SFI SYSTEM (w/ Electronic Throttle Control System), Diagnostic DTC:P0443

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

DESCRIPTION

In order to reduce hydrocarbon (HC) 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 EVAP VSV so that the intake 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

  • Open or short in Purge VSV circuit (3 trip detection logic)

  • Short between EVP1 circuit and power source circuit (3 trip detection logic)

  • Short between EVP1 and ground circuit (3 trip detection logic)

  • Open or short in Purge VSV circuit

  • Purge VSV

  • ECM

Tech Tips

DTC P0443 is detected if the engine is warmed up and then stopped, and restart it after 30 seconds and let it idle for 1 minute.

WIRING DIAGRAM

A0136J4E01

INSPECTION PROCEDURE

Note

After replacing the ECM, perform electronic throttle learning Click here.

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. INSPECT PURGE VSV (RESISTANCE)

    A0138KJE07

    1. Disconnect the purge VSV 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) 26 to 30 Ω

    3. Reconnect the purge VSV connector.


    NG

    REPLACE PURGE VSV Click here

    OK

  2. INSPECT TERMINAL VOLTAGE (PURGE VSV CONNECTOR)


    1. A0137F5E04

      Disconnect the purge VSV 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
      B11-2 - Body ground Ignition switch ON 11 to 14 V

    4. Reconnect the Purge VSV connector.


    NG

    CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK - PURGE VSV) Click here

    OK

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


    1. A0136XME01

      Disconnect the ECM connector.

    2. Disconnect the purge VSV connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      B11-1 (Purge VSV) - B25-22 (EVP1) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      B11-1 (Purge VSV) or B25-22 (EVP1) - 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

    OK

    REPLACE ECM Click here

  4. CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK - PURGE VSV)


    1. A013838E03

      Remove the engine room relay block.

    2. Remove the engine room relay block lower cover.

    3. Disconnect the purge VSV connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      B11-1 (Purge VSV) - 1C-5 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      B11-1 (Purge VSV) or 1C-5 - Body ground Always 10 kΩ or higher

    5. Reinstall the engine room relay block.

    6. Reconnect the purge VSV connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT Click here