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Home >> Oldsmobile >> 2003 >> Aurora >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Fuel Systems >> Fuel Injector Coil Test >> Diagnostic Procedure
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Diagnostic Procedure

  1. Perform Diagnostic System Check - Engine Controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS in SELF-DIAGNOSTICS - 4.0L AURORA article. After performing Diagnostic System Check - Engine Controls, go to next step.
  2. Using scan tool, check Engine Coolant Temperature (ECT). Is the ECT value within 50-90°F (10-32°C)? If yes, go to next step. If no, go to step  4 .
  3. Disconnect fuel injector connector. Using DVOM, measure resistance of each fuel injector. Do any of the fuel injectors display a resistance outside 11-14 ohms? If yes, go to step  6 . If no, see DIAGNOSTIC AIDS  .
  4. Disconnect fuel injector connector. Using DVOM, measure resistance of each fuel injector. Record each fuel injector value. Subtract lowest resistance value from highest resistance value. Is the difference equal to, or less than, 3 ohms? If yes, see DIAGNOSTIC AIDS  . If no, go to next step.
  5. Add all fuel injector resistance values, to obtain total resistance value. Divide total resistance value by number of fuel injectors, to obtain average resistance value. Subtract lowest and highest individual fuel injector resistance values from average resistance value. Replace the fuel injector that displays the greatest resistance difference, above or below the average. See FUEL RAIL & INJECTORS under FUEL SYSTEMS in REMOVAL & INSTALLATION - AURORA article. After repairs, go to step  7 .
  6. If resistance of fuel injector(s) is not 11-14 ohms, replace fuel injector(s). See FUEL RAIL & INJECTORS under FUEL SYSTEMS in REMOVAL & INSTALLATION - AURORA article. After repairs, go to next step.
  7. Operate system in order to verify repair. Did you correct the condition? If yes, system is okay. If no, go to step  2 .
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