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Home >> Toyota >> 2017 >> 4Runner TRD Pro >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System - Diagnostic Codes (P0560-P2121) >> SFI System >> DTC P2121: Throttle / Pedal Position Sensor / Switch "D" Circuit Range / Performance [08/2015 - ] >> Monitor Description
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Monitor Description

When the difference between the output voltages of VPA and VPA2 deviates from the standard, the ECM determines that the accelerator pedal sensor assembly is malfunctioning. The ECM turns on the MIL and stores the DTC.