SMU - SECTION 3 - DRIVEABILITY AND EMISSIONS. GMC Truck GMC Suburban

SUBJECT: SMU-SECTION 3-DRIVEABILITY AND EMISSIONS-DIAGNOSTIC UPDATE FOR DTC'S 17 AND 18

MODELS: 1994 CHEVROLET AND GMC TRUCK C/K, G, P MODELS WITH 6.5L DIESEL ENGINES (VINS F, P, S- RPOS L65, L49, L56)

THIS INFORMATION SHOULD BE INSERTED IN THE FACING PAGES OF DTC'S 17 AND 18 UNDER DIAGNOSTIC AIDS.

**DIAGNOSTIC AIDS:** WITH THE ELECTRONIC HARNESS FILTER REMOVED FROM THE VEHICLE, IT SHOULD BE CHECKED FOR OPENS, TERMINAL CONTACT/TENSION AND FOR HIGH RESISTANCE. RESISTANCE ON CIRCUIT 474 (TERMINAL "A" GRAY WIRE) SHOULD BE APPROXIMATELY 2.0 OHM. A "SUSPECT" ELECTRONIC HARNESS FILTER CAN ALSO BE CHECKED FOR FAILURES AT HIGHER TEMPERATURES OR BY APPLYING PRESSURE WITH YOUR FINGERS TO THE PROTECTIVE RUBBER CASING WHILE THE VOLTMETER IS STILL CONNECTED.

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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.