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ECU problems

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  #1  
Old 05-17-2018, 09:44 PM
frankosd
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ECU problems

So I picked up a whole entire wiring harness out of a 94 F150 the harness is uncut and the ECU is JAB1 (F4TF-12A650-ARB) (EPAF-14A624AA) that's the info I got from the ECU. My intentions were to swap the harness and ECU on to my 92 F150 Flareside which has the 5.0 and e4od transmission non mass air. The 94 F-150 had the 5.0 motor mass air thinking that it had that e4od transmission. I took out the harness until now that I ran the info of ECU out of the 94 which gives me a different transmission than mine which is 4R70W. I guess my question is can I run this ECU with my e4od. Or can I use the harness itself with the mass air system with a spare ECU that I have which is RAN2 (F5TF-12A650-AEC) which I got this ECU out of a 95 F150 with the 5.8 e4od transmission can I use the harness out of the 94 with this ECU since it's for a e4od. Since my transmission in my truck it's needs a rebuilt I was thinking this is a good time to do the harness Swap and the ECU hopefully I didn't get you guys mixed up or confused any info any feedback will be gladly appreciate.
 
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Old 05-17-2018, 10:13 PM
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No. 4R70W ECU will not work with the E4OD.

I don't think your 5.8 ECU will support MAF.
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Old 05-17-2018, 10:22 PM
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Thanks for replying. My other question is can I used the harness with the 5.8 ecu which was out of a truck with mass air.
 
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Old 05-17-2018, 10:53 PM
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There are a few things that are not clear here.

I expect your goal is to support MAF and your E4OD.

You are correct when you recognized that the 4R70W strategy will not support the E4OD. I believe there even may be hardware differences with the ECU as the E4OD requires an extra control line.

MAF engine strategies are more adaptable than SD and engine displacement may not be a significant factor, but the wiring harness and the ECU must both be MAF. You cannot mix SD ECU's with MAF wiring harnesses.

One issue may be that your 92 was originally equipped with the 60 pin SD ECU. Much of what you will find in later model F series MAF hardware will be OBDII with the 104 pin EECV ECU. This will not be plug and play in your EECIV equipped truck.
 
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Old 05-18-2018, 07:44 AM
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Originally Posted by NotEnoughTrucks2014 View Post

One issue may be that your 92 was originally equipped with the 60 pin SD ECU. Much of what you will find in later model F series MAF hardware will be OBDII with the 104 pin EECV ECU. This will not be plug and play in your EECIV equipped truck.
OBD-II was not introduced until the 1996 model year on the F-series/Bronco. That is not an issue for this swap.
 
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Old 05-18-2018, 07:50 AM
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Swapping harnesses in between model year vehicles has it's problem, let alone the differences between Speed Density versus MAF. Ford has a habit of changing functions on the pins as it relates to interfacing with the rest of the vehicle. None of this is going to be plug-n-play.

Do you know if the 1995 5.8L PCM requires two O2 sensors or does it use 2? I suspect the latter. You also need to determine if the EGR feedback signal is positional (EVP sensor on top of the EGR valve) or flow (DPFE). If it is DPFE then you need the associated EGR pieces to make it work. Or you may find this PCM is supported by aftermarket tuners to turn it off.
 
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