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Vehicle does not Move when the transmission is shifted into reverse

Tiny
MALLYBOY
  • MEMBER
  • 1999 TOYOTA SIENNA
  • 3.0L
  • V6
  • 2WD
  • AUTOMATIC
  • 102,567 MILES
This vehicle started this problem after a long city drive. It stopped driving forward and reverse, I disconnected the cooling line hose to the radiator, and I started the vehicle, unfortunately oil was not pumping out from that cooling line hose on the body of the transmission. Then I dropped the transmission and replaced the transmission pump. Then after some time, it started again and I noticed that water has mixed with the transmission fluid. I replaced the transmission oil, valve-body and transmission filter. It drives forward but doesn't move in reverse. Then I dropped the gear again and overhauled it. I replaced the disc and clutches and assembled back but it only drives forward. Who could know the reason why it doesn't move in reverse?
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Monday, February 14th, 2022 AT 12:17 PM

5 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Sorry for the delay. Looks like we had someone post some spam which dropped this to the bottom of our list. I deleted the spam.

Based on this info I would suggest we double check and make sure the fluid is full. I assume it is but here is a guide that will help:

https://www.2carpros.com/articles/how-to-check-and-add-transmission-fluid

If the fluid is full then we need to do a pressure test and find out if this is low in reverse which I suspect it is.

This means we are most likely going to find an issue in the unit, but we need to start with this.

I am attaching the process below and the proper pressures.

Then if you find it low in reverse only, the chart below will tell us what the issue is going to be.

Let me know what you find with this.
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Tuesday, February 15th, 2022 AT 10:29 AM
Tiny
MALLYBOY
  • MEMBER
  • 302 POSTS
Okay! Thank you, I will get back to you.
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Wednesday, February 16th, 2022 AT 1:58 AM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Sounds great. Thanks for the update. We will be here when you get back to us.

Thanks
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Wednesday, February 16th, 2022 AT 9:46 AM
Tiny
MALLYBOY
  • MEMBER
  • 302 POSTS
I have checked the body valve and noticed that about 4-bolts were not tightened on the valve body, so I will look for bolts and tight it there and recheck if the missing bolt caused internal leaks to reverse.
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Thursday, February 17th, 2022 AT 1:10 AM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Great find. Thanks for the update and let us know what happens. Thanks
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Thursday, February 17th, 2022 AT 9:03 AM

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