SFI SYSTEM, Diagnostic DTC:P0443

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

DESCRIPTION

Tech Tips

This DTC P0443 is applicable to Mexico models only.

To reduce hydrocarbon (HC) emissions, evaporated fuel from the fuel tank is routed through a canister to the intake air surge tank assembly for combustion in the cylinders.

The ECM changes the duty signals to the purge VSV 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. 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 match for 80 times or more.

  • Open or short in purge VSV circuit

  • Purge VSV

  • No. 1 integration relay

  • ECM

WIRING DIAGRAM

A011T07E01

INSPECTION PROCEDURE

Note

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

Tech Tips

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE

  1. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE VSV FOR EVAP CONTROL)

    1. Disconnect the fuel vapor feed hose assembly (on the canister side) of the purge VSV.

      A011TEKE01
      Text in Illustration
      *1 Purge VSV
      *2 Fuel Vapor Feed Hose Assembly (to Canister)

    2. Connect the Techstream to the DLC3.

    3. Start the engine.

    4. Turn the Techstream 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 Techstream, check whether the port of the purge VSV applies suction to your finger.

      OK
      Techstream Operation Specified Condition
      ON Purge VSV port applies suction to finger
      OFF Purge VSV port applies no suction to finger
    NG

    INSPECT PURGE VSV (RESISTANCE) Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

  2. INSPECT PURGE VSV (RESISTANCE)

    1. Inspect the purge VSV Click here.

    NG

    REPLACE PURGE VSV Click here

    OK

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

    1. Disconnect the purge VSV connector.

      A011TFYE95

    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
      E50-1 - Body ground Engine switch on (IG) 11 to 14 V
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Purge VSV)
    NG

    CHECK HARNESS AND CONNECTOR (PURGE VSV - NO. 1 INTEGRATION RELAY) Click here

    OK

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

    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
      Tester Connection Condition Specified Condition
      E50-2 - E26-48 (PRG) Always Below 1 Ω
      E50-2 or E26-48 (PRG) - Body ground Always 10 kΩ or higher
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here

  5. CHECK HARNESS AND CONNECTOR (PURGE VSV - NO. 1 INTEGRATION RELAY)

    1. Disconnect the purge VSV connector.

    2. Remove the No. 1 integration relay from the engine room relay block and junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E50-1 - 1A-8 Always Below 1 Ω
      E50-1 or 1A-8 - Body ground Always 10 kΩ or higher
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE NO. 1 INTEGRATION RELAY Click here