Power Steering Systems On Early Subarus Part 2

Power Steering System Pressure Testing

If the troubleshooting procedures lead you to suspect a fault in the power steering system, perform a pressure test. The vehicle must be equipped with the specified tires and rims and the tires must be properly inflated. Then, bring the engine up to operating temperature before performing the test. Keep the following precautions in mind as well:

• Do not leave the pressure gauge valve closed for more than five seconds; doing so may damage the pump.
• Do not hold the steering wheel in the full lock position for longer than five seconds; this may damage the pump.
• Keep the engine speed at idle.
• Handle power steering fluid carefully; catch spilled fluid with shop cloths to prevent damage to the vehicle’s finish.

Power Steering Pressure Test

Attach pressure gauge 925711000, adapter A 926210000, and adapter B 926220000 to the discharge part of the pump, then perform the three pressure tests listed below.

Step 1: Regular pressure
Engine idling, valve open:142 psi (10 kg/cm2) or less

If No:
• Crimped Fluid line – Replace.
• Leaking fluid line – Tighten or replace.
• Clogged fluid line– Drain or replace.

Step 2: Relief pressure
Engine idling, valve closed:
L-series/Loyale SPFI: 40-55 kg/cm2 (569-782 psi)
XT/XT6: 60-75 kg/cm2 (853-1067 psi)
Legacy: 75-80 kg/cm2 (1067-1138 psi)
Worn pump SVX: 78-85 kg/cm2 (1109-1209 psi)

If No:
• Faulty relief valve
• Oil pump leak
• Worn pump
In all cases replace pump.

Step 3: Working Pressure
Engine idling, valve open, steering wheel turned stop to stop:
L-series/Loyale SPFI: 40-55 kg/cm2 (569-782 psi)
Loyale MPFI/XT/XT6: 60-75 kg/cm2 (853-1067 psi)
Legacy: 75-80 kg/cm2 (1067-1138 psi)
SVX:78-85 kg/cm2 (1109-1209 psi)

If No:
• Faulty control valve– Replace

If Yes:
• System Okay