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 | 1. Open in Control circuit 2. Poor connection or damaged harness 3. Faulty ETC Motor |
Case2 |
•
Deviation between throttle position and constant setpoint check | ||
Case3 |
•
Deviation between throttle position and moving setpoint check | ||
Enable Conditions | Case1 |
•
TPS adaptation finished
•
Battery voltage >10V
•
No relevant error | |
Case2 |
•
TPS adaptation finished
•
Constant TPS setpoint
•
No relevant error | ||
Case3 |
•
TPS adaptation finished
•
No relevant error | ||
Threshold Value | Case1 |
•
Moving mean value of the controller output > 95% | |
Case2 |
•
Throttle position - Throttle position setpoint >2.5% | ||
Case3 |
•
Throttle position - Throttle position setpoint >10% | ||
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 | ||
