P2176
P2176 – Throttle Actuator Control System – Idle Position Not Learned
Possible causes
- Faulty Throttle Actuator Control (TAC) module
- Throttle Actuator Control (TAC) module harness is open or shorted
- Throttle Actuator Control (TAC) module circuit poor electrical connection
- Throttle plate sticking due to carbon build-up
- Engine Control Module
- Engine Light ON (or Service Engine Soon Warning Light)
- No throttle pedal response
P2176 Description
The Engine Control Module (ECM) is the control center for the Throttle Actuator Control (TAC) system. The ECMdetermines the drivers intent and then calculates the appropriate throttle response. The ECM achieves throttle positioning by providing a pulse width modulated voltage to the TAC motor. The TAC system uses the following circuits for Motor control 1 and Motor control 2.
Two processors are also used to monitor the TAC system data. Both processors are located within the ECM. Both processors monitor each other’s data to verify that the indicated throttle position is correct.
