SFI SYSTEM, Diagnostic DTC:P0443

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

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 signals to the purge VSV 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
  • All of the following conditions (a) are met (1 trip detection logic)


    1. The target control value and actual control value do not match for 10 seconds or more.

    2. The target control value and actual control value do not match for 80 times or more.


  • Open or short in purge VSV circuit

  • Purge VSV

  • ECM

CONFIRMATION DRIVING PATTERN

A003EE4E01

  1. Connect the intelligent tester to the DLC3.

  2. Turn the ignition switch to ON and turn the intelligent tester on.

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

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

  5. Turn the ignition switch to ON and turn the intelligent tester on.

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

    Tech Tips

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

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

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

  9. Read the pending DTCs.

    Tech Tips


    • 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.

    Tester 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

    Tech Tips


    • 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] and [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].

WIRING DIAGRAM

A003C0OE04

INSPECTION PROCEDURE

Note

Inspect the fuses of circuits related to this system before performing the following inspection procedure.

Tech Tips

Read freeze frame data using the intelligent tester. 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.

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (ACTIVATE THE VSV FOR EVAP CONTROL)


    1. A003CFBE06

      Connect the intelligent tester to the DLC3.

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

    3. Start the engine.

    4. Turn the intelligent tester on.

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

    6. Place your finger on port E. Check if the disconnected port applies suction to your finger when operating the purge VSV using the intelligent tester.

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

    NG
    OK
  2. INSPECT PURGE VSV


    1. Inspect the purge VSV Click here.


    NG
    OK
  3. INSPECT PURGE VSV (POWER SOURCE)


    1. A003FSOE54
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Purge VSV)

      Disconnect the purge VSV connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D28-2 - Body ground Ignition switch ON 11 to 14 V

    NG
    OK
  4. 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
      D28-1 - D97-62 (PRG) Always Below 1 Ω
      D28-1 or D97-62 (PRG) - Body ground Always 10 kΩ or higher

    NG
    OK
  5. PERFORM CONFIRMATION DRIVING PATTERN


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

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

    5. Turn the ignition 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 tester on.

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

    10. Input the DTC: P0443.

    11. Check the DTC judgment result.

      Result
      Result Proceed to
      NORMAL (DTC is not output) A
      ABNORMAL (DTC P0443 is output) B

      Tech Tips

      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.


    B
    A