Hydraulic Pressure in P/S Circuit Check

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.

Special tool

(A): 09915-77411

(B): 09915-77420

(C): 09945-36010

Fig 1: Hydraulic Pressure in P/S Circuit Check
Courtesy of SUZUKI OF AMERICA CORP.
Check each connection for fluid leakage and bleed air. Refer to Air Bleeding Procedure .
With engine idling, turn steering wheel and warm up engine till temperature of fluid in tank rises to 50-60 °C (122-140 °F).

Fig 2: Checking Power Steering Fluid Temperature
Courtesy of SUZUKI OF AMERICA CORP.
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.

Fig 3: Checking Power Steering Fluid Pressure
Courtesy of SUZUKI OF AMERICA CORP.
Check relief pressure.
- Increase engine speed to about 1500 r/min. (rpm). Close gauge valve (2) gradually while watching pressure increase indicated by gauge and take reading of relief pressure (maximum hydraulic pressure).
  Relief pressure
  
  8200-8900 kPa (82-89 kg/cm² , 1166-1265 psi)
- 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 (4) or setting of relief valve spring.
  CAUTION: Be sure not to close gauge valve for longer than 10 seconds.
  
  Fig 4: Checking Power Steering Fluid Relief Pressure (Valve Closed)
  Courtesy of SUZUKI OF AMERICA CORP.
- Next, open gauge valve (2) fully and increase engine speed to about 1500 r/min. Then turn steering wheel to the left or right fully and take reading of relief pressure.
  Relief pressure
  
  8200-8900 kPa (82-89 kg/cm² , 1166-1265 psi)
- 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 (5). Replace gear box.
  CAUTION: Be sure not to hold steering wheel at fully turned position for longer than 10 seconds.
  
  Fig 5: Checking Power Steering Fluid Relief Pressure (Wheels Turned)
  Courtesy of SUZUKI OF AMERICA CORP.