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Home >> Cadillac >> 2002 >> Escalade EXT >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Fuel System (Gasoline) >> Fuel Injector Coil Test (8.1L) >> Diagnostic Procedure
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Diagnostic Procedure

  1. Perform Diagnostic System Check - Engine Controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 8.1L "C", "G" & "K" SERIES TRUCKS article. After performing Diagnostic System Check - Engine Controls, go to next step.
  2. Observe Engine Coolant Temperature (ECT) parameter with scan tool. Is ECT value within 50-90°F (10-32°C)? If yes, go to next step. If no, go to step  4.
  3. Measure resistance of each fuel injector with DMM. Do any fuel injectors display a resistance outside 11-14 ohms? If yes, go to step  6. If no, go to DIAGNOSTIC AIDS .
  4. Measure resistance of each fuel injector with DMM. Record each fuel injector value. Subtract lowest resistance value from highest resistance value. Is difference equal to, or less than 3 ohms? If yes, go to DIAGNOSTIC AIDS . If no, go to next step.
  5. Add all fuel injector resistance values, to obtain a total resistance value. Divide total resistance value by number of fuel injectors to obtain an average resistance value. Subtract lowest and highest individual fuel injector resistance values from average resistance value. Replace fuel injector that displays greatest resistance difference, more or less than average. After repairs, go to step  7.
  6. Replace fuel injector(s) that are outside of 11-14 ohms range. 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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