Re: Citroen xsara Picasso 2.0 hdi. by GiveMeABreak » Sun Apr 17, 2016 5:31 pm. A U1000 can signify: The engine ECU no longer communicates on the network : Not characterised. Without a secondary code, this likely means that your Engine ECU is not communicating with the car and therefore it can't start.
service on a '52 plate xsara petrol 1.8, only because I had previously serviced the owner's Vectra. Once serviced I tried to reset the service indicator, followed the latest instructions from Autodata : press and hold the 000 button and turn on ign. Nothing happened, no countdown, no reset of the spanner symbol (which is what should happen)
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