PROBLEM SYMPTOM CONFIRMATION
Based on the result of the customer problem analysis, try to reproduce the symptoms. If the problem is that the transaxle does not shift up, shift down, or the shift point is too high or too low, conduct the following road test referring to the automatic shift schedule and simulate the problem symptoms.
ROAD TEST
Note
Perform the test at the normal operating ATF (Automatic Transmission Fluid) temperature: 50 to 80°C (122 to 176°F).
D position test:
Shift into the D position and fully depress the accelerator pedal and check the following points.
Check up-shift operation.
Check that 1st to 2nd, 2nd to 3rd and 3rd to 4th (O/D) up-shifts take place, and that the shift points conform to the automatic shift schedule Click here.
Tech Tips
4th (O/D) Gear Up-shift Prohibition Control
Engine coolant temperature is 20°C (68°F) or less and vehicle speed is at 10 km/h (6 mph) or less. (1KD-FTV)
Engine coolant temperature is 50°C (122°F) or less and vehicle speed is at 70 km/h (43 mph) or less. (2KD-FTV)
3rd Gear Up-shift Prohibition Control
Engine coolant temperature is 50°C (122°F) or less and vehicle speed is at 55km/h (34 mph) or less. (2KD-FTV)
4th (O/D) Gear Lock-up Prohibition Control
Brake pedal is depressed.
Accelerator pedal is released.
Engine coolant temperature is 55°C (131°F) or less. (1KD-FTV)
Engine coolant temperature is 60°C (140°F) or less. (2KD-FTV)
When the 2nd start switch is ON, there are no 1st to 2nd up-shift and 2nd to 1st down-shift.
Check for shift shock and slippage.
Check for shock and slippage when up-shifting from 1st to 2nd, 2nd to 3rd and 3rd to 4th (O/D).
Check for abnormal noise and vibration.
Check for abnormal noise and vibration when up-shifting from 1st to 2nd, 2nd to 3rd and 3rd to 4th (O/D) while driving with the shift lever in the D position, and also check while driving in the lock-up condition.
Tech Tips
The check for the cause of abnormal noise and vibration must be done thoroughly as it could also be due to loss of balance in the differential, torque converter clutch, etc.
Check kick-down operation.
Check vehicle speeds when the 2nd to 1st, 3rd to 2nd and 4th (O/D) to 3rd kick-downs take place while driving with the shift lever in the D position. Confirm that each speed is within the applicable vehicle speed range indicated in the automatic shift schedule Click here.
Check abnormal shock and slippage at kick-down.
Check the lock-up mechanism.
Drive in the D position (4th (O/D) gear), at a steady speed (lock-up ON).
Lightly depress the accelerator pedal and check that the engine speed does not change abruptly.
Tech Tips
If there is a big jump in engine speed, there is no lock-up.
3 position test:
Shift into the 3 position and fully depress the accelerator pedal and check the following points.
Check up-shift operation.
Check that the 1st to 2nd and 2nd to 3rd upshifts take place, and that the shift points conform to the automatic shift schedule Click here.
Tech Tips
There is no 4th (O/D) up-shift in the 3 position.
When the 2nd start switch is ON, there are no 1st to 2nd up-shift and 2nd to 1st down-shift.
Check engine braking.
While running in the 3 position and 3rd gear, release the accelerator pedal and check the engine braking effect.
Check for abnormal noises during acceleration and deceleration, and for shock at up-shift and down-shift.
2 position test:
Shift into the 2 position and fully depress the accelerator pedal and check the following points.
Check up-shift operation.
Check that the 1st to 2nd up-shift takes place, and that the shift point conforms to the automatic shift schedule Click here.
Tech Tips
There is no 3rd up-shift and lock-up in the 2 position.
When the 2nd start switch is ON, there are no 1st to 2nd up-shift and 2nd to 1st down-shift.
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 noises during acceleration and deceleration, and for shock at up-shift and down-shift.
L position test:
Shift into the L position and fully depress the accelerator pedal 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.
R position test:
Shift into the R position, lightly depress the accelerator pedal, and check that the vehicle moves backward without any abnormal noise or vibration.
CAUTION:
Before conducting this test, ensure that the test area is free from people and obstruction.
P position test:
Stop the vehicle on a grade (more than 5°) and after shifting into the P position, release the parking brake. Then, check that the parking lock pawl holds the vehicle in place.