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It's truely and actually is a 1997 motorhome. I have the hydroboost on the firewall. The last gasp of the 460's. Yes, it's a BOX0. What is SD48E hardware?
Your EEC-IV has some specific information on it:
EEC-IV: Electronic Engine Control version 4
EFI-SD48E: Electronic Fuel Injection - Speed Density E4OD ( SD48E: 7.5l, SD48B: 5.8l, SD47A: 6cyl) *note* this is my interpretation
F6TF-12A650-AJA: Engineering number(F: decade, 6: year, T:model, F:department, 12A650: base part number, AJA: revision
BOX0: calibration/strategy/software code running on the hardware(EFI-SD48E).
Basically all SD48x hardware are the same, the software is different.
Your EEC-IV has some specific information on it:
EEC-IV: Electronic Engine Control version 4
EFI-SD48E: Electronic Fuel Injection - Speed Density E4OD ( SD48E: 7.5l, SD48B: 5.8l, SD47A: 6cyl) *note* this is my interpretation
F6TF-12A650-AJA: Engineering number(F: decade, 6: year, T:model, F:department, 12A650: base part number, AJA: revision
BOX0: calibration/strategy/software code running on the hardware(EFI-SD48E).
Basically all SD48x hardware are the same, the software is different.
Mine has EFI-SD48E7C18 on it. Does that make a difference?
Mine has EFI-SD48E7C18 on it. Does that make a difference?
Everything makes a difference.
You really want BOX0 if your looking for a replacement.
Other SD48E will work, if they are in good working condition, but the fuel maps, emissions, and shift points may or may not be different.
I put an EEC-IV SD48B from a F250 in my F150, and it shifted horribly.
Probably due to the software/calibration/strategy differences (fuel map, shift points, etc) of having a heavier truck EEC in a lighter truck.
Everything makes a difference.
You really want BOX0 if your looking for a replacement.
Other SD48E will work, if they are in good working condition, but the fuel maps, emissions, and shift points may or may not be different.
I put an EEC-IV SD48B from a F250 in my F150, and it shifted horribly.
Probably due to the software/calibration/strategy differences (fuel map, shift points, etc) of having a heavier truck EEC in a lighter truck.
If I order one from some online company how does the BOX0 come into play? I've called several companies and they only asked for the F6TF number. Even when I called the Ford dealerships they didn't ask about the BOX0 number.
If I order one from some online company how does the BOX0 come into play? I've called several companies and they only asked for the F6TF number. Even when I called the Ford dealerships they didn't ask about the BOX0 number.
It's this number F6TF-12A650-AJA, specifcally the -AJA part, is the revision, emissions, etc.
They have parts books that reference the engineering numbers and emission calibration numbers, not the strategy numbers like BOX0, BCC0, etc.
It's this number F6TF-12A650-AJA, specifcally the -AJA part, is the revision, emissions, etc.
They have parts books that reference the engineering numbers and emission calibration numbers, not the strategy numbers like BOX0, BCC0, etc.
Ok. It makes sense now. Last time I dealt with an ECU problem like this I went to the salvage yard and pulled one with the right color grommet and all was good. Thanks for the help and education. I may be able to get this anemic road slug moving again.
Last edited by Move_N_Man; Mar 3, 2026 at 04:09 PM.
Reason: Left out a word.
Hello, looks like some people in this thread of some experience with this already so maybe I can post my question here instead of wasting thread title space on a new post.
I have a 1994 F700 (medium duty according to Ford) service truck with a 7.0L (429ci) gasoline, auto transmission, single speed rear differential that has burned a hole in its ECM board. The ECM has the following info on it:
Apparently this is a unicorn, because locating the "F1TF" ECM to replace it yield little to no results. What are the thoughts on getting a F2TF-12A650-HA and slapping it in there? or F3TF or F4TF if available? Looks like the engine went to a 7.5L in the later dated models, which may just mean the computer will be trying to figure out where all the intake air is at? fuel compensation? but not fail catastrophically (as long as firing order is the same, or wire my spark plugs how the ECM wants them to be).
I have a request for the exact part with ModuleExperts, so they're on the lookout for me as well. Hometown dealer couldn't help and recommended a few truck places around which so far have all told me the same story of "F1TF is available right now." I had tried sending the unit for a rebuild, but CarComputerExchange deemed it "non-repairable, unit has major damage to board from blown caps, cannot repair" (any other recommendations, but I dont think anyone will agree to fix it with the hole being in the board).
I should also include: I went to rockauto to see if they had a replacement, they had BlueStreaks BSE EM8359 listed, but unavailable. Within the information part of the item, it says "OEM / Interchange Numbers: F4TF12A650CFA, F4TZ12A650CFA, F4TZ12A650CFB." Is the ECM in my truck a replacement that someone had swapped in at some point? Am I ok to order one of these ECM's through someone like Flagship 1, or whoever has it, and feel confident that it'll work?
Last edited by andreleplattenier; Mar 24, 2026 at 04:02 PM.
Hello, looks like some people in this thread of some experience with this already so maybe I can post my question here instead of wasting thread title space on a new post.
I have a 1994 F700 (medium duty according to Ford) service truck with a 7.0L (429ci) gasoline, auto transmission, single speed rear differential that has burned a hole in its ECM board.
Oohh!! Exciting! I have only read about the code in these.
Yes, a unicorn indeed. The uniqueness of this one, being 7.0/429 is that it as code for a governor that is enabled.
If you use that, then you will need that. If not, then I would assume that a 460/7.5 'should' work, but might not have the hardware to run the governor.
Can you post a picture of the inside of the board please?
hmmm. Truck history: Viacom comms truck in California, so it makes sense a governor would be installed. I personally wouldn't take this thing over 55 mph out of fear, so I wouldn't need the governor to be enabled...
This is what was staring at me when I opened it up after getting it back from CCE. I can get more/other photo if needed.
hmmm. Truck history: Viacom comms truck in California, so it makes sense a governor would be installed. I personally wouldn't take this thing over 55 mph out of fear, so I wouldn't need the governor to be enabled...
This is what was staring at me when I opened it up after getting it back from CCE. I can get more/other photo if needed.
Did they say they couldn't fix it?? and sent it back?
Looks fixable to me.
They sent "non-repairable, unit has major damage to board from blown caps, cannot repair." So either they couldnt, didnt want to, or didnt want the hassle I figure. I'm still 9 days away from being able to send PM's so if you'd want to wait until then instead of replying back and forth on this thread, I am ok with that. Or I'll gladly keep working through it here.
