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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 40 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0121: Throttle (TP)/Pedal Position Sensor Switch "A" Circuit Range/Performance Fault >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2002 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.

TP sensor is located on throttle body and has 2 variable resistors integral to TP sensor. TP sensor monitors throttle opening. ECM determines vehicle driving condition and adjusts air/fuel mixture accordingly. DTC is set when ECM detects TP sensor output voltage is out of range during vehicle operation. Possible cause is; faulty Throttle Position (TP) sensor.

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