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

    â€¢ 12191489
    â€¢ 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

ORN/BLK

463

Requested Torque Signal

14

ORN/BLK

1061

UART Serial Data

15

DK BLU/

WHT

774

UART Serial Data

16-17

--

--

Not Used

18

DK GRN

1433

Clutch Start Switch Signal (M/T)

19

PNK

439

Ignition 1 Voltage

20

ORN

440

Battery Positive Voltage

21

YEL/BLK

1868

Low Reference

22

LT GRN

488

PTO Enable Switch (w/PTO)

23

BLK

470

Low Reference

24

BLK/WHT

451

Ground

25

TAN

1671

HO2S Low Signal Bank 2 Sensor 2 (w/NC1)

26

TAN

1677

HO2S Low Signal Bank 2 Sensor 1

27

BLK/WHT

451

Ground

28

TAN

1669

HO2S Low Signal Bank 1 Sensor 2 (w/NC1)

29

TAN

1664

HO2S Low Signal Bank 1 Sensor 1

30

LT GRN

1478

Coolant Level Switch Signal

31 - 32

--

--

Not Used

33

PPL

420

TCC Brake Switch/Cruise Control Release Signal

34

ORN/BLK

1786

Park/Neutral Signal (Allison Transmission Only)

35

GRY

48

CPP Switch Signal (M/T)

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

PPL

719

Low Reference

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

GRY

596

5 Volt Reference

48

GRY

597

5 Volt Reference

49-50

--

--

Not Used

51

DK BLU

496

Knock Sensor 1 Signal

52

YEL

2522

PTO Status (w/PTO)

53

--

--

Not Used

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

--

--

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 (w/NC1)

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 (w/NC1)

69

PPL/WHT

1665

HO2S High Signal Bank 1 Sensor 1

70

BRN

1174

Oil Level Switch Signal

71

LT BLU

494

PTO Engine Kill (w/PTO)

72

--

--

Not Used

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

PPL

2562

PTO Engage (w/PTO)

79

--

--

Not Used

80

BLK

407

Low Reference

Powertrain Control Module (PCM) - C2


Object Number: 684875  Size: CH

Connector Part Information

    â€¢ 12191488
    â€¢ 80-Way F Micro-Pack 100W Sealed (GRN)

Pin

Wire Color

Circuit No.

Function

1

BLK/WHT

451

Ground

2

WHT

2467

Torque Response Reply Signal (Allison Trans Only)

3

TAN

1465

Fuel Pump Relay Control - Secondary

4

--

--

Not Used

5

TAN/BLK

464

Delivered Torque Signal (Allison Trans Only)

6

--

--

Not Used

7

RED

1676

EGR Valve Supply Voltage

8

--

--

Not Used

9

DK GRN/

WHT

465

Fuel Pump Relay Control

10

WHT

121

Engine Speed Signal

11

--

--

Not Used

12

DK BLU

2466

Trans MIL Request Signal (Allison Trans Only)

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 (w/4WD)

17 - 18

--

--

Not Used

19

BLK/WHT

1695

Axle Switch Signal (w/NP2)

20

LT GRN/BLK

822

VSS Low Signal

21

PPL/WHT

821

VSS High Signal (Except Allison Transmission

YEL

400

Signal High - Front (Allison Trans Only)

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

WHT

257

EGR Solenoid Control

42

--

--

Not Used

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 - 48

--

--

Not Used

49

YEL/BLK

1827

Vehicle Speed Signal

50

DK GRN/

WHT

817

Vehicle Speed Signal

51

--

--

Not Used

52

BRN

2391

HO2S Heater Low Control Bank 1 Sensor 2 (W/NC1)

53

RED/WHT

3223

HO2S Heater Low Control Bank 2 Sensor 2 (W/NC1)

54

PPL

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 - 63

--

--

Not Used

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

3122

HO2S Heater Low Control Bank 1 Sensor 2 (w/NC1)

73

DK BLU

1936

Fuel Level Sensor Signal - Secondary

74

LT GRN/WHT

3213

HO2S Heater Low Control Bank 2 Sensor 1

75-79

--

--

Not Used

80

BLK

2751

Low Reference