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gbrownings

ECU failure - advice please

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Bit of a saga really which started with the ABS DCS and assorted orange lights coming on. Initial check came up as failed ABS front wheel sensor failure. Replaced but lights came back. Was recommended an experienced electronics person who did various tests but concluded that the ABS ECU Unit needed to be sent off for repair/recondition.  Twice it was returned allegedly fixed but when put back on the car the DCS came on after about 100 yards of driving. 

 

ABS pump readings OK but a host of completely unrelated code errors came up (eg low brake fluid - not true etc). Some of these error codes could not even be cleared.   

 

Sent back to ECU repair specialists for a third time who now say it cannot be repaired.

 

So, I am after advice on my options?  They seem to be buying a brand new unit from BMW. This is clearly a very expensive option as the unit comes complete with the associated pump etc (which is probably working) and would need programming.  

 

A second option I am being given is buying a second hand ECU (which would cost around half a new one) but I am unclear whether it is possible to recode a second hand ECU to my car?   The chap I am dealing with says that sometimes it can be done but not always.  It would cost about half as much as a new one, but would be a gamble, I guess, if it doesnt work or cannot be recoded/programmed to my vehicle.  

 

I hope this makes sense but as you may have gleaned from my less than technical description I am no expert on car electronics.

 

I will be speaking to BMW but I suspect they will only be able to quote a price for replacing the whole thing which is likely to be in excess of £2k.

 

Any thoughts or advice appreciated, as ever.

Edited by gbrownings
add info

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50 minutes ago, Seesure said:

Sorry I can't add any information directly, but it might be worth asking the M5 forum - there are a few guys on there that seem to have answers to everything...

 

https://www.m5board.com/forums/e39-m5-and-e52-z8-discussion.3/ 

 

Thanks. Have registered and having a browse.  The ABS/DCS/tyre control inactive issue, all of which I have, seems like a bit of a minefield.    

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On 07/10/2019 at 17:35, gbrownings said:

Bit of a saga really which started with the ABS DCS and assorted orange lights coming on. Initial check came up as failed ABS front wheel sensor failure. Replaced but lights came back. Was recommended an experienced electronics person who did various tests but concluded that the ABS ECU Unit needed to be sent off for repair/recondition.  Twice it was returned allegedly fixed but when put back on the car the DCS came on after about 100 yards of driving. 

 

ABS pump readings OK but a host of completely unrelated code errors came up (eg low brake fluid - not true etc). Some of these error codes could not even be cleared.   

 

Sent back to ECU repair specialists for a third time who now say it cannot be repaired.

 

So, I am after advice on my options?  They seem to be buying a brand new unit from BMW. This is clearly a very expensive option as the unit comes complete with the associated pump etc (which is probably working) and would need programming.  

 

A second option I am being given is buying a second hand ECU (which would cost around half a new one) but I am unclear whether it is possible to recode a second hand ECU to my car?   The chap I am dealing with says that sometimes it can be done but not always.  It would cost about half as much as a new one, but would be a gamble, I guess, if it doesnt work or cannot be recoded/programmed to my vehicle.  

 

I hope this makes sense but as you may have gleaned from my less than technical description I am no expert on car electronics.

 

I will be speaking to BMW but I suspect they will only be able to quote a price for replacing the whole thing which is likely to be in excess of £2k.

 

Any thoughts or advice appreciated, as ever.

 

@Clavurion any ideas on this one?

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Any post 9/98 DSC module (Bosch 5.7) can be coded properly with for example NCS expert. With DSC you also have to set steering angle sensor with diagnostics. New Bosch units (1 265 950 002) are also available but the price has gone quite high during the last few years.

 

You could also ask your garage to get a quote from ACtronics if they still could refurbish your unit.

https://www.actronics.co.uk/

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22 minutes ago, Clavurion said:

Any post 9/98 DSC module (Bosch 5.7) can be coded properly with for example NCS expert. With DSC you also have to set steering angle sensor with diagnostics. New Bosch units (1 265 950 002) are also available but the price has gone quite high during the last few years.

 

You could also ask your garage to get a quote from ACtronics if they still could refurbish your unit.

https://www.actronics.co.uk/

 

Hi thanks for this. I am pretty sure it was ACtronics who eventually deemed it unrepairable.  I need the car (and MoT is due soon) so have opted to get a new unit (just the control unit) from BMW for about £1k which will be coded by someone who I am assured has the necessary equipment to access and download the original factory coding from BMW HQ in Germany.

 

There was a fault reading relating to the pump at one point (although all checks showed it to be working properly) so the expectation/hope is that this was coming up as a result of the failed unit.  

 

Not sure if I am doing the right thing but confess to having been well and truly bamboozled by technical jargon and acronyms for about two months over this issue!

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9 minutes ago, gbrownings said:

 

Hi thanks for this. I am pretty sure it was ACtronics who eventually deemed it unrepairable.  I need the car (and MoT is due soon) so have opted to get a new unit (just the control unit) from BMW for about £1k which will be coded by someone who I am assured has the necessary equipment to access and download the original factory coding from BMW HQ in Germany.

 

There was a fault reading relating to the pump at one point (although all checks showed it to be working properly) so the expectation/hope is that this was coming up as a result of the failed unit.  

 

Not sure if I am doing the right thing but confess to having been well and truly bamboozled by technical jargon and acronyms for about two months over this issue!

 

If you not yet ordered the part from BMW you can get the very same part a bit more reasonable price as BOSCH part.

 

https://www.ebay.co.uk/itm/BOSCH-Tools-1-265-950-002-Discount-Car-Parts/192754081426?epid=249230552&hash=item2ce109de92:g:5csAAOSwnMRdNRQK

 

https://www.ebay.com/itm/BOSCH-Control-Unit-Parts-SET-for-ABS-Fits-BMW-Z8-E52-E39-E38-Wagon-1994-2004/162510953783?epid=1922179830&hash=item25d6685d37:g:kCIAAOSw5~pccspw

 

Those pressure sensor / pre-charge pump problems are usually caused by failed module (supply voltage from module to pre-charge pump fails).

Edited by Clavurion

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1 hour ago, Clavurion said:

 

If you not yet ordered the part from BMW you can get the very same part a bit more reasonable price as BOSCH part.

 

https://www.ebay.co.uk/itm/BOSCH-Tools-1-265-950-002-Discount-Car-Parts/192754081426?epid=249230552&hash=item2ce109de92:g:5csAAOSwnMRdNRQK

 

https://www.ebay.com/itm/BOSCH-Control-Unit-Parts-SET-for-ABS-Fits-BMW-Z8-E52-E39-E38-Wagon-1994-2004/162510953783?epid=1922179830&hash=item25d6685d37:g:kCIAAOSw5~pccspw

 

Those pressure sensor / pre-charge pump problems are usually caused by failed module (supply voltage from module to pre-charge pump fails).

 

Thanks again. I appreciate you taking the time to help.  Unfortunately I have already committed to buying from BMW (arrives tomorrow). To be honest, although it is more expensive, I generally prefer to buy from a main dealer as it comes with warranty etc and I am a little less confident about using ebay. 

 

Fingers crossed on the pump.

 

 

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20 hours ago, gbrownings said:

 

Thanks again. I appreciate you taking the time to help.  Unfortunately I have already committed to buying from BMW (arrives tomorrow). To be honest, although it is more expensive, I generally prefer to buy from a main dealer as it comes with warranty etc and I am a little less confident about using ebay. 

 

Fingers crossed on the pump.

 

 

 

You'd have been absolutely fine with buying from Mister Auto via their eBay shop; long standing tried & tested reseller and you'd have got the full Bosch warranty also :) 

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53 minutes ago, d_a_n1979 said:

 

You'd have been absolutely fine with buying from Mister Auto via their eBay shop; long standing tried & tested reseller and you'd have got the full Bosch warranty also :) 

 

Next time (although hopefully there won't be one!)

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UPDATE:

 

New unit fitted and all the orange lights are out and everything seems to be working as far as the braking system is concerned :)......however

 

The engine oil temperature gauge goes straight to maximum 150 - the car has only been driven for a few minutes. Water temp gauge is normal

The red battery warning is on - the car is turning over perfectly normally

The dashboard warning has come on a couple of times to say "check oil level" - it is fine. 

 

:unsure:  Any thoughts?

 

Seeing the electronics guy again tomorrow but so far I am being told this is nothing to do with the coding that was done today although the battery could have been drained during the process and a long drive should sort it out. 

 

thanks....

 

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hi. yes, the altermator was checked and was shown to be working fine. The battery itself was apparently very slightly down on normal which might be, I was told, because it would have been drained during the coding which took some time and so a long run should sort it out.  I am relunctant to go on a long run with the oil temperature on maximum, even though I am sure this is a faulty reading.  

 

Looking at forums it seems there is a sensor for the oil temp and oil level somewhere in the sump.  It might be a coincidence but is it possible the re-coding could have messed this up? 

 

thanks again.

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1 hour ago, gbrownings said:

Looking at forums it seems there is a sensor for the oil temp and oil level somewhere in the sump.  It might be a coincidence but is it possible the re-coding could have messed this up? 

 

Starts to sound there is something wrong with the coding (coding of instrument cluster which would have been unnecessary). Otherwise it would be too much of a coincidence if these problems came after coding. If the voltage/charging is OK I don't think a weak battery would explain those symptoms. Also sounds a bit strange that they didn't connect a power supply if the coding took longer time. With NCS for coding and DIS for adjusting the steering angle sensor this would have been a few minutes job.

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They did connect a power supply for the coding. I guess there is still quite a lot of power being consumed with doors/bonnet open etc. I dont know what was used for coding but it allegedly took a couple of hours. The steering angle sensor issue was also addressed.  

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45 minutes ago, gbrownings said:

They did connect a power supply for the coding. I guess there is still quite a lot of power being consumed with doors/bonnet open etc. I dont know what was used for coding but it allegedly took a couple of hours. The steering angle sensor issue was also addressed.  

 

A couple of hours?? What on earth have they done during that time. Even the old original BMW Progman doesn't take nearly that long. A proper power supply will give enough current (with E39 max 40 amps) so the battery is not drained at all.

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15 hours ago, Clavurion said:

 

Starts to sound there is something wrong with the coding (coding of instrument cluster which would have been unnecessary). Otherwise it would be too much of a coincidence if these problems came after coding. If the voltage/charging is OK I don't think a weak battery would explain those symptoms. Also sounds a bit strange that they didn't connect a power supply if the coding took longer time. With NCS for coding and DIS for adjusting the steering angle sensor this would have been a few minutes job.

 

Hi, appears to be all sorted. No lights, warnings and all gauges working.

 

It seems there was a blown fuse causing the issues after coding. 

 

I really appreciate the help you offered on this.  Cheers.  

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22 hours ago, gbrownings said:

The dashboard warning has come on a couple of times to say "check oil level" - 

 

 

Mine does that every 6-700 miles.... ;) and usually needs a sip of the amber nectar...

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3 minutes ago, Seesure said:

 

 

Mine does that every 6-700 miles.... ;) and usually needs a sip of the amber nectar...

 

:) It was doing it every time I turned the ignition off (despite having checked it each time and levels were fine).....:angry: 

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