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Hey guys,

Been trying to troubleshoot an issue on my 2013 Versys 650. While riding, the coolant like will flicker on and off. I noticed that when I hit bumps/rev the engine, it will flicker with these vibrations. I recently flushed the coolant and my radiator fan comes on in stop and go traffic, so I am not concerned that it is overheating. Also, the light comes on sometimes when the bike is parked. I also checked the coolant temperature sensor wiring/resistance. I was getting 5 volts at the connection, the ground had continuity with the engine ground, and I even placed a 200 ohm resistor across the connector to mimic the sensor (would mimic safe operating temperature) - the water temp warning light on the dash still did go out.

I would think it is not the ECU causing the issue as everything else seems to be working fine. The only other thing I can think is something loose in the wiring/connections inside the speedo gauge itself.

Please let me know if there is anything I can check or look for!
 

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make sure the temp sensor isn't faulty.

You need to find the bare spot on the coolant temperature sensor's orange wire from the ECU where it's grounding out on the chassis, or engine, etc.
Good advice right there! Faulty or intermittent grounding has caused more issues than I care to think about.

I'd also check to make sure that your temp sensor hasn't gone bad or is loose. (I'm pretty sure somebody out there has a test for that, I have no idea what it is offhand, I think you check with an ohm meter, but don't quote me on that.)

If nothing else, just replace it. I don't think they're THAT expensive.

Edit: see: https://www.google.com/imgres?imgurl=http://repairguide.autozone.com/znetrgs/repair_guide_content/en_us/images/0900c152/80/1b/fc/49/medium/0900c152801bfc49.gif&imgrefurl=https://www.autozone.com/repairguides/Volkswagen-Cars-2000-05/Coolant-Temperature-Sensor/Testing/_/P-0900c152801bfc48&h=398&w=500&tbnid=6Q8uBN56HfQFhM:&q=check+temperature+sensor&tbnh=160&tbnw=201&usg=__m_nLj7kqxOIFNC0vWDsGxRbg0hs%3D&vet=10ahUKEwj95Kzmm7_bAhVL1lMKHSIuA_MQ9QEIowEwAA..i&docid=LOmTmPTYb10l9M&sa=X&ved=0ahUKEwj95Kzmm7_bAhVL1lMKHSIuA_MQ9QEIowEwAA
 

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What we are actually looking for here is an intermittent SHORT TO GROUND that is caused by partially exposed wire of the water temperature sensor circuit which is making contact with chassis or engine somewhere between ECU and sensor.
 

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Discussion Starter #6
Guys,

Thanks for the feedback. I followed the wiring back from the coolant sensor to the ECU and I didn't find any bare spot yet, but I did notice the previous owner must have zip tied the wiring harness way to tight to the frame. The zip tie was basically cutting into the wire harness. I cut each zip tie and replaced it with a couple that were not as tight. The light has been off since but I will tear the bike apart further to make sure there is no bare spot in the wiring.

Thank you for the responses!
 

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Guys,

Thanks for the feedback. I followed the wiring back from the coolant sensor to the ECU and I didn't find any bare spot yet, but I did notice the previous owner must have zip tied the wiring harness way to tight to the frame. The zip tie was basically cutting into the wire harness. I cut each zip tie and replaced it with a couple that were not as tight. The light has been off since but I will tear the bike apart further to make sure there is no bare spot in the wiring.

Thank you for the responses!
The single biggest thing I fear (aside from "I'm here to help.") is factory wiring that's been somehow 'diddled'. That is one of the scariest things to isolate and repair on the planet - especially on newer machinery...
 

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Upon closer inspection of the wiring where it was tied too tightly, some small cracks or compressed areas in the wire insulation where the current was allowed to jump to frame or other wires may be revealed.
 
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