General Information

Engine Control
P2123 Accelerator Position Sensor 1 Signal Circuit High Input - 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 ECM judges the current opening angle of the accelerator pedal from APS 1 & 2, and the ECM 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, ECM sets P2123.

DTC Detecting Condition





Specification





Diagnostic Circuit Diagram





Signal Waveform & Data




Fig 1) Normal waveform of APS 1 & APS 2 with acceleration.

Signal waveform of APS 1 & 2 shows that APS 2 increases voltage just half of APS 1 voltage increase when accelerating.