Automatic Transmission System

Troubleshooting

How to perform initial learning
If you replace the automatic transmission or TCU, or if you overwrite the TCU software, be sure to initialize the learned values and perform initial learning.
1. Warm-up
Raise the ATF temperature by leaving the vehicle idling or performing city drive. Check the ATF temperature using the special tester and make sure it is between 50°C(122°F) and 120°C(248°F). If the oil temperature is outside this range, work to bring in inside the range.

CAUTION:
Do not raise the oil temperature by stalling the engine.

NOTE:
If the oil temperature is not between 50 and 120°C, initial learning cannot be performed.
Before learning, check for variable speed shock or shift shock.

2. Gear shift control learning
In D, with the throttle opening between 25 and 35%, drive until you reach 6th gear and a vehicle speed at 80km/h(50mi/h) or higher. Then, release the accelerator pedal and coast, and bring the vehicle to a stop in 60 seconds minimum. Repeat this procedure 10 times.
3. Check learning results
Check that variable speed shock and shift shock have decreased compared to conditions before learning.