l**********4
发帖数: 28 | 1 前几天引擎灯亮,去garage查了code，说是P0440，修车师傅说是油箱盖没拧紧，打开使
劲拧了两圈后灯就灭了，今天又亮了，查了code还是P0440。请教版上的大牛说说有可
能是什么问题，修起来大概要多少钱？谢谢！ | g********d
发帖数: 19244 | 2 Evaporative Emission Control System Malfunction
What does that mean?
This indicates that a part of the EVAP control system is no longer
fuctioning correctly. The EVAP system consists of many parts, including (but
not limited to) the gas cap, fuel lines, carbon canister, purge valve, and
other hoses. The (EVAP) emission control system prevents the escape of fuel
vapors from a vehicle's fuel system.
Fuel vapors are routed by hoses to a charcoal canister for storage. Later,
when the engine is running a purge control valve opens allowing intake
vacuum to siphon the fuel vapors into the engine.
Symptoms
You likely won't notice any drivability problems.
Causes
A code P0440 could mean one or more of the following has happened:
The gas cap is not installed or working properly
The purge solenoid has failed
The canister is plugged and not working properly
Possible Solutions
With a P0440 OBD-II trouble code, diagnosis can be tricky at times. Here are
some things to try:
Remove and reinstall the gas cap, clear the code, and drive for a day and
see if the codes come back.
Inspect the EVAP system for cuts/holes in tubes/hoses
Inspect for damaged or disconnected hoses around the Evap purge solenoid
Check and/or replace the sensor
Check and/or replace the purge valve
Have a professional use a smoke machine to detect leaks
【在 l**********4 的大作中提到】
: 前几天引擎灯亮,去garage查了code，说是P0440，修车师傅说是油箱盖没拧紧，打开使
: 劲拧了两圈后灯就灭了，今天又亮了，查了code还是P0440。请教版上的大牛说说有可
: 能是什么问题，修起来大概要多少钱？谢谢！
| q**j
发帖数: 10612 | 3 我的01 Camry有和你一模一样的问题。换了一个新油箱盖也是过一会又亮了。送到
mechanics哪里去是 vacuum solenoid failure。换了就好了。不到200吧，还算便宜。
那个零件就要60-70，而且听说非常难够着。所以不值得dyi。还是给个可信的
mechanics吧。
【在 l**********4 的大作中提到】
: 前几天引擎灯亮,去garage查了code，说是P0440，修车师傅说是油箱盖没拧紧，打开使
: 劲拧了两圈后灯就灭了，今天又亮了，查了code还是P0440。请教版上的大牛说说有可
: 能是什么问题，修起来大概要多少钱？谢谢！
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