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 PCM to control the throttle motor in order to control the throttle valve opening angle properly in response to the driving condition.
PCM sets DTC P2118 if the PCM 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%
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 PCM limits engine speed to 1500rpm
Electrical check of the ETC system is prohibited
MIL On Condition
Immediate