SMU - SECTION 6E3 - DRIVEABILITY & EMISSIONS

SUBJECT: SERVICE MANUAL UPDATE-SECTION 6E3-DRIVEABILITY AND EMISSIONS-REVISED DTC P1520 PARK NEUTRAL POSITION (PNP) SWITCH CIRCUIT

MODELS: 1996 BUICK CENTURY 1996 CHEVROLET BERETTA, CORSICA 1996 OLDSMOBILE CUTLASS CIERA

1996-97 CHEVROLET AND GMC TRUCK S MODELS WITH 2.2L ENGINE (VIN 4 - RPO LN2)

THIS BULLETIN IS BEING ISSUED TO REVISE THE DTC P1520 PARK NEUTRAL POSITION (PNP) SWITCH CIRCUIT TABLE IN THE FOLLOWING SERVICE MANUALS:

* 1996 GMP/96-L-2 * 1996 GMP/96-A-2 * 1996 GMT/96-ST-2 * 1997 GMT/97-ST-2

A REVISED COPY OF THE DIAGNOSTIC TABLE IS ATTACHED. ALSO ADD THE FOLLOWING DIAGNOSTIC:

DTC P1520 DIAGNOSTIC AIDS

* AN INTERMITTENT PROBLEM MAY BE CAUSED BY A POOR CONNECTION, RUBBED THROUGH WIRE INSULATION, OR A WIRE THAT IS BROKEN INSIDE THE INSULATION.

* ANY CIRCUITRY THAT IS SUSPECTED AS CAUSING THE INTERMITTENT CONCERN SHOULD BE THOROUGHLY CHECKED FOR THE FOLLOWING CONDITIONS:

- BACKED OUT TERMINALS - IMPROPER MATING - BROKEN LOCKS - IMPROPERLY FORMED OR DAMAGED TERMINALS - POOR TERMINAL TO WIRING CONNECTIONS - PHYSICAL DAMAGE TO THE WIRING HARNESS

PLEASE MARK UP YOUR SERVICE MANUAL WITH THIS REVISION.

FIGURES: 00 ATTACHMENTS: 08

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 1996 GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.