Static Thermistor Test; Dynamic Thermistor Test; Hot Lamp Test - Polaris Ranger 500 2x4 2007 Service Manual

Static Thermistor Test

This test should be conducted with the engine near room temperature. Measure the resistance between
Test Procedure the two yellow/black wires on Pins E and F of SSCB #1 . The thermistor resistance should be 2200-2700
ohms when the engine is at room temperature.
What does passing A resistance between 2200-2700 ohms indicates the thermistor is functioning normally and the connection
this test indicate? with the thermistor is in good condition.
If an open or short circuit is found, this test should be repeated between the two yellow/black wires at the
What does failing thermistor connector leading directly into the thermistor. An open or short here means there is a problem
this test indicate? inside the thermistor and it must be replaced. If no short or open is found here, the problem is in the yellow/
black wires between the PDM and thermistor.

Dynamic Thermistor Test

To perform this test, the thermistor will need to be removed from the unit. Place an appropriate container
on a hot plate, add enough water to the container to submerge a thermistor; begin to apply heat. Place the
thermistor and a thermometer in the water. As the water heats, measure the thermistor resistance. To pass
Test Procedure
this test, resistance should be 622Ω - 760Ω at 131
- 240Ω at 203
What does passing
Thermistor resistance within specification at each temperature indicates normal operation.
this test indicate?
What does failing If the thermistor resistance is is significantly out of specification at any of the above temperatures, it should
this test indicate? be replaced.

Hot Lamp Test

With the ignition switch on and the thermistor and indicator panel unplugged, Check for continuity from
Test Procedure
the Blue/white wire at the indicator panel to ground. There should be continuity to ground to pass this test.
The PDM is properly providing a ground path for the HOT LAMP. If the unit passes the test and the HOT
What does passing
LAMP will not illuminate with the indicator panel and PDM plugged in, and the thermistor unplugged,
this test indicate?
inspect the hot lamp bulb and indicator panel, and indicator power source.
If there is no continuity to ground, you may not be testing to a known good ground. There may be damage
What does failing to the blue/white wire or connections between the indicator panel and PDM. It is also possible that the
this test indicate? PDM may not be providing a proper ground path. Replace the PDM only after verifying a good ground
path, wiring harness, and connections.
Static Thermistor Test
Dynamic Thermistor Test
o o
F (95 C).
HOT LAMP Test
o o
F (55 C), 339Ω - 414Ω at 167
ELECTRICAL
o o
F (75 C), and 196Ω
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