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Temp Sensor Resistance Cold HS800 EFI (2014)

etimc

By etimc
in Hisun UTV SxS Forum

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etimc Rookie

etimc

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I suspect I have a faulty temp sensor but at the cost of the sensor plus 50 percent tariff plus the shipping cost to Costa Rica, i would like to confirm it - the Hisun 800 has 2 sensors - one in the radiator appears to be a fully open or fully closed bi-metal contact switch similar to the old household thermostats for your heating system. - My fans turn on and off automatically as they should and a jumper across the connector also triggers the fan - appears to be a simple logic circuit back to the computer that then trips a relay for the fans.  The second sensor is on the back cylinder almost hidden by the throttle body and idle control system - I have unplugged it, sprayed it with contact cleaner, checked the pins, tried to get a resistance reading across the sensor, reconnected it and still get a blinking red light on the display panel warning of high temperature - this occurs even when the buggy is still cold having just started it in the morning - I have not been able to trace out the other end of the cable on the display panel since it appears i will have to remove the entire front plastic to get to it - hoping i could confirm the resistance before i go to that step (this is the same buggy originally posted by Jim Magnuson last September when the spark arrestor overheated and burned the plastic pickup bed - I fixed that by removing and cleaning the spark arrestor and it has never glowed red again.  I would really like to put a guage in place of the digital idiot light since (from experience in automobiles) by the time the idiot light goes on you have already damaged the engine - Which brings the second question - would it be advisable to swap the front radiator sensor for a real sensor and then jumper the fans to always on condition at the connector so the computer contentedly thinks everything is working and it is doing its job ?

 

etimc Rookie

etimc

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More reading and research and I guess it appears that both sensors are full make/break contact switches and a third sensor in the MAF/MAP/Temp sensor is the one that is variable resistance - sooo - if my dash light is always on for overheat condition, then i guess i need to follow the wire and find where it might be grounding out.

 

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