I'm interested in whether it's time to do the VSV bypass.

I've got a 2008 V8 4runner and Have the CEL with VSV flashing. my torque app is saying I've got a p2433. I've reset the codes, it comes back. I've disconnected the battery, same code returns. Symptoms include limp mode. I can get up to speed on the highway, but only if I drive like a semi...nice and slow...Sneak up on highway speed. If I gun it, I just slowly increase speed.


Page EC-10 of the factory service manual is attached

Checking rear VSV
Step one I do not get enough voltages across the connecting wire. E4-32 to e4-28.

When I check resistance and step two, I do get the correct resistance between the terminals inside the VSV on both, but if I check body to ground I do not get any resistance. It's open. That tells me that a ground wire is disconnected cut or chewed?

The second check of the VSV is blowing air into the bottom tube and I am able to do that. Air will go through and come out the top. That is not to specs.

I cannot blow the other way, from top tube to the bottom, unless I supply 12 volts.. Supplying 12 V allows me to blow the top tube and air comes out the bottom tube.


When I apply a 12 volt charge to the two terminals. I can hear a loud click inside and air moves freely, of course


Checking front VSV
Same behaviors. as above. Which makes me think both VSV didn't fail exactly the same way, it's a ground wire that is cut?


If the VSV's are fine and it's wiring, then I believe to fix it one must remove the intake manifold.

Or...one could do a bypass.

Am I missing anything? I think My results from step 1 (not high enough voltages) and that the VSV isn't closed at rest is telling me contradictory things...I'm assuming that limp mode means the VSV's are closed...but maybe I'm wrong.

Thanks for the look.

 

I even have a 96 T100 four wheel drive SR5 version computerized transmission. Is it possible to skip the vacuum switching valve (vsv) that controls when the truck is going into four wheel drive. Mine wont interact the 4 wheel drive once I shift it into 4 wheel drive. The relay clicks and I checked the voltage at the vsv, it is getting the voltage but the one valve would not near. I concept I study someplace that it may be bypassed, however it didn't supply suitable instruction on the way to do it. I can transfer the vacuum lines at the vsv and it'll cross into 4 wheel drive so I assume I have determined that the vsv is bad. Any help might be favored. I may additionally simply order a brand new valve however concept if it is able to be bypassed with none sick-effect I might simply do this.




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