Cooland light flashing check system code

Backwoods M Max

Backwoods M Max

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My 02 mountain max started flashing the check coolant light while putting it away last time, and intermittently today. Has been almost steady on the ride out of the mountains today. Where do I start for diagnostics. Change the sensor first and go from there?

Thanks guys
 
check your wiring for rub thrus quite common




Backwoods M Max said:
My 02 mountain max started flashing the check coolant light while putting it away last time, and intermittently today. Has been almost steady on the ride out of the mountains today. Where do I start for diagnostics. Change the sensor first and go from there?

Thanks guys
Click to expand...
 
It is flashing 3 half second blinks followed by a rest period. The book says there is an error in the high temp alarm system and to diagnose. The only other light pattern is the 1/4 second blink continuous which is for overheat.

Where should I look for rub through? It is kind of sketchy that the wires are bundled to the coolant hose with that spring on it......
 
check the wires entering the plug atop the head for the temp sensor. wiggle it or play with the wires and see if the light stops.

i have seen several of these sleds lose contact at the plug or even wires break where they enter the plug. wiring appears normal, but its not.
 
snowdad4 said:
check the wires entering the plug atop the head for the temp sensor. wiggle it or play with the wires and see if the light stops.

i have seen several of these sleds lose contact at the plug or even wires break where they enter the plug. wiring appears normal, but its not.
Click to expand...

Thanks I will look there in the morning. Like I said, it was intermittent. I stopped on the trail for a precautionary cool down and looked at the wires. The connector harness was quite tight at the plug and the main harness was bent in an odd way where it was secured to the coolant hose. I undid the ties and relocated the wires to something else. After that it would be very intermittent on the light the rest of the ride out. Sometimes it would go 4-5 minutes then start to flash again.
 
I checked the lead and have 5v at the pigtail with the engine running and the lead disconnected. Also changes the pattern to 4 quick then a break. The ground at the lead is good I can get 12.7v going ground to battery with the engine off. I would think its the sensor especially if the pattern is changing when I unplug it. Any thoughts guys?
 
If its similar to mine. Remove the handle bar harness cover. I had mice move in one year (penthouse lodgers!) wires chews along with insulation. I had mine turn on this year. I taped a questionable wire and it did not occur again.
 
I stopped at the local yamaha dealership on the way home and picked his brain. From the yamaha tech manual it says the 3 blink pattern is a problem with the grip/thumb warmer. He said the owners manual is vague on purpose to get them machine into the dealership. Come to think of it, my grip heaters don't really work at all. I wonder if I tore the heating element tearing them off my old bars to reuse them with the new bars.
 
just for clarity, the 4 flash sequence is for your thumb warmer, the three flash is associated with the temp sensor.

may have been an oversight or typo on your last post but i thought i would clarify for others that may be following along.
 
That's the opposite of what I have been told and seen. The yamaha manual says 3 flashes for thumb warmer. 4 flashes for temp sensor, which is what I was being shown when the sensor is unplugged. Maybe the code signals have changes over the years, my machine is an 02.
 
lets agree to disagree.

fact being, for the sleds with 300 watt ignitions built 2001 and after, including the sx, vx, vt, and mtn max and excluding vipers and 4 strokes, the following codes apply:

three flash pattern showing .75 second flash with .25 second between = thumb warmer switch circuit.

four flash pattern with the same intervals as above = thumb warmer itself.

one single .75 second flash followed by three .25 second flashes with .25 second between the flashes is the coolant temp sensor and or circuit. on this code, it appears more as a 3 flash code to me because the quick three flashes catch my eye more so than the first flash.

this info is readily available in any of the yamaha service manuals along with the technical manuals as well as listed in the ty tech section.
 
I just got ahold of the manual for a 2001 mountain max 700. Now that I know what it was, when I had the sensor unplugged I was seeing the single long and 3 short flash. It was hard to distinguish at the time not knowing what the pattern would look like. That being said, what I am seeing is the .75 second flash 3 times with the rest period. I am changing my grip heaters because they do not work hardly at all, and I fear that I may have damaged them removing them from my old bars, or riding on them this year after the glue broke free and having them twist while on. Either situation could have killed the grip. I also extended the harnesses for the new bars, and while I did use high quality heat seal connectors, it's not impossible that a wire broke, because I was surprised how frail the grip heater wire was.
 
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