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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 (3.8L - BONNEVILLE, EIGHTY EIGHT, LE SABRE & RIVIERA)

1999 Buick Regal LS

Powertrain Control Module (Pcm) Connector Terminal Identification (3.8L - BONNEVILLE, Eighty Eight, LE Sabre & Riviera)

1999 Buick Regal LSSECTION Powertrain Control Module (Pcm) Connector Terminal Identification (3.8L - BONNEVILLE, Eighty Eight, LE Sabre & Riviera)

POWERTRAIN CONTROL MODULE (PCM) CONNECTOR TERMINAL IDENTIFICATION (3.8L - BONNEVILLE, EIGHTY EIGHT, LE SABRE & RIVIERA) ⁽¹⁾

Connector

Terminal No.

Wire Color

Function

.....

Not Used

PPL

⁽²⁾ CCR Brake Throttle Input

PPL/WHT

⁽²⁾ Fuel Level Output

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 PCM Input

PPL/WHT

Crankshaft Position 3x Sensor Reference

LT BLU/BLK

Crankshaft Position 18x Sensor Reference

10 & 11

.....

Not Used

BLK

Engine Coolant Temperature Sensor Ground

ORN/BLK

Manifold Absolute Pressure Sensor Ground

.....

Not Used

TAN

Serial Data (UART)

BLK/WHT

Powertrain Control Module Ground

RED/BLK

Intake Air Temperature Sensor Ground

.....

Not Used

PNK

Ignition Positive Voltage

RED

Battery Positive Voltage

.....

Not Used

PNK

Transmission Fluid Pressure Switch "A" Input

23-27

.....

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 Ground

DK BLU

Bank No. 1 Knock Sensor Signal

LT BLU

Bank No. 2 Knock Sensor Signal

.....

Not Used

BRN

⁽²⁾ Volt Indicator Control

.....

Not Used

LT GRN/WHT

Idle Air Control Valve "B" High

BRN

⁽²⁾ Fuel Pump PWM Control

40-42

.....

Not Used

YEL/BLK

Fuel Injector No. 6 Control

YEL/BLK

2-3 Shift Solenoid Valve Control

.....

Not Used

LT BLU/BLK

Fuel Injector No. 4 Control

BLK/WHT

Fuel Injector No. 5 Control

RED/BLK

Reference Low

49-52

.....

Not Used

TAN/BLK

By-Pass Valve Control

WHT

Ignition Control

DK GRN/WHT

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

Throttle Position Sensor Ground

DK BLU/WHT

A/T Input Shaft Speed Sensor Low

RED/BLK

A/T Input Shaft Speed Sensor High

YEL

Vehicle Speed Sensor High

PPL

Vehicle Speed Sensor Low

.....

Not Used

PNK/BLK

⁽²⁾ Oil Life Reset Input

YEL

Transaxle Range Switch Input "B"

YEL

Mass Airflow Sensor Signal

DK BLU

Theft Deterrent Fuel Enable Input

ORN/BLK

Traction Control Desired Torque Input

DK GRN

Cruise Control Disable/Inhibit Control

LT GRN/BLK

Fuel Injector No. 2 Control

.....

Not Used

DK GRN

⁽²⁾ Hot Coolant Indicator Control

DK GRN/WHT

EVAP Canister Purge Control

77 & 78

.....

Not Used

BLK

Fuel Injector No. 1 Control

.....

Not Used

.....

Not Used

WHT

EVAP Canister Vent Valve Control

DK GRN/WHT

Fuel Pump Relay Control

WHT

EGR Valve Control

BRN/WHT

Malfunction Indicator Light Control

BRN/WHT

Oil Level Indicator Control

LT BLU/WHT

Idle Air Control Valve "A" High

.....

Not Used

TAN/BLK

Traction Control Delivered Torque Control

PPL

Heated Oxygen Sensor No. 1 Signal

PPL/WHT

Heated Oxygen Sensor No. 2 Signal

12-15

.....

Not Used

WHT

Transaxle Range Switch Input "P"

RED

Transmission Fluid Pressure Switch "C"

BLK/WHT

Transaxle Range Switch Input "A"

19-21

.....

Not Used

LT GRN

⁽²⁾ A/C Request

PPL

Crank Signal

PNK

⁽³⁾ Ignition Positive Voltage

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

30-32

.....

Not Used

GRY

5-Volt Reference "A"

GRY

5-Volt Reference "B"

BLK

Sensor Ground

GRY

⁽²⁾ Oil Life Indicator Control

37-38

.....

Not Used

DK GRN/WHT

A/C Compressor Clutch Relay Control

40 & 41

.....

Not Used

PNK/BLK

Fuel Injector No. 3 Control

.....

Not Used

LT BLU/BLK

Idle Air Control Valve "A" Low

RED/BLK

Pressure Control Solenoid High

LT BLU/WHT

Pressure Control Solenoid Low

47 & 48

.....

Not Used

LT GRN/BLK

Idle Air Control Valve "B" High

TAN

Intake Air Temperature Sensor Signal

.....

Not Used

LT BLU

⁽²⁾ Shift Select Switch Input

53 & 54

.....

Not Used

DK GRN

Fuel Tank Pressure Sensor Signal

GRY

Transaxle Range Switch Input "C"

DK BLU

Transmission Fluid Pressure Switch "B"

BRN

Engine Oil Level Sensor Signal

⁽⁴⁾ WHT

Cruise Control Status

.....

Not Used

RED

Generator Terminal "L" Control

.....

Not Used

YEL

Torque Converter Clutch Release Switch Input

64 & 65

.....

Not Used

DK BLU

Throttle Position Sensor Signal

.....

Not Used

YEL/BLK

Transaxle Fluid Temperature Sensor

PPL

⁽²⁾ Fuel Level Input

70-75

.....

Not Used

YEL

Starter Enable

GRY

Boost Control Solenoid Control

BRN

Torque Converter Clutch PWM Solenoid Control

79 & 80

.....

Not Used

⁽¹⁾	See Figure.

⁽²⁾	Not used on Riviera.

⁽³⁾	Not used on Bonneville, Eighty Eight and Le Sabre.

⁽⁴⁾	Light Blue/Black wire on Riviera.

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.

Safety Warning

Powertrain Control Module (Pcm) Connector Terminal Identification (3.8L - BONNEVILLE, Eighty Eight, LE Sabre &amp; Riviera)

Use the Manual With the Right Hardware

When to See a Mechanic

Powertrain Control Module (Pcm) Connector Terminal Identification (3.8L - BONNEVILLE, Eighty Eight, LE Sabre & Riviera)