Bentley Continental GT No Start

[scoper]

Looking at the range of faults I think this is the relevant bit of wiring here

https://imgur.com/a/kwe5G4e

That relay being off when it should be on I think would account for the codes, power side switched by the slightly damp KESSY

 

[Dr Sheldon]

https://imgur.com/a/tGQlMoy

 

[Jinxgj]

Hi all,

Good news...KESSY module dry as a bone and no signs of historic water ingress or corrosion.

Thanks Dr Sheldon for the steer...i have checked all those things you have indicated and all powers/grounds are fine.

The car started again today with no issues at all and all the warning lights are out - didn't scan it because my laptop was flat and the car is at my parents and i didnt have the cable (Organised eh!!).

The passenger carpet is drying, in fact almost dry.

I have also had a look at the possible routes for water ingress. The drains are clear in the scuttles BUT...and i think this might the issue - the car has been parked on my parents driveway which slopes quite aggresively. The car was parked with perpendiculr to the slope with the passenger side downhill of the drivers side. The angle of the slope is greater than the angle of the scuttles into the drains - so when the car gets rained on or washed or whatever, the water drains away mostly but some remains behind under the engine fusebox and in the area of the engine ecus. I think that somehow the water is tracking along the wiring or through the fusebox mounting to the body and entering the car here.

So - perhaps parking it this way has caused the effect of a blocked drain when there isn't one. I have turned the car around today so the drivers' side is now downhill of the passenger because the drivers' scuttle has a big hole in it for the washer fluid so any water left after the drain has done its job will be minimal and the majority will go down the hole where the filler neck for the washer fluid is.

If the car stays dry inside with it parked this way (an experiement to do next weekend with a hose pipe) then this is probably the problem. If so you have to hand it to VW/AUDI/Bentley for designing a car you cant park on a slope without it leaking! - i reserve judgement though.

All in all i might have got away with it and the issue has been resolved without the need for drastic action....a lot of dehumidifier time in the car to come next week to ensure everything is 100% dry after the hose test then a lot of ozone treatment to get the smell of damp carpet out of the car and we should be good again and remove driver seat and carpet to make sure that is dry under there.

Will come back next week and let you all know of any more progress or new issues.

Thanks all

Gaz

 

[TTT]

All the Short to ground fault codes actually mean sensors get no supply. Because ecm relay does not provide any. Futile to troubleshoot sensors.
Anyone which follows South Main Auto and can hold a test light in hand, can troubleshoot this vehicle in 15 min. or about so.

 

[Jinxgj]

Looking at the range of faults I think this is the relevant bit of wiring here

https://imgur.com/a/kwe5G4e

That relay being off when it should be on I think would account for the codes, power side switched by the slightly damp KESSY

Hi Scoper

I have checked that circuit and all is well there now. Not sure about last week when it wouldnt start but now it is OK.

Many thanks

Gaz

 

[Jinxgj]

If you are going to fix this with any efficiency then Attention to Detail will help you progress !!








Take a look !! They are nearly all different faults. Also that gives you an idea what each ECU is controlling !!

Rule of thumb is that

ECU 1 looks after every component that is shared by Bank & 2. Then Every component that is unique to Bank One

ECU 2 does every thing that is unique to bank 2 not much else.




This was a quick exercise (maybe the odd mistake in there)

Clearly they are NOT the same faults in both.

Surely you are of an age where you have your own colouring pencils ??

Sorry...perhaps i didn't adequately phrase the question.

What i should have said is they look the same but relate to different cyl numbers in a lot of cases and what i was getting at was whether the 2 ecus are the same and they detect which bank they have been plugged in to and work out for themselves which parameteres they should be monitoring/controlling without the need for specific programming to a particular bank.

Of course - i asked that question with an almost certain view of the answer is no...they are not interchangeable - but if you dont ask you never know, and if i dont ask someone else who comes along later might be thinking the same thing. Thanks for confirming that they are not interchangeable.

Feel free to ignore this question everyone but i will ask anyway....would it be even feasible for a scenario like the one i describe where a vehicle with 2 ecus for engine have the same software and they work out for themselves which bank they are connected too? Purely a theoretical question...and does anyone know of any applications that do this? Seems to me like it could be possible with a single pin in the ecu being on or off to tell the ecu if it connected to bank 1 or 2.

Gaz

 

[Jinxgj]

All the Short to ground fault codes actually mean sensors get no supply. Because ecm relay does not provide any. Futile to troubleshoot sensors.
Anyone which follows South Main Auto and can hold a test light in hand, can troubleshoot this vehicle in 15 min. or about so.

Yes - thats exactly what i have done - powers and grounds all check out.

Good old Eric -O!!!

Gaz

 

[Dr Sheldon]

i describe where a vehicle with 2 ecus for engine have the same software and they work out for themselves which bank they are connected too?

Nope !!

Each one is programmed to its habitat.

Hot-Swapping is not possible.


Either way it seems that you are looking to solve problems you dont have !!

All the Short to ground fault codes actually mean sensors get no supply. Because ecm relay does not provide any. Futile to troubleshoot sensors.
Anyone which follows South Main Auto and can hold a test light in hand, can troubleshoot this vehicle in 15 min. or about so.

Read that from TTT again !!

I am also thinking you are out of your depth here !!

You have all but been breast fed the solution here yet you digress and waffle !!

 

[Uwe]

Each one is programmed to its habitat.

I'm not convinced of that. They both appear to have the exact same software in 'em.

That said, I don't have the sense that the problem here is with the ECUs.

-Uwe-

 

[Dr Sheldon]

I'm not convinced of that. They both appear to have the exact same software in 'em.

That said, I don't have the sense that the problem here is with the ECUs.

-Uwe-

Makes Sense however one is designated 01 and the other 11 ?

I was under the impression that 01 is the Master and 11 the Slave.


I would be both pleasantly surprised and equally horrified if you could just swap them over ?

 

[Uwe]

I would be both pleasantly surprised and equally horrified if you could just swap them over ?

I don't remember what the exact deal is with dual ECU setups of that vintage. One possibility is that the have a "Coding Input" -- basically a wire from the harness that connected to ground on the one ECU and to +12 (or allowed to float, using an internal pull-up resistor) on the other, and the ECUs determine whether they are 01 or 11 based on the state of that input. Of course there are other ways to go about this sort of thing as well.

At one point we had a pair of Phaeton W12 ECUs in our lab. @Eric might remember more details of how this works than I do.

-Uwe-

 

[Jinxgj]

I am also thinking you are out of your depth here !!

You have all but been breast fed the solution here yet you digress and waffle !!

Firstly - you dont know me so dont presume to know what my depth is - i dont presume to know who you are or what your depth of knowledge might be but i do thank you for any help you choose to post.
Secondly - if you are going to try to offend me at least use the correct terms - the correct term is spoon fed a solution - not breast fed. Thanks for making me think of breasts though - a welcome break in an otherwise dull day.



On the ECU's - yes a problem i seem not to have but an interesting question i thought - and i happened to stumble upon this thread today in a Bentley forum which may jog Uwe's memory:


https://www.6speedonline.com/forums/bentley/399158-bentley-continental-master-slave-ecu.html

I dont pretend to understand all of that (eeprom programming is out of my depth and happy to admit it) - but from what i can work out it looks like it might be possible to swap them as long as KESSY is programmed to the correct ECM.

I think this thread may have run its course (for me at least) and i sincerely thank you all for you assitance in troubleshooting the problem which ultimately seems to have been caused by water under the passenger carpet but it is difficult to determine this 100% because the car started working by itself after some drying and all the tests highlighted above are all good now.

To be honest - it looks like i may have dodged a potentially expensive bullet when all said and done.

Thanks all

Gaz

 

[Uwe]

i happened to stumble upon this thread today in a Bentley forum which may jog Uwe's memory:
https://www.6speedonline.com/forums/bentley/399158-bentley-continental-master-slave-ecu.html

The hardware and software will be the same for each unit with the determination of type being made in software via the coding of Pin 49 - 12V master or 0 V slave.

Yep, there ya go.

-Uwe-