Road Test

ROAD TEST (A131L/4A-C)

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

1. D RANGE TEST.
Shift into the D range, and while driving with the accelerator pedal held constant at specified point (50% and 100%) check on the following points.






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






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

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

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

B. In the same manner, check the shock and the slip at 1 -> 2 and 2 -> 3 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, 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 drive shaft, differential, tire, torque converter, etc. or bending rigidity, etc., in the powertrain.






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






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

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

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






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






2. INSPECT LOCK-UP MECHANISM.
A. Drive in D range, at a steady speed (Lock-up "ON") of about 65 km/h (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 down-shift.

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 R range and, while starting at full throttle, check for slipping.