4 wires at the dem 1x 12v power .1x earth 2x can wires they should be around 2.1v and 2.7 v dont worry if a little higher ie 2.3 or 2.8v if you have these readings then wiring okay
ive seen this twice where both pump and dem went down so replacing dem only wont cure you need to replace pump too also when replacing pump remember replace filter
regards.
for future reference you can actually donnor dem but not sw it and see if that erases codes
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