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(Post Link) post #1 of 10 Old 29-12-07 Thread Starter
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Engine Management Light

The dreaded engine management light came on this morning whilst driving home from work and the words MOTOR CONTROL SYSTEM FAILURE appeared on the display.

I consulted the manual which doesn't offer much of a clue.

At best I guess this could be a loose sensor connection or at worst a sensor failure?

Its a long shot but has anyone any suggestions?

Thanks

Ewan
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Re: Engine Management Light

Only had that issue repeatidely after the remap .... I guess this is not the answer to your question ?
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Re: Engine Management Light

CHF

Nope... however went to work last night - light on. Came home this morning - light off
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Re: Engine Management Light

I had a similar prob over the last couple of months. My light came on and stayed on, turns out on inspection of the code, a lambda churned out an out of bounds reading. Reset by garage and road test did not see a further issue.

2 weeks later, on it comes again. This time garage had for 2 days as they needed to do a cold test. Over many runs and actually doing a run using the r/t diagnostic the problem was pin-pointed to the actual sensor itself ( there are 4, EMS only gives 'a' lambda err ). Good work from the garage.

Replaced sensor and so far so good. I think in my case once an out of bounds reading came in, ie not a fuel delivery issue, then the code stays on as clearly the sensor is duff. So maybe in one 10 msec period it got an impossible reading, but kept it logged to show it is defective. If its going on and off itself then that suggests the sensor reading is in scope, but maybe still reading wrong, unless there is a real intermittent fuel problem ? Mine light came on both times during warm up ( say 7 miles into journey ) and probably the sensor throwing bad readings when moving from a small cold to hot window.

Just for info ....

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There's nothing in the dark that isn't there in the light ..... except fear
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(Post Link) post #5 of 10 Old 31-12-07 Thread Starter
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Re: Engine Management Light

Charlie8

Thanks for the info. I'll bear this in mind for future occurrances.

I'm considering buying the diagnostic software from Alfadiag to keep tabs on this and any other faults that arise as I'm sure they will!

I was about 12 miles into journey when fault occurred. No coughs or splutters just a loss of acceleration as EMS went into 'limp home' mode.

.... However - just received email from "Derek" stating the software does not support diesel ECUs

Last edited by EwanR; 31-12-07 at 15:10. Reason: Update
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Re: Engine Management Light

mine came up with that fault 2 wks ago. Air flow sensor. still under warranty? Mine was sorted under it.
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Re: Engine Management Light

Mine used to do this after it was remapped. It would generally happen when accelerating in 6th when doing around 70. It would reset if you switched the engine off and then on, and the light would go out after a couple of days. It used to do this if I used supermarket diesel, I now use Shell and it has not happened since.
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Re: Engine Management Light

I have the same issue. To date, well, originally the garage reset the computer. It was fine for a day. Came back on, went back in. New ECU fitted as they couldnt find a problem. Two weeks later fault comes back, coil replaced, new plugs, new radiator and a few other bits and pieces. Fault returns yet again. Garage seem to be doing all they can , but its really starting to grate on me now. Its back in a week Mon, heres hoping for the best....
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Re: Engine Management Light

bouncing_soul - was your coming on and staying in, ie beep, beep and MCSM message appears for about 3 secs, then goes, engine light on the dash lights and remains. Each start up MCSM message appears and goes with the engine light always on. No hickups or loss of power ever ? No clearance until reset by garage ?

If so then I'm exactly the same. The codes always showed lamba and when caught with R/T diagnostics replaced, only to show the same err a few days later.

Reading you list I'm convinced its not the 'system' that is in err here. Each time my came on it was about 7 miles into a run and when the temp was < 3 oC. I was told the fault is logged and remains if the ready is out of scope, so given the weeks in between happening it could be one reading can cause this, ie 10 millisecs of time is all it needs.

Need somesome who knows the ECM better to comment, but I think it is something very simple here going on, if emissions is too high I think the light flashes for the duration so not a fuel issue here. Battery sprung to mind reading the other threads on this, but not surely after 7 miles of running would it cause the singal drop to trigger this ? Could be connectors expanding upto temp etc etc

Puzzling, but I'm holding onto mine now after 2 trips to the garage uncovered nothing, I think its something that just needs research from other data based on similar stories, that is if the fault is exectly the same as my issue. Replacing an ECM to me means guess work by the garage.

C
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Re: Engine Management Light

ok people i have some information which may help, i have a 156 gta in brilliant blue on a 2002 02, a while after i had bought it sometimes when i would start the car the motor control failure light would appear it kept doing this on odd ocassions after many visits to main dealers and specialists i got in touch with alfa uk kicked up a massive stink they ran test after test after test after test anyway what they diagnosed it as eventually was that the centre console on the dash which gives time date, trip details on the early cars was faulty and they upgraded it to a later console which is slightly smaller in size and writing, anyway since this has been replaced the motor control failure light has never come back on
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