BODY CODE IDENTIFICATION
| Body Code | Model |
|---|---|
| A | Century, Cutlass Ciera, Cutlass Cruiser |
| B | Caprice |
| C | Ninety-Eight, Park Avenue |
| E | Eldorado, Riviera |
| F | Camaro, Firebird |
| H | Bonneville, Eighty-Eight, LeSabre |
| J | Cavalier, Sunbird |
| L | Beretta, Corsica |
| N | Achieva, Grand Am, Skylark |
| W | Cutlass Supreme, Grand Prix, Lumina, Regal |
BODY CODE IDENTIFICATION
Scheme 41
- Install Tech 1 scan tester. Disconnect boost control solenoid harness connector. Turn ignition on, engine off. Connect test light between boost control solenoid harness connector terminal "A" and ground. (Scheme 41) Test light should illuminate. If test light illuminates, go to step 3). If test light did not illuminate, go to next step.
- Check 15-amp engine control fuse. If fuse is blown, check for a shorted circuit between fuse and boost control solenoid. If fuse is okay, check for an open circuit between fuse and boost control solenoid. (Scheme 41) Repair as necessary.
- Connect test light between boost control solenoid harness connector terminals "A" and "B". (Scheme 41) Test light should not illuminate. If test light did not illuminate, go to next step. If test light illuminated, go to step 5).
- Turn ignition off. Disconnect PCM Green connector. Turn ignition on. If test light illuminated, check for shorted circuit between PCM terminal GC9 and boost control solenoid terminal "B". (Scheme 41) If test light did not illuminate, replace PCM.
- Using Tech 1 scan tester, select boost control output test under miscellaneous tests. Turn on boost control solenoid using Tech 1. Test light should illuminate when boost control solenoid is turned on. If test light did not illuminate, go to next step. If test light illuminated, go to step 7).
- Connect a test light to battery positive. Using test light, backprobe PCM terminal GC9. Turn on boost control solenoid using Tech 1. If test light illuminated, check for open in circuit between PCM terminal GC9 and boost control solenoid terminal "B". (Scheme 41) If test light did not illuminate, check for poor connection at PCM or for a faulty PCM.
- Reconnect boost control solenoid harness connector. Disconnect boost signal hose between boost control solenoid and by-pass valve actuator. Connect vacuum gauge and read boost signal from solenoid. With transmission in Park, start and idle engine. If vacuum is not present, check circuit for poor connections to solenoid or for faulty solenoid. If vacuum was present, go to next step.
- Using Tech 1 scan tester, turn off boost control solenoid. Observe vacuum gauge. Vacuum reading should be approximately 15 in. Hg. If vacuum reading is as specified, go to next step. If vacuum reading is not as specified, check for restriction in boost source to boost control solenoid. If restriction is not found, replace boost control solenoid.
- Check for restriction in boost signal hose between boost control solenoid and by-pass valve actuator. Repair as necessary. If restriction is not found, boost control solenoid is functioning normally.