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Home >> Toyota >> 2004 >> Matrix Base, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 772 (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

WARNING: This page is about a different car, the 2004 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.

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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