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Contents Wiring diagrams Section: Power Steering System All sections

Hard Steering Acura MDX I

Power Steering System 1 illustration ~534 words

Hard Steering

  1. Check the power assist (see «STEERING WHEEL ROTATIONAL PLAY CHECK»(/acura/mdx/i-2000-2006/remont/manual-power-steering/#power-steering-system) ). Is the power assist more than 29 N (3.0 kgf, 6.5 lbf)? YES - Go to step 2. NO - Power assist is OK.
  2. Measure steady-state fluid pressure from the pump at idle with T/N 07406-0010001 (see «PUMP PRESSURE TEST WITH T/N 07406-0010001»(/acura/mdx/i-2000-2006/remont/manual-power-steering/#power-steering-system__pump-pressure-test-with-tn-07406-0010001) ) or with T/N 07406-001000A or T/N 07406-001A101 (see «PUMP PRESSURE TEST WITH T/N 07406-001000A OR T/N 07406-001A101»(/acura/mdx/i-2000-2006/remont/manual-power-steering/#power-steering-system__pump-pressure-test-with-tn-07406-001000a) ). Is the pressure 1,470 kPa (15.0 kgf/cm 2 , 213 psi) or less? YES - Go to step 3. NO - Go to step 7
  3. Measure the pump relief pressure at idle with T/N 07406-0010001 (see «PUMP PRESSURE TEST WITH T/N 07406-0010001»(/acura/mdx/i-2000-2006/remont/manual-power-steering/#power-steering-system__pump-pressure-test-with-tn-07406-0010001) ) or with T/N 07406-001000A or T/N 07406-001A101 (see «PUMP PRESSURE TEST WITH T/N 07406-001000A OR T/N 07406-001A101»(/acura/mdx/i-2000-2006/remont/manual-power-steering/#power-steering-system__pump-pressure-test-with-tn-07406-001000a) ). Is the pressure 8,300-8,800 kPa (85-90 kgf/cm 2 , 1,210-1,280 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 5.0 N (0.51 kgf, 1.12 lbf) of each other? YES - Go to step 5. NO - Go to step 9
  5. Measure the fluid pressure with T/N 07406-0010001 (see «PUMP PRESSURE TEST WITH T/N 07406-0010001»(/acura/mdx/i-2000-2006/remont/manual-power-steering/#power-steering-system__pump-pressure-test-with-tn-07406-0010001) ) or with T/N 07406-001000A or T/N 07406-001A101 (see «PUMP PRESSURE TEST WITH T/N 07406-001000A OR T/N 07406-001A101»(/acura/mdx/i-2000-2006/remont/manual-power-steering/#power-steering-system__pump-pressure-test-with-tn-07406-001000a) ) 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 8,300-8,800 kPa (85-90 kgf/cm 2 , 1,210-1,280 psi) or less? YES - Go to step 6. NO - Faulty gearbox.
  6. Adjust the rack guide (see «RACK GUIDE ADJUSTMENT»(/acura/mdx/i-2000-2006/remont/manual-power-steering/#power-steering-system__rack-guide-adjustment) ) 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 flow control valve (see step 10 ) for smooth movement and leaks. Is the flow control valve OK? YES - Faulty pump assembly. NO - Faulty flow control valve.
  9. Check the cylinder lines A and B for deformation (see «POWER STEERING HOSE, LINE, AND PRESSURE SWITCH REPLACEMENT»(/acura/mdx/i-2000-2006/remont/manual-power-steering/#power-steering-system__power-steering-hose-line-and-pressure) ). Are the A or B 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.

Scheme 3

Scheme 3: Steering Wheel Rotational Play Check
Scheme 3: Steering Wheel Rotational Play Check
  1. Turn the front wheels to the straight ahead position.
  2. Measure how far you can turn the steering wheel left and right without moving the front wheels. If the play is within the limit, the gearbox and steering linkages are OK. If the play exceeds the limit, adjust the rack guide (see «RACK GUIDE ADJUSTMENT»(/acura/mdx/i-2000-2006/remont/manual-power-steering/#power-steering-system__rack-guide-adjustment) ). If the play is still excessive after rack guide adjustment, inspect the steering linkage and gearbox (see «STEERING LINKAGE AND GEARBOX INSPECTION»(/acura/mdx/i-2000-2006/remont/manual-power-steering/#power-steering-system) ).