With Coolant Control Valve

Disconnect the negative battery terminal. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
Disconnect the coolant control valve connector. (See COOLANT CONTROL VALVE REMOVAL/INSTALLATION .)
Inspect for continuity between coolant control valve terminals A-B.

Courtesy of MAZDA MOTORS CORP.
- If there is continuity, the coolant control valve is normal.
- If there is no continuity, replace the coolant control valve. (See COOLANT CONTROL VALVE REMOVAL/INSTALLATION .)