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Run, cut out x 6, then stays off
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Member Since: 07 Mar 2015
Location: Kloof in the UK winter Dorset in the UK Summer
Posts: 196

South Africa 2008 Discovery 3 TDV6 SE Auto Tonga GreenDiscovery 3

Sorry one of those hot sleepless nights, I have re-read your first post. What I believe is happening from what I can see is the ECU is powering up but the supply is collapsing and the ECU is rebooting every 2 seconds hence the reason that your are getting the trouble codes logged from the supply voltage to the DC/DC this means the internal voltage will be dropping <5V. Capacitors are charging then collapsing as there is not enough current to keep the ECU powered.

As Mikey says the car will crank and start, but the ECU ir rebooting and resynching with the BCU until it fails. Resetting the fuse hard resets a flag that has probably been set internally in the ECU after 6 attempts.

So this is either a supply problem as already highlighted or an internal ECU problem where an internal capacitor has broken down (acts as a reservoir to internal circuitry) this is absolutely symptomatic of either. I still believe it to be supply problem personally as it is extremely rare for automotive electronics to fail but you might be the unlucky one.

Have you got a wiring diagram to check all the supply voltages and earth potentials and relay feeds?
 Owning a Discovery 3 is like dating a model.. a firm body and shape, wow.. the ride is fantastic >Very Happy for this your wallet can take a pounding and you worry about being deflated at any time...
SA - SWAMBO- Discovery 3 08 - SE Tonga Green
SA - Mine - Discovery 3 08 SE - Cairns Blue (Sold as a Taxi in Mozambique)
UK - SWAMBO - Discovery Sport MY17 
 
Post #156751626th Nov 2015 1:00 am
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barendjoubert
 


Member Since: 02 Nov 2015
Location: Pretoria
Posts: 9

South Africa 2005 Discovery 3 TDV6 SE Auto Unknown ColourDiscovery 3

It seems like the bcu is happy with the key and therefore enables the starter, but the ecu to bcu syncronisation is disturbed and therefore the ecu shuts down. The car went to a land rover agent today so lets see what they find...
  
Post #156776926th Nov 2015 6:49 pm
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Member Since: 07 Mar 2015
Location: Kloof in the UK winter Dorset in the UK Summer
Posts: 196

South Africa 2008 Discovery 3 TDV6 SE Auto Tonga GreenDiscovery 3

Let us know how you get on.. hopefully it will not cost you an arm and a leg... Neutral
 Owning a Discovery 3 is like dating a model.. a firm body and shape, wow.. the ride is fantastic >Very Happy for this your wallet can take a pounding and you worry about being deflated at any time...
SA - SWAMBO- Discovery 3 08 - SE Tonga Green
SA - Mine - Discovery 3 08 SE - Cairns Blue (Sold as a Taxi in Mozambique)
UK - SWAMBO - Discovery Sport MY17 
 
Post #156873628th Nov 2015 5:28 pm
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narked50
 


Member Since: 16 Nov 2015
Location: Gloucestershire
Posts: 4

United Kingdom 

Have you managed to fix it yet?
  
Post #15859592nd Jan 2016 12:36 am
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barendjoubert
 


Member Since: 02 Nov 2015
Location: Pretoria
Posts: 9

South Africa 2005 Discovery 3 TDV6 SE Auto Unknown ColourDiscovery 3

Yes the car was fixed by reprogramming the ecu, done by a Land Rover dealer.
  
Post #15873494th Jan 2016 8:56 pm
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narked50
 


Member Since: 16 Nov 2015
Location: Gloucestershire
Posts: 4

United Kingdom 

Thanks. Will have a try.
  
Post #15875755th Jan 2016 10:11 am
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