TC Lock Tech Question - 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 03-30-2008, 07:54 PM
PMR = JUNK

 

Join Date: Nov 2007
Location: NW, Ohio
Posts: 11,187
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 2 reviews
Send a message via AIM to Jake Send a message via Yahoo to Jake
TC Lock Tech Question

I don't expect many people to know this one, hopefully though someone on here has a bit of experience and knowledge about the electrical system on these trucks.

Its my understanding that when you do the manual TC lockup mod, in order to make the OD light not flash, you have to fool the PCM into thinking it still has control of the TC. You do that by feeding it a resisted 12v signal.

Now my question. Since that works for tricking the PCM when manually locking it, does the same thing apply for a manual unlock? If i wire it so it sends the same resisted 12v when manually unlocked as when it is manually locked, will it keep the OD light from flashing? Or will I fry my PCM? Or will it just do nothing and flash anyway?

Can anybody help me on this one?
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 03-30-2008, 08:20 PM
Compression Ignition Addict
 

Join Date: Aug 2007
Posts: 360
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Good question, I don't have an answer. But I am curious on why you would want to manually unlock the TC?
Reply With Quote Quick reply to this message
  #3  
Old 03-30-2008, 08:23 PM
PMR = JUNK

 

Join Date: Nov 2007
Location: NW, Ohio
Posts: 11,187
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 2 reviews
Send a message via AIM to Jake Send a message via Yahoo to Jake
For sled pulling. I've heard that you can do better if you keep the TC from locking. I think it was CSIPSD that told me that he has his set up so he can manually lock or unlock the TC. He said his OD light flashes though, im trying to figure out how to make it not flash.
Reply With Quote Quick reply to this message
  #4  
Old 03-30-2008, 08:25 PM
PMR = JUNK

 

Join Date: Nov 2007
Location: NW, Ohio
Posts: 11,187
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 2 reviews
Send a message via AIM to Jake Send a message via Yahoo to Jake
nope, it was strokin_early_99 that told me about it.
Reply With Quote Quick reply to this message
  #5  
Old 03-30-2008, 08:52 PM
PMR = JUNK

 

Join Date: Nov 2007
Location: NW, Ohio
Posts: 11,187
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 2 reviews
Send a message via AIM to Jake Send a message via Yahoo to Jake
Common, someone's gotta know.
Reply With Quote Quick reply to this message
  #6  
Old 03-30-2008, 08:57 PM
Electrical Ogre
 

Join Date: Aug 2007
Location: Calgary, Alberta
Posts: 11,586
Thanks: 29
Thanked 49 Times in 46 Posts
Feedback Score: 1 reviews
I think you could add another relay to provide the PCM with a resistive load, and break the connection with the TC. The reason the OD light flashes is the PCM thinks there is a fault in the TC lockup circuit, provide it with the nessesary resistance, and it should be happy.
Reply With Quote Quick reply to this message
  #7  
Old 03-30-2008, 09:00 PM
PMR = JUNK

 

Join Date: Nov 2007
Location: NW, Ohio
Posts: 11,187
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 2 reviews
Send a message via AIM to Jake Send a message via Yahoo to Jake
Quote:
Originally Posted by alberta 7.3 View Post
I think you could add another relay to provide the PCM with a resistive load, and break the connection with the TC. The reason the OD light flashes is the PCM thinks there is a fault in the TC lockup circuit, provide it with the nessesary resistance, and it should be happy.
Thats what i was thinkin about doin. So basically as long as i have the resisted load going to the PCM, i can have it manually locked or unlocked and it wont flash?
Reply With Quote Quick reply to this message
  #8  
Old 03-30-2008, 09:01 PM
John Wood Nut Swinger

 

Join Date: Jan 2007
Location: too far from Texas
Posts: 3,410
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 1 reviews
Yup it was me. I sled pull with the TC manually unlocked plus my DP tuner has the lockup set at 47mph. Like I would ever hit 47mph in 4low on the sled pull track but I like redundant systems...LOL

I have also used it to unlock the TC while towing in the mountains and I got stuck behind another RV. I needed a few more RPM to keep the EGT's in check with my old turbo setup. I just flipped the switch and the RPM increased about 900rpm and the EGT's dropped. FWIW, The trans never got over 185*.

The big thing is to never let the PCM see more then 5Volts. That is the maximum feedback voltage from any of the sensors on the truck. More than 5V and you will fry the PCM.
Reply With Quote Quick reply to this message
  #9  
Old 03-30-2008, 09:05 PM
PMR = JUNK

 

Join Date: Nov 2007
Location: NW, Ohio
Posts: 11,187
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 2 reviews
Send a message via AIM to Jake Send a message via Yahoo to Jake
Quote:
Originally Posted by strokin_early_99 View Post
The big thing is to never let the PCM see more then 5Volts. That is the maximum feedback voltage from any of the sensors on the truck. More than 5V and you will fry the PCM.
So im assuming the 20,000 ohm resistor used in guzzles method takes it down to 5v? Don't they have diodes that limit voltage? which would be better?
Reply With Quote Quick reply to this message
  #10  
Old 03-30-2008, 10:20 PM
Compression Ignition Addict
 

Join Date: Jan 2008
Location: Covina CA
Posts: 596
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
wouldnt you still get a trans slip code?
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:
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 06:54 AM.


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