sierrafery said:

Hi, you should check the fault code first with dedicated scantool not change the ECU just like that...what if it's a sensor or wiring issue? Based on the code you have the steps described in the attachment

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lynall said:

Brake light switch
Brake light bulbs

Level sensors and their wiring

Not all faults give codes, and not all codes mean there is an actual fault!

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Hugy said:

Every so often while driving my Discovery 3 2009 a brake fault occurred and the suspension lowered. To clear this I had to switch the engine off and start it again then it would be ok for a week or so then happen out the blue again.

I have had an absolute nightmare trying to resolve the fault replacing valve blocks and compressor as well as checking for leaks.

I am now at a stage of replacing the Discovery 3 Air Suspension ECU Module Land Rover RQT500170 2004 to 2009. I believe this is located and accessed by removing the battery and tray a walk through would be welcomed if anyone has it?

If this doesn't work I am at a total loss as its beyond my capabilities now on where next to look.

let me know your thoughts please guys and if any of you have come across this problem.

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sierrafery said:

Wiring to where? cos it's a huge variety of wires and connectors in that vehicle... do you have an ECU related fault code which made you suspect it?

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lynall said:

Brake light switch
Brake light bulbs

Level sensors and their wiring

Not all faults give codes, and not all codes mean there is an actual fault!

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biketeacherdave said:

Off side rear lever sensor wiring, common fault repair kits on the bay. Corrosion in the loom sensor end.
Could be others not likley ecu

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Nodge68 said:

As above.


You've said it happens when you brake, so there's the breadcrumb trail, and the above advice is where to start looking.

It's unlikely to be the EAS module, or the valve blocks.
The EAS module needs to be configured to the vehicle anyway, so unless you have advanced diagnostic equipment to do that, it's not a goer.

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Hugy said:

Hi, no it happens when mainly when reversing or in slow moving traffic on an incline.

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Hugy said:

Ok guys I have a fault code U0416-86 and looking at the PDF attached at the top it says under that code check ABS system and DTC's.
Whats DTC's stand for and has anyone got a workshop manual on file i can refer to?

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lynall said:

I think u codes are info only.
So I would say you need access to a better code reader, as it should be able to read abs system on its own.

DTC is trouble code, I have it in my head as digital trouble code!

If you are keeping the car you really need a code reader, dirt cheap ones only read engine codes, better ones read every system, Iirc the D3 has something like 20 ecus.
IID by Gap is the best, but also the most expensive, excellent resale value so may seem dear but cost of ownership will be the same as a cheaper one.
Icarsoft reads all the same systems as the IID but it cannot programme like the IID, which is not the big issue some people like to make out it is, Icarsoft is also 1/4 the price of the IID.

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Hugy said:

I ll have to get it sorted at a garage at a massive cost no doubt........nightmare!!

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Hugy said:

I ll have to get it sorted at a garage at a massive cost no doubt........nightmare!!

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