Diagnostic Aids

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A cylinder that is misfiring can also cause the misfire current counters to increment for another cylinder. Diagnose the cylinder with the highest level of misfire first.
Performing the Fuel Injector Coil Test may help to isolate an intermittent condition. Refer to Fuel Injector Diagnosis (w/J39021 or w/Tech 2) or Fuel Injector Diagnosis (w/CH47976) .
If the condition is intermittent, refer to Testing for Intermittent Conditions and Poor Connections .