SERVICE MANUAL UPDATE SEC. 6E3-REVISED CODE 26 CHART

VEHICLES AFFECTED: 1989 A CARS W/3300 VIN N ENG AND 4T60 TRANS.

This bulletin serves to update Code 26 diagnostic chart in Section 6E3 "Driveability and Emissions" for the 1989 A Models with 3300 (VIN N) and 440-T4 (4T60) Transmission.

The Revised Diagnostic Chart now requires ENGINE RUNNING in "CLOSED LOOP" with "Scan" Tool installed.

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.