Problem Symptom Confirmation (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 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.

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




1. D POSITION TEST
Shift into the D position and keep the accelerator pedal constant at the full throttle valve opening position, and check the following points:
- 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.

HINTS:
- O/D Gear Up-shift Prohibition Control.
- Coolant temp. is 55°C (131°F) or less
- If there is a 10 km/h (6 mph) difference between the set cruise control speed and vehicle speed.
- 0/D main switch is pushed ON
(During the O/D OFF indicator light lights up.)

- O/D Gear Lock-up Prohibition Control.
- Brake pedal is depressed.
- Coolant temp. is 55°C (131°F) or less.




- Check for shift shock and slip.
- Check for shock and slip at the 1-2, 2-3 and 3-O/D up-shifts.




- 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.




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




- Check the lock-up mechanism.
- Drive in D position, O/D gear, at a steady speed (lock-up ON) of about 70 km/h (43 mph).
- 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. 2 POSITION TEST
Shift into the 2 position and, while driving with the accelerator pedal held constantly at the full throttle valve opening position and check on the following points:
- Check up-shift operation
- Check to see that the 12 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.




- Check engine braking.
- While running in the 2 position and 2nd gear, release the accelerator pedal and check the engine braking effect.




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




3. L POSITION TEST
Shift into the L position and while driving with the accelerator pedal held constantly at the full throttle valve opening position, and check the following points:
- Check no up-shift.
- While running in the L position, check that there is no up-shift to 2nd gear.




- Check engine braking.
- While running in the L position, release the accelerator pedal and check the engine braking effect.




- Check for abnormal noises during acceleration and deceleration.




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




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




AUTOMATIC SHIFT SCHEDULE
SHIFT POINT
NORM Mode




PWR Mode




LOCK-UP POINT
NORM Mode




PWR Mode

HINTS:
- There is no lock-up in the 2 and L positions.
- Lock-up will be released regardless of the lock-up pattern in the following cases.
- When the throttle valve is completely closed.
- When the brake light switch is ON.
- Shift up to 3rd will not occur when the engine coolant temp. is below 35°C (95°F) and the vehicle speed is below 40 km/h (25 mph).
- Shift-up to O/D will not occur when the engine coolant temp. is below 60°C (140°F) and the vehicle speed is below 63 km/h (39 mph).
- When the vehicle speed drops to 10 km/h (6 mph) or more below the cruise control set vehicle speed, shift down from O/D to 3rd occurs.
- The shift point is at the same vehicle speed for both NORM and PWR when the throttle valve is fully open or closed. However, at half-throttle, the shift points are different for NORM and PWR.