Thread: Discovery 2 TC

Ill Try to buy 60 teeth hubs and replace it again

I've also had this issue once before. However the hub wasn't replaced, i had just fitted a long sensor from the hub all the way to the ECU. I always solder the new sensor wires due to the fact it is easier for me than disassembling the plug and fitting new pins under the dash...
The problem in this case which took me a while to trace the fault was that even with both wires insulated and seperated there was a sharp spike of solder pushing through one insulated connection and intermittently contacting the other wire through its insulation. The spike was needle sharp and I'm not sure how I managed not to cut myself on it while taping it up.

Basically the signal from the wheel sensor was telling the ecu a wheel was locking. No fault codes as it was doing its thing fine😮😕

Jc

Hope you got is sorted Yakuza.

After reading all the posts on this site that I can on this and similar issues, I am still puzzled.
I have had the TC operate for seemingly no reason also.
However I read that individual wheels should only be braked by TC when under 50 km/h and 50-100 km/h only front / rear wheel pairs should be TC braked.
Not the source I read, but close: "This system will operate fully up to a speed of 50 km/h (31.25 mph) and some functions are active up to speeds of 100 km/h (62.5 mph)."
I have experienced TC braking (TC light indicating operation) at about 80 km/h recently.
No recent hub/sensor changes.

This made me think the SLABS unit was at fault. Why else would this happen unless multiple sensors / signals are giving the wrong speed to the SLABS and a faster speed to the speedo?
OK maybe one sensor momentarily give zero speed and the average falls below 50 km/h for TC to operate and the speedo is slow to react - but that sounds a bit unlikely??
Anyway I pulled the ABS fuse and drove home. (as a side comment, driving home the HDC green light was on also but occasionally this would go out and the speedo would go to zero at the same time. At the time I took this to confirm the SLABS as being the problem.)
I went to a local land rover 'expert', who had not seen this problem before.
I have also talked to M R Automotive who say they have not sold a SLABS since 2011. So if it was the SLABS then it would be unusual.
Anyway the local mechanic did the usual checks - no faults found other than from pulling the fuse, no bad sensors. He then swapped the SLABS with another he had.
My SLABS was an SRD000070 (original I believe) and the mechanic installed one is SRD000170.
His test drive confirmed that TC was still kicking in (not sure of speed)
So I have now pulled the ABS relay so my wife who normally drives the D2 to work, doesn't end up TC swerved across the centre line.
This relay out gives the three amigos plus the brake warning light, which is also not a long term solution.

So at this stage I am just going to have to go through all the other fixes that I have seen on this site:
try to invoke the problem a few more times to check scenario, tyre pressures, suspension balance, Sensor fitment, sensor cable integrity, hub reluctor tooth count, ......

Any thoughts??

"some functions work up to 100kph"

thats nice,, I'd expect the "other" half of Traction Control (ABS) to work at any speed--- its all the same sensors.

in fact,, at road speeds it would be the ABS doing the hard yards,, ( modulator still felt through floor) though an unintended wheel "lockup" would be dramatic!

Hmmm...

Yeah i have got it sorted, since that fix never had that TC issue since,

Rang the person up in the UK and sent it back for an refund and correct hub, All good

Originally Posted by LyleC

Hope you got is sorted Yakuza.

After reading all the posts on this site that I can on this and similar issues, I am still puzzled.
I have had the TC operate for seemingly no reason also.
However I read that individual wheels should only be braked by TC when under 50 km/h and 50-100 km/h only front / rear wheel pairs should be TC braked.
Not the source I read, but close: "This system will operate fully up to a speed of 50 km/h (31.25 mph) and some functions are active up to speeds of 100 km/h (62.5 mph)."
I have experienced TC braking (TC light indicating operation) at about 80 km/h recently.
No recent hub/sensor changes.

This made me think the SLABS unit was at fault. Why else would this happen unless multiple sensors / signals are giving the wrong speed to the SLABS and a faster speed to the speedo?
OK maybe one sensor momentarily give zero speed and the average falls below 50 km/h for TC to operate and the speedo is slow to react - but that sounds a bit unlikely??
Anyway I pulled the ABS fuse and drove home. (as a side comment, driving home the HDC green light was on also but occasionally this would go out and the speedo would go to zero at the same time. At the time I took this to confirm the SLABS as being the problem.)
I went to a local land rover 'expert', who had not seen this problem before.
I have also talked to M R Automotive who say they have not sold a SLABS since 2011. So if it was the SLABS then it would be unusual.
Anyway the local mechanic did the usual checks - no faults found other than from pulling the fuse, no bad sensors. He then swapped the SLABS with another he had.
My SLABS was an SRD000070 (original I believe) and the mechanic installed one is SRD000170.
His test drive confirmed that TC was still kicking in (not sure of speed)
So I have now pulled the ABS relay so my wife who normally drives the D2 to work, doesn't end up TC swerved across the centre line.
This relay out gives the three amigos plus the brake warning light, which is also not a long term solution.

So at this stage I am just going to have to go through all the other fixes that I have seen on this site:
try to invoke the problem a few more times to check scenario, tyre pressures, suspension balance, Sensor fitment, sensor cable integrity, hub reluctor tooth count, ......

Any thoughts??

Update:
With ABS relay refitted: no lights but sometimes three chimes at start-up, which the manual tells me is ABS warning.
With my Nanocom connected, only fault found was from removing ABS relay. This cleared and no faults remain, but chimes still sound at start-up sometimes.
Checked tyres, suspension sitting evenly, Nanocom gave normal standing reading for sensors. Attempted to cause TC operation by dropping front R tyre pressure and driving in circles full left turn (to get front R tyre tuning faster than average speed), but this obviously didn't deviate enough to get TC working.
So drove up one of two ramps I have. Ramp is about wheel base length and rises to about 1 metre high. This gets the disco cross axled and spinning wheels. TC light comes on (but didn't really seem to do much).
Doing this I also proved TC operation with diff lock and without, so the SRD000170 SLABS must be from a D2A? Mine is a 2000 model.
I still need to do a straight ahead check of wheel speeds all matching - just to prove all reluctor rings are the same.

I would say the the replacement SLABS module did the trick, except am getting ABS three warning chimes at start-up inconsistently but no faults on nanocom.

Any more thoughts??
Cheers,
Lyle

Originally Posted by LyleC

.....
I would say the the replacement SLABS module did the trick, except am getting ABS three warning chimes at start-up inconsistently but no faults on nanocom.
....

You'll hear those chimes every time if you wait untill the system self check is completed ... that's how the system tells you it's over, that's the normal behaviour of facelift SLABS ECUs and no worries as long as no warning lights are on

from D2a owner's handbook:

ABS warningIf a fault with the anti-lock braking system is
detected, a warning will chime three times and
the warning light will be illuminated. You may
continue driving, but should understand that
full ABS control may not be available. Consult
your Land Rover Dealer/Authorised Repairer at
the earliest opportunity.

Three warnings may also be heard during
engine start-up as part of the ABS system
self-checks. This is normal unless the ABS
warning light stays illuminated after the engine
is running.

Thanks for the helpful reply sierrafery.

I'll have to try being a little more patient.
That also reminds me reading something about some checks are only performed if the vehicle goes above X km/h during the previous ignition cycle.
Must go find that detail again.
Cheers,