SERVICE ENGINE SOON LIGHT CODE 43 (REPLACE TERMINAL)

Subject: SERVICE ENGINE SOON LIGHT MAY SET CODE 43 (REPLACE TERMINAL)

Models Affected: 1990 GRAND PRIX MODELS WITH 2.3L ENGINE (VIN CODE D)

CONDITION:

---------- The "Service Engine Soon" light may come on and set a Code 43, on 1990 Grand Prix models with 2.3L engine (VIN Code D) The cars may have decreased performance when the code is set.

CAUSE:

------ The terminal in the connector to the spark knock sensor may be improperly formed. This condition is limited to early built 1990 models.

CORRECTION:

----------- Remove the connector from the spark knock sensor and inspect the male terminal in the connector. If the terminal appears normal, use a replacement female terminal to check for proper tension. If the tension is not normal (the female terminal falls out when held upside-down) , or if the terminal appears to be flattened, replace the terminal and seal. P/N 12121037 contains both the terminal and seal.

Parts are currently available from GMSPO.

Warranty Information: Use existing labor operation.

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.