Road Test

K41B CVT: CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: ROAD TEST

1. PROBLEM SYMPTOM CONFIRMATION

(a) Try to reproduce symptoms based on the result of the customer problem analysis. If the problem is that the transaxle does not change gear ratios or changes ratios at the wrong engine speed, conduct the following road test referring to the speed variation chart and attempt to duplicate the problem symptoms.

2. ROAD TEST

CAUTION:
Strictly observe posted speed limits, traffic laws, and road conditions when performing the road test.

NOTICE:
* This test must be conducted after checking and confirming that the engine is operating normally.
* Perform this test while the CVT fluid temperature is between 50 to 100°C (122 to 212°F).
* Perform the test with the A/C off.

HINT
* Lock-up control will not operate when the CVT fluid temperature is 40°C (104°F) or less and the vehicle speed is 60 km/h (37 mph) or less or when the CVT fluid temperature is 5°C (41°F) or less.
* Lock-up control will not operate when the engine coolant temperature is 30°C (86°F) or less.
* The lock-up OFF vehicle speed may vary depending on the electrical load and air conditioning and brake operations.
* Keep a constant accelerator pedal angle to maintain the specified vehicle speed.
* When kicking down with the accelerator pedal, read the engine speed immediately after the pedal is pushed down.

Speed Variation Chart





Lock-up Chart





(a) D position test

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

(1) Check up-shift operation.

Check if the gear ratio changes during normal driving (average urban driving).

(2) Check for abnormal noises and vibration.

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.

(3) Check kick-down operation.

Check if the kick-down engine speeds are as specified in the speed variation chart.

(4) Check for abnormal shock and slippage at kick-down.

(5) Check the lock-up mechanism.

(b) S position test

Move the shift lever to S and check the following:

(1) Check shift operation

* Check if the shift pattern changes in accordance with the S position pattern as specified in the speed variation chart.

* Check for appropriate engine braking force while driving at approx. 40 km/h (24 mph) with the shift lever in S.

(c) B position test

Move the shift lever to B and check the following:

* Check if the shift pattern changes in accordance with the B position pattern as specified in the speed variation chart.

* Check for appropriate engine braking force while driving at approx. 40 km/h (24 mph) with the shift lever in B.

(d) 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 the test area is free from people and obstructions.

(e) 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.