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Discussion Starter #1
Hi all,
I'm really hoping you can help save me some money! I bought a 147 about a month ago, it started displaying the 'Motor Control System Failure' light about 2 weeks ago. I limped it to a mechanic my family has used for years, I trust him completely but he's not an Alfa specialist so may not know all the tricks to save me some cash.

He's read the ECU and says that a 'Throttle Position Sensor' fault is the problem. This would seem to be consistent with the fact that the engine idles fine but sometimes when you put your foot down the engine won't rev.

He's spoken to Alfa who say that my 2002 built 147 doesn't have a throttle position sensor, the ECU itself must be faulty. Apparently a new one of those costs about £1,000 and can't be taken from another car in a scrap yard or anything like that. He's sent the ECU to a firm that repairs them on a no fix no fee basis, but if they can't repair it I think I’m looking at a grand which would be heartbreaking!

He's taken the ECU out and cleaned it to no avail, if any of you electrical gurus have a suggestion I’ll be more grateful than you could ever know.

Even if you can’t help, thanks for taking the time to read about my problem!
Cheers,
Keelan
 

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Is the light you are getting the engine management light or injector light(same thing), it is most probably the air flow meter that is at fault, my 156 has just had a new air meter and ecu, apparently the meter blew the ecu and it cost £850. One way to check it is to unplug the air flow meter and then see if it revs freely, when these go the car will normally idle but have very little power/response.
 

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It does have a throttle position sensor...
It has a fly-by-wire throttle.
There are potentiometers in the throttle pedal which tell the ECU how far to open the throttle.
 

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There is a recent thread about 'Motor System Control Failure' being linked to a duff battery on here somewhere...
 

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There is a potentiometer on the throttle pedal that measures its travel ad DC says.

There is a plug on this and also the cable can get chafed (by clowns and other people with big shoes) to look at first, although the potentiometer itself may be duff.

A Bosch/ Lucas service place will be able to check that the potentiometer is working and that this is coming through.

Or go to a different Alfa Dealer!
 

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Mine's a selespeed but had a very similar problem yesterday, limped to my mechanic. He plugged in the examiner then dived inder the hood with a can of contact cleaner. Between the battery and the engine is a small plastic box about the size of a pack of fags. He opened that, pulled the electrical connector apart, flooded both ends with contact cleaner and smeared the female side with petroleum jelly and reassembled. Fee - free, so far so good.
 

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cj romeo said:
There is a potentiometer on the throttle pedal that measures its travel ad DC says.

There is a plug on this and also the cable can get chafed (by clowns and other people with big shoes) to look at first, although the potentiometer itself may be duff.

A Bosch/ Lucas service place will be able to check that the potentiometer is working and that this is coming through.

Or go to a different Alfa Dealer!
Best advice so far......get somebody to test the potentiomenters from the ECU end of the cable. Also get them to check at the potentiometers themselves to see if it's a cable/connector problem.
 

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Charltoncrazy said:
Hi all,
He's spoken to Alfa who say that my 2002 built 147 doesn't have a throttle position sensor, the ECU itself must be faulty.
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!:cry:

Might as well just deny ever having made it!!
 

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Discussion Starter #9
Bit of an update guys - Thanks for your help in identifying the fact that the car does have a throttle position sensor, i got back to the mechanic on this point and he's found it, tested it and found it to be OK. At the moment my ECU has been sent off to (apparently) the only company in the country that fix ECU's in Birmingham. They only charge a fee if they can repair it, otherwise they send it back so i don't think i can lose out (they guarantee their repairs with a warranty).

I'll let you guys know how it goes, thanks ever so much for all the help, it's much appreciated.
 

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Without wishing question the honesty of your mechanic I would have some serious reservations about someone testing a throttle position sensor which they only located after being told by me that it was there. Also I am somewhat concerned that Alfa apparently informed the mechanic that 2002 cars do not have a throttle position sensor!
If the read out says throttle position sensor my course of action would be to properly check all connections, wiring & potentiometers before assuming an ECU fault. The 147 is a great car but its wiring and connectors, as with most Alfa’s, are ……let’s just say not the most reliable. If I were you, I would find an independent Alfa specialist. From my experience most problems get sorted quicker and cheaper when you use one.
 

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I'm with you on that one Renone. There are plenty of Alfa specialists mentioned on this site who know their stuff and don't rip you off like the dealers (am I allowed to say that? I didn't mean they rip you off, I meant they charge more money for less work, oops, I didn't mean to say that out loud, I just meant to think it, doh, no I didn't). :D
 

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David C and co, spot on again, according to the illustration I've seen.So what does Alfa tech reckon, it's got a cable? Not surprised, I was informed some time back,(prior to getting the CD) that mine didn't have pollen filters!! Mind you, had to stand on 'me' 'Ead' to replace them. Have they got an official Tech Advice Dept.?
 

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Hi all,
Apparently a new one of those costs about £1,000
Keelan

I find that price a bit hard to believe, I had a new ECU put into my car 2 weeks ago for 400euro.(roughly £300)
The price was for the ecu and security codes was 300euro, labour was 66euro and the rest was vat.
I had it done by an independant alfa specialist.
 

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Discussion Starter #15
I was about to update everyone on how things have been going. Just got off the phone to my mechanic who said that a new motherboard for my ECU had been found by the company that he'd sent it to for repairs, this would be £300. Based on what you said in your post above Madson I phoned my local Alfa independent who said that a new ECU would be £300 fitted. Having told my mechanic this he found out from the ECU company that they supply reconditioned ECU's to my local Alfa specialist. Sorry to bore you with all that but long story short, i'm not 100% sure that was a new ECU you got for £300. It may have been reconditioned but i could well be wrong and it doesn't matter anyway, it'll still work.

If it is a brand new one then you've got yourself a great deal by the way, well done!

Apparently i'll have my car back by the end of the week, can't wait. i'll let you all know if it runs!
 

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Discussion Starter #17
Hi guys - Final update on this problem. Got the car back from the mechanic yesterday and it runs good as gold. He charged £300 parts for the new ECU motherboard and £80 labour for diagnostic and fitting work. Not too bad i think!
 

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Hi guys - Final update on this problem. Got the car back from the mechanic yesterday and it runs good as gold. He charged £300 parts for the new ECU motherboard and £80 labour for diagnostic and fitting work. Not too bad i think!
Did you get a new master key with it or did they somehow program the new ECU to recognise your old key?
 
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