Faulty Throttle Body Assembly
Throttle Body Assembly harness is open or shorted
Throttle Body Assembly circuit poor electrical connection
Engine Light ON (or Service Engine Soon Warning Light)
The Engine Control Module (ECM) is the control center for the throttle body Throttle Actuator Control (TAC) system. The ECM determines the driver’s intent and then calculates the appropriate throttle response. The ECM achieves throttle positioning by providing a pulse width modulated voltage to the throttle body (TAC) motor. The throttle body (TAC) motor system uses the following circuits: Throttle body (TAC) motor control 1 and Throttle body (TAC) motor control 2.
Two processors are also used to monitor the throttle body (TAC) motor 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.
The Diagnostic Trouble Code (DTC) will set when the ECM detects the output circuit for the TAC motor is open, shorted to ground, or shorted to a voltage. The condition exists for greater than 1 s.