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Home >> Subaru >> 1997 >> Impreza L Coupe F4-2.2L SOHC >> Repair and Diagnosis >> Steering and Suspension >> Steering >> Testing and Inspection >> Power Steering >> Hydraulic Pressure

Hydraulic Pressure

TOOL REQUIRED
- ST1 925711000 Pressure Gauge
- ST2 34099AC020 Adapter Hose B
- ST3 34099AC010 Adapter Hose A

CAUTION:
- Be sure to complete all items aforementioned in diagnosis by symptom, prior to measuring hydraulic pressure. Otherwise, pressure can not be measured correctly.
- 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. Install STs to power steering pump.
a. Drain the power steering fluid about 0.35 l (0.4 US qt.) from oil tank.
b. Remove two bolts securing power steering pipes to engine.
c. install ST1, 2 and 3 between power steering pump and pipes using gasket (Part No. 34621AC020 and bolt (Part No. 34620AC010).
d. Replenish power steering fluid up to specified level.
2. Open valve, and start the engine.
3. Measure regular pressure.
4. Is pressure 981 kPa (142 psi) or less?
Yes, Go to MEASURE RELIEF PRESSURE.
No, Trouble may be due to crushed pipe or hose, leakage from fluid line, foreign particles in fluid line, etc. Replace faulty parts with new ones.





MEASURE RELIEF PRESSURE
1. Using STs, measure relief pressure.
2. Close valve.
3. Is pressure 7,159 - 7,748 kPa (1,038 -1,123 psi)?
Yes, Go to step MEASURE WORKING PRESSURE.
No, Trouble may be due to malfunctioning relief valve, fluid leaking into oil pump interior, abnormal wear of pump vanes, etc. Replace faulty parts with new ones.





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.
4. Is pressure 7,159 - 7,748 kPa (1,038 -1,123 psi)?
Yes, Measure steering force.
No, Control valve is inoperative. Replace control valve itself or control valve and pinion as a single unit with new ones.
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