ECU wiring diagram needed - secondary coolant pump not communicating

RekaA3Quattro

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Hi All and Happy New Year,
My 2009 A3 2.0 TDi Quattro threw the P261A fault code. Bought another secondary coolant pump, replaced the burnt one and now the new one gets all the electricity, it is working but does not communicate with the ECU, the check engine light is on with fault code P261C, so it is possible that the wiring was also injured.
Would you be able either to give advice on how to continue solving the issue or with a wiring diagram for the ECU?