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 P2119 if the ECM detects TPS adaptation procedure is abnormal
Item
Detecting Condition
Possible Cause
DTC Strategy
Case1
? TPS adaptation Lower position check
? Poor connection or damaged harness
? Faulty ETC motor
Case2
? TPS adaptation error low return spring check
Case3
? TPS adaptation upper position check
Case4
? TPS adaptation error upper return spring check
Case5
? TPS start check error in spring check
Case6
? TPS start check error in limp-home-check
Enable Conditions
? During TPS adaptation
? TPS setpoint = 11.9%
Case2,4
? TPS setpoint = 29%
? During TPS start check
? TPS setpoint = 24.2%
? No engine start condition
Threshold Value
? Throttle position for the lower return spring check is not reached within a limit maximum time(Difference between throttle position and setpoint >0.48%)
? When ETC power stage is off, Throttle can not return by spring power in the limp-home position within a limit maximum time(Difference between Throttle position and adapted voltage in limphome position >0.18 V)
? Throttle position for the upper return spring check is not reached within a limit maximum time(Difference between throttle position and setpoint >0.48%)
? When ETC power stage is off, Throttle cannot return by spring power in the limp-home position within a limit maximum time(Difference between Throttle position and adapted voltage in limphome position >0.18 V)
? Throttle flap cannot reach the setpoint within the hysteresis within a limit maximum time(Difference between throttle position and requested position >0.48%)
? When ETC power stage is off, Throttle cannot return by spring power in the limp-home position within a limit maximum time(Difference between Throttle position and adapted voltage in limphome position >0.18V)
Diagnostic Time
? 0.8~1.2 sec.
Limp-Home
? Forced limited RPM mode : The ECM limits engine speed to 1500rpm
? Electrical check of the ETC system is prohibited
Motor Resistance at 20°C(68°F)
1.2~1.8?