Fuel Pressure Sensor/Switch: Description and Operation

GF07.04-P-6210P Component Description For the Rail Pressure Sensor
ENGINE 642 in MODEL 164.1 /8, 203.0 /2, 221.0 /1, 251.0 /1 up to Model Year 2008
ENGINE 642 in MODEL 209.3 /4, 211.0 /2 /6, 219.3
ENGINE 642 in MODEL 461.3, 463.3 up to 31.5.12





Shown without code (494) USA version and without model 461.3

22 Right rail
B4/6 Rail pressure sensor

Location
The rail pressure sensor is screwed into the right rail at the rear.

Task
The rail pressure sensor is used to detect the current rail pressure and send it to the CDI control unit (N3/9).

Function
The rail pressure applied influences the location of a membrane which is fitted with a sensor element. A change in the location of a membrane alters the electrical resistance of the sensor element. This change in resistance causes a voltage signal which is evaluated by the CDI control unit to detect pressure.