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Home >> Pontiac >> 2000 >> Firebird Formula, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Control System - Self-Diagnostics - 3.8L) >> Diagnostic Tests >> DTC P0121: TP Sensor Performance >> Circuit Description
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Circuit Description

WARNING: This page is about a different variant/trim than selected.

Throttle Position (TP) sensor measures amount of throttle opening. PCM uses TP sensor information for fuel delivery calculations. TP sensor readings during acceleration are much higher than those during deceleration or idle. DTC will set if PCM detects an out of range condition.

For duplication of DTC, ensure no MAP or TP sensor DTCs are set, engine is running, ECT sensor temperature is greater than 158°F (70°C), MAP sensor reading is less than 50 kPa or greater than 70 kPa, and MAP is steady for 5 seconds or more.

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