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 transaxle does not up-shift, does not downshift, or the shift point is too high or too low, conduct the following road test for the automatic shift schedule and simulate the problem symptoms.

ROAD TEST
NOTICE: 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 keep the accelerator pedal at the full throttle valve opening position. Check the following:
- Check that 1 - 2, 2 - 3 and 3 - O/D up-shift takes place, at the shift point shown in the automatic shift schedule. Conduct the test for both Normal and Power patterns.

HINT:
- There is no O/D up-shift and lock-up when the engine coolant temperature is below 60°C (140°F).
- When the engine coolant temperature is below 60°C (140°F), the shift point is lower than specified in the automatic shift schedule.




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




- Check for abnormal noise and vibration at the D range lockup 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 drive shaft, tire, torque converter clutch, etc.




- Check kickdown operation while running in the D range, 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 for abnormal shock and slip at kick-down.




- Check for the lock-up mechanism.
- Drive in D range, O/D gear, at a steady speed (lockup ON) of about 56 km/h (35 mph) in "NORM" pattern or 65 km/h (40 mph) in "PWR" pattern.
- 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 and check on the following points.
- Check up-shift operation, check to see that the 1 - 2 upshift takes place and that the shift point conforms to the automatic shift schedule.

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




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




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




3. L RANGE TEST
Shift into the L range 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 the following points:
- Check no up-shift while running in the L range, check that there is no up-shift to 2nd gear.




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




- Check for abnormal noise during 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 50) 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.







AUTOMATIC SHIFT SCHEDULE
HINT:
- Lock-up will not occur in 2nd gear.
- There is no lock-up in the 2 and L ranges.
- In the following cases, the lock-up will be released regardless of the lock-up pattern.
- When the throttle is completely closed.
- When the brake light switch is ON.