Strange Fan Problem By ganeca (Read 730 times)

[ganeca]

Hi,

i have a Jonway 250cc. The problem is when i start up the engine everything is ok, but the moment i get ot the scoot the fan starts, when i stand up i stops.  When i apply pressure to the back of the scoot it acts as a start button for the fan. It does the same thing when it is hot. Sometimes the fan swithes off when riding but vary rarely. Any ideas where to start looking for a solution.

Thank you in advance

[alleyoop]

Well it is obvious that one of the wires to the fan is getting pulled when you sit on it so follow the wires from the fan one will will be a ground and the other will go to the TEMP SENSOR on the motor. If that is all good then follow the wire from the SENSOR to wherever it goes and that should be it.
Alleyoop

[JR]

Vertical or Horizontal engine? Fuse box? If it has the fuse box look there also. Very common for wires in the fuse box to be crossed in a way that sitting down on the seat could send voltage to the fan for the main ignition hot wire to the fuse box.

JR

[ganeca]

I think it is the vertical engine version.
I will check the fuse box.
Can i get to the fan wire without taking the whole scoot apart.

[ellpee]

You don't specify a model year, but it's probably similiar, if not identical, to my 2011 Roketa, in which case yes, it will have a fusebox under the seat, and no, you won't be able to get at those wires without removing some plastic. Sorry to be the bearer of that bad news. The price we pay for looking all cool and aerodynamic on the road.

[ganeca]

The model is Jonway Ranger 2008. I have a fuse box next to the battery.

I looks like this. There is a fuse for fan switch but the strange thing is the fan stops when the brake light fuse is removed.

[fflintstone]

Not to go off topic ,but you have a common problem with all the new electronics nowadays--I have dialed my phone with my butt--and moved it to my front pocket and dialed it there--don't ask--so ,alleyoop and JR has just about figured out your problem--look for the wire going to the switch--good luck,fflintstone

[ellpee]

Ah, then you may be homing in on the problem. Reading the little label in your picture it looks like your wiring may be a bit different from my Roketa. On mine the four fuses are for (1) fan, (2) turn signals, (3) horn/gauges/brake lights, and (4) lights only when engine is running. Don't remember the exact physical order inside the fusebox. On yours it looks like the intention, at least, was to have the turn signals combined with horn and gauges and the brake lights on their own separate fuse.

In any event, you need to determine for sure which fuse is for what.

(1) Pull all the fuses and check them with a multimeter; the OEM Chinese fuses can look good and still be bad. Also be aware that OEM fusebox is junk, the slots can slide down out of position and result in poor/no connection. (I replaced mine with a reasonable-quality US fusebox from AutoZone; a bit tedious getting at all those wires underneath, but worth the effort.)

(2) With fuses removed, turn on the key and check each slot for 12v. Three should have it, one not (only active when engine is running). If you don't find three "live" slots, bad wire between ignition and fusebox.

(3) By trial and error, insert a fuse into each slot and try to toot the horn. When it toots you've found that circuit, which should also (according to your little label) allow the gauges and turn signals to operate. Confirm that, and make a note.

(4) Repeat with the remaining two 12v slots, this time trying the brake lights. When you find the one that allows them to work, make a note.

(5) The remaining 12v slot has to be the one for your fan.

I'm guessing that what you find is not going to agree with the little label; if that's the case, make a new, correct label, put all the fuses back in (watch out for those slipping slots!), and see what the situation is now with your fan.

[alleyoop]

Since it happens when you sit on it do this, it has to be a wire unneath the FUSE box so start it up and with your hand go under the fuse box and touch the wires and giggle them I will bet you will find it right away. Don't forget when you sit on it that hold part moves down.

[ganeca]

Found the issue. The metal frame holding the radiator and fan was broken on the right side ( bad welding) and the whole unit was moving back and forth. The lower cable going in to the fan sensor was touching the metal spring shield of the cooler hose a made a short circuit. Tomorrow i will check all the fuses just in case. Thank you all for the help

[ellpee]

Yikes, finding a serious frame weld problem is not trivial. That being said, the wires associated with the whole fan circuit are SUPPOSED to be insulated, so if the shifting of the not-perfectly-welded frame was causing a short circuit, you have two things to fix, seems to me. By all means get that frame weld fixed, but then the electrical problem still needs to be resolved.

[ganeca]

I isolated the plugs to the sensor, and today is welding day.