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Home >> Lexus >> 2001 >> LS 430 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0121: Throttle Position (TP) Sensor "A" Circuit Range/Performance Fault >> Circuit Description

Circuit Description

The TP sensor is a dual variable resistor sensor that monitors throttle opening and TP sensor malfunction. Based on TP sensor signal, ECM determines vehicle driving condition and uses and uses throttle control motor to set throttle angle accordingly. DTC is set when VTA and VTA2 circuit voltage on TP sensor is out of range for 2 seconds. Possible cause is; faulty TP sensor.

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