SMU - SECTION 3A & 3B - CONTROL MODULE SYSTEM. GMC Truck Safari

SUBJECT: SERVICE MANUAL UPDATE-SECTIONS 3A AND 3B- CONTROL MODULE SYSTEM (PCM), (ECM/EFI4) AND (VCM-A) REVISED CHART A-8 INJECTOR COIL TEST

MODELS: 1994-95 CHEVROLET AND GMC TRUCK C/K, S/T MODELS 1994 OLDSMOBILE BRAVADA WITH 4.3L ENGINE (VIN W-RPO L35)

THIS BULLETIN IS BEING ISSUED TO ADVISE TECHNICIANS OF A REVISION TO CHART A-8 INJECTOR COIL TEST AND THE EXAMPLE BOX ON THE FACING PAGE. THE FOLLOWING SERVICE MANUAL PAGES ARE BEING AFFECTED:

* 1994 M/L DRIVEABILITY EMISSIONS AND ELECTRICAL DIAGNOSIS MANUAL PAGES 3A-38, 3A-39 * 1995 M/L DRIVEABILITY EMISSIONS AND ELECTRICAL DIAGNOSIS MANUAL PAGES 3A-32, 3A-33 * 1994 S/T DRIVEABILITY EMISSIONS AND ELECTRICAL DIAGNOSIS MANUAL PAGES 3A-58, 3A-59, 3B-32, 3B-33 * 1995 S/T DRIVEABILITY EMISSIONS AND ELECTRICAL DIAGNOSIS MANUAL PAGES 3A-56, 3A-57, 3B-36, 3B-37 * 1994 S/T SERVICE MANUAL SUPPLEMENT (WITH RPO CTF) PAGES 3A-32, 3A-33 * 1994 T-TRUCK SERVICE MANUAL SUPPLEMENT (OLDSMOBILE BRAVADA) PAGES 6E3-A-35A, 6E3-A-35B

* IN CHART A-8 INJECTOR COIL TEST, THE AMP READING IN #1 BOX OF THE TREE CHART SHOULD READ 2.5 AMP.

* IN CHART A-8 INJECTOR COIL TEST, THE VOLTAGE READING IN #2 BOX OF THE TREE CHART SHOULD READ 3.3 - 4.8 VOLTS.

* IN THE EXAMPLE BOX ON THE FACING PAGE AT 50 DEGREES F TO 95 DEGREES F THE RESISTANCE SHOULD READ 1.9 TO 2.1 OHMS AND THE VOLTAGE SHOULD BE AT 3.3 - 4.8 VOLTS.

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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.