Insufficient Power Assistance

1. Is Fluid Level Correct?
YES Go to step 3.
NO Fill/bleed system
2. Is Problem A Leak?
YES Diagnose: see Power Steering Fluid Leaks. Power Steering Fluid Leaks
NO Continue:
3. Is Drive Belt Tension Correct?
YES Go to step 5.
NO Re-tension drive belt.
4. Is Problem Resolved?
YES End
NO Continue
5. Carry Out Pressure Test At Idle And 1000 rpm.
See power steering system. System Pressure Test
6. Is Correct Pressure Achieved?
YES Steering box defective
NO:
Not at any speed go to step 9.
Not at idle go to step 7.
7. Is Idle Speed Correct?
YES Go to step 8.
NO Correct idle speed - See FUEL SYSTEM, Adjustment, Engine tuning.
8. Is Problem Resolved?
YES End
NO Go to step 9.
9. Bypass Steering Box Using Adapter Tap tool No. LRT-57-001, or equivalent.
10. Is Correct Pressure Obtained?
YES Defective steering box
NO Defective steering pump.

CAUTION: Do not hold steering wheel on full lock for more than 30 seconds in any one minute to avoid overheating fluid and possibly damaging seals.

NOTE:
^ Excessive pressure in the system is almost always caused by a faulty relief valve in the PAS pump.
^ Insufficient pressure in the system is usually caused by low fluid level or power steering pump drive belt slip, or one of the following:
- PAS system leaks.
- Faulty power steering pump relief valve.
- Fault in steering box valve and worm assembly.
- Leak at piston in steering box.
- Worn components in power steering pump or box.