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

Terminal voltage of ECM output circuit does not correspond with drive signals from ECM to purge VSV

(1 trip detection logic)

  • Open or short in purge VSV circuit

  • Purge VSV

  • ECM

WIRING DIAGRAM

A00542XE07

CAUTION / NOTICE / HINT

Note

Inspect the fuses for 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 PURGE VSV CONTROL)


    1. A0054MCE01
      *1 VSV ON
      *2 VSV OFF
      *3 Suction of air
      *4 No suction of air

      Connect the intelligent tester to the DLC3.

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

    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 intelligent tester, check whether the disconnected hose applies suction to your finger.

      OK
      Tester Operation Specified Condition
      VSV is ON Disconnected hose applies suction to finger
      VSV is OFF Disconnected hose applies no suction to finger

    7. Reconnect the vacuum hose of the purge VSV to the charcoal canister.


    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

  2. INSPECT PURGE VSV


    1. A0054NKE01
      Text in Illustration
      *1

      Component without harness connected

      (Purge VSV)

      Disconnect the purge VSV connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - 2 20°C (68°F) 23 to 26 Ω

    3. Reconnect the purge VSV connector.


    NG

    REPLACE PURGE VSV Click here

    OK

  3. INSPECT PURGE VSV (POWER SOURCE VOLTAGE)


    1. A005376E02
      Text in Illustration
      *1

      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
      B20-2 - Body ground Ignition switch ON 11 to 14 V

    4. Reconnect the purge VSV connector.


    NG

    CHECK HARNESS AND CONNECTOR (PURGE VSV - 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 (Check for open)
      Tester Connection Condition Specified Condition
      B20-1 - B39-62 (PRG) Always Below 1 Ω
      Standard Resistance (Check for short)
      Tester Connection Condition Specified Condition
      B20-1 or B39-62 (PRG) - Body ground Always 10 kΩ or higher

    4. Reconnect the purge VSV connector.

    5. Reconnect the ECM connector.


    OK

    REPLACE ECM Click here

    NG

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

  5. CHECK HARNESS AND CONNECTOR (PURGE VSV - INTEGRATION RELAY)


    1. A005813E02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Purge VSV)
      *2

      Front view of wire harness connector

      (to Integration Relay)

      Disconnect the purge VSV connector.

    2. Remove the integration relay (EFI MAIN relay) from the engine room No. 1 relay block and disconnect the integration relay connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      B20-2 - 1B-4 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      B20-2 or 1B-4 - Body ground Always 10 kΩ or higher

    4. Reconnect the purge VSV connector.

    5. Reinstall the integration relay.


    OK

    GO TO ECM POWER SOURCE CIRCUIT Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (PURGE VSV - INTEGRATION RELAY)