SFI SYSTEM, Diagnostic DTC:P0444

DTC Code DTC Name
P0444 EVAP System Purge Control Valve "A" Circuit Open

DESCRIPTION

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0444 EVAP System Purge Control Valve "A" Circuit Open

DTC Detection Condition


    Enable Criteria

  • Engine running

  • Purge valve state closed


    Malfunction Criteria

  • -


    Diagnostic Mask

  • The MIL will be illuminated if these faults are present for 2 consecutive trips


    Monitor

  • -


    Potential failure modes

  • Purge valve/wiring open circuit

  • Open or short in purge VSV circuit

  • Purge VSV

  • ECM

 Comes on DTC stored

MONITOR DESCRIPTION

When the engine is running the ECU continuously monitors the status of the evaporative emission components for open circuit or short to. The feedback signal should be low when turned ON and high when turned OFF. The following codes will be set if the above conditions are not met.

WIRING DIAGRAM

B0047GCE03
*a EFI MAIN
*b Purge VSV
*c MAIN
*d Battery

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following procedure.

Tech Tips

Read freeze frame data using the GTS. 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 GTS (ACTIVATE THE VSV FOR EVAP CONTROL)


    1. B0047ZFC10
      *a Reference
      *b VSV ON
      *c VSV OFF

      Disconnect the fuel vapor feed hose (charcoal canister side) of the purge VSV.

    2. Connect the GTS to the DLC3.

    3. Start the engine.

    4. Turn the GTS on.

    5. Enter the following menus: Powertrain / Engine / 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 your finger.

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

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

  2. INSPECT PURGE VSV


    1. Inspect the purge VSV.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE PURGE VSV Click here

    OK

  3. CHECK TERMINAL VOLTAGE (POWER SOURCE OF PURGE VSV)


    1. B0046TBC01
      *a

      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
      B120-2 - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT EFI MAIN RELAY Click here

    OK

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


    1. Disconnect the B120 purge VSV connector.

    2. Disconnect the B142 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B120-1 - B142-14 (PRG) Always Below 1 Ω
      B120-1 or B142-14 (PRG) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. INSPECT EFI MAIN RELAY


    1. Inspect the EFI MAIN relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE EFI MAIN RELAY

    OK

  6. CHECK HARNESS AND CONNECTOR (EFI MAIN RELAY - PURGE VSV)


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

    2. Disconnect the B120 purge VSV connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (EFI MAIN relay holder) - B120-2 Always Below 1 Ω
      3 (EFI MAIN relay holder) or B120-2 - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    CHECK ECM POWER SOURCE CIRCUIT Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR