GM Service Manual Online
For 1990-2009 cars only

ECU Connector C001


Object Number: 39787  Size: CH

Connector Part Information

    • 12129025
    • 32-Way F Micro-Pack Sealed 100 W Series (BLU)

Pin

Wire Color

Circuit No.

Function

1

PPL

412

Pre-Converter O2S 1 Signal

2

TAN

413

Pre-Converter O2S 1 Low

3-8

--

--

Not Used

9

GRY

474

5 Volt Reference

10

BLK/WHT

1704

MAP Sensor Ground

11-12

--

--

Not Used

13

BRN

1456

EGR Pintle Position Signal

14

DK BLU

417

TP Sensor Signal

15

YEL

410

ECT Sensor Signal

16

PPL

929

CNG Fuel Temperature Sensor (FTS) Signal

17

TAN

909

Not Used

18

GRY

932

CNG Fuel Pressure Sensor (FPS) Signal

19

TAN

472

IAT Sensor Signal

20

LT GRN

432

MAP Sensor Signal

21

ORN

140

Battery Power (12 V)

22

BLK

450

ECU Ground

23

BLK

450

ECU Ground

24

BLK

450

ECU Ground

25

--

--

Not Used

26

PNK

439

Ignition Positive Voltage (0)

27

BRN

912

Fuel Gauge Selector Switch Input

28

LT BRN

913

High Pressure Lock-off (HPL) Solenoid Ground

29

--

--

Not Used

30

LT BLU

901

Low Pressure Lock-off (LPL) Solenoid Ground

31

--

--

Not Used

32

TAN/WHT

928

Fuel Gauge Driver (ECU)

ECU Connector C002


Object Number: 39787  Size: CH

Connector Part Information

    • 12129025
    • 32- Way F Micro-Pack Sealed 100 W Series (RED)

Pin

Wire Color

Circuit No.

Function

1-6

--

--

Not Used

7

DK GRN

923

Serial Connector

8

WHT

924

Serial Connector

9-13

--

--

Not Used

14

DK BLU

911

Desired Gas Flow

15

GRY

903

Engine Sync/Baro

16

DK GRN/WHT

428

EVAP Canister Purge Valve Driver

17

GRY

904

Fuel Gauge Relay Control

18

PPL

914

Fuel Indicator Light Control

19-20

--

--

Not Used

21

BRN

905

AF Fuel Pump Relay Control

22

PNK

902

Natural Gas Operation (NGO) Enable

23

BRN

919

MIL Control (ECU)

24-27

--

--

Not Used

28

BLK

925

Serial Connector

29

RED

926

Serial Connector

30-32

--

--

Not Used

ECU Connector C003


Object Number: 39787  Size: CH

Connector Part Information

    • 12129025
    • 32-Way F Micro-Pack Sealed 100 W Series (CLR)

Pin

Wire Color

Circuit No.

Function

1

LT BLU/WHT

1747

IAC Coil A High

2

LT BLU/BLK

1748

IAC Coil A Low

3

LT GRN/WHT

1749

IAC Coil B High

4

LT GRN/BLK

444

IAC Coil B Low

5

BRN/WHT

419

MIL Control (PCM)

6

DK GRN

906

Not Used

7-13

--

--

Not Used

14

PNK

907

Actual Gas Flow

15

BRN/WHT

633

CMP Sensor Signal

16

PPL/WHT

430

CKP 7X Reference Signal

17

DK GRN/WHT

428

EVAP Canister Purge Valve Driver

18-19

--

--

Not Used

20

DK GRN/WHT

817

VSS Output Signal

21

PNK

1020

Ignition Positive Voltage (1)

22-27

--

--

Not Used

28

BLK

930

CNG Fuel Pressure Sensor (FPS) Return

29

ORN

931

CNG Fuel Pressure Sensor (FPS) 5 V Reference

30

BLK

933

Not Used

31

DK BLU

934

Not Used

32

RED

935

Not Used