IvIarkgraham
Premium Member
Registered: 27th Mar 04
Location: Ellesmere Port, Cheshire
User status: Offline
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is it just sensor faults that cause the em light to come on?
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luke85
Member
Registered: 26th Nov 07
Location: Chesterfield
User status: Offline
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It comes on if the ECU sees a vaule that is outside its pre set limits or a sensor fails one of its checks. for example If the coolant temperature sensor tells the ECU that the temp is 200 degrees then it will be ignored and the light put on
But certain engine faults can make the ECU put the light on without a faulty sensor, for example a vac leak will make it say that the engine is idling high
there are probably more examples but you get the idea 
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IvIarkgraham
Premium Member
Registered: 27th Mar 04
Location: Ellesmere Port, Cheshire
User status: Offline
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was sittin at 80 for a couple of miles and it came on and stayed on for 10 miles until i got out and went to the shop got back in and it stayed off
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deano87
Member
Registered: 21st Oct 06
Location: Bedfordshire Drives: Ford Fiesta
User status: Offline
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quote:
Originally posted by IvIarkgraham
was sittin at 80 for a couple of miles and it came on and stayed on for 10 miles until i got out and went to the shop got back in and it stayed off
Probably not related in any way, but. . .
. . .warren sent me an IACV which is didn't know whether it worked it not. Shoved it in, went for a drive, and the EML would randomly come in, but with no symptoms. Normally for about 30 seconds each time (enough to log a fault). Thought nothing of it, thought the ECU might work some magic or something. Anyway, when trying to parallel park outside my house, the throttle stuck open with the EML on. Wouldn't have noticed driving along, because the throttle would have been open.
Could be a similar problem may be?!
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IvIarkgraham
Premium Member
Registered: 27th Mar 04
Location: Ellesmere Port, Cheshire
User status: Offline
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supposed to be a brand new throttle. Or do you mean a dodgy icv?
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deano87
Member
Registered: 21st Oct 06
Location: Bedfordshire Drives: Ford Fiesta
User status: Offline
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Dodgey ICV. But normally you have other symptoms like fluctuating idle speeds and almost stalling when dipping the clutch at junctions.
[Edited on 07-03-2008 by deano87]
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IvIarkgraham
Premium Member
Registered: 27th Mar 04
Location: Ellesmere Port, Cheshire
User status: Offline
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none of that
any sensors do do with oil?
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luke85
Member
Registered: 26th Nov 07
Location: Chesterfield
User status: Offline
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There arent any sensors to do with oil for the ECU to look at ao oil problems cant cause the ECU light to come on
Have you read the code? what engine is it?
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IvIarkgraham
Premium Member
Registered: 27th Mar 04
Location: Ellesmere Port, Cheshire
User status: Offline
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no code
x14xe
will it show the code if the light isnt on anymore?
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deano87
Member
Registered: 21st Oct 06
Location: Bedfordshire Drives: Ford Fiesta
User status: Offline
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Should do. 30 seconds is enough to register a log iirc.
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