Circuit/System Description

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

Circuit	Description
Ignition	Supplied from a fuse.
Signal	The control module input circuit has an internal resistance connected to 5 V.
Serial Data	Digitally encoded information for communication between devices.
Ground	Chassis Ground

Component	Description
B75 Mass Airflow Sensor	The assembly has several functions: The mass air flow sensor is a hot film type sensor that measures the mass of air (not the volume) entering the engine. The signal varies with engine load and is displayed by the scan tool in Hertz (Hz) and grams per second (g/s). The component houses the following sensors: Barometric Pressure Sensor Barometric Pressure Sensor 2 Intake Air Temperature Sensor Intake Air Temperature Sensor 2 Intake Air Humidity Sensor
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.

Component

Description

B75 Mass Airflow Sensor

The assembly has several functions:

The mass air flow sensor is a hot film type sensor that measures the mass of air (not the volume) entering the engine. The signal varies with engine load and is displayed by the scan tool in Hertz (Hz) and grams per second (g/s).
The component houses the following sensors:
- Barometric Pressure Sensor
- Barometric Pressure Sensor 2
- Intake Air Temperature Sensor
- Intake Air Temperature Sensor 2
- Intake Air Humidity Sensor

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.