СИСТЕМА SFI, Diagnostic DTC:P0443

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

DESCRIPTION

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

The ECM changes the duty signals to the purge VSV (Vacuum Switching Valve) 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

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

  • ECM

WIRING DIAGRAM

A01CC21E02

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 PURGE VSV CONTROL)


    1. A01CDIFE01

      Connect the intelligent tester to the DLC3.

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

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

      OK
      Tester Operation Specified Condition
      ON (Purge VSV is on) Purge VSV port applies suction to finger
      OFF (Purge VSV is off) Purge VSV port applies no suction to finger

    7. Reconnect the vacuum hose to the purge VSV.


    NG

    INSPECT PURGE VSV Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

  2. INSPECT PURGE VSV


    1. Inspect the purge VSV Click here.


    NG

    REPLACE PURGE VSV Click here

    OK

  3. CHECK PURGE VSV (POWER SOURCE VOLTAGE)


    1. A01CDRRE16
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Purge VSV)

      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
      D43-1 - Body ground Engine switch on (IG) 11 to 14 V

    4. Reconnect the purge VSV connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (PURGE VSV - EFI MAIN RELAY)

    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 (Check for Open)
      Tester Connection Condition Specified Condition
      D43-2 - D41-49 (PRG) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      D43-2 or D41-49 (PRG) - Body ground Always 10 kΩ or higher

    4. Reconnect the purge VSV connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (PURGE VSV - ECM)

    OK

    REPLACE ECM Click here