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.

1999 Chevrolet Camaro SS, 2D Convertible, AutomaticFACTORY OEM SERVICE PROCEDURE

Powertrain Control Module (Pcm) Connector Terminal Identification (3.1L - Grand PRIX, Lumina & Monte CARLO)

POWERTRAIN CONTROL MODULE (PCM) CONNECTOR TERMINAL IDENTIFICATION (3.1L - GRAND PRIX, LUMINA & MONTE CARLO) ⁽¹⁾

Connector

Terminal No.

Wire Color

Function

BLK

⁽²⁾ Transmission Fluid Temperature Sensor Ground

.....

Not Used

ORG

Fuel Gauge Control

LT GRN

1-2 Shift Solenoid Valve Control

DK BLU

Cooling Fan High Speed Control

DK GRN

Cooling Fan Low Speed Control

⁽³⁾ BLK

Camshaft Position Sensor Signal

PPL/WHT

Crankshaft Position 3x Sensor Reference High

LT BLU/BLK

Crankshaft Position 24x Sensor Signal

GRY

⁽²⁾ Manifold Absolute Pressure Sensor Reference Voltage

11 & 12

.....

Not Used

ORG/BLK

⁽²⁾ MAP & ECT Sensor Ground

.....

Not Used

TAN

Serial Data (UART)

BLK/WHT

Powertrain Control Module Ground

BLK

Intake Air Temperature Sensor Ground

.....

Not Used

PNK

Ignition Positive Voltage

ORG

Battery Positive Voltage

21-27

.....

Not Used

TAN/WHT

Heated Oxygen Sensor No. 2 Low

TAN

Heated Oxygen Sensor No. 1 Low

PPL

Torque Converter Clutch/Brake Light Switch

BLK

⁽²⁾ EGR Sensor Ground

⁽⁴⁾ GRY/BLK

EGR Valve Control Low

DK BLU

Knock Sensor Signal

34 & 35

.....

Not Used

BRN

Charge Warning Indicator Control

.....

Not Used

LT GRN/WHT

Idle Air Control Valve "B" High

39-42

.....

Not Used

BLK

Fuel Injector No. 1 Control

YEL/BLK

2-3 Shift Solenoid Valve Control

.....

Not Used

PNK/BLK

Fuel Injector No. 3 Control

LT GRN/BLK

Fuel Injector No. 2 Control

RED/BLK

Crankshaft Position 3x Sensor Reference Low

49-52

.....

Not Used

TAN/BLK

By-Pass Valve Control

WHT

Ignition Control

DK GRN

Vehicle Speed Sensor Output

BLK/WHT

Powertrain Control Module Ground

BLK/WHT

Powertrain Control Module Ground

.....

Not Used

PPL

Serial Data (Class II)

BLK/WHT

Powertrain Control Module Ground

BLK

⁽²⁾ Throttle Position Sensor Return

62 & 63

.....

Not Used

YEL

Vehicle Speed Sensor High

PPL

Vehicle Speed Sensor Low

66 & 67

.....

Not Used

YEL

Transaxle Range Switch "B"

YEL

Mass Airflow Sensor Signal

DK BLU

Theft Deterrent Fuel Enable Signal

.....

Not Used

DK GRN

Cruise Control Disable/Inhibit Control

BLK/WHT

Fuel Injector No. 5 Control

.....

Not Used

DK GRN

⁽²⁾ Hot Coolant Temperature Indicator Control

DK GRN/WHT

EVAP Canister Purge Valve Control

77 & 78

.....

Not Used

YEL/BLK

Fuel Injector No. 6 Control

BLK

⁽²⁾ AC Pressure Sensor Ground

.....

Not Used

WHT

EVAP Canister Vent Valve Control

DK GRN/WHT

Fuel Pump Relay Control

⁽⁵⁾ RED

EGR Valve Ignition System Voltage

BRN/WHT

Malfunction Control

BRN/WHT

Low Oil Level Indicator Control

LT BLU/WHT

Idle Air Control Valve "A" High

WHT

⁽²⁾ Tachometer Control

.....

Not Used

PPL

Heated Oxygen Sensor No. 1 Signal

PPL/WHT

Heated Oxygen Sensor No. 2 Signal

12-15

.....

Not Used

WHT

Transaxle Range Switch "D"

.....

Not Used

BLK/WHT

Transaxle Range Switch "A"

19-21

.....

Not Used

⁽⁶⁾ LT GRN

A/C Request

23 & 24

.....

Not Used

LT GRN

Manifold Absolute Pressure Sensor Signal

YEL

Engine Coolant Temperature Sensor Signal

RED/BLK

A/C Refrigerant Pressure Sensor Signal

BRN

EGR Pintle Position Signal

.....

Not Used

GRY

⁽²⁾ 5-Volt Reference

31 & 32

.....

Not Used

GRY

5-Volt Reference "A"

GRY

5-Volt Reference "B"

BLK

⁽²⁾ Fuel Tank Pressure Sensor Ground

GRY

Change Oil Soon Indicator Control Circuit

37 & 38

.....

Not Used

DK GRN/WHT

A/C Compressor Clutch Relay Control

40 & 41

.....

Not Used

LT BLU/BLK

Fuel Injector No. 4 Control

.....

Not Used

LT BLU/BLK

Idle Air Control Valve "A" Low

45-48

.....

Not Used

LT GRN/BLK

Idle Air Control Valve "B" Low

TAN

Intake Air Temperature Sensor

51-54

.....

Not Used

DK GRN

Fuel Tank Pressure Sensor Signal

GRY

Transaxle Range Switch "C"

.....

Not Used

BRN

Engine Oil Level Sensor Input

WHT

Cruise Control Status

.....

Not Used

RED

Generator Terminal "L" Control

62-65

.....

Not Used

DK BLU

Throttle Position Sensor Signal

.....

Not Used

⁽⁷⁾ YEL

Transaxle Fluid Temperature Sensor

PPL

Fuel Level Sensor Signal

LT GRN

⁽²⁾ Crankshaft Position 24x Sensor Battery Positive Voltage

.....

Not Used

RED/WHT

CMP/CKP Sensor Battery Positive Voltage

BLK

Camshaft Position/Crankshaft Position Sensor Ground

YEL/BLK

⁽²⁾ Crankshaft Position 24x Sensor Ground

75-77

.....

Not Used

BRN

Torque Converter Clutch PWM Solenoid Control

TAN/BLK

Torque Converter Clutch Solenoid

.....

Not Used

⁽¹⁾	See Figure.

⁽²⁾	Not used on Lumina and Monte Carlo.

⁽³⁾	Black/White wire on Grand Prix.

⁽⁴⁾	Red wire on Grand Prix.

⁽⁵⁾	Gray wire on Grand Prix.

⁽⁶⁾	Dark Green/White wire on Grand Prix.

⁽⁷⁾	Yellow/Black wire on Grand Prix.

Factory Service Tools

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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.

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Safety Warning

Powertrain Control Module (Pcm) Connector Terminal Identification (3.1L - Grand PRIX, Lumina &amp; Monte CARLO)

Use the Manual With the Right Hardware

When to See a Mechanic

Rather have a pro handle this?

Powertrain Control Module (Pcm) Connector Terminal Identification (3.1L - Grand PRIX, Lumina & Monte CARLO)