SERVICE MANUAL UPDATE SEC. 6E3 DRIVEABILITY & EMISSIONS

SUBJECT: SERVICE MANUAL UPDATE - SECTION 6E3-DRIVEABILITY AND EMISSIONS ECM TERMINAL PIN CHANGES

VEHICLES AFFECTED: 1990-91 "F" 5.0L, 5.7L (VIN F,8)

This bulletin serves to revise information found in the 1990-1991 5.0L (VIN F) and 5.7L (VIN 8) "F" Carline Service Manual, "Driveability And Emissions" Section 6E3.

The information in this bulletin reflects a change with the EGR circuit ECM Terminal Pin "GF9". The ECM Terminal Pin "GF9" should be shown as "GE9" on the pages listed below.

1990 6E3-A-5 Figure A-4, ECM Wiring Diagram 6E3-A-40 Code 32 Exhaust Gas Recirculation (EGR) Circuit 6E3-C7-4 Chart C-7 Exhaust Gas Recirculation (EGR) Check

1991 6E3-A-40 Code 32 Exhaust Gas Recirculation (EGR) Circuit 6E3-C7-4 Chart C-7 Exhaust Gas Recirculation (EGR) Check

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.