SFI SYSTEM, Diagnostic DTC:P0443

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

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 purge 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

Proper response to ECM command does not occur

(1 trip detection logic)

  • Open or short in purge VSV circuit

  • Purge VSV

  • ECM

WIRING DIAGRAM

A01J33ME01

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)

    A01J32FE04

    1. Disconnect the vacuum hose from the purge VSV.

    2. Connect the intelligent tester to the DLC3.

    3. Enter the engine and turn the intelligent 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.

    5. Place a finger on port E. Check if the disconnected port applies suction to your finger when operating the purge VSV using the intelligent tester.

      Standard
      Tester Operation Specified Condition
      VSV is ON Applies suction to your finger
      VSV is OFF Applies no suction to your finger

    OK

    CHECK FOR INTERMITTENT PROBLEMS

    NG

  2. CHECK ECM (PRG VOLTAGE)

    A01J6AVE17

    1. Turn the ignition switch ON.

    2. Measure the voltage of the E15 and E17 ECM connectors.

      Standard voltage
      Tester Connection Specified Condition
      E15-34 (PRG) - E17-1 (E1) 9 to 14 V

    OK

    REPLACE ECM

    NG

  3. INSPECT PURGE VSV

    OK
    Air flows when battery voltage is applied to purge VSV.

    NG

    REPLACE PURGE VSV

    OK

  4. CHECK WIRE HARNESS (ECM - PURGE VSV)

    A01J3P5E02

    1. Disconnect the E15 connector.

    2. Disconnect the V3 purge VSV connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance
      Tester Connection Specified Condition
      V3-2 - E15-34 (PRG) Below 1 Ω
      V3-2 or E15-34 (PRG) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  5. CHECK WIRE HARNESS (INTEGRATION RELAY - PURGE VSV)

    A01J39QE02

    1. Disconnect the 1J integration relay connector from the engine room junction block.

    2. Disconnect the V3 purge VSV connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance
      Tester Connection Specified Condition
      V3-1 - 1J-5 Below 1 Ω
      V3-1 or 1J-5 - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    INSPECT ECM POWER SOURCE CIRCUIT