Coolant Temperature Indicator Testing; Lamp Circuit Test; Temp Light Temperature Sensor Test; Coolant Temperature Sensor - Polaris INDY TRAIL RMK Service Manual

ELECTRICAL

Coolant Temperature Indicator Testing

Circuit
Power
Yel
In
The indicator light is controlled by a temperature/warning switch installed into the engine cooling system. When
engine coolant temperature reaches approximately 205° F, the switch closes, completing the circuit through the
indicator light to ground. The system should be tested periodically for proper operation.

Lamp Circuit Test

1. Remove wire from temperature sensing switch located under thermostat housing.
2. With engine idling, ground wire to engine. The temperature warning lamp on the console should light. If not,
replace the lamp assembly or inspect wiring for shorts or open circuit.

Temp Light Temperature Sensor Test

The temperature/warning switch is normally open.
1. Set the multitester on the ohms (W) scale.
2. Disconnect the lamp wire.
3. Connect one test probe to the switch terminal and the other to engine ground. The meter should show an open
circuit (OL). This indicates a normally open switch. If the switch were heated to approximately 205° F, the
contact in the switch would close and the reading would be less than .4 ohms.
CAUTION:
If attempting to heat the sensor to close the contacts, heat only in a water bath. Never subject the sensor to an
open flame to attempt to close the contacts as sensor damage will result.

Coolant Temperature Sensor

The temperature sensor works in conjunction with the throttle position sensor, (TPS), and CDI controller. The
CDI has the ability to retard ignition timing whenever engine temperature exceeds a given set of parameters at
specific RPM ranges.
Because of the three inputs the temperature indicator light and ignition timing depend on, there is no one given
specification to when the temperature warning light or ignition limiting function will activate.
Coolant Temperature Sensor Testing
Temperature Sensor
Temperature
20°C / 68°F
100°C / 212°F
9.20
Temp
Resistance
2432±250W
192±30W
Blk/W
Ground the Black/White wire
(with the engine running) to test
the light.
Engine
Ground