Depending on the year of your rig, I would assume, our 91 is just behind the emergency brake.

We have checked our wiring, and all the switches, we need a TECA, it seems this might be the Achilles’ heel of our trucks, if it goes out, the truck is done. Hopefully someone on this list has knows a source for a rebuilder !!!

 

Try RockAuto.com
Look up Automatic Transmission Control Unit...

 

Excellent, I'll call them, the part number they list doesn't match mine, but it's the best choice so far. Thanks, John

 

any tcm transmission control module that has a basic part number of 12b565 from 89-94 will work , but if the basic part number is 12a650 that is for gasoline unit and will not work with a diesel
since ford had electronic fuel injection before there were diesels the relay has always been called the EEC. power relay
stands for electronic engine control.
this relay normally supplies power to the processor but also to the transmission
so when it is off there is no electrical power to either unit
it has a hot wire (power at all times) from battery
it has a red feed wire going to the componets which is power out from relay
there is a trigger wire from the ignition switch (power with key in on position)
and the forth wire is ground for the relay
the relay is located on the left fender apron
if it is a dually there is a second relay for the rear fender marker lights
the tcm is located in the left firewall directly behind the inner fender
it has a 60pin connector with a 10mm head bolt securing the connector into the tcm

 

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any tcm transmission control module that has a basic part number of 12b565 from 89-94 will work

We have been told by Ford 1991 is a stand alone year, do you know if this is correct?

Thanks for the help !

 

I just looked up my 93 and rock auto has one for $137 but would rebuild mine for $225? Not sure what the difference is.

A-1 CARDONE Part # 736100 {#F4TF12B565A} Reman.
Trans. code E4OD; without High Altitude Emissions; Vehicle specific Flash programming req'd ON or OFF the vehicle.Accurate VIN and mileage are req'd.Additional on-car programming must be performed AFTER install to prevent drivability issues for $137

A-1 CARDONE Part # 997382 Reman. - Return and Rebuild Service Only - By ordering this service you are agreeing to send your original part to the manufacturer to be rebuilt. Rebuild time is approximately 3-5 business days. You will be contacted with directions once the order is placed. For more information please contact Customer Service.
Trans. code E4OD; High Altitude Emissions for $225

You can also Get a Banks Transcommand for a little over 200. I also beleave ats sells one but its a lot more expensive.

 

ford has part numbers that vary by year due to epa certification
89-91 did not have a flashing overdrive cancel light to inform driver that there was a malfunction and code set
vehicle would only enter failure mode with harsh shifts
92 introduced the flashing tcil capability and used it through 94

 

why do you need another tcm , the reason why they say it needs replacing

 

Thanks guy's for the help and concern, we have checked all the wiring, grounds, and pickup sensors, all good. All indications are we need to replace the teca, I just hope we get the right one because once it's plug in I own it. .

 

if you list the issue you are having i can tell if you need a tcm or not

 

The tach doesn't work, the transmission only has 2nd, and third, no overdrive.

 

ok . the e4od when electrically dead will start off in 4th gear when the shifter is in the o/d position and will shift to 2nd in 2 and manual low.
recheck a couple of items before buying a tcm.
first there are three terminals on the tcm that require 12 volts
pin 1 should have power at all times key off and key on
pin 37 and 57 shoudl have power with key on
all three must have power with key on
with the key on check the red wire at the transmission bulkhead connector and it should have 12 volts with the key on
if any of these arenot powered the tcm and trans will not work
also pins 20 40 and 60 must be grounded
i have seen tcm,s condemned because there is power at pin 1 but pins 37 and 57 are not powered they recieve their power from the eec. power relay just as the trans does