Subaru IMPREZA GD 2007 Series Manual page 2541

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AUTOMATIC TRANSMISSION
7. Line Pressure Test
A: MEASUREMENT
NOTE:
If the clutch or brake shows a signs of slipping or
shift feel is not correct, check the line pressure.
• Excessive shock during up-shift or if shifting
takes place at a higher point than for normal condi-
tions, this may be due to the line pressure being too
high.
• Slippage or inability to operate the vehicle may,
in most cases, be due to loss of oil pressure for the
operation of clutch, brake or control valve.
1) Line pressure measurement (under no load):
(1) Before measuring line pressure, raise the
vehicle on a lift.
(2) Maintain the ATF temperature at approx. 70
— 80°C (158 — 176°F) during measurement.
(ATF will reach the temperature above after
idling the engine for approx. 30 minutes with the
select lever in "N" or "P".)
2) Line pressure measurement (under heavy load):
(1) Before measuring line pressure, apply both
the foot and parking brakes with all wheels
chocked (Same as for stall test conditions).
(2) Measure the line pressure with the select le-
ver in "R" or "2" and with the engine under a stall
condition.
(3) Measure the line pressure within 5 seconds
after shifting the select lever to each position. (If
the line pressure needs to be measured again,
allow the engine to idle and cool it down for
more than 1 minute.)
(4) Maintain the ATF temperature at approx. 70
— 80°C (158 — 176°F) during measurement.
(The ATF will reach the temperature above, af-
ter idling the engine for approx. 30 minutes with
the select lever in "N" or "P".)
Line Pressure Test
3) Temporarily attach the ST to a suitable place in
the driver's compartment, remove the blind plug lo-
cated in front of the toe board and pass the hose of
the ST to the engine compartment.
ST 498575400
( A )
(A) Pressure gauge hose
(B) Hole in toe board (blank cap hole)
(C) Brake pedal
4) Remove the test plug and attach the ST instead.
ST 498897200
(A) Test plug
5) Connect the ST1 with ST2.
ST1 498897200
ST2 498575400
4AT-34
OIL PRESSURE GAUGE
ASSY
( B )
( C )
AT-00019
OIL PRESSURE GAUGE
ADAPTER
(A)
AT-02379
OIL PRESSURE GAUGE
ADAPTER
OIL PRESSURE GAUGE
ASSY