Subaru Legacy IV (2008 year). Manual - part 671

4AT-32

Time Lag Test

AUTOMATIC TRANSMISSION

6. Time Lag Test

A: INSPECTION

NOTE:
When the select lever is shifted while the engine is
idling, there will be a certain time elapse or lag be-
fore shock is felt. This is used for checking the con-
dition of the low clutch, reverse clutch, low &
reverse brake and one-way clutch.
• Perform the test at normal operation fluid tem-
perature of 70 — 80°C (158 — 176°F).
• Be sure to allow a one minute or more interval
between tests.
• Make three measurements and take the average
value.
1) Fully apply the parking brake.
2) Start the engine.
Check the idle speed (A/C OFF).
3) Shift the select lever from “N” to “D” range.
Using a stop watch, measure the time which takes
from shifting the lever until the shock is felt.

Time-lag

Standard: 1.2 seconds or less

If “N”

o “D” time lag is longer than specified:

• Line pressure too low
• Low clutch worn
• One-way clutch not operating properly
• D-ring worn
4) In the same manner, measure the time lag of “N”
o “R”.

Time-lag

Standard: 1.5 seconds or less

If “N”

o “R” time lag is longer than specified:

• Line pressure too low
• Reverse clutch worn
• Low & reverse brake worn
• D-ring worn

4AT-33

Line Pressure Test

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 insufficient oil pressure for
the operation of clutch, brake or control valve.
1) Line pressure measurement (under no load):

(1) Before measuring line pressure, lift up the
vehicle.
(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 on both front and rear of all wheels.
(Same conditions as for a stall test)
(2) Measure the line pressure when the select
lever is in “R” or 2nd of manual mode with en-
gine under stall conditions.
(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.
(ATF will reach the temperature above after
idling the engine for approx. 30 minutes with the
select lever in “N” or “P”.)

3) Remove the test plug and attach the ST instead.
ST

498897200

OIL PRESSURE GAUGE
ADAPTER

4) Connect the ST1 with ST2.
ST1

498897200

OIL PRESSURE GAUGE
ADAPTER

ST2

498575400

OIL PRESSURE GAUGE
ASSY

5) Check for duty ratio changes by adjusting the ac-
celeration pedal position using the Subaru Select
Monitor.

6) Remove the ST and install the test plug.

Tightening torque:

13 N·m (1.3 kgf-m, 9.6 ft-lb)

(A) Test plug

AT-04673

(A)

Standard line pressure

Range

position

Line

pressure

duty ratio

(%)

Throttle

valve angle

Line pressure

kPa (kg/cm

, psi)

Manual

mode (2nd)

25 — 35

Full open

1,000 — 1,300

(10.2 — 13.3,

145 — 188)

15 — 25

Full open

1,500 — 1,850

(15.3 — 18.9,

217 — 268)

35 — 43

Full closed

500 — 800
(5.1 — 8.2,

72 — 116)

4AT-34

Transfer Clutch Pressure Test

AUTOMATIC TRANSMISSION

8. Transfer Clutch Pressure

Test

A: INSPECTION

Check the transfer clutch pressure in accordance
with the following chart in the same manner as line
pressure. <Ref. to 4AT-33, Line Pressure Test.>
ST

498897700

OIL PRESSURE ADAPTER
SET

498575400

OIL PRESSURE GAUGE
ASSY

NOTE:
• Before setting to FWD mode, install the spare
fuse on the FWD mode switch.

• If no oil pressure is produced or if it does not
change in AWD mode, there may be a problem in
the transfer duty solenoid or control valve body.
• If oil pressure is produced in FWD mode, there is
the same problem as the AWD mode.

(A) Test plug

Range

position

duty
ratio

(%)

Acceleration

opening

angle (%)

Standard transfer clutch

pressure

kPa (kg/cm

, psi)

AWD mode

FWD

mode

Manual
mode
(2nd)

Fully opened

(100)

1,000 — 1,200

(10.2 — 12.2,

145 — 174)

—

Adjust ON

Duty ratio to

60%.

500 — 700
(5.1 — 7.1,

72 — 101)

—

Fully closed

(0)

—

(0, 0)

N or P

Fully closed

(0)

—

AT-00021

( A )

4AT-35

Automatic Transmission Assembly

AUTOMATIC TRANSMISSION

9. Automatic Transmission

Assembly

A: REMOVAL

1) Set the vehicle on a lift.
2) Open the front hood and support with the hood
stay.
3) Disconnect the ground cable from battery.
4) Remove the air intake chamber and intake boot.
<Ref. to IN(H4SO)-7, REMOVAL, Air Intake Cham-
ber.>
5) Remove the air intake chamber stay.

6) Disconnect the following connectors and termi-
nals.

7) Remove the starter. <Ref. to SC(H4SO)-6, RE-
MOVAL, Starter.>
8) Remove the pitching stopper.

9) Separate the torque converter clutch assembly
from drive plate.

CAUTION:
• Be careful not to damage the mounting bolts.
• Be careful not to drop bolts into the converter
case.

(1) Remove the V-belt covers.
(2) Remove the service hole plug.
(3) Remove the bolts which hold the torque
converter clutch assembly to the drive plate.
(4) Place the wrench on the crank pulley bolt,
and remove all the bolts while rotating the crank
pulley a little bit at a time.

10) Attach the ST to the converter case.
ST

498277200

STOPPER SET

11) Remove the ATF level gauge.

NOTE:
Plug the opening to prevent entry of foreign parti-
cles into the transmission fluid.

12) Remove the throttle body. <Ref. to FU(H4SO)-
12, REMOVAL, Throttle Body.>

(A) Transmission harness connectors

(B) Transmission ground terminal

AT-01327

AT-04902

(A)

(B)

AT-03877

AT-00102

AT-00804

AT-01330

Content .. 669 670 671 672 ..