Road Test

AB60F AUTOMATIC TRANSMISSION / TRANSAXLE: AUTOMATIC TRANSMISSION 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 transmission 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. ROAD TEST
NOTE: Perform the test at the normal operating ATF temperature of 50 to 80°C (122 to 176°F).

(a) D position test
Move the shift lever to D, fully depress the accelerator pedal and check the following points.
(1) Check up-shift operation.
Check that the 1 -> 2, 2 -> 3, 3 -> 4, 4 -> 5 and 5 -> 6 up-shifts take place at the shift point shown in the automatic shift schedule Pressure, Vacuum and Temperature Specifications.
HINT: 6th Gear Up-shift Prohibition Control
- The engine coolant temperature is below 60°C (140°F) and the vehicle speed is less than 55 km/h (34 mph).
5th Gear Up-shift Prohibition Control
- The engine coolant temperature is below 55°C (131°F) and the vehicle speed is less than 51 km/h (32 mph).
4th Gear Up-shift Prohibition Control
- The engine coolant temperature is below 47°C (117°F) and the vehicle speed is less than 49 km/h (30 mph).
Lock-up Prohibition Control
- The brake pedal is depressed.
- The accelerator pedal is released.
- The engine coolant temperature is below 60°C (140°F).
- Lock-up in 5th or 6th gear is not engaged when the shift lever is in the S4 range.
- Lock-up in 6th gear is not engaged when the shift lever is in the S5 range.
- Lock-up in 3rd or 2nd gear is engaged when the ATF temperature is higher than 125°C (257°F).
- Lock-up control during accelerating is not engaged when the shift lever is in the S1 range, or in 1st gear.
(2) Check for shift shock and slippage.
Check for shock and slippage at the 1 -> 2, 2 -> 3, 3 -> 4, 4 -> 5 and 5 -> 6 up-shifts.
(3) Check for abnormal noise and vibration.
Check for abnormal noise and vibration when up-shifting from 1 -> 2, 2 -> 3, 3 -> 4, 4 -> 5 and 5 -> 6 while driving with the shift lever in D, and also check while driving in the lock-up condition.
HINT: 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.
(4) Check kick-down operation.
Check the vehicle speeds when the 2 -> 1, 3 -> 2, 4 -> 3, 5 -> 4 and 6 -> 5 kick-downs take place while driving with the shift lever in D. Confirm that each speed is within the applicable vehicle speed range indicated in the automatic shift schedule Pressure, Vacuum and Temperature Specifications.
(5) Check for abnormal shock and slippage at each kick-down.
(6) Check the lock-up mechanism.

- Drive in 5th gear with the shift lever in D at a steady speed (lock-up ON).
- Lightly depress the accelerator pedal and check that the engine speed does not change abruptly.
HINT: If there is a sudden increase in engine speed, there is no lock-up.

(b) S position test
(1) Check shift operation.

- While driving the vehicle in 6th gear with the shift lever in D, move the shift lever to S and return to D. Check that the gear change 6 -> 5 down-shift and 5 -> 6 up-shift can be performed.
HINT:
- When vehicle speed is 145 km/h (90 mph) or more:
6 -> 5 down-shift and 5 -> 6 up-shift
- When vehicle speed is less than 145 km/h (90 mph):
6 -> 4 down-shift and 4 -> 6 up-shift

- With the shift lever in S (while the vehicle is stopped), shift into the "+" position to check that the shift position on the combination meter changes as follows: 1 -> 2, 2 -> 3, 3 -> 4, 4 -> 5 and 5 -> 6.
- While driving the vehicle in 5th gear with the shift lever in the S5 range (at a vehicle speed of approximately 55 to 65 km/h (34 to 40 mph)), shift into the "-" position and check if the 4th gear down-shift occurs and the engine brake operates properly.
- While driving the vehicle in 4th gear with the shift lever in the S4 range (at a vehicle speed of approximately 30 to 40 km/h (19 to 25 mph)), shift into the "-" position and check if the 3rd gear down-shift occurs and the engine brake operates properly.
- While driving the vehicle in 3rd gear with the shift lever in the S3 range (at a vehicle speed of approximately 20 to 30 km/h (12 to 19 mph)), shift into the "-" position and check if the 2nd gear down-shift occurs and the engine brake operates properly.
- While driving the vehicle in 2nd gear with the shift lever in the S2 range (at a vehicle speed of approximately 10 to 20 km/h (6 to 12 mph)), shift into the "-" position and check if the 1st gear down-shift occurs and the engine brake operates properly.
HINT: Manual shift (S range) is prohibited under either of the following conditions:
- Down-shifting that causes engine overrun.
- The driver repeatedly down-shifts (down-shifting to 1st gear may not be performed).

(c) R position test
Move the shift lever to R, 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 of people and obstructions.

(d) P position test
Stop the vehicle on an incline (more than 5°) and after moving the shift lever to P, release the parking brake. Then, check that the parking lock pawl holds the vehicle in place.