Coasting Richer System Test

Run engine at idle speed. Connect voltmeter to terminal "H" (Brown/Black wire) of solenoid valve connector. See Fig 1 .
Increase engine speed to 3000 RPM and lift idle switch arm. See Fig 2 . Verify voltmeter indicates appropriate voltage according to RPM. See COASTING RICHER SYSTEM RPM/VOLTAGE table.

Fig 1: Checking Coasting Richer Solenoid Valve
Courtesy of MAZDA MOTORS CORP.

Fig 2: Locating Idle Switch Arm
Courtesy of MAZDA MOTORS CORP.