| 1. | Check the power assist. Is the initial turning load more than 34 N (3.5 kgf, 7.7 lbf) ? YES - Go to 2. NO - Power assist is OK.n |
| 2. | Connect the P/S pressure gauge to the pump. |
| 3. | 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 4. NO - Go to 8. |
| 4. | Measure the pump relief pressure at idle. Is the pressure 7,850-8,550 kPa (80-87 kgf/cm2, 1,140-1,240 psi) or more? YES - Go to 5. NO - Go to 9. |
| 5. | With a spring scale, measure the power assist in both directions, to the left and to the right. Are the two measurements within 5.0 N (0.51 kgf, 1.12 lbf) of each other? YES - Go to 6. NO - Go to 11. |
| 6. | 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 7,850-8,550 kPa (80-87 kgf/cm2, 1,140-1,240 psi) or more? YES - Go to 7. NO - Faulty gearbox.n |
| 7. | Adjust the rack guide, and retest. Is the steering OK? YES - Repair is completed.n NO - Faulty gearbox.n |
| 8. | Check the outlet and return hoses and 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.n |
| 9. | Disassemble the pump. |
| 10. | Check the pressure control valve for smooth movement and leaks. Is the pressure control valve OK? YES - Faulty pump assembly.n NO - Faulty pressure control valve.n |
| 11. | Check the cylinder lines for deformation. Are any of the lines deformed? YES - Replace the deformed line.n NO - Go to 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.n NO - Faulty valve body unit.n |