If it has no spark it will probably be the output transistor has failed.
91 3.0 sei M. 4852 EXY Black
92 2.1 sed M. 5740 ECZ Sable Phenicien
92 3.0 V6-24. 5713 EXY Black
92 2.1 sd M. 5685 ENT Blue Sideral
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90 2.1sd M. 5049 EJV Mandarin
92 2.1sd A. 5698 EJV Mandarin
94 2.1sd A. 6218 ERT Triton
91 2.0si M. 5187 EWT White
ECU's set to no code have a nasty habit of reverting on cars while fault finding.
So if you know the original code that it was set to then mark it on the ECU case.
I managed to inadvertantly reset one on a 2.5 yesterday.
Did not come with original code and none of the usual suspects worked.
In the end I had to fit a spare ECU with known code.
I think Paul is after a series two 24v ecu, which presumably is different to that on your series one half-car David? With regards, Matthew T.
1989 V6 Exclusive (Poland car) - Now living in a local Motor Museum!
1990 V6sei auto (grey auto)
1990 V6sei manual (gold car)
1990 V6.24 Pallas (Germany car)
1990 V6.24v (Scotland car)
Other previous XM sold and broken too many to mention!
I wonder if the ECU fitted to the Xantia V6 is the same (or sufficiently the same) to enable a test swap.
Paul, you have an S1 Xantia V6 so there might be a thought.
Sadly, not having any full XM S2 V6 wiring diagrams I cannot confirm if they are the same. Be surprised if they were hugely different though...
Note though that a swap can only be done between keypad cars. If the XM ECU is Transponder/RFID immobilised (as per the S2 Xantia) then they cannot be swapped under any circumstances.
Only keypad immobilised ECUs can be swapped between vehicles.
All XM's were keypad immobilised.
None got RFID chips and ignition switch coils.
I would be careful about damage from swapping ECU's between models.
If the 2.5 ECU was anything to go by Citroen kept changing the embedded code.
Spare ECU's are hard to obtain.