Can-Am DS 450 2008 Shop Manual page 287

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1. Neutral (N) indicator light
2. Check engine indicator light
3. Low fuel level indicator light
The low fuel level indicator light looks like the
check engine and neutral indicator lights, but it is
different in that it is actually a light bulb and not an
LED.
The low fuel level sensor is a thermistor mounted
on the fuel pump module inside the fuel tank.
When the electrical system is powered, a current
circulates through the negative temperature coef-
ficient sensor (NTC) which produces heat. The fu-
el in the tank cools the sensor (a thermistor) pre-
venting its resistance value from dropping, there-
fore limiting current flow due to the high resis-
tance of the thermistor.
When the fuel level has dropped to the point
where it cannot sufficiently cool the thermistor,
its resistance value drops due to the increase in
temperature. This causes an increase in current
flow to the point where the low fuel level light will
come on, at first dim, then brighter as the current
flow increases.
Low Fuel Level Indicator Light
Dynamic Test
To test the low fuel level indicator light operation,
remove the fuel cap and syphon the fuel out of the
tank until it is just below the fuel pump.
Install the fuel cap.
Set the engine stop switch to "RUN".
Set ignition switch to "ON".
As the thermistor heats up with power applied,
the low fuel level light should come on.
If the light does not come on, set the ignition
switch to "OFF" and carry out the following
FUEL LEVEL INDICATOR LIGHT TESTING
dures.
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Section 06 ELECTRICAL SYSTEM
Low Fuel Level Indicator Light Testing
To test the low fuel indicator light, carry out the
following procedures.
Remove the dashboard, refer to the
tion.
Disconnect the two wires from the indicator light.
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Measure for continuity through the light bulb. You
should measure approximately 22 ohms.
If the light bulb does not test good, replace the
low fuel level indicator light. Refer to
INDICATOR LIGHT
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Measure the ground circuit continuity through the
sensor to chassis ground as per following table.
LOW FUEL LEVEL SENSOR RESISTANCE TEST
PROBE POSITIONS
BROWN/PINK
wire terminal
at light
LOW
proce-
Subsection 04 (LIGHTS)
BODY
NEUTRAL
in this section.
RESISTANCE AT
20°C (68°F)
Chassis
1000 ± 150
ground
sec-
267