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

MODELS AFFECTED: 1987-89 SKYHAWK WITH 2.0L ENGINE (VIN CODE 1) 1987 CENTURY WITH 2.8L ENGINE (VIN CODE W) 1988 REGALS WITH 2.8L (VIN CODE W) OR 3.1L (VIN CODE T) ENGINES

YEAR ENGINE CARLINES SECTION TEXT ---- ------ -------- ------- ---- 1987-89 2.0L Skyhawk Chart A-3 Page 2 of 3

1987 2.8L Century Chart A-3 Page 3 of 3

1988-90 2.8L/3.1L Regal 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.