DTC P2101: Electronic Throttle Control System (ETCS) Malfunction: General Description

The electronic throttle control system (ETCS) controls the throttle valve opening. The system is composed of the throttle actuator, the throttle valve, throttle position (TP) sensors A and B, the ETCS control relay, the accelerator pedal position (APP) sensor, and the engine control module (ECM)/powertrain control module (PCM). When the driver presses the accelerator pedal, the APP sensor reacts and detects the accelerator opening value. The accelerator pedal opening value is converted to a signal in the APP sensor and transmitted to the ECM/PCM to compute the target position. The ECM/PCM determines the throttle valve target position according to the signal received and operates the throttle actuator to move the throttle valve to the target position. The actual throttle valve position is determined by TP sensors A and B installed in the throttle body. The ECM/PCM compares the throttle valve target opening angle and the actual throttle valve opening angle from TP sensors A and B, and when the difference exceeds the specification, the ECM/PCM detects the malfunction of the throttle actuator system and a DTC is stored.