Rail pressure sensor
(1) Metal diaphragm
(2) Distortion sensor part (Metal
gauge)
(3)
Signal processing circuit
(4) Voltage
(5) Pressure
(A) Fuel pressure
(B) Pressurization
(C) Tensile
The rail pressure sensor detects the fuel pressure
inside the
rail, converts this to an electronic signal and
sends it to the engine ECU.
When the fuel pressure (A) in the rail is applied to the
metal diaphragm, the diaphragm is distorted.
Metal gauges are positioned in the center and at the
edge of the metal diaphragm and tensile (C) or
pressurization (B) force is applied.
A difference in resistance values is generated based on
the force that is applied.
Please note that the rail pressure sensor is not
available separately as a part, so replacement requires
replacing the rail assembly.
Pressure limiter
The pressure limiter operates when the pressure inside
the rail becomes excessively high (valve opens), and
then once the pressure drops to a certain pressure, it
acts to keep the pressure (valve closes).
Fuel discharged by the pressure limiter returns to the
fuel tank. Please note that the pressure limiter is not
treated as a part, so replacement requires replacing the
rail assembly.
3.12.4 Specification of rail assembly
Rail pressure sensor
Operating voltage 5 V
Output characteristics
(1) Output voltage (V) (2) Pressure (MPa)
Pressure limiter
Valve opening
pressure
Reference val-
ue
Approx.
200 MPa
2039 kgf/cm
2
29000 psi
Valve closing pres-
sure
Approx.
50 MPa
510 kgf/cm
2
7260 psi
MECHANISM
3. Fuel system 4. ENGINE
D1803-CR-E4,D1803-CR-TE4,D1803-CR-TIE4,V2403-CR-E4,V2403-CR-TE4,V2403-CR-TE4BG,V2403-CR-TIE4
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