Electrical Signal Check

Warm engine to normal operating temperature. Stop engine and connect tachometer. Disconnect air conditioner solenoid valve (white color dot) coupler and connect voltmeter to wiring harness terminals. Connect positive probe to "GW" wire, negative probe to "B" wire.

Fig 1: Schematic Showing Hose Disconnection for Testing Air Conditioning Solenoid Valve
Courtesy of MAZDA MOTORS CORP.
Start engine and turn air conditioner "ON". Increase engine speed to 2000 RPM, using throttle. Slowly decrease engine speed. Current should flow to terminals when engine speed is 1050-1250 RPM.