7.3 coolant temp sensor - Ford Powerstroke Diesel Forum
Powerstroke.org is the premier Diesel Truck Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 11-27-2013, 10:35 AM
If it aint a CAT itsa DOG

 

Join Date: Apr 2007
Location: North Branch, MN
Posts: 4,553
Thanks: 0
Thanked 2 Times in 2 Posts
Feedback Score: 0 reviews
7.3 coolant temp sensor

I have another question for you guys on my new to me 2000 7.3 When i hooked up my AE to it, the coolant temp will just keep climbing on the computer up to 300 some degrees. This happens even when the engine is just started. The EOT seems normal. I was checking these because my cooling fan loves to keep cycling on and off, more staying on. Again right from a cold startup. This is with all the HVAC controls off, so defrost wouldn't be calling for ac. Does it sound like i have a bad coolant temp sensor or EOT sensor? The 2 problems have to be related some how.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 11-27-2013, 10:56 AM
Chapter Director

 

Join Date: Aug 2012
Location: Davenport, IA
Posts: 2,794
Thanks: 3
Thanked 31 Times in 26 Posts
Feedback Score: 5 reviews
Quote:
Originally Posted by dieseldan2005 View Post
I have another question for you guys on my new to me 2000 7.3 When i hooked up my AE to it, the coolant temp will just keep climbing on the computer up to 300 some degrees. This happens even when the engine is just started. The EOT seems normal. I was checking these because my cooling fan loves to keep cycling on and off, more staying on. Again right from a cold startup. This is with all the HVAC controls off, so defrost wouldn't be calling for ac. Does it sound like i have a bad coolant temp sensor or EOT sensor? The 2 problems have to be related some how.
7.3 doesn't have a coolant temp sensor that the PCM can see. The sensor just is hard wired to the gauge in the dash. I'm pretty sure the PCM uses a mix of the intake temp sensor and the EOT sensor. Some one can correct me on that though. What do those sensors say when you hook it up?
Reply With Quote Quick reply to this message
  #3  
Old 11-27-2013, 11:07 AM
If it aint a CAT itsa DOG

 

Join Date: Apr 2007
Location: North Branch, MN
Posts: 4,553
Thanks: 0
Thanked 2 Times in 2 Posts
Feedback Score: 0 reviews
I didn;t check the intake temp, but the oil temp was reading correctly, starting out low and slowly climbing when the engine is cold. When i tried it with the engine warm it was reading normal oil temps, but the coolant was in the 300's which is obviously way off.
Reply With Quote Quick reply to this message
  #4  
Old 11-27-2013, 11:18 AM
Chapter Director

 

Join Date: Aug 2012
Location: Davenport, IA
Posts: 2,794
Thanks: 3
Thanked 31 Times in 26 Posts
Feedback Score: 5 reviews
Quote:
Originally Posted by dieseldan2005 View Post
I didn;t check the intake temp, but the oil temp was reading correctly, starting out low and slowly climbing when the engine is cold. When i tried it with the engine warm it was reading normal oil temps, but the coolant was in the 300's which is obviously way off.
Maybe see what that says those are the only 2 things that I believe could influence the fan
Reply With Quote Quick reply to this message
  #5  
Old 11-27-2013, 12:10 PM
Compression Ignition Addict
 

Join Date: Dec 2007
Posts: 4,840
Thanks: 1
Thanked 80 Times in 75 Posts
Feedback Score: 3 reviews
From the, now defunct, AE Forums;

"I wrote to AE support about this issue. They confirmed that the pinout is there and AE sees it but the 7.3 application does not use this pinout so it floats - the result is that we see bogus information. Just ignore it, it's a result of Ford using the same hardware for multiple applications.

So now we have our answer - just ignore this information. Wish I had known this before - I momentarily panicked when I saw my coolant temp at 280F"
Reply With Quote Quick reply to this message
  #6  
Old 11-27-2013, 12:28 PM
Chapter Director

 

Join Date: Aug 2012
Location: Davenport, IA
Posts: 2,794
Thanks: 3
Thanked 31 Times in 26 Posts
Feedback Score: 5 reviews
Quote:
Originally Posted by NoRalPh View Post
From the, now defunct, AE Forums;

"I wrote to AE support about this issue. They confirmed that the pinout is there and AE sees it but the 7.3 application does not use this pinout so it floats - the result is that we see bogus information. Just ignore it, it's a result of Ford using the same hardware for multiple applications.

So now we have our answer - just ignore this information. Wish I had known this before - I momentarily panicked when I saw my coolant temp at 280F"
So is that saying the 7.3 can see coolant temp or is just the pin out there but not being used? I have always thought the PCM couldn't see ECT until late 01 when they did the big electric switch over
Reply With Quote Quick reply to this message
  #7  
Old 11-27-2013, 01:30 PM
If it aint a CAT itsa DOG

 

Join Date: Apr 2007
Location: North Branch, MN
Posts: 4,553
Thanks: 0
Thanked 2 Times in 2 Posts
Feedback Score: 0 reviews
That is interesting stuff. So back to my other problem, what else would cause my fan clutch to keep kicking on when there is no demand for it?
Reply With Quote Quick reply to this message
  #8  
Old 11-28-2013, 06:22 AM
Compression Ignition Addict
 

Join Date: Dec 2007
Posts: 4,840
Thanks: 1
Thanked 80 Times in 75 Posts
Feedback Score: 3 reviews
Quote:
Originally Posted by Rammstein1224 View Post
So is that saying the 7.3 can see coolant temp or is just the pin out there but not being used? I have always thought the PCM couldn't see ECT until late 01 when they did the big electric switch over

I've never been sure...

There's talk of transmissions effecting the system monitoring the ECT (manuals -vs-auto), the cluster is the only thing connected to it, and what I took from the AE Forum above. I wasn't a participant, just wondered why I saw coolant temps I couldn't account for and looked it up there.

They, and here I'm not sure who "they" were, came back with the whole "pin-out" answer but, again, I've never really understood it either

To the OP, the fan clutch has no idea of what any sensors are seeing. It's self activated...
Reply With Quote Quick reply to this message
  #9  
Old 11-28-2013, 08:34 AM
Chapter Director

 

Join Date: Aug 2012
Location: Davenport, IA
Posts: 2,794
Thanks: 3
Thanked 31 Times in 26 Posts
Feedback Score: 5 reviews
Quote:
Originally Posted by NoRalPh View Post
I've never been sure...

There's talk of transmissions effecting the system monitoring the ECT (manuals -vs-auto), the cluster is the only thing connected to it, and what I took from the AE Forum above. I wasn't a participant, just wondered why I saw coolant temps I couldn't account for and looked it up there.

They, and here I'm not sure who "they" were, came back with the whole "pin-out" answer but, again, I've never really understood it either

To the OP, the fan clutch has no idea of what any sensors are seeing. It's self activated...
Well ill tell you when i monitor with my torque app my coolant shows as -30 degrees so im sure its the same sort of deal as AE. The way i interpret the pin out being on the PCM is just like how when you plug a L99+ pcm into a E99 truck all of a sudden they get a cruise control light that they didnt have before.

I feel its something they always wanted to incorporate but never actually got it to work until L01. An interesting test would be putting a pre-L01 PCM into a L01+ truck and see if you can get some readings for coolant
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Ford Powerstroke Diesel 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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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:

Log-in

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
Display Modes

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



All times are GMT -8. The time now is 01:32 PM.


Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.1
Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.

vB.Sponsors