Road Test

Taking into consideration the results of the customer problem analysis, try to reproduce the symptoms of the trouble. If the problem is that the transaxle does not up-shift, does not down-shift, or the shift point is too high or too low. conduct the following road test to confirm the automatic shift schedule and simulate the problem symptoms.

NOTICE: Perform this test at normal ATF operating temperature 55° - 80°C (131° - 176°F).


1. "D" POSITION TEST



Shift into the D position and keep the accelerator pedal constant at the full throttle valve opening position, and check the following points:
- Check up-shift operation.
- Check that 1 -> 2, 2 -> 3 and 3 -> O/D up-shift takes place, at the shift point shown in the automatic shift schedule.

AUTOMATIC SHIFT SCHEDULE - SHIFT POINT:

HINT:
- O/D Gear Up-shift Prohibition Control.
- Coolant temp. is 55°C (131°F) or less.
- If there is a 10 km/h (6 mph) difference between the set cruise control speed and vehicle speed.
- O/D main switch is pushed ON
(During the O/D OFF indicator light lights up.)

AUTOMATIC SHIFT SCHEDULE - LOCK-UP POINT:

- O/D Gear Lock-up Prohibition Control.
- Brake pedal is depressed.
- Coolant temp. is 55°C (131°F) or less.
.



- Check for shock and slip at the 1 -> 2, 2 -> 3 and 3 -> O/D up-shifts.
- Check for abnormal noises and vibration.



- Run at the D position lock-up or O/D gear and check for abnormal noises and vibration.

HINT: The check for the cause of abnormal noises and vibration must be performed very thoroughly as could also be due to loss of balance in the torque converter clutch, etc.

- Check kick-down operation.



- While running in the D position, 2nd, 3rd and O/D gears, check to see that the possible kick-down vehicle speed limits for 2 -> 1. 3 -> 2 and O/D -> 3 kick-downs conform to those indicated on the automatic shift schedule.
- Check abnormal shock and slip at kick-down.

- Check the lock-up mechanism.



(1) Drive in D position, O/D gear, at a steady speed (lock-up ON) of about 75 km/h (47 mph).
(2) Lightly depress the accelerator pedal and check that the RPM does not change abruptly.
- If there is a big jump in RPM, there is no lock-up.


2. "2" POSITION TEST



Shift into the 2 position and. while driving with the accelerator pedal held constantly at the full throttle valve opening position and check on the following points:
- Check up-shift operation
- Check to see that the 1 2 up-shift takes place and that the shift point conforms to the automatic shift schedule. (See step 1)
HINT: There is no O/D up-shift and lock-up in the 2 position.

- Check engine braking.



- While running in the 2 position and 2nd gear, release the accelerator pedal and check the engine braking effect.



- Check for abnormal noises during acceleration and deceleration, and for shock at up-shift and downshift.


3. "L" POSITION TEST
Shift into the L position and while driving with the accelerator pedal held constantly at the full throttle valve opening position, and check the following points:
- Check no up-shift.



- While running in the L position, check that there is no up-shift to 2nd gear.

- Check engine braking.



- While running in the L position, release the accelerator pedal and check the engine braking effect.



- Check for abnormal noises during acceleration and deceleration.

4. "R" POSITION TEST

CAUTION: Before conducting this test ensure that the test area is tree from personnel and obstructions.




- Shift into the R position and while starting at full throttle, check for slipping.


5. "P" POSITION TEST



- Stop the vehicle on a gradient (more than 5°) and after shifting into the P position. release the parking brake.
- Then check to see that the parking lock pawl holds the vehicle in place.