TO:DTC:P0420:
[76]
いたかめ さん、まだそのDTC:の事例など収録してないので T/Bさせて頂ます。
下流のセンサでの観察スレッドは時々拝見してますが、DTC:との関連ではまだ未収録でした。
下流センサの観察データは紹介されたりしてますが、他の排ガステスタなどの関連としてのものは
まだ少ないようです。
ziziさんも関心を示す、排ガスの値で 以前からCO2も一部加えたものを別な視点で記録してますが
そこにも触媒の反応を反映しているのかと思えるケースも稀にみかけます。 一部のファクターで
複数な項目の複雑な状態を推察、把握するには結構難しいものがありそうです。
某社の結構排気ガスがNGになりそうもないものでも、予想外にパスできないケースを最近散見します。
そこにも触媒の反応も影響している場合もあるようだ。
さて、診断器の対応が いたかめ さんも指摘されてますが、同じような逆輸入車で似たケースが
あり、HDM3Kではなく違う機種で対応した。 手元の古いTO:国産資料でもDTC:にP0420の項目が無い。
国産も、国外社と同じ傾向があるので、P0420の対応もサーチしておきたい。
コメント（14）
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P0420 - Catalyst System Efficiency Below Threshold (Bank 1)
http://www.obd-codes.com/p0420
http://www.aa1car.com/library/p0420_dtc.htm
2010/7/11(日) 午後 0:52
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A P0420 code is a trouble code on OBD-II equipped vehicles. All vehicles from 1996-newer sold in North America support this generic powertrain code. This code is a pretty common one and this site is here to help the average do-it-yourself (DIY) car owner (like you) troubleshoot, diagnose, and fix their vehicle themselves when presented with a P0420 code, saving money.
http://www.p0420.com/
2010/7/11(日) 午後 0:53
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If your car has multiple trouble codes (DTC's), it's always a good idea to fix them in the order they come up on the code reader. For example, if you have these codes - P0300, P0420, P0171, then you're going to want to tackle the P0300 Random Misfire code first (resolve it), and then tackle the P0420 code, etc. The reason for that is that the first code could be causing further DTCs to be set.
http://www.p0420.com/
2010/7/11(日) 午後 0:53
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Common Problems That Trigger the P0420 Code
Inefficient Catalytic Converter(s)
Defective Front or Rear Oxygen Sensor(s)
Misfiring engines
http://repairpal.com/OBD-II-Code-P0420
2010/7/11(日) 午後 0:57
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Common Misdiagnoses
Oxygen Sensors
Polluting Gases Expelled
HCs (Hydrocarbons): Unburned droplets of raw fuel that smell, affect breathing, and contribute to smog
CO (Carbon Monoxide): Partially burned fuel that is an odorless and deadly poisonous gas
NOX (Oxides of Nitrogen): One of the two ingredients that, when exposed to sunlight, cause smog
http://repairpal.com/OBD-II-Code-P0420
2010/7/11(日) 午後 0:58
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How does a P0420 code trigger the check engine light? This code will trigger the check engine light as follows:
1996-newer (OBD-II) vehicles use oxygen sensors and a catalytic converter to reduce emissions. There is one O2 (oxygen) sensor in front of the catalytic converter (called upstream), and one behind it (downstream).
http://www.engine-light-help.com/P0420-check-engine-light.html
2010/7/11(日) 午後 2:27
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When the engine is warmed up and running normally the upstream oxygen sensor reading fluctuates and the downstream one is fairly steady. In the case where both readings are fairly steady, a P0420 check engine light code is set.
Possible Causes:
Oxygen (O2) sensor not working correctly
Damaged or leaking exhuast (pipe, manifold, catalytic converter)
Damaged catalytic converter
Diagnostic Help:
2010/7/11(日) 午後 2:29
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To diagnose a P0420 trouble code we begin by checking for exhaust leaks under the vehicle. Then use an oscilliscope to check the waveforms of both upstream and downstream O2 sensors. The front reading should vary, the rear should be steady. Replace as necessary. Check the rear Heated O2 Sensor.
2010/7/11(日) 午後 2:31
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The catalytic converter is probably the most important emission control device on a vehicle because it cleans up the pollutants in the exhaust. Thanks to fuel injection, oxygen sensors in the exhaust manifolds, and a feedback fuel control system, emissions are kept to a minimum. Even so, some pollution is still produced and must be eliminated by the converter.
http://www.brakeandfrontend.com/Article/38643/catalytic_converter_diagnosis.aspx
2010/7/11(日) 午後 2:35
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So the converter must be in good condition and working correctly to keep tailpipe emissions to an absolute minimum. And if there’s a problem? Then your customer’s vehicle will probably need a new converter.
Converter problems typically fall into one of five categories:
1. Plugged converter (partially or completely);
2. Dead converter;
3. Marginal converter (still working, but efficiency is down);
4. Damaged converter (rust or physical damage); or
5. Missing converter (somebody
2010/7/11(日) 午後 2:36
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http://www.koiautoparts.com/techtips/articles/102609_catalytic_converter_diagnosis.pdf
2010/7/11(日) 午後 2:45
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shau1701さん、大気組成は
以下なども参照ください。
CO2:CO:HC:NOx:O2:（大気N2:78%,O2:21%）大気の組成
http://blogs.yahoo.co.jp/ogw2ogw2/27010299.html
CO2の値もいくつかアップしてますので、サーチください。
ziziさん、NOxも測定できているのですね。 燃焼後の
酸化、還元、吸着の相互作用は内部反応なので手持ちのツールで
何か目安が付くと助かります。
2010/7/11(日) 午後 3:47
2010/7/11(日) 午後 3:54
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P0420
C1201
C1203
Hi i got a corolla verso on 2006 plate.
http://www.toyotaownersclub.com/forums/topic/166665-help-please/?utm_medium=twitter&utm_campaign=twitterfeed&utm_source=twitterfeed
2015/10/4(日) 午前 2:13[ ogw*og*3 ]返信する
After a run on motorway my trc, vsc and engine management lights came on.
Local independent garage got 3 error codes: c1203, c1201 and p0420.
he reset everything and said it was probably just some sensor, but took car on motorway run and same lights came on again. Can anyone shed some light, dont think the guy at the garage was that clued up on toyotas as he mainly deals with vauxhalls and dont want to take it to dealers.
Or does anyone know of a good independent mechanic in bolton a
2015/10/4(日) 午前 2:13[ ogw*og*3 ]返信する