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 MANUALSBUICK1999REGAL LSREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - SYSTEM TESTING & ENGINE COMPONENT TESTSCOMPUTERIZED ENGINE CONTROLSPOWERTRAIN CONTROL MODULE (PCM) CONNECTOR TERMINAL IDENTIFICATIONPOWERTRAIN CONTROL MODULE (PCM) CONNECTOR TERMINAL IDENTIFICATION (3.1L - CENTURY)

1999 Buick Regal LS

Powertrain Control Module (Pcm) Connector Terminal Identification (3.1L - Century)

1999 Buick Regal LSSECTION Powertrain Control Module (Pcm) Connector Terminal Identification (3.1L - Century)

POWERTRAIN CONTROL MODULE (PCM) CONNECTOR TERMINAL IDENTIFICATION (3.1L - CENTURY) ⁽¹⁾

Connector

Terminal No.

Wire Color

Function

BLK

Transmission Fluid Temperature Sensor Ground

2 & 3

.....

Not Used

LT GRN

1-2 Shift Solenoid Valve Control

DK BLU

Cooling Fan High Speed Control

DK GRN

Cooling Fan Low Speed Control

BLK

Camshaft Position PWM Input

PPL/WHT

Crankshaft Position 3x Sensor Reference

LT BLU/BLK

Crankshaft Position 24x Sensor Reference

GRY

Manifold Absolute Pressure High

11 & 12

.....

Not Used

ORG/BLK

Engine Coolant Temperature/Manifold Absolute Pressure Sensor Ground

14 & 15

.....

Not Used

BLK/WHT

Powertrain Control Module Ground

BLK

Intake Air Temperature Sensor Ground

.....

Not Used

PPL

Ignition Positive Voltage

ORG

Battery Positive Voltage

21-27

.....

Not Used

TAN/WHT

Heated Oxygen Sensor No. 2 Signal Low

TAN

Heated Oxygen Sensor No. 1 Signal Low

PPL

Torque Converter Clutch Brake Switch Input

BLK

EGR Pintle Position Sensor Ground

GRY

EGR Valve Control

DK BLU

Knock Sensor Signal

34-37

.....

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

.....

Not Used

PNK/BLK

Fuel Injector No. 3 Control

LT GRN/BLK

Fuel Injector No. 2 Control

RED/BLK

Reference Low

49-52

.....

Not Used

TAN/BLK

By-Pass Valve Control

WHT

Ignition Control

DK GRN/WHT

Vehicle Speed Sensor Signal Output

BLK/WHT

Powertrain Control Module Ground

BLK/WHT

Powertrain Control Module Ground

DK GRN

Serial Data (Class II)

.....

Not Used

BLK/WHT

Powertrain Control Module Ground

BLK

Throttle Position Sensor Ground

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

70 & 71

.....

Not Used

DK GRN

Cruise Control Disable/Inhibit Control

BLK/WHT

Fuel Injector No. 5 Control

74 & 75

.....

Not Used

DK GRN/WHT

EVAP Canister Purge Valve Control

77 & 78

.....

Not Used

YEL/BLK

Fuel Injector No. 6 Control

BLK

A/C Refrigerant Pressure Sensor Ground

.....

Not Used

WHT

EVAP Canister Vent Valve Solenoid Control

DK GRN/WHT

Fuel Pump Relay Control

WHT

EGR Valve Ignition Positive Voltage

BRN/WHT

Malfunction Indicator Light Control

.....

Not Used

LT BLU/WHT

Idle Air Control Valve "A" High

8 & 9

.....

Not Used

PPL

Heated Oxygen Sensor No. 1 Signal High

PPL/WHT

Heated Oxygen Sensor No. 2 Signal High

12-15

.....

Not Used

WHT

Transaxle Range Switch "P"

.....

Not Used

BLK/WHT

Transaxle Range Switch "A"

TAN/BLK

Engine Oil Pressure Switch Input

20 & 21

.....

Not Used

DK GRN/WHT

A/C Request

PPL

Ignition Positive Voltage (Start Only)

PNK

Ignition Positive Voltage (Run/Start)

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

GRY

Generator Terminal "F" Monitor

GRY

5-Volt Reference "A"

31 & 32

.....

Not Used

GRY

5-Volt Reference "A"

GRY

5-Volt Reference "B"

BLK

Sensor Ground

36-38

.....

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 Switch Input

WHT

Cruise Control Status

.....

Not Used

RED

Generator Terminal "L" Control

62-65

.....

Not Used

DK BLU

Throttle Position Sensor Signal

.....

Not Used

YEL/BLK

Transaxle Fluid Temperature Sensor

PPL

Fuel Level Sensor Input

LT GRN

Crankshaft Position Sensor Battery Positive Voltage

.....

Not Used

RED/WHT

Camshaft Position Sensor Battery Positive Voltage

BLK

Camshaft Position Sensor Ground

YEL/BLK

Crankshaft Position Sensor Ground

.....

Not Used

YEL/BLK

Starter Enable Control

.....

Not Used

BRN

Torque Converter Clutch PWM Solenoid Control

TAN/BLK

Torque Converter Clutch Solenoid Control

.....

Not Used

⁽¹⁾	See Figure.

RENDER: 1.0x

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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.