Hydraulic System Pressure Test
- With engine off, disconnect high pressure hose from pump. Install Oil Pressure Gauge (09915-77410 ), Oil Pressure Gauge Attachment (09915-77430 ), and Hose (spare part 49221-70C10 ) between power steering pump and rack and pinion unit. See Fig 1 . Tighten attachment fitting to 15-20 ft. lbs. (20-27 N.m).
- Bleed system with shutoff valve open. See HYDRAULIC SYSTEM BLEEDING . With engine idling, turn steering wheel lock-to-lock several times until fluid temperature in reservoir is 122-140°F (50-60°C).
- With steering wheel straight ahead and hands off steering wheel, check pressure gauge. If gauge reads more than 142 psi (10.0 kg/cm2
), check flow control valve, pressure hoses and pipes for restrictions.CAUTION: DO NOT leave shutoff valve closed longer than 10 seconds or pump may be damaged.
- Raise engine speed to 1500 RPM. Slowly close pressure gauge valve while watching gauge. Fluid pressure should be 640-924 psi (45-65 kg/cm2
). If fluid pressure is more than 924 psi (65 kg/cm2
), check for possible malfunction of pressure relief valve. If fluid pressure is less than 640 psi (45 kg/cm2
), check for possible incorrect setting of pressure relief valve spring.CAUTION: DO NOT hold steering wheel fully turned longer than 10 seconds or pump may be damaged.
- Open pressure gauge valve. Maintain engine speed at 1500 RPM. Check pressure gauge reading while turning steering wheel lock-to-lock. Fluid pressure should be 640-924 psi (45-65 kg/cm2 ). If pressure reading is less than 640 psi (45 kg/cm2 ), repair or replace power steering rack and pinion assembly.