SERVICE MANUAL UPDATE ENGINE CRANK BUT WON'T RUN

THIS BULLETIN SUPERSEDES ALL INFORMATION CONTAINED IN PREVIOUSLY RELEASED BULLETIN, CORPORATE REFERENCE NUMBER 816525.

THIS BULLETIN HAS BEEN REVISED TO REVISE CHART A-3 (PAGE 2 OF 3),"ENGINE CRANKS BUT WON'T RUN", USED IN THE DIAGNOSIS OF 1987 THROUGH 1989 "N" CARLINE (VIN U) AND "A" CARLINE (VIN R) WITH 2.5L ENGINES.

WHEN MEASURING CRANKSHAFT SENSOR RESISTANCE, AS DESCRIBED IN "TEST DESCRIPTION" STEP NUMBER 5, MAKE CERTAIN THE CRANKSHAFT SENSOR IS AT ROOM TEMPERATURE. HIGH RESISTANCE READINGS COULD RESULT IF THE CRANKSHAFT SENSOR IS WARMER THAN ROOM TEMPERATURE.

ALSO, A "DIAGNOSTIC AIDS" SECTION HAS BEEN ADDED TO THE FACING PAGE WHICH ADDRESSES THE CORRECTION PROCEDURE FOR AN INTERMITTENT CRANKSHAFT SENSOR CONDITION. THE DIAGNOSTIC CHART HAS BEEN UPDATED TO REFLECT THIS CHANGE AS WELL.

DISCLAIMER

COPYRIGHT 1988 GENERAL MOTORS CORPORATION ALL RIGHTS RESERVED

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.