REVISED ELECTROMATIC DIAGNOSIS CHART-JATCO AUTO.TRANSMISSION

SUBJECT: REVISED ELECTROMATIC CORE DIAGNOSIS/INFORMATION FORMS

MODELS: 1988-1990 W4 EQUIPPED WITH JATCO ELECTROMATIC A/T TRANSMISSIONS (RPO MC1)

THIS BULLETIN CANCELS AND REPLACES GMC TRUCK SERVICE BULLETIN 90-7A-58, DATED MAY, 1990 TO UPDATE THE DIAGNOSIS FORM. ALL COPIES OF 90-7A-58 SHOULD BE DISCARDED.

SERVICE INFORMATION

The revised Electromatic Core Diagnosis/information form is available through Retail Publications free of charge in packets of 25. The new form order number is IST SVC 180 11.90.

Retail Publications 15 Whatney Irvine, CA 92718 Attn. Isuzu Coordinator (714) 770-3497

A copy of the new ELECTROMATIC CORE DIAGNOSIS/INFORMATION form is attached to this bulletin. The new form replaces the current Electromatic Diagnosis Form IST SVC 180 11.89. The new form MUST BE FULLY COMPLETED and returned with each transmission core.

Please note that the technician still must follow diagnostic procedures outlined in the workshop manual and results must be clearly identified on the repair order.

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.