Page 482 - Manual Oficina Polaris RS1 2018 e 2019

ELECTRICAL

COOLING SYSTEM ENGINE COOLANT TEMPERATURE
SENSOR (ECT) OVERVIEW
FAN CONTROL CIRCUIT OPERATION
Mounted in the thermostat housing, the engine
The RZR RS1 utilizes a rear mounted radiator cooling temperature sensor q measures coolant temperature.
system with dual fans. The fans are on/off single speed, The engine temperature sensor is a Negative
and they run independently of each other. Temperature Coefficient (NTC) type sensor, as the
temperature increases the resistance decreases.
FAN FAN ON FAN OFF
TEMPERA- TEMPERA-
TURE TURE
Left Fan 198.1° F (92.3° 195.4° F (90.8°
C) C)

Right Fan 203.5° F (95.3° 196.7° F (91.5°
C) C)

FAN CONTROL CIRCUIT BYPASS TEST
1. Disconnect harness from coolant temperature
sensor on the engine cylinder head (see Engine
Coolant Temperature Sensor (ECT) Overview
outlined in this chapter).
Coolant passes through the thermostat housing and by
2. With the transmission in Park, start the engine. After
a few seconds, the fan should start running and the the sensor probe, varying a resistance reading which is
“Check Engine” indicator should display on the relayed to the ECU. This signal is processed by the ECU
instrument cluster. This indicates all other and compared to its programming for determining the
components are working properly. fuel and ignition requirements during operation. The ECU
also uses this signal to determine when to activate the
3. If the fan does not run or runs slowly, check the fan cooling fan during operation.
motor wiring, ground, motor condition, circuit breaker
and mechanical relay for proper operation. Repair or ECT SENSOR TEST
replace as necessary. If the fan runs with the sensor
harness disconnected, but will not turn on when the To quickly rule out other components and wiring related
engine is hot, check the coolant temperature sensor to the ECT, disconnect the harness from the ECT sensor
and connector terminals. 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).

11.34 9928689 - 2018 RZR RS1 Service Manual
© Copyright Polaris Industries Inc.