Temperature Sensitivity
- An intermittent condition may occur when a component or connection reaches normal operating temperature. The condition may occur only when the component or connection is cold, or only when the connection is hot.
- The following data may help to diagnose this type of intermittent condition:
- Freeze Frame/Failure Records.
- Scan tool snapshot.
- Vehicle data recorder.
- If the intermittent is related to heat, review the following data:
- High ambient temperatures.
- Underhood or engine generated heat.
- Circuit generated heat due to a poor connection, or high electrical load.
- Higher than normal load conditions, such as towing.
- If the intermittent is related to cold, review the following data:
- Low ambient temperatures. In extremely low temperatures, ice may form in a connection or component. Test for water intrusion.
- The condition only occurs on a cold start.
- The condition is not present after the vehicle warms up.
- Information from the customer may help to determine if the trouble follows a pattern that is temperature related.