Electrical ;TPS, PCM and OD Trans Control - Dodge Cummins Diesel Forum
89-93 Tech Articles Tech Articles for the 89-93 12V Dodge Cummins Diesel...NO ADVERTISING

 
LinkBack Thread Tools Display Modes
post #1 of 4 (permalink) Old 01-06-2009, 11:04 PM Thread Starter
Newbie
 
Join Date: Dec 2008
Location: stockton ca
Posts: 14
Thanks: 0
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
Electrical ;TPS, PCM and OD Trans Control

So I'm doing a 12v swap into a 77 1/2 ton ford.

I've already found the DIY for TPS delete and using a voltage regulator to control the Alt.

I cant seem to find a wiring diagram for a 92 w250.

By removing the PCM I will have to run the 2 DIY's mentioned above, but i do not know which of the 3 wires on the TPS is 12v, and which wire on the OD is 12v?

trailbound is offline  
Sponsored Links
Advertisement
 
post #2 of 4 (permalink) Old 01-07-2009, 12:15 AM
1ST GEN MODERATOR
 
Philip's Avatar
 
Join Date: Nov 2007
Location: Indiana
Posts: 15,241
Thanks: 72
Thanked 1,756 Times in 1,405 Posts
iTrader Score: 11 reviews
A 518/46RH trans only has a two wire plug for the OD. Power to one wire and ground the other. Its just a controll solenoid. It doesn't care which wire is hot or ground.

If your not using the PCM on your swap the TPS is not needed. That sensor feeds a signal to the PCM. The trans itself has no use for that signal.

To control OD just pickup a Hobbs adjustable pressure switch. Plumb it into the test port for the governer on the trans. Then adjust it to the MPH you want OD to come in at. The down side to this way of hooking it up is it will only go into OD at the set MPH. There will be no part throttle upshift. It will work if the main thing. Any time you would drop below the set point it would down shift to 3rd.

2014/93 W350 DRW, fuel pin turned, 6X.018" injectors, 4" exhaust, 3" air intake horn, Super HX40/16, G56 SBC Con-OFE, 3:07's axles, 2" skyjacker lift, air ride rear suspension,B&W flatbed
Philip is offline  
post #3 of 4 (permalink) Old 01-07-2009, 12:43 PM Thread Starter
Newbie
 
Join Date: Dec 2008
Location: stockton ca
Posts: 14
Thanks: 0
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
ok, so by taking out the PCM, i don't need to do a pot. and i can just take the TPS off. But the TPS has the ability to semi adjust shift points.

How will the trans react without a TPS and without a pot?
trailbound is offline  
post #4 of 4 (permalink) Old 01-07-2009, 01:11 PM
1ST GEN MODERATOR
 
Philip's Avatar
 
Join Date: Nov 2007
Location: Indiana
Posts: 15,241
Thanks: 72
Thanked 1,756 Times in 1,405 Posts
iTrader Score: 11 reviews
Quote:
But the TPS has the ability to semi adjust shift points.
The PCM controls the OD shift. Without a PCM there is no need for the TPS. The solenoid inside the trans is a on/off electric solenoid. The TPS is nothing but a variable voltage signal for the PCM.

All the trans sees from the PCM is one of the wires going to ground to engage the soleniod. The trans has no idea it is controlled by a PCM. All it wants is a ground signal on one wire from the solenoid to engage OD. What controlls the ground doesn't matter. It could be a PCM or a single toggle switch or a Hobb's switch.

2014/93 W350 DRW, fuel pin turned, 6X.018" injectors, 4" exhaust, 3" air intake horn, Super HX40/16, G56 SBC Con-OFE, 3:07's axles, 2" skyjacker lift, air ride rear suspension,B&W flatbed
Philip is offline  
Sponsored Links
Advertisement
 
The Following 8 Users Say Thank You to Philip For This Useful Post:
1st Gen Cummins man (02-18-2010), C3KNIGHT (07-13-2010), finacemech (06-25-2010), fisrtgenlover (01-14-2014), Hemijosh426 (01-25-2010), imfummin69 (04-05-2013), kenmartin (09-18-2011), mrmoparwl (09-22-2009)
Closed Thread
Gear in this thread - Powered by O'Reilly Auto Parts

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Dodge Cummins 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









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 not 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