8 speed shift lock solenoid problems

Hi Scott,

Yes you are correct, unfortunately I didn't have a photo whilst performing the action (I was too busy trying to get home).

There is a narrow raised section on the shift lock that protrudes into the circuit board where there is an optic sensor. Using this raised section you can slide the lock open, it's very easy and light pressure will open it.

If you tie the shift lock open, I originally thought it would create a safety risk by allowing a drive/reverse to be selected without the brake pedal (or a driver for that matter). However when I tested this, the Gearbox will not shift to drive/reverse without a brake pedal signal from the brake switch.

The instruction is really in it's first draft and a little rushed to help Eric, I'll add updates from any feedback or input anyone would like to add.

Cheers
Marc

Well I just spent 2.5 hours following Marc's excellent instructions pulling out the TCS and resoldering joints as he demonstrated.

Soldering these minute joints was really hard...so hard I had to adopt the Trappist Monk trick of reverting to my normal -10 myopia by removing my contacts. Then with a well pointed and powerful soldering iron plus strong light I was able to get them done...eyeballs about 3cm away from the joints 😆

I tested the solonoid in situ and it worked fine with 9v.

I then installed the rip cord as suggested. Put it all back together and Voila. ...it f n works😆😆😆😆😆

I would strongly recommend that all D4 owners with the rotary selector AT LEAST install the rip cord that way you won't get stuck in P or D or R when the solonoid goes open circuit/shorts...and it will eventually.

Why LR don't put in a manual override is beyond me..it can only be described as criminal lazy engineering.

Anyhow...If it keeps working I've saved a shed load of cash thanks to Marc and AULRO.

If not...well at least there's now a back up option until a new unit is installed.

Who hoooooo...take that Tilfords and LR😅

The shift lock mechanism is like a 5 sided open top rectangular box which slides in a square shaped canal moulded into the base plastic housing. Once apart you can clearly see where to drill a hole thru the housing proper and then thru the wall end of the rectangular box which forms the sliding shift lock mechanism. The lock part is on the other end of the 'box'. Only light pressure is required to pull it back thereby disengaging the lock from the selector shaft.

The zip tie method works well but you could use string or fishing line.

If opening to disengage the shift lock..look for a narrow pedastal like black plastic piece which as Marc says goes to the circuit board. Use this protrusion with your screwdriver to ease the lock mechanism back.

I'll try holding the rip cord back whilst changing gears tomorrow and see if it chucks a hissy fit.

Any errors that had to be cleared after having it apart?

Scott

Yes the original one referred to by Marc...*

P176C-11 Transmission range selector lock control error – General electrical Failure – circuit short to ground

..which I think is actually an open circuit.. ..

..Plus another related to gearbox being placed in neutral and drive..missmatch or something. I'll check others again tomorrow and report back as I only cleared the one referred to in the PDF.

Just another aspect...the new TCS module according to LR needs to be configured to the vehicle. However I understand that owners have fitted new and used modules withour doing so and no issues have arisen

I contacted the GAP Team asking if the 11D tool can do this task and the answer was short and sweet ie "yes it can ".

Unfortunately they did not say how😐

Other members more familiar with this tool might know how.

Quote:

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Originally Posted by LRD414

Any errors that had to be cleared after having it apart?

Scott

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Errors after install -

P176C trans range selector lock control error
U201B Control Module Calibration
U0126 Steering Angle Sensor

..Steering angle sensor needs reprogramming viz GAP Tool procedure...wheels straight ahead etc etc.

Others I cleared and unit continues to work okay today.

Quote:

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Originally Posted by INter674

U0126 Steering Angle Sensor
..Steering angle sensor needs reprogramming viz GAP Tool procedure...wheels straight ahead etc etc.

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I think this is just a "lost comms" error (starts with a 'U')
It shouldn't need to be recalibrated if you only had TCS apart?
That's assuming steering angle sensor was not actually disturbed.

Regards,
Scott

Hi Scott,

From what I understand Eric already had an error with the steering angle sensor U0126 prior to any gear selector issues, from what I'm reading the second fault U201B "Control Module Calibration" relates to steering angle sensor calibration in the BCM computer.
I suspect the steering angle sensor has been replaced at some point but not calibrated, or the steering angle sensor has a fault invalidating the calibration data? But that is just my guess.

With my D4 I haven't had any fault codes since the repair.

Cheers
Marc

Correct..the error has been there for some time b 4 the TCS issue arose.

All fixed now with a recalibration this am and the rotary gear selector is still working okay with a drive back to the place where it failed last week. No problems this time☺