Engine Coolant Temperature (Ect) Sensor; Operation Overview; Ect Sensor Test; Ect Sensor Replacement - Polaris Sportsman XP 1000 S 2020 Service Manual

ENGINE ELECTRICAL

ENGINE COOLANT TEMPERATURE (ECT) SENSOR

OPERATION OVERVIEW

The Engine Coolant Temperature (ECT) sensor
measures coolant temperature. It is a Negative
Temperature Coefficient (NTC) type sensor, as the
temperature increases the resistance decreases.
Coolant passes through the cylinder and by the sensor
probe, varying a resistance reading which is relayed to
the ECU. This signal is processed by the ECU and
compared to its 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.

ECT SENSOR TEST

To quickly rule out other components and wiring related
to the Engine Coolant Temperature (ECT) sensor,
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.
Polaris dealers can test the sensor by using the Digital
Wrench® Diagnostic Software (dealer only).
TEMPERATURE °F (°C)
32 °F (0 °C)
68 °F (20 °C)
176 °F (80 °C)
212 °F (100 °C)
4.24
RESISTANCE
5.9kΩ ± 5%
2.5kΩ ± 5%
323Ω ± 5%
186Ω ± 5%

ECT SENSOR REPLACEMENT

1. Remove the seat and both LH side panels.
2. Drain coolant to level below the Engine Coolant
Temperature (ECT) sensor.
3. Disconnect the wire harness from the ECT sensor.
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4. Remove the clamp
then pull the hose from the bottom of the thermostat
housing to allow enough access for ECT sensor
removal.
5. Remove and replace the sensor, applying a light
coating of thread sealant to aid installation.
6. Torque ECT sensor to specification.
TORQUE
Engine Coolant Temperature (ECT) Sensor
17 ft-lbs (23 N·m)
7. Reverse the previous steps to assemble the vehicle.
9931493 R03 - 2020-2021 Sportsman XP 1000 S Service Manual
from the coolant bypass hose,
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