Lexus Troubleshooting Questions? Ask a Lexus Expert
Hi Im David, please allow mw a few minutes to review your information on the vehicle. thank you
P0441 LEXUS - EVAP System Incorrect Purge Flow- replace the purge valve.
P1421 LEXUS - EVAP Canister Gross Leak-replace the purge valve.
the vacuum control valve is not the purge valve
i will send you the diagram of where it is.
I hate lexus sometimes. the purge valve is called a vacuum switching valve on them . my apologies.
yep. thats it. did you check it electrically before replacing?
ok. are you sure the used one was working?
well with out checking it electrically by applying 12vdc to it to verify that it does open we can only assume its working. the next step in troubleshooting the system is to have a smoke test performed to find any leaks within the evap system.
the gross leak at the canister needs to be addressed before chasing p0441.
the last word of that paragraph is "canister.":
P1421 This diagnosis detects leaks in the Evaporative Emission System (EVAP) purge line using engine intake manifold vacuum. If pressure does not increase, the Engine Control Module (ECM) will check for leaks in the line between the fuel tank and EVAP canister purge volume control solenoid valve under the following vacuum test condition. The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve. The EVAP canister vent control valve will then be closed to shut the EVAP purge line off. The EVAP canister purge volume control solenoid valve is opened to depressurize the EVAP purge line using intake manifold vacuum. After this depressurization is implemented, the EVAP canister purge volume control solenoid valve will be closed.
after the car sits, it will be ready to be monitored with a scan tool.
i believe you need to check the charcoal canister for any visual evidence of damage. i.e. cracks, broken connections also.
i think i can get that for you. allow me a few moments
here a layout for you.
Do you still need assistance?