countrywide
Member Since: 16 Sep 2007
Location: UK
Posts: 6019
  
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I got into the car at work during the week and as I put the car into drive a message popped up "auto transmission fault". Nothing else apart from a "bong", a second or so later it disappeared (I didn't turn the car off and on again either).The car was fine and I haven't had it since.
Is this just a random warning due to some sensor picking something up. I have probably driven 100 miles since and no more warnings.
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 24th Nov 2007 5:50 pm |
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DiscoStu
Member Since: 09 Apr 2006
Location: London
Posts: 11412
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At this time of year low battery voltage throws up a lot of faults - especially 1st thing in the morning if it's cold Disco 5 HSE Lux
https://www.youtube.com/watch?v=peyiqaJrmMU
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| 24th Nov 2007 5:51 pm |
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countrywide
Member Since: 16 Sep 2007
Location: UK
Posts: 6019
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DiscoStu wrote:At this time of year low battery voltage throws up a lot of faults - especially 1st thing in the morning if it's cold
Thanks for the tip. It was -3 when it happened and the car had been sat at work all day. I also had the lights, heated seats, heated screen front & rear on and the FBH was in the middle of firing up so the battery was under a lot of load.
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| 24th Nov 2007 5:54 pm |
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DiscoStu
Member Since: 09 Apr 2006
Location: London
Posts: 11412
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I get it on mine (a manual) after driving short journeys in cold weather. 'Transmission fault - Traction Reduced' or similar. Disco 5 HSE Lux
https://www.youtube.com/watch?v=peyiqaJrmMU
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| 24th Nov 2007 5:57 pm |
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Jamo
Member Since: 18 Jan 2006
Location: Esperance, Western Australia
Posts: 1170
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Yeah, that's the first low battery warning.
the next one is 'HDC unavailable'.
I've never actually seen the 'low battery' warning come up though. Have a nice day!
2010 Cayenne Diesel with PASM & Off Road Pkg
2005 HSE D3 (Sold)
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| 26th Nov 2007 12:59 pm |
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10forcash
Member Since: 09 Jun 2005
Location: Ubique
Posts: 16534
 
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It takes about 7 - 9 miles of driving ( i.e. engine revs above 1500rpm) to put back the charge taken out by starting the vehicle, obviously lots of short journeys will have a cumulative discharge effect on the battery, once a lead-calcium battery (as fitted on the Disco3) is below 60~70% charge, only a proper bench charger will recover the battery efficiently
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| 26th Nov 2007 1:06 pm |
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RichardK
Member Since: 18 Jan 2006
Location: Western Australia
Posts: 295
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When I had the problem with the loose earth connection and the battery was constantly low I would get a "Low Battery Voltage" message on the radio screen, haven't had it since the earth was fixed
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| 26th Nov 2007 1:06 pm |
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Mossy
Member Since: 01 Jul 2005
Location: Hollyoaks, UK
Posts: 2682
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10forcash wrote:It takes about 7 - 9 miles of driving ( i.e. engine revs above 1500rpm)
Ian, is that true for the Petrol? I sometimes wonder if mine gets much of a charge on the two-and-from work journey.
10forcash wrote:once a lead-calcium battery (as fitted on the Disco3) is below 60~70% charge, only a proper bench charger will recover the battery efficiently
Isnt that just a bit silly in a car then, especially in a power hungry mota like the D3 where there's plenty electrical going on. D3 HSE V8...
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| 26th Nov 2007 1:11 pm |
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countrywide
Member Since: 16 Sep 2007
Location: UK
Posts: 6019
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Mossy wrote:10forcash wrote:It takes about 7 - 9 miles of driving ( i.e. engine revs above 1500rpm)
Ian, is that true for the Petrol? I sometimes wonder if mine gets much of a charge on the two-and-from work journey.
10forcash wrote:once a lead-calcium battery (as fitted on the Disco3) is below 60~70% charge, only a proper bench charger will recover the battery efficiently
Isnt that just a bit silly in a car then, especially in a power hungry mota like the D3 where there's plenty electrical going on.
You can get different batteries, which can accept a higher discharge, but they cost more. We had leisure batteries on our boat which you could discharge further. I tried a car battery and killed it by discharging it too much running cabin lights etc. I think the OPTIMA batteries are meant to be good.
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| 26th Nov 2007 1:22 pm |
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10forcash
Member Since: 09 Jun 2005
Location: Ubique
Posts: 16534
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Mossy, yes it's broadly the same - although the petrol has a lower compression ratio and therefore less EMF is required to turn the engine,the alternator is 'only' an 80A output whereas the diesel has a 150A unit. once the vehicle is running, all the systems draw current from the alternator so provided it's not left at idle with heated-everything, lights, etc. for a long time (maximum alternator output is only avaiable above 1500rpm) thn there should be no detremental effect upon the battery. The CJB and ATCU have software strategies to minimise current draw whilst the vehicle is not running or bus voltage is dropping, the only problem is that these can be overidden by human intervention 
I can only assume that lead-calcium batteries were chosen for their low-temperature performance, the stupid battery terminal clamps don't help either 
Counrtywide - Yep, Optma's are compatible with the D3 and the only one's I fit
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| 26th Nov 2007 1:35 pm |
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Mossy
Member Since: 01 Jul 2005
Location: Hollyoaks, UK
Posts: 2682
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Cheers 
10forcash wrote: the only problem is that these can be overidden by human intervention
Yes, I discovered this once all by myself  D3 HSE V8...
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| 26th Nov 2007 1:38 pm |
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simonsi
Member Since: 14 Oct 2007
Location: Auckland
Posts: 1264
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Is "Low Power Mode" flashing up on the stereo panel when turning the engine off an indication of battery state/problems or something else or (sounding hopeful), nothing??  Cheers
Simon
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| 26th Nov 2007 2:15 pm |
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10forcash
Member Since: 09 Jun 2005
Location: Ubique
Posts: 16534
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Low power mode is simply the audio system recognising that the engine isn't running and conserving battery power by limiting the maximum output, dependent upon the state of battery charge (and audio volume), you may see this as soon as the engine is turned off or at some point later. The centre cool box has a similar power save strategy
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| 26th Nov 2007 2:49 pm |
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10forcash
Member Since: 09 Jun 2005
Location: Ubique
Posts: 16534
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Twice...
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| 26th Nov 2007 2:50 pm |
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Gareth
Site Moderator
Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26699
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Iain, are you saying you are replacing the vehicle battery with an Optima, or just using them for Aux battery installs?
I'm thinking of the next couple of years when the early D3's start failing their batteries out of warranty, and replacements need to be sought, not necessarilly from Land Rover who will probably charge a kings ransom for a new 'Genuine Parts' battery.
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| 26th Nov 2007 5:21 pm |
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