SERVICE MANUAL UPDATE ECM IDENTIFICATION/DIAGNOSTICS

SERVICE MANUAL USAGE - 1988 CHEVROLET CORSICA/BERETTA SERVICE MANUAL SUPPLEMENT ST-374-885

VEHICLES AFFECTED SOME 1988 PONTIAC TEMPEST WITH ----------------- 2.0L ENGINE (VIN CODE 1)

A running change was made to the ECM on some 1988 Pontiac Tempest with 2.0L engine. If the ECM has two connectors, it will be necessary to use the 1988 Chevrolet Corsica/Beretta Service Manual Supplement (ST-374-885) for vehicles with driveability or emission conditions. If the ECM has three connectors, use the 1987 Tempest Service Manual.

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.