Engine coolant temp gauge not working correctly. - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
LinkBack Thread Tools Display Modes
post #1 of 5 (permalink) Old 07-17-2019, 02:48 PM Thread Starter
PSN Newb
 
Join Date: Jul 2019
Posts: 3
Engine coolant temp gauge not working correctly.

2002 F250 4X4 Automatic Transmission. A friend of mine brought me her truck said the engine coolant temp gauge was not working. She said her son had changed the sensor and still nothing so they thought it might be the gauge it's self. they pulled the cluster and sent it out to have checked. Came back good gauge works. This is when she called me. I have 5 volts at plug and good ground from alternator case to plug is .03v. Called ford got the right sender for the gauge part number 3F1Z-12A648-A. Installed it now the check gauge light comes on and after about a minute of the truck running the gauge pegs out a hot. I also unpluged the cluster and I lose the 5v at the plug.

I have read that the coolant temp sensor does not go through the PCM witch I see no coolant temp wile plugged into the OBD port with my snap-on prolink. Also tha that the PCM uses oil temp for fuel management witch I can see with the scan tool plugged in. Any advise would be helpful.
cs84toyota is offline  
Sponsored Links
Advertisement
 
post #2 of 5 (permalink) Old 07-17-2019, 04:31 PM
Project Shamu
 
Lt.Dan's Avatar
 
Join Date: Mar 2015
Location: Visalia, Ca
Posts: 1,999
Re: Engine coolant temp gauge not working correctly.

I had the same problem with my 02', I cant remember exactly, but something along the lines of in late 01 or 02', they switched the coolant temp sensor to an actual oil temp sensor, so the voltage reading is different from what it used to be. Call up Clay at RiffRaff and he'll get you straightened out, he did it for me as well.

I'll see if I can find that info again...


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
1996 Cali F350 CCFB, 7.3 PSD, 2wd SAS, w/ 378,000 miles.
New Motor at 352,000, DieselSite Legendary Trans at 356,000 and many more
Lt.Dan is offline  
post #3 of 5 (permalink) Old 07-17-2019, 04:35 PM
Project Shamu
 
Lt.Dan's Avatar
 
Join Date: Mar 2015
Location: Visalia, Ca
Posts: 1,999
Re: Engine coolant temp gauge not working correctly.

Found it, I guess it was just a rare thing

https://www.powerstrokenation.com/fo...ml#post6132913


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
1996 Cali F350 CCFB, 7.3 PSD, 2wd SAS, w/ 378,000 miles.
New Motor at 352,000, DieselSite Legendary Trans at 356,000 and many more
Lt.Dan is offline  
 
post #4 of 5 (permalink) Old 07-18-2019, 12:33 PM Thread Starter
PSN Newb
 
Join Date: Jul 2019
Posts: 3
Re: Engine coolant temp gauge not working correctly.

Thanks for the info. I have one of those EOT sensor in stock at our shop I will try it today see what happens.
cs84toyota is offline  
post #5 of 5 (permalink) Old 07-19-2019, 09:48 PM Thread Starter
PSN Newb
 
Join Date: Jul 2019
Posts: 3
Re: Engine coolant temp gauge not working correctly.

Emailed Clay at riffraff gave him the VIN of the truck he said it takes the EOT sensor. Installed one from Ford. Still doesn’t work. I almost think the problem might be in the PCM. All the wire diagrams show it going to the PCM but can not see it on live data when plugged in to scan tool
cs84toyota is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the PowerStrokeNation : 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:
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