For 1990-2009 cars

# SMU-SECTION 8A-ELECTRICAL DIAGNOSIS - NEW DIAGNOSTIC

#### SUBJECT: SERVICE MANUAL UPDATE - SECTION 8A - ELECTRICAL DIAGNOSIS - NEW DIAGNOSTIC TABLES FOR VEHICLE SPEED SENSOR SIGNAL CIRCUIT

#### MODELS: 1996-97 BUICK SKYLARK 1996 CHEVROLET BERETTA, CORSICA 1996-97 CHEVROLET CAVALIER 1997 CHEVROLET MALIBU 1996-97 OLDSMOBILE ACHIEVA 1997 OLDSMOBILE CUTLASS 1996-97 PONTIAC GRAND AM, SUNFIRE 1996-97 TOYOTA CAVALIER

THIS BULLETIN IS BEING ISSUED TO ADD NEW DIAGNOSTIC TABLES TO SECTION 8A OF THE SERVICE MANUAL.

THE ATTACHED TABLES DESCRIBE THE DIAGNOSTIC PROCEDURES FOR THE DIAGNOSIS OF THE VEHICLE SPEED SENSOR SIGNAL CIRCUIT FROM THE POWERTRAIN CONTROL MODULE (PCM) TO AUXILIARY DEVICES. PLEASE INSERT THE ATTACHED DIAGNOSTIC TABLES INTO THE ELECTRICAL DIAGNOSIS INSTRUMENT CLUSTER SECTION (CELL 80 - J/L/N CARS; CELL 81 L/N CARS) OF THE SERVICE MANUAL.

FIGURES: 00 ATTACHMENTS: 28

GENERAL MOTORS BULLETINS ARE INTENDED FOR USE BY PROFESSIONAL TECHNICIANS, NOT A "DO-IT-YOURSELFER". THEY ARE WRITTEN TO INFORM THOSE TECHNICIANS OF CONDITIONS THAT MAY OCCUR ON SOME VEHICLES, OR TO PROVIDE INFORMATION THAT COULD ASSIST IN THE PROPER SERVICE OF A VEHICLE. PROPERLY TRAINED TECHNICIANS HAVE THE EQUIPMENT, TOOLS, SAFETY INSTRUCTIONS AND KNOW-HOW TO DO A JOB PROPERLY AND SAFELY. IF A CONDITION IS DESCRIBED, DO NOT ASSUME THAT THE BULLETIN APPLIES TO YOUR VEHICLE, OR THAT YOUR VEHICLE WILL HAVE THAT CONDITION. SEE A GENERAL MOTORS DEALER SERVICING YOUR BRAND OF GENERAL MOTORS VEHICLE FOR INFORMATION ON WHETHER YOUR VEHICLE MAY BENEFIT FROM THE INFORMATION.

COPYRIGHT 1997 GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.