GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC P42 Commercial Chassis 🢒 Body and Accessories 🢒 Data Link Communications 🢒 Engine Controls Connector End Views

Engine Controls Connector End Views L57 EFI

Table 1: Accelerator Pedal Position (APP) Module
Table 2: Clutch Pedal Position (CPP) Switch
Table 3: Crankshaft Position (CKP) Sensor
Table 4: Engine Coolant Temperature (ECT) Sensor
Table 5: Engine Shut Off (ESO) Solenoid
Table 6: Fuel Heater
Table 7: Fuel Lift Pump
Table 8: Fuel Pump Relay
Table 9: Fuel Sender
Table 10: Fuel Solenoid Driver
Table 11: Glow Plug Controller
Table 12: Glow Plug Controller C1
Table 13: Glow Plug Controller C2
Table 14: Glow Plug Controller C3
Table 15: Injection Timing Stepper Motor
Table 16: Intake Air Temperature (IAT) Sensor
Table 17: Manifold Absolute Pressure Sensor
Table 18: Optical Fuel Temperature Sensor
Table 19: Park/Neutral Position (PNP) and Backup Lamps Switch C1
Table 20: Park/Neutral Position (PNP) and Backup Lamps Switch C2
Table 21: Transmission Input Speed Sensor (TISS)
Table 22: Transmission Output Speed Sensor (TOSS)
Table 23: Vehicle Speed Sensor (VSS)
Table 24: Vehicle Speed Sensor Calibrator
Table 25: Water In Fuel Indicator Sensor

Accelerator Pedal Position (APP) Module


Object Number: 280766 Size: CH

Connector Part Information
    • 12065425
    • 10 Way F Metri-Pack 150 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

BRN

1271

Electronic Throttle-Pedal Position Return 1

B

PPL

1272

Electronic Throttle-Pedal Position Return 2

C

LT BLU

1162

Electronic Throttle-Pedal Position Signal 2

D

TAN

1274

Electronic Throttle-Pedal Position 5V Ref 2

E

YEL/BLK

1275

Electronic Throttle-Pedal Position 5V Ref 3

F

DK BLU

1161

Electronic Throttle-Pedal Position Signal 1

G

WHT/BLK

1164

Electronic Throttle-Pedal Position 5V Ref 1

H

--

--

Not Used

J

GRY

1273

Electronic Throttle-Pedal Position Return 3

K

DK GRN

1163

Electronic Throttle-Pedal Position Signal 3

Clutch Pedal Position (CPP) Switch


Object Number: 39667 Size: CH

Connector Part Information
    • 12129136
    • 4 Way F Metri-Pack 280 Series, Flexlock (BLK)

Pin

Wire Color

Circuit No.

Function

A

DK BLU /WHT

805

Ignition Switch Output-Run/Heat/Crank

B

PPL

420

Brake Pedal Switch Output-Torque Converter Clutch

C

PPL

806

Fuse Output-Crank-Type III Fuse

D

BRN/WHT

379

Cruise Control Clutch Pedal Switch Output

Crankshaft Position (CKP) Sensor


Object Number: 68730 Size: CH

Connector Part Information
    • 12110293
    • 3 Way F Metri-Pack 150 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

YEL

573

Crankshaft Position Sensor Signal

B

PPL

574

Crankshaft Position Sensor Return

C

GRY

605

Reference Voltage Feed-5 Volt Reference

Engine Coolant Temperature (ECT) Sensor


Object Number: 232831 Size: CH

Connector Part Information
    • 12162195
    • 2 Way F Metri-Pack 150.2 Series P2S (BLK)

Pin

Wire Color

Circuit No.

Function

A

YEL

410

Coolant Temperature Sensor Signal

B

BLK

552

Sensor Return

Engine Shut Off (ESO) Solenoid


Object Number: 333039 Size: CH

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

Pin

Wire Color

Circuit No.

Function

A

DK BLU /WHT

259

Engine Shutoff Solenoid Output

B

PNK

339

Fuse Output-Ignition 1-Type III Fuse

Fuel Heater


Object Number: 295500 Size: CH

Connector Part Information
    • 12020397
    • 3 Way F Metri-Pack 280 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

BLK

550

Ground

B

--

--

Not Used

C

PNK

239

Fuse Output-Ignition 1-Type III Fuse

Fuel Lift Pump


Object Number: 38281 Size: CH

Connector Part Information
    • 12059473
    • 2 Way M Weather-Pack (BLK)

Pin

Wire Color

Circuit No.

Function

A

BLK

150

Ground

B

GRY

120

Fuel Pump Motor Feed

Fuel Pump Relay


Object Number: 39685 Size: CH

Connector Part Information
    • 12110539
    • 5 Way F Metri-Pack 280 Series, Flexlock (BLK)

Pin

Wire Color

Circuit No.

Function

30

GRY

120

Fuel Pump Motor Feed

85

DK GRN /WHT

465

Fuel Pump Relay Feed-Coil

86

BLK

150

Ground

87

ORN

440

Fuse Output-Battery-Type III Fuse

87A

RED

490

Fuel Pump Relay Feed-N.C. Contact-Prime

Fuel Sender


Object Number: 258300 Size: CH

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

Pin

Wire Color

Circuit No.

Function

A

PPL

30

Fuel Gauge Sensor Signal

B-C

--

--

Not Used

D

BLK

150

Ground

Fuel Solenoid Driver


Object Number: 289326 Size: CH

Connector Part Information
    • 12186568
    • 4 Way F Metri-Pack 150 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

LT GRN

260

Fuel Solenoid Module Feed

B

BLK

491

Fuel Solenoid Return-Closure

C

PNK

339

Fuse Output-Ignition 1-Type III Fuse

D

RED

313

Fuel Solenoid Closure Signal

Glow Plug Controller


Object Number: 62433 Size: CH

Connector Part Information
    • 12045636
    • 4 Way F Metri-Pack 280 Series (GRY)

Pin

Wire Color

Circuit No.

Function

A

PNK

239

Fuse Output-Ignition 1-Type III Fuse

B

YEL

505

Glow Plug Relay Feed-Coil

C

BLK

550

Ground

D

--

--

Not Used

Glow Plug Controller C1


Object Number: 320619 Size: CH

Connector Part Information
    • 12162144
    • 4 Way F Metri-Pack 150 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

YEL

505

Glow Plug Relay Feed-Coil

B

BLK

550

Ground

C

LT BLU

506

Diagnostic Signal-Glow Plug

D

PNK

239

Fuse Output-Ignition 1-Type III Fuse

Glow Plug Controller C2


Object Number: 73229 Size: CH

Connector Part Information
    • 12129565
    • 4 Way F Metri-Pack 280 Series (GRY)

Pin

Wire Color

Circuit No.

Function

A

PPL

1581

Glow Plug Feed-#1

B

LT BLU

1583

Glow Plug Feed-#3

C

DK GRN

1585

Glow Plug Feed-#5

D

PNK

1587

Glow Plug Feed-#7

Glow Plug Controller C3


Object Number: 73229 Size: CH

Connector Part Information
    • 12129565
    • 4 Way F Metri-Pack 280 Series (GRY)

Pin

Wire Color

Circuit No.

Function

A

PPL/WHT

1582

Glow Plug Feed-#2

B

LT BLU /WHT

1584

Glow Plug Feed-#4

C

DK GRN /WHT

1586

Glow Plug Feed-#6

D

PNK/WHT

1588

Glow Plug Feed-#8

Injection Timing Stepper Motor


Object Number: 38608 Size: CH

Connector Part Information
    • 12162190
    • 4 Way F Metri-Pack 150.2 Series P2S (BLK)

Pin

Wire Color

Circuit No.

Function

A

TAN/BLK

1030

Injection Timing Stepper Motor Feed-Coil A-Low

B

ORN/BLK

1032

Injection Timing Stepper Motor Feed-Coil B-Low

C

YEL/BLK

1033

Injection Timing Stepper Motor Feed-Coil B-High

D

RED/BLK

1031

Injection Timing Stepper Motor Feed-Coil A-High

Intake Air Temperature (IAT) Sensor


Object Number: 68719 Size: CH

Connector Part Information
    • 12162199
    • 2 Way F Metri-Pack 150.2 Series P2S (GRY)

Pin

Wire Color

Circuit No.

Function

A

TAN

472

Manifold Absolute Temperature Sensor Signal

B

BLK

552

Sensor Return

Manifold Absolute Pressure Sensor


Object Number: 280779 Size: CH

Connector Part Information
    • 12103771
    • 3 Way M Weather-Pack (WHT)

Pin

Wire Color

Circuit No.

Function

A

BLK

552

Sensor Return

B

LT GRN

432

Manifold Absolute Pressure Sensor Signal

C

GRY

605

Reference Voltage Feed-5 Volt Reference

Optical Fuel Temperature Sensor


Object Number: 62449 Size: CH

Connector Part Information
    • 12052848
    • 6 Way F Metri-Pack 150 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

GRY

474

Reference Voltage Feed-5 Volt Reference

B

BRN/WHT

633

Camshaft Position Sensor Signal

C

ORN

1799

Camshaft Position Sensor Signal-High Resolution

D

PNK/BLK

632

Camshaft Position Sensor Return

E

YEL

1578

Fuel Temperature Signal

F

PNK/BLK

632

Camshaft Position Sensor Return

Park/Neutral Position (PNP) and Backup Lamps Switch C1


Object Number: 68780 Size: CH

Connector Part Information
    • 12129840
    • 7 Way F Metri-Pack 150/280 Series (GRY)

Pin

Wire Color

Circuit No.

Function

A

--

--

Not Used

B

YEL

1737

Transmission Mounted Neutral Safety Switch Output-Park/Neutral

C

BRN

141

Fuse Output-Ignition 3-Type III Fuse

D

--

--

Not Used

E

DK BLU /WHT

805

Ignition Switch Output-Run/Heat/Crank

F

LT GRN

24

Backup Lamp Feed

G

PPL

806

Fuse Output-Crank-Type III Fuse

Park/Neutral Position (PNP) and Backup Lamps Switch C2


Object Number: 40412 Size: CH

Connector Part Information
    • 12191757
    • 4 Way F Metri-Pack 150 Series (NAT)

Pin

Wire Color

Circuit No.

Function

A-B

--

--

Not Used

C

BLK

901

PNP Switch

D

BLK

901

PNP Switch

Transmission Input Speed Sensor (TISS)


Object Number: 232831 Size: CH

Connector Part Information
    • 12162194
    • 2 Way F Metri-Pack 150.2 Series P2S (BLK)

Pin

Wire Color

Circuit No.

Function

A

DK BLU /WHT

1231

Transmission Input Speed Sensor Return

B

RED/BLK

1230

Transmission Input Speed Sensor Signal

Transmission Output Speed Sensor (TOSS)


Object Number: 232831 Size: CH

Connector Part Information
    • 12162194
    • 2 Way F Metri-Pack 150.2 Series P2S (BLK)

Pin

Wire Color

Circuit No.

Function

A

LT GRN /BLK

822

Vehicle Speed Sensor Return

B

PPL/WHT

821

Vehicle Speed Sensor Signal

Vehicle Speed Sensor (VSS)


Object Number: 38554 Size: CH

Connector Part Information
    • 12124819
    • 2 Way F Metri-Pack 280 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

LT GRN /BLK

822

Vehicle Speed Sensor Return

B

PPL/WHT

821

Vehicle Speed Sensor Signal

Vehicle Speed Sensor Calibrator


Object Number: 62467 Size: CH

Connector Part Information
    • 12066130
    • 9 Way F Micro-Pack 100 Series (NAT)

Pin

Wire Color

Circuit No.

Function

7

LT GRN /BLK

822

Vehicle Speed Sensor Return

8

BLK/WHT

451

Engine Control Module Ground

9

PNK

439

Fuse Output-Ignition 1-Type III Fuse

10

YEL/BLK

1827

Vehicle Speed Signal-128000 Pulses Per Mile

11

--

--

Not Used

12

PPL/WHT

821

Vehicle Speed Sensor Signal

13

BRN

437

Vehicle Speed Signal

14

DK GRN /WHT

817

Vehicle Speed Signal-4000 Pulses Per Mile

15

DK GRN

389

Vehicle Speed Signal-4000 Pulses Per Mile

Water In Fuel Indicator Sensor


Object Number: 309547 Size: CH

Connector Part Information
    • 12015793
    • 3 Way F Weather-Pack (BLK)

Pin

Wire Color

Circuit No.

Function

A

PNK

239

Fuse Output-Ignition 1-Type III Fuse

B

YEL/BLK

508

Water In Fuel Indicator Lamp Output

C

BLK

550

Ground

Engine Controls Connector End Views L57 MFI

Table 1: Barometric Pressure Sensor
Table 2: Clutch Pedal Position (CPP) Switch
Table 3: Cold Advance Solenoid, Engine Coolant Temperature Switch
Table 4: Engine Speed Sensor
Table 5: Fuel Heater
Table 6: Fuel Lift Pump
Table 7: Fuel Pump Relay
Table 8: Fuel Sender
Table 9: Glow Plug Controller
Table 10: Glow Plug Relay
Table 11: Park/Neutral Position (PNP) and Backup Lamps Switch C1
Table 12: Park/Neutral Position (PNP) and Backup Lamps Switch C2
Table 13: Throttle Position (TP) Sensor
Table 14: Transmission Control Module (TCM) C1
Table 15: Transmission Control Module (TCM) C2
Table 16: Transmission Input Speed Sensor (TISS)
Table 17: Transmission Output Speed Sensor (TOSS)
Table 18: Vehicle Speed Sensor (VSS)
Table 19: Vehicle Speed Sensor Calibrator
Table 20: Water In Fuel Indicator Sensor

Barometric Pressure Sensor


Object Number: 309547 Size: CH

Connector Part Information
    • 12020737
    • 3 Way M Weather-Pack (BRN)

Pin

Wire Color

Circuit No.

Function

A

BLK

452

Sensor Return

B

GRY/BLK

433

Barometric Pressure Sensor Signal

C

GRY

416

Reference Voltage Feed-5 Volt Reference

Clutch Pedal Position (CPP) Switch


Object Number: 39667 Size: CH

Connector Part Information
    • 12129136
    • 4 Way F Metri-Pack 280 Series, Flexlock (BLK)

Pin

Wire Color

Circuit No.

Function

A

DK BLU /WHT

805

Ignition Switch Output-Run/Heat/Crank

B

--

--

Not Used

C

PPL

806

Fuse Output-Crank-Type III Fuse

D

--

--

Not Used

Cold Advance Solenoid, Engine Coolant Temperature Switch


Object Number: 350882 Size: CH

Connector Part Information
    • 02973872
    • 2 Way F 56 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

PNK

539

Fuse Output-Ignition 1-Type III Fuse

B

LT GRN

531

Cold Advance Control Solenoid Feed

Engine Speed Sensor


Object Number: 38552 Size: CH

Connector Part Information
    • 12103584
    • 2 Way M Weather-Pack (BRN)

Pin

Wire Color

Circuit No.

Function

A

WHT

935

Transmission Control Module

B

BLK

452

Sensor Return

Fuel Heater


Object Number: 295500 Size: CH

Connector Part Information
    • 12020397
    • 3 Way F Metri-Pack 280 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

BLK

150

Ground

B

--

--

Not Used

C

PNK

539

Fuse Output-Ignition 1-Type III Fuse

Fuel Lift Pump


Object Number: 38281 Size: CH

Connector Part Information
    • 12059473
    • 2 Way M Weather-Pack (BLK)

Pin

Wire Color

Circuit No.

Function

A

BLK

150

Ground

B

GRY

120

Fuel Pump Motor Feed

Fuel Pump Relay


Object Number: 39685 Size: CH

Connector Part Information
    • 12110539
    • 5 Way F Metri-Pack 280 Series, Flexlock (BLK)

Pin

Wire Color

Circuit No.

Function

30

GRY

120

Fuel Pump Motor Feed

85

PNK

439

Fuse Output-Ignition 1-Type III Fuse

86

BLK/WHT

451

Engine Control Module Ground

87

ORN

440

Fuse Output-Battery-Type III Fuse

87A

RED

490

Fuel Pump Relay Feed-N.C. Contact-Prime

Fuel Sender


Object Number: 258300 Size: CH

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

Pin

Wire Color

Circuit No.

Function

A

PPL

30

Fuel Gauge Sensor Signal

B-C

--

--

Not Used

D

BLK

150

Ground

Glow Plug Controller


Object Number: 441449 Size: CH

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

Pin

Wire Color

Circuit No.

Function

A

--

--

Not Used

B

PPL

806

Fuse Output-Crank-Type III Fuse

C

BRN

104

Fuse Output-Glow Plug-Type III Fuse

D

PNK

539

Fuse Output-Ignition 1-Type III Fuse

E

BLK

150

Ground

Glow Plug Relay


Object Number: 39670 Size: CH

Connector Part Information
    • 12129716
    • 4 Way F Metri-Pack 280 Series, Flexlock (GRY)

Pin

Wire Color

Circuit No.

Function

30

DK BLU

507

Glow Plug Indicator Lamp Signal

85

BRN

104

Fuse Output-Glow Plug-Type III Fuse

86

BLK

250

Ground

87

BLK

250

Ground

Park/Neutral Position (PNP) and Backup Lamps Switch C1


Object Number: 68780 Size: CH

Connector Part Information
    • 12129840
    • 7 Way F Metri-Pack 150/280 Series (GRY)

Pin

Wire Color

Circuit No.

Function

A

--

--

Not Used

B

YEL

1737

Transmission Mounted Neutral Safety Switch Output-Park/Neutral

C

BRN

141

Fuse Output-Ignition 3-Type III Fuse

D

--

--

Not Used

E

DK BLU /WHT

805

Ignition Switch Output-Run/Heat/Crank

F

LT GRN

24

Backup Lamp Feed

G

PPL

806

Fuse Output-Crank-Type III Fuse

Park/Neutral Position (PNP) and Backup Lamps Switch C2


Object Number: 40412 Size: CH

Connector Part Information
    • 12191757
    • 4 Way F Metri-Pack 150 Series (NAT)

Pin

Wire Color

Circuit No.

Function

A-B

--

--

Not Used

C

BLK

901

PNP Switch

D

BLK

901

PNP Switch

Throttle Position (TP) Sensor


Object Number: 68730 Size: CH

Connector Part Information
    • 12110293
    • 3 Way F Metri-Pack 150 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

GRY

416

Reference Voltage Feed-5 Volt Reference

B

DK BLU

417

Throttle Position Sensor Signal

C

BLK

452

Sensor Return

Transmission Control Module (TCM) C1


Object Number: 449163 Size: CH

Connector Part Information
    • 12059126
    • 32 Way F Micro-Pack 100 Series (PPL)

Pin

Wire Color

Circuit No.

Function

C1

BLK/WHT

451

Engine Control Module Ground

C2

BLK/WHT

451

Engine Control Module Ground

C3

BLK

452

Sensor Return

C4

GRY

416

Reference Voltage Feed-5 Volt Reference

C5-C14

--

--

Not Used

C15

LT BLU /WHT

1229

Transmission Force Motor Return

C16

PNK

439

Fuse Output-Ignition 1-Type III Fuse

D1

--

--

Not Used

D2

BRN

437

Vehicle Speed Signal

D3

DK BLU /WHT

1231

Transmission Input Speed Sensor Return

D4

RED/BLK

1230

Transmission Input Speed Sensor Signal

D5

--

--

Not Used

D6

WHT

935

Engine Speed Sensor

D7

BLK

452

Sensor Return

D8

DK BLU

417

Throttle Position Sensor Signal

D9-D12

--

--

Not Used

D13

YEL/BLK

1227

Transmission Temperature Sensor Signal

D14

GRY/BLK

433

Barometric Pressure Sensor Signal

D15

--

--

Not Used

D16

RED/BLK

1228

Transmission Force Motor Feed

Transmission Control Module (TCM) C2


Object Number: 73144 Size: CH

Connector Part Information
    • 12059125
    • 24 Way F Micro-Pack 100 Series (PPL)

Pin

Wire Color

Circuit No.

Function

A1-A2

--

--

Not Used

A3

PNK

1224

Transmission Pressure Switch Signal-Bit 1

A4

DK BLU

1225

Transmission Pressure Switch Signal-Bit 2

A5

RED

1226

Transmission Pressure Switch Signal-Bit 3

A6

YEL/BLK

1223

Shift Solenoid B Output

A7

LT GRN

1222

Shift Solenoid A Output

A8

WHT/BLK

448

Diagnostic Enable Signal-Powertrain

A9-A11

--

--

Not Used

A12

ORN

440

Fuse Output-Battery-Type III Fuse

B1-B3

--

--

Not Used

B4

PPL

420

Brake Pedal Switch Output-Torque Converter Clutch

B5

BRN

418

Torque Converter Clutch Solenoid Output-Pulse Width Modulated

B6-B8

--

--

Not Used

B9

GRY

1234

Do Not Shift Indicator Lamp Output

B10

TAN

800

Serial Data Signal-UART-8192 BAUD-Primary

B11-B12

--

--

Not Used

Transmission Input Speed Sensor (TISS)


Object Number: 232831 Size: CH

Connector Part Information
    • 12162194
    • 2 Way F Metri-Pack 150.2 Series P2S (BLK)

Pin

Wire Color

Circuit No.

Function

A

DK BLU /WHT

1231

Transmission Input Speed Sensor Return

B

RED/BLK

1230

Transmission Input Speed Sensor Signal

Transmission Output Speed Sensor (TOSS)


Object Number: 232831 Size: CH

Connector Part Information
    • 12162194
    • 2 Way F Metri-Pack 150.2 Series P2S (BLK)

Pin

Wire Color

Circuit No.

Function

A

LT GRN /BLK

822

Vehicle Speed Sensor Return

B

PPL/WHT

821

Vehicle Speed Sensor Signal

Vehicle Speed Sensor (VSS)


Object Number: 38554 Size: CH

Connector Part Information
    • 12124819
    • 2 Way F Metri-Pack 280 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

LT GRN /BLK

822

Vehicle Speed Sensor Return

B

PPL/WHT

821

Vehicle Speed Sensor Signal

Vehicle Speed Sensor Calibrator


Object Number: 62467 Size: CH

Connector Part Information
    • 12066130
    • 9 Way F Micro-Pack 100 Series (NAT)

Pin

Wire Color

Circuit No.

Function

7

LT GRN /BLK

822

Vehicle Speed Sensor Return

8

BLK/WHT

451

Engine Control Module Ground

9

PNK

439

Fuse Output-Ignition 1-Type III Fuse

10

YEL/BLK

1827

Vehicle Speed Signal-128000 Pulses Per Mile

11

--

--

Not Used

12

PPL/WHT

821

Vehicle Speed Sensor Signal

13 (MT1)

BRN

437

Vehicle Speed Signal

13 MW3)-14

--

--

Not Used

15

DK GRN

389

Vehicle Speed Signal-4000 Pulses Per Mile

Water In Fuel Indicator Sensor


Object Number: 309547 Size: CH

Connector Part Information
    • 12015793
    • 3 Way F Weather-Pack (BLK)

Pin

Wire Color

Circuit No.

Function

A

PNK

539

Fuse Output-Ignition 1-Type III Fuse

B

YEL/BLK

508

Water In Fuel Indicator Lamp Output

C

BLK

150

Ground