SFI SYSTEM (w/ Secondary Air Injection 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 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

Proper response to ECM command does not occur

(1 trip detection logic)

  • Open or short in EVAP VSV circuit

  • EVAP VSV

  • ECM

WIRING DIAGRAM

A01BH3YE01

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 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 INTELLIGENT TESTER (EVAP VSV)


    1. A01BCWSE02

      Disconnect the vacuum hose of the EVAP VSV.

    2. Connect the intelligent tester to the DLC3.

    3. Start the engine and turn the intelligent tester ON.

    4. Select the following menu items: Powertrain / Engine and ECT /Active Test / Activate the VSV for EVAP Control.

    5. Check if the disconnected port applies suction to your finger when operating the EVAP 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

    6. Reconnect the vacuum hose.


    OK

    CHECK FOR INTERMITTENT PROBLEMS

    NG

  2. INSPECT ECM (CHECK VOLTAGE)


    1. A01BDNSE27

      Turn the ignition switch to the ON position.

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

      Voltage
      Tester Connection Specified Condition
      PRG (D3-23) - E01 (D1-7) 9 to 14 V

    OK

    REPLACE ECM

    NG

  3. CHECK OPERATION OF EVAP VSV

    OK
    Air flows when the battery voltage is applied to the EVAP VSV.

    NG

    REPLACE EVAP VSV

    OK

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


    1. A01BGFCE01

      Disconnect the D3 ECM connector.

    2. Disconnect the D28 EVAP VSV connector.

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

      Resistance (Check for open)
      Tester Connection Specified Condition
      EVAP VSV (D28-1) - PRG (D3-23) Below 1 Ω
      Resistance (Check for short)
      Tester Connection Specified Condition

      EVAP VSV (D28-1) or PRG (D3-23) -

      Body ground

      		 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reconnect the EVAP VSV connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (EVAP VSV - INTEGRATION RELAY)


    1. A01BB2JE01

      Remove the integration relay from the engine room R/B No.1.

    2. Disconnect the D28 EVAP VSV connector.

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

      Resistance (Check for open)
      Tester Connection Specified Condition
      EVAP VSV (D28-2) - integration relay (B4) Below 1 Ω
      Resistance (Check for short)
      Tester Connection Specified Condition
      EVAP VSV (D28-2) or integration relay (B4) - Body ground 10 kΩ or higher

    4. Reinstall the integration relay.

    5. Reconnect the EVAP VSV connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    INSPECT ECM POWER SOURCE CIRCUIT