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СИСТЕМА SFI, Diagnostic DTC:P0443

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

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

The ECM changes the duty signal to the purge VSV so that the intake quantity of 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

Proper response to ECM command does not occur

(1 trip detection logic)

  • Open or short in purge VSV circuit

  • Purge VSV

  • ECM
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Tip:

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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.

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PROCEDURE


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    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (PURGE VSV)


    1. Disconnect the vacuum hose from the purge VSV.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the engine switch on (IG) and turn the tester ON.

    4. Enter the following menus: Powertrain / Engine / Active Test / Activate the VSV for EVAP Control. Press the right or left button.

    5. Check if air is sucked into the port when operating the purge VSV using the intelligent tester.

      Standard
      Tester Operation Specified Condition
      VSV is ON Suction of air
      VSV is OFF No suction of air

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    CHECK ECM (PRG VOLTAGE)


    1. Turn the engine switch on (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      E1-17 (PRG) - E3-1 (E1) Engine switch on (IG) 11 to 14 V

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    INSPECT PURGE VSV (OPERATION OF PURGE VSV)


    1. Inspect the purge VSV (see pageClick here).


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    CHECK HARNESS AND CONNECTOR (ECM - PURGE VSV)


    1. Disconnect the purge VSV connector.

    2. Disconnect the E1 ECM connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      E44-1 (purge VSV) - E1-17 (PRG) Always Below 1 Ω
      E44-1 (purge VSV) or E1-17 (PRG) - Body ground Always 10 kΩ or higher

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    CHECK HARNESS AND CONNECTOR (EFI FUSE - PURGE VSV)


    1. Remove the EFI fuse from the engine room No. 2 relay block.

    2. Disconnect the VSV connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      E44-2 (purge VSV) or relay block EFI fuse terminal 2 - Body ground Always 10 kΩ or higher
      E44-2 (purge VSV) - Relay block EFI fuse terminal 2 Always Below 1 Ω

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    CHECK FOR INTERMITTENT PROBLEMSClick here

  7. Click here

    REPLACE ECMClick here

  8. Click here

    REPLACE PURGE VSVClick here

  9. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    INSPECT ECM POWER SOURCE CIRCUITClick here