Road Test

AA80F AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: 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 or shift down, or that the shift point is too high or too low, conduct the following road test referring to the automatic shift schedule and try to reproduce the problem symptoms.

2. ROAD TEST

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

(a) D position test (NORM and PWR pattern)

Move the shift lever to D and fully depress the accelerator pedal. Check the following:

(1) Check up-shift operation.

Check that the 1 -> 2, 2 -> 3, 3 -> 4, 4 -> 5, 5 -> 6, 6 -> 7 and 7 -> 8 up-shifts take place at the shift points shown in the automatic shift schedule AA80F Automatic Transmission.

HINT
Lock-up Prohibition Control

* Brake pedal is depressed.
* Accelerator pedal is released.
* Engine coolant temperature is 60°C (140°F) or less.
(2) Check for shift shock and slip.

Check for shock and slip at the 1 -> 2, 2 -> 3, 3 -> 4, 4 -> 5, 5 -> 6, 6 -> 7 and 7 -> 8 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, 5 -> 6, 6 -> 7 and 7 -> 8 while driving with the shift lever in D, and check while driving in the lock-up condition.

NOTICE:
If abnormal noise and/or vibration occur, conduct a thorough check of the cause. Failure to repair the problem may lead to subsequent problems in the differential, torque converter, etc.

(4) Check kick-down operation.

While driving the vehicle in 2nd, 3rd, 4th, 5th, 6th, 7th and 8th gear with the shift lever in D, check that the possible kick-down vehicle speed limits for the 2 -> 1, 3 -> 2, 4 -> 3, 5 -> 4, 6 -> 5, 7 -> 6 and 8 -> 7 kick-downs conform to those indicated in the automatic shift schedule AA80F Automatic Transmission.

(5) Check for abnormal shock and slip at kick-down.

(6) Check the lock-up mechanism.

* Drive the vehicle in 6th, 7th or 8th gear with the shift lever in D or the S8 range selected. Maintain a steady speed (lock-up on).

* There is no 8th gear lock-up when the range is 7.

* There is no 7th or 8th gear lock-up when the range is 6.

* There is no lock-up when the range is 1, 2, 3, 4 or 5, or when the shift lever is in D and the transmission is in any gear from 1st to 5th.

* 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 (when the vehicle is stopped).

* When the engine switch is on (IG) and the shift lever is moved from D to S, check that the shift range display in the combination meter indicates "4".

* After performing the operation above, check that the shift range display decreases or increases by 1 when the shift lever is moved to "-" or "+", respectively.

HINT
* If the shift lever is held in "+" for more than 1 second, the shift range display will change to 8.
* If the shift range display is 6, 7 or 8, moving the shift lever to "-" will change the display to 4.
(2) Check shift operation (when the vehicle is being driven).

* Initial shift range when moving the shift lever from D to S:

* Depending on the vehicle speed, the initial shift range will be as shown in the table below when moving the shift lever from D to S.





Example:

* When the vehicle is being driven at approximately 0 to 64 km/h (0 to 40 mph) and the shift lever is moved from D to S, the shift range display in the combination meter indicates "4".

* When the vehicle is being driven at approximately 57 to 88 km/h (35 to 55 mph) and the shift lever is moved from D to S, the shift range display in the combination meter indicates "5".

NOTICE:
*: At certain speeds, differences in tire sizes, etc. cause the "Initial shift range when moving shift lever to S" value to have 2 possibilities.

* Due to the vehicle speed related "engine over-revving prevention" which is used to prevent over-revving of the engine when the shift lever is moved to "-" when driving in S mode, the shift range will not decrease as shown when the actual vehicle speed is above the range shown.





NOTICE:
*: Differences in tire sizes, etc. cause the "Vehicle speed at which shift range decrease is permitted" to have a range, as shown above.

* To prevent over-revving when driving with the shift lever in S, if the vehicle speed is within the vehicle speeds shown in the table below, the gear will increase.





NOTICE:
*: Differences in tire sizes, etc. cause the "Vehicle Speed Necessary for Shift Range Increase" to have a range, as shown above.

* When moving the shift lever to "-", the resulting range and gear are determined based on the range and gear prior to moving the shift lever.





Example:

* When moving the shift lever to "-" while the shift range is 6 and in 6th gear, the shift range changes to 5 and the gear to 5th.

* When moving the shift lever to "-" while the shift range is 6 and in 3rd gear, the shift range changes to 4, but the gear remains in 3rd.

* When moving the shift lever to "-" while the shift range is 4 and in 4th gear, the shift range changes to 3 and the gear to 3rd.

* When moving the shift lever to "-" while the shift range is 4 and in 3rd gear, the shift range changes to 3, but the gear remains in 3rd.

(c) R position test

Move the shift lever to R and lightly depress the accelerator pedal. Check that the vehicle moves backward without any abnormal noise or vibration.

CAUTION:
Before conducting this test, ensure that no people or obstacles are in the test area.

(d) P position test

Stop the vehicle on an incline (more than 5°). Then move the shift lever to P and release the parking brake. Check that the parking lock pawl holds the vehicle in place.