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Help whats code 140 activation map cooling ???

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Help whats code 140 activation map cooling ???

Postby weebazza » Tue, 16 Mar 2010 20:30:42 UTC

Hi, can anyone help, i recently had my water cooled alternator replaced on my 1999 540i, i know the battery had been disconnected
but when i got it back it suffers from a misfire when cold then is usually fine, the garage i use tried there diagnostic machine on it and got
the following code - 140 activation map cooling - but he does not know what that means, i have had a quick look on google
and it looks like something may need reprogramming but i thought it may be best to ask some of you guys to be sure.

Thank you
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Postby e-maps » Tue, 16 Mar 2010 21:32:47 UTC

The fault code 140 is the system that varies the engine water temperature to suit driving conditions. I do see this fault code a lot when mapping cars and none suffer from mis-fire so I dont think the cooling fault is connected to the mis-fire.
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Postby Clavurion » Tue, 16 Mar 2010 23:39:00 UTC

That code is caused by faulty thermostat or more specifically its electric control which fools the thermostat to lower engine temperature on high load. This doesn't cause any symptoms in regular driving and doesn't explain the misfiring. If you want to get rid of that code you'll need a new thermostat.
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Postby weebazza » Wed, 17 Mar 2010 09:15:36 UTC

Thanks, could disconnecting the battery again help at all with the misfire, i have spoken to a rac mechanic you says that would
reset the system back to base settings, is this right as my problems all started immediately after the battery was reconnected
after the alternator was fixed.
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Postby wreeve » Wed, 17 Mar 2010 12:27:01 UTC

I've replaced mine twice. Basically they consist of a resistor(coil) which is used to heat up the thermostat 'wax' to open it more and hence cool the engine more when needed. It's there to release a bit more torque under heavy load conditions. I noticed an improvement in my engine performance after replaced, not sure if that's wishful thinking or not, as it can't be worth much bhp wise but the ECU knows it's broken so could be running a safer map. Easy to change, get a BMW one as it's guaranteed for 2 years which I had to use after 1 when the first replacement failed!
2000 E39 540i (facelift, cheap tax!)
2001 E46 325i SE (facelift, not cheap tax!)
1985 Opel Monza GSE Coupe
1980 TR7 V8 Drophead Coupe
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Postby weebazza » Sun, 21 Mar 2010 13:04:30 UTC

Is it just the thermostat or is there anything else i should replace.
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Postby wreeve » Sun, 21 Mar 2010 18:54:17 UTC

Just the 'stat. If yours is a late car it will have the push on / off coolant hoses which are excellent! I didn't even bother to drain the system last time, you don't loose much coolant.
2000 E39 540i (facelift, cheap tax!)
2001 E46 325i SE (facelift, not cheap tax!)
1985 Opel Monza GSE Coupe
1980 TR7 V8 Drophead Coupe
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