Intermittent Code

A diagnostic trouble code that is not present every time the PCM checks the circuit is an "intermittent" code. Most intermittent codes are caused by wiring or connector problems. Intermittent conditions that come and go like this are the most difficult to diagnose; they must be looked for under specific conditions that cause them. The following procedures may assist you in identifying a possible intermittent problem:

• Visually inspect related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals.
• Visually inspect the related harnesses. Look for chafed, pierced, or partially broken wire.
• Refer to any S.T.A.R. Hotline Newsletters or technical service bulletins that may apply.
• Use the DRBIII® data recorder or co-pilot.