LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 411 (Engine Controls - Basic Diagnostic Procedures - 3.8L) >> No-Start Diagnosis >> Engine Cranks But Does Not Run (Impala & Monte CARLO - VIN K) >> Diagnostic Procedure

Diagnostic Procedure

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. 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, P1630 or P1631 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. Check both sides of each of the Fuel Injectors and DFI Module fuses using a test light connected to 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. Turn ignition switch to RUN position, engine OFF. Observe the MIL. Is the MIL illuminated? If yes, go to next step. If no, go to step  12.
  5. Observe the engine speed parameter using a scan tool. Attempt to start the engine. 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.
  6. Command the fuel pump relay ON using a scan tool. Does the fuel pump run? If yes, go to next step. If no, go to FUEL PUMP ELECTRICAL CIRCUIT DIAGNOSIS (EXCEPT PARK AVENUE)  under FUEL SYSTEMS.
  7. Turn ignition switch to OFF position. Disconnect a spark plug wire. Install 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.
  8. Turn ignition switch to OFF position. Disconnect a fuel injector 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 step  10. If no, go to next step.
  9. Remove the Fuel Injector Test Light from the fuel injector harness connector. Turn ignition switch to RUN position, engine OFF. Probe the ignition 1 voltage supply circuit fuel injector using a test light connected to 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.
  10. 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.
  11. Check for the following conditions:
    • A collapsed air intake duct.
    • A restricted air filter element.
    • Fouled spark plugs. If the spark plugs are fouled, determine what caused the condition. Repair as necessary.
    • Engine mechanical condition such as a 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 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.

    Repair as necessary. After repair, go to step  15.

  12. Check the ignition 1 voltage circuit between the ABS/PCM fuse in the junction block-left Instrument Panel (IP) and the Powertrain Control Module (PCM) for an open. Did you find and correct the condition? If yes, go to step  15. If no, go to next step.
  13. Check for an intermittent and for a poor connection at the PCM. Repair as necessary. Did you find and correct the condition? If yes, go to step  15. If no, go to next step.
  14. Replace PCM. Program replacement PCM. See POWERTRAIN CONTROL MODULE under PROGRAMMING in SELF-DIAGNOSTICS - 3.8L BONNEVILLE, GRAND PRIX, IMPALA, LESABRE, MONTE CARLO, PARK AVENUE & REGAL article. After repair, go to next step.
  15. 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.
  16. Allow the engine to idle until normal operating temperature is reached. Observe the DTC Information using a scan tool. Are any DTCs displayed? If yes, go to 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.
scientia non olet · About LEMON Manuals