Toyota VIOS automatically accelerates without turning on the air conditioning engine.

Toyota VIOS can't start the air conditioning engine to accelerate automatically because of electronic throttle failure and air filter blockage.

1. electronic throttle failure: the electronic throttle is responsible for controlling air to enter the engine. If it fails, it may lead to abnormal engine acceleration.

2. The air filter is blocked: If the air filter is blocked, air will not enter the engine normally, thus affecting the normal operation of the engine and causing abnormal acceleration.