DESCRIPTION
To reduce HC 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 so that the intake amount of HC emissions is appropriate for driving conditions (engine load, engine speed, vehicle speed, etc.) after the engine is warmed up.
DTC Code | DTC Detection Condition | Trouble Area |
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P0443 | The terminal voltage of the ECM output circuit does not correspond with the drive signals from the ECM to the purge VSV (1 trip detection logic). |
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WIRING DIAGRAM
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. Freeze frame data records the engine conditions when malfunctions are detected. 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
PERFORM ACTIVE TEST USING INTELLIGENT TESTER (ACTIVATE THE VSV FOR EVAP CONTROL)
Connect the intelligent tester to the DLC3.
Remove the vacuum hose of the purge VSV from the charcoal canister.
Start the engine and turn the tester on.
Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VSV for Evap Control.
When the purge VSV is operated using the tester, check whether the disconnected hose applies suction to your finger.
OK | ||||||
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OK |
CHECK FOR INTERMITTENT PROBLEMS Click here |
NG |
INSPECT PURGE VSV
Inspect the purge VSV Click here.
NG |
REPLACE PURGE VSV Click here |
OK |
INSPECT PURGE VSV (POWER SOURCE VOLTAGE)
Disconnect the purge VSV connector.
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
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OK |
CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM) Click here |
NG |
CHECK HARNESS AND CONNECTOR (PURGE VSV - INTEGRATION RELAY)
Disconnect the purge VSV connector.
Remove the integration relay from the engine room relay block.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
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NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
REPAIR OR REPLACE POWER SOURCE CIRCUIT
CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM)
Disconnect the purge VSV connector.
Disconnect the ECM connector.
Measure the resistance between the terminals of the wire harness side connectors.
Standard Resistance | |||||||||
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NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
REPLACE ECM Click here