Question about 1997 Toyota T100

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Emission Control Systems Malfunction

Multiple codes showing-PO420,440,441,446. (Oxy sensor,3way cat.malfunct. evap syst.malfunct.,charcoal can, VPS, incorrect purge flow) Seems the vapor pressure sensor is involved on PO441 & 446? Also, some type of incorrect purge flow? I am driving an '01 Toyota Sienna. I replaced the gas cap & (aftermarket) c.converter last yr.. Am told that I missed a svc.bulletin on some computer module which would affect this system. Anyone, got a fix for this problem? I can probably handle the "hands-on" side of this, even manual diagnostics, but I am unsure how to begin to troubleshoot this. I am thinking to purchase a vps & charcoal can. Any advice will be greatly appreciated!!!

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Check the gas cap! However, if you need more ...
We have pictures and our experiences with these codes and how to tell if it's the canister, the valves or the cap.

http://www.findonefindall.com/toyota-sienna/toyota_sienna_evap_P0446.htm

Posted on Aug 28, 2009

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Charcoal cannister is listed on the first 3 codes so changing it would be a good idea. The last code P0446 indicates broken vacuum line or VPS so it looks like you have a good handle on it. If you can rule out any vacuum leaks, then the charcoal cannister and VPS should cure your problem. Best of luck.
Greg

Posted on May 23, 2009

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