DTC    P0443    Evaporative Emission Control System Purge Control Valve Circuit

for Preparation Click here


DESCRIPTION

To reduce hydrocarbon emissions, evaporated fuel 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 VSV (Vacuum Switching Valve for Purge Control) so that the intake amount of hydrocarbon 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)
  1. (a) The target control value and actual control value do not match for 10 seconds or more.
  2. (b) The target control value and actual control value do not match for 80 times or more.
  1. Open or short in purge VSV circuit
  2. Purge VSV
  3. ECM

WIRING DIAGRAM


A201213E05


INSPECTION PROCEDURE

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

HINT:
Read freeze frame data using an 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.

1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (ACTIVATE THE PURGE VSV CONTROL)


    A199328E02

  1. Connect an intelligent tester to the DLC3.

  1. Disconnect the vacuum hose (charcoal canister side) from the purge VSV.

  1. Start the engine.

  1. Turn the tester on.

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

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

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

    Text in Illustration 
    *1
    		Purge VSV
    *2
    		Hose (to canister)

  1. Reconnect the vacuum hose to the purge VSV.



NG
Go to step 2
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.INSPECT PURGE VSV (POWER SOURCE)


    A107917E47

  1. Disconnect the purge VSV connector.

  1. Turn the ignition switch to ON.

  1. 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

    Text in Illustration 
    *1
    		Front view of wire harness connector:
    (to Purge VSV)

  1. Reconnect the purge VSV connector.



NG
Go to step 5
OK


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


    A107919E34

  1. Disconnect the purge VSV connector.

  1. Disconnect the ECM connector.

  1. 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

    Text in Illustration 
    *1
    		Front view of wire harness connector:
    (to Purge VSV)
    *2
    		Front view of wire harness connector:
    (to ECM)

  1. Reconnect the purge VSV connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (Click here)  

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


    A201267E01

  1. Disconnect the purge VSV connector.

  1. Remove the integration relay (EFI relay) from the engine room relay block and disconnect the integration relay connector.

  1. 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

    Text in Illustration 
    *1
    		Front view of wire harness connector:
    (to Purge VSV)
    *2
    		Front view of wire harness connector:
    (to Integration Relay)

  1. Reconnect the purge VSV connector.

  1. Reinstall the integration relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT (Click here)