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Diagnostic Procedure

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  1. Perform Diagnostic System Check - Engine Controls. See 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. After performing Diagnostic System Check - Engine Controls, go to next step.
  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 fuel injector fuse. Is the fuel injector 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 a fuel injector harness connector. 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 next step. If no, go to step  6.
  5. Check 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. Check for poor connections at the fuel injectors harness connector. 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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