Troubleshooting attesa 4wd

[excitinglsd]

Hi, my 4wd in my stagea doesn't want to work with or without the 50/50 button pressed, sometimes there is both the 4wd and abs lamp on but I don't know how to check the codes, where does the ecu even sit? But the 4wd doesn't work even when the light isn't on when I spin the front wheel the axel to the gearbox does rotate, the oil for the attesa is there. I don't really know how to check if the pump is working or not. Help would me appreciated thanks

[excitinglsd]

Anyone?

[m35stagea]

buy nissan data scan 2 and the equivalent vag cord you can log in to check error codes

[zoomzoom]

Have a search for attesa ECU codes. There's a flashing LED on the ECU which sits behind the passenger side interior trim, just behind the rear strut tower. It flashes when the car is running and there is an error code.