I have an issue, where everytime I start the car, I get "Tyre Pressure Sys Malfunction - Service Required" show on the display.

Should probably start by saying it's a 61 plate Mk3 2011 Ford Focus (But Ford website shows it as a 2012)...

Having used ForScan (extended licence), it shows ABS fault U1031:41-2B - Deflation Detection System, General Checksum Failure

I was led to believe that the ABS module most likely had incorrect data, and that I should check the AsBuilt data is correct.

I've looked at the AsBuilt data for the ABS, and it shows:
760-01-01: 0000-0000-0069
760-01-02: 0000-0000-006A
760-01-03: 0000-0000-006B
760-01-04: 0000-006C

Looking on https://www.motorcraftservice.com/AsBuilt and using my VIN number WF0KXXGCBKBU47458, it shows no AsBuilt data for the ABS module

I am assuming that either the ABS data is incorrect, since it has just a bunch of zeros and a checksum, or, it's all zeros because there is no AsBuilt data showing on MotorCraftService.

I used ForScan to disable the DDS in Central Configuration, and the warning (along with the warning light) has gone, but, if the car was originally equipped to use DDS, I would like to keep it if possible.
For what it's worth, I've also checked the Live Data and monitored the Wheel Speed Sensors on ForScan, which appear to be reporting correctly, all 4 wheels.

As a side note, when DDS was enabled, if I go to Driver Assist > Tyre Deflation > and Hold 'OK', the progress bar gets all the way to the end as normal, but always results in "Tyre Pressure not stored".

Is anybody able to shed some light on this issue at all please?

3 hours ago, avisonjohn said:

Should probably start by saying it's a 61 plate Mk3 2011 Ford Focus

Well at least that explains what a Ford model: Avison is 🤣 - Might be an idea to amend your profile.

Have any of the ABS wheel sensors been changed ?

Has the car got the original factory fitted wheels and tyre size fitted ?

Disconnect the car battery negative lead for 20 minutes. Reconnect and wait for 5 minutes before turning on the ignition and trying to reset TPMS.

Doh - Google Auto Fill strikes again - must have put my Surname in the car model and I hadn't noticed 🤣

I only picked up the car (used, obviously) a few days ago, but can see no invoices showing ABS sensors have been changed, and previous owner says they have not changed them at any point in the last few years that they owned the vehicle.

Wheels look standard standard Ford 5 spoke wheels...it's a Titanium if that makes any difference

(Not my photo, but same wheels as these:)
 

 

Tyres are all 235/40/R18, which appears to be standard size, so I assume the ABS should pick up the correct rotational speed from the circumference.
Two Mazzini tyres on the front, two Zeetex tyres on the rear.

 

Edit: By resetting the TPMS, I assume you mean the regular Drive Assist > Tyre Deflation process? Just want to confirm as it's DDS, not TPMS, and just checking you don't mean to find something labelled 'TPMS' in ForScan or something..

3 hours ago, unofix said:

Well at least that explains what a Ford model: Avison is 🤣 - Might be an idea to amend your profile.

Have any of the ABS wheel sensors been changed ?

Has the car got the original factory fitted wheels and tyre size fitted ?

Disconnect the car battery negative lead for 20 minutes. Reconnect and wait for 5 minutes before turning on the ignition and trying to reset TPMS.

Just looking through your message again - I'm assuming with the battery disconnect, I should program DDS back into the car first, and then disconnect the battery, right?

** Duplicate post - internet connection timed out **

5 hours ago, avisonjohn said:

Just looking through your message again - I'm assuming with the battery disconnect, I should program DDS back into the car first, and then disconnect the battery, right?

Sorry, yes I did just mean the DDS reset, just like you would normally do after adjusting the tyre pressures. You will need to have the system turned on/working before doing a reset with the battery.

BEFORE you do any disconnection of the battery, use FORScan and check that the wheel and tyre size is set correctly in the settings. A previous owner may have changed them at some time in the past if they had been using different wheels.

On 2/19/2025 at 11:49 PM, unofix said:

Sorry, yes I did just mean the DDS reset, just like you would normally do after adjusting the tyre pressures. You will need to have the system turned on/working before doing a reset with the battery.

BEFORE you do any disconnection of the battery, use FORScan and check that the wheel and tyre size is set correctly in the settings. A previous owner may have changed them at some time in the past if they had been using different wheels.

Sadly, removing the battery made no difference at all.
I checked the tyre size with ForScan, and it shows the correct tyre size too

Does anybody else have any insight as to why the tyre pressure will not store, or why the error regarding the checksum is showing? 

Does the car have a separate module superficially to this function which may be bad, or, is it all done via the ABS module? 

If ABS Module, where is this located, and would replacing this potentially rectify the issue? 

Is it possible to upgrade to TPMS sensors instead? 

I'm currently at a loss on what to do next... 

11 hours ago, avisonjohn said:

Does anybody else have any insight as to why the tyre pressure will not store, or why the error regarding the checksum is showing? 

That will be the reason the system fails to store the DDS settings.

11 hours ago, avisonjohn said:

If ABS Module, where is this located, and would replacing this potentially rectify the issue? 

The ABS module is the full brake hydraulic pump system. It's not practical to 'just' replace it. They are programmed to the car, and replacing it is unlikely to solve the problem.

11 hours ago, avisonjohn said:

Is it possible to upgrade to TPMS sensors instead? 

Anything is possible given enough time, money and know how. In reality a car built with out TPMS would be expensive to retro fit and finding the correct AsBuilt data could prove very difficult.

Your best option is to find one or two identical vehicles to yours. Then get the AsBuilt data for those and compare it against your information to see what the differences are. Have a look on autotrader and similar to find cars like yours. All you need is the registration number, I can tell you what the VIN number is.

 

Those wheels weren't standard.  They were a factory optional extra.

DDS may not have been original.  I had a 2012 Titanium without it (albeit on standard wheels), but enabled it easily using Forscan on mine.

Does your car have hill start assist?  I seem to remember something about the ABS modules without hill hold couldn't support DDS either, though that might have been a completely different model as my memory is hazy on it.

1 hour ago, unofix said:

That will be the reason the system fails to store the DDS settings.

The ABS module is the full brake hydraulic pump system. It's not practical to 'just' replace it. They are programmed to the car, and replacing it is unlikely to solve the problem.

Anything is possible given enough time, money and know how. In reality a car built with out TPMS would be expensive to retro fit and finding the correct AsBuilt data could prove very difficult.

Your best option is to find one or two identical vehicles to yours. Then get the AsBuilt data for those and compare it against your information to see what the differences are. Have a look on autotrader and similar to find cars like yours. All you need is the registration number, I can tell you what the VIN number is.

 

Thanks, I'll see if I can find similar vehicles.

I did come across one other guy online who had a similar vehicle, and shared a screenshot of his AsBuilt data for the ABS module, and it had the exact same data as mine originally (all the zero's).

Another website explained how to calculate the AsBuilt data, and said that the ABS data was essentially the characters of the VIN, translated to Hex, and the checksum on the end of each line.
I found another set of ABS AsBuilt Data, and the person's VIN, and calculated it into HEX values and it matched.

Given that, I then done the same with my VIN, and programmed it to the ABS module (after taking a backup).
ForScan accepted the new data, but it made zero difference to the issue.

Unfortunately, I now cannot revert back to the original data - ForScan throws up an error when trying to do so.....

 

 

1 hour ago, TomsFocus said:

Those wheels weren't standard.  They were a factory optional extra.

DDS may not have been original.  I had a 2012 Titanium without it (albeit on standard wheels), but enabled it easily using Forscan on mine.

Does your car have hill start assist?  I seem to remember something about the ABS modules without hill hold couldn't support DDS either, though that might have been a completely different model as my memory is hazy on it.

'Standard' was probably a poor choice of wording.

What I was getting at, was the fact that they are not some aftermarket Halford specials that some Boy Racer has put on the car, and look like regular Ford wheels which are fitted to lots of other Ford Focus.

I have Hill Start Assist, which works without any issues.

This has really got me stumped 😣

Hi - I have the EXACT same problem and have the same questions that you asked…. Did you find a resolution?