Another GPR question-controls - 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 11-10-2011, 02:52 PM
Powerstroke.org Rookie
 

Join Date: Nov 2011
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Another GPR question-controls

Ive done all the testing so far. my gpr has a red 12v control and pink. with the key on the red has 12v and the gpr with only work with the pink grounded and the truck starts fine. Is the pink supposed to be permanently grounded or is it controlled as well. also the red will not shut off when the light shuts off in the truck I assume thats temperature controlled?

Sorry for beating a dead horse ive searched but wasnt able to find the answers.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 11-10-2011, 03:28 PM
Compression Ignition Addict
 

Join Date: Dec 2007
Posts: 4,754
Thanks: 0
Thanked 73 Times in 68 Posts
Feedback Score: 3 reviews
I wish I could help you with the colors,, but basically here's how it works.

You know about the Big terminals I'm sure (1 from the Batt, 1 goes To the GPs) and the two small terminals work like this. 1 has 12v from the Ign source, the other goes to the PCM which provides ground, to complete the circuit, energizing the magnetic coil inside to connect the two Big terminals together.

So, if you ground the side that goes to the PCM the relay throws and you're in business!

Thing is, why doesn't the PCM do it for you like it's supposed to? (and I would verify that it's actually Not). It would be one of two things, that either it's actually trying but there's something wrong with the PCMs circuitry (bad PCM) OR it doesn't "think" you need GPs because the engine is already warmed-up. I believe that decision is made based on the EOT (Engine Oil Temp) sensor located in the HPOP res.

Anyway, that's where I'd start the process of figuring-out what's wrong
Reply With Quote Quick reply to this message
  #3  
Old 11-10-2011, 03:37 PM
Powerstroke.org Rookie
 

Join Date: Nov 2011
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
thats the answer I was looking for! Thanks so much. So Ill replace the sensor to give that a try. Is there a way to test the pcm to see if its an issue? I guess another question is the pcm the main on for the truck or is it something thats separate? i looked at the pcms online and for over $300 I think if its the problem ill just bypass it if I can.
Reply With Quote Quick reply to this message
  #4  
Old 11-10-2011, 03:58 PM
Compression Ignition Addict
 

Join Date: Dec 2007
Posts: 4,754
Thanks: 0
Thanked 73 Times in 68 Posts
Feedback Score: 3 reviews
Gee, don't just "throw parts" at it and hope to get lucky Sometimes it's something stupid you discover while tracking down stuff...

Yes the PCM is the main computer and they Are expensive. You want to make sure you need one before you buy it. Somewhere, in the connector to it, there is a pin that should be supplying ground for between 30sec and 2min (FORGET the WTS light's ON time they're on for longer than that) when it's cold. You could start with a test light at the relay by putting the clip on the (+) side and see if the light comes on. Then trace that back to the computer itself.

I'm afraid I don't know what the EOT sensor parameters are. You need to find out (Google is the key to everything ) and test it to find if That's the problem. Or maybe it's just disconnected!

This is what mechanics get paid the "big bucks" for at the dealership!
Reply With Quote Quick reply to this message
  #5  
Old 11-10-2011, 06:16 PM
Powerstroke.org Rookie
 

Join Date: Nov 2011
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Im not going to buy a pcm just a eot in the morning and pick up a new test light. I saw a write up for a pcm bypass. they used a temp sensor and a few other cheap parts to shut off the relay at a given time I think. I wish I could find it again....other then that ill just buy a relay and toggle and trip the pcm side of the GPR. Is the there a pin out or a color code somewhere that I can easily find the line at the pcm for testing?
Reply With Quote Quick reply to this message
  #6  
Old 11-11-2011, 08:21 AM
Compression Ignition Addict
 

Join Date: Dec 2007
Posts: 4,754
Thanks: 0
Thanked 73 Times in 68 Posts
Feedback Score: 3 reviews
Before anyone can help you with that you need to post the yr/mdl (something you should Always do when asking for help) because they're not all the same.

You can also use Google to find that for yourself
Reply With Quote Quick reply to this message
  #7  
Old 11-11-2011, 08:27 AM
Powerstroke.org Rookie
 

Join Date: Nov 2011
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
its a 99.5 f350 6spd 7.3
Reply With Quote Quick reply to this message
  #8  
Old 11-11-2011, 07:32 PM
Powerstroke.org Fanatic
 

Join Date: Nov 2006
Posts: 116
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
A guy on ebay has the glow plug relay manual control kits if you want to go that way.
Reply With Quote Quick reply to this message
  #9  
Old 11-12-2011, 05:48 AM
Compression Ignition Addict
 

Join Date: Dec 2007
Posts: 4,754
Thanks: 0
Thanked 73 Times in 68 Posts
Feedback Score: 3 reviews
I have this, looks like it's marked GPC (GlowPlugControl?), #13 on the big 42pin connector and #101 to the PCM... maybe? check that though
Attached Thumbnails
Another GPR question-controls-2000_7_3l_wiring_diagram.jpg  
Reply With Quote Quick reply to this message
  #10  
Old 11-12-2011, 02:55 PM
Powerstroke.org Rookie
 

Join Date: Nov 2011
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
I had a new gpr and a plugs from accurate diesel i hadnt used yet. so i installed them today. never did glow plugs before, isnt as bad as i expected only took 4 hours. i had done the 50 cent fix on the wire harness once before so i knew what needed to be done to get into the VC. when i started to remove the connections from the gpr it completely fell apart!!! it just split in half and and then into pieces! it was a replacement from napa...pos... ill see how the one from accurate works. the plugs were burnt but i havent checked resistance on them yet. what should they each read if they are good? Im going to test everything in the am. the truck started right away after i was all done but i had driven it to pick up anti seize before i got started. its supposed to be in the low 40s tonight so in the am ill give her a crank and troubleshoot if need. then i gotta figure out my high idle issue.. ill more then liely do the manual gpr setup if my pcm is acting up. havent bought an eot sensor yet turns out is the same as the coolant temp sensor.
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 10:33 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