Circuit Description

The throttle body assembly contains the following components:

• The throttle blade
• The throttle actuator motor
• The throttle position (TP) sensor 1 and 2
• The throttle actuator control (TAC) module

The TAC system monitors the throttle position with 2 sensors. If the powertrain control module (PCM) receives a message from the TAC module that indicates one of the following conditions, DTC P0120 will set:

• The TP sensor 1 voltage is outside a predetermined range.
• The reference voltage is out of range.
• An improper throttle blade minimum position was learned.