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Circuit/System Verification

  1. Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.0 V
  2. Engine running, observe the scan tool ECM Ignition 1 signal parameter. The voltage should be between 12.6 and 15.0 V
    • If not within the specified range, replace the ECM.
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