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

Engine Control Module (ECM) - A


Object Number: 1481265  Size: CF

Connector Part Information

    • PED 12129231
    • 32-Way Retainer Lock (BK)

Pin

Wire Color

Circuit No.

Function

1

BK/WH

51

Ground

2

BK/WH

51

Ground

3

L-BU

496

Knock Sensor (KS) Signal

4-5

--

--

Not Used

6

YE/BK

1868

Crankshaft Position (CKP) Sensor Signal

7

WH

425

Throttle Position (TP) Sensor Signal

8

BN/WH

1745

Injector 3 Control

9

BN/BK

1747

Injector 1 Control

10

L-BU

52

Camshaft Position (CMP) Sensor Return

11

L-GN

410

Engine Coolant (ECT) Temperature

12

D-BU/BK

429

Oxygen Sensor (O2) Low Reference

13

L-GN

417

Idle Air Control (IAC) B High Control

14

--

--

Not Used

15

PU

427

5-Volt Reference

16

BN

732

EVAP Canister Vent Solenoid Control

17

BK/WH

51

Ground

18

OG

423

Ignition Coil 2 and 3 Control

19

WH

406

Ignition Coil 1 and 4 Control

20

WH

452

EVAP Canister Purge Valve Solenoid Control

21

D-BU/WH

1869

Low Reference

22

L-GN

1746

Fuel Injector 2 Control

23

L-BU

468

Intake Air Temperature (IAT) Sensor Signal

24

L-BU

432

Manifold Absolute Pressure (MAP) Sensor Signal

25

L-BU/BK

1748

Camshaft Position (CMP) Sensor Signal

26

YE

1744

Injector 4 Control

27

WH

428

Oxygen Sensor (O2) Signal

28

L-GN

534

Idle Air Control (IAC) A High Control

29

D-GN

415

Idle Air Control (IAC) B Low Control

30

WH/D-BU

533

Idle Air Control (IAC) A Low Control

31

L-BU

469

5-Volt Reference

32

D-BU/WH

1876

Low Reference

Engine Control Module (ECM) - B


Object Number: 1468388  Size: CF

Connector Part Information

    • PED 12129232
    • 32-Way Retainer Lock (CL)

Pin

Wire Color

Circuit No.

Function

1

L-BU

1937

Low Reference

2

OG

440

Battery Positive Voltage

3

PK

1739

Ignition 1 Voltage

4-6

--

--

Not Used

7

L-BU

203

A/C Pressure Sensor Signal

8

GY

892

Octane Selection Switch

9

GY

121

Engine Speed Signal

10

D-GN/WH

762

A/C Request Signal

11

BN/BK

821

Overspeed Warning Signal

12

GY

473

High Speed Cooling Fan Control

13

--

--

Not Used

14

PU

1807

CAN Serial Data High

15

BK/WH

2051

Keyword Serial Data

16-17

--

--

Not Used

18

OG

440

Battery Positive Voltage

19

GY

1936

Fuel Level Sensor Signal

20

--

--

Not Used

21

L-GN/OG

413

Low Reference

22

PU

890

Octane Selection Switch

23

D-GN

817

Vehicle Speed Sensor (VSS) Signal (Manual Transmission)

24

WH

135

Engine Coolant Temperature (ECT) Gage Control

25

--

--

Not Used

26

YE/D-BU

497

Fuel Pump Relay Control

27

GY

355

Low Speed Cooling Fan Relay Control

28

D-GN

67

A/C Clutch Relay Control

29

--

--

Not Used

30

YE

710

Can Serial Data Low (Automatic Transmission)

31

WH

30

Fuel Gage Control

32

BN

419

MIL Control