GM Service Manual Online
For 1990-2009 cars only
Table 1: PCM Connector C1
Table 2: PCM Connector C2
Table 3: PCM Connector C3

PCM Connector C1


Object Number: 1228485  Size: CH

Connector Part Information

    • 15357147
    • 56-Way F Micro 64 (BLU)

Pin

Wire Color

Circuit No.

Function

1-2

--

--

Not Used

3

BRN

436

AIR Pump Relay Control

4

DK BLU

473

High Speed Cooling Fan Relay Control

5-7

--

--

Not Used

8

DK GRN/WHT

817

Vehicle Speed Signal

9-10

--

--

Not Used

11

RED/BLK

380

A/C Refrigerant Pressure Sensor Signal

12

PPL

1589

Fuel Level Sensor Signal - Primary

13-14

--

--

Not Used

15

PPL

1807

Class 2 Serial Data

16

PPL

1807

Class 2 Serial Data

17

--

--

Not Used

18

WHT

1310

EVAP Canister Vent Solenoid Control

19

PNK

39

Ignition 1 Voltage

20

ORN

240

Battery Positive Voltage

21

--

--

Not Used

22

DK GRN

83

Cruise Control Inhibit Signal

23

WHT

121

Engine Speed Signal

24-30

--

--

Not Used

31

GRY

479

5-Volt Reference

32

BLK

2751

Low Reference

33-34

--

--

Not Used

35

BLK

808

Low Reference

36-37

--

--

Not Used

38

WHT

1390

Off/Run/Crank Voltage

39

GRY

847

Extended Travel Brake Switch Signal

40

--

--

Not Used

41

DK GRN

890

Fuel Tank Pressure Sensor Signal

42

--

--

Not Used

43

GRY

2700

5-Volt Reference

44

DK GRN/WHT

465

Fuel Pump Relay Control - Primary

45

YEL

447

Starter Relay Coil Control

46

DK GRN

335

Low Speed Cooling Fan Relay Control

47

--

--

Not Used

48

LT BLU/BLK

396

Cruise Control Engaged Signal

49-50

--

--

Not Used

51

PPL

420

TCC Brake Switch/Cruise Control Release Signal

52

YEL

5

Crank Voltage

53-54

--

--

Not Used

55

BRN/WHT

419

MIL Control

56

DK GRN/WHT

459

A/C Compressor Clutch Relay Control

PCM Connector C2


Object Number: 1228486  Size: CH

Connector Part Information

    • 15357131
    • 73-Way F Micro 64 (BLK)

Pin

Wire Color

Circuit No.

Function

1

BRN

1174

Oil Level Switch Signal

2

RED

1676

EGR Solenoid High Control

3

PPL/WHT

421

AIR Solenoid Relay Control

4

--

--

Not Used

5

TAN/WHT

3111

HO2S Low Signal Bank 1 Sensor 1

6

GRY/WHT

2702

5-Volt Reference JL9

7

--

--

Not Used

8

GRY

2701

5-Volt Reference

9

GRY

435

EGR Solenoid Low Control or EGR Solenoid Control

10

RED

225

Generator Turn On Signal

11

LT BLU

1876

Knock Sensor 2 Signal

12

GRY

23

Generator Field Duty Cycle Signal

13

GRY

1716

Knock Sensor 1 (KS 1) Low Reference

14

--

--

Not Used

15

PPL

3120

HO2S High Signal Bank 1 Sensor 2

16

BRN

1456

EGR Valve Position Signal

17

LT GRN/WHT

1749

IAC Coil B High Control

18

YEL

410

ECT Sensor Signal

19

DK BLU

496

Knock Sensor 1 Signal

20

TAN/WHT

3121

HO2S Low Signal Bank 1 Sensor 2

21

PNK/BLK

632

Low Reference

22

DK BLU

417

TP Sensor Signal

23

PPL

2121

IC 1 Control

24

LT BLU/WHT

2126

IC 6 Control

25

ORN

1799

High Resolution Signal

26

--

--

Not Used

27

GRY

2303

Low Reference Knock Sensor 2 (KS 2)

28

YEL/BLK

573

Crank Sensor B Signal

29

PPL/WHT

3110

HO2S High Signal Bank 1 Sensor 1

30

GRY

2704

5-Volt Reference - MAP

31

LT BLU/WHT

1800

Crank Sensor A Signal

32

--

--

Not Used

33

BLK

2761

Low Reference - Coolant Sensor

34

RED

2127

IC 7 Control

35

BLK

2753

Low Reference - EGR

36

ORN/BLK

469

Low Reference - MAP

37

BLK

2752

Low Reference - TPS

38

--

--

Not Used

39

BRN

2129

Low Reference - EST Bank 1

40

--

--

Not Used

41

YEL/BLK

1868

Low Reference

42

BRN/WHT

2130

Low Reference - EST Bank 2

43

LT BLU

2123

IC 3 Control

44-45

--

--

Not Used

46

YEL

2868

Low Reference - Crank Return

47

TAN/BLK

231

Oil Pressure Switch Signal

48

--

--

Not Used

49

RED

631

12-Volt Reference

50

LT GRN

1867

12-Volt Reference

51

LT GRN

2867

12-Volt Reference

52

--

--

Not Used

53

LT BLU/BLK

1748

IAC Coil A Low Control

54

BLK/WHT

3113

HO2S Heater Low Control Bank 1 Sensor 1

55

BLK/WHT

845

Fuel Injector  5 Control

56

BRN

3122

HO2S Heater Low Control Bank 1 Sensor 2

57

DK BLU/WHT

878

Fuel Injector 8 Control

58

LT GRN/BLK

444

IAC Coil B Low Control

59

LT BLU/BLK

844

Fuel Injector 4 Control

60

YEL/BLK

846

Fuel Injector 6 Control

61

LT BLU/WHT

1747

IAC Coil A High Control

62

DK GRN/WHT

2124

IC 4 Control

63

PPL/WHT

2128

IC 8 Control

64

DK GRN

2125

IC 5 Control

65

RED/WHT

2122

IC 2 Control

66

PNK/BLK

1746

Fuel Injector 3 Control

67

LT GRN

432

MAP Sensor Signal

68

--

--

Not Used

69

RED/BLK

877

Fuel Injector 7 Control

70

DK GRN/WHT

428

EVAP Canister Purge Solenoid Control

71

BLK

1744

Fuel Injector 1 Control

72

LT GRN

1745

Fuel Injector 2 Control

73

BLK/WHT

451

Ground

PCM Connector C3


Object Number: 1228487  Size: CH

Connector Part Information

    •  15357148
    • 56-Way F Micro 64 (GRY)

Pin

Wire Color

Circuit No.

Function

1

PNK

1224

Transmission Fluid Pressure Switch Signal A

2

YEL/BLK

1223

2-3 Shift Solenoid or Shift Solenoid B Valve Control

3

LT BLU/WHT

1229

PC Solenoid Valve Low Control (Sol. A)

4

TAN/BLK

464

Delivered Torque Signal

5

YEL

772

Transmission Range Switch Signal B

6

GRY

773

Transmission Range Switch Signal C

7

WHT

776

Transmission Range Switch Signal P

8-9

--

--

Not Used

10

YEL/BLK

1227

TFT Sensor Signal

11

YEL

492

MAF Sensor Signal

12-15

--

--

Not Used

16

LT GRN

3212

HO2S Heater Low Control Bank 2 Sensor 1

17-18

--

--

Not Used

19

TAN/WHT

3211

HO2S Low Signal Bank 2 Sensor 1

20-21

--

--

Not Used

22

PPL

401

Signal Low - Front/VSS Low Signal/OSS Low Signal

23-26

--

--

Not Used

27

ORN/BLK

463

Requested Torque Signal

28-31

--

--

Not Used

32

BLK/WHT

771

Transmission Range Switch Signal A

33

DK BLU/WHT

1231

AT ISS Low Signal

34

BLK

2760

Low Reference - IAT

35

BLK

2762

Low Reference - Trans Fluid Temp Sensor

36-42

--

--

Not Used

43

PPL/WHT

3210

HO2S High Signal Bank 2 Sensor 1

44

LT GRN

1222

Valve Control - 1-2 Shift Solenoid or Shift Solenoid A

45

RED/BLK

1228

PC Solenoid Valve High Control (Sol. A)

46

--

--

Not Used

47

YEL

400

Signal High - Front/VSS High Signal/OSS High Signal

48

RED

1226

Transmission Fluid Pressure Switch Signal C

49-50

--

--

Not Used

51

TAN

472

IAT Sensor Signal

52-53

--

--

Not Used

54

RED/PNK

1230

AT ISS High Signal

55

TAN/BLK

422

TCC Solenoid Valve Control

56

--

--

Not Used