Hydraulic Pressure

CAUTION:

Be sure to complete all items aforementioned in "INSPECTION", prior to measuring hydraulic pressure. Otherwise, pressure can not be measured correctly. Refer to INSPECTION , General Diagnostic Table.
Do not leave the valve of pressure gauge closed or hold the steering wheel at stop end for 5 seconds or more in any case, as the oil pump may be damaged due to long keep of these conditions.
Put cotton cloth waste at a place where fluid drops before pressure gauge is installed. Wipe off split fluid thoroughly after the measurement.

NOTE: Keep engine idling during the measurement.

MEASURE REGULAR PRESSURE.
1. Connect ST1, ST2 and ST3.
  ST1 925711000 PRESSURE GAUGE
  
  ST2 34099AC020 ADAPTER HOSE B
  
  ST3 34099AC010 ADAPTER HOSE A
2. Remove two bolts (1), then disconnect pipe C (2) from the pump.
3. Using gasket (Part No. 34621AC021) and bolt (Part No. 34620AC010), install ST2 to the pump instead of pipe C (2).
  
  Fig 1: Installing ST2 To Pump Instead Of Pipe C
  Courtesy of SUBARU OF AMERICA, INC.
4. Disconnect the pipe from pipe C (1).
5. Install ST3 to pipe C (1).
  
  Fig 2: Disconnecting Pipe From Pipe C
  Courtesy of SUBARU OF AMERICA, INC.
6. Replenish power steering fluid up to specified level.
7. Open valve, and start the engine.
8. Measure regular pressure.
  ST1 925711000 PRESSURE GAUGE
  
  ST2 34099AC020 ADAPTER HOSE B
  
  ST3 34099AC010 ADAPTER HOSE A
  
  Fig 3: Measuring Regular Pressure
  Courtesy of SUBARU OF AMERICA, INC.
  1. Service limit: 981 kPa (10 kg/cm² , 142 psi) or less
9. If it is not within the specified value, replace the troubled part caused by the following symptoms; pipe or hose clogged, leaks from fluid line, and mix of foreign objects in fluid line.
Measure relief pressure.
1. Using STs, measure relief pressure.
2. Close valve.
3. Measure relief pressure.
  ST1 925711000 PRESSURE GAUGE
  
  ST2 34099AC020 ADAPTER HOSE B
  
  ST3 34099AC010 ADAPTER HOSE A
  
  Fig 4: Measuring Relief Pressure
  Courtesy of SUBARU OF AMERICA, INC.
  1. Service limit: 7,159 - 7,748 kPa (73 - 79 kg/cm² , 1,038 1,123 psi)
4. If it is not within the specified value, replace the oil pump.
Measure working pressure.
1. Using STs, measure working pressure.
2. Open valve.
3. Measure working pressure of control valve by turning wheel from stop to stop.
  ST1 925711000 PRESSURE GAUGE
  
  ST2 34099AC020 ADAPTER HOSE B
  
  ST3 34099AC010 ADAPTER HOSE A
  
  Fig 5: Measuring Working Pressure Of Control Valve
  Courtesy of SUBARU OF AMERICA, INC.
  1. Service limit: 7,159 - 7,748 kPa (73 - 79 kg/cm² , 1,038 - 1,123 psi)
4. If it is within the specified value, measure steering effort. Refer to MEASUREMENT OF STEERING EFFORT , INSPECTION, General Diagnostic Table. If it is not within specified value, replace control valve itself or control valve and pinion as a single unit with new ones.