LiuGong CLG835H, Service Manual

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Structure Function Principle
January 24, 2017
Monitoring system CLG835H
Fuel level sensor
Floaters are applied in the sensor, which shift up
and down along with the oil level of the fuel tank.
The floater influences the resistance value pass-
ing through the sensor. Once the circuit is con-
nected, the characteristics of resistance
changing with oil level are converted to that of
voltage varying with oil level. The changing volt-
age signal enters into the microcontroller of com-
bination instrument, which outputs signal through
the operation processing of microcontroller, to
drive the stepping motor-type instrument for oil
level indication.
Precautions
Switch off the electric lock, and replace the fuel
level sensor until the machine is completely
cooled if necessary. When replacing, prevent for-
eign matters from getting into the diesel tank.
Test steps of fuel oil level sensor faults
1. Disconnect the wiring harness of fuel level
sensor and the wiring harness of the com-
plete vehicle;
2. Remove the fuel level sensor from the fuel
tank;
3. Turn the digital multimeter to 10
00
Ω of Ω
position.
4. Connect the red probe to the terminal at #1
hole site of the sensor connector, while black
probe to #2 hole site;
5. Measure the varied resistance values of fuel
level sensor corresponding to the different
positions of the floater;
Fuel level sensor
P18E00032
P18E00033
Sealing washer
Oil level
P18E00034
Sensor signal terminal (green)
Earthing cable (black)
Technical parameters (After floater rises to the top, then drop to test)
Floater position (H) Gear Resistance ( Ω )
<65 Full level 68
65 8/9 136
94 7/9 204
123 6/9 272
152 5/9 340
181 4/9 408
210 3/9 476
242 2/9 544
277 1/9 612
316 0 level 680