F 550 2WD Super Duty V8-6.4L DSL Turbo (2008)
Throttle Body: Description and Operation
INTAKE THROTTLE
Intake Throttle
The intake throttle modifies the intake airflow from the charge air cooler (CAC) into the exhaust gas recirculation (EGR) mixing elbow and into the
intake manifold. The intake throttle uses an electric motor to open and close a throttle plate, based upon inputs from the PCM. The intake throttle
actuator is a smart device, which is controlled by a pulse width modulated (PWM) signal to attain the desired position using the ITVC (control) circuit.
The intake throttle actuator determines the gains and control for the desired position. The desired position is between 5% and 95%.
The intake throttle actuator signals the intake throttle plate status to the PCM using the ITVF (feedback) circuit. If the feedback signal is 12 volts, the
throttle plate is at the desired position. If the feedback signal is low, a DTC is set indicating the throttle plate is not at the desired position or is out of
range. The feedback signal does not indicate actual throttle plate position.
The intake throttle is used only during diesel particulate filter regeneration events for air/fuel ratio control.
