Circuit/System Description

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

For an overview of the component/system, refer to Heated Oxygen Sensor Description and Operation

Circuit	Description
Signal - Terminal 2	The control module input circuit has an internal resistance connected to 5 V.
Signal - Terminal 3	HO2S Pump Current Signal
Signal - Terminal 7	HO2S Pump Current Signal
Low Reference - Terminal 1	The control module input circuit has an internal resistance connected to ground.

Component	Description
B52 Heated Oxygen Sensor	Wideband oxygen sensors consist of two cells, a measuring cell and a pump cell. The voltage of the measuring cell, which depends on the oxygen concentration of the exhaust gas in the detection chamber, is compared with a target value of 450 mV (lambda = 1 corresponds to 450 mV). If this voltage deviates, then, by switching a pump current to the pump cell, as many oxygen ions are pumped into or out of the detection chamber as necessary for the voltage value of the measurement cell to once again correspond to 450 mV. This pump current is the measurement which describes the precise lambda value of the mixture almost linearly.
K20 Engine Control Module	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

B52 Heated Oxygen Sensor

Wideband oxygen sensors consist of two cells, a measuring cell and a pump cell. The voltage of the measuring cell, which depends on the oxygen concentration of the exhaust gas in the detection chamber, is compared with a target value of 450 mV (lambda = 1 corresponds to 450 mV). If this voltage deviates, then, by switching a pump current to the pump cell, as many oxygen ions are pumped into or out of the detection chamber as necessary for the voltage value of the measurement cell to once again correspond to 450 mV. This pump current is the measurement which describes the precise lambda value of the mixture almost linearly.

K20 Engine Control Module

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.