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

A000ZFOE03
*a from EFI MAIN2 Relay
*b Purge VSV

CAUTION / NOTICE / HINT

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 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 INTELLIGENT TESTER (PURGE VSV)

    A000TRAE01
    *1 VSV is ON
    *2 VSV is OFF

    1. Disconnect the vacuum hose from the purge VSV.

    2. Connect the intelligent tester to the DLC3.

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

    4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VSV for Evap Control. Press the right or left button to turn the VSV ON or OFF.

    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

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

  2. CHECK ECM (PRG VOLTAGE)

    A000YZVE01
    *1 Component with harness connected: (ECM)

    1. 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) Power switch on (IG) 11 to 14 V

    OK

    REPLACE ECM Click here

    NG

  3. INSPECT PURGE VSV (OPERATION OF PURGE VSV)


    1. Inspect the purge VSV Click here.


    NG

    REPLACE PURGE VSV Click here

    OK

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

    A000ZWOE01
    *1 Front view of wire harness connector: (to Purge VSV)
    *2 Rear view of wire harness connector: (to ECM)

    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 (Check for open)
      Tester Connection Condition Specified Condition
      E44-1 - E1-17 (PRG) Always Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Condition Specified Condition
      E44-1 or E1-17 (PRG) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (PURGE VSV - EFI FUSE)

    A000V84E01
    *1 Front view of wire harness connector: (to Purge VSV)
    *2 Front view of wire harness connector: (Engine Room No. 2 Relay Block)

    1. Disconnect the purge VSV connector.

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

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

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

    OK

    INSPECT ECM POWER SOURCE CIRCUIT Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR