GM Service Manual Online
For 1990-2009 cars only
Table 1: Engine Control Module (ECM) A (HV-240)
Table 2: Engine Control Module (ECM) B (HV-240)
Table 3: Engine Control Module (ECM) K (MR-140)
Table 4: Engine Control Module (ECM) M (MR-140)

Engine Control Module (ECM) A (HV-240)


Object Number: 1481265  Size: CF

Connector Part Information

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

Pin

Wire Color

Circuit Number

Function

1

BK/WH

51

Ground

2

BK/WH

51

Ground

3

YE/BK

496

Knock Sensor Signal

4

D-GN

411

Exhaust Gas Recirculation (EGR) Valve Control

5

--

--

Not Used

6

YE/BK

1868

Low Reference

7

GY

417

Throttle Position (TP) Sensor Signal

8

D-GN/BK

1746

Fuel Injector 3 Control

9

YE/D-BU

1744

Fuel Injector 1 Control

10

BK/WH

252

Low Reference

11

L-GN

410

Engine Coolant Temperature (ECT) Sensor Signal

12

D-GN/RD

1665

Oxygen (O2) Sensor 1 Low Reference (Unleaded Only)

13

PU/WH

1749

Idle Air Control (IAC) Coil B High Control

14

--

--

Not Used

15

D-GN/WH

416

5-Volt Reference

16

OG/BK

469

Low Reference

17

BK/WH

51

Ground

18

L-BU

406

Ignition Coil (IC) 1 and 4 Control

19

D-GN/WH

423

Ignition Coil (IC) 2 and 3 Control

20

WH

428

Evaporative Emissions (EVAP) Canister Purge Solenoid Control

21

D-BU/WH

1869

Crankshaft Position (CKP) Sensor Signal

22

BN/WH

1745

Fuel Injector 2 Control

23

GY

472

Intake Air Temperature (IAT) Sensor 5-Volt Reference

24

D-BU/WH

432

Manifold Absolute Pressure (MAP) Sensor Signal

25

PU

633

Camshaft Position (CMP) Sensor Signal

26

D-GN/WH

844

Injector 4 Signal

27

GY

1653

Oxygen (O2) Sensor 1 Signal (Unleaded Only)

28

BN

1747

Idle Air Control (IAC) Coil A High Control

29

WH

444

Idle Air Control (IAC) B Low Control

30

YE/WH

1748

Idle Air Control (IAC) A Low Control

31

BN/BK

1688

5-Volt Reference Voltage

32

D-BU/WH

808

Low Reference

Engine Control Module (ECM) B (HV-240)


Object Number: 1468388  Size: CF

Connector Part Information

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

Pin

Wire Color

Circuit Number

Function

1

PU/WH

632

Low Reference

2

OG

440

Battery Positive Voltage

3

PK/D-BU

539

Ignition 1 Voltage

4-6

--

--

Not Used

7

L-BU

380

A/C Refrigerant Pressure (ACP) Sensor Signal

8

L-BU

722

Octane Switch Signal

9

GY

121

Engine Speed Signal

10

D-GN/WH

762

A/C Request Signal

11

--

--

Not Used

12

D-BU

473

High Speed Cooling Fan Relay Control

13

--

--

Not Used

14

PU

1807

CAN Serial Data High

15

PU

2000

Keyword Serial Data

16

--

--

Not Used

17

GY

605

5-Volt Reference

18

OG

440

Battery Positive Voltage

19

GY

1936

Fuel Gage

20-21

--

--

Not Used

22

PU

723

Octane Switch Signal

23

D-GN/WH

817

Vehicle Speed Signal (Manual Transmission)

24

D-GN

135

Engine Coolant (ECT) Sensor Gage Signal

25

--

--

Not Used

26

L-GN

465

Fuel Pump Relay Control

27

D-GN/WH

335

Low Speed Cooling Fan Relay Control

28

D-GN

67

A/C Compressor Clutch Coil Supply Voltage

29

--

--

Not Used

30

YE

710

CAN Serial Data Low

31

WH

30

Fuel Level Sensor Signal

32

BN/WH

419

Malfunction Indicator Lamp (MIL) Control

Engine Control Module (ECM) K (MR-140)


Object Number: 1466972  Size: CF

Connector Part Information

    • AMP 0-368434-2
    • 64-Way F ECU 64P Conn Ass'y (32-bit-B)

Pin

Wire Color

Circuit Number

Function

1

OG

440

Battery Positive Voltage

2-4

--

--

Not Used

5

BK/WH

51

Ground

6

D-GN/WH

817

Vehicle Speed Signal (Manual Transmission)

7

D-BU

876

Rough Road Signal - W/ABS

8-11

--

--

Not Used

12

D-BU

473

High Speed Cooling Fan Relay Control

13

--

--

Not Used

14

PU

1807

CAN Serial Data High

15

YE

710

CAN Serial Data Low

16

BN/WH

1669

Heated Oxygen Sensor (HO2S) 1 Heater Control

17

OG

440

Battery Positive Voltage

18

PK/BU

539

Ignition 1 Voltage

19-20

--

--

Not Used

21

D-GN

602

Rough Road Sensor Signal

22

L-BU

380

A/C Refrigerant Pressure (ACP) Sensor Signal

23

--

--

Not Used

24

D-GN

135

Engine Coolant Temperature (ECT) Sensor Gage Signal

25

GY

121

Engine Speed Signal

26-27

--

--

Not Used

28

D-GN/WH

335

Low Speed Cooling Fan Relay Control

29

D-GN

67

A/C Compressor Clutch Coil Supply Voltage

30

WH

30

Fuel Level Sensor Signal

31

--

--

Not Used

32

PU

2000

Keyword Serial Data

33

--

--

Not Used

34

PU/WH

632

Low Reference

35

D-GN/WH

762

A/C Request Signal

36

PU

1670

Heated Oxygen Sensor (HO2S) 2 Signal

37-49

--

--

Not Used

50

GY

605

5-Volt Reference

51

GY

1936

Fuel Level Sensor Signal

52

YE/D-GN

890

Fuel Tank Pressure Sensor Signal

53

L-GN

413

Heated Oxygen Sensor (HO2S) 2 Low Reference

54

L-GN

465

Fuel Pump Relay Control

55-63

--

--

Not Used

64

BN/WH

419

Mulfunction Indicator Lamp (MIL) Control

Engine Control Module (ECM) M (MR-140)


Object Number: 1501851  Size: CF

Connector Part Information

    • AMP 1-368434-1
    • 64-Way F ECU 64P Conn Ass'y (32-bit-B)

Pin

Wire Color

Circuit Number

Function

1

L-BU

406

Ignition Coil (IC) Timing Control 1 and 4

2

BN/BK

1671

Heated Oxygen Sensor (HO2S) 2 Heater Control

3

GY

120

Fuel Pump Supply Voltage

4

WH

428

Evaporative Emissions (EVAP) Canister Purge Solenoid Control

5

YE/BK

1868

Low Reference

6

GY

417

Throttle Position (TP) Sensor Signal

7

GY

472

Intake Air Temperature (IAT) Sensor Signal

8

D-BU/WH

432

Manifold Absolute Pressure (MAP) Sensor Signal

9

WH/BK

1456

Exhaust Gas Recirculation (EGR) Valve Position Signal

10

--

--

Not Used

11

D-GN/WH

844

Fuel Injector 4 Control

12

GY

1653

Heated Oxygen Sensor (HO2S) 1 Signal

13

BN

1747

Idle Air Control (IAC) A High Control

14

WH

444

Idle Air Control (IAC) B Low Control

15

YE/WH

1748

Idle Air Control (IAC) A Low Control

16

L-BU/BK

1688

5-Volt Reference

17

--

--

Not Used

18

YE/BK

496

Knock Sensor Signal

19

D-GN

435

Exhaust Gas Recirculation (EGR) Solenoid Low Control

20

--

--

Not Used

21

D-BU/WH

1869

Crankshaft Position (CKP) Sensor Signal

22

BN/WH

1745

Fuel Injector 2 Control

23

--

--

Not Used

24

D-GN/BK

1746

Fuel Injector 3 Control

25

YE/D-BU

1744

Fuel Injector 1 Control

26

PU

633

Camshaft Position (CMP) Sensor Signal

27

--

--

Not Used

28

L-GN

410

Engine Coolant Temperature (ECT) Sensor Signal

29

D-GN/RD

1665

Heated Oxygen Sensor (HO2S) 1 Low Reference

30

PU/WH

1749

Idle Air Control (IAC) Coil B High Control

31

--

--

Not Used

32

D-GN/WH

416

5-Volt Reference

33

L-BU

406

Ignition Coil (IC) Timing Control (1 and 4)

34

--

--

Not Used

35

D-GN/WH

423

Ignition Coil (IC) Timing Control (2 and 3)

36

--

--

Not Used

37

BK/WH

51

Ground

38

BK/WH

51

Ground

39

BK/WH

51

Ground

40

BK/WH

51

Ground

41

BK/WH

51

Ground

42-47

--

--

Not Used

48

OG/BK

469

Low Reference

49-50

--

--

Not Used

51

D-GN/WH

423

Ignition Coil (IC) Timing Control (2 and 3)

52

D-GN

435

Exhaust Gas Recirulation (EGR) Low Control

53-63

--

--

Not Used

64

BK

808

Low Reference