Engine Coolant Temperature Sensor (Ect); Operation Overview; Ect Sensor Test - Polaris 2012 RANGER RZR 570 INTL Service Manual

ENGINE COOLANT TEMPERATURE SENSOR (ECT)

Operation Overview

Mounted on the cylind er hea d, th e en gine te mperature
sensor me asures coola nt temp erature. The eng ine
temperature sensor is a Ne gative T emperature Coefficient
(NTC) typ e se nsor, as the temperature increases the
resistance decreases.
ECT
PVT Outlet Hose Removed
Coolant passes thr ough the cylin der 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 pr ogramming for determining th e fu el an d ign ition
requirements during operation. The ECU also uses th is
signal to deter mine when to a ctivate the fan
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.
Refer to Ch apter 10 for additional ECT sensor information.
Polaris dealers can test th e se nsor b y using the Digital
Wrench™ Diagnostic Software (dealer only).
during
9923523 - 2012 RANGER RZR 570 Service Manual
© Copyright 2011 Polaris Sales Inc.
ELECTRONIC FUEL INJECTION
ECT Sensor
ECT Sensor Resistance Readings
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)
4
Resistance
2.5 k ± 6%
1.7 k ± 6%
1.2 k ± 6%
834  ± 6%
596  ± 6%
435  ± 6%
323  ± 6%
243  ± 6%
186  ± 6%
4.31