Pressure Regulator Control
WARNING: This page is about a different car, the 1994 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
- Engine must be at or near operating temperature. Turn engine off. Disconnect vacuum hose at fuel pressure regulator and connect a vacuum gauge to hose.
- Without touching throttle, start engine. Observe vacuum gauge. Vacuum should not exist. If vacuum is present, check pressure regulator control solenoid and related circuits. If no vacuum exists, count seconds until vacuum gauge shows intake manifold vacuum. See PRESSURE REGULATOR SPECIFICATIONS table.
- If vacuum gauge shows intake manifold vacuum after specified amount of time, system is okay. See Figure . If intake manifold vacuum is not present, check vacuum source, pressure regulator control solenoid and related circuits.