4.24
9850045 R01 - 2020-2021 RANGER 1000 Service Manual
© Copyright Polaris Inc.
ENGINE COOLANT TEMPERATURE SENSOR (ECT)
ECT OPERATION OVERVIEW
Mounted in the cylinder head, 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.
Coolant passes through the cylinder head 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
cooling fan during operation.
ECT SENSOR REPLACEMENT
CAUTION
It is recommended to allow the vehicle to sit for 1 hour
after key off to allow the coolant to cool and fuel
pressure to drop.
1. Lift the rear cargo box to the raised position.
2. Drain the coolant so the level is below the sensor.
Refer to Coolant Replacement page 2.38.
3. Remove the fuel line from fuel rail. Refer to Fuel Line
Quick Connect Removal page 5.6.
4. Disconnect the vehicle harness
q
from the ECT
sensor.
5. Using a wrench, loosen and remove ECT sensor from
engine.
6. Apply thread sealant to the new sensor threads and
install it into the cylinder head.
7. Torque the new ECT sensor to specification and
connect the vehicle harness to the sensor.
TORQUE
ECT Sensor:
16 ft-lbs (22 Nm)
8. Reconnect the fuel line to the fuel rail. Refer to Fuel
Line Removal / Installation.
9. Ensure fuel line is properly attached by gently pulling
back on the quick connector.
10.Add the required amount of coolant and bleed the
system. Refer to Cooling System Bleeding
Procedure.
11. Turn the key on to pressurize the fuel system.
IMPORTANT
Ensure no leaks are present at the fuel line to rail
connection.
ENGINE ELECTRICAL
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