FORScan Modifications

[LB'sTremor]

Torrie sent me this. PFCZOG5?

@2021 Ranger did this work or did you have to flash to stock?

LB

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[2021Ranger]

I didn’t try that as it was my tune, but I flashed back to stock, made the changes and flashed the tune back in..
Hope next time if there is one I won’t have to do that..

 

[JediSamReye]

Ok, I thought I ask the room for some help here. The only thing I wasnt able to do with Forscan so far is getting the tire programming set.
I have a LT 285/70R17
From the math with the spreadsheet calculator it should be 2524, and it had originally in it 2356.
I had read that it was normal to get a couple wrench errors after changing the value and rebooting.
I then didnt start the car, I just did ignition (no foot on the brake) and the engine light was there, so I was looking around for the settings it wanted me to reset. I couldnt find a clear thread about what to do next.
So I did what anyone does in a panic, I put it back to 2356 and then wrote it, and then ignition cycled and didnt go back.

I would love to get this running, once I go back in there and do the 2524, what steps after that should be needed?
Thank you everyone!

 

[airline tech]

Ok, I thought I ask the room for some help here. The only thing I wasnt able to do with Forscan so far is getting the tire programming set.
I have a LT 285/70R17
From the math with the spreadsheet calculator it should be 2524, and it had originally in it 2356.
I had read that it was normal to get a couple wrench errors after changing the value and rebooting.
I then didnt start the car, I just did ignition (no foot on the brake) and the engine light was there, so I was looking around for the settings it wanted me to reset. I couldnt find a clear thread about what to do next.
So I did what anyone does in a panic, I put it back to 2356 and then wrote it, and then ignition cycled and didnt go back.

I would love to get this running, once I go back in there and do the 2524, what steps after that should be needed?
Thank you everyone!

What was your original tire size? 17 or 18

 

[JediSamReye]

What was your original tire size? 17 or 18

According to the door sticker front and rear were 265/60r18 110T

 

[dozxab]

Ok, I thought I ask the room for some help here. The only thing I wasnt able to do with Forscan so far is getting the tire programming set.
I have a LT 285/70R17
From the math with the spreadsheet calculator it should be 2524, and it had originally in it 2356.
I had read that it was normal to get a couple wrench errors after changing the value and rebooting.
I then didnt start the car, I just did ignition (no foot on the brake) and the engine light was there, so I was looking around for the settings it wanted me to reset. I couldnt find a clear thread about what to do next.
So I did what anyone does in a panic, I put it back to 2356 and then wrote it, and then ignition cycled and didnt go back.

I would love to get this running, once I go back in there and do the 2524, what steps after that should be needed?
Thank you everyone!

I went to 265/70R17 and changed from 2360 to 2438 with no issues. Try again and do the power cycle as it tells you to (off and then on with no start). Turn it off and start the motor normally. I actually made about 4 changes, followed by a test drive and using 10 miles worth of mile markers and GPS to get it perfect. I can't help myself. Keep in mind, the odometer will be right on and the speedometer will read a little fast, due to a law suit over a speeding ticket a long time ago.

 

[JediSamReye]

I went to 265/70R17 and changed from 2360 to 2438 with no issues. Try again and do the power cycle as it tells you to (off and then on with no start). Turn it off and start the motor normally. I actually made about 4 changes, followed by a test drive and using 10 miles worth of mile markers and GPS to get it perfect. I can't help myself. Keep in mind, the odometer will be right on and the speedometer will read a little fast, due to a law suit over a speeding ticket a long time ago.

Yeah, I will try again today, and see if that is closer then it was. But just to be clear, you just changed the value and did the standard restarts? I shouldnt have to reset or relearn anything? I am willing to do the work, just making sure I understand your reply correctly

 

[dozxab]

Yeah, I will try again today, and see if that is closer then it was. But just to be clear, you just changed the value and did the standard restarts? I shouldnt have to reset or relearn anything? I am willing to do the work, just making sure I understand your reply correctly

Correct. After you do the "Write", I believe it tells you to power off. Do that, then turn the key to "Run" without starting. Then, turn it to off, disconnect the OBDII and start the motor. Everything should appear normal at that point.

 

[airline tech]

Being that I am still stock and have not attempted the Tire Size change, I can only see the varied issues being reported - such as a constant DTC with the light or only a hidden DTC that shows when you scan.

The issue comes from the BCM - Vehicle Configuration Data - this is the only place where the As-Builts can be altered for - Tire Size

However, the Tire Size Data - is sent across the Can Bus (Network) to various other modules and they have learned the OEM data and sometimes they put up a fight in accepting the new data as this is now normal.

The Main Modules are the - ABS - PCM and the IPMA

So, try this first:

Set the New Tire Size
Key (Off)
Open & Close (Drivers Door) & Wait 5-Minutes (Module Sleep)
Then Start the Truck

If you have DTC Codes (Clear Them)

Then take it for a drive

This is where it gets tricky as after the drive and you run another scan you may see one of 2 codes. (I do not remember the exact codes off hand) Thinking U0422 was one of them.

They are being generated due to mismatch of data between the BCM and the other modules, this is what I would like to (find the solution) to rid this mismatch error vs having it as a constant hidden DTC code.

So be it:
KAM Reset - dump the PCM Learned Data (Old) or
Relearn Vehicle Configuration Data
as the possibles to fix the mismatch issue and force the modules to accept the new tire size and adjust the (Wheel Speed - Calibration Factor) to that tire size.

Granted - IDK how many owners - set the tire size and have (Zero Issues or Faults)
Vs (No Issues but have a hidden fault that shows when scanned) and I have not played with this setting to find the (cure all) solution to get to the point (All You Have To Do - IS ???)

 

[PltFX4]

Has has been noted in other threads, the ProCal Ford Performance Tuning Tool has a Tire Size function in it to do what @JediSamReye is trying to do with FORscan... it uses tire rotation per mile as the unit of measure... and gives no codes or errors. There are other scanners that are mostly dedicated to do the same tire size adjustments (for me, twice per year between summer and winter tire sets).

If you are not doing a lot of other mods via FORscan, having a dedicated tool for that one task maybe less hassle that using FORscan. The investment is not that much and with each new set of tires you can adjust as needed very quickly.

Just IMO.

 

[dozxab]

Has has been noted in other threads, the ProCal Ford Performance Tuning Tool has a Tire Size function in it to do what @JediSamReye is trying to do with FORscan... it uses tire rotation per mile as the unit of measure... and gives no codes or errors. There are other scanners that are mostly dedicated to do the same tire size adjustments (for me, twice per year between summer and winter tire sets).

If you are not doing a lot of other mods via FORscan, having a dedicated tool for that one task maybe less hassle that using FORscan. The investment is not that much and with each new set of tires you can adjust as needed very quickly.

Just IMO.

The ProCal has an advertised limit of 265/70R17 making Forscan or similar a necessary tool.

 

[PltFX4]

The ProCal has an advertised limit of 265/70R17 making Forscan or similar a necessary tool.

I have not seen that in my use of it. all you tell it is rev per mile and it updates. Checking the MPH with GPS and mile markers confirmed it adjusts correctly... in my use case anyway.

 

[dozxab]

I have not seen that in my use of it. all you tell it is rev per mile and it updates. Checking the MPH with GPS and mile markers confirmed it adjusts correctly... in my use case anyway.

As stated here. https://performanceparts.ford.com/part/M-9603-REB
I did the ProCal tune on my Ranger and my brother's Bronco but used Forscan to do tire size changes on both of them. I never tried with the ProCal.

 

[JediSamReye]

I went in and did 2524 and wrote it, and drove. Drove about 20-30 minutes an no issues, and the GPS app and the speed signs I passed all seemed to mean I am significantly closer then I was before this. No error messages or lights. But I can keep monitoring.

 

[TJC]

I miss the old days where you simply change the gear at the end of the speedo cable going into the transmission. No DTCs to deal with.

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