[QUOTE=And Socket 2 (the relevant, fuel system one): the LED came on dimly and stayed on when turned ignition to position II; on pressing the button on the ECM it lit up fully, but when released went back to the permanent dim light, without any flashing. It just stayed lit at this dim level until turned ignition off.
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I've noticed this as a downside to the diagnostice system. This happened to me in socket 1 when I was testing the remote central locking. A faulty control box caused this. In your case a spare ecu (as socket 2 is ecu related) to plug in would be handy to see if this led issue in socket 2 was to cease.
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