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Circuit/System Verification

  1. Measure and record the voltage at the battery terminals with the engine OFF, and again with the engine running. Verify that the battery voltage is 11-17 volts with the engine OFF and with the engine running.
  2. Observe the Ignition 1 Signal parameter in the ECM Electrical/Theft scan tool 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, refer to Circuit/System Testing below.
  3. Refer to Diagnostic Aids .
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