GM Service Manual Online
For 1990-2009 cars only

Engine Control Module (ECM)


Object Number: 1500001  Size: CF

Connector Part Information

    • 21 IPC 9025008
    • 90-Way F Connector (BK)

Pin

Wire Color

Circuit No.

Function

1-2

--

--

Not Used

3

BK/WH

251

Ground

4

--

--

Not Used

5

GY

435

Exhaust Gas Recirculation (EGR) Solenoid Low Control

6

D-GN/WH

465

Fuel Pump Relay Control

7

D-BU/WH

471

Main Relay Control

8

D-GN

135

Engine Coolant Temperature (ECT) Gage Signal

9

D-BU

473

High Speed - Cooling Fan Relay Control

10

D-GN

335

Low Speed - Cooling Fan Relay Control

11

BK/WH

51

Ground

12

D-BU/WH

1876

Low Reference

13

OG/BK

469

Low Reference

14

PU

1670

Heated Oxygen Sensor (HO2S) 2 Signal

15

--

--

Not Used

16

BN

413

Low Reference

17

L-GN

632

Low Reference

18

--

--

Not Used

19

BK/YE

808

Low Reference

20

L-BU

203

A/C Refrigerant Pressure Sensor Signal

21

D-BU

1936

Fuel Level Sensor Signal

22

BN/WH

633

Camshaft Position (CMP) Sensor Signal

23

--

--

Not Used

24

BK/WH

251

Ground

25

BK/WH

51

Ground

26

--

--

Not Used

27

L-BU

772

Octane Switch Signal (Non-OBD)

BK/WH

251

Ground (Euro Emissions)

28

BK/WH

251

Ground

29

PK

539

Ignition 1 Voltage

30

OG

440

Battery Positive Voltage

31

WH

423

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

32

OG

406

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

33

BK/WH

251

Ground

34

--

--

Not Used

35

BN/WH

1666

Heated Oxygen Sensor (HO2S) 1 Signal

36

--

--

Not Used

37

WH/BK

962

Intake Manifold Tuning Valve Solenoid Control

38

--

--

Not Used

39

BN/WH

419

Multifunction Indicator Lamp (MIL) Control

40

PU

30

Fuel Level Sensor Signal

41

PU

67

A/C Compressor Clutch Relay Coil Control Signal

42

YE/BK

496

Knock Sensor (KS) Signal

43

D-GN

534

High Idle Switch Signal

44

PU/WH

1665

Heated Oxygen Sensor (HO2S) 1 Low Reference (OBD)

O2 Sensor Signal (Non OBD)

45

BN

1456

Exhaust Gas Recirculation (EGR) Valve Position Signal

46

GY

605

5-Volt Reference

47-49

--

--

Not Used

50

L-BU/BK

1688

5-Volt Reference

51

D-GN/WH

817

Vehicle Speed Signal (Manual Transmission)

52

D-GN/WH

762

A/C Request Signal

53

WH

873

Rough Road Sensor Signal

D-BU

876

Rough Road Sensor Signal w/ABS

54

D-BU/WH

1869

Low Reference

55

PK

427

Idle Speed Control Motor Switch Signal

56

BN

2000

Keyword Serial Data

57

YE

710

CAN Serial Data Low (Automatic Transmission)

58

--

--

Not Used

59

BK

1744

Fuel Injector 1 Control

60

PK/BK

1746

Fuel Injector 3 Control

61

D-BU

426

Idle Motor Return

62

L-BU

425

Idle Motor Feed

63

--

--

Not Used

64

BN/WH

1671

Heated Oxygen Sensor (HO2S) 2 Heater Control

65

D-GN/WH

428

EVAP Canister Purge Solenoid Control

66

PK/BK

1846

Ignition 1 Voltage

67

BK/WH

251

Ground

68

WH

121

Engine Speed Signal

69

GY

435

Exhaust Gas Recirculation (EGR) Solenoid Low Control (Non OBD)

70-73

--

--

Not Used

74

D-BU

417

Throttle Position (TP) Sensor Signal

75

L-GN

432

Manifold Absolute Pressure (MAP) Sensor Signal

76

YE

410

Engine Coolant Temperature (ECT) Sensor Signal

77

--

--

Not Used

78

BN

472

Intake Air Temperature (IAT) Sensor Signal

79

GY

416

5-Volt Reference

80

--

--

Not Used

81

PU

773

Octane Switch Signal

82

--

--

Not Used

83

BN

990

Power Steering Pressure Switch Signal

84

OG

830

5-Volt Reference

85

YE/BK

1868

Crankshaft Position (CKP) Sensor Signal

86-87

--

--

Not Used

88

PU

1807

CAN Serial Data High

89

L-BU/BK

844

Fuel Injector 4 Control

90

L-GN/BK

1745

Fuel Injector 2 Control