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FUEL SYSTEM / FUEL INJECTION
4.17
ENGINE TEMPERATURE
SENSOR
Mounted on the cylinder, the engine temperature
sensor measures coolant temperature. The engine
temperature sensor is a Negative Temperature
Coefficient (NTC) type sensor, as the temperature
increases the resistance decreases.
Engine Temperature Sensor
Refer to Chapter 10 for testing. Standard resistance
readings according to temperature:
Temperature °F(°C) Resistance
68°F(20°C)
2.5 kΩ ± 6%
212°F (100°C)
0.186 kΩ ± 2%
Coolant passes through the cylinder and by the
sensor probe, creating a resistance reading which is
relayed to the ECU. This signal is processed by the
ECU and compared to it’s programming for
determining the fuel and ignition requirements during
operation. The ECU also uses this signal to determine
when to activate the fan during operation. If for any
reason the engine temperature sensor circuit is
interrupted, the fan will default to ’ON’.
ENGINE TEMPERATURE SENSOR TEST
Refer to Chapter 10 for testing. Polaris dealers can also
test the sensor by using the Polaris Digital Wrench
t
Software (dealer only). Refer to the Digital Wrencht
Software Manual for more information.
ENGINE TEMPERATURE SENSOR
REPLACEMENT
1. Disconnect sensor from engine harness.
2. Using a wrench, remove and replace the sensor,
applying a light coating of thread sealant to aid
installation.
3. Torque the sensor to 18.5 ft. lbs. (25 Nm)