ECU - not responding in VIDA

[gatos]

It might be possible, but I wouldn't know. If everything else you try, fails, I have a spare ECU, immobilizer, key and wireless alarm receiving unit that you can try on your car.

With regards to the MAF, it depends if it is a permanent or an intermittent fault. If it was unplugged and plugged in, then an intermittent code would be stored on the ECU. Your car will be running perfectly fine with no issues. If however it is a permanent fault, then your MAF has a problem and you would notice worse mpg

[dirrtyass]

Thank you gatos, i definitely appreciate that!

Something in Vida caught my attention: In the software tab, when you click on advanced, i can click "send reset". Is this something i can try out safely? Do you know what exactly this is for?

[gatos]

I would be very careful messing around with the Software Tab...... Can you post a screenshot of that reset page?

[shaun8478]

disconnecting the battery and waiting a while before reconnecting resets ecu's to factory settings on some cars.not sure about volvos though i would certainly try that before altering settings your unsure of.you never know it may just work.
hope all turns out well.
regards
shaun

[dirrtyass]

Thanks again everyone for your help.
I'll try disconnecting the battery today, and post an update later.

I somewhere read, that i need to hold together minus and plus (carside)
What's this about, and whats the "OEM way" to reset by disconnecting the battery? Someone also posted that's described in Vida, couldn't find it though.


@Gatos: Here are 2 screenshots of that reset option i was talking about

http://imageshack.us/f/809/erweitert.jpg
http://img708.imageshack.us/img708/5440/resetw.jpg

My car was not hooked up when i took the screenshots, thats probably why there is no serial number. ill check that too today.

Any clue what this is about?
Thank you!

Edit: quick update: MIL bulb works fine, lights up on position 2 and shuts off quickly.

[bigyin85]

Originally Posted by gatos

With regards to the MAF, it depends if it is a permanent or an intermittent fault. If it was unplugged and plugged in, then an intermittent code would be stored on the ECU. Your car will be running perfectly fine with no issues. If however it is a permanent fault, then your MAF has a problem and you would notice worse mpg

in that case then alex my air MAF must be F***ed, i'm only gettin 20-22mpg and about 210 miles to a full tank

[KBB]

Originally Posted by dirrtyass

Another strange thing is - the error codes were read of the ECU last week. I was in a Bosch car service shop, where they plugged in their own device. It was no Volvo device. They also tried to delete the error codes, but couldn't do that.

Is it possible that they somehow messed up my ECU?

Edit: The error code said MAF signal unplausible btw.

Thanks again for replying so fast ! :-)

Bosch sevice centres use the BOSCH KTS diagnostic platform, its one of the best systems and retails around 5k. No their system would not have caused any issue with your ECM.

When disconecting battery cables to induce a hard ECU reset the aim of conecting the live and ground cables is to de-energise the capacitors in many of the ECUs that act like batteries to keep ECU KAM (keep alive memory) saved. De-energising the CAPS alows the system to enter into adaptive re-learn.

Dose your EML light come on at first key on and go off as part of the bulb check? If not then this can be an indicator that the main ECU has not fully powered up, the other clue is when a scan tool cannot communicate with an ECU but you say the Bosch pulled a MAF code.

[dirrtyass]

Thank you for explaining the hard reset method.

Yes, the EML lights up on first key and shuts off quickly after that. The bulb is good. Ill try the hard reset tomorrow as i had no time today unfortunatly. Ill post an update tomorrow.

Thank you everyone for helping me out with your input.

[dirrtyass]

Ok so here's the update:

I tried the hard reset yesterday, disconnected the battery and zipped together plus and minus for 10 minutes. After reconnecting the battery i still have the same issue. ECM (Engine controle module) is not responding, hence it's red in the Network tab of Vida.

How is this possible? If the ECM is not responding, why is my engine running fine? And why did the Bosch KTS read an MAF error?

I'm really confused.. and out of ideas. Do you have anything more i can try out, before visiting the volvo dealer? I really fear they gonna say i need a new ECM...

I'm gratueful for any advice. Thank you.

Kind regards,
Erik

[KBB]

NO comms with the main ECU dose not instantly mean the ECU is faulty. It may well be your DICE unit or it's confuguration. I would check to see if the K line in the OBD2 socket is in good order up to the main ECM.

Allternatively try another OBD2 scan tool to see if you can obtain codes and read live data, that would confirm if the issue lies with your DICE.