Electronic Throttle Control System Description
Overview
The electronic throttle control system (ETCS) opens and closes the throttle valve by electronic control. This system consists of a throttle actuator built into the throttle body, throttle valve and throttle position (TP) sensor A/B, accelerator pedal position (APP) sensor A/B, ETCS driver built into the powertrain control module (PCM).
ETCS is a system that opens and closes the throttle valve electronically, it has various functions such as:
- Idle Control Function
- Accelerator Control Function
- Fail-Safe Function
- Relationship Action with Other Systems
Control
When the accelerator pedal is operated, APP sensors are driven allowing the accelerator pedal position to be detected. The accelerator pedal position is delivered to the PCM, and the PCM drives the throttle actuator in the throttle body based on the delivered throttle pedal position to open or close the throttle valve.Throttle position is detected by the TP sensors in the throttle body and delivered to the PCM. The PCM drives the throttle actuator to control the throttle position during idling, during various system control, and when necessary, as well as based on the signals from the APP sensors.
For locations of each component on vehicle, refer to Component Location Index
- PCM, APP SENSOR, THROTTLE BODY, ACCELERATOR PEDAL MODULE
- UNDER-HOOD FUSE/RELAY BOX (PGM-FI MAIN RELAY 1, ETCS CONTROL RELAY)
Change of ETCS system control (with ECON)
The ECON ON mode softens throttle valve control to reduce fuel consumption when the accelerator pedal is aggressively depressed. Also, throttle opening becomes slow in comparison with the ECON OFF mode. However, if the accelerator pedal is depressed more than a certain level, control automatically becomes equivalent to the ECON OFF mode in order to ensure the acceleration.