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COOLING SYSTEM
FAN CONTROL CIRCUIT OPERATION /
TESTING
Power is supplied to the fan via the Orange/Black wire
when the relay is ON. The ground path for the fan motor
is through the Brown harness wire. Refer to Relay
Operation, page
later in this chapter for more
information on fan functions.
CAUTION
Keep hands away from fan blades during operation.
Serious personal injury could result.
NOTE
The fan may not function or operation may be delayed if
coolant level is low or if air is trapped in the cooling
system. Be sure cooling system is full and purged of air.
FAN CONTROL CIRCUIT BYPASS TEST
1. Disconnect
harness
from
sensor on the engine cylinder head (see Engine
Coolant
Temperature
outlined in this chapter).
2. With the transmission in Park, start the engine. After
a few seconds, the fan should start running and the
"Check Engine" indicator should display on the
instrument
cluster.
This
components are working properly.
3. If the fan does not run or runs slowly, check the fan
motor wiring, ground, motor condition, circuit breaker
and mechanical relay for proper operation. Repair or
replace as necessary. If the fan runs with the sensor
harness disconnected, but will not turn on when the
engine is hot, check the coolant temperature sensor
and connector terminals.
9928492 R04 - 2017-2018 RZR XP 1000 / XP4 1000 Service Manual
© Copyright Polaris Industries Inc.
coolant
temperature
Sensor
(ECT)
Overview
indicates
all
other
ENGINE COOLANT TEMPERATURE
SENSOR (ECT) OVERVIEW
Mounted in the thermostat housing, the engine
q
temperature sensor
measures coolant temperature.
The
engine
temperature
Temperature Coefficient (NTC) type sensor, as the
temperature increases the resistance decreases.
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.
Polaris dealers can test the sensor by using Digital
Wrench® Diagnostic Software (dealer only).
ELECTRICAL
sensor
is
a
Negative
11
11.51
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Table of Contents
Troubleshooting
