Subaru 2009 IMPREZA Service Manual page 2670

3. HYDRAULIC PRESSURE
NOTE:
• To measure hydraulic pressure correctly, be
sure to complete all the items in "INSPECTION",
prior to performing the measurement. <Ref. to PS-
51, INSPECTION, General Diagnostic Table.>
• Do not leave the valve of pressure gauge closed
or hold the steering wheel at lock for 5 seconds or
more in any case, this can damage the oil pump.
• Before attaching a pressure gauge, place cloth
at locations where fluid is expected to spill. Wipe off
any spilt fluid completely after the measurement.
1) Regular pressure measurement
(1) Connect the ST1, ST2 and ST3.
ST1 925711000 PRESSURE GAUGE
ST2 34099AC020 ADAPTER HOSE B
ST3 34099AC010 ADAPTER HOSE A
(2) Remove the air intake duct.
(3) Disconnect the pipe C from pump.
(4) Using the gasket (Part No. 34621AC021)
and bolt (Part No. 34620AC010), install the ST2
to pump instead of pressure hose.
• Non-turbo model
(1)
(2)
(1) Suction hose
(2) Pressure hose
• Turbo model
(1)
(2)
(1) Suction hose
(2) Pressure hose
(5) Attach the ST3 to the end of pressure hose
which is removed from pump.
Oil Pump
POWER ASSISTED SYSTEM (POWER STEERING)
(6) Replenish power steering fluid up to the
specified level.
(7) Open the valve, and start the engine.
(8) Measure the regular pressure.
ST1 925711000
ST2 34099AC020
ST3 34099AC010
Service limit:
981 kPa (10 kgf/cm
(9) If it is not within the specification, replace the
problem part for the following problems. (Pipe
or hose clogged, leaks from fluid line, and mix-
ture of foreign matter in fluid line)
2) Measure the relief pressure.
(1) Using the STs, measure the relief pressure.
(2) Close the valve.
(3) Measure the relief pressure.
ST1 925711000
ST2 34099AC020
ST3 34099AC010
PS-00688
Service limit:
Non-turbo model:
7,350 — 8,050 kPa
PS-00459
(75 — 82 kgf/cm
Turbo model:
8,100 — 8,800 kPa
(83 — 90 kgf/cm
(4) If it is not within the specification, replace the
oil pump.
PS-47
PRESSURE GAUGE
ADAPTER HOSE B
ADAPTER HOSE A
(1) Valve
2
, 142 psi) or less
PRESSURE GAUGE
ADAPTER HOSE B
ADAPTER HOSE A
(1) Valve
2
, 1,066 — 1,167 psi)
2
, 1,174 — 1,276 psi)
PS-00152
PS-00153