Air Injection Check Valve: Testing and Inspection

Check Valve In Intake Manifold

1. Disconnect air hose between air pump and air control valve at air control valve.
2. Connect tachometer to engine.
3. Start engine and disconnect electrical connector from switching solenoid valve.
4. Increase engine speed to 1500 RPM and check for exhaust gas leakage at air inlet fitting on air control valve.
5. If there is exhaust gas leakage, replace check valve.

Check Valve Between Inlet Manifold & Catalytic Converter

1. Disconnect air hose between inlet manifold and catalytic converter at inlet manifold.
2. Connect tachometer to engine, then start engine.
3. Increase engine speed to 1500 RPM while checking for exhaust gas leakage at air pipe opening.
4. If there is exhaust gas leakage, replace check valve.