Hard Steering

1. Check the power assist.

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

YES | - | Go to Step 2 .
NO | - | Power assist is OK.■

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

Is the pressure 1,470 kPa (15 kgf/cm 2 , 213 psi) or less?

YES | - | Go to Step 3 .
NO | - | Go to Step 7 .

1. Measure the pump relief pressure at idle.

Is the pressure 8,150−8,850 kPa (83−90 kgf/cm 2 , 1,180−1,280 psi) or less?

YES | - | Go to Step 4 .
NO | - | Faulty pump assembly.■

1. 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 Step 5 .
NO | - | Go to Step 8 .

1. Measure the fluid pressure with both pressure gauge valves 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/cm 2 , 1,180−1,280 psi) or less?

YES | - | Go to Step 6 .
NO | - | Faulty gearbox.■

1. Adjust the rack guide, and retest.

Is the steering OK?

YES | - | Repair is completed.■
NO | - | Faulty gearbox.■

1. 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.■
NO | - | Faulty valve body unit or pump.■

1. Check the cylinder lines for deformation.

Are the lines deformed?

YES | - | Replace the lines.■
NO | - | Go to Step 9 .

1. 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.■
NO | - | Faulty valve body unit.■