P0443

1UR-FE ENGINE CONTROL: SFI SYSTEM: P0443: Evaporative Emission Control System Purge Control Valve Circuit
P0443 - Evaporative Emission Control System Purge Control Valve Circuit

DESCRIPTION

HINT
DTC P0443 is applicable to Mexico models only.

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.





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
Read freeze frame data using the Techstream. Freeze frame data records the engine condition 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

1. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE VSV FOR EVAP CONTROL)

(a) Connect a Techstream to the DLC3.





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

(c) Start the engine.

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VSV for EVAP Control.

(f) When the purge VSV is operated using the Techstream, check whether the port of the purge VSV applies suction to your finger.

OK:





(g) Reconnect the vacuum hose to the purge VSV.

NG -- INSPECT PURGE VSV (RESISTANCE)

OK -- CHECK FOR INTERMITTENT PROBLEMS Check for Intermittent Problems

2. INSPECT PURGE VSV (RESISTANCE)

(a) Disconnect the purge VSV connector.





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

Standard Resistance:





(c) Reconnect the purge VSV connector.

NG -- REPLACE PURGE VSV Removal
OK -- Continue to next step.

3. INSPECT PURGE VSV (POWER SOURCE)

(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 - INTEGRATION RELAY)
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 Removal

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

(a) Check the EFI NO. 2 fuse.





(1) Remove the EFI NO. 2 fuse from the engine room relay block.

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

Standard Resistance:





(3) Reinstall the EFI NO. 2 fuse.

(b) Disconnect the purge VSV connector.

(c) Remove the integration relay from the engine room relay block.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR OR REPLACE FUSE

OK -- CHECK ECM POWER SOURCE CIRCUIT Component Tests and General Diagnostics