Manual sections

Wiring diagrams

• Abbreviations
• Accessory Drive Belts
• Adjustments
• Antenna Systems
• Anti-Lock Brake System
• Application
• Automatic Trans
• Auxiliary Emission Control Systems
• Axle Shafts
• Basic Trouble Shooting
• Brakes
• Charging System
• Check Lists
• Computer Relearn
• Cooling Fan
• Cooling System (Mechanical)
• Cruise Control Systems
• Diagnosis - A/t
• Diagnostic Connector Locations
• Driveline/axles
• Electrical Component Locations
• Emission Applications
• Engine
• Engine Performance
• Fuses & Circuit Breakers
• Gauges & Instrument Panels
• General Servicing - All Makes
• Heated Glass/defoggers
• Identification
• Manual & Power Steering
• Manual HVAC System
• MAP Guidelines
• Mechanical
• Mechanical - Hydraulic
• Metric Conversions
• Mirrors
• Overhaul & Testing - 440-t4 & 4t60
• Pin Voltage Charts
• Procedures
• Removal & Installation
• Reset Procedures
• Restraints Control Systems
• Rpo Codes
• Sensor Range Charts
• Specifications
• Starter
• Steering
• Steering Column
• Steering Column Switches
• Sun Roof/t-Top/convertible Top
• Suspension Front
• Suspension Rear
• Testing & Diagnostics
• Theory & Operation
• Traction Control Disable
• Transmission
• Wheel Alignment
• Windows
• Wiper/washer Systems
• Wiring Diagrams - Engine Performance

Repair manual

Diagnosis - A/t Buick Regal III

Step-by-step instructions on "Diagnosis - A/t" for Buick Regal III (1988–1997). Pick an article — removal, installation, adjustment and diagnostics with illustrations.

132subsections

132articles

297illustrations

THM 3T40 APPLICATION

1 article

• THM 3T40 APPLICATION

THM 4L60/700-R4 APPLICATION (1991-92)

1 article

• THM 4L60/700-R4 APPLICATION (1991-92)

THM 4T60 & 4T60-E APPLICATION (1991-92)

1 article

• THM 4T60 & 4T60-E APPLICATION (1991-92)

THM 4L80-E APPLICATION

1 article

• THM 4L80-E APPLICATION

THM 4L80-E SERIES CODE DESIGNATION

1 article

• THM 4L80-E SERIES CODE DESIGNATION

MP6 & MP7 APPLICATIONS (1991-92)

1 article

• MP6 & MP7 APPLICATIONS (1991-92)

DIAGNOSTIC FLOW

1 article

• DIAGNOSTIC FLOW

DESCRIPTION

1 article

• DESCRIPTION

TCC CONTROL COMPONENTS

1 article

• TCC CONTROL COMPONENTS

Brake Switch

1 article

• Brake Switch 1

Coolant Temperature Sensor

1 article

• Coolant Temperature Sensor

Electronic Control Module (ECM)

1 article

• Electronic Control Module (ECM)

TCC Solenoid Assembly

1 article

• TCC Solenoid Assembly

Throttle Position Sensor (TPS)

1 article

• Throttle Position Sensor (TPS)

Vacuum Sensor

1 article

• Vacuum Sensor

Vehicle Speed Sensor (VSS)

1 article

• Vehicle Speed Sensor (VSS)

3rd & 4th Gear Switches

1 article

• 3rd & 4th Gear Switches

TROUBLE SHOOTING

1 article

• TROUBLE SHOOTING

Problem In Electronic Control Module

1 article

• Problem In Electronic Control Module

Electrical Problems

1 article

• Electrical Problems

Valve Body Assembly

1 article

• Valve Body Assembly

Oil Pump Assembly

1 article

• Oil Pump Assembly

CONVERTER CLUTCH APPLY SLIPS, ROUGH OR SHUDDERS

1 article

• CONVERTER CLUTCH APPLY SLIPS, ROUGH OR SHUDDERS

CONVERTER CLUTCH DOES NOT RELEASE

1 article

• CONVERTER CLUTCH DOES NOT RELEASE

DIAGNOSTIC TOOLS

1 article

• DIAGNOSTIC TOOLS

RETRIEVING TROUBLE CODES

1 article

• RETRIEVING TROUBLE CODES 1

CLEARING TROUBLE CODES (EXCEPT SATURN)

1 article

• CLEARING TROUBLE CODES (EXCEPT SATURN)

CLEARING TROUBLE CODES (SATURN)

1 article

• CLEARING TROUBLE CODES (SATURN)

ENTERING SELF-DIAGNOSTICS

1 article

• ENTERING SELF-DIAGNOSTICS

EXITING SELF-DIAGNOSTICS

1 article

• EXITING SELF-DIAGNOSTICS

DISPLAYING TROUBLE CODES

1 article

• DISPLAYING TROUBLE CODES 3

CLEARING TROUBLE CODES

1 article

• CLEARING TROUBLE CODES

SYSTEM SELECTION

1 article

• SYSTEM SELECTION

TEST TYPE SELECTION

1 article

• TEST TYPE SELECTION

CLEAR CODES

1 article

• CLEAR CODES

DATA

1 article

• DATA

INPUTS

1 article

• INPUTS

OUTPUTS

1 article

• OUTPUTS

OVERRIDE

1 article

• OVERRIDE

SNAPSHOT

1 article

• SNAPSHOT

EXPLANATION OF SPECIFIC TEST SELECTION

1 article

• EXPLANATION OF SPECIFIC TEST SELECTION

SPECIFIC TEST SELECTION

1 article

• SPECIFIC TEST SELECTION

BCM Snapshot

1 article

• BCM Snapshot

ECM Snapshot

1 article

• ECM Snapshot

STATUS LIGHT INDICATORS

1 article

• STATUS LIGHT INDICATORS

ECM

1 article

• ECM

HIGH

1 article

• HIGH

MED

1 article

• MED

LOW

1 article

• LOW

OFF or VENT

1 article

• OFF or VENT

Left-Side AUTO

1 article

• Left-Side AUTO

°C

1 article

• °C

Upper Arrow (Icon)

1 article

• Upper Arrow (Icon)

BCM

1 article

• BCM

Lower Arrow (Icon)

1 article

• Lower Arrow (Icon) 8

TCC LOCK-UP PROBLEMS

1 article

• TCC LOCK-UP PROBLEMS

NO LOCK-UP CONDITION

1 article

• NO LOCK-UP CONDITION

BRAKE SWITCH TEST

1 article

• BRAKE SWITCH TEST

CHECKING SELF-DIAGNOSTIC SYSTEM

1 article

• CHECKING SELF-DIAGNOSTIC SYSTEM

TCC APPLY SOLENOID TEST

1 article

• TCC APPLY SOLENOID TEST

NO TCC RELEASE CONDITION

1 article

• NO TCC RELEASE CONDITION

CHECKING VOLTAGE TO TERMINAL "A" AT TRANSMISSION USING ALDL

1 article

• CHECKING VOLTAGE TO TERMINAL "A" AT TRANSMISSION USING ALDL

CHECKING VOLTAGE TO TERMINAL "A" AT TRANSMISSION

1 article

• CHECKING VOLTAGE TO TERMINAL "A" AT TRANSMISSION

CHECKING FOR GROUND AT TERMINAL "D" AT TRANS. USING ALDL

1 article

• CHECKING FOR GROUND AT TERMINAL "D" AT TRANS. USING ALDL

CHECKING FOR GROUND AT TERMINAL "D" AT TRANSMISSION

1 article

• CHECKING FOR GROUND AT TERMINAL "D" AT TRANSMISSION

COOLER LINE PRESSURE TEST

1 article

• COOLER LINE PRESSURE TEST

ELECTRICAL SWITCHES TEST

1 article

• ELECTRICAL SWITCHES TEST

Single Terminal Switch (8642473) & 2 Terminal Switch

1 article

• Single Terminal Switch (8642473) & 2 Terminal Switch

Single Terminal Switch (8642569 & 8634475) & 2 Terminal

1 article

• Single Terminal Switch (8642569 & 8634475) & 2 Terminal

GROUNDING "D" WIRE AT TRANSMISSION USING ALDL

1 article

• GROUNDING "D" WIRE AT TRANSMISSION USING ALDL

SELF-DIAGNOSTIC SYSTEM CHECK REATTA & RIVIERA

1 article

• SELF-DIAGNOSTIC SYSTEM CHECK REATTA & RIVIERA

Always Start Electrical Or Electronic Diagnosis Here

1 article

• Always Start Electrical Or Electronic Diagnosis Here 2

Diagnostic Aids

1 article

• Diagnostic Aids 1

CHART A-2, SERVICE ENGINE SOON LIGHT WON'T GO OUT OR FLASH (REATTA & RIVIERA)

1 article

• CHART A-2, SERVICE ENGINE SOON LIGHT WON'T GO OUT OR FLASH (REATTA & RIVIERA) 5

CHART B-1, BCM POWER & GROUNDS - REATTA & RIVIERA

1 article

• CHART B-1, BCM POWER & GROUNDS - REATTA & RIVIERA 1

CHART C, ECCP DISPLAY PROBLEMS (LOSS OF ECCP COMMUNICATIONS) (REATTA & RIVIERA)

1 article

• CHART C, ECCP DISPLAY PROBLEMS (LOSS OF ECCP COMMUNICATIONS) (REATTA & RIVIERA) 3

CHART D-2, SERIAL DATA CIRCUIT SHORTED TO VOLTAGE - REATTA & RIVIERA

1 article

• CHART D-2, SERIAL DATA CIRCUIT SHORTED TO VOLTAGE - REATTA & RIVIERA 4

CHART A-2, SERVICE ENGINE SOON LIGHT WILL NOT GO OUT OR FLASH - TORONADO & TROFEO

1 article

• CHART A-2, SERVICE ENGINE SOON LIGHT WILL NOT GO OUT OR FLASH - TORONADO & TROFEO 1

SELF-DIAGNOSTIC SYSTEM CHECK (NON-CRT TORONADO & TROFEO)

1 article

• SELF-DIAGNOSTIC SYSTEM CHECK (NON-CRT TORONADO & TROFEO) 5

CHART C, LOSS OF ECCP COMMUNICATIONS (NON-CRT EQUIPPED TORONADO & TROFEO)

1 article

• CHART C, LOSS OF ECCP COMMUNICATIONS (NON-CRT EQUIPPED TORONADO & TROFEO) 1

CHART D, LOSS OF COMMUNICATIONS (NON-CRT EQUIPPED TORONADO & TROFEO)

1 article

• CHART D, LOSS OF COMMUNICATIONS (NON-CRT EQUIPPED TORONADO & TROFEO) 3

CHART D-2, SERIAL DATA CIRCUIT SHORTED TO VOLTAGE (NON-CRT EQUIPPED TORONADO & TROFEO)

1 article

• CHART D-2, SERIAL DATA CIRCUIT SHORTED TO VOLTAGE (NON-CRT EQUIPPED TORONADO & TROFEO) 7

CHART C, COLOR CRT UNABLE TO CONTROL ECCP (CRT EQUIPPED TORONADO & TROFEO)

1 article

• CHART C, COLOR CRT UNABLE TO CONTROL ECCP (CRT EQUIPPED TORONADO & TROFEO) 1

CHART D, SERIAL DATA CIRCUIT OPEN (CRT EQUIPPED TORONADO & TROFEO)

1 article

• CHART D, SERIAL DATA CIRCUIT OPEN (CRT EQUIPPED TORONADO & TROFEO) 1

CHART D-1, GROUNDED SERIAL DATA CIRCUIT (CRT EQUIPPED TORONADO & TROFEO)

1 article

• CHART D-1, GROUNDED SERIAL DATA CIRCUIT (CRT EQUIPPED TORONADO & TROFEO) 3

CHART E, COLOR CRT ABNORMALITIES (CRT EQUIPPED TORONADO & TROFEO)

1 article

• CHART E, COLOR CRT ABNORMALITIES (CRT EQUIPPED TORONADO & TROFEO) 2

Note On Intermittents

1 article

• Note On Intermittents 3

CODE 23, MAT SENSOR SIGNAL VOLTAGE HIGH

1 article

• CODE 23, MAT SENSOR SIGNAL VOLTAGE HIGH 25

CODE 26, DIAGNOSTIC CIRCUIT CHECK

1 article

• CODE 26, DIAGNOSTIC CIRCUIT CHECK

SERVICE ENGINE SOON LIGHT INOPERATIVE

1 article

• SERVICE ENGINE SOON LIGHT INOPERATIVE

SERVICE ENGINE SOON LIGHT WON'T GO OUT OR FLASH CODE 12

1 article

• SERVICE ENGINE SOON LIGHT WON'T GO OUT OR FLASH CODE 12 1

Hot Light Diagnosis

1 article

• Hot Light Diagnosis 17

QDM CIRCUITS

1 article

• QDM CIRCUITS

Hot Light Diagnosis (C Body)

1 article

• Hot Light Diagnosis (C Body) 2

CODE 27 OR 28, GEAR SWITCH CIRCUITS - 3.3L WITH 3T40 TRANSAXLE

1 article

• CODE 27 OR 28, GEAR SWITCH CIRCUITS - 3.3L WITH 3T40 TRANSAXLE 1

CODE 28 OR 29, GEAR SWITCH CIRCUITS - 3.3L A BODY WITH 4T60

1 article

• CODE 28 OR 29, GEAR SWITCH CIRCUITS - 3.3L A BODY WITH 4T60 4

CODE 31, PARK/NEUTRAL SWITCH CIRCUIT - 3.3L & 3.8L

1 article

• CODE 31, PARK/NEUTRAL SWITCH CIRCUIT - 3.3L & 3.8L 3

Poor Connection or Damaged Harness

1 article

• Poor Connection or Damaged Harness

Intermittent Test

1 article

• Intermittent Test 14

CODE 39, TCC CIRCUIT 3.3L WITH 3T40 TRANSAXLE

1 article

• CODE 39, TCC CIRCUIT 3.3L WITH 3T40 TRANSAXLE 1

CODE 39, TCC CIRCUIT 3.3L & 3.8L WITH 4T60 (440-T4) TRANSAXLE

1 article

• CODE 39, TCC CIRCUIT 3.3L & 3.8L WITH 4T60 (440-T4) TRANSAXLE 33

CHART C-8, TORQUE CONVERTER CLUTCH ELECTRICAL DIAGNOSIS - 3.1L PFI A & J BODIES (2 OF 2)

1 article

• CHART C-8, TORQUE CONVERTER CLUTCH ELECTRICAL DIAGNOSIS - 3.1L PFI A & J BODIES (2 OF 2)

1st Gear

1 article

• 1st Gear

2nd Gear

1 article

• 2nd Gear

3rd Gear

1 article

• 3rd Gear 23

CHART C-8C, 4T60 TRANSAXLE 1ST GEAR SWITCH ELECTRICAL DIAGNOSIS - 3.4L PFI W BODY

1 article

• CHART C-8C, 4T60 TRANSAXLE 1ST GEAR SWITCH ELECTRICAL DIAGNOSIS - 3.4L PFI W BODY 7

CHART C-8B, 4T60 TRANSAXLE SHIFT SOLENOID FUNCTIONAL CHECK - 1991 E BODY (EXCEPT ELDORADO) 3.8L PFI (VIN L)

1 article

• CHART C-8B, 4T60 TRANSAXLE SHIFT SOLENOID FUNCTIONAL CHECK - 1991 E BODY (EXCEPT ELDORADO) 3.8L PFI (VIN L) 3

Transaxle Prefunctional Check

1 article

• Transaxle Prefunctional Check

No Indicator Lights On Or Ignition Indicator Light Only On

1 article

• No Indicator Lights On Or Ignition Indicator Light Only On

Battery Indicator Light On, All Other Indicator Lights Off

1 article

• Battery Indicator Light On, All Other Indicator Lights Off

Brake Indicator Light Not On

1 article

• Brake Indicator Light Not On

Shift "A" And/Or Shift "B" Indicator lights Not On

1 article

• Shift "A" And/Or Shift "B" Indicator lights Not On

Converter Clutch Apply Indicator Light On All The Time

1 article

• Converter Clutch Apply Indicator Light On All The Time

Converter Clutch MOD Indicator Light On All the Time

1 article

• Converter Clutch MOD Indicator Light On All the Time 1

CHART C-8B, 4T60 TRANSAXLE SHIFT SOLENOID FUNCTIONAL CHECK - 3.8L PFI (VIN L & 1) 1992

1 article

• CHART C-8B, 4T60 TRANSAXLE SHIFT SOLENOID FUNCTIONAL CHECK - 3.8L PFI (VIN L & 1) 1992 1

CHART C-8A, TORQUE CONVERTER CLUTCH FUNCTIONAL CHECK - 1992 3.8L PFI (VIN 1)

1 article

• CHART C-8A, TORQUE CONVERTER CLUTCH FUNCTIONAL CHECK - 1992 3.8L PFI (VIN 1) 1

CHART C-8B, 4T60 TRANSAXLE SHIFT SOLENOID FUNCTIONAL CHECK - 1992 3.8L PFI (VIN 1)

1 article

• CHART C-8B, 4T60 TRANSAXLE SHIFT SOLENOID FUNCTIONAL CHECK - 1992 3.8L PFI (VIN 1) 6

Diagnostics Aids

1 article

• Diagnostics Aids 5

CODE 23, MAT SENSOR TEMP. LOW - 1991 2.5L & 4.3L TURBO

1 article

• CODE 23, MAT SENSOR TEMP. LOW - 1991 2.5L & 4.3L TURBO 22

CODE 25, MAT SENSOR TEMP. HIGH - 1991 2.5L & 4.3L TURBO

1 article

• CODE 25, MAT SENSOR TEMP. HIGH - 1991 2.5L & 4.3L TURBO

CODE 25, MAT SENSOR TEMP. HIGH - 1992 2.5L & 4.3L TURBO

1 article

• CODE 25, MAT SENSOR TEMP. HIGH - 1992 2.5L & 4.3L TURBO 5

CODE 53, SYSTEM VOLTAGE HIGH - LT. TRUCK

1 article

• CODE 53, SYSTEM VOLTAGE HIGH - LT. TRUCK 1

Notes On Intermittents

1 article

• Notes On Intermittents 3

CODE 59, TRANSMISSION TEMPERATURE SENSOR CIRCUIT (LOW TEMPERATURE INDICATED) - LT. TRUCK

1 article

• CODE 59, TRANSMISSION TEMPERATURE SENSOR CIRCUIT (LOW TEMPERATURE INDICATED) - LT. TRUCK 5

CODE 75, SYSTEM VOLTAGE LOW - LT. TRUCK

1 article

• CODE 75, SYSTEM VOLTAGE LOW - LT. TRUCK 5

CODE 83, TCC QDM FAULT - LT. TRUCK

1 article

• CODE 83, TCC QDM FAULT - LT. TRUCK 3

CODE 86, SHIFT SOLENOID "B" STUCK "ON" - LT. TRUCK

1 article

• CODE 86, SHIFT SOLENOID "B" STUCK "ON" - LT. TRUCK 1

CODE 87, SHIFT SOLENOID "B" STUCK "OFF" - LT. TRUCK

1 article

• CODE 87, SHIFT SOLENOID "B" STUCK "OFF" - LT. TRUCK 25

TORQUE CONVERTER CLUTCH CIRCUIT CHECK - LT. TRUCK

1 article

• TORQUE CONVERTER CLUTCH CIRCUIT CHECK - LT. TRUCK 1

SHIFT SOLENOID "A" CIRCUIT CHECK - LT. TRUCK

1 article

• SHIFT SOLENOID "A" CIRCUIT CHECK - LT. TRUCK 1

SHIFT SOLENOID "B" CIRCUIT CHECK - LT. TRUCK

1 article

• SHIFT SOLENOID "B" CIRCUIT CHECK - LT. TRUCK 1

FORCE MOTOR CIRCUIT CHECK (LT. TRUCK)

1 article

• FORCE MOTOR CIRCUIT CHECK (LT. TRUCK) 20