Scan Tool Displays Undefined DTC

Scan Tool Displays Undefined DTC:

CIRCUIT DESCRIPTION
The scan tool displays a DTC that is not defined in the service manual. The probable cause is an internal malfunction.

DIAGNOSTIC AIDS
^ It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.
^ An intermittent malfunction can be caused by poor connections, broken insulation, or a wire that is broken inside the insulation.
^ If an intermittent malfunction exists, refer to Intermittents and Poor Connections Diagnosis in Diagnostic Aids.