California Models

Warm engine to normal operating temperature. Stop engine and connect tachometer. Attach voltmeter to ground and to Light Green wire of relief solenoid valve connector (do not detach connector).

Fig 1: Testing Signal To Relief Valve Solenoid (Calif.)
Courtesy of MAZDA MOTORS CORP.
Disconnect vacuum switch electrical coupler. Start engine with choke knob pulled fully out. Note voltmeter to be sure current is reaching solenoid terminal. Push choke knob all the way in.
Place jumper wire on vacuum switch connector. See Fig 1. Increase engine speed to 3500 RPM, using throttle. Current should stop flowing to terminal after approximately 130 seconds from engine start in step 2).
Return to engine to idle, then slowly increase engine speed. Current should stop flowing to terminal when engine is running faster than 3000 RPM.
On manual transmission equipped models, set engine speed to 2000 RPM with throttle. Depress clutch pedal and check that current stops flowing when shifting into 4th and/or 5th gear.
Remove jumper wire from vacuum switch connector. Using throttle, increase engine speed to 2000 RPM. Slowly decrease engine speed and record speed at which current begins flowing to terminal. Speed should be about 1050-1250 RPM.
From idle, slowly increase speed and check speed at which current stops flowing to terminal. Difference between this speed and that recorded in previous step should be 80-220 RPM.