i recently removed my rack from my R33 gtr, i noticed that plug was attched to the steering rack, i had to unplug to remove the rack. isnt it attched to the steering angle sensor on the rack its self? it might read how much pressure is flowing via the power steering fluid when u turn, and relay that back to the ecu which then tells other sensors such as hicas when to operate.
So if u were turning at speed the pressure would rise in the power steering fluid as it pumps, and then the sensor would pick it up and tell the ecu which tells hicas to turn to assist steering angle.
Thats just what i think would happen with these sensors, and im sure they dont last for ever and there for will fail eventually. we need to find out a way to test the sensors on the vehicles and then also where to get replacements from?
If anybody knows this info, im sure it would help out alot of people. Just so we can illiminate another problem with the hicas/steering etc.