SFI SYSTEM, Diagnostic DTC:P0443

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

DESCRIPTION

In order to reduce hydrocarbon (HC) emissions, evaporated fuel from the fuel tank is routed through the charcoal canister to the intake manifold for combustion in the cylinders. The ECM changes the duty signal to the purge VSV so that the intake 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

  • Open or short in purge VSV circuit (3 trip detection logic).

  • Short between EVP1 circuit and power source circuit (3 trip detection logic).

  • Short between EVP1 and ground circuit (3 trip detection logic).

  • Open or short in purge VSV circuit

  • Purge VSV

  • ECM

Tech Tips

DTC P0443 is detected when the engine is warmed up, stops, restarts after 30 seconds, and idles for 1 minute.

WIRING DIAGRAM

A01VI9ME01

CAUTION / NOTICE / HINT

Note


  • Perform idle learning after replacing the ECM Click here.

  • Inspect the fuse for circuits related to this system before performing the following inspection procedure.

Tech Tips

Read freeze frame data using the GTS. Freeze frame data records the engine condition 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. READ VALUE USING GTS (ACTIVATE THE VSV FOR EVAP CONTROL)

    A01VF89E02
    Text in Illustration
    *1 Purge VSV
    *2 Fuel Vapor Feed Hose (to Canister)

    1. Connect the GTS to the DLC3.

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

    3. Start the engine.

    4. Turn the GTS 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 GTS, check whether the port of the purge VSV applies suction to your finger.

      OK
      GTS Operation Specified Condition
      ON Purge VSV port applies suction to finger
      OFF Purge VSV port applies no suction to finger

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

  2. INSPECT PURGE VSV


    1. Inspect the purge VSV Click here.


    NG

    REPLACE PURGE VSV Click here

    OK

  3. CHECK TERMINAL VOLTAGE (PURGE VSV)

    A01VH5KE02
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Purge VSV)

    1. 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
      B61-1 - Body ground Ignition switch ON 11 to 14 V

    NG

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

    OK

  4. CHECK HARNESS AND CONNECTOR (ECM - PURGE VSV)


    1. Disconnect the B97 ECM connector (for LHD).

    2. Disconnect the B101 ECM connector (for RHD).

    3. Disconnect the B61 purge VSV connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      B97-76 (EVP1) - B61-2 Always Below 1 Ω
      B97-76 (EVP1) or B61-2 - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      B101-76 (EVP1) - B61-2 Always Below 1 Ω
      B101-76 (EVP1) or B61-2 - Body ground Always 10 kΩ or higher

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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


    1. Remove the No. 1 integration relay from the engine room relay block.

    2. Disconnect the B61 purge VSV connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1E-4 - B61-1 Always Below 1 Ω
      1E-4 or B61-1 - Body ground Always 10 kΩ or higher

    OK

    CHECK ECM POWER SOURCE CIRCUIT Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR