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2005 Toyota Tundra Question: 2005 Tundra trouble code PO441

 

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bench racer, 4.7L V8, Erie, CO, December 29, 2011, 06:04
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PO441 incorrect purge indicated. I checked the gas cap. disconnected the battery to clear the code, but it returned. Checked all vacuum lines. Lots of valves and gadgets here. Whats the most likely place to start?

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    patrick mannion from Greg Solow's Engine Room, December 29, 2011, 12:24
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     Master

    Make sure no hoses are knocked of or detached at the air filter housing or intake or firewall area of engine compartment. Valves at canisters fail but Toyota sell the whole thing as an assembly. To test the canister and evap system (if there is no visual mechanical damage or hoses knocked off), either the system requires a "smoke machine". Evaporative Emission system problems are difficult for anyone to diagnose/test and repair themselves at home. Some evaporative diagnosis requires a scan tool to bi-directionally control solenoids to seal off and open and test for leaks. Another useful tool is a machine that generates an inert gas/smoke that when the system is sealed off, if there are any leaks the smoke "show up" where they are. Also some faults can be intermittent and when the codes are erased the self test procedures your computer uses to test the system can take a week or two to self complete as a certain specific drive procedure has to be performed.
    There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online . There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online

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