How To Control TCC Lock Up
Fleet Owner
Joined: Aug 2005
Posts: 23,667
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From: Easton,Ks
Originally Posted by Skandocious
I was working with the harness that you posted a diagram for, the EEC harness, right under and to the side of the master brake cylinder.
Do not recall telling anybody to do any thing to the EEC harness at the Computer.
Postmaster
Joined: Oct 2006
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From: Davis & Newcastle, CA
Originally Posted by subford
Here is a link to a diagram:
http://i54.-----------.com/albums/g91/subford/Electrical/EEC%20PCM/19935.gif
But you should be able to find it up on the fender in plug C103.
C103, 5.8L LH side of engine compartment, top of wheel well Terminals:04 Color: BK.
Here is a link to a diagram of C103.
http://i54.-----------.com/albums/g91/subford/Transmission/1993C103.gif
http://i54.-----------.com/albums/g91/subford/Electrical/EEC%20PCM/19935.gif
But you should be able to find it up on the fender in plug C103.
C103, 5.8L LH side of engine compartment, top of wheel well Terminals:04 Color: BK.
Here is a link to a diagram of C103.
http://i54.-----------.com/albums/g91/subford/Transmission/1993C103.gif
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
Originally Posted by Skandocious
I didn't know which was the C103 plug so I just assumed since you posted that first diagram that it could be tapped there...
The Computer plug diagram was to show him that the wire was there that he could not find.
The reason he could not find it was he was looking for the wrong wire color.
I miss called the wire (P/Y) Pink/Yellow and the wire color was Purple/Yellow. Pink/Yellow would have been (PK/Y).
Postmaster
Joined: Aug 2004
Posts: 2,908
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From: West Mansfield, Ohio
Heyyyyyyyyyy everyone wait a few here. I did this with my truck a while back. Let me explain a few things....
First off... yes its possible. I did this to mine. I've got a 3 position rocker. Up position is locked up, middle is normal computer control, and the bottom is unlocked completely.
But there's a problem with doing this. If your computer tells the torque converter to lockup at a certain speed.... and doesn't notice an RPM drop in about 3 cycles... it will throw the transmission into "limp mode" and cause hard shifts. It will go away after about 50 or 60 miles, as long as it doesn't notice any more errors. Just be cautious when doing this. I've heard from a few people that allowing the torque converter to slip for longer than normal will cause the fluid to heat up and eventually burn up the converter, but I question that rumor because of the simple fact that any Dodge or Chevy tranny, or even newer 4R70W equipped Fords, don't have the TC lockup until after it is in Overdrive. So you're on your own here!
First off... yes its possible. I did this to mine. I've got a 3 position rocker. Up position is locked up, middle is normal computer control, and the bottom is unlocked completely.
But there's a problem with doing this. If your computer tells the torque converter to lockup at a certain speed.... and doesn't notice an RPM drop in about 3 cycles... it will throw the transmission into "limp mode" and cause hard shifts. It will go away after about 50 or 60 miles, as long as it doesn't notice any more errors. Just be cautious when doing this. I've heard from a few people that allowing the torque converter to slip for longer than normal will cause the fluid to heat up and eventually burn up the converter, but I question that rumor because of the simple fact that any Dodge or Chevy tranny, or even newer 4R70W equipped Fords, don't have the TC lockup until after it is in Overdrive. So you're on your own here!
Postmaster
Joined: Aug 2004
Posts: 2,908
Likes: 2
From: West Mansfield, Ohio
Whenever the original transmission in my truck went bad, it was doing some extremely wierd shift combinations. For instance, it would make it halfway through first, lockup the converter, and then slam into second. In the meantime, I was working on my Ranger, and my F-1 had to last me about another week. So I installed that to make things a little easier and less annoying on me!
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Senior User
Joined: Nov 2002
Posts: 294
Likes: 2
From: Central Coast, California
Thought I would update on the Torque converter clutch solenoid switch I installed back in june.
I really like fact that when cruising around town that I do not get the annoying 2nd to 3 shift with TCC lockup because 2 to 3 fells like 2 to 4 when running with the factory program.
Now all I need to do is install a updated valve Body but college students tend not to have a lot of spending money.
I really like fact that when cruising around town that I do not get the annoying 2nd to 3 shift with TCC lockup because 2 to 3 fells like 2 to 4 when running with the factory program.
Now all I need to do is install a updated valve Body but college students tend not to have a lot of spending money.
Senior User
Joined: Oct 2002
Posts: 272
Likes: 1
From: Grande Prairie, AB
Now when the computer allows ground to the TQ Converter, does it monitor engine RPM to signal it has been done, and if the preset parameters arent matching does it send a fault code, indicating a bad torque converter clutch, or malfuntioning TQ Converter?
Senior User
Joined: Oct 2002
Posts: 272
Likes: 1
From: Grande Prairie, AB
Thats what I thought, and I dont think that type of switch inside the cab is a good selling point cause 2/3 of people dont even know or can imagine what is going on and think the vehicle has been modified beyond the scope of their knowledge. Not only that a Check Engine light on all the time that needs to be reset at resale time doesnt make sense. I doubt it will make anything but worse MPG and we all know its time for a change.
Junior User
Joined: Jul 2007
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