4wd decided to quit working
- Thread starter thegipper
- Start date
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Start with ADD and VSV (vacuum system). If you are lucky the problem is there. Lucky since it can be fixed cheaper and easily. If not, continue further. You may look at my thread since I was exact in the same boat at last June and have figured it out just a couple of days ago: https://www.toyota-4runner.org/3358467-post1.html
calimobber
Member
You can also check the 4wd fuse but yeah the vacume is a good start.
Any lights at all on the dash? If nothing the fuse would be my first since its not even trying.
Any lights at all on the dash? If nothing the fuse would be my first since its not even trying.
thegipper
New member
I'm going to work on it this morning, thanks for the link to your thread. I'll check the fuse first but when I pull the lever, I do hear a click noise that comes from glove box area (relay?). It makes the same noise when I take it out of 4wd.
Hopefully, it's something simple.
Hopefully, it's something simple.
thegipper
New member
4wd fuse is fine.
I have zero experience working in the 4wd system on these trucks so bare with me.
I tried switching the two hoses but it didn't change anything. But, the two hoses are not even the same size. One is larger than the other? I can't find any pictures that show exactly which hoses to swap so I could be doing it wrong.
Crawled under the truck and don't see anything obvious. At the same time, it's hard to see anything under there.
Not sure how to proceed. If someone could mark up a picture of what needs to swapped/done, that would be helpful.
Thanks
I have zero experience working in the 4wd system on these trucks so bare with me.
I tried switching the two hoses but it didn't change anything. But, the two hoses are not even the same size. One is larger than the other? I can't find any pictures that show exactly which hoses to swap so I could be doing it wrong.
Crawled under the truck and don't see anything obvious. At the same time, it's hard to see anything under there.
Not sure how to proceed. If someone could mark up a picture of what needs to swapped/done, that would be helpful.
Thanks
thegipper
New member
OK I realized I wasn't messing with the correct tubes, I have found them now.
I first checked the manifold to make sure I had vacuum and I did. I also made sure the check valve was working (I can blow in it but you can't suck any air through it) so that appears to be fine.
The orange VSV has vacuum and the black one doesn't when I'm in 2wd.
When I put it in 4wd, neither the orange or black VSVs has vacuum.
So what's next?
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I first checked the manifold to make sure I had vacuum and I did. I also made sure the check valve was working (I can blow in it but you can't suck any air through it) so that appears to be fine.
The orange VSV has vacuum and the black one doesn't when I'm in 2wd.
When I put it in 4wd, neither the orange or black VSVs has vacuum.
So what's next?
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Last edited:
MaineRunna
Member
Sounds like you need a new vacuum switching valve. Unplug them and make sure that you are getting power and ground to them when shifting in and out of 4wd just to rule out the switch on the transfer case or the wiring. A new valve is over $500 from Toyota.
thegipper
New member
Well I fixed it! After finding some write ups and how the system works, it turns out one of the VSVs was bad.
Thankfully I had a spare set on my parts truck. Everything works like it should again.
Everything was working like it should but the one VSV wasnt getting a vacuum when I put it in 4wd.
I used The Durks write up on how to diagnose the system which was spot on.
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Thankfully I had a spare set on my parts truck. Everything works like it should again.
Everything was working like it should but the one VSV wasnt getting a vacuum when I put it in 4wd.
I used The Durks write up on how to diagnose the system which was spot on.
Sent from my SM-N975U using Tapatalk
thegipper
New member
That's what it was. So you're saying a new VSV is 500 bucks? Holy smokes!
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thegipper
New member
It looks like the part is about 90 bucks online 25860-75160 - Toyota Parts Deal)
Are there any differences between the two VSVs? One has a orange connector, the other is blue but they look identical.
Are there any differences between the two VSVs? One has a orange connector, the other is blue but they look identical.
TheDurk
Elite Member
None that I know of.
LittleCaesar
New member
I believe that the vsv that Mike linked is for the EVAP system. I replaced this valve three or four years ago because yours truly broke the plastic piece that attaches to vacuum while replacing wires around there that a rat had decided to munch on.
Nope, the VSV for the 4wd system is a hair under $500 at my dealer as stated earlier in this thread so be glad you had one on hand Mike.
Nope, the VSV for the 4wd system is a hair under $500 at my dealer as stated earlier in this thread so be glad you had one on hand Mike.
thegipper
New member
Crazy. Thanks for clarifying.
I'm glad I had a spare for sure!
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Just check price for the actuator I have mentioned in my post (there is also part # for it) - it is about 1700CAD if you buy it OEM. For one electric motor and two gears and some wires!!!
Nevermind, sorry I was busy whole weekend and I am glad you have figured it out yourself and fixed so cheaply. Great job!
thegipper
New member
Yeah my issue wasn't with the actuator (thankfully) but one of the two VSV's that mount to the drivers fender well in the engine bay. Everything test fine except when I would put it in 4wd, the one VSV wasn't passing/switching the vacuum to engage the actuator. If you're having any 4WD issues, find the write ups that The Durk has made on here and follow his instructions. I understand how the system works now and it is pretty easy to diagnose.
My parts truck has saved my ass so many times now! You can't beat having a spare of basically everything!
My parts truck has saved my ass so many times now! You can't beat having a spare of basically everything!
MaineRunna
Member
Just checked the price of that valve at Jaffarian Toyota in Haverhill, MA; $602.00 my cost, $752.00 list. Always save known good working 4wd VSVs when you get your hands on them.
totally agree...
when your in a pick and pull or a craigslist guy parting out a 4runner...grab them and everything related
sometimes they just think they are trash
unless they are knowledgeable to what they are. me I was lucky and the pick and pull I hit prob figured they were just trash. walked away with everything related and a bunch of other plastic parts for 25
but that does not fix your problem ( my story) I had similar issues and on this forum..thedurk...put it all out clear and easy how to troubleshoot and fix.
you can prob look it up...otherwise he is probably south of the border for the winter now ( I know where....lucky dog) and might not reply fast
you can prob look it up...otherwise he is probably south of the border for the winter now ( I know where....lucky dog) and might not reply fast
