Road Test - Subaru 2009 IMPREZA Service Manual

AUTOMATIC TRANSMISSION

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
4th 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. Check the shock
level during kick-down at the same time.
5. ENGINE BRAKE OPERATION
• Check the 3rd gear engine brake when shifting
down from 4th to 3rd range while driving in 4th gear
of manual mode [50 — 60 km/h (31 — 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 — 50 km/h (25 — 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 — 30 km/h (12 — 19
MPH)].
6. LOCK-UP FUNCTION
• When the accelerator is lightly depressed while
driving on a flat road in "D" range, check that rpm
does not change abruptly.
• Check slip lock-up with following procedure.
Subaru Select Monitor is required for judgement.
Before starting the check, make sure that no DTC
is displayed using the Subaru Select Monitor. If
there is a DTC, perform the corrective action ac-
cording to the DTC. Recheck to see that the DTC
has been cleared, then start the slip lock-up check.
1) The check is to be performed on a flat and
straight road or on a free roller.
NOTE:
• Slip lock-up will not operate when the vehicle is
lifted up off of its wheels, since there is no surface
resistance.
• When checking on the free roller, the driving re-
sistance will be slightly inadequate. It will be easier
to judge if the foot brake is lightly applied while per-
forming the check.
Road Test
2nd 3rd
4AT-30
2) Connect the Subaru Select Monitor.
3) Check the ATF temperature using the Subaru
Select Monitor.
NOTE:
• Make sure that the ATF temperature is between
50 — 100°C (122 — 212°F).
• If the temperature is low, warm up the ATF by
running the vehicle.
4) Start the engine, so that lock-up duty can be
read on the data display of the Subaru Select Mon-
itor.
5) Drive the vehicle at a constant speed of 35 — 40
km/h (22 — 25 MPH).
6) Read the lock-up duty while vehicle is running.
Specification
25 — 45%
NOTE:
• The reading may be slightly lower on a free roller.
• Slip lock-up control is not operating if the lock-up
duty is 5% or less, or when the lock-up duty goes
down immediately after starting to rise. In these
cases, improper ATF or deterioration of the ATF
may be the cause. Check the amount of ATF or re-
place the fluid, then recheck.
7. P RANGE OPERATION
Stop the vehicle on an uphill grade of 5% or more
and shift to the "P" range. Check that the vehicle
does not move when the parking brake is released.
8. NOISE AND VIBRATION
Check for noise and vibration while driving and dur-
ing shifting.
9. TRANSFER CLUTCH
Check for tight corner braking phenomenon when
the vehicle is moved forward with the steering fully
turned.
10.OIL LEAKAGE
After the driving test, inspect for oil leaks.