Circuit/System Description

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

For an overview of the component/system, refer to: Exhaust Aftertreatment System Description

Component	Description
B136 Exhaust Particulate Matter Sensor	The sensor measures the particulate matter in the form of soot in the exhaust. The actual sensor surface is only a few square millimeters in size. On the surface there are 2 microscopic comb-shaped electrodes with intertwined tines (electrical traces) to have the longest possible route of transitions from one to the other electrode. Soot is conductive, therefore when soot deposits between the electrodes, electrical current can flow from one electrode to the other. The more soot deposits between the electrodes, the lower the resistance. To measure the resistance, voltage is applied to the electrodes. The voltage also generates an electrical field that attracts the soot. If the sensor surface is saturated, the sensor is electrically heated to burn off the soot. The sensor sends measured values and state of health information via serial data to the ECM and the reductant control module.
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

B136 Exhaust Particulate Matter Sensor

The sensor measures the particulate matter in the form of soot in the exhaust.
The actual sensor surface is only a few square millimeters in size. On the surface there are 2 microscopic comb-shaped electrodes with intertwined tines (electrical traces) to have the longest possible route of transitions from one to the other electrode. Soot is conductive, therefore when soot deposits between the electrodes, electrical current can flow from one electrode to the other. The more soot deposits between the electrodes, the lower the resistance. To measure the resistance, voltage is applied to the electrodes. The voltage also generates an electrical field that attracts the soot. If the sensor surface is saturated, the sensor is electrically heated to burn off the soot.
The sensor sends measured values and state of health information via serial data to the ECM and the reductant control module.

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.