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Discussion Starter · #21 · (Edited)
I got the thread title bang on!

Found a technical manual for the box which makes for interesting bedtime reading. Who knew that a harsh kickdown could be because of a split intake pipe? Makes sense when it's in black and white.
Roll on tomorrow for more drama as I get a car I haven't even seen, fixed by someone I haven't even met, in a town that I've never even been to.
What could possibly go wrong!


EDIT: link to manual. https://www.disco3.co.uk/gallery/albums/userpics/51768/ZF_-_TechServiceMan.pdf
 

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Who knew that a harsh kickdown could be because of a split intake pipe?
Small issues sometimes have big consequences.
 

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Input and output shaft sensors in the zf 6HP26 ?


Am I sniffing around the right lamp post here?
As said, without the codes, it's difficult to say for sure. I was under the impression that the gearbox speed sensors failure lead to harsh gear changes and incorrect ratio choices on the road, but suppose it's entirely possible that they could have an effect on engagement.
The symptoms you described fit perfectly with the cable bracket coming loose, but as mentioned earlier, I would expect a Jag/Land Rover specialist to be aware of that possibility and look there pretty much straight away. I actually had one of the bolts fall out completely, what fun that was :rolleyes:.

Without actual codes it is hard to say. My car banged into reverse just because an ABS sensor was duff.
I've also had an ABS sensor cause gearbox issues and flag up the Gearbox fault message, but also got the ubiquitous ABS fault and DSC not available and the EML light on. Funnily enough, that was while driving in a monsoon Just after lock down restrictions were easing, so car hadn't really been used much for a while. Had to limp home with box stuck in what I think was 4th gear, just low enough for it to pull away from stop, but tall enough to manage 50mph once away. A couple of days later when all had dried out, the faults cleared, and all was back to normal. I had an ABS sensor code, and incorrect gearbox ratio code on that occasion, and put it down to the damp and the fact the battery was probably a bit low after the car not being used much. I did bung on a new ABS sensor, but don't think it was entirely necessary.
Again though, if a JLR garage has the car, and the codes, they should have a better idea than us lot sitting in our arm chairs :ROFLMAO:
 

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Discussion Starter · #24 ·
It could be numerous things, including a wet connection, however, the fault he said came up doesn't exist word for word and the only thing I can see immediately related is P0706 and P0825 which is what you mention above. Speed sensors direct faults I can see would be P0715 and P0825.
It's frustrating that he (garage) couldn't remember the code and there's various angles I can look at as to why, good and bad, but I'll have to roll with it for now.

I'll be getting an update off him this afternoon.

On the bright side, as they are JLR specialists, any other crap looking bits would have stood out right?
 
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Discussion Starter · #25 ·
So, Garage is certain that it's the speed sensor. They are sourcing one, which means that between them and the seller, it's getting fixed. Fair play.

It's been a weird week of emotional twists and turns, and not just this, all the important bits haven't turned up for the black car, so I can't fix on that either.
We do have progress though, VIN deets have been added to the signature line and I've developed an unnatural obsession with learning about Jaguar equipped auto boxes.

I guess now, I won't hear anything until Monday, so I'm going to go and get pissed.
 

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Discussion Starter · #26 ·
Bin it, the last thing you want is a Jaguar with weird electrical/mechanical issues..
BRAIN-DOES-NOT-COMPUTE....

 

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I've developed an unnatural obsession with learning about Jaguar equipped auto boxes.
I know the feeling, I developed a much more intimate knowledge of ZF6HP gearboxes than I would have liked after getting my 2.5 :mad: :rolleyes:

At least you've got the heating/climate control issues on the oil burner to keep you out of mischief until either the STR or the parts for the black car arrive ;). Never short of a job when you've got a fleet of Jags :ROFLMAO::ROFLMAO::ROFLMAO:
 

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The time one of my rear ABS sensors failed was the time it felt like I'd run over a 6" speed hump with sharp edges. Unbelievable bang and obvious gearbox fault which cleared with iCarsoft but reappeared immediately at setting off (but no bang). Replaced both sensors and no trouble after that, so you might be premature in thinking it's the 'box at fault.
 

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Discussion Starter · #31 ·
Parts for the black car arrived today! Nothing like leaving it until the last minute royal mail.
This STR gearbox fault is being addressed by others, I've no input but auto boxes have been just a magic box of tricks to me so I'm enjoying getting a better understanding of both the 5R55N (on my black car) and the ZF on this and the diesel.
 

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but auto boxes have been just a magic box of tricks to me so I'm enjoying getting a better understanding of both the 5R55N (on my black car) and the ZF on this and the diesel.
There isn't anything magic about automatics. At least from my point of view. To go into workings of an automatic like the 5R55 or the 6HP26, would be another topic but i think for most users here finding and correcting faults would be more useful.

Most issues occur with low oil level/pressure, old oil or wrong type of oil which can be trace with a pressure test or in most cases with the 5R55 or the 6HP26, electronic related faults, like wiring or a sensor fault (like the ABS sensors) or accumulator issue. Therefore, you need a decent code reader that can read the gearbox and the ABS system as well.
 
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