Road Test

AB60F AUTOMATIC TRANSMISSION / TRANSAXLE: 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 and reproduce the problem symptoms.

2. ROAD TEST

HINT
The ECM controls the transmission based on the vehicle condition according to the table below.

Automatic Transmission Control





(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 the 1 -> 2, 2 -> 3, 3 -> 4, 4 -> 5 and 5 -> 6 up-shifts.

(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 when accelerating with the shift lever in D.

(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 at a vehicle speed of 100 km/h (62 mph) or less 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 -> 4 down-shift and 4 -> 6 up-shift can be performed.

* 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 6th gear with the shift lever in the S6 range (at a vehicle speed of approximately 70 to 80 km/h (43 to 50 mph)), shift into the "-" position and check if the 5th gear down-shift occurs and the engine brake operates properly.

* 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.