Engine Coolant Temperature Sensor (Ect) - Polaris xp 2013 eps Service Manual

ENGINE COOLANT TEMPERATURE
SENSOR (ECT)
Operation Overview
Mounted in the thermostat housing, 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.
ECT
Coolant passes through the thermostat housing 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 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.
ECT Sensor
Refer to Chapter 3 and 10 for additional ECT sensor
information. Polaris dealers can test the sensor by using
Digital Wrench® Diagnostic Software (dealer only).
9924096 - 2013 RANGER RZR XP 900 / RZR XP 4 900 Service Manual
© Copyright 2012 Polaris Sales Inc.
ELECTRONIC FUEL INJECTION
Temperature °F (°C)
68 °F (20 °C)
86 °F (30 °C)
104 °F (40 °C)
122 °F (50 °C)
140 °F (60 °C)
158 °F (70 °C)
176 °F (80 °C)
194 °F (90 °C)
212 °F (100 °C)
ECT Sensor Replacement
1. Remove the cargo box access panel (A).
2. Be sure the engine has cooled enough to work on.
3. Remove the breather hose (B) from the air box and
loosen the hose clamps (C) retaining the air box to the
throttle body assembly.
B
C
Resistance
2.5k  ± 6%
1.7k  ± 6%
1.2k  ± 6%
834  ± 6%
596  ± 6%
435  ± 6%
323  ± 6%
243  ± 6%
186  ± 6%
4
A
4.21