ITP has a good bit of info on AE. They used to have a forum specifically for AE, but not sure that's still there.

When you connect to the vehicle, select ABS module instead of 7.3L Powerstroke. I think that's correct. That will give you access to the ABS system tests including tire size calibration. To get back to the PCM, you have to disconnect and reconnect using the 7.3L Powerstroke selection.

The one downside of AE is that you have to be plugged into the vehicle to even get into the program to see the options. So, I'm going on memory (not necessarily that great anymore.)

 

Here is something I put together to show some features of AE.

AE Screenshots

Page 13-16 should show you how to access the ABS module, and recalibrate the Speedometer.

Note: You need to measure the ACTUAL tire height, not the size it is supposed to be. If you use a level on the top of the tire and measure the height, you will have really accurate results. I use a GPS to verify the speed, then tweak it to get the odometer on using the calibrated markers on the freeway. Works pretty good.

 

Thanks guys for the good info! I was stuck on 7.3 Diesel, didn't realize I had to change it that early in.

Note: You need to measure the ACTUAL tire height, not the size it is supposed to be. If you use a level on the top of the tire and measure the height, you will have really accurate results. I use a GPS to verify the speed, then tweak it to get the odometer on using the calibrated markers on the freeway. Works pretty good.

Thats exactly what I planned on doing. I already had it recalibrated several years ago at a Ford Dealer but when I got a GPS I noticed it was off about 1.5 mph at freeway speeds. Now with AE I can tweak it til I'm satisfied. :thumbsup:

-Todd

 

Nice Job WNT!

 

Ok, I recalibrated the speedo with AE and now its worse than before. I had a Ford tech adjust it with Rotunda several years ago when I first installed the tires, but he didn't punch in the right number so its always read about 1.5 mph slow at 65 mph. The tires are 295/75R16 BFG A/T. I measured the diameter as they sit on the ground and got 32.625" (BFG lists outside diameter as 33.20"). For some reason AE will only allow 32.25" and then jumps all the way to 33.00". I tried both and of course one reads to fast and the other reads too slow.

Part of the reason I got AE was the ability to recalibrate the speedo for different tire sizes. It says on the website any tire size up to 40". But i guess thats not entirely true. So, does this mean I have to go to Ford now to get it done right?

-Todd

 

Part of the reason I got AE was the ability to recalibrate the speedo for different tire sizes. It says on the website any tire size up to 40". But i guess thats not entirely true. So, does this mean I have to go to Ford now to get it done right?

That's a limitation of what's programmed into the ABS module, IIRC, not a fault of AE. It's just using the selections that are available in the ABS module. I think Ford will run into the same problem. I think Ford uses revolutions per mile in their display, but the tire diameter is just a recalculation of rpm.

 

I thought AE let you change tire sizes in .25" increments. It has been a few months since I have done it, but that is what I remember.

 

Its kind of sporatic (sp?). For instance, here's your options between 32" and 35": 32.00, 32.25, 33.00, 33.25, 33.50, 34.00, 34.50, 35.00. If it in fact was every .25" I'd be in good shape.

That's a limitation of what's programmed into the ABS module, IIRC, not a fault of AE. It's just using the selections that are available in the ABS module. I think Ford will run into the same problem. I think Ford uses revolutions per mile in their display, but the tire diameter is just a recalculation of rpm.

I do understand what you are saying, except that it was alot closer to the correct MPH after Ford did it using Revs Per Mile. Now I'm off be twice what it was before. I have the procedure printed out for the Ford NGS tool and sounds like you can punch in any number you choose for Revs Per Mile.

Thanks for the quick response guys, I appreciate your help.


-Todd

 

Ford's software to calibrate the speedo changed around the 2005 model year, from revs/mile to tire size. It's not the ABS module but the software in the speedo calibration tool that is the problem.

If you can find an old NGS scanner (some old Ford techs still have one) with software that was used before the 2002s came out, you can use the old instructions to calibrate the speedo to the exact tire revs/mile, i.e. between 601 to over 700. Stock size tires were 655, premium stock-size tires including my Michelin XPS were 650, 285s were 636, 295s were 626, and 315s were 601. Well 315s were actually about 597, but the smallest number the ABS module would accept was 601. Here's the instructions from about 8 years ago:

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If your dealer's tech hasn't calibrated a speedometer on a SuperDuty before, he might spend an hour researching on how to do it before he actually does any work. After he has done a couple, then it's a 5-minute job – but most dealers will charge you one hour of labor to do the job.

If your service writer sounds like perhaps that dealership is not experienced in calibrating SuperDuty speedos, then copy and paste the following into a Wordpad or Word document, print it out, and give it to the service writer.

1) Ensure all harness connections are plugged in.

2) Using Rotunda New Generation Star (NGS) scanner and Version 3.2 or higher Service Card, Plug into the DCL connector.

• [ADDED: Do not use a service card version later than early 2001 model year. This will not work if you try to use a service card dated after the 2002 models came out. ]

• [ADDED #2: Ignore the above "ADDED" if you use the newer NGS Plus. With the NGS Plus you can calibrate the speedo on any 7.3L or 6.0L PSD.]

• [Added #3: Some techs now use the Ford Worldwide Diagnostic System (WDS) to calibrate the speedo. I don't know anything about how they do it.]

3) Turn Key on w/Engine Off.

4) Select Service Bay Functions

5) Select ABS Module or 4WABS Module depending on application.

6) Select Tire Size/Axle Ratio Configure.

7) Enter tire manufacturer's specification of revs/mile (tire revolutions per mile) into the NGS as the REV.PER MILE figure.

• [ADDED: To have an even more accurate odometer, enter the following rev/mile:

For 285/75R16 tires enter 00636
For 295/75R16 tires enter 00626
For 315/75R16 tires enter 00601

Do not try to enter a number less than 00601 with the old NGS. With the newer NGS Plus or WDS, I don't know. ]

8) Select Tone Ring size and verify that 120 is programmed in.

9) Select <Option> and press TRIGGER.

10) Select <Vehicle> and press TRIGGER.

11) Press <Done> and the Module will be reprogrammed.

12) Check Speedo accuracy.

To determine your odometer’s accuracy (if you don't have that fancy newfangled GPS stuff) just find an interstate highway that has two mile markers 10 miles apart without being near an entry, exit, bridge, or overpass. When your front bumper passes one of these markers, push the odometer reset button to zero. Ten miles later, your odo should read exactly 10.0, which is 100 percent accuracy. Every tenth of a mile off from 10.0 is one percent error.

Some Ford dealers will refuse to calibrate the speedo. They say it can't be done - or that they're not allowed to do it. So in that case just refer them to the 2003 Ford gobbledegook version of the procedures at:

http://www.fleet.ford.com/truckbbas/non-html/2003/bb_pdf/206.pdf

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Big surprise! The link to the 2003 Ford gobbledegook version of the procedures still works. :jester:

 

Thanks Smokey! What the hell would we do without you.

In fact, those are the exact instructions I have printed out. Probably from one of your previous posts back in '04.

My speedo was originally recalibrated by a Ford dealer several years ago (2004) when I first got these tires. I gave the tech the number I had calculated by measuring the roll out on my tires. But, he decided to put in his own number based on my tire size, which was a few revs per mile different then what I calculated. Unfortunately, I didn't find out until a couple years later when I got my TomTom that its slow by 1.5 MPH at 65 MPH. I was kind of hoping to get it dead on, I'm anal like that :thumbsup:.

I plan on going to 315/75R16's when these wear out next spring. Maybe I'll just wait until then to worry about it.


-Todd