- Intermittent Malfunctions

An intermittent problem may or may not set a diagnostic trouble code. If it is an intermittent failure, a Diagnostic Trouble Code Chart is not used. Consult the Diagnostic Aids within diagnostic chart corresponding to the intermittent diagnostic trouble code. Also, refer to the matrix charts under "Diagnosis by Symptom". Testing and Inspection

A physical/visual inspection of the applicable sub-system most often will resolve the problem. Use of the customer snap-shot and Scan tool snap-shot may isolate the malfunction.