Fan Control Circuit Operation / Testing; Fan Control Circuit Bypass Test; Coolant Temperature Sensor; Efi Diagnostics - Polaris 2013 RANGER RZR S 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 "RELAYS"
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. Refer to Chapter 2 "Maintenance"
for cooling system information.

Fan Control Circuit Bypass Test

1. Disconnect harness from coolant temperature sensor
on the engine cylinder head (see Chapter 4 for
location).
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.
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.

Coolant Temperature Sensor

The coolant temperature sensor can be tested using an
ohmmeter or voltmeter.
1. With the engine and temperature sensor at room

temperature (68 F = 20
2. With the meter in the ohms mode, place the meter
leads onto the sensor contacts.
3. Use the table Temperature / Resistance table to
determine if the sensor needs to be replaced.
T °F (°C)
EMPERATURE
° °
68 F (20 C)
° °
212 F (100 C)
NOTE: If the coolant temperature sensor or circuit
malfunctions the radiator fan will default to 'ON'.
This indicates all other

C), disconnect the harness.
R
ESISTANCE
2.5 k 
±
6%
186 
±
2%
9924125 - 2013 RANGER RZR / RZR S / RZR 4 Service Manual
© Copyright 2012 Polaris Sales Inc.

EFI DIAGNOSTICS

EFI Component Testing
All EFI component information and diagnostic testing
procedures are located in Chapter 4.
Refer to Chapter 4 "Electronic Fuel Injection System (EFI)"
when diagnosing an EFI system or component.

FUEL SENDER

Testing
1. Drain the fuel tank and remove it from the vehicle
(see Chapter 4).
2. Set the fuel tank on a flat surface. Using an Ohm
meter, measure the resistance of the fuel sender as
shown below.
3. Allow the sender float to sit in the empty position and
compare to specification.
Fuel Sender - Empty: 90 ± 4.5 
4. Slowly tilt the tank so that gravity moves the sender
float to the full position and compare to specification.
Fuel Sender - Full: 6 ± 1 
5. If the readings are out of specification, or if the reading
is erratic or LCD display "sticks", check the following
before replacing the fuel pump assembly:
• Loose float
• Float contact with tank
• Bent float rod
If none of the conditions exist, the fuel sender assembly is
faulty. Replace the fuel pump assembly (see Chapter 4).
ELECTRICAL
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