I am observing this problem in my 1671 Km driven Altis 1.6 that whenever I fully rotate the steering wheel either clockwise or anti-clockwise, I hear a slight tuk tuk sound from steering wheel. The sound is not produced when the steering is turned full in either direction while the car is stationary and when the steering is rotated partially in either direction, while the car is moving. The tuk tuk sound is only produced when speed of car is lowered and steering is fully rotated in either direction to turn the car. Occasionally as well, the tuk tuk sound is not produced when the steering is fully rotated in either direction while the car is moving.
What could be the issue?
PS: A respected member @ahmadbila gave this possible explanation, which is being reproduced here under:
guys there is absolutely no need to panic on this.i hope u ve already figured it out but if not, let me explain.
you all know that steering wheel needs a constant supply of electric current to keep the horn alive.but u also know that steering wheel always remains in circular motion so no solid connections can be made with to provide current. that's why they connect the steering piece with the steering column ( for electric current) with a small metal strip which keeps on running on the metallic circular strip of the steering wheel. this way, the steering is always in connection with the electrical circuit for horn even if its being turned.
i made a pic to illustrate what i m talking about here.
now the problem is that somehow the grease which keeps the two rubbing smoothly drys out some how, may be they dont use enough of it or may be they dont use it at all.so all u have to do is get it greased and it ll be gone for ever.nothing to worry about.