Auxiliary Air Valve

Auxiliary Air Valve Hose:

CHECK FUNCTION

A faulty auxiliary air valve does not set a trouble code.

1. With engine idling, carefully pinch off hose between air intake duct and auxiliary air valve.
2. Check that engine speed changes as follows:

Engine cold: significant drop in engine RPM.
Engine hot: engine speed drop of less than 100 RPM.

3. If engine speed does not change as indicated, check for stuck valve and/or damaged hose. Replace component(s) found to be faulty.

Auxiliary Air Valve Testing:

CHECK RESISTANCE AND VOLTAGE

1. Disconnect auxiliary air valve connector.
2. Check resistance between valve terminals. If it is either 0 or infinite, replace auxiliary air valve.
3. With engine running, check voltage across valve connector terminals. It should be above 12V.
4. If voltage is low or 0, check condition of harness and connector; repair as necessary.