Road Test

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

1. D RANGE TEST
Shift into D range and while driving with the accelerator pedal held constant at the throttle valve full open, check on the following points:




a. 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 schedule.

EVALUATION

- If there is no 1-2 up-shift:
Governor valve is defective 1-2 shift valve stuck
- If there is no 2-3 up-shift:
2-3 shift valve stuck
- If the shift point is defective:
Throttle cable 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 in the 3rd gear of D range, check the 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.





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

EVALUATION

- If the possible kick-down vehicle speed limit is defective:
Throttle cable out-of adjustment
Throttle valve, 1-2 shift valve, 2-3 shift valve, etc. defective

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




f. While running about 60 km/h (37 mph) in the 3rd gear of D range, release your foot from the accelerator pedal and shift into L range. Then check to see if the 2-1 down-shift point conform to those indicated in the automatic shift schedule.




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.
If there is a big jump in engine rpm, there is no lockup.

3. 2 RANGE TEST




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

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




b. Check the abnormal noise during acceleration and deceleration.
c. Check the 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.

EVALUATION
- If there is no engine brake effect:
First and reverse brake is defective




c. Check the abnormal noise during acceleration and deceleration.




5. R RANGE TEST
Shift into R range and, while running at full throttle, check the 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.