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Home >> Saturn >> 2003 >> Ion 1 Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Fuel Systems >> Fuel Injector Circuit Diagnosis >> Diagnostic Procedure
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Diagnostic Procedure

  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 in SELF-DIAGNOSTICS - 2.2L ION article.
  2. Is DTC P0200, P0261, P0262, P0264, P0265, P0267, P0268, P0270 or P0271 set? If yes, diagnose affected DTC. See DIAGNOSTIC TROUBLE CODE DEFINITIONS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 2.2L ION article. If no, go to next step.
  3. Inspect the injectors fuse. Is the injectors fuse open? If yes, go to next step. If no, go to step  6 .
  4. Turn ignition switch to OFF position. Remove the air cleaner outlet resonator. Disconnect the fuel injector harness connectors. Probe the fuel injector ignition 1 voltage circuit, fuse side, with a test light connected to battery voltage. Does the test light illuminate? If yes, go to step  8 . If no, go to next step.
  5. Turn ignition switch to RUN position, engine OFF. Does the test light illuminate? If yes, go to step  11 . If no, go to DIAGNOSTIC AIDS  .
  6. Turn ignition switch to OFF position. Remove the air cleaner outlet resonator. Disconnect the harness connector of a fuel injector. Turn ignition switch to RUN position, engine OFF. Probe the fuel injector ignition 1 voltage circuit, fuse side, with a test light connected to a good ground. Does the test light illuminate? If yes, go to next step. If no, go to step  9 .
  7. Remove the injectors fuse. Measure the resistance from the injectors fuse to the ignition 1 voltage circuit terminal of a fuel injector using a DVOM. Is the resistance more than 5 ohms? If yes, go to step  10 . If no, go to INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 2.2L ION article.
  8. Repair the short to ground in the fuel injector ignition 1 voltage circuit. After repair, go to step  12 .
  9. Repair the open in the fuel injector ignition 1 voltage circuit. After repair, go to step  12 .
  10. Repair the high resistance in the fuel injector ignition 1 voltage circuit. After repair, go to step  12 .
  11. Repair the short to a PCM ground in the fuel injector ignition 1 voltage circuit. After repair, go to next step.
  12. 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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