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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 11-17 volts. Repeat with the engine running.
  2. Engine running. Observe the scan tool Battery Voltage Signal parameter in the EBCM data list. Verify that the scan tool displays a value that is within 1 volt of the battery voltage recorded in step 1.
    • If the scan tool parameter is not within the specified range, go to Circuit/System Testing.
  3. Go to Diagnostic Aids.
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