Road Test

PROBLEM SYMPTOM CONFIRMATION

Taking into consideration the results of the customer problem analysis, try to reproduce the symptoms of the trouble. If the problem is that the transmission does not up-shift, does not down-shift, or the shift point is too high or too low, conduct the following road test to confirm the automatic shift schedule and simulate the problem symptoms.

ROAD TEST

NOTICE: Do the test at normal ATF operating temperature 50 - 80°C (122 - 176°F).

1. D POSITION TEST (NORM PATTERN)
Shift into the D position and keep the accelerator pedal constant at the full throttle valve opening position, and check the following points:
(a) Check up-shift operation.
Check that 1 -> 2, 2 -> 3 and 3 -> O/D up-shift takes place, at the shift point shown in the automatic shift schedule.

HINT:
(1) O/D Gear Up-shift Prohibition Control.
- Coolant temperature is 60°C (140°F) or less.
- If there is a 10 km/h (6 mph) difference between the set cruise control speed and vehicle speed.
- O/D main switch is pushed ON. (During O/D OFF, indicator light lights up.)
(2) O/D Gear Lock-up Prohibition Control.
- Brake pedal is depressed.
- Coolant temperature is 60°C (140°F) or less.

(b) Check for shift shock and slip.
Check for shock and slip at the 1 -> 2, 2 -> 3 and 3 -> O/D up-shifts.
(c) Check for abnormal noise and vibration.
Run at the D position lock-up or O/D gear and check for abnormal noise and vibration.

HINT: The check for the cause of abnormal noise and vibration must be performed very thoroughly as it could also be due to loss of balance in the torque converter clutch, etc.

(d) Check kick-down operation.
While running in the D position, 2nd, 3rd and O/D gears, check to see that the possible kick-down vehicle speed limits for 2 -> 1, 3 -> 2 and O/D -> 3 kick-downs conform to those indicated on the automatic shift schedule.
(e) Check for abnormal shock and slip at kick-down.
Check the lock-up mechanism.
(1) Drive in D position of O/D gear, at a steady speed (lock-up ON) of about 59 km/h (37 mph).
(2) Lightly depress the accelerator pedal and check that the RPM does not change abruptly. If there is a big jump in RPM, there is no lock-up.

2. D POSITION TEST (MANU PATTERN)
Shift into the D position and hold the accelerator pedal constant at the full throttle valve opening position, and check the following points:
(a) Check up-shift operation.
2 -> 3 and 3 -> O/D up shifts should take place, and shift points should conform to those shown in the automatic shift schedule.

HINT:
- O/D up-shift or lock-up will not occur when the engine coolant temperature is below 60°C (140°F) and speed is under 60 km/h (37 mph), or if there is a 10km/h (6mph) difference between the set cruise control speed.
- 3rd up-shift or lock-up will not occur when engine coolant temperature is 35°C (95°F) and speed is under 40 km/h (25 mph).

(b) Check for shift shock and slip.
In the same manner, check the shock slip at the 2 -> 3 and 3 -> O/D up-shifts.
(c) Check for abnormal noise and vibration.
Run at the D position lock-up or O/D gear and check for abnormal noise and vibration.

HINT: The check for the cause of abnormal noise and vibration must be made with extreme care as it could also be due to loss of balance in the propeller shaft, differential, torque converter clutch, etc.

(d) Check kick-down operation.
While running in the D position, 2nd, 3rd and O/D gears, check to see that the possible kick-down vehicle speed limits for 3 -> 2 and O/D -> 3 kick-downs conform to those indicated on the automatic shift schedule.
(e) Check for abnormal shock slip at kick-down.
Check the lock-up mechanism.
(1) Drive in D position, O/D gear, at a steady speed (lock-up ON) of about 195 km/h (121 mph).
(2) Lightly depress the accelerator pedal and check that the engine RPM does not change abruptly.
If there is big jump in the engine RPM there is no lock-up.

3. 2 POSITION TEST (NORM PATTERN)
Shift into the 2 position and, while driving with the accelerator pedal held constantly at the full throttle valve opening position, check on the following points:
(a) Check up-shift operation.
Check to see that the 1 -> 2 up-shift takes place and that the shift point conforms to the automatic shift schedule.

HINT: There is no O/D up-shift and lock-up in the 2 position.

(b) Check engine braking.
While running in the 2nd gear of the 2 position, 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.

4. 2 POSITION TEST (MANU PATTERN)
Shift into the 2 position 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 these points:
(a) Check no up-shift.
While running in the 2 position, check to see that there is no up-shift to 3rd gear.
(b) Check engine braking.
While running in the 2nd gear of the 2 position, release the accelerator pedal and check the engine braking effect.
(c) Check for abnormal noise during acceleration and deceleration.

5. L POSITION TEST
Shift into the L position and while driving with the accelerator pedal held constantly at the full throttle valve opening position, check these points:
(a) Check no up-shift.
While running in the L position, check that there is no up-shift to 2nd gear.
(b) Check engine braking
While running in the L position, release the accelerator pedal and check the engine braking effect.
(c) Check for abnormal noise during acceleration and deceleration.

6. R POSITION TEST
Shift into the R position and while starting at full throttle, check for slipping.

CAUTION: Before conducting this test ensure that the test area is free from personnel and obstruction.

7. P POSITION TEST
Stop the vehicle on a gradient (more than 50) and after shifting into the P position, release the parking brake.
Then check to see that the parking lock paw holds the vehicle in place.