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Home >> Toyota >> 2000 >> 4Runner Base, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Control System Self-Diagnostics - V6) >> Diagnostic Tests >> DTC P0121: Throttle Position (TP) Sensor Circuit Range/Performance >> Circuit Description
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Circuit Description

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TP sensor is a variable resistor mounted to throttle body and detects throttle opening angle. ECM determines vehicle driving condition and adjusts air/fuel mixture accordingly. DTC is set after vehicle speed has exceeded 19 MPH once and TP sensor output voltage is out of range while vehicle speed is 0-19 MPH. Possible cause is: