The Electronic Throttle Control(ETC) system is made of the components throttle body, Throttle Position Sensor(TPS)1&2 and Accelerator Position Sensor(APS) 1&2. The throttle body contains the actuator, the throttle plate and the throttle position sensor (potentiometer), which are integrated in one housing. The actuator consists of a DC motor with a two-stage gear. The opening angle of the throttle valve is detected by the throttle position sensor which is mounted on the throttle body. And it provides feedback to the ECM to control the throttle motor in order to control the throttle valve opening angle properly in response to the driving condition.
In case an error happenes during ETC motor spring adaptation or TPS spring is out of order, ECM sets P2119.
Item
Detecting Condition
Possible Cause
DTC Strategy
ETC Monitoring
Poor connection
Incompleted of unexecuted adaptation
Faulty motor
Enable Conditions
IG On
Threshold Value
Error or abort during the ETC motor spring adaptation
Limp-home pos. 1.8~13.1%
ETC without adaptation procedure after replacement
ETC amplification factor error
Abort during the initial adaptation
Abort during the re-adaptation
Diagnostic Time
Once at IG ON
MIL ON Condition
5 sec
This is a ETC motor signal waveform with acceleration.
ECM controls ETC motor(DC motor) to operate the throttle valve.
ETC motor operate and change the throttle valve position in order to open the closed throttle valve under the acceleration condition.