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Home >> Saturn >> 2003 >> LW200 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0201-P0204: Injector Control Circuit >> Diagnostic Procedures
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Diagnostic Procedures

  1. Did you perform the Diagnostic System Check - Engine Controls? If yes, go to next step. If no, go to DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Frame/Failure Records for this DTC. Turn ignition off for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC. See CONDITIONS FOR RUNNING DTC . You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition? If yes, go to next step. If no, go to DIAGNOSTIC AIDS .
  3. Turn ignition off. Remove the air cleaner outlet resonator. Disconnect the fuel injector. Turn ignition on, with engine off. Probe the ignition 1 voltage circuit of the fuel injector with a test light that is connected to a good ground. Does the test light illuminate? If yes, go to next step. If no, go to step  10.
  4. Connect the Injector Test Light (J 34730-405) between the control circuit and the ignition 1 voltage circuit of the fuel injector. Start engine. Does the test light flash? If yes, go to step  8. If no, go to next step.
  5. Does the test light remain illuminated at all times? If yes, go to step  7. If no, go to next step.
  6. Test the control circuit of the fuel injector for an open and for a short to voltage. Did you find and correct the condition? If yes, go to step  13. If no, go to step  9.
  7. Test the control circuit of the fuel injector for a short to ground. Did you find and correct the condition? If yes, go to step  13. If no, go to step  12.
  8. Test for an intermittent and for a poor connection at the fuel injector. Did you find and correct the condition? If yes, go to step  13. If no, go to step  11.
  9. Test for an intermittent and for a poor connection at the PCM. Did you find and correct the condition? If yes, go to step  13. If no, go to step  12.
  10. Repair open or short to ground in the ignition 1 voltage circuit of the fuel injector. Replace the fuse as necessary. After repairs, go to step  13.
  11. Replace the affected fuel injector. After replacement, go to step  13.
  12. Replace PCM. See POWERTRAIN CONTROL MODULE in REMOVAL & INSTALLATION - SATURN "L" SERIES article. Perform PCM relearn procedure. See PCM REPROGRAMMING  under PROGRAMMING. After replacing PCM, go to next step.
  13. Clear the DTCs with a scan tool. Turn ignition off for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC. See CONDITIONS FOR RUNNING DTC . You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition? If yes, go to step  2. If no, go to next step.
  14. Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? If yes, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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