SFI SYSTEM, Diagnostic DTC:P0443

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

DESCRIPTION

To reduce hydrocarbon (HC) emissions, fuel vapor 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 valve (vacuum switching valve assembly) so that the intake amount 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

All 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 valve circuit

  • Purge valve

  • ECM

WIRING DIAGRAM

A01170QE04

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 intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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 (ACTIVATE THE PURGE VSV CONTROL)

    A011A89E02

    1. Connect the intelligent tester to the DLC3.

    2. Disconnect the vacuum hose (charcoal canister side) from the purge valve.

    3. Start the engine.

    4. Turn the tester on.

    5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VSV for Evap Control.

    6. When the purge valve is operated using the intelligent tester, check whether the port of the purge valve applies suction to your finger.

      OK
      Tester Operation Specified Condition
      ON Purge valve port applies suction to finger
      OFF Purge valve port applies no suction to finger

    7. Reconnect the vacuum hose to the purge valve.


    NG

    INSPECT PURGE VALVE (RESISTANCE) Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

  2. INSPECT PURGE VALVE (RESISTANCE)


    1. A0119R7E01
      Text in Illustration
      *1

      Component without harness connected:

      (purge valve)

      Disconnect the purge valve connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - 2 20°C (68°F) 23 to 26 Ω

    3. Reconnect the purge valve connector.


    NG

    REPLACE PURGE VALVE Click here

    OK

  3. INSPECT PURGE VALVE (POWER SOURCE VOLTAGE)


    1. A01197CE47
      Text in Illustration
      *1

      Front view of wire harness connector:

      (to purge valve)

      Disconnect the purge valve connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      B46-2 - Body ground Ignition switch ON 11 to 14 V

    4. Reconnect the purge valve connector.


    NG

    CHECK HARNESS AND CONNECTOR (PURGE VALVE - INTEGRATION RELAY) Click here

    OK

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


    1. Disconnect the purge valve 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
      B46-1 - B8-62 (PRG) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      B46-1 or B8-62 (PRG) - Body ground Always 10 kΩ or higher

    4. Reconnect the purge valve connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here

  5. CHECK HARNESS AND CONNECTOR (PURGE VALVE - INTEGRATION RELAY)


    1. Disconnect the purge valve connector.

    2. Remove the integration relay.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      B46-2 - 1E-8 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      B46-2 or 1E-8 - Body ground Always 10 kΩ or higher

    4. Reconnect the purge valve connector.

    5. Reinstall the integration relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT Click here