SERVICE MANUAL UPDATE SEC. 6E-DRIVEABILITY & EMISS.

Models Affected: 1987-90 6000 AND GRAND PRIX MODELS WITH 2.8 and 3.1

YEAR VIN ENGINE CARLINES SECTION TEXT ---- --- ------ --------- ------- ---- 1987-90 W/T 2.8L/3.1L 6000 Chart A-3 Page 3 of 3

1988-90 W/T 2.8L/3.1L GRAND PRIX Chart A-3 Page 3 of 3

The following crank sensor voltage output specifications have been updated for applications listed above. This updated information should be noted in the appropriate "Engine Cranks But Will Not Run" Chart A-3, in the "Driveability And Emissions" Section "6E" of the Service Manual.

Normal crank sensor voltage output range (room temperature/charged battery) .8 volt (800 mv) - 1.4 volts (1400 mv).

Minimum crank sensor voltage output (slow cranking/low battery) .3 volt (300 mv).

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.