Examination
1. To check the recirculation valve sensor, disconnect the valve connection connector (arrow) and check the resistance between terminals 1 and 3, 3 and 5, 2 and 4, 4 and 6 on the valve. It should be approximately 22 ohms. If not, replace the valve.
2. Warm up the engine to normal operating temperature. Disconnect the vacuum hose from the valve and connect the vacuum pump. When creating a vacuum, the engine should deteriorate or it may stall altogether. If not, replace the valve.
3. Check that the solenoid valve changes the direction of air flow when energized.
Recirculation valve replacement
1. Disconnect the valve connector. Unscrew the recirculation tube, unscrew the fixing bolts (indicated by arrows) and remove the valve.
2. Installation is carried out in the reverse order of removal. Use a new gasket.