CODE 34 DIAGNOSTIC PROCEDURE POSSIBLE PROM REPLACEMENT

This information applies to Federal and California 1982 J2000 and California only 1982 T1000 with manual transmissions and 1982 Phoenix and Firebird with manual transmission and 2.8L V-6 engines (engine code X in Phoenix and Code 1 in Firebird).

When diagnosing a vehicle exhibiting a code 34 (map sensor), the diagnostic charts in Section 6E of the Service Manual should be followed. If the diagnostic chart indicates the map sensor is functioning properly, a new PROM should be installed as shown on the attached chart. This PROM has been calibrated to prevent a code 34 from being set when the map sensor is functioning properly.

NOTICE: The ECM part number of the 1982 J2000 will have to be known in order to select the proper replacement PROM. This number is located in the upper right hand corner of the ECM identification label. This label is located on the ECM, next to the PROM access window.

SERVICE PROM APPLICATION CHART Service PROM Model ECM Part Number* Package ----- ---------------- ------- *See Notes A and B at End of Chart

1982 Firebird

2.8L V-6, Federal Emission System 16025371 (A) 1225916

1982 T1000

1.6L L-4, California Emission System 16017171 (A) 1225566

1982 Phoenix

2.8L V-6, Federal Emission System 16017191 (A) 1225767

1982 J2000

All models with 4:10 Axle 16026231 (A) 1225752

Station Wagon

- With A/C 16020521 (A) 1225754 16023801 (B) 1226718 16018211 (B) 1226718

- Without A/C 16020531 (A) 1225755 16023811 (B) 1226719 16018251 (B) 1226719

Two Door Notchback

- With A/C 16020381 (A) 1225757 16023761 (B) 1226716 16018161 (B) 1226716

- Without A/C

. Federal w/Manual Steering 16020541 (A) 1225756 . Federal w/Power Steering 16020391 (A) 1225589 . All California 16020391 (A) 1225589

Two Door Hatchback

- With A/C 16020381 (A) 1225757 16023761 (B) 1226716 16018161 (B) 1226716

- Without A/C

. With Power Steering 16020391 (A) 1225589 16023771 (B) 1226717 16018201 (B) 1226717

. With Manual Steering 16023821 (B) 1226720 16018101 (B) 1226720

Service PROM Model ECM Part Number* Package ----- ---------------- ------- Four Door Notchback

- With A/C 16020381 (A) 1225757 16023761 (B) 1226716 16018161 (B) 1226716

- Without A/C

. With Power Steering 16020391 (A) 1225589 16023771 (B) 1226717 16018201 (B) 1226717 . With Manual Steering 16023821 (B) 1226720 16018101 (B) 1226720

NOTE A: This ECM may have been replaced by service ECM, Part Number 16019710 (1225500).

NOTE B: This ECM may have been replaced by service ECM, Part Number 16018000 (1225330).

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.