|
SU:GH-HT51S:M13A:MIL on:DTC:P150:P0174:LEAN:O2sensor:799:G-scan:
WN16No11p23
G-scan data
IDL,走行とも特別異常を認識されていない。
グラフの状態から、B2 [2-3]のO2sensorの出力が低下している。
他のデータからもそれに伴う挙動が表示されている。
P0150 - O2 Sensor Circuit Malfunction Bank 2 Sensor 1
http://www.autocodes.com/p0150.html
lean fault code
P0171 and P0174 Codes - Dont Replace Oxygen Sensor Before Reading
P0171
P0174 [B2]
http://top-gear-car.blogspot.jp/2009/02/p0171-and-p0174-codes-dont-replace.html
|
P0171 and P0174 Codes - Dont Replace Oxygen Sensor Before Reading
P0171 and P0174 Codes - Don't Replace an Oxygen Sensor Before Reading This
By Dennis Bandy
http://top-gear-car.blogspot.jp/2009/02/p0171-and-p0174-codes-dont-replace.html
2016/7/17(日) 午前 8:10[ ogw*og*3 ]返信する
So your car's CEL (Check Engine Light) is on and you had the codes scanned at a local parts store. Your car has either a P0171, P0174 lean fault code or both stored in the computer, these codes are based on Oxygen Sensor (O-2) readings. A lean code or codes indicate
that there's too much oxygen in the exhaust. Remember parts stores have employees that have good intentions but they may not have the experience necessary to interpret what the trouble codes really mean.
2016/7/17(日) 午前 8:11[ ogw*og*3 ]返信する
These codes are based on oxygen measurements in the exhaust. A common mistake with lean codes is to replace the oxygen sensors. This could be a very expensive mistake that will not fix the problem. Especially if both codes are present, because the chance of both O-2 sensors failing at the same time is very unlikely.
2016/7/17(日) 午前 8:12[ ogw*og*3 ]返信する
Most likely the cause is a vacuum leak. A vacuum leak can be caused from a vacuum hose, intake gasket or maybe even a leak in the air intake hose from the MAF (Mass Air Flow Sensor). Listen for a hissing sound that may lead you to the source of the problem. Some technicians will use a propane bottle with a hose attachment to help pinpoint vacuum leaks.
2016/7/17(日) 午前 8:13[ ogw*og*3 ]返信する
With today's computers it's not quite as easy to check for vacuum leaks this way because the ECU (Electronic Control Unit) will compensate quickly for the added fuel and a change in idle is harder to notice.
Oxygen sensor readings can be monitored with a scan tool while checking for leaks with propane, by looking for increased readings when enriching the mixture.
2016/7/17(日) 午前 8:14[ ogw*og*3 ]返信する
Another way technicians can check for vacuum leaks is with a smoke test. By introducing smoke into a vacuum hose on the engine, the leak will be revealed when the smoke escapes from the problem area.
2016/7/17(日) 午前 8:14[ ogw*og*3 ]返信する
Aftermarket air filters that use oil on the element can sometimes damage the MAF. Over oiling the air filter may allow some excess to get on the MAF sensor wire or element. This can alter the reading, fooling the ECU into seeing more or less air flow therefore changing the air/fuel mixture incorrectly.
2016/7/17(日) 午前 8:15[ ogw*og*3 ]返信する
I once worked on a car that would not start that had a problem with a MAF. When looking at the wire in the MAF, there was a burned piece of trash that made it's way past the air filter. After cleaning the sensor the car ran perfectly.
2016/7/17(日) 午前 8:16[ ogw*og*3 ]返信する
The ash that was on the MAF sensor wire was altering the reading by enriching the mixture so much that the car could not run. After talking with the customer, he said the air filter was just changed. This was obviously when some trash got into the air intake hose that settled on the hot wire of the MAF.
2016/7/17(日) 午前 8:17[ ogw*og*3 ]返信する
Fuel Pressure could also cause a lean condition. If the fuel filter is clogged or the fuel pump pressure is low, there could be higher level of oxygen in the exhaust also. Most of the time though, the ECU will compensate for the reduced fuel volume. So this is one of the least likely causes of a lean code.
http://top-gear-car.blogspot.jp/2009/02/p0171-and-p0174-codes-dont-replace.html
2016/7/17(日) 午前 8:18[ ogw*og*3 ]返信する
AN661WK
弊社製品に関するお問い合わせ、ご不明な点やお気付きの点等ございましたら、
fbl@fujibrake.co.jpまでお問い合わせください。
また、新車種に関する情報や、誤変換等の情報もお待ちしております。
当ホームページの文書・画像等の権利は冨士ブレーキ株式会社に帰属します。
無断使用・転載は堅くお断り致します。
http://www.fujibrake.co.jp/pads/
2017/3/25(土) 午前 7:27[ ogw*og*3 ]返信する
トラックバック先の記事