SO, I do get the TC light on occasionally but I also got stuck trying to get up an obstacle while off-road. It was the first time trying this obstacle in particular but i was expecting it to make it up without issues with tc. Also noticed that when I try to switch on the hill decent I get a continuous alarm, so pretty sure there is something wrong with the TC. 3 amigos switch on and off normally on ignition. Any ideas?? I do have a nanocom and did not get any fault codes
Disco 2 TC not working well
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sierrafery
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Read the owner's handbook for driving techniques, the TC works well only if you know how to work with the throttle . HDC has nothing to do with TC, was it in low when you tried HDC?... if not my first advice was just, if yes check the hi-low input with nanocom
Yes i was in low range. And i am aware on how to use tc, ie keep constant throttle and persist a bit until tc does its thing. I also had cdl and the light was on so that should be ok. Checking the low high switch is a good tip! Thanks will check that next
sierrafery
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Corroborating these two statements
So did you have the CDL on and the TC light came on as well? what year is your D2 ?
sierrafery
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Was it factory fitted with CDL and it has the original SLABS ECU ?
sierrafery
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So you have your answer why the TC doesnt work well... that's why i inisted with questions cos as long as it's a facelift as it left the factory there's no reason for the TC to not work well as long as it's correctly driven. You mixed up the whole management by introducing a different gearing. In a nutshell: the ABS system is sensitive and was mapped and calibrated from factory for all it's standard fitments including tyres, once you modify something the whole management is mixed up(engine included) and it will not work as it was conceived to.
That might be the case but im not convinced. Not sure if you can see this video, it shows tc and cdl working pretty well together. https://photos.app.goo.gl/urTNi98UBozk8Zm1A
sierrafery
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I didnt comment to how they work or not together, my replies were to your topic named "TC not working well" and i explained what can be the reason.
ok, i understand. also agree that the difference in gearing and wheel size may have had an effect on the performance but considering it is not a sophisticated system, i doubt it would be noticeable. Also may have not outlined it but the issue i am trying to solve is that i think there was a drop in the tc performance which I cannot explain or relate to something i did. Also the HDC is closely related to TC (it is basically TC without waiting for user input, ie throttle). Btw, in another post I was reading that a particular SLABs ecu edition is superior to other, and I had actually obtained such a slabs ecu but never got around to changing it. When I took a look I thought it was quite challenging to replace as I think i could not get to some of the bolts. is it easier than it looks?
sierrafery
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OK, no offence please but i have serious doubts that you really understand how the ABS system works if you think it's not sophisticated(cos it is) and if you say "Also the HDC is closely related to TC (it is basically TC without waiting for user input, ie throttle). The TC acts if there is difference between wheel speed sensor inputs from each wheel acting on the spinning wheel while the HDC acts on both wheels of the leading axle(or on all) at the same time while the vehicle's speed is increasing based on VSS and a mapped target speed, completely different principles and operation mode. Better read the operation mode from the WSM
None taken my friend i m not an expert and what i know i gathered here and there. I thought the hdc worked in principle same as tc, for example if I am going down a hill with low range to control speed, if I were to be in a wheel in the air situation, hdc would detect that as the wheel starts spinning and applies brake so that the load goes on another wheel rather than going down in affectively "free" until all four wheels are on the ground again. Anyway, what is the WSM?
sierrafery
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Yes, see in RAVE- Workshop manual - Brakes - Operation, you'll see that it's quite sophisticated 
I have changed on mine when installed CDL. Quite tricky to reach all bolts but manageable. Used mirror or sometimes just undo bolts blind.
would be much easier after removal of front left seat.
sierrafery
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Another evidence that the whole thing is more sophisticated than it appears ... go in Td5 engine - inputs switch and watch `"transfer ratio", and be aware that the reports are reverted, as long as the inputs are changing when you select hi - low it's ok even if you think it's not , if no change then you have a problem
... go in Td5 engine - inputs switch and watch `"transfer ratio", and be aware that the reports are reverted, as long as the inputs are changing when you select hi - low it's ok even if you think it's not , if no change then you have a problemGreat, thanks. It is stuck in HIGH value, so i now know i have a problem there. Will check wiring and maybe i will need a new switch. Im surprised it is stuck in High, which i think means it thinks it is in Low range? In which case hdc should work. Is there a possibility the low = high, high = low was eventually fixed, since i have a relatively recent nanocom
