II-138
WSM Minor Change II Service Engineering Section
3-19 Fuel amount control
1. Outline
A map indicating the voltage and fuel relationship has been prepared by plotting each determined input
voltage based on the float position of the fuel sensor and the remaining fuel.
The power supply voltage (5V) is input into the microcomputer according to the partial voltage varied
with the float position. Therefore, when calculating the actual quantity of remaining fuel, make a map
conversion with consideration of the power supply voltage.
The fuel shortage alarm will be displayed when the quantity of remaining fuel is between approximately 5
and 10 liters, the range of which, however, varies with the model. As a rule of thumb, the fuel will last for
approximately one hour after the alarm turns ON.
(Calculation example) Voltage value is 0.899 for example.
Theoretically, water sensor’s resistance is 179.76 :
Fuel shortage alarm
Model
Fuel residual
amount [l]
KX41-3 5 ± 3
KX61-3 7 ± 3
KX71-3 7 ± 3
KX91-3SS 5 ± 2
KX101-3SS 5 ± 2
KX121-3SS 12 ± 2
KX161-3SS 12 ± 2
U35, U35-3 5 ± 2
U45-3 12 ± 2
Voltage and fuel map
(Water temp sensor)Circuit diagram & function(Fuel sensor)
(1)Fuel sensor (2)Water temp sensor (3)Meter (4)AD voltage
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