Vehicles equipped with A/T, anti-lock brake/vehicle skid control or memory computers may require a computer relearn procedure after components are replaced or the vehicle battery is disconnected. Vehicle computers memorize and store vehicle information and operation selections. When the vehicle battery is disconnected, vehicle computer memory may be lost, requiring relearning or resetting. Depending on the vehicle and how it is equipped, the following memories may exist:

Radio presets.
Clock.
Door key lock entry custom features.

These do not affect vehicle operation. For systems that do not affect operation, see appropriate article for relearn procedures. Other computer relearn procedures are required for vehicle or system operation. These may include:

Initial control unit programming.
Traction and vehicle skid control yaw rate and deceleration sensor initializing. See Fig 1-Fig 2 .
Electronic controlled automatic transmission. See Fig 3.
Multiplex communication (xB model only).

Fig 1: Calibrating Yaw Rate and Deceleration Sensors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Body Controls

Use the Manual With the Right Hardware

When to See a Mechanic

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