Fan switch question - Honda RC51 Forum : RC51 Motorcycle Forums
 
LinkBack Thread Tools Display Modes
post #1 of 4 (permalink) Old 09-02-2016, 07:59 PM Thread Starter
bpw
Senior Member
 
Join Date: Sep 2014
Posts: 355
Mentioned: 0 Post(s)
Quoted: 31 Post(s)
Fan switch question

Hey guys sorting out some gremlins over here. My fan switch has never worked on my bike since I bought it. (sp2) So I ran a manual switch and thats been fine. However I just rewired the whole bike and fixed a few other electrical issues and I believe fixed the fan temp switch issue. My question is as follows. Is there a way I can test to see if it's going to kick on when it gets warm without getting it warm?

I ask because it's apart right now and if I need to re run a manual switch now would be a good time, as opposed to assembling and de-assembling again lol... I'd prefer it operated automatically as designed though. I don't think there is a way but I learn something new everyday.

Thanks
-Brian
bpw is offline  
Sponsored Links
Advertisement
 
post #2 of 4 (permalink) Old 09-02-2016, 08:21 PM
Senior Member
 
jondog9's Avatar
 
Join Date: Aug 2010
Location: Northern CA
Posts: 8,653
Mentioned: 15 Post(s)
Quoted: 317 Post(s)
How far apart? I believe the SP2's use a thermosensor, not a switch. That sensor will give the ECU the signal it need to operate the fans. They should kick on at 219F and off at 209F, or close to that.
Number 13.

That said, I wouldn't just go buy one with out eliminating the other possible problems. Consult your svc manual.

Good luck, must be a pain having to constantly monitor engine temp.
Attached Thumbnails
Click image for larger version

Name:	Sp2 Thermosensor.jpg
Views:	51
Size:	97.7 KB
ID:	110457  

John, 2000 RC51 #000100


Last edited by jondog9; 09-02-2016 at 08:24 PM.
jondog9 is offline  
post #3 of 4 (permalink) Old 09-02-2016, 08:51 PM
Member
 
Join Date: Sep 2014
Location: Chicago
Posts: 90
Mentioned: 0 Post(s)
Quoted: 9 Post(s)
I am after all just a knuckle dragger but couldn't you just remove the temperature bulb/sensor from the radiator (I'm assuming there is only one) and with it still connected to the wiring harness place it boiling water somehow. If you were to just check for resistance changes at the temp bulb terminals that would only validate the bulb not the entire system.
02RC is offline  
 
post #4 of 4 (permalink) Old 09-02-2016, 09:01 PM
Premium Member
 
PlymptonRC51's Avatar
 
Join Date: Oct 2014
Location: Plympton, Ma
Posts: 178
Mentioned: 0 Post(s)
Quoted: 32 Post(s)
Garage
I don't know of a way to get it working without getting it up to temp. Could use a multi meter to check the circuit. As long as no shorts in system, and ect is sending right temp signal to ecu, then if should work. I would start by running am ohm resistance check on circuit. Set your multimeter to ohm and the 200 setting. Then touch one lead to the black wire on fan relay, and other lead to the right fan switch connector and see if have a low resistance reading, should be around .8 that will show if you have a good circuit. If don't you will have to start working your way backwards testing the circuit. Right fan switch to left fan switch, if that's good, then left fan switch to blue connector where front and rear harness plugs in. If have good circuit from left fan switch to front part of blue connector, then go from back half of blue connector (which is rear harness) to fan relay in tail. If don't have any shorts or breaks in any wires, then can remove ect and test it according to manual. That's what I had to do, ended up having a bunch of broken wires in rear harness.
PlymptonRC51 is online now  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Honda RC51 Forum : RC51 Motorcycle Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome