GL 320 CDI (164.822) V6-3.0L DSL Turbo (642.940) (2008)
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Exhaust Pressure Sensor: Description and Operation
GF07.04-P-6130P Exhaust Back Pressure Sensor, Component Description
Location
The exhaust back pressure sensor is located at the engine at the rear left next to the left exhaust gas recirculation positioner (Y27/9).
Task
The exhaust back pressure sensor determines the exhaust back pressure upstream of the turbocharger. The pressure value is used by the CDI control unit
(N3/9) to monitor the diesel particulate filter (DPF) fill level and for protection of the turbocharger and engine.
The exhaust gas back pressure deforms a membrane, which affects a potentiometer. This alters the resistance value of the potentiometer and influences
the signal voltage, which is used as information regarding the exhaust gas back pressure for the CDI control unit.