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.
When the ETC motor control duty value is over 80% and 5 sec, ECM recognizes it as throttle valve sticking and sends P2118.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
ETC Monitoring | 1. Poor connection 2. Open or Short in motor circuit 3. ETC motor |
Enable Conditions |
•
IG On
•
Battery voltage > 8V | |
Threshold Value |
•
ETC motor control duty value > 80% | |
Diagnostic Time |
•
5sec | |
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.
