Testing For An Intermittent Condition: Introduction

Duplicating the conditions under which the stored DTC set is very important when diagnosing an intermittent condition. Review the Freeze Frame Data (if available), Event Data (if available), Environmental Data, and the When Monitored information for the DTC being diagnosed. The customer can also provide vital information regarding the conditions when the DTC set.

If possible, pay particular attention to the ambient air temperature when the DTC set. Electrical connections, such as wire terminal connections, solder joints, and printed circuit board traces will expand and contract due to temperature changes. If the DTC was set in extreme cold conditions, the vehicle may need to be tested in extreme cold conditions.