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Home >> Lexus >> 2000 >> ES 300 >> Repair and Diagnosis >> External Pages >> Different car >> Section 2 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P1121: Accelerator Position Sensor Circuit Malfunction >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2000 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.

The accelerator pedal sensor is a 2 variable resistor sensor that monitors throttle opening and accelerator pedal sensor malfunction. The accelerator pedal sensor determines vehicle accelerator pedal position. ECM controls throttle motor and electromagnetic clutch based on the signal from accelerator pedal sensor. If DTC P1121 is set, ECM shuts down power to throttle control motor and electromagnetic clutch.

DTC P1121 is set when ECM consistently detects difference between VPA and VPA2 circuits out of tolerance. Possible causes are:

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