Air Injection: Testing and Inspection

Air Pump Diagnosis:

AIR PUMP TEST




AIR SWITCH RELIEF VALVE SOLENOID TEST
Remove vacuum hoses. With the solenoid wire disconnected air should flow from the vacuum port through the vent port. Energize the solenoid, air should flow through both vacuum ports. If either test fails, the solenoid valve must be replaced.

Air Switching Valve (Combination Switch/Relief Valve):

AIR SWITCH RELIEF VALVE TEST
Apply vacuum to the valve. Ensure air injection is applied upstream. If air is not directed upstream the valve has failed and must be replaced. If air escapes from the silencer at idle, the relief valve is faulty.




CHECK VALVE TEST
Remove hose from check valve. If exhaust flows from the valve, the valve is faulty and must be replaced.