Fuel Level Sensor - jcb JS300 Service Manual

Location
The fuel level sensor 1 is located in the fuel tank.
Fig 54.
Overview
A level sensor is fitted in the fuel tank to measure the level
of fuel in the tank.
The level sensor consists of a rod surrounded by a tube
and a micro controller and resistance emulator. The rod
and tube act as a capacitor. Depending on the fuel level,
the remaining air volume between the rod and the tube
varies. The resultant capacitive change is recorded and
processed by the micro controller. The emulator converts
the capacitance into a resistance which is sent to the
MECU.
The MECU converts the resistance value to a percentage
fuel content. The percentage value is sent via the CANbus
to the display monitor.
The display monitor drives the analog fuel gauge.
Note: Machines with a 7 in display monitor have a digital
representation of an analog fuel gauge.
C-116

Fuel Level Sensor

1
C129640
9813/5100-1
Section C - Electrics
Engine and Power Control
Wires and Connectors
Fig 55. Fuel level sensor harness connector C021
Table 6.
Harness connector C021
Pins Details
A Sensor supply (24V)
B Earth
C Sensor signal
K Fig 56. Circuit ( T C-117)
Fuel Level Sensor
C129250
C-116