Circuit description
The sensor is an active sensor, i.e. the sensor must
receive
operating
voltage. Pin 17 on the engine control
unit (EMS2) connector B provides pin 1 on the sensor
with an operating voltage of +5 Volt. Pin 4 on the sen-
sor is connected to battery negative via pin 18 on the
EMS2. The output signal from the pressure sensor, pin
2 on the sensor to pin 16 on the EMS2, is a voltage
signal that is proportional to the fuel pressure. The out-
put signal is linear within the sensors working range.
Some engines has a fuel bleeding pump. The fuel
bleeding pump is used when the fuel system has to be
bled.
Component specification
Working range: 0 – 7 bar = 0 – 700 kPa
Supply voltage: 5,00 +/- 0,25 VDC
Nominal output voltage at 25 °C and at supply voltage
5,00 VDC:
0,5 VDC @ 0 bar = 0 kPa
4,5 VDC @ 7 bar = 700 kPa
Measurements
Checking supply cable, fuel sensor page 141
Checking negative cable, fuel sensor page 142
Checking the signal cable for interruption or
shortcircuit page 143
Checking fuel pressure sensor page 144
SB
(+) 17
(-) 18
16
SB
GN /BL
R / BL
R
P
P
2
2
1
1
4
4
3
5
-
+
EMS2
A
B
C
D
p0013472
A Connector B
B Fuel press switch
C
Fuel pressure
D Fuel bleeding pump
0 100 200
300
400 500 600 700
5
4
3
2
1
0
V
kPa
P0013477
V Output voltage
KPa Oil pressure
P0002552
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