COMPLEX electronics govern handling-related systems such as ABS, EBD and traction control for Zafira. Electronics also help improve reliability, emissions levels and driveability with their role in the vehicle's Electronic Throttle Control (or drive-by-wire throttle). ETC is operated by an electrical signal transferred from the accelerator, via the engine's electronic control unit, to the air inlet throttle mechanism. The system is designed to enhance driveability by allowing more precise control of throttle movements, lower exhaust emissions and give reliability gains through the minimisation of mechanical wear.