signal C

19

PK

439

Ignition 1 Voltage

20

OG

440

Battery Positive Voltage

21

YE/BK

1868

Low Reference

22

--

--

Not Used

23

BK

470

Low Reference

24

BK/WH

451

Ground

25

TN

1671

HO2S Low Signal - Bank 2 Sensor 2

26

TN

1667

HO2S Low Signal - Bank 2 Sensor 1

27

BK/WH

451

Ground

28

TN/WH

1669

HO2S Low Signal - Bank 1 Sensor 2

29

TN

1664

HO2S Low Signal - Bank 1 Sensor 1

30

L-GN

1478

Coolant Level Switch Signal

31

--

--

Not Used

32

BK/WH

771

Transmission Range Switch Signal A

33

PU

420

TCC Brake Switch/Cruise Control Release Signal

34

WH

776

Transmission Range Switch Signal P

35

--

--

Not Used

36

BK

1744

Fuel Injector 1 Control

37

YE/BK

846

Fuel Injector 6 Control

38

--

--

Not Used

39

YE/BK

625

Starter Enable Relay Control

40

BK/WH

451

Ground

41-42

--

--

Not Used

43

RD/BK

877

Fuel Injector 7 Control

44

L-BU/BK

844

Fuel Injector 4 Control

45

GY

2700

5 Volt Reference

46

GY

474

5 Volt Reference

47

--

--

Not Used

48

GY

597

5 Volt Reference

49-50

--

--

Not Used

51

D-BU

496

Knock Sensor 1 Signal

52

--

--

Not Used

53

BK

407

Low Reference

54

OG/BK

469

Low Reference

55-56

--

--

Not Used

57

OG

440

Battery Positive Voltage

58

D-GN

1049

PCM Class 2 Serial Data

59

YE

710

PCM Class 2 Serial Data

60

--

--

Not Used

61

PK/BK

632

Low Reference

62

--

--

Not Used

63

BK

2755

Low Reference

64

BK/WH

451

Ground

65

PU

1670

HO2S High Signal - Bank 2 Sensor 2

66

PU

1666

HO2S High Signal - Bank 2 Sensor 1

67

BK/WH

451

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

--

--

Not Used

72

YE

772

Transmission Range Switch Signal B

73

BN/WH

633

CMP Sensor Signal

74

YE

410

ECT Sensor Signal

75

PK

1020

Off/Run/Crank Voltage

76

BK/WH

845

Fuel Injector 5 Control

77

D-BU/WH

878

Fuel Injector 8 Control

78

--

--

Not Used

79

WH

687

3-2 Shift Solenoid Valve Control

80

GY

720

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/WH

451

Ground

2

BN

418

TCC PWM Solenoid Valve Control

3-5

--

--

Not Used

6

RD/BK

1228

PC Solenoid Valve High Control (Sol. A)

7

--

--

Not Used

8

L-BU/WH

1229

PC Solenoid Valve Low Control (Sol. A)

9

D-GN/WH

465

Fuel Pump Relay Control

10

WH

121

Engine Speed Signal

11-13

--

--

Not Used

14

RD/BK

380

A/C Refrigerant Pressure Sensor Signal

15

BN

25

Charge Indicator Control

16

GY/BK

1694

4WD Low Signal

17-19

--

--

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

RD

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

--

--

Not Used

34

D-GN/WH

428

EVAP Canister Purge Solenoid Control

35-38

--

--

Not Used

39

RD

631

12 Volt Reference

40

BK/WH

451

Ground

41

--

--

Not Used

42

TN/BK

422

TCC Solenoid Valve Control

43

D-GN/

WH

459

A/C Compressor Clutch Relay Control

44

--

--

Not Used

45

WH

1310

EVAP Canister Vent Solenoid Control

46

BN/WH

419

MIL Control

47

YE/BK

1223

Shift Solenoid B Valve Control

48

L-GN

1222

Shift Solenoid A Valve Control

49

--

--

Not Used

50

D-GN/WH

817

Vehicle Speed Signal

51

YE/BK

1227

TFT Sensor Signal

52

BN

2391

HO2S Heater Low Control - Bank 1 Sensor 2

53

RD/WH

3223

HO2S Heater Low Control - Bank 2 Sensor 2

54

PU/WH

1589

Fuel Level Sensor Signal

55-56

--

--

Not Used

57

BK

552

Low Reference

58

TN/WH

332

Oil Pressure Sensor Signal

59

PU

806

Crank Voltage

60

BN

2129

Low Reference

61

BN/WH

2130

Low Reference

62

GY

773

Transmission Range Switch Signal C

63

PK

1224

Transmission Fluid Pressure Switch Signal A

64

D-GN

890

Fuel Tank Pressure Sensor Signal

65

--

--

Not Used

66

PU/WH

2128

IC 8 Control

67

RD/WH

2122

IC 2 Control

68

D-GN

2125

IC 5 Control

69

L-BU

2123

IC 3 Control

70-71

--

--

Not Used

72

BK/WH

3113

HO2S Heater Low Control - Bank 1 Sensor 1

73

--

--

Not Used

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

BK

2751

Low Reference