Road Test

ROAD TEST

CAUTION: Perform this test at normal fluid temperature (50 - 80°C or 122 - 176°F).

Automatic Shift Diagram:

1. D RANGE TEST



Shift into D range and while driving with the accelerator pedal held constant at a specified point (throttle valve opening 50% and 100%), check on the following points:

a. At each of the above throttle openings, check to see that the 1-2 and 2-3 up-shifts take place and also that the shift points conform to those shown in the automatic shift diagram.

EVALUATION
1. If there is no 1-2 up-shift:
- Governor valve is defective
- 1-2 shift valve stuck

2. If there is no 2-3 up-shift:
- 2-3 shift valve stuck

3. If the shift point is defective:
- Throttle link out-of-adjustment
- Throttle valve, 1-2 shift valve, 2-3 shift valve, etc. defective.




b. In the same manner, check the shock and the slip at 1-2 and 2-3 up-shifts.

EVALUATION
If the shock is severe:
- Line pressure is too high
- Accumulator is defective
- Check ball is defective




c. Run at D range, 3rd gear and check for abnormal noise and vibration.

NOTE: Check for cause of abnormal noise and vibration must be made with extreme care as they could also be due to unbalance in the drive shaft differential, tires, torque converter, etc. or insufficient bending rigidity, etc., in the power train.




d. While running in D range, 2nd and 3rd gears, check to see that the possible kick-down vehicle speed limits for the 2-1, 3-1 and 3-2 kick-downs conform to those indicated in the automatic shift diagram.

e. Check for abnormal shock and slip at kick-down.




f. While running in D range, 3rd gear shift to 2 and L ranges and check the engine braking effect in each of these ranges.

EVALUATION
1. If there is no engine braking effect at 2 range:
- Second coast brake is defective

2. If there is no engine braking effect at L range:
- First and reverse is defective





g. While running in D range, release your foot from the accelerator pedal and shift into L range. Then check to see if the 3-2 and 2-1 down-shift points conform to those indicated in the automatic shift diagram.

2. INSPECT LOCK-UP MECHANISM



a. Drive in D range, at a steady speed (Lock-up ON) of about 65 kmph (40 mph).
b. Lightly depress the accelerator pedal and check that the engine speed does not change abruptly.


3. 2 RANGE TEST



a. Shift to 2 range and run with the throttle valve opening at 50% and 100% respectively. Then check the 1 - 2 up-shift points at each of the throttle valve openings to see that it conforms to those indicated on the automatic shift diagram.




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




c. Perform a kick-down from 2 range and check the possible 2-1 kick-down vehicle speed limit to see if it conforms to that indicated on the automatic shift diagram.




d. Check for abnormal noise at acceleration and deceleration, and for shock at up-shift and downshift.


4. L RANGE TEST



a. While running in L range, check to see that there is no up-shift to 2nd gear.




b. While running in L range, release the accelerator pedal and check the engine braking effect.




c. Check for abnormal noise during acceleration and deceleration.

5. R RANGE TEST



Shift into A range and, while running at full throttle, check for slipping

6. P RANGE TEST



Stop the vehicle on a gradient (more than 9%) and, after shifting into P range, release the parking brake. Then check to see that the parking lock pawl prevents the vehicle from moving.


OPERATING MECHANISM FOR EACH GEAR