TOHATSU BFT115A Service Manual page 683

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
smaller signal when the oil pressure is low and 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:
PIEZOELECTRIC
DEVICE
EOP SENSOR
TERMINAL
EOP SENSOR
5 V
0 V
LOW
OIL PRESSURE
CYLINDER BLOCK
OIL PASSAGE
HIGH
21-3