SFI SYSTEM, Diagnostic DTC:P0443

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

DESCRIPTION

To reduce hydrocarbon 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 quantity of hydrocarbon 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

Both of the following conditions (a) and (b) are met (1 trip detection logic)

(a) The target control value and actual control value do not match for 10 seconds or more.

(b) The target control value and actual control value do not much for 80 times or more.

  • Open or short in purge VSV circuit

  • Purge VSV

  • ECM

WIRING DIAGRAM

A017BF6E16

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)


    1. A017B3EE01

      Disconnect the vacuum hose from the purge VSV.

    2. Connect the intelligent tester to the DLC3.

    3. Start the engine and turn the tester on.

    4. Enter the following menus: Power train / Engine and ECT / Active Test / Activate the VSV for Evap Control.

    5. When the purge VSV is operated using the tester, check whether the port of the purge VSV applies suction to your finger.

      OK
      Tester Operation Specified Condition
      ON (Purge VSV is on) Purge VSV port applies suction to finger
      OFF (Purge VSV is off) Purge VSV port applies no suction to finger

    6. Reconnect the purge VSV connector.


    NG

    INSPECT TERMINAL VOLTAGE (PURGE VSV CONNECTOR) Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

  2. INSPECT TERMINAL VOLTAGE (PURGE VSV CONNECTOR)


    1. A017DJIE03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Purge VSV)

      Disconnect the purge VSV connector.

    2. Turn the ignition switch on (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      B29-1 - Body ground Ignition switch on (IG) 11 to 14 V

    4. Reconnect the purge VSV connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI NO. 3 FUSE - PURGE VSV)

    OK

  3. INSPECT PURGE VSV


    1. Inspect the purge VSV Click here.


    NG

    REPLACE PURGE VSV Click here

    OK

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


    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
      B29-2 (Purge VSV) - B48-18 (PRG) Always Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Condition Specified Condition
      B29-2 (Purge VSV) or B48-18 (PRG) - Body ground Always 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reconnect the purge VSV connector.


    NG

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

    OK

    REPLACE ECM Click here