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Circuit/System Verification

  1. Ignition ON. Measure and record the voltage at the battery terminals. Verify that the battery voltage is 11-15 volts. Repeat with the engine running.
  2. Engine running. Observe the scan tool Ignition 1 Signal parameter in the ECM data list. Verify that the scan tool displays a value that is within 2 volts of the battery voltage recorded in step 1.
    • If the scan tool parameter is not within the specified range, replace the ECM.
  3. Go to Diagnostic Aids.
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