Question about Toyota RAV4

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The check engine light of my Toyota Rav 4 has started to light several weeks ago,I took my car to the workshop.The technician used scan tool for diagnosis.The OBD was P0400,EGR malfunction.He took measures to repair the car on the basis of the diagnosis made.He told me to take my car.After I drove for about 3 Km the check engine light started to light once again.I took it to the workshop back but he could not help me in solving the problem.What shall I do.

Posted by Anonymous on

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A code P0400 may mean that one or more of the following has happened:
• Plugged EGR passage which restricts the flow of exhaust gasses
• Faulty EGR solenoid
• Faulty EGR solenoid wiring/harness
• Vacuum lines damaged/disconnected to the EGR valve solenoid or to the EGR valve
• Faulty EGR valve

Posted on Jun 16, 2017

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Posted on Jan 02, 2017

  • 2 Answers

SOURCE: I got the code p0400 1.

first take the egr valve off then get some carb cleaner spray it into the egr valve ports let sit 30-60min then take a small flat head clean any carbon left over in it. then check the vaccume lines to it they to might be plugged you can take a small wire or push pin and stick it in the ports to unplug it.

Posted on Sep 06, 2008

SOURCE: EGR code P0400... Found EGR

suspect bad vaccum switch to egr
joss605

Posted on Sep 06, 2008

emissionwiz
  • 75797 Answers

SOURCE: Truble code p0400

the passage that causes this low flow is in the intake, it gets full of carbon and gunk, try running a wire through it, also make sure the EGR passes a functional test.

Posted on Dec 15, 2008

FoRdMaStEr
  • 51 Answers

SOURCE: no vacuum to egr valve

there is an EGR vacuum solenoid somwhere that controls on/off vacuum to actuate the valve. i am not to sure of the location, but follow the vacuum line back from the egr until you find a device that looks like an electrical check valve for vacuum. that is a possibilty. but then again i am a ford,chrysler guy and am just giving you an answer based on my understanding of the functuality of a vacuum egr system

Posted on Jan 15, 2009

motor1258
  • 6674 Answers

SOURCE: OBD code 0401 (1997 Toyota Camry 4 cyl)

There is a VSV (vacuum switching valve) , usually mounted on the back side of engine block, under the intake manifold, as well as the map sensor, that can also cause that code if one or the other is faulty. It takes some pretty detailed troubleshooting to confirm this in some cases, so if that's not in your line of work, you may have to have it properly diagnosed, or take a 50/50 shot at which one first.

Posted on Jan 24, 2009

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