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Home >> Lexus >> 2009 >> LS 600hL >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control (SFI) System (Diagnostic Codes (P0010-P0441)) >> SFI System >> DTC P0121: Throttle / Pedal Position Sensor / Switch "A" Circuit Range / Performance Problem >> Inspection Procedure

Inspection Procedure

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Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.