Softail Deluxe Temperature sensor? - Harley Davidson Forums: Harley Davidson Motorcycle Forum
LinkBack Thread Tools Display Modes
post #1 of 2 (permalink) Old 11-22-2012, 12:41 AM Thread Starter
Proud South African
Join Date: Jul 2012
Location: Centurion, South Africa
Posts: 52
Softail Deluxe Temperature sensor?

I did an interesting thing to my speedominator... I added a line that reads and decodes the diagnostic data transmitted by the ECU. One of the things I obtained this way was the engine temperature. I compared this temperature to the one I measure from the cylinder head (my sensor is like a washer that sits between the sparkplug and the head).

I notice that the ECU reports the temperature about 18F colder than what my sensor measures. And that is while the engine is still cold. After riding to work my sensor measured 300F while the ECU said 233F.

Now I rather trust the ECU's temperature, but I'm wondering why the big difference. Just to validate the accuracy of my temperature sensor I connected another one, and it read the same. So, I know I am measuring the CHT correctly.

The question now... where does the ECU measure the temperature from? And, does it measure oil temperature? Or Cylinder temperature? It's a 2006 Softail Deluxe.
OomD is offline  
Sponsored Links
post #2 of 2 (permalink) Old 11-22-2012, 06:57 AM
Retired citizen
Join Date: Jun 2009
Location: Pt. Wash.,WI
Posts: 15,151
The oem temp sensor measures the actual front head temp. Remove it for inspection and you'll see. It screws into a dead end hole, it doesn't protrude into the combustion chamber. It's located behind the horn in the front head, pull the rubber boot back, unplug the electrical connector and screw it out. I think the temp sensor is a thermister.

Disclaimer : Don't believe anything I say unless you are absolutely sure that I know what I'm talking about .
SCHMIDTYS is online now  

Quick Reply

Register Now

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

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


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

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

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