PCM/TCM Intermittent Diagnostic Trouble Code or Performance

The Diagnostic Trouble Code (DTC) charts determine if there is a fault within the circuit. The fault must be present to locate the problem. If an intermittent condition occurs, a DTC will be stored in history status, but the circuit check will indicate a normal condition. Most intermittent conditions are usually a faulty connection or component. When diagnosing intermittents, thoroughly check the suspected circuits for:
^ Poor terminal tension.
^ Poor seating of connector halves.
^ Poor terminal to wire connection.
^ Improperly formed or damaged terminals.
^ Improperly installed electrical options.
^ Faulty PCM power or ground connection.
^ Intermittent short or open.
^ Electrical system surges caused by a defective relay, solenoid, or switch. Normally these conditions will occur when the faulty component is operated.