Diagnostic Aids
WARNING: This page is about a different car, the 2003 GMC Sonoma and 2003 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
- An AIR solenoid stuck open or leaking vacuum may hold the shut-off valve open. An audible exhaust noise may be heard through the AIR pump inlet hose. This condition may not set a code and may cause fuel trims to indicate high percent at an idle.
- Verify proper connections of the vacuum hoses. Reversed connections at the AIR solenoid may cause the AIR shut-off valve to stick open.
- Low system airflow may cause this DTC to set.
- Excessive exhaust system back-pressure may cause this DTC to set.
- An intermittent may be caused by pinched, restricted, split, or damaged pipes/hoses or vacuum lines. Restrictions in the AIR pump inlet hose or damaged contacts in the AIR pump relay (tap on AIR pump relay to attempt to duplicate an intermittent condition).
- Heat damage to the AIR crossover hose may indicate an exhaust check valve failure.
- Water or debris ingested into the AIR pump may cause this DTC to set.
- Observe the Freeze Frame/Failure Records to see what conditions set this DTC.
Thoroughly check any circuitry that is suspected of causing the intermittent complaint. Repair as necessary.