Fuel Pressure Hold

Disconnect negative battery cable. Install fuel pressure gauge in fuel supply line. Reconnect negative battery cable.
Locate data link connector in left side of engine compartment. Connect a jumper wire between data link connector terminals F/P and GND. See Fig 1 . Turn ignition on for 10 seconds to operate fuel pump. Turn ignition off and disconnect jumper wire. Wait 5 minutes and observe fuel pressure. See FUEL PUMP HOLD PRESSURE table.
On MPV, if fuel pressure is not as specified, check for leaks and fuel pressure regulator. On all other models, if fuel pressure is not as specified, check fuel pump hold pressure and fuel pressure regulator hold pressure. See FUEL PUMP HOLD PRESSURE and FUEL PRESSURE REGULATOR HOLD PRESSURE . Also check for injector fuel leakage. See INJECTOR FUEL LEAKAGE .

Fig 1: Identifying Data Link Connector Terminals
Courtesy of MAZDA MOTORS CORP.

FUEL PUMP HOLD PRESSURE

Application

PSI (kg/cm² )

MPV

⁽¹⁾ 25 (1.8)

All Others

⁽¹⁾ 21 (1.5)

⁽¹⁾	Minimum allowable pressure.