Electric Throttle
The ECM uses the electric throttle to help regulate engine torque.
The electric throttle is installed between the T piece duct of the intake air distribution and filtering system, and the inlet of the supercharger. Refer to: Intake Air Distribution and Filtering - V6 S/C 3.0L Petrol
The throttle plate is operated by an electric Direct Current (DC) motor integrated into the throttle body. The ECM uses a PWM signal to control the DC motor. The ECM compares the APP sensor inputs against an electronic request or value to determine the required position of the throttle plate. The ECM and electric throttle are also required to:
- Monitor requests for speed control operation
- Automatically operate the electric throttle for accurate speed control
- Perform all Dynamic Stability Control (DSC) engine interventions
- Monitor and carry out maximum engine speed and road speed cut outs
- Provide different engine maps for the ride and handling optimization system.
A software strategy within the ECM calibrates the position of the throttle plate at the beginning of each ignition cycle. When the ignition is turned on, the ECM performs a self test and calibration routine by fully closing the throttle plate and then opening it again. This tests the default position springs and allows the ECM to learn the fully closed position.