4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

94 Computer

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Old Mar 7, 2018
  #1  
cwrong2002@yahoo.com's Avatar
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From: Lonedell
Icon13 94 Computer

Does anybody know where can buy a computer for my 94 4x4 4.0?
 
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Old Mar 8, 2018
  #2  
RonD's Avatar
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From: Vancouver, BC
Welcome to the forum


Most auto parts stores can order them, on-line parts also usually list them

1994 4.0l matters
4x4 doesn't matter in 1994
Manual or automatic trans does

Part number will start like this: F47F-12A650
F4 = 1994
7F = Ranger electric
12A650 = Fords generic part number for ALL engine computers, still used today, a 2018 Ford car will have a 12A650 computer part number.

Google: F47F-12A650 4.0l

1994 Mazda B-4000 used same computer, 4.0l but still need to match trans

The last numbers(after 12A650) vary, they are the firmware and software versions, Ford never released a decoder for these numbers/letters

There will also be a larger STAMPED numbers/letters on the label, thats the Final software version loaded on to computer when vehicle was assembled


It all doesn't need to match exactly, the last numbers/letters that is

1994, 4.0l engine, manual or auto trans are the big ones, 1993 will work
EGR or NO EGR is also important, only Calif. 4.0ls had EGR

4x4 didn't matter in 1994 it used a separate module that isn't connected to computer

The EEC-IV computer in the 1994 and older Rangers generally didn't have any problems, but what could happen is that one or more of the 3 Blue capacitors on the circuit board could leak after 20+ years.
These can be changed, not too hard and costs under $5
Read here on that: http://support.moates.net/capacitor-...-ford-a9l-ecm/
A9L is an EEC-IV computer, just different software for V8 engine
 

Last edited by RonD; Mar 8, 2018 at 11:23 AM.
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Old May 13, 2024
  #3  
RDudo's Avatar
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Joined: May 2024
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From: Galloway, NJ
Originally Posted by RonD
Welcome to the forum


Most auto parts stores can order them, on-line parts also usually list them

1994 4.0l matters
4x4 doesn't matter in 1994
Manual or automatic trans does

Part number will start like this: F47F-12A650
F4 = 1994
7F = Ranger electric
12A650 = Fords generic part number for ALL engine computers, still used today, a 2018 Ford car will have a 12A650 computer part number.

Google: F47F-12A650 4.0l

1994 Mazda B-4000 used same computer, 4.0l but still need to match trans

The last numbers(after 12A650) vary, they are the firmware and software versions, Ford never released a decoder for these numbers/letters

There will also be a larger STAMPED numbers/letters on the label, thats the Final software version loaded on to computer when vehicle was assembled


It all doesn't need to match exactly, the last numbers/letters that is

1994, 4.0l engine, manual or auto trans are the big ones, 1993 will work
EGR or NO EGR is also important, only Calif. 4.0ls had EGR

4x4 didn't matter in 1994 it used a separate module that isn't connected to computer

The EEC-IV computer in the 1994 and older Rangers generally didn't have any problems, but what could happen is that one or more of the 3 Blue capacitors on the circuit board could leak after 20+ years.
These can be changed, not too hard and costs under $5
Read here on that: http://support.moates.net/capacitor-...-ford-a9l-ecm/
A9L is an EEC-IV computer, just different software for V8 engine
hey! I’ve read your posts in other threads saying the automatic ecm will throw codes that aren’t relevant to the manual. But will the auto ecm still work for other codes that the manual shares? For example, I have a ‘93 manual and I believe I have the automatic computer since it’s throwing a 629 (torque converter clutch circuit). But it’s also throwing a 411 (ISS) which the manual has. So can I ignore the codes that are for an automatic and trust the codes that the manual also has? Or are all the codes wrong?
 
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