Power Steering Symptom Troubleshooting - Hard Steering

Hard Steering


1.Check the power assist.

Is the starting load more than 29 N (3.0 kgf, 6.6 lbf)?


YES - Go to 2.


NO - Power assist is OK.n


2.Measure steady-state fluid pressure from the pump at idle.

Is the pressure 1,470 kPa (15 kgf/cm2, 213 psi) or less?


YES - Go to 3.


NO - Go to 7.


3.Measure the pump relief pressure at idle.

Is the pressure 8,150-8,850 kPa (83-90 kgf/cm2, 1,180-1,280 psi) or less?


YES - Go to 4.


NO - Faulty pump assembly.n


4.With a spring scale, measure the power assist in both directions, to the left and to the right.

Are the two measurements within 2.9 N (0.3 kgf, 0.66 lbf) of each other?


YES - Go to 5.


NO - Go to 8.

5.Measure the fluid pressure with shut-off valve and pressure gauge valve open, while turning the steering wheel fully to the left and fully to the right.

Is the pressure 8,150-8,850 kPa (83-90 kgf/cm2, 1,180-1,280 psi) or less?


YES - Go to 6.


NO - Faulty gearbox.n


6.Adjust the rack guide, and retest.

Is the steering OK?


YES - Repair is completed.n


NO - Faulty gearbox.n


7.Check the feed and return lines between the pump and the gearbox for clogging and deformation.

Are the lines clogged or deformed?


YES - Repair or replace the lines.n


NO - Faulty valve body unit or pump.n


8.Check the cylinder lines for deformation.

Are the lines deformed?


YES - Replace the lines.n


NO - Go to 9.


9.Check for a bent rack shaft or misadjusted rack guide (too tight).

Is the rack shaft bent or the rack guide adjusted too tight?


YES - Replace the rack shaft or readjust the rack guide.n


NO - Faulty valve body unit on the gearbox.n