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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 11-16 volts with the engine off and with the engine running.
  2. Ignition ON. Observe the Ignition 1 Signal parameter in the ECM 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.
  3. Refer to Diagnostic Aids .
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