4.31
ELECTRONIC FUEL INJECTION
4
9923523 - 2012 RANGER RZR 570 Service Manual
© Copyright 2011 Polaris Sales Inc.
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 Negative Temperature Coefficient
(NTC) typ e se nsor, as the temperature increases the
resistance decreases.
Coolant p asses through the cylin der and by the sensor
p
robe, 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 the fu el an d ign ition
requirements d uring operation. The ECU also uses th is
signal to deter mine when to a ctivate the 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.
Refer to Chapter 10 for additional ECT sensor information.
Po
laris dealers can test th e se nsor b y using the Digital
Wrench™ Diagnostic Software (dealer only).
ECT
PVT Outlet Hose Removed
ECT Sensor Resistance Readings
Temperature F (C) Resistance
68 F (20 C) 2.5 k ± 6%
86 F (30 C) 1.7 k ± 6%
104 F (40 C) 1.2 k ± 6%
122 F (50 C) 834 ± 6%
140 F (60 C) 596 ± 6%
158 F (70 C) 435 ± 6%
176 F (80 C) 323 ± 6%
194 F (90 C) 243 ± 6%
212 F (100
C) 186 ± 6%
To Next Page
Loading...
Need help?
General
