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Home >> Lexus >> 2005 >> GS 300 >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine (2JZ-GE) - Diagnostics >> Circuit Inspection >> DTC P0120, P0122, P0123: Throttle Pedal Position Sensor/Switch "A" Circuit, Throttle Pedal Position Sensor/Switch "A" Circuit Low/High Input >> Monitor Description

Monitor Description

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

  1. There is an expected specific voltage difference 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 the range of +/-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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