General Information

Engine Control
P2123 Throttle/Pedal Position Sensor/Switch D Circuit High - General Information

Component Location





General Description

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 APS is mounted in the accelerator pedal to detect the opening angle of the accelerator pedal. It has 2 sensors to detect the accelerator position and a malfunction of the accelerator position sensor. The PCM judges the current opening angle of the accelerator pedal from APS1&2, and the PCM controls the throttle motor based on these signals.

DTC Description

Checking output signals from APS 1 under detecting condition, if output signals are above the threshold. PCM sets P2123. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till 1 driving cycle.

DTC Detecting Condition





Specification





Diagnostic Circuit





Signal Waveform




This is a signal waveform of APS 1 & 2 which shows that APS 2 increases voltage just half of APS 1 voltage increase when accelerating.