Hydraulic Pressure Check

HYDRAULIC PRESSURE IN P/S CIRCUIT CHECK





1. After cleaning joint of high pressure hose and P/S pump thoroughly, disconnect hose from pump and install special tool (oil pressure gauge, attachment and hose). Tighten each flare nut to specified torque.

CAUTION: Take care not to causes damage to A/C condenser during service operation, if equipped.

Special Tools
(A): 09915-77410 (Oil pressure gauge)
(B): 09915-77420 (Attachment & hose)
2. Check each connection for fluid leakage and bleed air.





3. With engine idling, turn steering wheel and warm up engine till temperature of fluid in tank rises to 50 - 60°C (122 - 140°F).





4. Check back pressure by measuring hydraulic pressure with engine idling and hands off steering wheel.
Back pressure: Lower than 1000 kPa (10 kg/cm2, 142 psi)
When back pressure is higher than specified values, check control valve and piping for clogging.
5. Check relief pressure





^ Increase engine speed to about 1,500 r/min (rpm). Close gauge valve gradually while watching pressure increase indicated by gauge and take reading of relief pressure (maximum hydraulic pressure).
Relief pressure:
7200 - 7900 kPa (72 - 79 kg/cm2, 1024 - 1123 psi). 1.6 liter
8200 - 8900 kPa (82 - 89 kg/cm2, 1166 - 1265 psi). 1.8 liter
^ When it is higher than specified values, possible cause is malfunction of relief valve.
^ When it is lower than specified values, possible cause is either failure of P/S pump or setting of relief valve spring.

CAUTION: Be sure not to close gauge valve for longer than 10 seconds.





^ Next, open gauge valve fully and increase engine speed to about 1,500 r/min. Then turn steering wheel to the left or right fully and take reading of relief pressure.
Relief pressure:
7200 - 7900 kPa (72 - 79 kg/cm2, 1024 - 1123 psi). 1.6 liter
8200 - 8900 kPa (82 - 89 kg/cm2, 1166 - 1265 psi). 1.8 liter
^ When it is higher than specified values, possible cause is malfunction of relief valve
^ When it is lower than specified values, possible cause is failure in steering gear box. Replace gear box.

CAUTION: Be sure not to hold steering wheel at fully turned position for longer than 10 seconds.