Hydraulic System Pressure Test
CAUTION:
DO NOT close pressure gauge shutoff valve for more than 15 seconds during engine operation. DO NOT hold steering wheel at or near lock position for more than 15 seconds.
- Install Pressure Gauge (ST27091000 ) between power steering pump and steering gear. See Fig 1 . Fully open shutoff valve and bleed air from system. See HYDRAULIC SYSTEM BLEEDING under LUBRICATION. Ensure fluid level is correct.
- Start engine, and allow to idle until reservoir fluid temperature is 140-176°F (60-80°C). Set engine speed to 1000 RPM. Check pressure quickly with steering wheel turned to full-lock position on left and right sides. Pump pressure should be 1109-1194 psi (78-84 kg/cm2 ).
- If pressure is greater than specification, check power steering pump flow control valve. If pressure is less than specification, slowly close and open shutoff valve and note pressure when valve is closed. DO NOT close shutoff valve for more than 15 seconds.
- If pressure is now within specification, power steering pump is okay and power steering gear is defective. If pressure is still less than specification, power steering pump is defective. Repair as necessary. Remove pressure gauge and bleed system. See HYDRAULIC SYSTEM BLEEDING under LUBRICATION. Ensure fluid level is correct.