HI Kojai,
1. Try reconnect to a different MUT-2 and see if code 82 or 45 (if not mistaken) pop up.
2. Make sure correct ACD fluid and is sufficient.
3. Bleed the ACD electronically (MUT) or manually.
4. Check pressure sensor/switch (at the boot if not mistaken) and relays.
5. Check fuse at the battery (+) terminal.
6. Check ACD ecu and its wiring, socket not fried. (bottom passenger side)
7. If all above checked, your hydraulic pump is on the way to heaven i.e KONG!
p/s have u had a clutch changed recently?
Hope it helps.
Ta!