GM Service Manual Online
For 1990-2009 cars only
Table 1: Engine Controls Module (ECM) - (ITMS-6F) - A-B
Table 2: Engine Controls Module (ECM) - (ITMS-6F) - C-D
Table 3: Engine Controls Module (ECM) - (MR-140) - K
Table 4: Engine Controls Module (ECM) - (MR-140) - M

Engine Controls Module (ECM) - (ITMS-6F) - A-B


Object Number: 258912  Size: CH

Connector Part Information

    • AK 37006
    • 32-Way F Micro-Pack 100 Series (RD)

Pin

Wire Color

Circuit Number

Function

A1

BN

1747

Idle Air Control (IAC) Coil A High Control

A2

YE/BN

1748

Idle Air Control (IAC) Coil A Low Control

A3

WH

444

Idle Air Control (IAC) Coil B Low Control

A4

PU

1749

Idle Air Control (IAC) Coil B High Control

A5

--

--

Not Used

A6

OG/BK

240

Battery Positive Voltage

A7

L-BU

432

Manifold Absolute Pressure (MAP) Sensor Signal

A8

YE/D-GN

762

A/C Request Signal

A9

D-BU/YE

411

TP Sensor Signal

A10

D-GN/WH

335

Low Speed Cooling Fan Relay Control

A11

--

--

Not Used

A12

L-GN

465

Fuel Pump Relay Control

A13

WH

428

EVAP Canister Purge Solenoid Control

A14

GY

473

High Speed Cooling Fan Relay Control

A15

D-GN

67

A/C Compressor Clutch Coil Supply Voltage

A16

D-BU/WH

1868

Low Reference

B1

BK/WH

51

Ground

B2

D-GN

808

Low Reference

B3

L-GN

410

Engine Coolant Temperature (ECT) Sensor Signal

B4

GY

472

Intake Air Temperature (IAT) Sensor Signal

B5-B7

--

--

Not Used

B8

BN/BK

1786

Transmission Park/Neutral Signal 1

B9

D-BU

448

Serial Data

B10

BN/WH

419

Malfunction Indicator Lamp (MIL) Control

B11

--

--

Not Used

B12

WH/YE

433

Delivered Torque Signal

B13

D-GN/RD

121

Engine Speed Signal

D-GN/RD

121

Engine Speed Signal

B14

YE/BK

1869

Crankshaft Position (CKP) Sensor Signal

B15-B16

--

--

Not Used

Engine Controls Module (ECM) - (ITMS-6F) - C-D


Object Number: 1501865  Size: CH

Connector Part Information

    • AK 37007
    • 32-Way F Micro-Pack 100 Series (WH)

Pin

Wire Color

Circuit Number

Function

C1-C3

--

--

Not Used

C4

YE/D-BU

1744

Fuel Injector 1 and 4 Control

C5

--

--

Not Used

C6

BN/WH

1745

Fuel Injector 2 and 3 Control

C7

BK/WH

51

Ground

C8

--

--

Not Used

C9

D-GN/YE

1653

Oxygen Sensor (O2) Low Reference

C10

WH

422

Requested Torque Signal

C11

YE/BK

496

Knock Sensor (KS) Signal

C12

--

--

Not Used

C13

PU

723

Octane Switch Signal

C14

D-GN/WH

423

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

C15

L-BU/BK

380

A/C Refrigerant Pressure Sensor Signal

C16

PK/BN

539

Ignition 1 Voltage

D1

--

--

Not Used

D2

WH/BK

993

CO Potentiometer Signal - Leaded Fuel

D3-D4

--

--

Not Used

D5

L-GN/RD

417

TP Sensor Signal

D6

L-BU

722

Octane Switch Signal

D7

BK/WH

51

Ground

D8

BN/BK

1688

5-Volt Reference

D9

D-GN/RD

1665

Oxygen Sensor Signal

D10

BN/WH

817

Vehicle Speed Signal (Manual Transmission)

BN/WH

817

Vehicle Speed Signal (Manual Transmission)

D11

D-BU/RD

1061

Serial Data

D12-D13

--

--

Not Used

D14

L-BU

406

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

D15

D-BU/WH

469

Low Reference

D-BU/WH

469

Low Reference (w/Octane Selection Switch)

D16

BK/WH

51

Ground

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


Object Number: 1481262  Size: CF

Connector Part Information

    • AMP 0-368434-1
    • 64-Way F ECU 64P Conn Ass'y (32-bit-B) (BK)

Pin

Wire Color

Circuit Number

Function

K1

OG/BK

240

Battery Positive Voltage

K2

BN/BK

1786

Transmission Park Neutral Signal 1 (w/Automatic Transmission)

K3-K5

--

--

Not Used

K6

BN/BK

817

Vehicle Speed Signal (Manual Transmission)

K7

WH

834

Rough Road Signal (w/ABS)

K8-K10

--

--

Not Used

K11

D-GN/RD

35

Temperature Warning Lamp

K12

GY

473

High Speed Cooling Fan Relay Control

K13

--

--

Not Used

K14

D-GN

2148

CAN Serial Data High (w/Automatic Transmission)

K15

BN

2149

CAN Serial Data Low (w/Automatic Transmission)

K16

WH

30

Fuel Level Sensor Signal

K17

OG/BK

240

Battery Positive Voltage

K18

BN

539

Ignition 1 Voltage

K19

D-BU

448

Serial Data

K20

--

--

Not Used

K21

D-GN

602

Rough Road Sensor Signal (w/out ABS)

K22

L-BU

380

A/C Refrigerant Pressure Sensor Signal

K23-K24

--

--

Not Used

K25

GY

121

Engine Speed Signal

K26-K27

--

--

Not Used

K28

D-GN/WH

335

Low Speed Cooling Fan Low Relay Control

K29

D-GN

67

A/C Compressor Clutch Coil Supply Voltage

K30-K31

--

--

Not Used

K32

L-GN

2152

Serial Data

K33

--

--

Not Used

K34

YE/BN

632

Low Reference

K35

YE/D-GN

762

A/C Request Signal

K36

D-GN/BK

1670

Heated Oxygen Sensor (HO2S) 2 Signal

K37-K49

--

--

Not Used

K50

D-GN/D-BU

705

5-Volt Reference

K51

GY

1936

Fuel Level Sensor Signal

K52

--

--

Not Used

K53

BN/WH

1671

Heated Oxygen Sensor (HO2S) 2 Low Reference

K54

L-GN

465

Fuel Pump Relay Control

K55-K63

--

--

Not Used

K64

YE

2158

MIL Control

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


Object Number: 1466972  Size: CF

Connector Part Information

    • AMP 1-368434-2
    • 64-Way F ECU 64P Conn Ass'y (32-bit-B) (BN)

Pin

Wire Color

Circuit Number

Function

M1

L-BU

406

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

M2

L-GN

413

Heated Oxygen Sensor (HO2S) 2 Heater Control

M3

D-BU

120

Fuel Pump Supply Voltage

M4

WH

428

EVAP Canister Purge Solenoid Control

M5

D-BU/WH

1868

Low Reference

M6

L-GN/PK

417

Throttle Position (TP) Sensor Signal

M7

GY

472

Intake Air Temperature (IAT) Sensor Signal

M8

D-BU/WH

432

Manifold Absolute Pressure (MAP) Sensor Signal

M9

WH/BK

1456

Exhaust Gas Recirculation (EGR) Valve Position Signal

M10

--

--

Not Used

M11

D-GN/WH

844

Fuel Injector 4 Control

M12

GY

1653

Oxygen Sensor (O2) Signal (Low Reference)

M13

BN

1747

Idle Air Control Coil (IAC) A High Control

M14

WH

444

Idle Air Control Coil (IAC) B Low Control

M15

YE/WH

1748

Idle Air Control Coil (IAC) A Low Control

M16

BN/BK

1688

5-Volt Reference

M17

--

--

Not Used

M18

YE/BK

496

Knock Sensor (KS) Signal

M19

D-GN

435

Exhaust Gas Recirculation (EGR) Solenoid Low Control

M20

--

--

Not Used

M21

YE/BK

1869

Crankshaft Position Sensor (CKP) Signal

M22

BN/WH

1745

Fuel Injector 2 Control

M23

--

--

Not Used

M24

L-GN/BK

1746

Fuel Injector 3 Control

M25

YE/D-BU

1744

Fuel Injector 1 Control

M26

BN

633

Camshaft Position (CMP) Sensor Signal

M27

--

--

Not Used

M28

L-GN

410

Engine Coolant Temperature (ECT) Sensor Signal

M29

D-GN

1665

Oxygen Sensor (O2) Low Reference (Signal)

M30

PU/WH

1749

Idle Air Control (IAC) Coil B High Control

M31

--

--

Not Used

M32

D-GN/WH

416

5-Volt Reference

M33

L-BU

406

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

M34

--

--

Not Used

M35

D-GN/WH

423

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

M36

--

--

Not Used

M37

BK/WH

51

Ground

M38

BK/WH

51

Ground

M39

BK/WH

51

Ground

M40

BK/WH

51

Ground

M41

BK/WH

51

Ground

M42-M47

--

--

Not Used

M48

L-BU

469

Low Reference

M49-M50

--

--

Not Used

M51

D-GN/WH

423

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

M52

D-GN

435

Exhaust Gas Recirculation (EGR) Solenoid Low Control

M53-M63

--

--

Not Used

M64

D-GN

808

Low Reference