FALSE CODE 43 SET NEW SERVICE PROM P/N'S

MODEL AND YEAR: 1987 CELEBRITY, CAVALIER, CORSICA, BERETTA WITH 2.8L PFI ENGINE (CODE W)

Some 1987 Celebrity, Cavalier, Corsica, and Beretta models equipped with the 2.8L PFI engine may set a false code 43. The false code will be set under a deep, part throttle crowd between 3400 and 4400 engine RPM. As a result of setting this code, the "service engine soon" light will come on and generally will stay on until the ignition key is turned off. A Code 43 will be stored.

To service customer complaints, perform service diagnosis for Code 43 as defined in the Service Manual, Section 6E3, to correct any of the following conditions: faulty knock sensor, "intermittents", faulty connections, or open or shorted wiring problems.

To correct the Mem-Cal, a new part number Mem-Cal will be required.

The part numbers and model applications are listed on the reverse side of this bulletin. CELEBRITY --------- AXTLE EMISSION MEM-CALS MODEL TRANS. RATIO CALIBRATION PART NOS. ----- ----- ----- ----------- -------- 2DR/4DR AUTO-3 2.84 FED/CANADA 16072930 2DR/4DR AUTO-3 2.84 CALIFORNIA 16072942 2DR/4DR AUTO-3 3 .18 FED/CANADA 16072952 2DR/4DR AUTO-3 3.18 CALIFORNIA 16072963 2DR/4DR AUTO-4 3.33 FED/CANADA 16072973 2DR/4DR AUTO-4 3.33 CALIFORNIA 16072983 WAGON AUTO-4 3.33 FED/CANADA 16073023 WAGON AUTO-4 3.33 CALIFORNIA 16073130 WAGON AUTO-3 3 .18 FED/CANADA 16073003 WAGON AUTO-3 3.18 CALIFORNIA 16073013 2DR/4DR MAN-5 3.61 FEDERAL 16072993 2DR/4DR MAN-5 3.61 CALIFORNIA 16072997 WAGON MAN-5 3.61 FEDERAL 16073140 WAGON MAN-5 3.61 CALIFORNIA 16073145

CAVALIER

CONV AUTO-3 FEDERAL 16073192 CONV AUTO-3 CALIFORNIA 16073196 CONV MAN-5 FEDERAL 16073212 CONV MAN-5 CALIFORNIA 16073216 Z-24 AUTO-3 FEDERAL 16073202 Z-24 AUTO-3 CALIFORNIA 16073206 Z-24 MAN-5 FEDERAL 16073222 Z-24 MAN-5 CALIFORNIA 16073226

BERETTA G.T. ONLY ----------------- G.T. AUTO-3 3 .18 FEDERAL 16073150 G. T. AUTO-3 3 .18 CALIFORNIA 16073155 G. T. MAN-5 3.61 FEDERAL 16073182 G.T. MAN-5 3.61 CALIFORNIA 16073186

BERETTA/CORSICA (EXCEPT BERETTA GT) ----------------------------------- 2DR/4DR AUTO-3 3 .18 FEDERAL 16073162 2DR/4DR AUTO-3 3 .18 CALIFORNIA 16073166 2DR/4DR MAN-5 3.61 FEDERAL 16073172 2DR/4DR MAN-5 3.61 CALIFORNIA 16073176

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.