Soot particulate sensor, basic function · gf4920p2004a · Mercedes-Benz WIS

GF49.20-P-2004A

Soot particulate sensor, basic function

23.06.2020

Engine	608
Engine	654 in model 118, 167, 177, 247
	with code 460 (Canada version)
	with code 494 (US version)
Engine	656 in model 167
	with code 460 (Canada version)
	with code 494 (US version)

P49.20-A054-79

Example illustration of soot particulate sensor

Soot particulate sensor

Soot particulate sensor control unit

Overview

This document contains information on:

 General

 Function

General

The soot particulate sensor determines the soot particulate concentration in the exhaust gas and derives from this the filtration efficiency of the soot particulate filter.

The soot particulate sensor control unit then processes the signals of the soot particulate sensor.

Function

The soot particulate sensor is designed as a zirconium-oxide (ZrO2) probe. It has an integrated heating element for periodical regeneration of the sensor and interdigital electrodes for determining the soot particle content in the exhaust. Exhaust cleaned of soot particles creates voltage between the interdigital electrodes here. Decisive for the determination of the soot particle content is the reaction time until a specified voltage threshold value is exceeded. In addition, a temperature sensor is integrated for monitoring the exhaust temperature; this forwards the current exhaust temperature to the combustion engine control unit by means of a change in resistance.

	Control units
	Soot particulate sensor control unit, basic function	Engine 608 Engine 654 in model 118, 167, 177, 247 with code 460 (Canada version) with code 494 (US version) Engine 656 in model 167 with code 460 (Canada version) with code 494 (US version)	GF49.20-P-9893A

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