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Home >> Lexus >> 2006 >> SC 430 >> Repair and Diagnosis >> Engine Performance >> System >> SFI System - Diagnostics >> DTC P2121: Throttle/Pedal Position Sensor/Switch "D" Circuit Range/Performance >> Monitor Description
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Monitor Description

The accelerator pedal position sensor is mounted on the accelerator pedal bracket and consists of two sensors VP 1 and VP 2. The VP 1 is used to detect accelerator pedal position, and the VP 2 is used to monitor the VP 1 and detect faults in the sensor itself. When the difference between voltage outputs of the VP 1 or VP 2 deviates from the standard range, the ECM concludes that there is a defect in the PP sensor. The ECM illuminates the MIL and sets a DTC.