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 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

WIRING DIAGRAM

A0161U0E10

INSPECTION PROCEDURE

Tech Tips

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.

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (PURGE VSV)

    A016199E01

    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

    6. Reconnect the vacuum hose to the purge VSV.


    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

    REPLACE ECM Click here

  3. INSPECT PURGE VSV (POWER SOURCE)


    1. A015Z5LE07

      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
      E77-2 - Body ground Engine switch on (IG) 11 to 14 V

    4. Reconnect the purge VSV connector.


    NG

    INSPECT FUSE (EFI NO. 2 FUSE) Click here

    OK

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

    A0161ZXE05

    1. Disconnect the purge VSV connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      E77-1 (purge VSV) - E3-17 (PRG) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      E77-1 (purge VSV) or E3-17 (PRG) - Body ground Always 10 kΩ or higher

    4. Reconnect the purge VSV and ECM connectors.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - PURGE VSV)

    OK

    REPLACE ECM Click here

  5. INSPECT FUSE (EFI NO. 2 FUSE)


    1. A015YXDE06

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      EFI No. 2 fuse Always Below 1 Ω

    3. Reinstall the EFI No. 2 fuse.


    NG

    REPLACE FUSE (EFI NO. 2 FUSE)

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI MAIN RELAY - PURGE VSV)