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Home >> Toyota >> 2003 >> MR2 C65M >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self Diagnostics >> Diagnostic Tests >> DTC P0121: Throttle/Pedal Position Sensor/Switch "A"Circuit Range/Performance Problem >> Circuit Description
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Circuit Description

Throttle Position (TP) sensor is a variable resistor which monitors throttle opening. ECM determines vehicle driving condition and adjusts air/fuel mixture accordingly.