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NeilTM

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How can I find out how the engine management light is set to behave on a
55 Fabia 1.2 (BME engine)? The ECU is a Siemens 03E906033AB. Is there documentation anywhere that is accessible? An unhelpful VW/Skoda say there is no documentation, the secrets being locked into the ECU, but then the world now knows all about that particular crime!

I want to be able to find out the specific relationship between the
setting of codes and when the EML comes on, how long it could remain on
at a minimum, whether it could ever be extinguished though battery
disconnection, questions like that in order to prove a forensic on this
particular car which determined that a garage intoruduced a new fault in
the course of mending another. I have proved their narrative was false
by failing to clear codes or EML through battery disconnection they
claimed was the reason a claimed EML prior to the work disappeared after
the work involving their battery disconnection. I just lack a
documentary or authoratative source to back up my word against theirs in
claiming for the cost of remedying the fault they introduced.

Thanks for any advice, Neil
 
You won't find any documentation freely available on vehicle ECU's.
Imagine if the V.W ECU data had been freely available prior to the emissions scandal.

The only people outside of the manufacturer that know what's going on are people that remap them for power.
Even they won't let info go as they've spent years collecting it.

Dealers won't know what's going on, as usually when an ECU is updated it's done by connection to the factory.

You maybe able to pay a remapper to simulate a fault and note what happens.

What was the induced fault and how much did you spend correcting it?
 
I'm sure full warm up , cool down cycles come to count . So short journeys may not help ,
nor loose connections created / disturbed ! ,or caused by a recent pot-hole ?
--Plenty of grey-ness--
(As @snowhead - Mentions Re-mappers may have some tips -for a price)
 
What i can tell you is that the EML can come on for a vast array of reasons, many will clear when the fault is cleared automatically. Some can take longer to clear as the ECU will let a new reading stay stable for a period of time before the EML is eventually extinguished.
Some as you know can be extinguished with a battery disconnection, it really depends what type of faults you have been having.
Something i found out the other day whilst researching oil level sensors is that both a low and high level of oil in the engine will give an EML on Porsche and VW/Audi.
Sadly OEM ECU documentation is strictly controlled by the manufacturer, it is not on the internet
 
Also some faults are cumulative and will bring up codes related to particular parameters that cannot be met. Eg a partially clogged air filter will cause problems with fuel delivery as the metering will not be able to deliver the correct amount fuel per cylinder, this in turn may bring up more faults , or even put the vehicle in limp mode.
The ECU is analogue and deals with the faults in priority of the importance of the fault , so even if you temporary clear the faults with a reader and have not solved the original fault they will just come back.
 
How can I find out how the engine management light is set to behave on a
55 Fabia 1.2 (BME engine)? The ECU is a Siemens 03E906033AB. Is there documentation anywhere that is accessible? An unhelpful VW/Skoda say there is no documentation, the secrets being locked into the ECU, but then the world now knows all about that particular crime!

I want to be able to find out the specific relationship between the
setting of codes and when the EML comes on, how long it could remain on
at a minimum, whether it could ever be extinguished though battery
disconnection, questions like that in order to prove a forensic on this
particular car which determined that a garage intoruduced a new fault in
the course of mending another. I have proved their narrative was false
by failing to clear codes or EML through battery disconnection they
claimed was the reason a claimed EML prior to the work disappeared after
the work involving their battery disconnection. I just lack a
documentary or authoratative source to back up my word against theirs in
claiming for the cost of remedying the fault they introduced.

Thanks for any advice, Neil
You won't find any documentation freely available on vehicle ECU's.
Imagine if the V.W ECU data had been freely available prior to the emissions scandal.

The only people outside of the manufacturer that know what's going on are people that remap them for power.
Even they won't let info go as they've spent years collecting it.

Dealers won't know what's going on, as usually when an ECU is updated it's done by connection to the factory.

You maybe able to pay a remapper to simulate a fault and note what happens.

What was the induced fault and how much did you spend correcting it?
Thank you for your reply, it confirms what I didn't want to hear of
course. I know the documentations probably exist because I know someone
who was an engineer designing and coding for components to work with
ECUs, and he used to get them 'practically forced on him' by the
manufacturers he told me. They just don't want to share, and not much
guesswork needed to know why! :-(

It occurs to me though that there must be a pool of experience out there,
including model specific that know from experience how these things
behave because they work with them daily. Unfortunately all the
independent specialists I've pumped locally, only ever talk in vague
generalities, and haven't been able to help.

I don't want to discuss the specifics too easily searchable on an open
forum unfortunately, but would be willing to do so privately if anyone
might think they can help. It would be too easy for the garage in
question to find my so far fruitless searches online, although I suspect
they probably wouldn't bother, knowing that any old -------- is going to
be incapable of being disproved when it comes to the mysteries of ECUs,
and all I've been getting from them. I did consider talking to a
remapper if they would talk to me, but as any kind of expert witness in
court they would probably appear compromised through association with
illegal deletions of emissions devices.

It is very frustrating as I know I'm right, and we disconnected the
battery for twice the time they did and the EML came straight back on as
soon as it was reconnected, disproving their claim in this particular
case that their battery disconnection lost the EML. Pretty basic
architecture of the period I would imagine. Must be some literature at
some useful level somewhere surely? The 'permanent code' of most
interest was 16725 which is camshaft position sensor, which reported the
unwanted relocation of the valve timing 20degrees advanced which occurred
during counterclockwise rotation of the engine while they were replacing
that thing that works when you press the left hand pedal ;-) A known
vulnerability with those particular engines according to 3 other forum
sources I've found.

For 2017 onwards Fords I found this single A4 sheet which its equivalent
for my make, model and era would give me all I needed:

https://static.oemdtc.com/GSB/G0000122.pdf

Thanks again, and for the other replies also which really do underline my
mission impossible it seems. Wicked world.
 

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