Road Test

U340E AUTOMATIC TRANSAXLE: AUTOMATIC TRANSAXLE SYSTEM: ROAD TEST

ROAD TEST

1. PROBLEM SYMPTOM CONFIRMATION
(a) 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.
2. PERFORM ROAD TEST
NOTE: Perform the test at the ATF (Automatic Transmission Fluid) temperature 50° to 80 °C (122° to 176 °F) in the normal operation.

(a) D position test
Shift into the D position, fully depress the accelerator pedal and check the following points.
(1) Check up-shift operation.
Check that 1st to 2nd, 2nd to 3rd and 3rd to 4th up-shifts take place, and that the shift points conform to the automatic shift schedule Service Data.
HINT: 4th Gear Up-shift Prohibition Control
- Engine coolant temperature is 60 °C (140 °F) or less.
- ATF temperature is 0 °C (32 °F) or less.
4th Gear Lock-up Prohibition Control
- Brake pedal is depressed.
- Accelerator pedal is released.
- Engine coolant temperature is 60 °C (140 °F) or less.
- ATF temperature is 10 °C (50 °F) or less.
(2) 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.
(3) Check for abnormal noises and vibration.
Check for abnormal noise and vibration when up-shifting from 1st to 2nd, 2nd to 3rd and 3rd to 4th while driving with the shift lever in the D position, and also check while driving in the lock-up condition.
HINT: The cause of abnormal noises and vibration must be checked very thoroughly as it could also cause loss of balance in parts, such as the differential and torque converter.
(4) Check kick-down operation.
Check the possible kick-down vehicle speeds when the 2nd to 1st, 3rd to 2nd and 4th to 3rd kick-downs take place while driving with the shift lever in the D position. Confirm that each takes place within the applicable vehicle speed range indicated in the automatic shift schedule Service Data.
(5) Check for abnormal shock and slippage during kick-down.
(6) Check the lock-up mechanism.

- Drive in the D position (4th gear) at a constant speed (lock-up ON) of approximately 37 mph (60 km/h).

- Lightly depress the accelerator pedal and check that the engine speed does not change abruptly.
HINT:
- There is no lock-up function in the 1st, 2nd and 3rd gears in the D position.
- If there is a sudden increase in engine speed, lock-up has not occurred.

(b) 3 position test
Shift into the 3 position, fully depress the accelerator pedal and check the following points:
(1) Check the transmission control switch operation.
While driving in the D position (4th gear), shift the shift lever into the 3 position, and check that the 4th to 3rd down-shift takes place.
(2) Check up-shift operation.
Check that the 1st to 2nd and 2nd to 3rd up-shifts take place, and that the shift points conform to the automatic shift schedule Service Data.
HINT: There is no 3rd to 4th up-shift in the 3 position.
(3) Check engine braking.
While driving in the 3 position and 3rd gear, release the accelerator pedal and check the engine braking effect.
(c) 2 position test
Shift into the 2 position and fully depress the accelerator pedal and check the following points.
(1) 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 Service Data.
HINT: There is no lock-up function in the 2 position.
(2) Check engine braking.
While driving in the 2 position and 2nd gear, release the accelerator pedal and check the engine braking effect.
(3) Check for abnormal noises during acceleration and deceleration, and for shock during up-shift and down-shift.
(d) L position test
Shift into the L position, fully depress the accelerator pedal and check the following points.
(1) Check that no up-shift takes place.
While driving in the L position, check that there is no up-shift to 2nd gear.
(2) Check engine braking.
While driving in the L position, release the accelerator pedal and check the engine braking effect.
(3) Check for abnormal noises during acceleration and deceleration.
(e) R position test
Shift into the R position, fully depress the accelerator pedal and check for slippage.
CAUTION: Before conducting this test, ensure that the test area is free from people and obstructions.

(f) P position test
Stop the vehicle on a slope (more than 5°), shift into the P position and release the parking brake. Check that the vehicle does not move.