SFI SYSTEM, Diagnostic DTC:P0443

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

DESCRIPTION

To reduce hydrocarbon (HC) 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 (Vacuum Switching Valve for Purge Control) so that the intake amount of hydrocarbon (HC) 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

Both of the following conditions (a) and (b) are met (1 trip detection logic):

(a) The target control value and actual control value do not match for 10 seconds or more

(b) 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

  • No. 1 integration relay

  • ECM

CONFIRMATION DRIVING PATTERN

B000H38E04

  1. Connect the intelligent tester to the DLC3.

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

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

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

  5. Turn the ignition switch to ON and turn the 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 switch and all accessory switches should be off.

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

    Tech Tips

    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 / 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 37 mph) for 10 minutes or more [D].

    CAUTION:

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

  14. Check the DTC judgment result again [E].

WIRING DIAGRAM

B000NB9E11

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. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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. B000HKME01
      Text in Illustration
      *1 Purge VSV
      *2 Fuel Vapor Feed Hose (to Canister)

      Disconnect the fuel vapor feed hose (on the canister side) of the purge VSV.

    2. Connect the tester to the DLC3.

    3. Start the engine.

    4. Turn the tester on.

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

    6. Operate the purge VSV and check the air flow.

      OK
      Activate the VSV for Evap Control Specified Condition
      ON Air flows
      OFF Air does not flow
      Result
      Result Proceed to
      Abnormal A
      Normal B

      Tech Tips

      Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.


    B

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

  2. INSPECT PURGE VSV


    1. Inspect the purge VSV Click here.


    NG

    REPLACE PURGE VSV Click here

    OK

  3. CHECK TERMINAL VOLTAGE (POWER SOURCE OF PURGE VSV)


    1. B000JMRE01
      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
      E49-1 - Body ground Ignition switch ON 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (PURGE VSV - NO. 1 INTEGRATION RELAY) Click here

    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
      E49-2 - E26-68 (PRG) Always Below 1 Ω
      E49-2 or E26-68 (PRG) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here

  5. CHECK HARNESS AND CONNECTOR (PURGE VSV - NO. 1 INTEGRATION RELAY)


    1. Disconnect the purge VSV connector.

    2. Remove the No. 1 integration relay from the engine room relay block and junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E49-1 - 1A-8 Always Below 1 Ω
      E49-1 or 1A-8 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE NO. 1 INTEGRATION RELAY Click here