Road Test

ROAD TEST

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






1. D RANGE TEST IN NORM AND PWR PATTERN RANGES.
Shift into the D range and hold the accelerator pedal constant at the full throttle valve opening position.

A. 1 -> 2, 2 -> 3, 3 -> OD , and lock-up up-shifts should take place, and shift points should conform to those shown in the automatic shift diagram.

NOTE:
- There is no O/D up-shift and lock-up when coolant temperature is below 60°C (140°F).
- When the coolant temp. is below 60°C (140°F), the shift point is lower than specified in the automatic shift schedule.






1A. EVALUATION.
a. If there is no 1 -> 2 up-shift:
- No. 2 solenoid is stuck.
- 1-2 shift valve is stuck.

b. If there is no 2 -> 3 up-shift:
- No. 1 solenoid is stuck.
- 2-3 shift valve is stuck.

c. If there is no 3 -> O/D up-shift:
- 3 -> 4 shift valve is stuck.

d. If the shift point is defective:
- Throttle valve, 1-2 shift valve, 2-3 shift valve, 3-OD shift valve etc., are defective.

e. If the lock-up is defective:
- No. 3 solenoid is stuck.
- Lock-up relay valve is stuck.


B. In the same manner, check the shock and the slip at 1 -> 2, 2 -> 3 and 3 -> O/D up-shifts.

1B. EVALUATION.
If the shock is severe:
- Line pressure is too high.
- Accumulator is defective.
- Check ball is defective.






C. Run at the D range lock-up or O/D gear and check for abnormal noise and vibration.

NOTE: The check for the cause of abnormal noise and vibration must be make with extreme care as it cold also be due to loss of balance in the drive shaft, tire, torque converter, etc.






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






F. Check for the lock-up mechanism.
- Drive in D range, O/D gear, at a steady speed (lock-up "ON") of about 75 km/h (47 mph).
- Lightly depress the accelerator pedal and check that the engine rpm does not change abruptly.

If there is a big jump in engine rpm, there is no lock-up.

2. 2 RANGE TEST.
Shift into the 2 range and, while driving with the accelerator pedal held constantly at the full throttle valve opening position, push in one of the pattern selectors and check on the following points.

A. Check to see that the 1 -> 2 up-shift takes place and that the shift point conforms to it shown on the automatic shift schedule.






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






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






C. Check for abnormal noise at acceleration and deceleration, and for shock at up-shift and down-shift.


3. L RANGE TEST.






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






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

3A. EVALUATION.
If there is no engine braking effect:
- First and reverse brake is defective.






C. Check for abnormal noise during acceleration and deceleration.






4. R RANGE TEST.
Shift into the R range and, while starting at full throttle, check for slipping.






5. P RANGE TEST.
Stop the vehicle on a gradient (more than 5°) and after shifting into the P range, release the parking brake. Then check to see that the parking lock paw holds the vehicle in place.