GM Service Manual Online
For 1990-2009 cars only
Table 1: Engine Control Module (ECM) Connector C1
Table 2: Engine Control Module (ECM) Connector C2

Engine Control Module (ECM) Connector C1


Object Number: 651541  Size: CH

Connector Part Information

Engine Control Module Connector (C1)

PIN #

Wire Color

Function

1

BLK/WHT

Throttle Valve Motor (minus)

2

BRN/WHT

HO2S Bank 2 Sensor 2 Heater Control

3

BRN/BLU

Fuel Injector #3 Driver

4

BRN/GRN

Intake Plenum Switchover Valve Control

5

BRN/RED

EVAP Purge Solenoid Control Valve

6

BRN/GRN

KS Bank 2 Low

7

BRN/GRN

HO2S Bank 2 Sensor 2 Ground

8-9

--

Not Used

10

GRY/BLK

CKP Sensor Signal

11

BRN/RED

HO2S Bank 1 Sensor 1 Input Pumping Current

12

BRN/WHT

HO2S Bank 2 Sensor 1 Ground

13

--

Not Used

14

GRY/BLK

Ignition Control Cyl #5

15

BLK/YEL

Ignition Control Cyl #3

16

BLK/RED

Ignition Control Cyl #1

17

BRN/YEL

Throttle Valve Motor (plus)

18

BRN/GRY

HO2S Bank 2 Sensor 1 Heater Control

19

BRN/YEL

Fuel Injector #1 Driver

20

BRN/BLK

Fuel Injector #5 Driver

21

--

Not Used

22

BRN/WHT

KS Bank 1 Signal

23

BRN/BLU

HO2S Bank 1 Sensor 2 Signal

24

WHT

TP Sensor 1 Signal

25

BRN/BLU

ECT Sensor Signal

26

BRN/GRN

Sensor Ground (MAF/IAT, ECT, TP)

27

--

Not Used

28

BRN/BLU

HO2S Bank 1 Sensor 1 Signal

29

BRN/GRN

HO2S Bank 2 Sensor 1 Output Pumping Circuit

30

GRY/BLK

Ignition Control Cyl #6

31

BLK/YEL

Ignition Control Cyl #4

32

BLK/RED

Ignition Control Cyl #2

33

BLK/WHT

Throttle Valve Motor (minus)

34

BRN/WHT

HO2S Bank 1 Sensor 2 Heater Control

35

BRN/GRN

Fuel Injector #2 Driver

36

BRN/PPL

Fuel Injector #6 Driver

37

--

Not Used

38

BRN/WHT

KS Bank 2 Signal

39

BRN/BLU

HO2S Bank 2 Sensor 2 Signal

40

BRN/BLU

TP Sensor 2 Signal

41

--

Not Used

42

WHT

CMP Sensor Signal

43

BRN/GRN

HO2S Bank 1 Sensor 1 Output Pumping Circuit

44

BRN/BLU

HO2S Bank 2 Sensor 1 Signal

45-48

--

Not Used

49

BRN/YEL

Throttle Valve Motor (plus)

50

BRN/GRY

HO2S Bank 1 Sensor 1 Heater Control

51

BLU/BLK

MAF 5 Volt Reference

52

BRN/RED

Fuel Injector #4 Driver

53

BRN/GRN

Intake Resonance Switchover Valve Control

54

BRN/GRN

KS Bank 1 Low

55

BRN/GRN

HO2S Bank 1 Sensor 2 Ground

56

GRY/RED

MAF Signal

57

BRN/BLK

IAT Sensor Signal

58

BLU/BLK

TP Sensor 5 Volt Reference

59

GRY/RED

CKP Reference Low

60

BRN/WHT

HO2S Bank 1 Sensor 1 Ground

61

BRN/RED

HO2S Bank 2 Sensor 1 Input Pumping Current

62

BLK

KS 1, KS 2, and CKP Sensor Shielded Ground

63-64

--

Not Used

Engine Control Module (ECM) Connector C2


Object Number: 371569  Size: CH

Connector Part Information

Engine Control Module Connector

Pin

Wire Color

Function

1

BRN/WHT

Cruise Indicator

2-5

--

Not Used

6

BLK/BLU

A/C ON/OFF Signal

7

BLK/RED

APP 2 5 Volt Reference

8

BRN/BLK

APP 1 Signal

9

--

Not Used

10

BLK/BRN

Cruise ON/OFF Signal

11

--

Not Used

12

BRN/GRY

EBTCM CAN Interface Low

13

BRN/PPL

A/C Relay Control

14

--

Not Used

15

RED

B+

16

RED/BLU

Switched B+

17

--

Not Used

18

BRN/BLK

EVAP Vent Solenoid Control

19-21

--

Not Used

22

BLU/BLK

Fuel Level Input

23

--

Not Used

24

BRN/GRY

APP 1 Reference Ground

25

BRN/GRN

Fuel Tank Pressure Sensor Ground

26

BLK/BRN

Cruise Release Signal

27

BLK/YEL

Stop Lamp Signal

28

--

Not Used

29

BRN/PPL

EBTCM CAN Interface High

30

BRN/BLU

Fuel Pump Relay Control

31

BRN/GRY

Engine Controls Power Relay Control

32

RED/BLU

Switched B+

33

GRY

Filler Cap Lamp

34

BRN/YEL

Secondary Air Pump Solenoid Control

35

GRN

RPM Signal Output

36

--

Not Used

37

BRN/YEL

Fuel Tank Pressure Sensor Signal

38-39

--

Not Used

40

BRN/RED

APP 2 Signal

41

--

Not Used

42

BLK/RED

Cruise Resume/Decel Signal

43

BLK/YEL

Cruise Set/Accel Signal

44

BLU/RED

VSS/Theft Deterrent Signal

45

BRN/PPL

TCM CAN Interface High

46

BRN/BLU

MIL Control

47

BRN

Ignition Switch

48

RED/BLU

Switched B+

49-52

--

Not Used

53

BRN/WHT

Serial Data/kw 2000/DLC

54-55

--

Not Used

56

BLK/GRY

APP 1 5 Volt Reference

57

--

Not Used

58

BLK/WHT

A/C Request

59-60

--

Not Used

61

BRN/GRY

TCM CAN Interface Low

62

BRN/GRY

Secondary Air Pump Relay Control

63

BLU/BLK

Fuel Tank Pressure Sensor 5 Volt

64

--

Not Used