Honda 2004 Odyssey Service Manual page 1125

Power Steering
Symptom Troubleshooting
Hard steering
1. Check the power assist (see page 17-7).
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 with T/N 07406-0010001 (see step 9 on page
17-9) or T/N 07406-001000A (see step 8 on page 17-
10).
Is the pressure 1,500 kPa ( 15 kgf / cm , 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 step 10 on page 17-9) or
T/N 07406-001000A (see step 9 on page 17-10).
Is the pressure 8.300 8.800 kPa ( 85 90 kgf / cm ,
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 step 11 on page 17-9) or T/N 07406-001000A
(see step 10 on page 17-10) 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 ,
1.210 1.280 psi) or less?
YES Go to step 6.
NO Replace the gearbox.
17-6
6. Adjust the rack guide (see page 17-29), and retest.
Is the steering OK ?
YES
NO
7. Check for feed and return lines between the pump
and the gearbox for clogging and deformation.
Are the lines clogged or def ormed?
YES
2
NO
8. Check the flow control valve (see page 17-17) for
smooth movement and leaks.
Is the f low control valve OK ?
YES
NO
2
9. Check the cylinder lines A and B for deformation
(see page 17-34).
Are the A or B lines def ormed?
YES
NO
10. Check for a bent rack shaft or misadjusted rack
guide (too tight).
Is the rack shaf t bent or the rack guide adjusted
too tight?
YES
guide.
NO
2
Repair is completed.
Replace the gearbox.
Repair or replace the lines.
Replace the valve body unit.
Replace the pump assembly.
Replace the flow control valve.
Replace the lines.
Go to step 10.
Replace the rack shaft or readjust the rack
Replace the valve body unit.