Join Date: Jul 2016
Location: Melbourne, Australia
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I reckon the problem is multilayered- I am now on my 7th, yes 7th fix for the Disco with respect to stop/start- unlike others, my car was not one of those that had issues with the gateway module, apparently my charging system works fine and battery is good...
I have read every parameter that activates or deactivates the stop/start and have applied as a constant across the last 15,000km. I have logged every trip, what features are on, what are off, what the ambient temp is at the start of a journey what it is at the end of a journey, how many times stop/start actually worked, how many times it partially worked and how many times the car stops after the engine temperature has passed the "blue" notch- I measure my battery voltage every morning before I take off and when I come back at the end of the day. At the 8000km mark I turned all features off and logged 4000km of data-
Basically in my car- there is no set pattern to when the system works or doesn't. It doesn't matter whether I am running systems within the parameters mentioned in the hand book or no systems at all- There is no pattern to its operation....I have has instances where I have been stopped at the lights for over 1minute, the car is still running, then suddenly stop/start activates..
I have been driven to log 15000km of data because I am tired of how JLR have dealt with this and many many other issues with my car...
I am certain that the computer in my car is F#@$ED. My fuel efficiency is out of whack too- According to the computer the car will return an average of 10Lt/100km with a 90% driving style across a journey in the city where the car has stopped 4 times in a 30km journey and travelling at an average speed of 52kms/Hr, YET the fuel poured into the car week to week is the same as it was 1 year ago (I drive the same roads on this data logging process at the same times of the day) when the computer would display 8.2 - 8.5Lt/100km on the same journey with the same amount of stops with a similar average speed and a lower driving style. So it shouldn't actually be less efficient if Im using the same fuel for the same distance travelled!
Further, the car will maintain set cruise control speed on straight flat roads and incline roads- but will fail to hold speed on slight downhill roads- you can feel the computer applying the brake a couple of times and then gives up so the car rolls and before you know it you are doing 100km/hour on a 70km/hr road.
My theory is that the stop/start has nothing to do with the battery system (at least in my case), I believe that the drive by wire is off either because the computer is driving it wrong OR the drive by wire is sensing the wrong inputs..
In two weeks time- I have a meeting with the GM of the JLR dealer I take my car- I have warned them of the data I have collected and the manner in which I collected it, so that it does not come to them as a shock!
Basically, the car will get handed back to them and I don't want it back until everything is fixed- I don't care if they have to replace all systems including computer and re-flash my car...The experience has not been pleasant...