Diagnostic Aids
WARNING: This page is about a different variant/trim than selected.
- An intermittent may be caused by any of the following conditions.
- Low system airflow
- Excessive exhaust system back-pressure
- Pinched, restricted, split, or damaged pipes/hoses
- Restrictions in the AIR pump inlet hose
- Pitted contacts in the AIR pump relay, AIR valve relay-Tap on the AIR pump relay or AIR valve relay to attempt to duplicate an intermittent condition.
- Yellow tinted water in the AIR pump may indicate a control/shut-off valve failure.
- Water or debris ingested into the AIR pump
- Observe the Freeze Frame/Failure Records to aid in conditions of setting DTC P0411.
- Thoroughly inspect any circuits that are suspected of causing the intermittent condition. Refer to Testing for Intermittent Conditions and Poor Connections .