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Diagnostic Procedure (Grand Prix)

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 Pontiac Grand Prix, 2003 Pontiac Bonneville, 2003 Chevrolet Monte Carlo, 2003 Chevrolet Impala, and 2003 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  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 INJ fuse No. 18 (10-amp), located in the underhood junction block. Is the INJ fuse open? If yes, go to next step. If no, 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.
  4. Turn ignition switch to OFF position. Disconnect the fuel injector multi-way harness connector. Probe the fuel injector ignition 1 voltage supply circuit, fuse side, using a test light connected to battery voltage. Does the test light illuminate? If yes, go to next step. If no, go to step  6.
  5. Test the fuel injector ignition 1 voltage supply circuit, between the fuel injector fuse and the fuel injectors for a short to ground. Did you find and correct the condition? If yes, go to step  7. If no, go to DIAGNOSTIC AIDS .
  6. Inspect for poor connections at the fuel injector harness connectors. Did you find and correct the condition? If yes, go to next step. If no, go to DIAGNOSTIC AIDS .
  7. 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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