GM Service Manual Online
For 1990-2009 cars only
Table 1: Engine Control Module (ECM) C1
Table 2: Engine Control Module (ECM) C2

Engine Control Module (ECM) C1


Object Number: 816165  Size: CH

Connector Part Information

    • 1928403379
    • 64-Way F (BK)

Pin

Wire Color

Circuit Number

Function

1

YE

581

TAC Motor Control - 1

2

YE

5036

HO2S Heater Low Control Bank 2 Sensor 2

3

PK/BK

1746

Fuel Injector 3 Control

4

L-BU/WH

5041

Intake Manifold - Output - 1

5

D-GN/WH

428

EVAP Canister Purge Solenoid Control

6

TN

407

Low Reference

7

TN

1671

HO2S Low Signal Bank 2 Sensor 2

8

BN/WH

633

Camshaft Sensor Signal

9

--

--

Not Used

10

WH/BK

5039

CKP Sensor High

11

--

--

Not Used

12

TN

1667

HO2S Low Signal Bank 2 Sensor 1

13

--

--

Not Used

14

D-GN

2125

IC 5 Control

15

L-BU

2123

IC 3 Control

16

PU

2121

IC 1 Control

17

BN

582

TAC Motor Control - 2

18

PU/WH

5037

HO2S Heater Low Control Bank 2 Sensor 1

19

TN

1744

Fuel Injector 1 Control

20

TN/WH

845

Fuel Injector 5 Control

21

BN/WH

379

CPP Switch Signal

22

D-BU

496

Knock Sensor [1] Signal

23

PU/WH

1668

HO2S High Signal Bank 1 Sensor 2

24

D-GN

485

TP Sensor 1 Signal

25

YE

410

ECT Sensor Signal

26

TN

2761

Low Reference

27

--

--

Not Used

28

PU/WH

1665

HO2S High Signal Bank 1 Sensor 1

29

TN/BU

231

Oil Pressure Switch Signal

30

OG/WH

2122

IC 2 Control

31

D-GN/WH

2124

IC 4 Control

32

L-BU/WH

2126

IC 6 Control

33

YE

581

TAC Motor Control - 1

34

PU

5035

HO2S Heater Low Control Bank 1 Sensor 2

35

L-GN/BK

1745

Fuel Injector 2 Control

36

YE/BK

846

Fuel Injector 6 Control

37

--

--

Not Used

38

L-BU

1876

Knock Sensor 2 Signal

39

PU

1670

HO2S High Signal Bank 2 Sensor 2

40

PU

486

TP Sensor 2 Signal

41

--

--

Not Used

42

TN

2752

Low Reference

43

--

--

Not Used

44

PU

1666

HO2S High Signal Bank 2 Sensor 1

45-48

--

--

Not Used

49

BN

582

TAC Motor Control - 2

50

L-BU

5038

HO2S Heater Low Control Bank 1 Sensor 1

51

TN

2760

Low Reference

52

L-BU/BK

844

Fuel Injector 4 Control

53

PU/BK

5042

Intake Manifold - Output - 2

54

GY

1716

Low Reference

55

TN/WH

1669

HO2S Low Signal Bank 1 Sensor 2

56

YE

492

MAF Sensor Signal

57

TN

472

IAT Sensor Signal

58

GY

2701

5 Volt Reference

59

PU/WH

5024

CKP Sensor Low

60

TN/WH

1653

HO2S Low Signal Bank 1 Sensor 1

61

--

--

Not Used

62

BK

1705

Shielded Ground

63-64

--

--

Not Used

Engine Control Module (ECM) C2


Object Number: 816166  Size: CH

Connector Part Information

    • 1928403514
    • 64-Way F (BK)

Pin

Wire Color

Circuit Number

Function

1-3

--

--

Not Used

4

GY

23

Generator Field Duty Cycle Signal

5

GY/BK

87

Cruise Control Resume/Accel Switch Signal

6

OG/BK

380

A/C Refrigerant Pressure Sensor Signal

7

TN

1274

5 Volt Reference

8

D-BU

1161

APP Sensor 1 Signal

9-10

--

--

Not Used

11

OG

225

Generator Turn On Signal

12

--

--

Not Used

13

D-GN/WH

459

A/C Compressor Clutch Relay Control

14

--

--

Not Used

15

RD/WH

1440

Battery Positive Voltage

16

PK

639

Ignition 1 Voltage

17

YE

5

Crank Voltage

18

WH

1310

EVAP Canister Vent Solenoid Control

19

BN

818

Vehicle Speed Signal

20-21

--

--

Not Used

22

D-BU

1936

Fuel Level Sensor Signal Primary

23

OG/BK

1786

Park/Neutral Signal (AT)

23

PU/WH

1035

Starter Relay Coil Supply Voltage (MT)

24

BN

1271

Low Reference

25

PU

1272

Low Reference

26

PU

420

TCC Brake Switch/Cruise Control Release Signal

27

WH

17

Stop Lamp Switch Signal

28

OG/BK

463

Requested Torque Signal

29

BN

1271

Low Reference

30

D-GN/WH

465

Low Reference

31

BN

5069

Main Relay Control

32

PK

639

Ignition 1 Voltage

33

D-BU

473

High Speed Cooling Fan Relay Control

34

TN

2759

Low Reference

35

WH

121

Engine Speed Signal

36

--

--

Not Used

37

D-GN

890

Fuel Tank Pressure Sensor Signal

38

L-BU

1937

Fuel Level Sensor Signal Secondary

39

YE

447

Starter Relay Coil Control

40

L-BU

1162

APP Sensor 2 Signal

41

GY

847

Extended Travel Brake Switch Signal

42-43

--

--

Not Used

44

YE

400

Signal High - Front (M35)

45

WH

2500

High Speed GMLAN Serial Data Bus+

46

BN/WH

419

MIL Control

47

PK

239

Ignition 1 Voltage

48

PK

639

Ignition 1 Voltage

49

--

--

Not Used

50

D-GN

335

Low Speed Cooling Fan Relay Control

51

TN

470

Low Reference

52

TN/BK

464

Delivered Torque Signal

53

WH/BK

5043

Keyword 2000 Serial Data

54

--

--

Not Used

55

PU

1807

Class 2 Serial Data (Primary)

56

WH/BK

1164

5 Volt Reference

57

PU

1807

Class 2 Serial Data (Primary)

58-59

--

--

Not Used

60

TN

5003

Traction Control Data Signal

61

GN

2501

High Speed GMLAN Serial Data Bus-(Auto Trans)

62

PU

5128

Auxiliary Cooling Fan Relay Control

63

GY

2709

5 Volt Reference

64

YE

343

Accessory Voltage