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Structure and inner electrical connection

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The rail pressure sensor is connected via a 3-pin plug connection.

The sensor is supplied with 5 Volts by the engine control.

Fig 1: Rail Pressure Sensor - Circuit Diagram
G09910143Courtesy of BMW OF NORTH AMERICA, INC.
Item Explanation
1 Rail pressure sensor
PIN REFERENCE

Pin Explanation
SIG Rail pressure signal
5 V 5 Volts, supply voltage
Terminal 31E Terminal 31, electronics earth (ground)