GM Service Manual Online
For 1990-2009 cars only
Table 1: PCM Connector C1 (Red)
Table 2: PCM Connector C2 (Blue)

PCM Connector C1 (Red)


Object Number: 23346  Size: CF

Connector Part Information

    • PCM Connector C1 (Red)
    • 80 Pin Connector

Pin

Wire Color

Circuit No.

Function

1-2

--

--

Not Used

3

WHT

1310

EVAP Canister Vent Solenoid Valve Control

4

BRN/WHT

633

Camshaft Position Sensor Signal

5-6

--

--

Not Used

7

YEL

400

VSS Signal High

8

--

--

Not Used

9

PNK/BLK

1746

Injector #3 Control

10

--

--

Not Used

11

DK BLU

229

VTD Fuel Enable

12

LT BLU/BLK

844

Injector #4 Control

13

RED/WHT

2122

Ignition #2 Control

14

DK GRN

59

A/C Status

15

BLK/WHT

845

Injector #5 Control

16-17

--

--

Not Used

18

YEL/BLK

846

Injector #6 Control

19-20

--

--

Not Used

21

PPL

719

IAT Sensor Ground

22

DK BLU

1225

Transmission Range Signal B

23

LT GRN/BLK

1745

Injector #2 Control

24

BLK/WHT

1704

Sensor Ground Jumper

25

PNK

1224

Transmission Range Signal A

26

--

--

Not Used

27

RED/BLK

877

Injector #7 Control

28-29

--

--

Not Used

30

GRY/BLK

1687

Spark Retard Signal

31

DK BLU/WHT

878

Injector #8 Control

32

ORN/BLK

434

PNP Switch Signal

33

BLK

1744

Injector #1 Control

34

GRY or WHT

587 or 687

Skip Shift Solenoid (M/T) or 3-2 Shift Solenoid (A/T)

35

LT GRN

1222

1-2 Shift Solenoid

36

DK/BLU

1936

Fuel Gauge Output Control

37

BRN/WHT

419

MIL Control

38

--

--

Not Used

39

DK GRN/WHT

459

A/C Clutch Relay Control

40

WHT or YEL/BLK

375 or 1223

Skip Shift Lamp Control (M/T) or 2-3 Shift Solenoid (A/T)

41

BRN/WHT

1173

Low Oil Level Indicator Lamp Control

42

LT GRN

1652

Reverse Inhibit Solenoid Control

43

DK/GRN

335

Cooling Fan Relay #1 Control

44

YEL

573

Crankshaft Position Sensor Signal Input

45

DK GRN/WHT

428

EVAP Canister Purge Valve Control

46

--

--

Not Used

47

DK GRN/WHT

762

A/C Request Signal

48

YEL

492

MAF Signal

49

PPL

2121

Ignition #1 Control

50-51

--

--

Not Used

52

PPL/WHT

2128

Ignition #8 Control

53

RED

2127

Ignition #7 Control

54

LT BLU/WHT

2126

Ignition #6 Control

55

DK GRN/WHT

817

VSS Output Signal

56

DK GRN

2125

Ignition #5 Control

57

DK GRN/WHT

2124

Ignition #4 Control

58

LT BLU

2123

Ignition #3 Control

59

BRN/WHT

2130

Ignition Control Reference Low Bank 2

60

BRN

2129

Ignition Control Reference Low Bank 1

61

RED

1226

Transmission Range Signal C

62

BLK

552

EGR Pintle Position Ground

63

BLK

407

A/C Refrigerant Pressure Sensor Ground

64-70

--

--

Not Used

71

PPL

401

VSS Signal Low

72

BLK

451

PCM Ground

73-74

--

--

Not Used

75

GRY

720

Left and Right Fuel Tank Level Sensor Ground

76

BLK

451

PCM Ground

77

PPL

420

TCC/Brake Switch Signal

78-80

--

--

Not Used

PCM Connector C2 (Blue)


Object Number: 23346  Size: CF

Connector Part Information

    • PCM Connector C2 (Blue)
    • 80 Pin Connector

Pin

Wire Color

Circuit No.

Function

1

TAN

1671

HO2S Signal Low Bank 2 Sensor 2

2

TAN/WHT

1669

HO2S Signal Low Bank 1 Sensor 2

3

TAN

800

Serial Data (UART)

4

RED

631

Camshaft Position Sensor B+ Supply

5

TAN

1667

HO2S Signal Low Bank 2 Sensor 1

6

TAN/WHT

1653

HO2S Signal Low Bank 1 Sensor 1

7

RED/BLK

380

A/C Refrigerant Pressure Sensor Signal

8

TAN

472

IAT Sensor Signal

9

BRN

1456

EGR Pintle Position Sensor Signal

10

PPL

30

Fuel Level Sensor Signal

11

--

--

Not Used

12

DK BLU

417

TP Sensor Signal

13

YEL/BLK

1227

Transmission Fluid Temperature Sensor Signal

14

ORN/BLK

1057

Transmission Fluid Temperature Sensor Ground

15-18

--

--

Not Used

19

PNK

439

PCM Ignition 1 Feed

20

ORN

340

PCM Battery Feed

21

BLK

451

PCM Ground

22

YEL/BLK

1868

Crankshaft Position Sensor Ground

23

BLK

452

TP Sensor Ground

24

BLK/WHT

1704

Sensor Ground Jumper

25

BRN

718

ECT Sensor Ground

26

ORN/BLK

469

MAP Sensor Ground

27

--

--

Not Used

28

DK BLU

473

Engine Cooling Fan Relay #2 and #3 Control

29

--

--

Not Used

30

BRN

436

AIR Pump Relay Control

31

PPL

421

AIR Solenoid Relay Control

32

TAN/BLK

422

TCC Enable Solenoid

33

BRN

418

TCC (PWM) Solenoid Valve Control

34

GRY

435

EGR Valve Ground

35

WHT

121

Engine Speed (Tach) Output Signal

36

LT BLU/WHT

1229

Transmission Fluid Pressure Control Solenoid Control Low

37

DK GRN/WHT

465

Fuel Pump Relay Control

38

LT BLU

697

EGR Valve Control Circuit

39

RED/BLK

1228

Transmission Fluid Pressure Control Solenoid Control High

40

--

--

Not Used

41

PPL

1670

HO2S Signal High Bank 2 Sensor 2

42

PPL/WHT

1668

HO2S Signal High Bank 1 Sensor 2

43

GRY

596

TP Sensor 5V Reference

44-45

--

--

Not Used

46

PPL

1666

HO2S Signal High Bank 2 Sensor 1

47

PPL/WHT

1665

HO2S Signal High Bank 1 Sensor 1

48

LT GRN

432

MAP Sensor Signal

49

YEL

410

ECT Sensor Signal

50-51

--

--

Not Used

52

DK GRN

890

Fuel Tank Pressure Sensor Signal

53

--

--

Not Used

54

LT GRN/BLK

444

IAC Coil B Low

55

LT BLU/BLK

1748

IAC Coil A Low

56

LT BLU/WHT

1747

IAC Coil A High

57

LT GRN/WHT

1749

IAC Coil B High

58

PPL

1807

Serial Data (Class 2)

59

--

--

Not Used

60

BLK

451

PCM Ground

61

ORN

340

PCM Battery Feed

62

LT GRN

1867

Crankshaft Position Sensor B+ Supply

63

--

--

Not Used

64

GRY

416

MAP Sensor 5.0 Volt Reference

65

GRY

705

5V Reference

66

GRY

474

A/C Refrigerant Pressure Sensor 5.0 Volt Reference

67

GRY

598

5V Reference

68

LT BLU

1876

Knock Sensor (KS) Rear

69

DK BLU

496

Knock Sensor (KS) Front

70

PNK/BLK

632

Camshaft Position Sensor Ground

71-75

--

--

Not Used

76

BRN

1174

Oil Level Sensor Signal

77-80

--

--

Not Used