The tube seals should protrude slightly so that when they compress you get a good seal, the bridge seal can only go in one way but if you did get it the wrong way around the plastic between the square seals would bottom out and the whole seal would then bend and not seal at all.

 

Yes. Looks just like pin 14 in the other thread I pointed you to. https://landroverforums.com/forum/lr...e2/#post840761

You’re going to need to find an LR4 book and figure the rest of that out. This is the LR3 forum.

 

I had this exact problem a few months back. It’s more likely the pin wasn’t fully seated from the factory and when you unplugged and replugged the connector the wire slid out the back. I bet you’ll find it loose back there.

See this thread:

https://landroverforums.com/forum/lr...-start-113819/

 

The clunky shift from park is because the transmission is in limp mode. I had this when my trans had a live fault code, and it would disappear when the fault wasn’t present (my fault was intermittent). This will go away once the problem is fixed.

 

Well little update here..

took another look at the connector and there are in fact three white weather plugs in the back of it. So I don’t believe I’m missing that third pin, seems like it wasn’t there to begin with.

I also dug a little deeper on the fault code P0500 that I’m getting. According to the workshop manual it’s related to wheel speed sensor. The transmission speed sensor fault codes all start with p07.. as I said above I did remove the front right wheel a couple days before doing the trans work, so it’s possible something happened there. I didn’t check faults between removing wheel and doing trans.

lastly, I’m not sure I’m in limp mode- there’s no check engine light present, and it drives with seemingly full power and rpm range..

I spoke with a very helpful technician from a local LR specialist shop, he thinks the clunky shifts in low range could just be due to a potentially low fluid fill. I’m currently waiting on a couple liters of new fluid to check level and top off as necessary.

when I was doing the fill procedure initially, it would not let me shift past 2nd gear while stopped. On the road it lets me go up all the way but it does seem to only wanna shift up if I’m at a high enough speed. I realize I’m on the LR3 forum here, but if anyone knows of this is normal LR4 behavior please let me know.

While I’m waiting for the new fluid to arrive I plan to investigate a possible wheel speed sensor issue. The local tech also told me if it was that, there would usually be accompanying abs fault codes, which I don’t have, so still a bit of a mystery.

 

 

Yep, looks like the LR4 doesn't use pin 3! Thanks for the update.

 

Update.. still not totally resolved.

Using the gap tool, I was able to get live values from all four wheel speed sensors, ruling out the speed sensor error being from one of the wheels.

I was NOT able to get a live value from one of the two transmission speed sensors.. Turbine speed provides rpm value, but Output Shaft Speed is "N/A". Additionally, Current Engine Torque and Torque Converter Status are "N/A". So it seems like something is up with the output shaft speed sensor.

My next steps are going to be:
1. check/top of the fluid level, then test
2. reset adaptations and do re-learning procedure, then test
3. if still N/A from output shaft speed, then open it up and clean the sensor itself.

Questions:
The workshop manual states the transmission speed sensors "are not serviceable items". Short of cleaning it and checking nothing is obviously broken, does anyone know of anything else I can do? Has anyone here repaired one somehow?

I'm not getting any error codes from the transmission.. if the output shaft speed sensor wasn't working, wouldn't it have thrown a code by now after 100ish miles of driving?

I'll be topping off the fluid tomorrow morning and then we shall see... fingers crossed it's something that simple.

 

Do you know if the LR4 TCM is in the black
plastic housing attached to the valve body? It is on the LR3.

Ford moved to an external TCM on their 6R80 transmissions where that black plastic housing is just an electrical connector with a couple of built-in speed sensors like you’re seeing with yours.

Ford had trouble with their speed sensors failing potentially causing an unexpected downshift like when you’re doing 80 on the freeway and all of a sudden your trans thinks you’re doing 20. They recalled some and extended warranties on some. I have 2 in my family fleet and replaced them both myself before they were recalled. Ford calls it a leadframe, not a TCM.

If the LR4 did the same thing, then maybe you have the same Ford problem. It’s just a guess for me based on my Ford experience. I don’t have any LR4 resources to dig deeper.

I do like your plan of attack above. Just throwing this out for additional thought.

 

The shop manual labels the black plastic piece the TCM, so I'm assuming that it's actually in there!

The only weird shifting I have currently is that it's a little slow to downshift, and in low range changing in and out of park is clunky. The slow downshifts I think have been getting less so over the past week, perhaps due to transmission re-learning with the new fluid in there.

Just hoping it's something simple and not needing to replace the mechatronic.