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Discussion Starter #1 (Edited)
Searching for speedometer recalibration fixes I came across Forscan software which enable editing BCM as built data. If you search for Forscan guides on google, you will find other Ford models are successfully being recalibrated for larger tires/ gear ratios (the lists go on) using Forscan.
I have only come across one other post on the transit forum where someone used Forscan to enable the trailer tow module in the BCM seen here:

http://www.fordtransitusaforum.com/towing/10274-installing-tow-trailer-hitch-wiring-harness-23.html

This is all foreign to me, but I like tinker.. I downloaded Forscan and bought the adapter off Amazon.. cost $30. It would be nice to have a dedicated thread to start comparing Transit as built data.

Getting back to tires.. larger tires.. I have read several posts over time that mention swapping gears or if already have 3.73 changing the gear ratio in the BCM to recalibrate the speedo.

I believe I found the gear ratio address.. mine is listed as:
726-02-01 0175 A6

Where X175 is your listed axle ratio... which in my case is 3.73.. (the last 2 digits A6 are a checksum?)

14B = 3.31
175 = 3.73
19A = 4.10

Using Forscan I have changed my ratio to 3.31 in the BCM, but it does not effect the speedo... which calculates speed of wheel sensors? Anyway I wanted to start a thread to discuss as built data mods for the Transit.. specifically dealing with tire swapping and speedo calibration

A good tutorial:
https://docs.google.com/document/d/1-8dKaS_Spu4Zw4hV_CrKC4tLoP9G8yejqegF1wxIqxY/edit
 

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You're right about the gear ratio stuff. (*side note...have you use the monitors in Forscan yet? I was monitoring one of the gear ratio identifiers, can't remember the exact one, and when you are actually driving, my original 3.31 ratio showed as 3.73 in real time and when I changed to 3.73 axle and updated BCM, Forscan showed 4.10 in real time... interesting).

You can also set your TPMS sensors down to as low as 30 psi if you know that line in the BCM too. It's possible on other rigs to turn TPMS off with a simple flip of a bit but I haven't found it yet for the Transit. Forscan cannot, at least at this current software release, do anything to calibrate the speedo. Lots of folks trying but lots of folks looking in the wrong place. BCM doesn't handle the speed data processing for the Instrument cluster. :)
 

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Take it with a gran of salt ...

My cheat sheet from dredging the F150 forum had something about the ABS system and getting the PCM to "relearn"?

"PCM module initialization procedure to relearn vehicle data, reads the BCM data for tire size into the PCM
change their tire size in BCM and then force PCM to relearn this new size so that no PCM DTC will be present
It's not a code that turns on the CEL/MIL/SES or whatever light.
new tire size BCM is reporting doesn't match the old size in PCM and throws the DTC"
 

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Anymore progress on this? I had 3.73 gears with stock tires, but am currently running 245/75's with 4.10 gears and am desperately looking for a fix. With my speedometer being off, I actually have about 1000 more miles than my odometer shows at this point and would love to make it accurate again!
 

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On my '15 T250 van, I didn't see anything in the BdyCM Module AS BUILT using FORScan that seems to be in the right HEX range for the calculation mentioned below.


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http://forscan.org/forum/viewtopic.php?f=13&t=2650
"If you convert the hex to decimal, what you get is the circumference of the rear tire in millimeters - but with some sort of revs/mile conversion factor (0.967000) applied."

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https://tiresize.com/calculator/
https://www.binaryhexconverter.com/hex-to-decimal-converter

"tire sizecom" Circum. in mm * 0.967000 convert to hex (stock => 2235mm * 0.967000) = 2161 =hex=> 871

That conversion does come out to the right range for what is posted in the spreadsheets for other tires sizes for the F150 and for F150 it's in the same block as axle ratio.

F150 tires converted ...
https://docs.google.com/spreadsheets/d/1uDSQ1Z5a2Wt8-kjrSiVSlDFGFHnfeuhb3RTMVz95730/edit#gid=110328400

.

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I was using FORScan version 2.3.15 beta for Windows and the ELMconfig USB ELM327 with MS-CAN switch see ...
http://www.fordtransitusaforum.com/engine-technical-discussion/67562-downshift-clunk.html#post933562

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Followup, if found, would be the "PCM module initialization/relearn vehicle data" and checking the TIRESIZE PIDs ...
http://forscan.org/forum/viewtopic.php?f=16&t=6222

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I went through the whole list of PIDs for all modules looking for the TIRESIZE PIDs and struck out.

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"The last 2 characters in each line are the checksum (automatically calculated by FORScan)"
http://www.expeditionforum.com/threads/forscan-tweaks-2015.32082/page-53#post-293324

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Something from across the pond ...
http://www.therollinghome.co.uk/2018/02/22/fault-reading-for-beginners-elm327-forscan/

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See also "any useful FORScan info on the Transit" ...
http://www.fordtransitusaforum.com/engine-technical-discussion/69250-auto-stop-start.html#post922450


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Screen prints
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2015 VIN BCM ...





2018 VIN BCM additional blocks ...



2015 VIN modules ...



2015 VIN service procedures ...



stock tiresize.com ...



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Retrieve Ford AsBuilt by VIN ...
https://www.motorcraftservice.com/AsBuilt/



⍨ Some brave soul still under warranty might to volunteer to change the axle ratio and "reset" the "right" module(s) and use a "Lite" version of FORScan to monitor changes via PIDs? ⍨

 

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As most of us know the Transit is lacking MANY things available on the hugely more popular F150.
Therefore if we don't have it we can't use any scan tool to change it or even read it.
Had a quick look at your link- much of that stuff isn't possible by anyone on any Transit- we don't have it- so?
That certainly is no fault of ForScan- maybe blame Ford.

I think anything that CAN be changed on the Transit CAN be changed by ForScan- just nobody has tried or if they did they kept it quiet.
example- ForScan forum- I asked about clearing the Transit Transmission Adaptive Tables. Asked here too.
Crickets.
I tried it and posted about it when it worked- AFAIK no one else has done it or if they did they kept quiet about it.

I searched for weeks to find a scan tool to do things that can be done on the Transit and short of the Ford tool itself, which is thousands to buy and thousands a year to use- I couldn't find any tool that even came close to ForScan- at ANY price.
 

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As most of us know the Transit is lacking MANY things available on the hugely more popular F150.
Therefore if we don't have it we can't use any scan tool to change it or even read it.
Had a quick look at your link- much of that stuff isn't possible by anyone on any Transit- we don't have it- so?
That certainly is no fault of ForScan- maybe blame Ford.

I think anything that CAN be changed on the Transit CAN be changed by ForScan- just nobody has tried or if they did they kept it quiet.
example- ForScan forum- I asked about clearing the Transit Transmission Adaptive Tables. Asked here too.
Crickets.
I tried it and posted about it when it worked- AFAIK no one else has done it or if they did they kept quiet about it.

I searched for weeks to find a scan tool to do things that can be done on the Transit and short of the Ford tool itself, which is thousands to buy and thousands a year to use- I couldn't find any tool that even came close to ForScan- at ANY price.
I am not sure who to blame, I tried a couple of F150 mods, and they did not work. I would be happy if I were able to turn off the panic button on my FOB, that has excellent range and often goes off in my pocket when I am out of ear reach of my Transit.
 

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I would be happy if I were able to turn off the panic button on my FOB, that has excellent range and often goes off in my pocket when I am out of ear reach of my Transit.
Easy. A little epoxy around the edge of the button works. My horn and panic button are both disabled. No more horn honking.
 

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Transit => "I've a feeling we're not in Kansas any more."

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I see the same type of discrepancy between the model years in the BEEM versions as in the As Built block. The later BEEM did mention making changes in the "central car configuration".

Set Central Car Configuration parameter 24 – With Rain sensor to 01: (Without Rain Sensor)
Parameter 88 for Auto Light should be set to 01: (Without Auto Lights)

Central Car Configuration (CCC) programmed to the correct parameters:
CCC Parameter 20 0x01 without trailer tow / 0x08 Trailer Module 7 - Pos Socket

If the battery type on a vehicle is changed to other compatible derivatives (see battery configuration table) it is required to reconfigure the vehicle to the new battery types from the dealer. Central car configuration can be updated at a dealership.
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FORScan ... How to program Central Configuration using FORScan
http://forscan.org/forum/viewtopic.php?f=6&t=1932

Update of 2016-12-28:
Majority of vehicles with central configuration (actually, all except Fiesta family) require secondary boot loader (SBL) to be loaded before accessing the central configuration. These files are not a part of FORScan package and have to be downloaded and installed separately. There are 2 ways to do it:

1. Download necessary file directly from Ford Tech Service site
2. Download this archive that contains most popular SBL files and unzip it to Documents/CalibrationFiles folder.
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I did run into that SBL required by accident. I was in the wrong place at the wrong time - second time hooked up out in the garage. It said something about needing an internet connection to get it. The info in the FORScan page linked above is dated and has no mention of getting it while "hooked up" Looks like that may be the direction to take. Maybe some of the EEs on board can "chip" in on this project. Misery likes company and this isn't using punch cards to load a program like they taught us in the '70's.

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Random notes:

DTCs;
Blam => Way too easy to generate multitudes of them by just chickening out of a process.
FORScan => Common principles of diagnostic with FORScan => http://forscan.org/forum/viewtopic.php?f=6&t=2540

PIDs:
FORScan => Breaks them down by module - merits some thought about the linkages.
Dam => Don't mix ones from the MS-CAN & HS-CAN and try live data streaming them.

Bits and Blocks:
FORScan => "So for example there is 726-01-01 which means BCM, Memory Block 1, Line 1."
BEMM => CCC Parameter 20 0x01 without trailer tow / 0x08 Trailer Module 7 - Pos Socket
Blam Potential => Important notes about As Built configuration and programming => http://forscan.org/forum/viewtopic.php?f=16&t=4563

Central Configuration:
FORScan => Terminology: CC; SBL; CCT; parameters; Calibration Files
BEMM => Terminology: CCC; Parameter

Addenda:
The FORScan configuration txt file lists: "Part number: CK4T-14B476-CL (latest known: JK4T-14B476-DB); Strategy: BK2T-14C184-AS and Calibration: BK2T-14C185-AS" in the Body Control Module for my vehicle. This is the same "nomenclature" for the "SBL files" (aka: Calibration Files; fordtechservice\PCMReprogram\IDS Calibration Files) => IE: BK2T-14C184-AS.vbf).

5Star Tuning requires the Transit ECU Strategy/PCM code for a custom tune. (2015-2016 Transit 3.5L EB/3.7L SCT X4 = $449.95 / 2015-2016 Transit 3.5L EB/3.7L SCT = LiveWire TS $649.95)

FORScan states to revert back to stock before making any changes if you have a tune "loaded".


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