For Air Switching Valve

Fig.40 - Checking Air Switching Valve Solenoid Valve:

1. Disconnect vacuum hoses from three way solenoid valve and vacuum pipe.
2. Blow air through the solenoid valve from vacuum hose (B), Fig. 40. Ensure air flows through the solenoid valve and out from air filter port (A).

Fig.41 - Checking Air Flow Out From Solenoid Valve:

3. Start engine and increase engine speed to 1200 RPM. Blow air through the solenoid valve from vacuum hose (B). Ensure air flows through solenoid valve and out from port (a), Fig. 41. If no air flow, replace three way solenoid valve.