I bought my jag about a year ago and it had the squawk on 3-4 shift issue. I've changed the fluid + filter/pan and then followed up with another flush 4 months ago. ZF LG6 used both times. The squawk issue remains. If anything it might actually be more prominent than before??

I've been trying to find the additive the TSB JTB00070 calls for (c2c37157), but it cannot be found anywhere.

I've read in multiple places the newest version of the LG6 fluid has the additive included; but I think that claim is bullsh*t since my squawk noise hasnt improved at all between both my fluid changes.

Is there something else I can do about this damn noise?

 

The only fix I've seen is the fluid additive and yes, it is now incorporated into the current ZF fluid. It isn't made anymore.

The only bottle I've seen was on eBay and Magmedia outbid me on it. He may still have it and you can reach out to him.

 

I attached the wrong doc but see in this one - page 929. Make sure your Transmission falls within the noted serial number:
"LifeGuardFluid1 (Additive for 6HP26 Only)
Use only to cure squawking on 3-4 shift, should be added to LifeGuardFluid6 only in accordance with the ZF technical note
below:
ZF Technical Note.
All transmissions built on line one with a serial number above 520000 as well as those built on line 2 with a serial number above serial number 4100000 have the later type friction plates fitted and should not be treated with this additive.
This Additive should only to be used if squawk is an issue on transmissions with serial number below the cut off numbers listed above. It must only be used once in a transmission, the excetion to this rule is if the transmission has had a complete fluid change."

 

Sean - Great info, thanks.

I am reluctant in believing the latest LG6 formula has this additive; my squawk literally did not improve at all; in fact it may even be more pronounced after the 2 fluid changes.
I wonder who made this additive? I really wish I could find some..

 

LifeGuard fluid 1 was made by Lifeguard:-) See if Magmedia has the last remaining liter on earth. It is rare. Outside of a re-flash, which may or may not help, I'm out of ideas.

 

Seems the cause could even be an actual fault. Whether worth fixing... ask a gearbox specialist I suppose.

 

Have you reset the adaptations and reconfigured the TCM? I would reflash both the TCM and PCM (the powertrain module learns from the trans module). Then I would carry out the recommended adaption cycle.
This process has improved shift smoothness for my tranny, but I didn't have the squawk.

 

Hi stham,

I was just about to recommend clearing the adaptations and reflashing the Mechatronic when I saw Victor's post pop up. Consider this a ditto.

Also, I assume you've had your car scanned for fault codes, but have you had it scanned by a system capable of reading the proprietary Jaguar DTCs? There might be some clues there.

P.S. Do you mean that you have twice done a full flush of all the fluid in the transmission, or did you only drain and refill the fluid without truly flushing all of it (per the cooler lines)? If you've only done drains and refills, you probably still have a significant percentage of old fluid in the transmission.

Cheers,

Don

 

Vic & Don, thanks for the information.

Connecting a laptop and reflashing/clearing adaptations is on the to do list. I just bought JLR SDD v131.03 (per a thread where you recommended that version Don ) and have an old XP laptop stashed away somewhere
I have a feeling this will help shifting. I have some shifting harshness when i first start up on cold days too.

I drained and refilled the transmission twice. I know the capacity is something like 10 liters, I got about 6.5 Quarts out the first time and about 5-6 quarts out the second time. I recognize i havent gotten all of the 'old' fluid out. but 2 drain/refills should dam near replace a good majority of the fluid. I would think these 2 changes would've helped the squawk issue, but it really didnt help at all!

 

You've probably got at least a quart or two of old fluid in there, but we would have expected two drains and fills to have made at least a little difference.

ZF Lifeguard 6 is made by Shell, so it's quite possible the additive is also made by Shell, but I haven't done any research on it. If you don't already have it, I'm attaching the Jaguar 6HP26 Troubleshooting Guide which confirms that the additive is Jaguar's recommendation for resolving the 3-4 squawk.

Have you scanned for any stored DTCs? It seems possible that with your symptoms you might have at least one code related to your 3-4 shift, such as P0783, P0733/P0734, etc.

One cause of harsh shifts is a problem with the ECM torque signal, which originates with the MAFS. The manual recommends inspecting the air intake for any leaks or loose fittings between the MAFS and throttle. The troubleshooting manual also recommends performing a hard reset of the ECM adaptations by disconnecting the battery negative cable, waiting 10 minutes, then touching the negative cable to the positive cable (only the engine adaptations are cleared, not the transmission ones).

Hopefully, if nothing else helps, clearing the transmission adaptations and reflashing the TCM/Mechatronic will. If not, you may have an internal problem with a solenoid, pressure regulator or clutch pack.

Cheers,

Don

 

Don,
You give great advice as usual. that troubleshooting guide has great information. I will be doing some more research and will try and get this XP laptop up and running with the V131.03 software.
I am fairly certain my transmission or ECM have never been updated, reflashed or adaptations cleared. This car was lightly driven (2700 miles/yr) for 11 years!

I appreciate everyone's input on this matter. I will solve this issue!

 

The sticky on the x350 face page has all the info you'll likely need on the transmission:

https://www.jaguarforums.com/forum/x...ooting-191572/

 

Sean,
Ive read that link before, it scares me a bit since it jumps right to faulty solenoids/hardware.

If I cant resolve this with an adaptation clear/ reflash and additive then I will consider this after.

 

Thanks and understood. I was only pointing to it because of the many attachments, not necessarily the topic. Hopefully a refresh will solve your woes.

 

Minor update,

I dug out my old XP laptop and installed SDD v131.03 on it. Apart from the computer being a pile of sh*t the software seems to work ok, apart from it being very slow. I see there is both an ECM and TCM update available, so thats good. I will be doing that shortly.

I had a small issue where the Air suspension fault came on after I unplugged the SDD for some reason. I ran the customer configuration script for the air suspension and voila its gone.

I also cleared all the DTC's, there were a boatload on there. Its a shame the dates/miles are not logged on them. The car has ran flawless since ive owned it, so it's strange seeing a list of DTC's

I was trying to locate the 'Clear Transmission Adaptations' but couldnt seem to locate it anywhere..

 

A long list of DTCs is common - any low battery event or longer-than-usual start will trigger a bunch, and they tend to accumulate over time. Write them all down for reference, then clear them and see which ones come back.

I can't remember exactly how to get to the Clear Transmission Adaptations option, but I think you may find it if you start a Diagnostic session and enter transmission-related symptoms (rough gearshifts). When it does its thing and you have the option, click the Recommendations tab and scroll down: you may now see Clear TCM Adaptations in the list.

Just for safety, connect the best battery charger you have before clearing the adaptations. I don't think clearing adaptations is as voltage-sensitive as reflashing a module.

If your v131.03 installation came with the extra disc of calibration files and you decide to reflash the TCM, you must use a stable power supply connected to the battery to maintain stable system voltage. Jaguar specifies a 55 amp, highly-regulated, low ripple charger/maintainer from Midtronics (PSC-550S). I'm attaching the TSB and the Midtronics brochure so you can see the specs. Also, there have been reports of owners bricking modules using Mongoose clone cables, so consider your equipement before deciding to attempt a reflash.

Cheers,

Don

 

Ive been trying to find a suitable power supply that isnt 400$,

So far Ive just used a trickle charger on the 6 amp setting, and havent had any strange issues thus far. I worked on the car for about 45 mins, I reconfigured my instrument panel (it recommended i do so?) and checked various diagnostics, and there was no issue

I found a manual 10amp battery charger, which I think should supply enough amps while the the system is updating.

How long does reflashing take? I'm curious to know what others have used for a power supply..

 

Reportedly, with a Mongoose clone the reflashing can take from 45 minutes to more than two hours. With my genuine Drew Technologies Mongoose, clearing the adaptations took a matter of seconds, and reflashing the TCM took maybe 20 minutes.

I initially bought a 50-amp computer switching power supply off of eBay to use as my power source, but I then noticed that Midtronics PSC-550S units show up on eBay fairly regularly, and if you pay attention, you can pick one up for around $100, so that's what I did.

Cheers,

Don

 

I admittedly have a clone mongoose However I am using the genuine Drewtech driver's with it and have had zero issues communicating so far. It takes a while to read the cars DTC's (about 10mins or so) I assume thats normal?

I had one scenario where I was reading the cars various control modules, and the IE web page just went blank, but the SDD was still responsive. No errors came up and I simply switched to another screen, Clicking OK when the warning message came up.

Im making sure the computer im using is stable and will not have any issues. I am reinstalling TinyXP on it, and buying a new battery for it so it doesnt lose power.

I bought a Schumacher SE-1250 MANUAL 10 amp charger, as this will provide steady 10 amps while im hooked up. I will verify the voltage stability once I hook it up and the key on Ign II

 

Glitches with SDD are common. It's a hog of a program, basically a huge database of html web-style pages, if I understand correctly, so its resource-intensive nature combined with the RAM limitations of XP Pro is a recipe for slowness.

Regarding your laptop, you really should run it with the power supply connected while doing any reflashing.

I also forgot to mention that if you clear the TCM adaptations, the transmission will behave strangely for awhile as it learns new adaptations. Reflashing the TCM will generally smooth things out, but the TCM will still need to learn new adaptations before it operates optimally (assuming you don't have any internal issues).

Cheers,

Don