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Home >> Toyota >> 2001 >> Land Cruiser >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Self-Diagnostics >> Diagnostic Tests >> DTC P0121: Throttle Position Sensor Circuit Range/Performance >> Circuit Description
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Circuit Description

Throttle Position (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; defective Throttle Position (TP) sensor.