Thread: Need definitive answer on tight tolerance mode

After waiting far long to see if I could get to the dealer's to have TTM set for an alignment (the 2 left tyres were scrubbed-out), I had it done locally without TTM set but at a specialist workshop and with the main suspension fuse pulled once the vehicle had levelled on the platform and was without any occupants so that it couldn't re-level downwards mid-session. Whilst the geometry was within LR specs, left and right front cambers were at opposite ends of the specs and rear toe was a long way from the optimum setting. As the tyres were effectively worn-out and I have just fitted new tyres, I cannot yet say whether the alignment was succesful or not. However soon after the alignment was done I realised that the vehicle now steered consistently around bends where it felt awkward beforehand, so I recommend not waiting for TTM if waiting is going to destroy tyres.

Hmmmmmm - please explain - what is Tight Tolerance Mode??? Is this just a D4 thing or does it also apply to D3 etc

Garry

In TT mode the suspension ecu allows less leeway between the target height and the actual height for each wheel, ie its more fussy about getting to the correct heights.

Originally Posted by Graeme

In TT mode the suspension ecu allows less leeway between the target height and the actual height for each wheel, ie its more fussy about getting to the correct heights.

For what purpose??? Wheel alignment

Thanks Graeme for your answers so far.

Garry, yes, it refers to wheel alignment.

As Graeme mentioned, if you don't have the facility to engage TT mode, the key is to let the car level itself on a flat surface (stationary with the engine running for around 10 min should do it), and the switch off and pull the fuses for the EAS. You can use this method to do the alignment at any height - ie if for some reason you need to run the car constantly at off road height, you can set it at off road and follow this procedure to set the alignment for this height. Of course then it will be out for on road height. This applies to all EAS cars,
Cheers,

Gordon

I put Pirelli ATRs on 25,000 km ago and had wheel align done ,in on road height at Bob Jane. Tyres are wearing even, no problems ,maybe just lucky.


Cheers Ken

Originally Posted by gghaggis

the key is to let the car level itself on a flat surface (stationary with the engine running for around 10 min should do it), and the switch off and pull the fuses for the EAS.

Gordon

Another example of making things more difficult than it needs to be.