GM Service Manual Online
For 1990-2009 cars only

Engine Control Module Connector End Views W/O CTF

Table 1: Engine Control Module (ECM) C1
Table 2: Engine Control Module (ECM) C2
Table 3: Engine Control Module (ECM) C3
Table 4: Engine Control Module (ECM) C4
Table 5: Engine Control Module (ECM) C5

Engine Control Module (ECM) C1


Object Number: 854605  Size: CH

Connector Part Information

    • 15324547
    • 31-Way F (WH)

Pin

Wire Color

Circuit No.

Function

1

OG

440

Battery Positive Voltage

2

YE/BK

846

Fuel Injector 4 Control

3

BK/WH

845

Fuel Injector 2 Control

4

L-BU/BK

844

Fuel Injector 6 Control

5

PK/BK

1746

Fuel Injector 3 Control

6

L-GN/BK

1745

Fuel Injector 5 Control

7

BK

1744

Fuel Injector 1 Control

8

D-GN/WH

459

A/C Compressor Clutch Relay Control

9

PK

439

Ignition 1 Voltage

10

PK

1020

Off/Run/Crank Voltage

11-12

--

--

Not Used

13

YE

447

Starter Relay Coil Control

14-18

--

--

Not Used

19

BN

5347

Air Heater Relay Control

20

D-BU

467

Injector Power 1

21

D-BU

467

Injector Power 1

22-23

--

--

Not Used

24

PU

2562

PTO Control

25

YE

505

Glow Plug Relay Control

26

D-BU

507

Wait to Start Indicator Control

27

L-BU

1121

ECM Power Enable 1

28

L-BU

1121

ECM Power Enable 2

29

BK

450

Ground

30

D-GN

468

Injector Power 2

31

D-GN

468

Injector Power 2

Engine Control Module (ECM) C2


Object Number: 854606  Size: CH

Connector Part Information

    • 15324546
    • 24-Way F (WH)

Pin

Wire Color

Circuit No.

Function

1

BK/WH

1451

Ground

2

BK/WH

1451

Ground

3

BK/WH

1451

Ground

4

BK/WH

1120

ECM Power Enable 1

5

BK/WH

1120

ECM Power Enable 2

6

L-GN

24

Backup Lamp Supply Voltage

7

--

--

Not Used

8

BK/WH

1451

Ground

9

BK/WH

1451

Ground

10

GY/BK

87

Cruise Control Switch Signal

11

PU

2656

Exhaust Brake Request

12

BN/WH

419

MIL Control

13

--

--

Not Used

14

GY

397

Cruise Control On Switch Signal

15

D-GN

1433

Clutch Start Switch Signal

16

RD

2013

High Idle Indicator Control

17

BK/WH

1451

Ground

18

BK/WH

1451

Ground

19

D-BU

84

Cruise Control Set/Coast Switch Signal

20

--

--

Not Used

21

BN/WH

379

CPP Switch Signal

22

WH

121

Engine Speed Signal

23

GY/BK

1467

Air Shift Switch Signal (AIR OPERATED)

24

D-GN

534

High Idle Switch Signal

Engine Control Module (ECM) C3


Object Number: 854607  Size: CH

Connector Part Information

    • 15324545
    •  17-Way F (WH)

Pin

Wire Color

Circuit No.

Function

1-3

--

--

Not Used

4

D-GN

1049

ECM/PCM/VCM Class 2 Serial Data

5

--

--

Not Used

6

BN

1174

Oil Level Switch Signal

7

L-GN

1478

Coolant Level Switch Signal

8

L-BU

494

PTO Kill Switch

9

L-GN

2081

Exhaust Brake Switch

10

D-GN/WH

817

Vehicle Speed Signal

11

YE/BK

1827

Vehicle Speed Signal

12

--

--

Not Used

13

YE

2522

PTO Feedback

14

L-GN

488

PTO Enable

15

--

--

Not Used

16

L-BU

1320

CHMSL Supply Voltage/Stop Lamp Supply Voltage

17

PU

420

TCC Brake Switch/Cruise Control Release Signal

Engine Control Module (ECM) C4


Object Number: 854608  Size: CH

Connector Part Information

    • 15316523
    • 28-Way F (WH)

Pin

Wire Color

Circuit No.

Function

1

BN

1476

Crankshaft Position (CKP) Sensor Low Reference

2

TN

1274

5-Volt Reference

3

YE/BK

1275

5-Volt Reference

4

YE

2361

CAN Serial Data High

5

OG/BK

726

16-Volt Reference

6

D-BU/WH

2671

12-Volt Reference

7

GY

705

5-Volt Reference

8

L-GN/BK

2670

Sensor Signal

9

GY

2365

Low Reference

10

D-BU

1475

Crankshaft Position (CPS) Sensor Signal

11

PU

1272

Low Reference

12

GY

1273

Low Reference

13

D-GN

2362

CAN Serial Data Low

14

--

--

Not Used

15

BK/WH

851

Ground

16

BK/WH

51

Ground

17

BK

407

Low Reference

18

--

--

Not Used

19

L-GN/BK

2670

Sensor Signal 2

20

BK/WH

751

Ground

21

L-BU

1162

APP Sensor 2 Signal

22

D-GN

1163

APP Sensor 3 Signal

23

YE

1578

Fuel Temperature Signal

24

BK

470

Low Reference

25

--

--

Not Used

26

PU

719

Low Reference

27

WH

1533

Turbo Boost Pressure Sensor - Signal

28

L-GN

36

Coolant Temperature Signal

Engine Control Module (ECM) C5


Object Number: 854609  Size: CH

Connector Part Information

    • 15316524
    • 22-Way F (WH)

Pin

Wire Color

Circuit No.

Function

1

TN

887

Fuel Injector Current Sample Signal - Bank - 1 (LG4)

2-3

--

--

Not Used

4

YE

573

CKP Sensor [1]

5

PU

1589

Fuel Level Sensor Signal [- Primary]

6

D-BU

1936

Fuel Level Sensor Signal [- Secondary]

7

WH/BK

1164

5-Volt Reference

8

D-BU

888

Fuel Injector Current Sample Signal - Bank - 2

9

--

--

Not Used

10

PU

574

Low Reference

11

L-BU

2221

Signal High - Rear

12

D-GN

2222

Signal Low - Rear

13

--

--

Not Used

14

D-GN/WH

960

MAT Sensor Signal

15

--

--

Not Used

16

BK/WH

1251

Ground

17

TN/WH

332

Oil Pressure Sensor Signal

18

--

--

Not Used

19

D-BU

2364

Cooling Fan Speed Signal

20

GY

23

Generator Field Duty Cycle Signal

21

D-BU

1161

APP Sensor 1 Signal

22

BN

1271

Low Reference