Symptom Troubleshooting
Symptom Troubleshooting: Hard steering
Hard Steering
NOTE:
- Compare to a similar known-good vehicle.
- Check for suspension damage.
- Check the steering alignment.
- Check the tire condition and pressure.
1. Check the power assist. Power Assist Check
Is the initial turning load more than 29 N (3.0 kgf, 6.6 lbf)?
YES - Go to step 2.
NO - Power assist is OK at this time. Compare to a known-good vehicle.
2. Connect the P/S joint adapter (pump), P/S joint adapter (hose), and P/S pressure gauge T/N 07406-0010001, Power Steering Pump Pressure Test With T/N 07406-0010001 T/N 07406-001000A or T/N 07406-001A101 Power Steering Pump Pressure Test With T/N 07406-001000A Or T/N 07406-001A101 to the pump.
3. Measure steady-state fluid pressure from the pump at idle.
Is the pressure 1,470 kPa (15.0 kgf/cm2, 213 psi) or less?
YES - Go to step 4.
NO - Go to step 8.
4. Measure the pump relief pressure at idle.
Is the pressure 7,460-8,140 kPa (76-83 kgf/cm2, 1,080-1,180 psi) or less?
YES - Go to step 5.
NO - Go to step 9.
5. Using 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 6.
NO - Go to step 11.
6. Measure the fluid pressure with both pressure gauge valves open (if so equipped), while turning the steering wheel fully to the left and fully to the right.
Is the pressure 7,460-8,140 kPa (76-83 kgf/cm2, 1,080-1,180 psi) or more?
YES - Go to step 7.
NO - Faulty steering gearbox. Overhaul the steering gearbox. Overhaul
7. Adjust the rack guide, Adjustments and retest.
Is the steering OK?
YES - Repair is completed.
NO - Faulty steering gearbox. Overhaul the steering gearbox. Overhaul
8. Check the outlet and return hoses and the lines between the pump and the steering gearbox for clogging and deformation.
Are the lines clogged or deformed?
YES - Repair or replace the lines.
NO - Faulty valve body unit. Overhaul the steering gearbox. Overhaul
9. Disassemble the pump. Overhaul
10. Check the pressure control valve for smooth movement and leaks. Overhaul
Is the pressure control valve OK?
YES - Faulty pump assembly. Replace the pump assembly. Removal and Replacement
NO - Faulty pressure control valve. Replace the pump assembly. Removal and Replacement
11. Check the cylinder lines for deformation. [1][2]Power Steering Fluid Leakage Inspection
Are any of the line(s) deformed?
YES - Replace the deformed line(s).
NO - Go to step 12.
12. 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 preroad.
NO - Faulty valve body unit. Overhaul the steering gearbox. Overhaul