SFI SYSTEM, Diagnostic DTC:P0443

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

DESCRIPTION

To reduce 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 signal sent to the purge VSV so that the intake amount of HC emissions is appropriate for driving conditions (engine load, engine speed, vehicle speed, etc.) after the engine is warmed up.

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

  • Open or short in purge VSV circuit

  • Purge VSV

  • ECM

WIRING DIAGRAM

A01DN9UE04

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions 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. A01DQR5E03
      Text in Illustration
      *1 Purge VSV
      *2 Hose (to Canister)

      Connect the intelligent tester to the DLC3.

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

    3. Start the engine and turn the tester on.

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

    5. 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

    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. INSPECT PURGE VSV (POWER SOURCE VOLTAGE)

    A01DQIJE74
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Purge VSV)

    1. Disconnect the purge VSV connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      C15-1 - Body ground Ignition switch ON 11 to 14 V

    3. Reconnect the purge VSV connector.


    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 between the terminals of the wire harness side connectors.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      C15-2 - C36-18 (PRG) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      C15-2 or C36-18 (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

    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.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      C15-1 - 1B-4 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      C15-1 or 1B-4 - Body ground Always 10 kΩ or higher

    4. Reconnect the purge VSV connector.

    5. Reinstall the No. 1 integration relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPAIR OR REPLACE POWER SOURCE CIRCUIT COMPONENTS