Subaru Impreza 2003, Service Manual

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4AT-33
AUTOMATIC TRANSMISSION
ROAD TEST
4. Road Test
A: INSPECTION
1. GENERAL PRECAUTION
Road tests should be conducted to properly diag-
nose the condition of the 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
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 3rd gear engine brake when shifting
between D
⇔
3rd range while driving in 4th gear of
D range [50 to 60 km/h (31 to 37 MPH)].
• Check the 2nd gear engine brake when shifting
between 3
⇔
2 range while driving in the 3 range
3rd gear [40 to 50 km/h (25 to 31 MPH)].
• Check the 1st gear engine brake when shifting
between 2
⇔
1 range while driving in the 2 range
2nd gear [20 to 30 km/h (12 to 19 MPH)].
6. LOCK-UP FUNCTION
Check that engine speed does not change sharply
when the acclelerator pedal is lightly depressed
when 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. UNUSUAL SOUNDS AND VIBRATION
Check for unusual sounds and vibration while driv-
ing and during shifting.
9. CLIMBING CONTROL FUNCTION
• Check that the gear remains in 3rd when going
up a grade.
• Check that the gear remains in 3rd when apply-
ing the brakes while going down a grade.
10.TRANSFER CLUTCH
Check if the tight corner braking occurs when the
vehicle is started with steering wheel held at fully
turned position. (MPT model)
11.OIL LEAKS
After the driving test, inspect for oil leaks.