Subaru IMPREZA GD 2007 Series Manual page 2538

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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 the post-
ed speed limit.
2. D RANGE SHIFT FUNCTION
Check shifting between 1st ←→ 2nd ←→ 3rd ←→
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
• Drive in 4th gear of the D range [50 — 60 km/h
(31 — 37 MPH)], and shift down to D ←→ → 3rd
range to check the engine brake in 3rd gear.
• Drive in 3rd gear of 3 range [40 — 50 km/h (25 —
31 MPH)], and shift down from 3rd ←→ → to 2nd
range to check the engine brake in 2nd gear.
• Drive in 2nd gear of 2 range [20 — 30 km/h (12
— 19 MPH)], and shift down from 2nd ←→ 1 range
to check the engine brake in 1st gear.
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 judgment.
Before starting the check, check that no DTC is dis-
played using the Subaru Select Monitor. If there is
a DTC, perform the corrective action according to
the DTC. Recheck that there are no DTCs dis-
played, then perform the 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.
2) Connect the Subaru Select Monitor.
Road Test
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 the 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.
Standard:
25 — 45%
NOTE:
The reading may be slightly lower on a free roller.
• Slip lock-up control is not operating when 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 replace 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. CLIMBING CONTROL FUNCTION
• Check for whether the vehicle will drive with the
gear fixed in 3rd when climbing hills.
• Check that while descending down a hill, the
gear remains in 3rd when the brakes are applied.
10.TRANSFER CLUTCH
Check for tight corner braking phenomenon when
the vehicle is moved forward with the steering fully
turned.
11.OIL LEAKAGE
After the driving test, inspect for oil leaks.
4AT-31
AUTOMATIC TRANSMISSION