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.
ECM sets DTC P2118 if the ECM detects motor’s PWM signal exceeds threshold value
Item
Detecting Condition
Possible Cause
DTC Strategy
Case1
? PWM range check
? Open in control circuit
? Poor connection or damaged harness
? Faulty ETC motor
Case2
? Deviation between throttle position and constant setpoint check
Case3
? Deviation between throttle position and moving setpoint check
Enable Conditions
? TPS adaptation finished
? Battery voltage >10V
? No relevant error
? Constant TPS setpoint
Threshold Value
? Moving mean value of the controller output > 95%
Case2,3
? Throttle position - Throttle position setpoint > 2.4%
? Throttle position - Throttle position setpoint > 9.5%
Diagnostic Time
? 0.5 sec.
Limp-Home
? Forced limited RPM mode : The ECM limits engine speed to 1500~3000rpm
? Electrical check of the ETC system is prohibited