Fuel Pressure Control Solenoid

FUEL PRESSURE SOLENOID







OPERATION
- The fuel pressure solenoid is an ON-OFF type solenoid valve that switches the pressure introduced to the fuel pressure regulator between either intake manifold pressure or barometric pressure.
- Battery power is supplied to this valve via the MFI relay. When the engine control module turns ON the internal power transistor, the coil is energized to allow barometric pressure to be introduced to the fuel pressure regulator.




INSPECTION
Using Scan Tool

HARNESS INSPECTION




Measure the power supply voltage
- Connector: Disconnected
- Ignition switch: ON
Voltage (V): Battery positive voltage
OK: GO TO STEP 2
NG: Repair the harness. (A1 - MFI relay)




Check for an open-circuit, or a short-circuit to ground, between the fuel pressure solenoid and the engine control module.
- Engine control module connector: Disconnected
- Fuel pressure solenoid connector: Disconnected
OK: STOP
NG: Repair the harness. (A2 - 48)

FUEL PRESSURE SOLENOID CHECK
Operation Check

NOTE: Before disconnecting the vacuum hose, mark it to ensure reconnection at the correct position.




1. Remove the vacuum hose (blue stripe on black) from the solenoid valve.
2. Disconnect the harness connector.







3. Apply a negative pressure to the nipple to which the black vacuum hose has been connected and check airtightness with and without the battery voltage applied to the solenoid valve terminal.




Coil Resistance Check
1. Measure the coil resistance with a circuit tester.
Standard value: 36 - 46 Ohm [at 20° C (68° F)]