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Discussion Starter #1
Got a 06 Magnum 330. Turn key on and HOT and check engine flashes on the display. Jumpered 12 volts to oil cooler fan and it runs then jumpered connection to thermistor in oil cooler and fan doesn't run. Checked resistance of thermistor and its 76.0 ohms. Other forums claim Polaris has this problem with 04 and 05 Mags and did recall. Also was just gonna replace thermistor and part comes up as "not available". Also maybe that there is circuit breaker or fuse in the fan circuit or/and a PDM ECU ....can't find any info. Any help appreciated...either advice or electrical schematic. Any way to jumper over diagnostic plug or do these even have a way to pull fault codes out of the ECM or PDM or whatever its called. Know nothing about Polaris but can fix a Peterbilt or Western Star or Mack.
 

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Discussion Starter #3
Somewhat confused....service manual refers to solid state circuit breaker, ECM, engine temp controller and vehicle control module.....are these all one and the same. also seen it referred to as sure power box. Fan does not run with thermistor unplugged. Fan does run if jumpered to 12V direct so I know fan motor works. Boils down to $100 thermistor or $150 control box or whatever its called...???
 

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Yes - SSCB, ECM, SURE POWER and TEMP CONTROLLER are all descriptions of the same thing, but some people confuse ECM with CDI and those may be incorporated together on other vehicles especially EFI machines.

Just unplugging the thermistor will not turn on the fan - you have to short the thermistor leads together to fool the SSCB into thinking it's hot.

I attached the SSCB test pages from the service manual & hope it might be helpful
 

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Discussion Starter #5
so if I jumper the thermistor connector over (not the thermistor side) and the fan doesn't run....means bad ECM, temp controller whatever module...???
 

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Basically yes - shorting between the thermistor wires to turn on the fan and temp light is a quick test of the thermistor - if shorting between the two wires causes the fan and light to operate then the thermistor is bad - if the fan and/or light come on with the thermistor unplugged, then the ECM is bad.
 
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