ETS (Electronic Throttle System): Description

ETS (Electronic Throttle System) consists of: Input signals from Accelerator Position Sensor (APS), Throttle Position Sensor (TPS), Ignition Switch and Serial Communication Line, an ETS Motor and a Limp-Home Valve to control the idle speed, throttle valve and TCS by using only one motor.

Fig 1: Identifying ETS System Components

Courtesy of KIA MOTORS AMERICA, INC.

In ECU and ETS the signals from Accelerator Position Sensor (APS) and Throttle Position Sensor (TPS) are the most important. They have two circuits in sensor module, one is flowed to ECU and the other is flowed to ETS. ECU calculates the throttle target value with the signals from APS #2 (MAIN) and TPS #2 (SUB) and the ETS control module controls the ETS motor with the signals from APS #1 (SUB) and TPS #1 (MAIN).

Fig 2: Identifying APS

Courtesy of KIA MOTORS AMERICA, INC.