Exhaust back pressure sensor, component description - GF07.04-P-6130P
ENGINE 642 in MODEL 164.1/8, 203.0/2, 221.0/1, 251.0/1 up to Model Year 8
ENGINE 642 in MODEL 209.3/4, 211.0/2/6, 219.3
ENGINE 642 in MODEL 463
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.
Function
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.