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 (NAT)

Pin

Wire Color

Circuit No.

Function

1

BLK/WHT

451

Ground

2

LT GRN

1867

12 Volt Reference

3

--

--

Not Used

4

LT BLU/

BLK

844

Fuel Injector 4 Control

5-7

--

--

Not Used

8

GRY

416

5 Volt Reference

9

DK BLU

496

Knock Sensor (1) Signal

10

YEL

2361

CAN Serial Data High

11

--

--

Not Used

12

DK BLU/

WHT

1869

CKP Sensor Signal

13-16

--

--

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

--

--

Not Used

25

TAN

413

HO2S Low Reference Bank 2 Sensor 2 (LU3)

TAN

1671

HO2S Low Reference Bank 2 Sensor 2 (L35)

26

TAN

413

HO2S Low Reference Bank 2 Sensor 1 (LU3)

TAN

1667

HO2S Low Signal Bank 2 Sensor 1 (L35)

27

--

--

Not Used

28

TAN

413

HO2S Low Reference Bank 1 Sensor 2 (LU3)

TAN/WHT

1669

HO2S Low Signal Bank 1 Sensor 2 (L35)

29

TAN

413

HO2S Low Reference Bank 1 Sensor 1(LU3)

TAN/WHT

1653

HO2S Low Signal Bank 1 Sensor 1(L35)

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

GRY

48

CPP Switch Signal

36

BLK

1744

Fuel Injector 1 Control

37

PNK/BLK

1746

Fuel Injector 3 Control

38-39

--

--

Not Used

40

BLK/WHT

451

Ground

41

PPL

719

Low Reference

42

--

--

Not Used

43

BLK/WHT

845

Fuel Injector 5 Control

44-45

--

--

Not Used

46

GRY

474

5 Volt Reference

47

GRY

596

5 Volt Reference

48

GRY

597

5 Volt Reference

49

GRY

1716

Low Reference

50-52

--

--

Not Used

53

BLK

407

Low Reference

54

ORN/BLK

469

Low Reference

55

BRN

1456

EGR Valve Position Signal

56

--

--

Not Used

57

ORN

440

Battery Positive Voltage

58

DK GRN

1049

PCM Class 2 Serial Data

59

YEL

710

Class 2 Serial Data

60

ORN/BLK

510

Low Reference

61

PNK/BLK

632

Low Reference

62

--

--

Not Used

63

BLK

452

Low Reference

64

--

--

Not Used

65

PPL

1670

HO2S High Signal Bank 2 Sensor 2

66

PPL

1666

HO2S High Signal Bank 2 Sensor 1

67

--

--

Not Used

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

LT GRN/

BLK

1745

Fuel Injector 2 Control

77

YEL/BLK

846

Fuel Injector 6 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 (NAT)

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

7

RED

1676

EGR Valve Supply Voltage

8

LT BLU/

WHT

1229

PC Solenoid Valve Low Control

9

DK GRN/

WHT

465

Fuel Pump Relay Control

10

WHT

121

Engine Speed Signal

11

DK BLU

604

A/C High Pressure Recirculation Switch Signal

12

--

--

Not Used

13

LT BLU/

BLK

396

Cruise Control Engaged Signal

14

--

--

Not Used

15

BRN

25

Charge Indicator Control

16

GRY/BLK

1694

4WD Low Signal

17

DK GRN/

WHT

2523

A/C Request Signal

18

--

--

Not Used

19

BLK/WHT

1695

Axle Switch Signal

20

LT GRN/

BLK

822

VSS Low Signal

21

PPL/WHT

821

VSS High Signal

22-23

--

--

Not Used

24

DK BLU

417

TP Sensor Signal

25

TAN

472

IAT Sensor Signal

26

WHT

423

IC Timing Control

27-30

--

--

Not Used

31

YEL

492

MAF Sensor Signal

32

LT GRN

432

MAP Sensor Signal

33

DK GRN

1614

Recirculation Door Control

34

DK GRN/

WHT

428

EVAP Canister Purge Solenoid Control

35

--

--

Not Used

36

BRN

436

AIR Pump Relay Control

37-38

--

--

Not Used

39

RED

631

12 Volt Reference

40

BLK/WHT

451

Ground

41

WHT

257

EGR Solenoid Control

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

YEL/BLK

1827

Vehicle Speed Signal

50

DK GRN/

WHT

817

Vehicle Speed Signal

51

YEL/BLK

1227

TFT Sensor Signal

52

GRY

23

Generator Field Duty Cycle Signal

53

--

--

Not Used

54

PPL

1589

Fuel Level Sensor Signal

55

DK GRN

603

A/C Low Pressure Switch Signal

56

--

--

Not Used

57

BLK

552

Low Reference

58-60

--

--

Not Used

61

TAN

413

Low Reference (LU3)

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

65-75

--

--

Not Used

76

LT GRN/

WHT

1749

IAC Coil B High Control

77

LT GRN/

BLK

444

IAC Coil B Low Control

78

LT BLU/

BLK

1748

IAC Coil A Low Control

79

LT BLU/

WHT

1747

IAC Coil A High Control

80

--

--

Not Used