Component Tests and General Diagnostics

^ Tools Required:
- J 5176-E/D Power Steering Pressure Tester 0-2000 PSI and
- J 5176-92 18 mm Power Steering Gauge Adapter
- J 25323-A/B Power Steering System Analyzer
- J 29525-92 Power Steering Analyzer 18 mm Adapter
- Or Equivalents

If a hydraulic or mechanical malfunction of the pump or power steering gear is suspected, perform the following procedure to determine the cause.

NOTICE: Always use the correct fastener in the correct location. When you replace a fastener, use ONLY the exact part number for that application. The manufacturer will call out those fasteners that require a replacement after removal. The manufacturer will also call out the fasteners that require thread lockers or thread sealant. UNLESS OTHERWISE SPECIFIED, do not use supplemental coatings (paints, greases, or other corrosion inhibitors) on threaded fasteners or fastener joint interfaces. Generally, such coatings adversely affect the fastener torque and the joint clamping force, and may damage the fastener. When you install fasteners, use the correct tightening sequence and specifications. Following these instructions can help you avoid damage to parts and systems.

1. Place drain pan under remote reservoir.
2. Disconnect outlet hose at remote reservoir.
3. Connect spare pressure hose to remote reservoir.

Important: The power steering system may be tested using J 5176-D/E or J 25325-A. Testing with J 25323-A will measure flow rate as well as pressure.

4. Connect J 5176-D and J 5176-92 or J 25323-A and J 29525-92 to outlet hose and spare pressure hose.
5. Open valve on J 5176-D or J 25323-A.
6. Start engine and allow engine to reach normal operating temperature.
7. With engine at idle and valve open on J 5176-D or J 25323-A, pressure should be no more than 1,050 kPa (150 psi).

Important: If pressure is more than 1,240 kPa (180 psi), check the hoses for restrictions and proper valve on steering gear for proper

NOTICE: Do not leave the valve fully closed for more than 5 seconds as the pump could be damaged.

8. Fully close valve on J 5176-D or J 25323-A three times and record pressure reading each time. Each reading should show at least 6,895 kPa (1,000 psi). The three readings should be within 345 kPa (50 psi) of each other.
^ If pressure readings are high enough and are within 345 kPa (50 psi) of each other, pump is functioning properly.
^ If pressure readings are high enough but are not within 345 kPa (50 psi) of each other, control valve in pump is sticking.
A. Remove valve, clean it and remove any burrs using crocus cloth of fine hone.
B. If system contains some contamination, flush it.
^ If pressure readings are less than 6,895 kPa (1,000 psi), replace flow control valve and recheck.
^ If pressures are still low, replace rotor and vanes.
9. If pump checks to specification, leave valve open and turn steering wheel (or have someone else turn it) to both sides.
^ Record highest pressures and compare with highest pump pressure recorded earlier.
^ If pressure at both stops is not same as maximum pressure, steering gear is leaking internally and must be repaired.
10. Turn off engine.
11. Remove J 5176-D and J 5176-92 or J 25323-A and J 29525-92.
12. Connect outlet hose to remote reservoir.
^ Tighten hydraulic pump hose fitting nut to 28 Nm (21 ft. lbs.).
13. Bleed power steering system.