【1999 Toyota Vitz 】发动机灯亮了 电脑扫描出的结果是：p0171 toyota fuel trim too lean bank 1

xli422

【1999 Toyota Vitz 】发动机灯亮了 电脑扫描出的结果是：p0171 toyota fuel trim too lean bank 1

大伙给点建议 到底是哪里出了问题 网上查了 找到这些：

Trouble Area

Air induction system• Injector blockage• Mass Air Flow (MAF) meter• Engine Coolant Temperature (ECT) sensor• Fuel pressure• Gas leakage from exhaust system• Open or short in A/F sensor (sensor 1) circuit• A/F sensor (sensor 1)• A/F sensor heater (sensor 1)• Integration relay• A/F sensor heater and integration relay circuits• PCV valve and hose• PCV hose connections• ECM

http://share.qclt.com/%E4%B8%B0%E7%94%B0Toyota%20RAV4%20Repair%20Manual/2GR-FE%20Engine%20Control%20System/SFI%20System/0060031.pdf

詹姆斯·瓦特

P0171这个故障码是一个相当麻烦的故障码。说它麻烦，是因为产生这个故障码的原因太多。请楼主提供更多详情，以便给你一个最佳方案。

会员

p0171。。。。。。
给你两个网址，上面写的可能让你明白一些。
http://www.obd-codes.com/p0171
http://www.samarins.com/diagnose/p0171.html

GLoriousegg

你去哪扫描的电脑？求

xli422

詹姆斯·瓦特 发表于 2015-5-16 19:23
P0171这个故障码是一个相当麻烦的故障码。说它麻烦，是因为产生这个故障码的原因太多。请楼主提供更多详情 ...

我更换了空滤 因为老的很脏 结果无改善 还是发动机灯继续亮

我下一步应该换 氧气传感器 还是 火花塞？请各位大侠指教。。。。。。。。。。。。

会员

xli422 发表于 2015-5-27 21:59
我更换了空滤 因为老的很脏 结果无改善 还是发动机灯继续亮

我下一步应该换 氧气传感器 还是 火花塞？请 ...

Causes

A code P0171 may mean that one or more of the following has happened:
•The MAF (Mass Air Flow) Sensor is dirty or faulty
Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
•There could be a vacuum leak downstream of the MAF sensor
•Possible cracked vacuum or PCV line/connection
•Faulty or stuck open PCV valve
•Failed or faulty oxygen sensor (bank 1, sensor 1)
•Sticking/plugged or failed fuel injector
•Low fuel pressure (possible plugged/dirty fuel filter!)
•Exhaust leak between engine and first oxygen sensor

Possible Solutions

A lot of times, cleaning the MAF sensor and finding/fixing vacuum leaks fix the problem. If you're on a tight budget, start there, but that may not be the fix for certain. So, possible solutions include:
•Clean the MAF sensor. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
•Inspect all vacuum and PCV hoses, replace/repair as required
•Inspect all hoses and connections in the air intake system
•Inspect and/or test the intake manifold gaskets for leakage
•Check for a dirty fuel filter and proper fuel pressure
•Ideally you'll want to monitor short and long term fuel trims using an advanced scan tool
•If you have access, you may want to run a smoke test

javing

还能开吗？能开就别管了 Toyota皮带断了照样跑。。

xli422

能开
不是要过WOF了么

詹姆斯·瓦特

xli422 发表于 2015-5-27 21:59
我更换了空滤 因为老的很脏 结果无改善 还是发动机灯继续亮

我下一步应该换 氧气传感器 还是 火花塞？请 ...

这个案例是一个试金石。对它的判断可以检验出你是一个专业人士，还是一个爱好者。
氧传感器很贵，还是三思而后行。最好是确认是坏了才换。火花塞可以看一看。问题多半不在那里。需要更多的车的故障现象来帮助判断。越详细越能帮到你。而有些检测对于DIY来说则是很难完成。

sky9

xli422 不好意思这东西还是要用英文回答。。。

If system is rich you can check the spark plug and coil see if it's firing or missing...

If the system is too lean, there's nothing much you can try, I will check the A/F ratio with wide band sensor see if the reading is right or there might be a fault. AFM could be a problem but I don't see Vitz with this problem EXCEPT boy racer putting an aftermarket air filter in.
ECU fault? nah... they don't die easy... I would still focus on the Oxygen Sensor, to save your money you can always try one from your mate who got the same car.

Finally, if you don't know what you are doing, pass it to your local workshop, with a quotation before you go ahead. this job could be somewhere around $150-$300 with replacing new O2 Sensor. (After Market Bosch, or even Genuine Toyota one)

会员

sky9 发表于 2015-5-31 12:23
xli422 不好意思这东西还是要用英文回答。。。

If system is rich you can check the spark plug and coil ...

我帮你加最后一句，哈哈~~

You can come to CCL workshop, It's easy to fix over.

sky9

会员 发表于 2015-5-31 15:50
我帮你加最后一句，哈哈~~

You can come to CCL workshop, It's easy to fix over.

你没发现我从来不在skykiwi 主动打广告吗？
就算管理员拥有免费的广告我也不打。。。

因为我相信，勉强无幸福。。。　要来的会来：）

happydog1314

Normally you need to do the scope (waveforms) tests for the oxygen sensor, MAP to verify the fault code.
Then do the fuel pressure test (fuel pressure regulator could be wrong)
There is no OBDII in this car so you cannot check the short term fuel trim or long term fuel trim data. The only way we can do is to use the equipment to check if the signal problem or mechanical problem. Then use the common sense to analyze what would cause the lean mixture (more air less fuel).