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

Powertrain Control Module (PCM) - C1 (Blue)


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

PNK/BLK

1746

Fuel Injector 3 Control

4

LT GRN/BLK

1745

Fuel Injector 2 Control

5 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 [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

GRN LT

488

Power Take Off Switch - Enable

23

BLK

470

Low Reference

24

--

--

Not Used

25

TAN

413

HO2S Low Reference (Denso Sensors) HO2S Low Signal (Delphi Sensors)

26

TAN

413

HO2S Low Reference (Denso Sensors) HO2S Low Signal (Delphi Sensors)

27

--

--

Not Used

28

TAN

413

HO2S Low Reference (Denso Sensors) HO2S Low Signal (Delphi Sensors)

29

TAN

413

HO2S Low Reference (Denso Sensors) HO2S Low Signal (Delphi Sensors)

30

LT GRN

1478

Coolant Level Switch Signal

31 32

--

--

Not Used

33

PPL

420

TCC Brake Switch Signal

34

WHT

776

Transmission Range Switch Signal P

35

GRY

48

CPP Switch Signal

36

BLK

1744

Fuel Injector 1 Control

37

YEL/BLK

846

Fuel Injector 6 Control

38

PNK/WHT

1101

Damping Lift/Dive Signal

39

--

--

Not Used

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

474

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

KS [1] Signal

52

YEL

2522

Power Take Off (PTO) Status

53

BLK

470

Low Reference (Allison)

53

BLK

407

Low Reference (4L80E)

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

ECM/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

GRY

720

Low Reference

63

TAN

413

HO2S Low Reference (Denso Sensors) HO2S Low Signal (Delphi Sensors)

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

LT BLU

494

Power Take Off (PTO) Engine Defeat Switch

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

PPL

2562

Power Take Off (PTO) Engage Signal

79

--

--

Not Used

80

ORN/BLK

510

Low Reference

Powertrain Control Module (PCM) - C2 (RED)


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

WHT

2467

Unmanaged Torque Signal (M74)

2

BRN

418

TCC PWM Solenoid Valve Control (4L80E)

3

TAN

1465

Fuel Pump Relay Control [- Secondary]

4

--

--

Not Used

5

TAN/BLK

464

Delivered Torque Signal

6

RED/BLK

1228

PC Solenoid Valve High Control (Sol. A)

7

RED

1676

EGR Valve Supply Voltage

8

LT BLU/WHT

1229

PC Solenoid Valve Low Control (Sol. A)

9

DK GRN/WHT

465

Fuel Pump Relay Control [- Primary]

10

WHT

121

Engine Speed Signal

11

DK BLU

604

A/C High Pressure Recirculation Switch Signal

12

DK GRN

1163

APP Sensor 3 Signal

13 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

RED/BLK

1230

AT ISS High Signal

23

DK BLU/WHT

1231

AT ISS Low Signal

24

DK BLU

417

TP Sensor Signal

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

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

--

--

Not Used

43

DK GRN/WHT

459

A/C Clutch Relay Control

44

PNK

1039

Ignition 1 Voltage

45

WHT

1310

EVAP Canister Vent Solenoid Control

46

BRN/WHT

419

MIL Control

47

YEL/BLK

1223

(2-3 Shift Solenoid or Shift Solenoid B) Valve Control

48

LT GRN

1222

(1-2 Shift Solenoid or Shift Solenoid A) 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

DK BLU

2687

Transmission MIL Request Signal

54

PPL

1589

Fuel Level Sensor Signal [- Primary]

55

DK GRN

603

A/C Low Pressure Switch Signal

56

--

--

Not Used

57

BLK

552

Low Reference

58 59

--

--

Not Used

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

3122

HO2S Heater Return Signal

73

DK BLU

1936

Fuel Level Sensor Signal [- Secondary]

74

LT GRN/WHT

3213

HO2S Heater Supply Voltage

75

RED/WHT

3222

HO2S Heater Supply Voltage

76 79

--

--

Not Used

80

LT GRN

3212

HO2S Heater Return Signal