DTC P0121 - TP SENSOR SYSTEM PERFORMANCE Oldsmobile Bravada II

Note. For circuit reference, see WIRING DIAGRAMS - 4.3L article.

Circuit Description

Throttle Position (TP) sensor measures amount of throttle opening. VCM uses TP sensor information for fuel delivery calculations. TP sensor readings during acceleration are much higher than those during deceleration or idle.

TP sensor signal is one of the most important inputs used by the VCM for fuel control and for most of the VCM control inputs.

Conditions for setting DTC

1. No BARO, IAT, MAP, TP related DTCs are present.
2. Engine is running.
3. BARO not defaulted.
4. Change in TP is less than 1.9 percent.