Fiat 1996 Brava Service Manual page 515

Auto transmission and differential Bravo-Brava @u
6
v
Description and operation
21-27.
Road tests
These tests are for checking that the automatic transmission is working correctly under actual conditions
of use.
Carry out the following tests with the gearbox oil at normal operating temperature.
Test in position D with NORMAL or SPORT driving mode
Move the selector lever to position D and carry out the following tests with the accelerator pedal in two
fixed positions, corresponding to 50% and 100% of the throttle valve aperture.
A) Changes to higher gears
Make sure that the gear changes 1 -2, 2-3 and 3-4 occur at the correct points of the gear change pro­
gram (see diagrams on pages 20, 21 and 22).
B) Jolts and slipping
In the same way, check that the jolts and slipping caused by the gear changes 1 -2, 2-3 and 3-4 are nor­
mal.
C) Locking lock-up clutch
At a speed of about 85 km/h, gently press the accelerator pedal and check that the engine rpm does not
change suddenly.
D) Vibrations and noises
Check under normal driving conditions that there are no vibrations or unusual noises.
E) Kick-down operation
Proceeding in second, third and fourth gears, with the selector lever on position D, fully press the accel­
erator pedal to close the kick-down switch and check that the limit speeds for the changes 2 - 1 , 3-2 and
4-3 conform to the gear change program.
F) Engine brake
Driving in fourth gear, move the selector lever sequentially from position D to positions 3, 2 and 1 and
perceive the engine braking effect at each of these gear changes.
Tests in position 3, 2 and 1 with NORMAL or SPORT driving mode
The above tests are repeated for each selector lever position.
Test in position R
Move the lever to position R, fully press the accelerator pedal to start the vehicle, checking that the slip­
ping is normal.
Test in position P
Stop the vehicle on a downhill slope, and after moving the lever to position P, release the brake pedal.
Check that the locking pawl prevents the vehicle from moving.
Test with manual operation of the gearbox
Disconnect the control module connectors. Test the vehicle on the road, making sure that whenever the
selector lever is moved, the gear changes take place in accordance wiht the table below.
Selector lever position
Gear engaged
P
Park
R
Reverse
N
Neutral
D
4th
3
4th
2
3rd
1
1st
NOTE With the selector lever at position N, the vehicle must not move spontaneously on a flat road.
With the selector lever at position P, the locking pawl must stop the vehicle moving even on a
downhill road.
38 Publication no. 506.670/06