Fan Control Circuit Operation / Testing; Fan Control Circuit Bypass Test; Coolant Temperature Sensor - Polaris RANGER XP 900 2018-2019 Service Manual

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 11.30 later in this chapter for more
information on fan functions.
WARNING
Keep hands away from fan blades during operation.
Serious personal injury could result.
NOTICE
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. Refer to "ECT
Sensor Replacement"page 4.29 procedure.
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.
4. 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.
9929399 R01 - 2018-2019 RANGER XP/ CREW 900/1000 Service Manual
© Copyright Polaris Industries Inc.

COOLANT TEMPERATURE SENSOR

The coolant temperature sensor can be tested using an
ohmmeter or voltmeter.
1. With the engine and temperature sensor at room
2. With the meter in the ohms mode, place the meter
3. Use the Temperature / Resistance table to determine
If the coolant temperature sensor or circuit malfunctions
the radiator fan will default to 'ON' while the engine is
coolant temperature
indicates all other
temperature (77 °F = 25 °C), disconnect the harness.
leads onto the sensor contacts.
if the sensor needs to be replaced.
TEMPERATURE °F (°C)
RESISTANCE
77 °F (25 °C)
29.9 kΩ ± 6%
248 °F (120 °C)
1.22 kΩ ± 2%
NOTICE
running.
ELECTRICAL
11
11.25