Polaris Virage TX 2000 Service Manual page 242

ELECTRICAL
Temperature Warning - Virage TX / SLX / Pro 1200 / Genesis
Coolant Temperature Warning Circuit Operation
The MFD/MFI light is controlled by a temperature/warning switch installed into the engine cooling system. When
engine coolant temperature sensor reaches its "ON" temperature (see page 7.3) the switch closes, completing
the current flow from the wire harness through the MFD/MFI and to ground. The system should be tested periodi
cally for proper operation.
Temperature Warning Circuit Test
Warning light in MFD/MFI is activated when tempera
ture switch contacts are closed (overheat condition)
and ground path is complete. On Polaris engines, the
sensor is located on the exhaust manifold. Ground the
sensor wire from MFD/MFI with engine running to see
if temp light activates. Refer to MFD/MFI function/test
ing in this section.
Temperature Sensor Test
The temperature/warning switch is normally open. Us
ing a digital VOM set in the Ohms position, and with the
wires disconnected, contact one test probe to the
switch terminal and the other test probe to engine
ground. The meter should show an open circuit. Heat
the switch in a water bath to the "on" temperature listed
on page 7.3. Measure resistance of the switch. Read
ing should be less than .4 ohms.
CAUTION:
When testing the switch, heat only in a water bath. Nev
er subject the sensor to an open flame or sensor dam
age will result. Do not immerse the wires in the water
bath.
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