SFI SYSTEM, Diagnostic DTC:P0444 and P0445

DTC Code DTC Name
P0444 Evaporative Emission System Purge Control Valve "A" Circuit Open
P0445 Evaporative Emission System Purge Control Valve "A" Circuit Shorted

DESCRIPTION

To reduce hydrocarbon (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 signals to the purge VSV (Vacuum Switching Valve for Purge Control) so that the intake amount of hydrocarbon (HC) emissions is appropriate for the driving conditions (engine load, engine speed, vehicle speed, etc.) after the engine is warmed up.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P0444

Evaporative Emission System Purge Control Valve "A" Circuit Open

Open or short to ground in purge VSV circuit.

  • Purge VSV

  • Wire harness or connector

  • ECM

Comes on

DTC stored

P0445

Evaporative Emission System Purge Control Valve "A" Circuit Shorted

Short to +B in purge VSV circuit.

  • Purge VSV

  • Wire harness or connector

  • ECM

Comes on

DTC stored

MONITOR DESCRIPTION

These DTCs are stored when a malfunction is detected in the purge VSV circuit. If there is an open or short in the purge VSV circuit, the ECM will illuminate the MIL and store a DTC.

WIRING DIAGRAM

A330029E01

PROCEDURE

  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0444 AND/OR P0445)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Trouble Codes.

    5. Check for DTCs.

      Powertrain > Engine > Trouble Codes

    Result

    Result

    Proceed to

    DTC P0444 and/or P0445 is output

    A

    DTC P0444 and/or P0445 and other DTCs are output

    B
    Tip:

    If DTC P0444 and/or P0445 and P0685, P2670 or P2685 are output simultaneously, troubleshoot for DTC P0685, P2670 or P2685 first.

    B

    GO TO DTC CHART

    Click here

    A

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

    1. Disconnect the purge VSV connector.

    2. Disconnect the heated oxygen sensor (sensor 1 and sensor 2) connectors.

    3. Disconnect the ECM connectors.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      B48-1 - B56-24 (EVP1)

      Always

      Below 1 Ω

      B48-2 - B55-41 (+B)

      Always

      Below 1 Ω

      B48-1 or B56-24 (EVP1) - Body ground and other terminals

      Always

      10 kΩ or higher

      B48-2, B35-1 (+B), B52-1 (+B) or B55-41 (+B) - Body ground and other terminals

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE PURGE VSV

    1. Replace the purge VSV.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  4. CHECK WHETHER DTC OUTPUT RECURS (DTC P0444 OR P0445)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs.

      Powertrain > Engine > Clear DTCs

    5. Turn the ignition switch off and wait for a few minutes.

    6. Perform the drive test.

    7. Turn the GTS on.

    8. Enter the following menus: Powertrain / Engine / Trouble Codes.

    9. Check for DTCs.

      Powertrain > Engine > Trouble Codes

    Result

    Result

    Proceed to

    DTC P0444 or P0445 is output

    A

    DTCs are not output

    B
    A

    REPLACE ECM

    Click here

    B

    END