Then it is only due to faulty HPS pump OR Steering Rack. But if there is no any leakege then it is difficult to prove that HPS pump/Rack is faulty. I fear that dealer will not agree your claim. TATA people are famous for exployting FIAT owners. Two more possibility. Check the ball joints & Tie Rod ends. Check Air Pressure. Sometimes due to faulty air pressure station we inflate wrong figure. Avoid Electronic guage. Go at tyrewala at nukkad. As per my experience,Needle guage is more accurate than electronic.