General Information

Engine Control(SULEV)
P0121 Throttle/Pedal Position Sensor/Switch \'A\' Circuit Range/Performance - 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. TPS1&2 are sharing the same source voltage and ground. The throttle valve opening is control by throttle motor which is controlled by Engine Control Module(PCM). The opposite position indicator shows inverted signal characteristics. TPS1 output voltage increases smoothly in proportion with the throttle valve opening angle after starting. TPS2 output voltage decreases in inverse proportion with the throttle valve opening angle after starting. TPS provides feedback to the PCM to control the throttle motor in order to control the throttle valve opening angle properly in response to the driving condition.

DTC Description

The DTC P0121 is set when the intake manifold model filtered reduced area controller is out of range in low or high load.

DTC Detecting Condition





Diagnostic Circuit Diagram