TOHATSU BFT75A Service Manual page 588

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EOP SENSOR
A conventional EOP switch is an ON/OFF pressure switch, which includes a mechanical contact, that turns ON when the oil
pressure is below a specified value and turns OFF when the pressure is above a specified value.
The EOP sensor includes a piezoelectric device which converts the electronic signals into voltage, which ranges from 0 to 5 V, and
transmits to the ECM. The electronic resistance of the piezoelectric device changes in accordance with the oil pressure, sending a
smaller signal when the oil pressure is low and a larger signal when the oil pressure is high.
CONVENTIONAL SYSTEM
WITH EOP SWITCHES:
CYLINDER BLOCK
DIAPHRAGM
CONTACT
EOP SWITCH
EOP SWITCH TERMINAL
ON
OFF
FIXED OIL
PRESSURE VALUE
LOW
OIL PRESSURE
OIL PASSAGE
HIGH
TECHNICAL FEATURES
NEW SYSTEM WITH EOP SENSOR:
CYLINDER BLOCK
PIEZOELECTRIC
DEVICE
EOP SENSOR
TERMINAL
EOP SENSOR
5 V
0 V
LOW
OIL PRESSURE
OIL PASSAGE
HIGH
20-3