C 240 Sedan (203.061) V6-2.6L (112.912) (2002)
Barometric Pressure Sensor: Description and Operation
With CODE (494a) USA Version
Engine 113.943 as of 6/1/00
Design
Pressure sensor position
-
Engine 111 EVO EURO3/4
Purpose
-
Detecting the absolute pressure in the intake manifold
-
The pressure information is required for:
-
Function chain check OBD and EURO3/4 (e.g. camshaft adjustment, exhaust gas recirculation or (USA) leaktightness of evaporative emission
control system)
-
ME2.8: altitude recognition for start enrichment
-
Engine 113.960 with code 479: test of cylinder shutoff
Function
The pressure in the intake manifold alters the shape of a diaphragm and the piezo resistors alter their resistance. The output voltage which is influenced
as a result of this, is used by the ME-SFI control module as information regarding the pressure in the intake manifold