General Information

Engine Control
P0123 Throttle Position Sensor 1 Signal Circuit High Input - General Information

Component Location





General Description

The Electronic Throttle Control (ETC) system consists of the throttle body, Throttle Position Sensor (TPS) 1 & 2 and Accelerator Position Sensor (APS) 1 & 2. TPS 1 & 2 share the same source voltage and ground. The PCM controls the throttle motor to open and close the throttle valve. The TPS1 output voltage increases in proportion with the throttle valve opening angle after starting. TPS2 output voltage decreases in proportion with the throttle valve opening angle after starting. The TPS provides feedback to the PCM to control the throttle motor in response to the APS.

DTC Description

PCM monitors output signal from TPS1 every 8.5 seconds. If an output signal is above 4.75V for more than 0.1 seconds, the PCM sets a P0123 DTC.

DTC Detecting Condition





Specification





Diagnostic Circuit Diagram





Signal Waveform & Data




















Fig.1) Normal waveform of TPS1 & TPS2 with acceleration pedal not depressed with IG "ON"
Fig.2) Normal waveform of TPS1 & TPS2 with acceleration pedal depressed with IG "ON"
Fig.3) Normal data of TPS1 & TPS2 with IG "ON" condition
Fig.4) Normal data of TPS1 & TPS2 with open condition
Fig.5) Normal data of TPS1 & TPS2 with short to ground in TPS1 circuit