Switching Solenoid Valve Signal Check

Warm engine to normal operating temperature. Connect tachometer to engine. Connect voltmeter to switching solenoid valve connector terminals. Disconnect throttle sensor connector and connect a jumper wire between terminals "A" and "C" of connector.
Start engine and run at 2000 RPM. Slowly decrease engine speed and watch voltmeter. Current should stop flowing to switching valve terminal when engine speed is 1000-1200 RPM. Disconnect No. 1 water temperature switch (located behind alternator) and connect a jumper wire between both terminals in connector.
Fully pull out choke knob; current should not flow to switching valve terminal. Push choke knob back in. Remove jumper wire from throttle sensor connector and reconnect connector. Slowly increase engine speed from idle (with throttle) and watch voltmeter. Current should not flow to switching valve at any speed. Quickly accelerate engine; current should flow to switching valve. If switching valve does not respond as outlined, replace switching solenoid valve.

Fig 1: Testing Switching Solenoid Valve
Courtesy of MAZDA MOTORS CORP.

NOTE: Before replacing air control valve, switching solenoid valve or relief solenoid valve, check auxiliary control unit, No. 2 water temperature switch, choke switch and choke relay as described in "Mazda Rotary Engine Auxiliary Control Device" article in this section. Also check throttle sensor as described in "Mazda Rotary Engine Deceleration Control System" article in this section.