VSV differences (1 Viewer)

[Seth_O]

Help me understand the differences between VSV's? They seem simple to me, they receive an electrical current and redirect airflow or stop/start it. No power = air flow one direction, power = air flow a different direction.

If they are so simple, why are there different part numbers and vsv's across the Toyota line? It seems like they should be interchangeable (within the same # of ports,) but I cant find substitute PN's for our NLA vsv's in the 60 series?

What am I missing?

 

[POTATO LAUNCHER]

You are correct. On or off is the function. Mounting hardware and port orientation is the main difference. 12v is 12v as long as you wire it for the purpose.
I'm sure there are different models and years that will do the switching. It's a matter of hunting it down.

 

[2mbb]

well, it's not just on/off, but also whether one or both of the lines is vented to atmosphere. If one side of the VSV is connected to a vacuum source and the other side to a vacuum actuated device, it is usually the device side that would be vented...or not vented. Sometimes the vent is routed back to the air cleaner, sometimes it is vented directly from the switch. Here is a diagram from the AI system with two different VSV's. One is not vented and the other vent's through the top of the switch chamber. I saw another one for EGR where the vent goes back to the air cleaner...

 

[OSS]

On the 2F there's basically three different types of VSVs that all do the same thing, although slightly differently.

One of them is a simple on/off valve.
One of them releases built up vacuum to the atmosphere when the valve is actuated (as a pressure release). The third type (used for EGR) does the same but one of the pipes is used for a bleed so it's routed to the air cleaner with a vacuum hose.

They aren't interchangeable on the 2F, but there are VSVs used in other Toyotas that can be used as replacements if they look the same (same piping). The plug will be different, but that's easy to change.

Also within different models of Toyotas, a VSV might have its bracket oriented differently, or have an updated plug end — so it gets a new part number.


2F VSVs below.