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ELECTRICAL
10.14
COOLANT TEMPERATURE
SENSOR
The coolant temperature sensor can be tested using an
ohmeter or voltmeter.
1. With the engine and temperature sensor at room
temperature (68° F=20° C), disconnect the
harness connector.
2. With the meter in the ohms mode, place the meter
leads onto the sensor contacts. One lead on
Yellow wire and one lead on the Violet wire.
3. Use the table Temperature / Resistance table to
determine if the sensor needs to be replaced.
Temperature °F(°C) Resistance
68°F(20°C)
2.5 kΩ ± 6%
212°F (100°C)
0.186 kΩ ± 2%
NOTE: If the coolant temperature sensor or circuit
malfunctions the radiator fan will default to ’ON’.
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 Maintenance Chapter 2 for
cooling system information.
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
page 10.20 for more information on Fan Relay
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 Maintenance Chapter 2 for
cooling system information.
FAN CONTROL CIRCUIT
BYPASS
TEST
1. Disconnect harness from coolant temperature
sensor on engine.
2. With the ATV in “Park” and with the parking brake
on, turn the ignition key (and engine stop switch)
“ON”. The fan should start running.
3. If the fan doesnot run or runs slowly,check thefan
motor wiring, ground, motor condition and
mechanical relay for proper operation (refer to
’Fan Motor Current Draw’ this section). 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.
FAN MOTOR CURRENT DRAW
A current draw test will provide a goodindication of fan
motor condition. A worn or damaged fan motor will
draw more current, which causes a reduction in blade
speed and reduced cooling.
Fan Motor
Connect ammeter
between Or/Blk pins
Or/Blk
Fan
Harness
Or/Blk
Brn
1. Disconnect the harness from the coolant sensor.
2. Connect a DC ammeter in between the fan switch
harness wires as shown.
3. Be sure fan blade is free to rotate.
4. Turn ignition key and engine stop switch to “ON”
position. Read the current draw on ammeter with
fan running.
5. If the fan motor draws more than 15 Amps,
replace the motor.
Fan Motor Current Draw:
Should Be Less Than 15 Amps
NOTE: This fan motor current draw specification only
applies to Sportsman EFI models.