Circuit Description

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The DTC P2554 Throttle Actuator Control (TAC) Inhibit Circuit Low Voltage diagnostic detects a fault in the TAC motor control circuit. The powertrain control module (PCM) receives accelerator pedal position (APP) sensor information and calculates the desired throttle position. The PCM sends this desired throttle position or target value to the TAC module. The TAC module achieves the desired throttle position by commanding the throttle control motor to position the throttle valve at the target value. The TAC module then compares the throttle position (TP) sensor 1 value to the target value. If necessary, the throttle control motor is moved slightly in order to obtain the exact target value position. If the TAC motor control circuit voltage is too low, DTC P2554 sets. The TAC motor and circuitry are integral parts of the TAC module and are not serviced separately. The TAC module is not serviceable and must be replaced with the throttle body assembly. For additional information on the operation of the TAC system, refer to Throttle Actuator Control (TAC) System Description .