SERVICE MANUAL UPDATE SEC. 5E1 ABS-DIAG. REVISED SENSOR TEST

SUBJECT: SERVICE MANUAL UPDATE - SECTION 5El - ABS DIAGNOSIS - REVISED FRONT WHEEL SPEED SENSOR RESISTANCE VALUES

VEHICLES AFFECTED: 1991 "Y" -------------------

This bulletin serves to update the 1991 Corvette Service Manual, Section 5El "Antilock Brake System Diagnosis" Code 21 and Code 25 diagnostic charts.

The resistance specification used in the diagnostic charts should be 990-1210 ohms, as shown in the attached corrected service manual pages 5El-25 and 5El-29. Please update your 1991 service manual accordingly.

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.