hello everyone,
i bought recently a second hand r51 2.5 dci from 2009 just for fun and second car use, but the fun was short because i have a trouble code p0409 , after searching on the w.w.w. i came with a electrical problem in the circuit.
in the service manual i found i have to chek the wiring from the egr to the ecm and there i found something wiered, pin 5 from egr harnes has to go to pin 81 ECM and pin 4 EGR has to go to pin77 ECM but they are swapped could this be a issue ?

can i swap the wiring ?
i attached the page from service manuel.
i hope some can give me a hand

With greatings