Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSCHEVROLET1999PICKUP C2500, 2D PICKUP, 6.5 F, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM & COMPONENT TESTSCOMPUTERIZED ENGINE CONTROLSPOWERTRAIN CONTROL MODULE (PCM) CONNECTOR TERMINAL IDENTIFICATIONPOWERTRAIN CONTROL MODULE (PCM) - 4.3L ("G" SERIES)

1999 Chevrolet Pickup C2500, 2D Pickup, 6.5 F, Automatic

Powertrain Control Module (Pcm) - 4.3L ("G" Series)

1999 Chevrolet Pickup C2500, 2D Pickup, 6.5 F, AutomaticSECTION Powertrain Control Module (Pcm) - 4.3L ("G" Series)

POWERTRAIN CONTROL MODULE (PCM) - 4.3L ("G" SERIES) ⁽¹⁾

Connector

Terminal No.

Wire Color

Function

C1 (Blue)

1 & 2

.....

Not Used

C1 (Blue)

BRN/WHT

CMP Sensor 1x Signal

C1 (Blue)

4-6

.....

Not Used

C1 (Blue)

TAN

HO2S Bank 2 Sensor 1 Low

C1 (Blue)

PNK/BLK

CMP Sensor Ground

C1 (Blue)

PPL

Fuel Level Output

C1 (Blue)

TAN/BLK

TCC Solenoid Control

C1 (Blue)

11 & 12

.....

Not Used

C1 (Blue)

WHT

3-2 Shift Solenoid Valve Control

C1 (Blue)

.....

Not Used

C1 (Blue)

YEL/BLK

VSS Output

C1 (Blue)

16-18

.....

Not Used

C1 (Blue)

PPL/WHT

HO2S Bank 1 Sensor 1 High

C1 (Blue)

.....

Not Used

C1 (Blue)

PPL

HO2S Bank 2 Sensor 1 High

C1 (Blue)

PPL/WHT

HO2S Bank 1 Sensor 3 High

C1 (Blue)

23 & 24

.....

Not Used

C1 (Blue)

TAN/WHT

HO2S Bank 1 Sensor 1 Low

C1 (Blue)

TAN/WHT

HO2S Bank 1 Sensor 3 Low

C1 (Blue)

.....

Not Used

C1 (Blue)

PPL

CKP Sensor Ground

C1 (Blue)

LT GRN/BLK

VSS Low

C1 (Blue)

PPL/WHT

VSS High

C1 (Blue)

YEL

CKP Sensor 3x Signal

C1 (Blue)

.....

Not Used

C2 (Red)

.....

Not Used

C2 (Red)

WHT

EVAP Canister Vent Solenoid Control

C2 (Red)

.....

Not Used

C2 (Red)

YEL/BLK

2-3 Shift Solenoid Valve Control

C2 (Red)

.....

Not Used

C2 (Red)

LT GRN

1-2 Shift Solenoid Valve Control

C2 (Red)

BRN

TCC PWM Solenoid Valve Control

C2 (Red)

BLK

Fuel Injector No. 1 Control

C2 (Red)

YEL/BLK

Fuel Injector No. 6 Control

C2 (Red)

BRN

EGR Pintle Position Signal

C2 (Red)

11 & 12

.....

Not Used

C2 (Red)

LT GRN/WHT

IAC Coil B High

C2 (Red)

LT BLU/WHT

IAC Coil A High

C2 (Red)

LT GRN/BLK

Fuel Injector No. 2 Control

C2 (Red)

PNK/BLK

Fuel Injector No. 3 Control

C2 (Red)

17 & 18

.....

Not Used

C2 (Red)

DK BLU

KS Signal

C2 (Red)

.....

Not Used

C2 (Red)

LT GRN

MAP Sensor Signal

C2 (Red)

TAN

IAT Sensor Signal

C2 (Red)

YEL

ECT Sensor Signal

C2 (Red)

DK BLU

TP Sensor Signal

C2 (Red)

DK GRN

Fuel Tank Pressure Sensor Signal

C2 (Red)

.....

Not Used

C2 (Red)

YEL/BLK

TFT Sensor Signal

C2 (Red)

YEL

MAF Sensor Signal

C2 (Red)

LT GRN/BLK

IAC Coil B Low

C2 (Red)

LT BLU/BLK

IAC Coil A Low

C2 (Red)

BLK/WHT

Fuel Injector No. 5 Control

C2 (Red)

LT BLU/BLK

Fuel Injector No. 4 Control

C3 (Clear)

DK GRN/WHT

A/C Compressor Clutch Relay Control

C3 (Clear)

DK GRN/WHT

EVAP Canister Purge Solenoid Control

C3 (Clear)

.....

Not Used

C3 (Clear)

BLK

Sensor Ground

C3 (Clear)

.....

Not Used

C3 (Clear)

RED/BLK

Pressure Control Solenoid Valve High

C3 (Clear)

7 & 8

.....

Not Used

C3 (Clear)

WHT

IC Control

C3 (Clear)

.....

Not Used

C3 (Clear)

RED

Transmission Range C Input

C3 (Clear)

GRY

Sensor Reference Voltage

C3 (Clear)

PPL

Fuel Level Sensor Signal

C3 (Clear)

14 & 15

.....

Not Used

C3 (Clear)

LT BLU/WHT

Pressure Control Solenoid Valve Low

C3 (Clear)

TAN/WHT

VCM Ground

C3 (Clear)

TAN/WHT

VCM Ground

C3 (Clear)

BLK

Sensor Ground

C3 (Clear)

.....

Not Used

C3 (Clear)

ORG

Battery Voltage

C3 (Clear)

DK BLU

Transmission Range B Input

C3 (Clear)

PNK

Transmission Range A Input

C3 (Clear)

.....

Not Used

C3 (Clear)

GRN/WHT

A/C Request Signal

C3 (Clear)

WHT

PRNDL P

C3 (Clear)

GRY

Reference Voltage

C3 (Clear)

GRY

PRNDL C

C3 (Clear)

.....

Not Used

C3 (Clear)

DK GRN

A/C Cycling Switch Signal

C3 (Clear)

BLK/WHT

PRNDL A

C3 (Clear)

YEL

PRNDL B

C4 (Black)

DK GRN/WHT

Fuel Pump Relay Control

C4 (Black)

.....

Not Used

C4 (Black)

DK GRN/WHT

VSS Output

C4 (Black)

DK GRN

VSS Output

C4 (Black)

BRN/WHT

MIL Control

C4 (Black)

6-9

.....

Not Used

C4 (Black)

PPL

Brake Switch Input

C4 (Black)

PPL

Serial Data (Class II)

C4 (Black)

.....

Not Used

C4 (Black)

BRN

Ignition Voltage

C4 (Black)

14 & 15

.....

Not Used

C4 (Black)

RED

EGR Valve Control

C4 (Black)

.....

Not Used

C4 (Black)

PNK

Ignition Voltage

C4 (Black)

.....

Not Used

C4 (Black)

WHT

EGR Valve Ground

C4 (Black)

21-23

.....

Not Used

C4 (Black)

LT BLU/BLK

Cruise Engaged Input

⁽¹⁾	See Figure.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.

Safety Warning

Powertrain Control Module (Pcm) - 4.3L (&quot;G&quot; Series)

Use the Manual With the Right Hardware

When to See a Mechanic

Powertrain Control Module (Pcm) - 4.3L ("G" Series)