Subaru IMPREZA 2002 Service Manual page 510

I
OIL PUMP
POWER ASSISTED SYSTEM (POWER STEERING)
3.
HYDRAULIC PRESSURE
CAUTION:
Be sure to complete all items aforementioned
in "INSPECTION", prior to measuring hydraulic
pressure. Otherwise, pressure can not be mea-
sured correctly. <Ref. to PS-74, 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 spilt fluid thoroughly after the measure-
ment.
NOTE:
Keep engine idling during the measurement.
1) MEASURE REGULAR PRESSURE.
(1) Remove the two bolts securing power steer-
ing pipes to the engine.
(2) Install ST1,2 and 3 between power steering
pump and pipes using gasket (Part No.
34621AC021) and bolt (Part No. 34620AC010).
(3) Replenish the power steering fluid up to
specified level.
(4) Open the valve, and start the engine.
(5) Measure the regular pressure.
STI 92571 1000 PRESSURE GAUGE
ST2 34099AC020 ADAPTER HOSE B
ST3 34099AC010 ADAPTER HOSE A
~
l675A
Service limit:
981
kPa (IO kg/cd, 142 psi) or less
(6) If it is not within the specified value, replace
the troubled part caused by the following symp-
toms; pipe or hose clogged, leaks from fluid line,
and mix of foreign objects in fluid line.
2) Measure relief pressure.
(1) Using STs, measure the relief pressure.
(2) Close the valve.
(3) Measure the relief pressure.
ST1 92571 1000 PRESSURE GAUGE
ST2 34099AC020 ADAPTER HOSE B
ST3 34099AC010 ADAPTER HOSE A
I1
676A
Service limit:
TURBO model
7,350
-
8,036
kPa
7,164
-
7,840
kPa
(75
-
82 k @ d , 1,067
-
1,165 psi)
Non-TURBO model
(73
-
80
k & d ,
1,040
-
1,137 psi)
(4) If it is not within the specified value, replace
the oil pump.
(1) Using STs, measure the working pressure.
(2) Open the valve.
(3) Measure the working pressure of control
valve by turning wheel from stop to stop.
3) Measure working pressure.
ST1 92571 1000 PRESSURE GAUGE
ST2 34099AC020 ADAPTER HOSE B
ST3 34099AC010 ADAPTER HOSE A
1
-
675A
Service limit:
TURBO model
7,350
-
8,036
kPa
7,164
-
7,840 kPa
(75
-
82
k g k d ,
1,067
-
1,165 psi)
Non-TURBO model
(73
-
80
kg/Cd,
1,040
-
1,137
psi)
PS-68