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Home >> Lexus >> 2002 >> IS 300 Base, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0121: Throttle Position (TP) Sensor Circuit Range/Performance Fault >> Circuit Description
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Circuit Description

TP sensor is a 2 variable resistor sensor that monitors throttle opening and TP sensor malfunction. Based on TP sensor signal, ECM determines vehicle driving condition and adjusts air/fuel mixture accordingly. DTC is set when TP sensor VTA and VTA2 circuit voltage is out of range for 2 seconds. Possible causes are:

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