RPM not working - Wrist Twisters
 
Thread Tools Display Modes
post #1 of 8 Old 12-09-2012, 05:14 PM Thread Starter
Milites Gregarius
 
Join Date: Sep 2012
Location: Houston
Posts: 174
Rep Power: 1
 
RPM not working

Anyone know what I should check for if my RPM is not working?

Thanks

ASIANREDNECK is offline  
Sponsored Links
Advertisement
 
post #2 of 8 Old 12-09-2012, 05:23 PM
Tirone Choolaces
 
marylandmike's Avatar
 
Join Date: Aug 2007
Location: USA
Posts: 11,126
Rep Power: 1
 
Garage

Awards Showcase
Wrist Twisters Event Attendance Donation Donation 
Total Awards: 3

Page 19-11 of the service manual has a troubleshooting procedure.

marylandmike is offline  
post #3 of 8 Old 12-10-2012, 10:28 AM
John
 
Join Date: Jun 2012
Location: Winchester
Posts: 24
Rep Power: 1
 
We might have the same problem.... Mine stopped working back in June, and the shop said that there was essentially no signal coming out of the ECU. I had a PCIII and ignored good advice to remove it before installing a salvaged ECU. I had a working tach for just a few minutes. THEN I sent the PCIII to Dynojet. It was long-since out of warranty and they checked it out for about $25. They said that it had problems but couldn't have cause my ECU problems...

jbbachky is offline  
 
post #4 of 8 Old 12-10-2012, 07:10 PM Thread Starter
Milites Gregarius
 
Join Date: Sep 2012
Location: Houston
Posts: 174
Rep Power: 1
 


Ok I went out and tried to read it.

I put the Multimeter on DCV 10 and the needle went above the V.MA 10.

I have no clue what I'm reading. The Manual says anything about 10.5 V is good signal from RPM wire. So does that mean the digital gauge is bad?

ASIANREDNECK is offline  
post #5 of 8 Old 04-19-2013, 12:35 PM
lusting over something...
 
james_kraska's Avatar
 
Join Date: Nov 2007
Location: Ottawa
Posts: 585
Rep Power: 1
 
I've had the same problem since the bike was dropped two years ago.

My PCIII is reading TPS and RPM, but once running, the tach will drop to zero. The power is good to the gauges as it will sweep when the ignition is turned on.

Any ideas as to what might be loose or need re-soldering? Everything seems in spec based on the FSM...

james_kraska is offline  
post #6 of 8 Old 04-19-2013, 12:37 PM
The Cripple
 
Pvster's Avatar
 
Join Date: Nov 2009
Location: Phoenix
Posts: 8,768
Rep Power: 1
 
Have you tried disconnecting your PC3 and seeing if the tach works?

Pvster is offline  
post #7 of 8 Old 04-19-2013, 01:21 PM
lusting over something...
 
james_kraska's Avatar
 
Join Date: Nov 2007
Location: Ottawa
Posts: 585
Rep Power: 1
 
Quote:
Originally Posted by Pvster View Post
Have you tried disconnecting your PC3 and seeing if the tach works?
Tried it, same exact symptoms. upside: I got to clean the underside of my rear cowl.

james_kraska is offline  
post #8 of 8 Old 04-20-2013, 09:00 PM
lusting over something...
 
james_kraska's Avatar
 
Join Date: Nov 2007
Location: Ottawa
Posts: 585
Rep Power: 1
 
Today I dove even further into the problem. I removed the gauges completely, separated the housing and removed the PCB. Upon inspection, there was no damage to caps or any burn marks. In case there was some invisible dirt, I used an aerosol electronics cleaner and brush over every circuit, cap, and resistor. Once everything dried, I plugged it all back in and still the same problem.

The dials sweep, everything else works perfectly, but the tach isn't registering any change to RPM. Interestingly, when the gauge is unplugged and you manually move the needle, it drops to zero slowly. When doing the same thing to the needle when the bike is running, it snaps back to zero instantly.

Can anyone with more electronics experience help out here?

james_kraska is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Wrist Twisters 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 Off
Pingbacks are Off
Refbacks are Off

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