## Power Steering

#### Symptom Troubleshooting

17-20

Hard Steering

1. Check the power assist (see page 17-4).

Is the power assist more than 29 N (3.0 kgf, 6.6 lbf)?

YES - Go to step 2.

NO - Power assist is OK.

2. Measure steady-state fluid pressure from the pump at idle (see page 17-21).

Is the pressure 1,500 kPa (15 kgf/cm2, 213 psi) or less?

YES - Go to step 3.

NO - Go to step 7.

3. Measure the pump relief pressure at idle (see page 17-21).

Is the pressure 7,600 - 8,300 kPa (78 - 85 kgf/cm2, 1,110 - 1,210 psi) or less?

YES - Go to step 4.

NO - Go to step 8.

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 step 5.

NO - Go to step 9.

5. Measure the fluid pressure (see page 17-21) with shut-off and pressure gauge valves open, while turning the steering wheel fully to the left and fully to the right.

Is the pressure 7,600 - 8,300 kPa (78 - 85 kgf/cm2, 1,110 - 1,210 psi) or less?

YES - Go to step 6.

NO - Faulty gearbox.

6. Adjust the rack guide (see page 17-13), and retest.

Is the steering OK?

YES - Repair is completed.

NO - Faulty gearbox.

7. Check for 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.

8. Check the pressure control valve (see page 17-29).

Is the pressure control valve OK?

YES - Faulty pump assembly.

NO - Faulty pressure control valve.

9. Check the cylinder lines for deformation (see page 17-22).

Are the lines deformed?

YES - Replace the lines.

NO - Go to step 10.

10. 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.