P0443

1NZ-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
HINT: This 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 a Techstream. Freeze frame data record 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 (canister side) from the purge VSV.
(c) Start the engine.
(d) Turn the tester ON.
(e) Select the following menu items: 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
2. INSPECT PURGE VSV (RESISTANCE)




(a) Disconnect C3 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
OK -- Continue to next step.
3. INSPECT PURGE VSV (POWER SOURCE)




(a) Disconnect the C3 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:





(d) Reconnect the purge VSV connector.
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 C3 purge VSV connector.
(b) Disconnect the C20 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for open):






Standard Resistance (Check for short):





(d) Reconnect the purge VSV connector.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM
5. CHECK HARNESS AND CONNECTOR (PURGE VSV - INTEGRATION RELAY)




(a) Disconnect the C3 purge VSV connector.
(b) Remove the integration relay from the engine room relay block.
(c) Check the resistance.
Standard Resistance (Check for open):






Standard Resistance (Check for short):





(d) Reconnect the purge VSV connector.
(e) Reinstall the integration relay.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT