Page 361 - Manual Oficina Polaris Sportsman 570 2014 a 2016

FUEL SYSTEM

ENGINE COOLANT TEMPERATURE SENSOR (ETC)

ECT SENSOR - 325

4

RESISTANCE VS. TEMPERATURE TEST

CAUTION
ECT SENSOR - 570
Contact with boiling water or steam may cause burns.

1. Disconnect the ECT from the main harness.
2. Remove the ECT.
3. Fill a pot of water 1/2 way with water.
4. Place a pot of water on a hot plate.
5. Place the sensor / tip of a thermometer in the water,
ensure the display is legible as you will reference the
thermometer throughout the test.
6. Safely position the ETC so that the sensor is
submerged in water from the threads down and the
connector may be readily probed.
NOTE

ECT OVERVIEW Use a wire or other type of prop to ensure the sensor is
properly supported and the tip of the sensor is touching
Mounted on the cylinder head, the engine temperature water only.
sensor measures coolant temperature. The engine
temperature sensor is a Negative Temperature
Coefficient (NTC) type sensor, as the temperature
increases, the resistance decreases. This signal is
processed by the ECU for determining the fuel and
ignition requirements during operation. The ECU also
uses this signal to determine when to activate the fan.

ECT SENSOR TEST
SYSTEM OPERATION TEST
To quickly rule out other components and wiring related
to the ECT, disconnect the harness from the ECT sensor
and start the engine. After a few seconds, the fan should
turn on and the “Check Engine” indicator should display
on the instrument cluster. This indicates all other
components are working properly.

9926803 R06 - 2014-2016 Sportsman 325 / ETX / 450 HO / 570 Service Manual 4.45
© Copyright Polaris Industries Inc.