Circuit description
The sensor which measures the oil pressure is an
active sensor, i.e. it must have operating voltage.
The engine control unit, connector A, pin 7, supplies
the sensor, pin 1 with +5 Volt. The sensor, pin 4, is
connected to battery negative via the engine control
unit, connector A, pin 11.
The output signal from the pressure sensor, pin 2, to
the
engine
control unit, connector B, pin 11, is a voltage
signal which is proportional to the oil pressure (after
the oil filters). The output signal is linear within the sen-
sors working range.
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, oil pressure
sensor page 147
Checking negative cable, oil pressure
sensor page 148
Checking signal cable, oil pressure sensor page 148
Checking oil pressure sensor page 149
P0013480
P
2
1
4
Conn. A
EMS2
(+) 7
(-) 11
11
(black)
(black)
Conn. B
SB
R
BL / OR
a Connector A
b Connector B
c
Oil pressure
0 100 200
300
400 500 600 700
5
4
3
2
1
0
V
kPa
P0013477
V Output voltage
KPa Oil pressure
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