LEMON Manuals: Even more car manuals for everyone
Home >> Subaru >> 2019 >> BRZ Limited, Standard Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics) (1 Of 3) >> EFI System (FA20) >> DTC P0193: Fuel Rail Pressure Sensor Circuit High Input >> Description of functions >> Inspection steps

Inspection steps

  1. Data monitor check
    1. Connect the SSM4 to the DLC3.
    2. Turn the ignition switch to ON.
    3. Follow the SSM4 on-screen instructions to clear the DTCs.
    4. Turn the ignition switch to OFF, and wait for 30 seconds.
    5. Start the engine.
    6. Use the Subaru Select Monitor or the general scan tool to read the [Fuel Rail Pressure A] value.
    STANDARD VALUE SPECIFICATION

    Item name Standard value
    Actual fuel pressure 1 25 MPa or more

    NG: The circuit returns to normal at this point even if a DTC is detected. Reproduce the faulty condition and perform the diagnosis again. In this case, temporary contact failure of the connector may be present, or the harness may be temporary open or shorted.

    OK: Go to the next step

  2. Check wiring harness and connector (voltage of the fuel pressure sensor)
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from the fuel pressure sensor.
    3. Turn the ignition switch to ON.
    4. Measure the voltage between the terminals.
    STANDARD VALUE SPECIFICATION

    Measuring terminal Result
    C46 - 4 (VC) - chassis ground 4.5 to 5.5V

    NG: Go to step  5.

    OK: Go to the next step

  3. Wiring harness and connector check
    1. Turn the ignition switch to OFF.
    2. Disconnect the connectors from the engine control computer.
    3. Disconnect the connector from the fuel pressure sensor.
    4. Measure the resistance between the engine control computer connector and fuel pressure sensor.
    STANDARD VALUE SPECIFICATION

    Measuring terminal Result
    A34-7 (FUEL P2) - C46-1 (VOUT2) Less than 1 Ω
    A36-29(E1) - C46-2(GND) Less than 1 Ω

    NG: Repair or replacement of wiring harness or connector

    OK: Go to the next step

  4. Check of the power supply for the fuel pressure sensor check
    1. Connect all connectors.
    2. Turn the ignition switch to ON.
    3. Measure the voltage between the engine control computer connector and chassis ground.
    STANDARD VALUE SPECIFICATION

    Measuring terminal Result
    A34-7 (FUEL P2) - Chassis ground 5V or more
    C46 - 1 (VOUT2) - Chassis ground 5V or more

    NG: Replacement of the fuel pressure sensor (Refer to FUEL PRESSURE SENSOR (FA20) )

    OK: Go to the next step

    Repair or replacement of wiring harness or connector

  5. Inspection of the wiring harness and the connector
    1. Turn the ignition switch to OFF.
    2. Disconnect the connectors from the engine control computer.
    3. Disconnect the connector from the fuel pressure sensor.
    4. Measure the resistance between the terminals.
    STANDARD VALUE SPECIFICATION

    Measuring terminal Result
    A36-19(VC) - C46-4(VC) Less than 1 Ω

    NG: Repair or replacement of wiring harness or connector

    OK: Go to the next step

  6. Inspection of the wiring harness and the connector
    1. Turn the ignition switch to OFF.
    2. Disconnect the connectors from the engine control computer.
    3. Disconnect the connector from the fuel pressure sensor.
    4. Measure the resistance between the terminals.
    STANDARD VALUE SPECIFICATION

    Measuring terminal Result
    A36-19 (VC) - chassis ground 10 kΩ or more
    C46 - 4 (VC) - chassis ground 10 kΩ or more

    NG: Repair or replacement of wiring harness or connector

    OK: Go to the next step

    Replacement of the engine control computer

scientia non olet · About LEMON Manuals