Circuit/System Description

WARNING: This page is about a different car, the 2022 Cadillac CT5. However, it is still accessible from the selected car via links, so may be relevant.

For an overview of the component/system, refer to: Compressor Air Intake Turbocharger System Description

Circuit	Description
Control - Terminal 1	The output circuit is switched from ground to 12 V to activate the component.The output is PWM controlled.
Control - Terminal 5	The output circuit is switched from ground to 12 V to activate the component.The output is PWM controlled.

Component	Description
K20 Engine Control Module	The control module contains a microprocessor used to process input data to control outputs. The control module controls a series of actuators to ensure optimal engine performance. The control module does this by reading values from a variety of sensors, interprets the data and adjusts the engine actuators accordingly.
M128A Turbocharger Wastegate Actuator - Bank 1 M128B Turbocharger Wastegate Actuator - Bank 2	The assembly has several functions: The valve is actuated by a 12 V DC motor. A spring is used to keep the valve in the open position. The valve actuator motor moves the valve in the closed direction. The more current flows through the motor, the more the valve closes. The component M128 contains a contactless inductive position sensor. A fixed transmitter coil excites a movable rotor, which in turn induces a current in a fixed receiver coil. The current varies with the angle of the rotor. Electronics inside the sensor convert the current into digital data which is transmitted via a serial data circuit to the control module K20.

Component

Description

K20 Engine Control Module

The control module contains a microprocessor used to process input data to control outputs.
The control module controls a series of actuators to ensure optimal engine performance. The control module does this by reading values from a variety of sensors, interprets the data and adjusts the engine actuators accordingly.

M128A Turbocharger Wastegate Actuator - Bank 1
M128B Turbocharger Wastegate Actuator - Bank 2

The assembly has several functions:

The valve is actuated by a 12 V DC motor. A spring is used to keep the valve in the open position. The valve actuator motor moves the valve in the closed direction. The more current flows through the motor, the more the valve closes.
The component M128 contains a contactless inductive position sensor. A fixed transmitter coil excites a movable rotor, which in turn induces a current in a fixed receiver coil. The current varies with the angle of the rotor. Electronics inside the sensor convert the current into digital data which is transmitted via a serial data circuit to the control module K20.