Pressure Regulator Control
- 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 Fig 1
. If intake manifold vacuum is not present, check vacuum source, pressure regulator control solenoid and related circuits.
Courtesy of MAZDA MOTORS CORP.