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Diagnostic Procedure

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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. Turn ignition switch to RUN position, engine OFF. Observe the DTC information using a scan tool. Is DTC P0101, P0123, P0230, P0336, P0341, P0601, P0602, P1626, P1631 or P2610 set? If yes, diagnose affected DTC(s). See DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - 3.8L BONNEVILLE, GRAND PRIX, IMPALA, LESABRE, MONTE CARLO, PARK AVENUE & REGAL article. If no, go to next step.
  3. Turn ignition switch to RUN position, engine OFF. Probe both sides of the INJ and ELEK fuses using a test light connected to a good ground. Does the test light illuminate on at least one side of each fuse? If yes, go to next step. If no, see IGNITION RELAY DIAGNOSIS  under IGNITION SYSTEMS.
  4. Observe the engine speed parameter using a scan tool, while the engine is cranking. Does the engine speed parameter display cranking RPM? If yes, go to next step. If no, go to ELECTRONIC IGNITION SYSTEM DIAGNOSIS  under IGNITION SYSTEMS.
  5. Command the fuel pump relay ON using a scan tool. Does the fuel pump turn ON? If yes, go to next step. If no, go to FUEL PUMP ELECTRICAL CIRCUIT DIAGNOSIS (EXCEPT PARK AVENUE)  under FUEL SYSTEMS.
  6. Turn ignition switch to OFF position. Disconnect a spark plug wire. Install the Spark Tester (J 26792), or equivalent, to the spark plug wire. Attempt to start the engine. Does the spark tester spark? If yes, go to next step. If no, go to ELECTRONIC IGNITION SYSTEM DIAGNOSIS  under IGNITION SYSTEMS.
  7. Turn ignition switch to OFF position. Disconnect a fuel injector harness connector. Install Fuel Injector Test Light (J 34730-405), or equivalent, to the fuel injector harness connector. Attempt to start the engine. Does the test light blink while the engine is cranking? If yes, go to next step. If no, go to FUEL INJECTOR CIRCUIT DIAGNOSIS  under FUEL SYSTEMS.
  8. Turn ignition switch to OFF position. Install Fuel Pressure Gauge (J 34730-1A), or equivalent. See Figure. Turn ignition switch to RUN position, engine OFF. Command the fuel pump relay ON using a scan tool. Is the fuel pressure 53-59 psi (364-405 kPa) while the fuel pump is operating? If yes, go to next step. If no, go to FUEL SYSTEM DIAGNOSIS  under FUEL SYSTEMS.
  9. Check for the following conditions:
    • Collapsed air intake duct.
    • Restricted air filter element.
    • Fouled spark plugs. If the spark plugs are fouled, determine what caused the condition. Repair as necessary.
    • Engine mechanical condition (worn timing chain and gears, low compression, etc.). See appropriate article in ENGINES.
    • Restricted exhaust system. See RESTRICTED EXHAUST under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - 3.8L BONNEVILLE, GRAND PRIX, IMPALA, LESABRE, MONTE CARLO, PARK AVENUE & REGAL article.
    • Faulty Engine Coolant Temperature (ECT) sensor. See ENGINE COOLANT TEMPERATURE SENSOR under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - 3.8L BONNEVILLE, GRAND PRIX, IMPALA, LESABRE, MONTE CARLO, PARK AVENUE & REGAL article.
    • Faulty Manifold Absolute Pressure (MAP) sensor. See MANIFOLD ABSOLUTE PRESSURE SENSOR under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - 3.8L BONNEVILLE, GRAND PRIX, IMPALA, LESABRE, MONTE CARLO, PARK AVENUE & REGAL article.
    • Stuck Throttle Position (TP) sensor. See DTC P0121: TP SENSOR PERFORMANCE under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 3.8L BONNEVILLE, GRAND PRIX, IMPALA, LESABRE, MONTE CARLO, PARK AVENUE & REGAL article.

    After completing the actions, go to next step.

  10. Clear DTCs using a scan tool. Attempt to start the engine. Does the engine start and continue to operate? If yes, go to next step. If no, go to step  2.
  11. Allow engine to idle until normal operating temperature is reached. Observe the DTC Information on scan tool. Are any DTCs displayed? If yes, diagnose affected DTC(s). See DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - 3.8L BONNEVILLE, GRAND PRIX, IMPALA, LESABRE, MONTE CARLO, PARK AVENUE & REGAL article. If no, system is okay at this time.
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