they would be the wires for the pump i reckon. They all cross into each other at the plug so the ecu knows when the pump is there and when it isnt. Its a cock of a setup.
code 54 is intercooler level sensor, you can just short the two wires togther. Should solve that.
EDIT: ok here is the info you might need to solve the drama if its not the intercooler level sensor.
http://www.gt4dc.co.uk/info/howto/20...ic_code_54.htm
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