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Run, cut out x 6, then stays off

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longclose

Member Since: 07 Mar 2015
Location: Dorset UK
Posts: 234

2008 Discovery 3 TDV6 HSE Auto Tonga Green

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 >

for this your wallet can take a pounding and you worry about being deflated at any time...
2009 Model D3 HSE

26th Nov 2015 12:00 am

barendjoubert

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

2005 Discovery 3 TDV6 SE Auto Unknown Colour

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...

26th Nov 2015 5:49 pm

longclose

Member Since: 07 Mar 2015
Location: Dorset UK
Posts: 234

Let us know how you get on.. hopefully it will not cost you an arm and a leg...

Owning a Discovery 3 is like dating a model.. a firm body and shape, wow.. the ride is fantastic >

for this your wallet can take a pounding and you worry about being deflated at any time...
2009 Model D3 HSE

28th Nov 2015 4:28 pm

narked50

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

Have you managed to fix it yet?

1st Jan 2016 11:36 pm

barendjoubert

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

Yes the car was fixed by reprogramming the ecu, done by a Land Rover dealer.

4th Jan 2016 7:56 pm

narked50

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

Thanks. Will have a try.

5th Jan 2016 9:11 am

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