SCAN TOOL NOT CAPABLE OF DISPLAYING CRANKING RPM

VEHICLES AFFECTED: 1987 VEHICLES EQUIPPED WITH 2.0, 2.5L 4 CYLINDER AND 2.8L 6 CYLINDER VIN CODES 1, R, U AND W ENGINES

The attached pages are to be used when the SCAN tool you are using is not capable of displaying cranking RPM.

Some new generation equipment (eg. Tech 1) will display cranking RPM but the MPSI Multi-Scanner, even with the Model 8192 Converter will not.

Please note in your Service Manuals that these bulletin charts are to be used when cranking RPM can not be read via a SCAN tool.

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.