Fan Motor Current Draw - Polaris SPORTSMAN 400 2003 Service 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.
COOLANT TEMPERATURE
SENSOR TEST (HOT LIGHT)
With the ignition switch (and engine stop switch) "ON",
power is delivered to the hot light via the Red/White
wire. The Blue/White wire (ground) out of the light
socket is connected to the coolant temperature
sensor on the cylinder head. In normal operating
conditions, the temperature sensor is non-conductive
(open). If engine coolant reaches the specified
temperature, the sensor becomes conductive
completing the ground path for the light.
With engine cold, disconnect lead and measure
resistance of sensor between connector terminal and
ground. There should be no continuity or very high
resistance (megohms).
Hot Light On
FAN CONTROL CIRCUIT
OPERATION / TESTING
The fan switch is located on the radiator. Power is
supplied to the fan switch via the Red/Black wire when
the ignition key is ON. When the fan switch reaches
the specified temperature, it becomes conductive and
sends power to the fan motor through to the
Orange/Black wire. The ground path for the fan motor
is through the Brown harness wire.
CAUTION: Keep hands away from fan blades
during this procedure. Serious personal injury
could result.
221° F (105° C)
NOTE: The fan switch 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 SWITCH
BYPASS TEST
1. Disconnect harness from fan switch on radiator.
2. Place a jumper wire between the Red/Blk and
Org/Blk wires in the connector.
3. With the parking brake on, turn the ignition key
(and engine stop switch) "ON". The fan should
start running.
4. If the fan runs with the jumper wire installed,
check the fan control switch and connector
terminals. If the fan does not run or runs slowly
with the jumper wire installed, check the fan motor
wiring, ground, and motor condition (refer to Fan
Motor Testing this section). Repair or replace as
necessary.

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.
Connect ammeter
to R/B and Or/Blk
Red/Blk
Fan
Switch
Harness
1. Disconnect the harness from the fan switch.
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.
ELECTRICAL
Fan Motor
Or/Blk
Or/Blk
Brn
10.11