Problem Symptom Confirmation (Road Test)
ROAD TESTNOTE: Perform the test at the ATF temperature of 50 - 80 °C (122 - 176 °F) in the normal operating.
a. D position test
Shift into the D position, depress the accelerator pedal fully and then check the following points:
1. Check the up-shift operation.
1->2, 2->3 and 3->O/D, up-shifts take place at the shift point shown in the automatic shift schedule.
HINT:
- O/D Gear up-shift Prohibition Control (1. Coolant temp. is 50 °C (122 °C) or less. 2. If there is a difference of 10 km/h (6 mph) between the set cruise control speed and vehicle speed.)
- O/D Gear Lock-up Prohibition Control (1. Brake pedal is depressed. 2. Coolant temp. is 50 °C (122 °C) or less.)
2. Check for shift shock and slip.
Check for shock and slip at the up-shift operation of 1->2, 2->3 and 3->O/D.
3. Check for abnormal noise and vibration.
Run at the D position lock-up or O/D gear and check for abnormal noise and vibration.
HINT: The check of the cause of abnormal noise and vibration must be made very thoroughly, as it could be due to the loss of balance in the differential or torque converter clutch, etc.
4. Check the kick-down operation.
While running in the D position, 2nd, 3rd and O/D gears, check that the possible kick-down vehicle speed limits of 2->1, 3->2 and O/D -> 3 kick-downs conform to those indicated on the automatic shift schedule.
5. Check abnormal shock and slip at kick-down.
6. Check the lock-up mechanism.
- Drive in the D position, O/D gear, at steady speed (lock-up ON) of about 75 km/h (47 mph).
- Depress the accelerator pedal lightly and check that the engine speed does not change abruptly.
If there is a big jump in the engine speed, there is no lock-up.
b. 2 position test
Shift into the 2 position, depress the accelerator pedal fully and check the following points:
1. Check up-shift operation.
Check that the up-shift operation of 1->2 is taken place and that the shift point conforms to the automatic shift schedule.
HINT: There is no O/D up-shift and lock-up in the 2 position.
2. Check the engine braking.
While running in the 2 position and 2nd gear, release the accelerator pedal and check the engine braking effect.
3. Check for abnormal noise during acceleration and deceleration, and for shock at up-shift and down-shift.
c. L position test
Shift into the L position, depress the accelerator pedal fully and check the following points:
1. Check no up-shift.
While running in the L position, check that there is no up-shift to 2nd gear.
2. Check the engine braking
While running in the L position, release the accelerator pedal and check the engine braking effect.
3. Check for abnormal noise during acceleration and deceleration.
d. R position test
Shift into the R position, depress the accelerator pedal fully and check for slipping.
CAUTION: Before conducting this test ensure that the test area is free from people and obstruction.
e. P position test
Stop the vehicle on a grade (more than 50) and after shifting into the P position, release the parking brake. Then, check that the parking lock paw holds the vehicle in place.