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Home >> Pontiac >> 2001 >> Firebird Base, 2D Convertible, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 3.8L >> Diagnostic Tests >> DTC P1221: Throttle Position Sensor 1 & 2 Disagree >> Description

DTC P1221: Throttle Position Sensor 1 & 2 Disagree: Description

NOTE: Throttle Position (TP) sensors No. 1 and 2 may also be referred to as Throttle Actuator Control (TAC) assembly.

Throttle Position (TP) sensor is part of throttle body of Throttle Actuator Control (TAC) assembly. TP sensor is actually 2 individual TP sensors within 1 housing. Two separate signals, a low-reference and 5-volt reference circuit are used to connect TP sensor assembly to TAC module. TP sensor signal voltage increases as throttle opens. The signal circuit for TP sensor is pulled up to 5-volt reference voltage.

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