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СИСТЕМА SFI, Diagnostic DTC:P0443

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DTC Code DTC Name
P0443 Evaporative Emission Control System Purge Control Valve Circuit
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DESCRIPTION

To reduce hydrocarbon emissions, evaporated fuel from the fuel tank is routed through a charcoal canister to the intake manifold for combustion in the cylinders.

The ECM changes the duty signal sent to the purge VSV (Vacuum Switching Valve for Purge Control) so that the intake amount of hydrocarbon emissions is appropriate for the driving conditions (engine load, engine speed, vehicle speed, etc.) after the engine is warmed up.

DTC No. DTC Detection Condition Trouble Area
P0443 Terminal voltage of the ECM output circuit does not correspond with the drive signals sent from the ECM to the purge VSV (1 trip detection logic).

  • Open or short in purge VSV circuit

  • Purge VSV

  • ECM
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CONFIRMATION DRIVING PATTERN


  1. Connect the GTS to the DLC3.

  2. Turn the engine switch on (IG) and turn the GTS on.

  3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).

  4. Turn the engine switch off and wait for at least 30 seconds.

  5. Turn the engine switch on (IG) and turn the GTS on.

  6. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher [A].

    Tip:

    The A/C switch and all accessory switches should be off.

  7. Idle the engine for 15 minutes or more [B].

    Tip:

    Check the EVAP (Purge) VSV item in the Data List. When the value of this item is between 5 and 95%, the judgment will be performed.

  8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].

  9. Read the pending DTCs.

    Tip:

    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

  10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

  11. Input the DTC: P0443.

  12. Check the DTC judgment result.

    GTS Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions
    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
    Tip:

    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or N/A, perform steps [D] through [E].

  13. Drive the vehicle at a constant speed between 40 and 60 km/h (25 and 38 mph) for 10 minutes [D].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

  14. Check the DTC judgment result [E].

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WIRING DIAGRAM

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INSPECTION PROCEDURE

Tip:

Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

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PROCEDURE


  1. Click here

    PERFORM ACTIVE TEST USING GTS (ACTIVATE THE VSV FOR EVAP CONTROL)


    1. A01EQMUE01

      Connect the GTS to the DLC3.

    2. Disconnect the vacuum hose (charcoal canister side) from the purge VSV.

    3. Start the engine.

    4. Turn the GTS on.

    5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VSV for EVAP Control.

    6. When the purge VSV is operated using the GTS, check whether the port of the purge VSV applies suction to your finger.

      OK
      GTS Operation Specified Condition
      VSV ON Purge VSV port applies suction to finger
      VSV OFF Purge VSV port applies no suction to finger

    7. Reconnect the vacuum hose to the purge VSV.


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    INSPECT PURGE VSV


    1. Inspect the purge VSV (Click here).


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    INSPECT PURGE VSV (POWER SOURCE)


    1. A01EQCSE43

      Disconnect the purge VSV connector.

    2. Turn the engine switch on (IG).

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      C16-1 - Body ground Engine switch on (IG) 11 to 14 V
      Table 1. Text in Illustration
      *a

      Front view of wire harness connector

      (to Purge VSV)

    4. Reconnect the purge VSV connector.


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    CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM)


    1. Disconnect the purge VSV connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      C16-2 - C54-63 (PRG) Always Below 1 Ω
      C16-2 or C54-63 (PRG) - Body ground Always 10 kΩ or higher

    4. Reconnect the purge VSV connector.

    5. Reconnect the ECM connector.


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    PERFORM CONFIRMATION DRIVING PATTERN


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).

    5. Turn the engine switch off and wait for at least 30 seconds.

    6. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

    7. Idle the engine for 15 minutes or more.

    8. Turn the GTS on.

    9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

    10. Input the DTC: P0443.

    11. Check the DTC judgment result.

      Table 2. Result
      Result Proceed to
      NORMAL (DTC is not output) A
      ABNORMAL (DTC P0443 is output) B
      Tip:

      If the judgment result shows INCOMPLETE or N/A, drive the vehicle at a constant speed between 40 and 60 km/h (25 and 38 mph) for 10 minutes and check the DTC judgment result again.


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    CHECK FOR INTERMITTENT PROBLEMSClick here

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    REPLACE PURGE VSVClick here

  8. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR OR REPLACE FUSE (PURGE VSV - NO. 1 INTEGRATION RELAY)

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPLACE ECMClick here

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    CHECK FOR INTERMITTENT PROBLEMSClick here