GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 GMC C-Series Medium Duty Truck B7 🢒 Brakes 🢒 Antilock Brake System 🢒 Engine Controls Connector End Views
Table 1: Data Link Connector (DLC)
Table 2: Distributer Ignition Control Module C1
Table 3: EGR Electronic Vacuum Regulator Solenoid Valve
Table 4: Engine Control Module (ECM) C1
Table 5: Engine Control Module (ECM) C2
Table 6: Engine Coolant Temperature (ECT) Gauge Sensor
Table 7: Engine Oil Pressure (EOP) Gauge Sensor & Fuel Pump Switch
Table 8: Engine Speed Governor Module
Table 9: Engine Speed Governor Motor
Table 10: Fuel Sender and Fuel Pump
Table 11: Hi Idle Switch
Table 12: Idle Air Valve Control Valve
Table 13: Ignition Coil
Table 14: Knock Sensor
Table 15: Knock Sensor Module
Table 16: Manifold Absolute Pressure Sensor
Table 17: Multifunction Alarm Module (MFAM)
Table 18: Oxygen Sensor
Table 19: Speedo Adapter
Table 20: Stoplamps Switch C1
Table 21: Stoplamps Switch C2
Table 22: Throttle Body Fuel Injector 1
Table 23: Throttle Body Fuel Injector 2
Table 24: Throttle Position Sensor
Table 25: Vehicle Speed Sensor (VSS) (Automatic)
Table 26: Vehicle Speed Sensor (VSS) (Manual)

Data Link Connector (DLC)


Object Number: 68793 Size: CH

Connector Part Information
    • 12110250
    • 16 Way F Metri-Pack 150 Series, (BLK)

Pin

Wire Color

Circuit No.

Function

1

ORN

461

Serial Data Signal GMCM 160 Baud

2-3

--

--

Not Used

4

BLK

150

Ground

5

BLK/WHT

451

Engine Control Module Ground

6

WHT/BLK

448

Dignostic Enable Signal Power Train

7

--

--

Not Used

8-11

--

--

Not Used

12

TAN/WHT

799

Dignostic Signal ABS

13-14

--

--

Not Used

15

WHT/BLK

1922

Serial Data Link-B-SAE 1708

16

ORN

140

Fuse Output Battery Type III Fuse

Distributer Ignition Control Module C1


Object Number: 38608 Size: CH

Connector Part Information
    • 12162189
    • 4 Way F Metri-Pack 150.2 Series Pull to Seat, Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

RED/BLK

453

Electronic Spark Timing Low Reference Signal

B

TAN/BLK

424

Electronic Spark Timing Bypass Signal

C

PPL/WHT

430

Electronic Spark Timing High Reference Signal

D

WHT

423

Electronic Spark Timing Control Signal

EGR Electronic Vacuum Regulator Solenoid Valve


Object Number: 62443 Size: CH

Connector Part Information
    • 12047950
    • 4 Way F Metri-Pack 150 Series, Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

PNK

639

Fuse Output Ignition 1 Type III Fuse

B

GRY

1954

Exhaust Gas Recirculation Vacuum Regulator Valve Signal

C

--

--

Not Used

D

BLK/WHT

451

Engine Control Module Ground

Engine Control Module (ECM) C1


Object Number: 73221 Size: CH

Connector Part Information
    • 12045575
    • 32 Way F Micro-Pack 100 Series (BLK)

Pin

Wire Color

Circuit No.

Function

C1

--

--

Not Used

C2

RED

2013

High Idle Indicator Lamp Output

C3

LT GRN/BLK

444

Idle Air Control Valve Motor Feed-Coil B Low

C4

LT GRN/WHT

1749

Idle Air Control Valve Motor Feed-Coil B High

C5

LT BLU/WHT

1747

Idle Air Control Valve Motor Feed-Coil A High

C6

LT BLU/BLK

1748

Idle Air Control Valve Motor Feed-Coil A Low

C7

--

--

Not Used

C8

DK GRN

534

High Idle Switch Output

C9

ORN/BLK

434

Transmission Mounted Neutral Safty Switch Signal

C10

YEL

410

Coolant Temperature Sensor Signal

C11

LT GRN

432

Manifold Absolute Pressure Sensor Signal

C12

--

--

Not Used

C13

DK BLU

417

Throttle Position Sensor Signal

C14

GRA

416

Reference Voltage Feed-5volt Reference

C15

--

--

Not Used

C16

ORN

840

Fuse Output-Battery

D1

BLK/WHT

451

Engine Control Module Ground

D2

ORN/BLK

469

Manifold Absolute Pressure Sensor Return

D3

--

--

Not Used

D4

WHT

423

Electronic Spark Timing Control Signal

D5

TAN/BLK

424

Electronic Spark Timing Bypass Signal

D6

TAN

413

Oxygen Sensor Return

D7

PPL

412

Oxygen Sensor Signal

D8-D13

--

--

Not Used

D14

DK GRN

468

Fuel Injector Output-Bank B

D15

--

--

Not Used

D16

DK BLU

467

Fuel Injector Output-Bank A

Engine Control Module (ECM) C2


Object Number: 73144 Size: CH

Connector Part Information
    • 12047946
    • 24 Way F Micro-Pack 100 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A1

DK GRN/WHT

465

Fuel Pump Relay Feed-Coil

A2

DK BLU

1938

Engine Overspeed Indicator Lamp Output

A3

DK GRN

1474

Governor Module Signal

A4

GRA

1954

Exhaust Gas Recirculation Vacuum Regulator Valve Signal

A5

BRN/WHT

419

Check Engine Indicator Lamp Output

A6

PNK

39

Fuse Output-Ignition

A7

--

--

Not Used

A8

ORN

461

Serial Data Signal-GMCM-160 Baud

A9

WHT/BLK

448

Diagnostic Enable Signal-Powertrain

A10

RED

381

Vehicle Speed Signal-2000 Pulses Per Mile

A11

BLK

452

Sensor Return

A12

BLK/WHT

451

Engine Control Module Ground

B1

ORN

840

Fuse Output-Battery

B2

GRA

120

Fuel Pump Motor Feed

B3

RED/BLK

453

Electronic Spark Timing Low Reference Signal

B4

--

--

Not Used

B5

PPL/WHT

430

Electronic Spark Timing High Reference Signal

B6

--

--

Not Used

B7

ORN

406

Electronic Spark Timing Control Signal-B

B8

BLK/WHT

451

Engine Control Module Ground

B9

--

--

Not Used

B10

ORN/BLK

1786

Transmission Park/Neutral Signal

B11-B12

--

--

Not Used

Engine Coolant Temperature (ECT) Gauge Sensor


Object Number: 62485 Size: CH

Connector Part Information
    • 12078090
    • 3 Way F Metri-Pack 150 Series, Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

BLK

452

Sensor Return

B

YEL

410

Coolant Temperature Sensor Signal

C

DK GRN

135

Coolant Temperature Sensor Signal

Engine Oil Pressure (EOP) Gauge Sensor & Fuel Pump Switch


Object Number: 258230 Size: CH

Connector Part Information
    • 12065298
    • 4Way F Metri-Pack 150 Series

Pin

Wire Color

Circuit No.

Function

A

TAN/WHT

331

Oil Pressure Sensor Signal

B

BLK

150

Ground

C

ORN

740

Fuse Output-Battery

D

GRA

120

Fuel Pump Motor Feed

Engine Speed Governor Module


Object Number: 73212 Size: CH

Connector Part Information
    • 12059573
    • 6 Way F Metri-Pack 280 Series, Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

PNK

39

Fuse Output Ignitiion 1 Type III Fuse

B

LT GRN

147

Fuse Output Off/Run Type III Fuse

C

BLK/WHT

451

Engine Control Module Ground

D

DK BLU

1475

Governor Motor Feed

E

BRN

1476

Governor Motor Return

F

--

--

Not Used

Engine Speed Governor Motor


Object Number: 73213 Size: CH

Connector Part Information
    • 12059612
    • 3 Way F Metri-Pack 280 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

DK BLU

1475

Governor Motor Feed

B

--

--

Not Used

C

BRN

1476

Governor Motor Return

Fuel Sender and Fuel Pump


Object Number: 258300 Size: CH

Connector Part Information
    • 12160482
    • 4 Way F Metri-Pack 150 Series, Sealed, (BLK)

Pin

Wire Color

Circuit No.

Function

A

PPL

30

Fuel Gauge Sensor Signal

B

GRA

120

Fuel Pump Motor Feed

C

BLK

150

Ground

D

BLK

150

Ground

Hi Idle Switch


Object Number: 95782 Size: CH

Connector Part Information
    • 12052833
    • 2 Way M Metri-Pack 150 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

DK GRN

534

High Idle Switch Output

B

BLK/WHT

451

Engine Control Module Ground

Idle Air Valve Control Valve


Object Number: 38608 Size: CH

Connector Part Information
    • 12162189
    • 4 Way F Metri-Pack 150 Series, Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

LT GRN/BLK

444

Idle Air Control Valve Motor Feed Coil B Low

B

LT GRN/WHT

1749

Idle Air Control Valve Motor Feed Coil B High

C

LT BLU/BLK

1748

Idle Air Control Valve Motor Feed Coil A Low

D

LT BLU/WHT

1747

Idle Air Control Valve Motor Feed Coil A High

Ignition Coil


Object Number: 239975 Size: CH

Connector Part Information
    • 12040705
    • 2 Way M Metri-Pack 280 Series (GRY)

Pin

Wire Color

Circuit No.

Function

A

WHT

121

Tachometer Signal

B

PNK

39

Fuse Output Ignition 1 Type III Fuse

Knock Sensor


Object Number: 95764 Size: CH

Connector Part Information
    • 12176800
    • 1 Way F Metri-Pack 150 Series, Sealed (GRY)

Pin

Wire Color

Circuit No.

Function

A

DK BLU

496

Knock Sensor Signal #1

Knock Sensor Module


Object Number: 332028 Size: CH

Connector Part Information
    • 12015982
    • 4 Way F Metri-Pack 280 Series, Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

--

--

Not Used-Sealed

B

PNK

639

Fuse Output Ignition 1Type III Fuse

C

ORN

406

Electronic Spark Timing Control Signal B

D

BLK/WHT

251

Ground Clean

E

DK BLU

496

Knock Sensor Signal #1

Manifold Absolute Pressure Sensor


Object Number: 95766 Size: CH

Connector Part Information
    • 12020403
    • 3 Way M Weather Pack Sealed (DK GRN)

Pin

Wire Color

Circuit No.

Function

A

ORN/BLK

469

Manifold Absoulute Pressure Sensor Return

B

LT GRN

432

Manifold Absolute Pressure Sensor Signal

C

GRY

416

Reference Voltage Feed 5 Volt Referecne

Multifunction Alarm Module (MFAM)


Object Number: 73152 Size: CH

Connector Part Information
    • 12084944
    • 16 Way F Micro-Pack 100 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A1

LT BLU/BLK

1928

Brake Booster Fluid Flow Switch Feed

A2

YEL

53

Fuse Output-Generator-Tachometer Pulse

A3

RED

20

Stop Lamp Feed

A4

ORN/BLK

434

Transmission Mounted Neutral Safety Switch Signal

A5

PNK

39

Fuse Output-Ignition

A6

TAN/WHT

33

Brake Warning Indicator Lamp Output

A7

--

--

Not Used

A8

BLK

150

Ground

B1

BLK

150

Ground

B2

--

--

Not Used

B3

YEL/BLK

1471

Brake Warning Indicator Lamp Feed-Seconday

B4

GRA

847

Brake Pedal Switch Output-Extended Travel

B5

TAN/WHT

33

Brake Warning Indicator Lamp Output

B6

--

--

Not Used

B7

LT BLU

1377

Check Gauges Indicator Lamp Output

B8

ORN

1740

Fuse Output-Battery

Oxygen Sensor


Object Number: 309480 Size: CH

Connector Part Information
    • 12010501
    • 2 Way F (BLK)

Pin

Wire Color

Circuit No.

Function

A

TAN

413

Oxygen Sensor Return

B

PPL

412

Oxygen Sensor Signal

Speedo Adapter


Object Number: 73152 Size: CH

Connector Part Information
    • 12084945
    • 16 Way F Micro-Pack 100, Series (GRY)

Pin

Wire Color

Circuit No.

Function

A1

GRY/BLK

1467

Two Speed Rear Axle Shift Motor Relay Output Coil

A2-A8

--

--

Not Used

B1

PNK

39

Fuse Output Ignition 1 Type III Fuse

B2

PPL/WHT

821

Vehicle Speed Sensor Signal

B3

LT GRN/BLK

822

Vehicle Speed Sensor Return

B4

--

--

Not Used

B5

BLK/WHT

451

Engine Control Module Ground

B6

RED

381

Vehicle Speed Signal -2000 Pulses Per Mile

B7

--

--

Not Used

B8

DK GRN

389

Vehicle Speed Signal -4000 Pulses Per Mile

Stoplamps Switch C1


Object Number: 130679 Size: CH

Connector Part Information
    • 12033704
    • 4 Way F Metri-Pack 280 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

ORN

640

Fuse Output Battery Type III Fuse

B

RED

20

Stop Lamp Feed

C

ORN

540

Fuse Output Battery Type III Fuse

D

GRY

847

Brake Pedal Switch Output Extended Travel

Stoplamps Switch C2


Object Number: 333038 Size: CH

Connector Part Information
    • 12033709
    • 2 Way F Metri-Pack 280 Series, (BLK)

Pin

Wire Color

Circuit No.

Function

A

BLK/WHT

451

Engine Control Module Ground

B

TAN

848

Brake Pedal Switch Signal ABS

Throttle Body Fuel Injector 1


Object Number: 68721 Size: CH

Connector Part Information
    • 12162217
    • 2 Way F Metri-Pack 150 Series, Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

PNK

639

Fuse Output Igntion 1 Type III Fuse

B

DK BLU

467

Fuel Injector Output Bank A

Throttle Body Fuel Injector 2


Object Number: 68721 Size: CH

Connector Part Information
    • 12162217
    • 2 Way F Metri-Pack 150 Series, Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

PNK

639

Fuse OUtput Ignition 1 Type III Fuse

B

DK GRN

468

Fuel Injector Output Bank B

Throttle Position Sensor


Object Number: 62485 Size: CH

Connector Part Information
    • 12078090
    • 3 Way F Metri-Pack 150 Series, Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

GRY

416

Reference Volatage Feed 5 Volt Reference

B

BLK

452

Sensor Return

C

DK BLU

417

Throttle Position Sensor Signal

Vehicle Speed Sensor (VSS) (Automatic)


Object Number: 35437 Size: CH

Connector Part Information
    • 12052644
    • 2 Way F Metri-Pack 150 Series, Sealed (GRY)

Pin

Wire Color

Circuit No.

Function

A

PPL/WHT

821

Vehicle Speed Sensor Signal

B

LT GRN/BLK

822

Vehicle Speed Sensor Return

Vehicle Speed Sensor (VSS) (Manual)


Object Number: 68719 Size: CH

Connector Part Information
    • 12162194
    • 2 Way Metri-Pack 150 Series, Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

PPL/WHT

821

Vehicle Speed Sensor Signal

B

LT GRN

822

Vehicle Speed Sensor Return