D439E Service Manual 4. Fuel system
190
Rail Pressure Sensor
Inspection
In order to output a voltage signal corresponding to
the applied pressure to the ECM, the rail pressure
sensor must measure the instant pressure in the rail.
The fuel flows to the rail pressure sensor through an
inlet of the rail. The end of rail pressure sensor is
sealed off by the sensor diaphragm. Pressurized
fuel reaches the sensors diaphragm through a blind
hole. The sensor element (semiconductor device)
for converting the pressure to an electric signal is
mounted on this diaphragm. The signal generated
by the sensor is inputted to an evaluation circuit
which amplifies the measuring signal and sends It to
the ECU.
Sensor Inspection
Check items Rail pressure value
Data display Rail pressure value
Display condition Engine idle
Rail pressure 35~50MPa
Normal value (Hi-scan) 40MPa
NOTE : Check the rail pressure with diagnosis
equipment after engine has been warmed up
enough.
Coolant temperature : 85 ± 3°C,
Fuel temperature : 35 ± 3°C
Harness Inspection Procedure
Refer to P0192, P0193, and P0194 DTC Inspection
procedure.
Sensor Inspection
1. If the rail pressure sensor falls, replace the
common rail assembly.
2. Tightening torque of common rail bracket flange
bolt is 22~33kgf.m.
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