Subaru Legacy (2005 year). Manual - part 583

5AT-31

AUTOMATIC TRANSMISSION

Road Test

4. Road Test

A: INSPECTION

1. GENERAL PRECAUTION

Road tests should be conducted to properly diag-
nose the condition of automatic transmission.

NOTE:
When performing the test, do not exceed posted
speed limit.

2. D RANGE SHIFT FUNCTION

Check shifting between 1st 

←→ 2nd ←→ 3rd ←→

4th 

←→ 5th while driving on normal city streets.

3. D RANGE SHIFT SHOCK

Check the shock level when shifting up during nor-
mal driving.

4. KICK-DOWN FUNCTION

Check kick-down for each gear. Also check the
kick-down shock level.

5. ENGINE BRAKE OPERATION

• Check the 4th gear engine brake when shifting
down from 5th to 4th range while driving in 5th gear
of manual mode [50 to 60 km/h (31 to 37 MPH)].
• Check the 3rd gear engine brake when shifting
down from 4th to 3rd range while driving in 4th gear
of manual mode [50 to 60 km/h (31 to 37 MPH)].
• Check the 2nd gear engine brake when shifting
down from 3rd to 2nd range while driving in 3rd
gear of manual mode [40 to 50 km/h (25 to 31
MPH)].
• Check the 1st gear engine brake when shifting
down from 2nd to 1st range while driving in 2nd
gear of manual mode [20 to 30 km/h (12 to 19
MPH)].

6. LOCK-UP FUNCTION

Check that engine speed does not change sharply
when the accelerator pedal is lightly depressed
while driving on flat roads at normal speed in the
lock-up range.

7. P RANGE OPERATION

Stop the vehicle on an uphill grade of 5% or more
and shift to “P” range. Check that the vehicle does
not move when the parking brake is released.

8. NOISE & VIBRATION

Check for noise and vibration while driving and dur-
ing shifting.

9. OIL LEAKAGE

After the driving test, inspect for oil leaks from the
transmission body.

5AT-32

AUTOMATIC TRANSMISSION

Stall Test

5. Stall Test 

A: INSPECTION

NOTE:
The stall test is of extreme importance in diagnos-
ing the condition of automatic transmission and en-
gine. It should be conducted to measure the engine
stall speeds in “R” and “2nd of manual mode”.
Purposes of the stall test:
• To check the operation of automatic transmis-
sion clutch.
• To check the operation of torque converter
clutch.
• To check engine performance.
1) Check that the throttle valve opens.
2) Check that the engine oil level is correct.
3) Check that the coolant level is correct.
4) Check that the ATF level is correct.
5) Check that the differential gear oil level is cor-
rect.
6) Raise the ATF temperature by driving a distance
of 5 to 10 km (3 to 6 miles). Otherwise, idle the en-
gine to raise ATF temperature to 70 — 80

°C (158

— 176

°F) on Subaru Select Monitor. <Ref. to

5AT(diag)-17, READ CURRENT DATA, OPERA-
TION, Subaru Select Monitor.>
7) Place the wheel chocks at the front and rear of
all wheels and apply the parking brake.
8) Move the manual linkage to ensure it operates
properly, and then set to the “2nd on manual
mode”.

9) While depressing the brake pedal strongly, de-
press the accelerator pedal gradually.
10) When the engine speed is stabilized, quickly
record that speed and release the accelerator ped-
al.
11) Shift the select lever to “N” range, and cool
down the engine by idling it for more than one
minute.
12) Perform the procedure for “R” range in the
same way as “2nd on manual mode”.

NOTE:
• Do not continue the stall test for MORE THAN
FIVE SECONDS at a time (from fully closed throttle
to fully open throttle until stall speed reading). It
makes engine oil and ATF deteriorate and the
clutch and brake to be adversely affected.
• Be sure to cool down the engine for at least one
minute with the select lever set in “P” or “N” range
and with the idle speed lower than 1,200 rpm after
performing stall test.
• If the stall speed is higher than the specified
range, attempt to finish the stall test in as short a
time as possible, in order to prevent the automatic
transmission from sustaining damage.

Stall speed (at sea level):

TURBO MODEL

3,100 — 3,500 rpm

NON-TURBO MODEL

2,400 — 2,800 rpm

AT-01325

5AT-33

AUTOMATIC TRANSMISSION

Stall Test

Stall speed (at sea level)

Range

Possible faulty part

Less than specification

R

• Engine
• One-way clutch of the torque converter clutch

More than specification

2nd gear of manual 

mode

• Line pressure too low
• Forward brake
• Forward brake one-way clutch
• Direct clutch
• 3rd one-way clutch

R

• Line pressure too low
• Reverse clutch

Within specification

2nd gear of manual 

mode

• Reverse clutch
• One-way clutch of the torque converter

R

• Forward brake
• Forward brake one-way clutch
• Direct clutch
• 3rd one-way clutch
• One-way clutch of the torque converter

5AT-34

AUTOMATIC TRANSMISSION

Time Lag Test

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 the shock can be felt. Using this, check the
condition of forward brake, reverse brake, 1st one-
way clutch, forward one-way clutch and 3rd one-
way clutch.
• Perform the test at normal operation fluid tem-
perature 70 — 80

°C (158 — 176°F).

• Be sure to allow a one minute 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-lag which takes
from shifting the lever until the shock is felt.

Time-lag

Specification: 1.2 sec. or less

If “N” 

→ “D” time-lag is longer than specification:

• Line pressure too low
• Forward brake worn
• One-way clutch not operating properly
4) In the same manner, measure the time lag for
“N” 

→ “R”.

Time-lag

Specification: 1.5 sec. or less

If “N” 

→ “R” time lag is longer than specification:

• Line pressure too low
• Reverse brake worn