Air Control Valve

Checking For Air Flow:

1. Warm up the engine to normal operating temperature.
2. Connect a tachometer to the engine.

NOTE: For ABS equipped vehicles, disconnect the air hose and vacuum hose of the air bypass valve from the turbocharger and plug the hoses before disconnecting the air hose (air silencer to air control valve) at the air control valve.

3. Disconnect the air hose (air silencer to air control valve) at the air control valve.
4. Place a finger over the air control valve outlet.
5. Slowly increase the engine speed and check that air begins to flow out at 3,750 rpm.
6. Run the engine at idle speed.

Relief Solenoid Valve Connector:

7. Disconnect the relief solenoid valve connector.
8. Check that air flows out at 1,200 rpm or more.
9. Reconnect the solenoid valve connector.

Split Air Hose Connected:

10. Disconnect the split air hose (check valve to intake manifold) at the check valve.
11. Place a finger over the port opening.

Checking For Air Flow:

12. Disconnect the vacuum hose (Solenoid valve (Switch) to air control valve) at the air control valve.
13. Check that air flows out of the split air hose.
14. Reconnect the vacuum hose and split air hose.
15. Replace the air control valve, if necessary.