Fan Motor Current Draw - Polaris 2009 Trail Boss 330 Service Manual

FAN MOTOR CURRENT DRAW

Connect ammeter leads
between exposed
Orange/Black terminals at
fan connection.
Connect only the Red/White
terminals at fan connection.
A current draw test will provide a good indication of fan
motor condition. A worn or damaged fan motor will
draw more current, which causes a reduction in blade
speed and reduced cooling.
1. Turn key to off.
2. Disconnect the thermistor.
3. Reconnect fan motor connector to place a DC
ammeter in series as shown in the Illustration.
4. Be sure fan blade is free to rotate.
5. Turn ignition key and engine stop switch to "ON"
position. Read the current draw on ammeter with
fan running.
6. If the fan motor draws more than 7.5 Amps,
replace the motor.
Fan Motor Current Draw:
Less Than 7.5 Amps
OIL COOLER FAN CONTROL
TEST
Oil Cooler Fan Notes
GThermistor resistance decreases with
temperature increase
GBoth fan and hot indicator should be on
with the thermistor unplugged
GFan blade should rotate drawing air in
through cooler (blowing on engine)
Ammeter
Temperature
Battery Voltage
RED/W
RED/W
Thermistor / Fan Control Test
GTurn key switch to ON and engine stop
GTest voltage on R/W wire at vehicle control
GDisconnect thermistor leads from the main
GTest the resistance of the thermistor (refer
to temperature/resistance table).
GReplace vehicle control module and test
THERMISTOR RESISTANCE
VS. TEMPERATURE
Oil Resistance
± 20%
77° F 100KΩ
(25° C)
240° F 3.5KΩ
(116° C)
260° F 2.5KΩ
(127° C)
290° F 1.6KΩ
(143° C)
Oil Cooler Fan Circuit
'HOT' indication and fan 'ON' with resistor
leads disconnected from module and key on
YEL/BLK
OR/BLK
Power
Control
Module
Indicator
BLU/W
R/W
switch to RUN. Do not start engine.
module. R/W wire should have 12--14
Volts DC (battery voltage)
harness (Black/Yellow wires) - Fan and
Hot indicator ON?
speedometer, fan motor and circuit)
Replace thermistor if out of specified range.
See the wiring diagram or chart for
thermistor resistance values at various oil
temperatures. The resistance of the
thermistor is approximately100kΩ at 77°F.
system if all else appears okay.
ELECTRICAL
Fan Hot Light
ON/OFF ON/OFF
Fan OFF
OFF
Fan OFF
OFF
Fan ON OFF
Fan ON Hot Indi-
cator ON
BLK/YEL
BLK/YEL
YEL/BLK
THERMISTOR
BRN
(If not, test
10.11