SMU - SECTION 3 - CONTROL MODULE SYSTEMS - REVISED. GMC Truck GMC K Pickup

REVISION: 04/02/97

THIS BULLETIN IS BEING REVISED TO UPDATE DTC 78 STEP 3 DIAGNOSIS. PLEASE DISCARD CORPORATE BULLETIN NUMBER 61-65-19 (SECTION 3-CONTROL MODULE SYSTEMS). ----------------------------------------------------------------------

SUBJECT: SERVICE MANUAL UPDATE-SECTION 3-CONTROL MODULE SYSTEMS- REVISED DTC 78 WASTEGATE SOLENOID FAULT TREE CHART

MODELS: 1994-95 CHEVROLET AND GMC C/K, P3 MODELS WITH 6.5L ENGINE (VINS S, F - RPOS L56, L65)

THIS BULLETIN IS BEING ISSUED TO INFORM TECHNICIANS OF A REVISION TO DTC 78 WASTEGATE SOLENOID FAULT TREE CHART ON THE FOLLOWING SERVICE MANUAL PAGES:

* PAGE 3-109 (DIESEL SECTION) 1994-95 P3 AND PG DRIVEABILITY, EMISSIONS AND ELECTRICAL DIAGNOSIS SERVICE MANUAL BOOKS # NAPT-9440 AND GMT/95-PG-2 * PAGE 3-109 1994-95 C/K DRIVEABILITY, EMISSIONS AND ELECTRICAL DIAGNOSIS SERVICE MANUAL BOOKS # NAPT - 9442 AND GMT/95-PG-2 * PAGE 3-115 1995 C/K REPRINT DRIVEABILITY, EMISSIONS AND ELECTRICAL DIAGNOSIS SERVICE MANUAL BOOK # GMT/95-C/K-2F

TECHNICIANS ARE INSTRUCTED TO USE THE REVISED TREE CHART FOR FUTURE DIAGNOSIS.

FIGURES: 00 ATTACHMENTS: 01

Object Number: 77122 Size: FS

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.