Cylinder purge valve location and code P0442

Good morning,

The purge valve is located on the canister at the rear of the car mounted on the cross frame.

It is common to replace the entire assembly for this as Toyota does not recommend replacing any components on the canister.

Roy

RELATED VEHICLES: 2002-2005 Camry 2.4L/3.0L. Related vehicles have similar information.

SUMMARY:
P0441 - Evaporative Emissions Control System Incorrect Purge Flow
P0442 - Evaporative Emissions Control System Leak Detected (Small Leak)
P0446 - Evaporative Emissions Control System Vent Control Circuit
When predetermined conditions (closed loop, etc.) Are met, the Evaporative Emission (EVAP) Vacuum Switching Valve (VSV) is opened and stored fuel vapor in the canister is purged to the intake manifold. The ECM changes duty cycle to the EVAP VSV to control purge flow volume. Purge flow volume is determined by the intake manifold pressure. Atmospheric pressure is allowed into the canister through the Canister Closed Valve (CCV) Vent to ensure that purge flow is maintained when negative pressure (vacuum) is applied to the canister. 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.

PROBABLE CAUSES:

Canister Closed Valve (CCV) Vacuum Hose (Air Filter Element Housing Hose)
EVAP Vacuum Switching Valve (VSV)
Fuel Filler Cap
EVAP Canister
Open or Shorted Circuits
DIAGNOSIS:

You Tube - Toyota EVAP Training

1. Perform a visual inspection of the entire EVAP system. Make sure the EVAP hoses are not pinched, cracked, loose or missing, especially the air filter housing hose to the canister closed valve (CCV). Verify the fuel filler cap is correct, not loose or was recently left loose after a fill-up.
-> If the inspection fails repair the malfunction and re-test.
-> If the inspection is ok continue to the next step.

2. Verify the EVAP Canister Closed Valve (CCV or Vent Valve) will hold vacuum. Disconnect the Canister Closed Valve (CCV or Vent Valve) electrical connector and apply B+ power to terminal 2 Black-Red wire and ground terminal 1 the Violet wire. Apply vacuum with a hand held vacuum pump, and monitor the vacuum gauge while energizing and de-energizing the solenoid many times. The CCV is a normally open valve, and should hold vacuum when energized.
-> If the CCV solenoid does not function properly replace it.
-> If the CCV does function properly continue to next step.

3. Verify the Vacuum Switching Valve (VSV) for EVAP solenoid (Purge Valve) will hold vacuum. Disconnect the VSV for EVAP solenoid electrical connector and apply B+ power to terminal 1, Black-White wire and ground terminal 2, Black-White wire. Apply vacuum with a hand held vacuum pump, and monitor the vacuum gauge while energizing and de-energizing the solenoid many times. The VSV for EVAP solenoid is a normally closed valve, and should not hold vacuum when energized.
-> If the VSV for EVAP solenoid does not function properly replace it.
-> If the VSV for EVAP solenoid does function properly continue to next step.

3. Verify the Vacuum Switching Valve (VSV) for Pressure Switching Valve will hold vacuum. Disconnect the VSV for Pressure Switching Valve electrical connector and apply B+ power and ground. Apply vacuum with a hand held vacuum pump, and monitor the vacuum gauge while energizing and de-energizing the solenoid many times. The VSV for Pressure Switching Valve is a normally closed valve, and should not hold vacuum when energized.
-> If the VSV for Pressure Switching Valve does not function properly replace it.
-> If the VSV for Pressure Switching Valve does function properly continue to next step.

4. Smoke test the EVAP system and repair any leaks. Close the CCV and introduce smoke at the EVAP test port. Inspect and repair any leaks.