Fan Motor Tests; Fan Motor Current Draw - Polaris 2005 SPORTSMAN 500 Servise Manual

SPEEDOMETER
TROUBLESHOOTING CONT'D
TEST 7 - - - - RESET SPEEDOMETER
If the key switch or engine stop switch is turned off with
the vehicle in motion, the speedometer indicator
needle may stick, indicating the speed at which the
vehicle was traveling when the speedometer lost
power. For example: If the ATV was traveling 30 mph
when the engine stop switch is turned off, speedo may
indicate 30 mph until reset:
1. Operate vehicle at a speed greater than indicated
on speedometer (past point where needle is stuck).
Needle should return to normal operation.
2. In the above example, the ATV speed would have
to exceed 30 mph to reset.

FAN MOTOR CURRENT DRAW

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.
Or/Blk
Connect ammeter
to Or/Blk in series
1. Disconnect the harness from the fan motor.
2. Connect a DC ammeter in between the fan switch
harness wires as shown.
3. Verify fan is free to rotate. Turn ignition key and
engine stop switch to "ON" position. Read the
current draw on ammeter with fan running.
4. If the fan motor draws more than 8.8 Amps,
replace the motor.
Fan Motor Current Draw:
Less Than 8.8 Amps
Fan Motor
Or/Blk
Brn
COOLANT TEMPERATURE
SENSOR (THERMISTOR)
TEST
If the thermistor circuit is open the engine Hot light and
fan will both come on. With engine cold, disconnect
lead and measure resistance of sensor between the
two Yellow/Black connector terminals. There should
be no continuity or very high resistance (see chart
below).
See "Engine Temperature Controller" on Page 10.5
for information on thermistor operation.
SITUATION OHMS
READING
Hot light ON & Above 50k
Fan ON
Hot light ON Below 178
THERMISTOR READING DURING OPERATION
Condition Approx. Reading
(Min- -Max)
Hot Light 178Ω -- 190Ω
On
Fan Off 296Ω -- 316Ω
Fan On 236Ω -- 251Ω
FAN CONTROL CIRCUIT
OPERATION / TESTING
The fan is controlled through the ECM and thermistor.
Refer to "Engine Temperature Controller" on Page
10.5 for fan operation information.
"COOLANT TEMPERATURE
ELECTRICAL
DIAGNOSIS /
ACTION
Open Thermistor /
Replace Thermis-
tor
Engine Overheat
or Bad Thermistor
Temperature
215° F
(102° C)
180° F (82° C)
195° F (91° C)
Also refer to
SENSOR
10.15