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Home >> Lexus >> 2004 >> IS 300 Base, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> Engine Control System - Diagnosis >> Circuit Inspection >> DTC P0120: Throttle Pedal Position Sensor/Switch "A" Circuit, DTC P0122: Throttle Pedal Position Sensor/Switch "A" Circuit Low Input, DTC P0123: Throttle Pedal Position Sensor/Switch "A" Circuit High Input >> Monitor Description
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Monitor Description

The ECM uses the throttle position sensor to monitor the throttle valve opening angle.

  1. There is a specific voltage difference expected between VTA1 and VTA2 for each throttle opening angle.
    • If the difference between VTA1 and VTA2 is incorrect, the ECM interprets this as a fault and will set a DTC.
  2. VTA1 and VTA2 each have a specific voltage operating range.
    • If VTA1 or VTA2 is out of the normal operating range, the ECM interprets this as a fault and will set a DTC.
  3. VTA1 and VTA2 should never be close to the same voltage levels.
    • If VTA1 is within 0.02 V of VTA2, the ECM interprets this as a short circuit in the throttle position sensor system and will set a DTC.
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