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Diagnostic Procedure (Regal)

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  1. If diagnostic system check has already been performed, go to next step. If diagnostic system check has not been performed, go to DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 3.8L BONNEVILLE, GRAND PRIX, IMPALA, LESABRE, MONTE CARLO, PARK AVENUE & REGAL article.
  2. Are any fuel injector DTCs set? If yes, go to DTC P0201-P0206: INJECTOR CONTROL CIRCUIT under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 3.8L BONNEVILLE, GRAND PRIX, IMPALA, LESABRE, MONTE CARLO, PARK AVENUE & REGAL article. If no, go to next step.
  3. Check the F/INJR fuse No. 28 (15-amp), located in underhood junction block. Is the F/INJR fuse open? If yes, go to next step. If no, go to step  5.
  4. Turn ignition switch to OFF position. Disconnect a fuel injector harness connector. Turn ignition switch to RUN position, engine OFF. Probe the fuel injector ignition 1 voltage supply circuit using a test light connected to battery voltage. Does the test light illuminate? If yes, go to step  6. If no, go to DIAGNOSTIC AIDS .
  5. Turn ignition switch to OFF position. Disconnect a fuel injector harness connector. Turn ignition switch to RUN position, engine OFF. Probe the fuel injector ignition 1 voltage supply circuit using a test light connected to a good ground. Does the test light illuminate? If yes, go to DTC P0341: CAMSHAFT POSITION SENSOR PERFORMANCE under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 3.8L BONNEVILLE, GRAND PRIX, IMPALA, LESABRE, MONTE CARLO, PARK AVENUE & REGAL article. If no, go to step  7.
  6. Check each fuel injector ignition 1 voltage supply circuit for a short to ground. Replace the F/INJR fuse. After repair, go to step  8.
  7. Repair the open or poor connection in the fuel injector ignition 1 voltage supply circuit. After repair, go to next step.
  8. Operate the system to verify the repair. Did you correct the condition? If yes, system is okay at this time. If no, go to step  3.
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