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Home >> Lexus >> 1998 >> LX 470 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Self-Diagnostic Tests >> DTC P1121: Accelerator Pedal Position (App) Sensor Range/Performance Fault >> Circuit Description

Circuit Description

The APP sensor is located on throttle body and has 2 variable resistors integral to sensor. APP sensor monitors accelerator position and is connected with the accelerator pedal by the accelerator wire. APP sensor signal voltage (0-5 volts) to ECM changes in proportion to accelerator pedal opening angle. ECM turns off power to the throttle motor based on APP sensor voltage signals. DTC is set when ECM detects voltage is out of range on VPA circuit or VPA2 circuit. Possible causes are:

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