Road Test

U660E AUTOMATIC TRANSAXLE: AUTOMATIC TRANSAXLE 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 transaxle does not shift up or down, or the shift point is too high or too low, conduct the following road test referring to the automatic shift schedule and attempt to duplicate the problem symptoms.

2. ROAD TEST

NOTICE:
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 and check the following:

(1) Check up-shift operation.

Check that 1 to 2, 2 to 3, 3 to 4, 4 to 5 and 5 to 6 up-shifts take place, and that the shift points conform to the automatic shift schedule Service Data.

HINT
6th Gear Up-shift Prohibition Control

* ATF temperature is 0°C (32°F) or less.
5th Gear Up-shift Prohibition Control

* ATF temperature is 0°C (32°F) or less.
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 to 2, 2 to 3, 3 to 4, 4 to 5 and 5 to 6th up-shifts.

(3) Check for abnormal noise and vibration.

Check for abnormal noise and vibration when up-shifting from 1 to 2, 2 to 3, 3 to 4, 4 to 5 and 5 to 6 while driving with the shift lever in the D position, and also 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 for abnormal shock and slip at kick-down.

(5) Check the lock-up mechanism.

* Drive the vehicle with the shift lever in the D position (6th gear) at a steady speed (lock-up ON).

* Lightly depress the accelerator pedal and check that the engine speed does not change abruptly.

HINT
* There is no lock-up in the 1st, 2nd, 3rd, 4th and 5th gear.
* If there is a jump in engine speed, this indicates that lock-up is not operating.
(b) S position test

Shift to the S position, depress the accelerator pedal and check the following:

(1) Check shift operation.

* With the shift lever in the S position (while the vehicle is stopped), shift into the "+" position to check that the shift position on the combination meter changes as follows: 1 to 2, 2 to 3, 3 to 4, 4 to 5 and 5 to 6.

* While driving in the 5 (S) position and 5th gear (at a vehicle speed of approximately 34 to 40 mph (55 to 65 km/h), shift into the "-" position and check if the 4th gear down-shift occurs and proper engine braking occurs.

* While driving in the 4 (S) position and 4th gear (at a vehicle speed of approximately 19 to 25 mph (30 to 40 km/h), shift into the "-" position and check if the 3rd gear down-shift occurs and proper engine braking occurs.

* While driving in the 3 (S) position and 3rd gear (at a vehicle speed of approximately 12 to 19 mph (20 to 30 km/h), shift into the "-" position and check if the 2nd gear down-shift occurs and proper engine braking occurs.

* While driving in the 2 (S) position and 2nd gear (at a vehicle speed of approximately 6 to 12 mph (10 to 20 km/h), shift into the "-" position and check if the 1st gear down-shift occurs and proper engine braking occurs.

HINT
Manual shift (S position) is prohibited under either of the following conditions:

* Down-shifting may cause engine overrun.
* The driver continuously down-shifts. (Down-shifting to 1st gear may not be performed.)
(c) 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.

(d) 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.