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 full throttle valve opening positions. Check the following:




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 schedule.

NOTE:
1. There is no OD up-shift when coolant temperature is below 50 °C (122 °F).
2. There is no lock-up when the vehicle speed is 10 kph (6 mph) less than the set cruise control speed.

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

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

3. If there is no 3 OD up-shift (throttle valve opening 1/2):
- 3-OD shift valve is stuck

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

5. 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 OD -> up-shifts.

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




c. Run in the OD gear of the D range and with the lock- up in operation, 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, tire, torque converter, etc. or insufficient bending rigidity, etc., in the power train.




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 -> 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.
1. Drive in D range, O/D gear, at a steady speed (lock-up ON) of about 50 kph (31 mph).
2. 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, check on the following points.

a. Check to see that 1 -> 2, up-shift takes place and also that the shift points conform to those shown on the automatic shift schedule.

NOTE:
- To prevent overrun, the transmission shifts up into 3rd gear at around 130 kph (81 mph).
- In range 2, there will be no lock-up to 2nd gear.

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




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

3. L RANGE TEST




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

NOTE: To prevent overrun, the transmission up-shifts into 2nd gear at around 75 kph (47 mph).




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

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




c. Check for abnormal noise at 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 pawl holds the vehicle in place.