P0443

2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0443: Evaporative Emission Control System Purge Control Valve Circuit

DTC P0443 - Evaporative Emission Control System Purge Control Valve Circuit

DESCRIPTION

To reduce HC emissions, evaporated fuel from the fuel tank is routed through the canister to the intake manifold for combustion in the cylinders.
The ECM changes the duty signal to the purge VSV so that the intake quantity of HC emissions is appropriate for the driving conditions (engine load, engine speed, vehicle speed, etc.) after the engine is warmed up.





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT: Read freeze frame data using the Techstream. 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 TECHSTREAM (PURGE VSV)





(a) Disconnect the vacuum hose from the purge VSV.
(b) Connect the Techstream to the DLC3.
(c) Start the engine and turn the Techstream ON.
(d) Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VSV for Evap Control.
(e) Check if air is sucked into the port when operating the purge VSV using the Techstream.
OK:





NG -- INSPECT PURGE VSV
OK -- CHECK FOR INTERMITTENT PROBLEMS
2. INSPECT PURGE VSV
(a) Inspect the purge VSV (Testing and Inspection).
NG -- REPLACE PURGE VSV
OK -- Continue to next step.
3. INSPECT PURGE VSV (POWER SOURCE VOLTAGE)





(a) Disconnect the purge VSV connector.
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:





NG -- CHECK HARNESS AND CONNECTOR (PURGE VSV - EFI NO. 2 FUSE)
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM)





(a) Disconnect the purge VSV connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM
5. CHECK HARNESS AND CONNECTOR (PURGE VSV - EFI NO. 2 FUSE)





(a) Disconnect the purge VSV connector.
(b) Remove the EFI No. 2 fuse from the engine room relay block.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- CHECK ECM POWER SOURCE CIRCUIT