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4wd isn't working and so trying to diagnose. Tried to bleed the system yesterday but after disconnecting the green/white plug (pic attached), The pump didn't run and i could take the bleed valve completely out of the transfer case. Someone suggested getting access to the Attesa ECU and reading the faults from that via flashing LED. I got to the ecu but i couldn't see any blinking lights or anywhere that could blink? (pictures attached) Am i missing something here?

Just picked up my Skyline this week. 2004 6MT Coupe. Apart from the noises I'm about to attempt to describe, it goes hard and I'm very impressed! For its age, it's aesthetics and performance are phenomenal, and the exhaust note is ridiculous, I'm not 100% if it's stock, sounds like a subaru at low speed and then opens up to a higher octave roar . Wish I had bought this before buying my Holden SV6. Noise #1. Whirring-Propeller like noise. (rear) It occurs in tandem with the speed of the car. Emitting from the rear. Faster I go the louder it "whirs", kind of like the sound of a high speed fan makes. Isn't affected by gear change, I coasted in neutral for a bit and it still whirred. After a bit of research, I've narrowed it to potentially being: The tyres, the wheel bearings, or the rear differential. Anyone else had a similar occurrence? Noise #2. Squeaking on left turn. (frontish?) When I turn left, some times right, it will squeak like I am applying the brakes (the noise that is), it'll keep squeaking when I straighten up, until I increase the speed, then it disappears. New brake pads? or something worse? Any help will be much appreciated! I will definitely be taking it to a mechanic on a day off and have everything inspected, but I'd like to go in with a bit of an idea as to the problem. Just figured there may be a simple fix to a known issue that a mechanic unfamiliar with the car may not know. Thanks again.