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I think I have a problem with my ECM IV. The symptoms are engine cranks but barely runs. Exhaust is smokey and smells very rich. Fuel pumps both come on when the ignition is turned on but they both stay on. ODB I port doesn't work.
I think it is the ECM. The original part is F6TF-12A650-AHA. My truck is a 1996 Ford Truck-F250 EFI, 7.5L,4x4, E4OD transmission, Federal version. I took the original one apart and the caps had some leakage and I changed them out. I inspected the traces and don't see any problem. There was a little corrosion on some of the FET's but it didn't seem to be bridging. There was one resistor that was burned out. I couldn't read it to be sure of the value but I looked closely at some pictures of ECM-IV parts on-line A little corrosion on FET and caps Fried resistor Part number label and I think it was red-black-red. I replaced the resistor, I think it starts a little easier but the fuel pumps still stay on and it runs rich, no ODB-I either.
I have ordered replacement parts from three different companies now and all three have sent me the wrong part. All three were different and all three were some version of ECM-V,
I am looking for any other suggestions on troubleshooting my ECM or a reliable supplier that will sell me a working part.
I think I have a problem with my EEC-IV. The symptoms are engine cranks but barely runs. Exhaust is smokey and smells very rich. Fuel pumps both come on when the ignition is turned on but they both stay on. ODB I port doesn't work.
…all three were some version of EEC- V,…
Fixed that for you. The system is electronic engine control- EEC
There have been a few threads where the computer was still not functioning after replacing the capacitors and/ diodes.
I don't have the skills to replace parts on a board and expect the board to start working. I do have search skills and eBay has a few listed. Expect $400.
I have owned my 95 F250 since 1997 and I am building up my spare war chest. You should have a spare EEC-IV computer on the shelf.
I don't have the skills to replace parts on a board and expect the board to start working. I do have search skills and eBay has a few listed. Expect $400.
I have owned my 95 F250 since 1997 and I am building up my spare war chest. You should have a spare EEC-IV computer on the shelf.
I have owned mine since 2000. It's been very reliable up to the last year but time is definitely catching up to it. I just replaced the auto locking hubs with manual ones a couple months ago, got lazy and paid for a brake job after doing the last one myself.
I completely agree with getting a working spare. Prices are getting crazy for these and they are very hard to find.
I have located a F6TF-12A650-AJA The base board is EFI-SD48E7K05 Calibration code BOX0, my original is a F6TF-12A650-AHA Baseboard EFI-SD48E Calibration code ALT0. I think the bottom line on the label is a software build number, they are also different.
I have seen that the -AJA BOX0 is probably backward compatible with the -AHA ALT0 but I am wondering what the difference is.
Last edited by Ford4meOnly; Jun 11, 2026 at 05:25 PM.
I don't have the skills to replace parts on a board and expect the board to start working. I do have search skills and eBay has a few listed. Expect $400.
I have owned my 95 F250 since 1997 and I am building up my spare war chest. You should have a spare EEC-IV computer on the shelf.
I worked as an electronic technician while I when to college and developed some mad skills. Repaired many old military boards so I am used to the conformal coating.
I agree with you that I need to get a spare board working, so my plan is to purchase some used board and upgrade it to get the truck running, then work on the old board. Prices are really jumping up fast as these boards go obsolete.
Are those pics after or before you replaced the caps?
Burnt resistor should be same as the circled one I believe.
I have been looking at YouTube videos and came across one by @shago066 that was clear enough that I could see the resistor values on the EEC.. It is a F3TF-12A650-JA. @shango066 says it came from a "Big Block Gas Hog Carbon Pump", sounds like my 7.5L.
I attached a screen capture from the video. All the components match my board and the resistor that burned on my board is a red-black-red-gold (2K, 5%, 1/2 watt metal film).
I also checked continuity, and the burned out resistor is connected to pin 4. This goes to the Ignition Control Unit, so I am going to change it along with the EEC. (Sorry for the cross post, I found an EEC thread later).
[img alt="Capture showing the whole board and part number
"]https://cimg2.ibsrv.net/gimg/www.ford-trucks.com-vbulletin/1782x1006/whole_eec_36c52b34a90566c27b122c41af0bb586271e8886 .png[/img] Capture showing the whole board and part number
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1996 ECM-IV
The system is electronic engine control- EEC
