SMU-SEC. 3A & 9B - ENG. CONTR. REV. DTC 32. GMC Truck Sonoma Pickup

SUBJECT: SERVICE MANUAL UPDATE - SECTION 3A AND 9B - ENGINE CONTROLS REVISED DTC 32 AND EGR SYSTEM CHECK CHARTS

MODELS: 1994-95 CHEVROLET AND GMC S MODEL WITH 2.2L ENGINE (VIN 4 - RPO LN2)

THIS BULLETIN REVISES THE DTC 32 CHART AND THE EGR SYSTEM CHECK CHART FOR THE FOLLOWING SERVICE MANUALS:

* 1994 NATP -9444, PAGES 3A-99 AND 9B-4 * 1995 GMT/95-S/T-2, PAGES 3A-99 AND 9B-5

ATTACHED ARE REVISED CHARTS FOR DTC 32 CHART EXHAUST GAS RECIRCULATION (EGR) ERROR 2.2L (VIN 4) AND EGR SYSTEM CHECK WITH NEGATIVE BACKPRESSURE EGR VALVE.

THE UPDATES INCORPORATE NEW CORRECTIONS AND IMPROVED DIAGNOSTIC PROCEDURES.

PLEASE UPDATE YOUR SERVICE MANUAL WITH THESE REVISIONS.

FIGURES: 00 ATTACHMENTS: 02

Object Number: 336106 Size: FS

Object Number: 336108 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.