SMU-SEC. 6E - ENG. CONTR. REV. DTC. P0137,P0172. GMC Truck GMC C Pickup

SUBJECT: SERVICE MANUAL UPDATE - SECTION 6E - ENGINE CONTROLS REVISED DTC PO137, PO172 AND DTC PO420

MODELS: 1996-97 CHEVROLET AND GMC C/K MODELS WITH 4.3L, 5.0L/5.7L, 7.4L ENGINE (VINS W, M, R, J - RPOS L35, L30, L31, L29)

DTC PO137 - CHANGE STEP 2 NO ANSWER TO "GO TO STEP 4" IN THE FOLLOWING SERVICE MANUALS: 1996 C/K TRUCK BOOK 2, PAGES 6E-117 AND 6E-570 1997 C/K TRUCK BOOK 2, PAGES 6E-125 AND 6E-621

DTC PO172 - CHANGE STEP 12 HO2S REFERENCE TO "BANK 1 SENSOR 1" IN THE FOLLOWING SERVICE MANUALS: 1996 C/K TRUCK BOOK 2, PAGES 6E-160 AND 6E-627 1997 C/K TRUCK BOOK 2, PAGES 6E-169 AND 6E-678

DTC PO420 - CHANGE STEP 6 NO ANSWER TO "GO TO STEP 7" IN THE FOLLOWING SERVICE MANUALS: 1996 C/K TRUCK BOOK 2, PAGES 6E-220 AND 6E-696 1997 C/K TRUCK BOOK 2, PAGES 6E-229 AND 6E-748

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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.