How To Fix Code P0401 1996 Toyota Rav4

(Disclaimer I'm not a auto mechanic) I show you how I fixed a P0401 check engine light code.

http://rockauto.com/

http://www.toyotanation.com/forum/archive/index.php/t-55168.html

http://www.autoshop101.com/ download #61

How to find a vacuum leak http://youtu.be/9CPqbaSgcok

Category:

Autos & Vehicles

Tags:

• OBD-ll
• P0401
• Trouble
• Code
• Insufficient
• EGR
• Flow
• Exhaust
• Gas
• Recirculation
• check
• engine
• light
• toyota
• rav4
• cleaning
• How-to
• testing
• 1996
• 1997
• 1998
• 1999
• 2000
• 2wd
• 4wd
• ports
• fix
• Cars
• Automobile
• Four-wheel Drive
• car
• repair
• cel
• rav
• smog
• test
• vacuum
• modulator
• valve
• vsv
• Toyota RAV4
• scottykilmer
• scotty
• kilmer
• camry
• 2.0
• Toyota Camry

[mV33rs]

I dont know if I read it wrong but mine has about 1800 ohms of resistance

[joe1951]

@mV33rs Check that your meter is in the right ohm range. If it's still that high it's probably bad. Probably the best way to check it is to apply 12vdc to the terminals with some wire from the car's battery or a nine 9v battery will probably work to, and if it clicks it's good, no click it's bad.

[mV33rs]

@joe1951 just checked, 9v doesnt click, 12 volt it does click :)

[joe1951]

@mV33rs Ok good, well I thought the 9v battery might work, good thing you tried the car battery.

[blackericdenice]

230,000 miles you just broke it in.

[joe1951]

@Sed1999Rav4 I doubt it's the injectors, I would put that at the bottom of the list. I would look into the air/ignition system, cleaning the throttle body with throttle body/carb cleaner, cleaning mass air flow sensor with special mass air flow sensor cleaner, rotor/rotor cap, spark plugs (use the oem denso standard ones), etc. Again I'm not a expert here.

Thanks for watching

[Sed1999Rav4]

@joe1951

Thank you Joe;

As you said the VSV is fine.

I am working on the fuel problem, I put some Chevron Techron (Fuel injector) on an empty tank then I fulled it up with premium gas (Super+) and it is running better but it not enough smooth like it should be.

Any advice and tricks how to check injectors and clean them.

Again tanks a lot.

[joe1951]

@Sed1999Rav4 Continued...

With that being said I would recommend looking for vacuum leaks/kinked lines (I posted a link on how to find vacuum leaks in this videos description). You might want to try spraying the VSV's filter thing with some carb cleaner and see if anything happens. It can still be a fuel problem. I still find it unlikely that it's the VSV without a CEL light tho, but if want to try replacing the VSV it's inexpensive like you said. Let me know the outcome.

Jon

[joe1951]

@Sed1999Rav4 It's hard to diagnose the problem from my computer, I could only give a semi-educated guess. A vacuum switching valve (VSV) is a solenoid valve that controls the vacuum to the EGR valve either off or on. When the engine is cold the VSV is not energized stopping the vacuum from going to the EGR valve. When the engine warms up the VSV is energized allowing vacuum to flow to the EGR valve in which opens the EGR valve. There should be a diagram sticker under the hood.

[Sed1999Rav4]

@joe1951

I took the quote from a forum in RAV4WORLD the post was describing the same symptoms as what I am having with my RAV4.

I thought I’ll give it a try since the part is not that expensive and most people have replaced it

To respond to your question about the hesitation, I haven’t had the hesitation since I replaced the A/F sensor but the RAV4 struggle before going from third to fourth gear and sometimes it does not go at all!

Any idea, I really appreciate.