Circuit/System Description

WARNING: This page is about a different variant/trim than selected.

Circuit	Description
Signal	The control module input circuit has an internal resistance connected to 5 V.
Ground	Grounded through the control module.

Component	Description
B75C Multifunction Intake Air Sensor	The intake air temperature sensor 2 is integrated in the mass air flow sensor. The intake air temperature sensor 2 varies its resistance depending on the temperature. The intake air humidity sensor uses the same signal circuit as the intake air temperature sensor 2. The intake air humidity sensor modulates the pulse width of the signal. The intake air temperature sensor 2 modulates the frequency of the signal. That means the signal is both, PWM and FM modulated.
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

B75C Multifunction Intake Air Sensor

The intake air temperature sensor 2 is integrated in the mass air flow sensor. The intake air temperature sensor 2 varies its resistance depending on the temperature. The intake air humidity sensor uses the same signal circuit as the intake air temperature sensor 2. The intake air humidity sensor modulates the pulse width of the signal. The intake air temperature sensor 2 modulates the frequency of the signal. That means the signal is both, PWM and FM modulated.

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.