Motor Control System Failure....Please Help! - Alfa Romeo Forum
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Motor Control System Failure....Please Help!

Hi

I've been reading the above "FYI - Motor Control System Failure" thread for some time, so I thought it was time to bite the bullet and buy a new battery. On changing the battery the VCD error I often got has disappeared for good (fingers crossed) however I'm still suffering the Motor Control System Failure.

This always occurs when I put my foot down in 3rd Gear; the car occasionally hesitates too during the sudden acceleration but then returns. I've also noticed that during harsh acceleration in 2nd gear the Motor Control System Failure doesn't light up but boy does the power drop, it feels like the engine is either getting flooded with fuel or not enough air is getting in. Is there anyone out there who has had a similar issue and managed to resolve it?

Oh and I forgot to mention, it's an Alfa 156 2.4 JTD 10v Veloce and the loss of power normally occurs around 2-3000rpm. The turbo sounds sweet and whines like it did the day I bought it, so I think the turbo isnít at fault as it does pull like a bat out of hell but this sudden loss of power has got me mystified. Could it be a sensor or something more serious?

Your help will be much appreciated.
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Help Re: Motor Control System Failure....Please Help!

Hi Joski
I notice this post has been around a while with no answers! I am afraid I have no answers, but a very similar problem. Air Flow meter changed today with no impact. Arrangement to go back to my knowledagble and helpful independent specialist next week to clean the two valves on the turbo - did you get yours fixed?
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Re: Motor Control System Failure....Please Help!

Hi Joski
I have the same problem with my 156 JTD, but it has got worse since I had the cambelt changed, people have said that it could be Lambard Sensor....
Let me know how you get on.
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I have the same problem (same model too). As I'm currently driving for economy I generally don't notice it but if I put my foot down in 3rd and hit 3000rpm the warning chime sounds, message appears for barely long enough to read it and power drops dramatically. Have experienced it in higher gears too.

Had VDC warning the other day (cold morning), not long started and traveling below 50mph I cornered quite hard and warning came up and stayed on for entire journey. When I reached destination I switched off and back on again and problem had cleared and has not come back since.
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The issue with the VDC warning in my case was definitely the battery. Even though the battery looked fine, charges well and held the charge....it wasn't giving out enough amps when required. The reason for this was that some of the plates not all of then had failed inside the battery. Therefore on level ground all was fine charging, starting and even checking the current. But when you took a hard corner or drove over a bumpy road the acid would move around in the battery and reduce the contact with the plates in certain parts, thus dropping the power output. Hence LOW current to ECU lots of faults.

The issue with regard to the MCSF could be a few things:

Firstly check all the small pipes leading from the turbo and around the engine bay for small holes. If in doubt just buy a length of tubing and replace them all. They can be bought from any good motor factors.

Secondly, clean your EGR valve and check the pin springs in and out. Also another good test is to pass 12v through it and check if the pin pops in and out. This pin controls the valve open and closed positions.

Thirdly, it could be the over boost sensor on the slam plate which the small pipe from the turbo goes in to. This will need replacing as cleaning it is not an option.

Fourthly, it could be the diaphragm on the turbo which controls the vacuum to the boost valve. This will need removing and cleaning, as they do get soothed up with carbon.

Finally, if all fails then the only option is to remove the turbo and remove all the carbon and soot from the vains in the turbo or just replace itÖ.VERY COSTLY!!

My problem was the diaphragm on the turbo unit; it was completely caked in soot and couldnít release the pressure from the turbo. Therefore causing the turbo to over boost, but once the revs dropped error disappeared and power returned. Obvious now

Follow the steps above before diving head first into buying a new turbo.

Hope this helps.
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Please could you tell me how you took the actuator off and how do you split it to get to the diaphram.
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