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Printed at Fri, 13 Apr 2018 18:eighteen:23 +0000
One of the a lot more typical codes that I usually see on a 1997-2001 Toyota 2.2L four-cylinder Camry is a P0401. It is a code that suggests that there is a dilemma with the EGR Method, not necessarily a problem the EGR valve by itself. I listen to stories of men and women pulling receiving this code and changing the EGR Valve without having performing any testing simply because they don’t know what to test. They spend needless income and nonetheless haven’t mounted the difficulty.
There are three areas that will normally make this code appear on your auto. Indeed the EGR Valve is 1 of them, but you also have the EGR VSV, and the EGR Modulator. The first components of inspection will be to check out the function of the EGR Valve by pulling a vacuum on it with a vacuum pump. You can get a vacuum pump at and auto parts keep for close to $ 20 and even hire 1 at some retailers.
Hook up the pump to the only vacuum port on your EGR valve. There will be a tiny hose attached, that you will require to disconnect and set up your pump onto the exact same port. With the motor operating at an idle you need to be in a position to pump the vacuum pump to produce vacuum on the EGR valve. The diaphragm inside of the EGR Valve must raise and trigger the vehicle to die. If your vehicle does die then your EGR Valve and it really is ports are wonderful. If your automobile stumbles or will not have any modify in the way it operates when you are pulling vacuum then you almost certainly have a bad EGR Valve or a clogged port in your consumption.
If you feel you have a poor valve then you need to take it off the motor and check it with the identical vacuum pump. You should be able to see the diaphragm within the valve transfer as you are applying vacuum. If the diaphragm does move then you could have clogged ports in your ingestion and might require to have the intake cleaned. If it does not move then you need to exchange the EGR Valve.
Even so, if your Camry stopped managing when you applied that 1st vacuum then you need to commence searching to the EGR VSV. I know VS what? It truly is a modest blue solenoid found on the back of the engine block. It will have a pair of vacuum hoses, and a tiny plug connected all be held up there with one particular 10-mm bolt. Get rid of the VSV and examination it by applying electricity and floor from your autos battery (VSV should not be plugged into harness when screening.) If you hear the VSV click on when you use electricity then you need to exchange the EGR Modulator.
The EGR Modulator is found to the proper of the EGR Valve previously mentioned your ingestion. It will have many vacuum hoses coming off of it and slides into a holder. The EGR Modulator can be purchased fairly low-cost at your supplier. There is no straightforward tests for the modulator. If you exchange the modulator and nonetheless have a issue and the gentle arrives back on, you need to then replace the EGR VSV also recognized as the Vacuum Switching Valve. Occasionally the VSV can have an inner break and even now click on when you put power and floor to the terminals, but even now be poor.
So you could be wasting your money by just throwing on a valve. Keep in mind the only way to repair something proper is to know the correct screening procedure so you can occur to a appropriate correct.
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Printed at Wed, 11 Apr 2018 fourteen:00:21 +0000