Pressure Regulator Control (PRC) Solenoid Valve

Disconnect vacuum hose from PRC solenoid valve. See PRC SOLENOID VALVE LOCATIONS  table. Apply air pressure to PRC solenoid valve port "B". See Fig 1 . Air should flow from port "C". Using fused jumper wires, apply battery voltage to solenoid terminals. Apply air pressure to PRC solenoid valve port "B". Air should flow through PRC solenoid valve air filter (port "A"). Replace PRC solenoid valve as necessary.

Fig 1: Identifying PRC Solenoid Valve (Except Miata)

Courtesy of MAZDA MOTORS CORP.