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Home >> Subaru >> 2019 >> BRZ Limited, Automatic Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Control System (Diagnostics) (2 Of 3) >> EFI System (FA20) >> DTC P0458: Evaporative Emission System Purge Control Valve Circuit Low; DTC P0459: Evaporative Emission System Purge Control Valve Circuit High >> Description of functions >> Inspection steps

Inspection steps

CAUTION: Before performing troubleshooting, check the fuse for this circuit.
  1. Performing of SSM4 [Active Test] ([Activate the VSV for Evap Control])
    1. Connect the SSM4 to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn on the SSM4.
    4. Select the following menu items using the SSM4.: [Each System]/[Engine Control System]/[Work Support]/[Active Test]/[Activate the VSV for Evap Control]
    5. Disconnect the 2 vacuum hoses of the vacuum switching valve ASSY.
    6. Activate the vacuum switching valve ASSY and apply positive pressure on E port to check if air is coming to F port.
    G12586240Courtesy of SUBARU OF AMERICA, INC.
    ACTIVE TEST DESCRIPTION (CRITERIA)

    [Active Test] ([Activate the VSV for Evap Control]) Criteria
    ON Air is coming from E port to F port
    OFF No air is coming from E port to F port
    RESULT DESCRIPTION

    Result Go to
    Malfunction A
    Normal B

    A: Go to next step

    B: Go to Step  8.

  2. Vacuum switching valve ASSY unit inspection
    1. Perform vacuum switching valve ASSY unit inspection. (Refer to INSTALLATION )

    NG: Replacement of vacuum switching valve ASSY (Refer to REMOVAL )

    OK: Go to next step

  3. Check wiring harness and connector (vacuum switching valve ASSY power supply voltage)
    NOTE: For the inspection procedure and precautions for wiring harnesses and connectors, Refer to INSPECTION PROCEDURES FOR ELECTRICAL CIRCUITS AND HOW TO PERFORM .
    1. Disconnect the vacuum switching valve ASSY connector.
    2. Measure the voltage between the terminals.
    G12586241Courtesy of SUBARU OF AMERICA, INC.
    VOLTAGE SPECIFICATION

    Inspection terminals Inspection conditions Standard value
    d1-1 - chassis ground IG ON 11 to 14 V

    NG: Go to Step  7.

    OK: Go to next step

  4. Check wiring harness and connector (engine control computer - vacuum switching valve ASSY)
    NOTE: For the inspection procedure and precautions for wiring harnesses and connectors, Refer to INSPECTION PROCEDURES FOR ELECTRICAL CIRCUITS AND HOW TO PERFORM .
    1. Disconnect the connector for the engine control computer.
    2. Disconnect the vacuum switching valve ASSY connector.
    3. Measure the resistance between the terminals. (For terminal arrangement, Refer to ECM TERMINAL ARRANGEMENT .)
    STANDARD VALUE RESISTANCE SPECIFICATION (OPEN CIRCUIT CHECK)

    Inspection terminals Inspection conditions Standard value
    A36-11(PRG) - d1-2 Always Less than 1 Ω
    STANDARD VALUE RESISTANCE SPECIFICATION (SHORT CIRCUIT CHECK)

    Inspection terminals Inspection conditions Standard value
    A36-11 (PRG) and d1-2 - other terminals and chassis ground Always 10 k Ωor more

    NG: Repair or replacement of wiring harness or connector

    OK: Go to next step

  5. Clear DTC
    1. Connect the SSM4 to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn on the SSM4.
    4. Follow the SSM4 on-screen instructions to clear the DTCs. (Refer to CHECKING/CLEARING DTC )
    5. Turn the ignition switch to OFF, and wait for 30 seconds.
  6. Perform test drive for operation check
    1. Perform test drive. (Refer to "TEST DRIVE " under "Description of functions")
      WARNING: When performing this driving test, always observe the applicable traffic laws such as the speed limit.
    2. Follow the SSM4 on-screen instructions to check the DTC.
    RESULT DESCRIPTION

    Result Go to
    No DTC is output. A
    P0458 or P0459 is output. B

    A: Go to next step

    B: Replacement of the engine control computer (Refer to REMOVAL )

    Inspection for problems that do not normally occur (Refer to INSPECTION FOR PROBLEMS THAT DO NOT NORMALLY OCCUR )

  7. Relay unit inspection (EFI MAIN1 relay)
    1. Perform unit inspection of EFI MAIN1 relay. (Refer to RELAY )

    NG: Relay replacement (EFI MAIN1 relay)

    OK: Go to next step

  8. Check wiring harness and connector (Vacuum switching valve ASSY - EFI relay)
    NOTE: For the inspection procedure and precautions for wiring harnesses and connectors, Refer to INSPECTION PROCEDURES FOR ELECTRICAL CIRCUITS AND HOW TO PERFORM .
    1. Disconnect the vacuum switching valve ASSY connector.
    2. Remove the EFI MAIN1 relay from the engine compartment relay block.
    3. Measure the resistance between the terminals.
    STANDARD VALUE RESISTANCE SPECIFICATION (OPEN CIRCUIT CHECK)

    Inspection terminals Inspection conditions Standard value
    3 (EFI MAIN1 relay holder) - d1-1 Always Less than 1 Ω
    STANDARD VALUE RESISTANCE SPECIFICATION (OPEN CIRCUIT CHECK)

    Inspection terminals Inspection conditions Standard value
    3 (EFI MAIN1 relay holder) or d1-1 - other terminals and chassis ground Always 10 k Ωor more
    CAUTION: When using tester probes to take measurements at a holder, do not push them hard against the holder. Otherwise the holder could be damaged.

    NG: Repair or replacement of wiring harness or connector

    OK: Go to next step

    Inspection of the ECM power supply system (Refer to ECM POWER SUPPLY SYSTEM )

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