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1st gen Batch Fire Injection to Sequential electronic injection swap

Discussion in 'Modified 1991-1994 Explorers' started by jd4242, October 1, 2014.

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  1. jd4242

    jd4242 Explorer Addict

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    Im going to be attempting to swap my 94 ranger batch fire ecm out with a 94 explorer SEFI ecm

    94 explorer diagram (one injector is mislabeled but is correct in 2nd diagram with pin out)

    [​IMG]



    94 explorer ecm pin layout

    [​IMG]

    [​IMG]

    [​IMG]
     
    Last edited: October 2, 2014
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  3. jd4242

    jd4242 Explorer Addict

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    94 RANGER with batch fire wiring diagram and pin out list..

    [​IMG]

    [​IMG]


    Here is what I have so far..these are the pins that need to be moved or not used anymore on my current 94 ranger ecm wiring harness, so a 94 explorer ecm with SEFI can be used

    OLD location......NEW repined location
    31----->11. Canister purge
    14------> 50. MAF
    15----->9. MAF
    52----->51. Shift solenoid
    39----> 43. O2#2
    29----> 44. O2#1
    44---->29. Shorting bar
    28 ----> 18 data +
    9 ------> 19 data -


    58---old injector, unplug discard wire, no longer used..that pin will be used with new injectors
    59--- old injector, unplug, discard wire, no longer used..that pin will be used also with new injectors


    New injector pins..
    58---injector#1
    59---injector#2
    39---injector#3
    35---injector#4
    15--- injector#5
    12---injector#6

    New pins also
    33--egr (how can I get around this??)
    27--- DPFE (how can I get around this??)
    24---camshaft sensor


    Anyone see anything else???


    EDIT..updated with missed items
     
    Last edited: October 2, 2014
  4. jd4242

    jd4242 Explorer Addict

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    Going to put a 90-93 explorer diagram here when I find it for those that wanna do this to a first gen explorer..

    To be posted...
     
    Last edited: October 2, 2014
  5. 2000StreetRod

    2000StreetRod Staff Member Moderator Elite Explorer

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    injector numbers

    The injector numbers are the same as the cylinder numbers.
    The injector wire colors and PCM pin numbers on the diagram I found matches the diagram benjam provided you.
     
  6. Benjam

    Benjam Active Member

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    Is it possible the top diagram you posted Jd is from a cali truck?
     
  7. jd4242

    jd4242 Explorer Addict

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    Possible. .but the one you posted said 94 and it showed SEFI also...They all seem to match up but first diagram shows two number 58 pins both showing tan as the color. .it doesnt show pin 39 or injector color brn/yel injector number 3..everything else seems the same but my eyes are getting tired!!!
     
    Last edited: October 2, 2014
  8. Benjam

    Benjam Active Member

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    Somethings wacky with that first diagram is the reason I ask. Where did you get that one from? So far the second one and mine seem to match up
     
  9. jd4242

    jd4242 Explorer Addict

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    Last edited: October 2, 2014
  10. jd4242

    jd4242 Explorer Addict

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    I have a fed emission ecm on the way...if it doesn't have the pins for SEFI injectors ill guess ill know the answer...im 100% in for this project and appreciate any help or input.....:)
     
  11. 2000StreetRod

    2000StreetRod Staff Member Moderator Elite Explorer

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    federal vs Calif.

    The wiring diagrams I have access to for the 1994 Ranger show batch for the federal version and SFI for the Calif. version. There is no distinction made for the 1994 Explorer - all are SFI.
     
  12. jd4242

    jd4242 Explorer Addict

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    Thanks ;)


    I have circled 9 changes other than the injectors but not 100% on the numbers.doesnt seem to be a very hard job and as soon as the new ecm comes in and im 100% on the wiring, ill swap it over..I plan to take my upper manifold off anyways to replace driverside valve gasket and to test fit the charger soon..so would be perfect time to do this swap ;)
     
    Last edited: October 2, 2014
  13. 2000StreetRod

    2000StreetRod Staff Member Moderator Elite Explorer

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    94 federal PCM?

    I assume that is an Explorer PCM with SFI to replace your Ranger PCM with batch injection.

    Are you modifying the Ranger engine wiring harness to match the Explorer PCM? I want to help but I'm not sure exactly what you're doing.
     
  14. jd4242

    jd4242 Explorer Addict

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    Yes I bought a explorer 94 fed emission manual ecm ( F47F-12A650-KB) to replace my batch fire 94 ranger ecm..

    Yes im re-pinning the items I listed and adding the pins I listed to match a 94 explorer ecm.(my ecm is on the driverside or I would use a 94 explorer engine harness). ..then rewiring the injectors, adding a cam sensor and idk what im going to do about the egr..I dont have or want egr, it may be possible to delete it when I get to tuning but for now I may just grab a egr vacuum sensor and plug it in so I dont get a CEL..
     
    Last edited: October 3, 2014
  15. 2000StreetRod

    2000StreetRod Staff Member Moderator Elite Explorer

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    94 Ranger Federal PCM

    OK, I'll check your changes list when I get a chance. Here's a pin out for your stock Ranger PCM.
    94RangerPCM.jpg
     
  16. jd4242

    jd4242 Explorer Addict

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    Aww much easier to read..thank you ;)
     
  17. 2000StreetRod

    2000StreetRod Staff Member Moderator Elite Explorer

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    PCM change additions

    old .. new
    28 > 18 data +
    9 > 19 data -

    New
    33 EVR
    27 DPFE
     
  18. jd4242

    jd4242 Explorer Addict

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    Aww thank you sir, I was sure I was missing something. .

    Is there anyway of getting around 33&27? Like tricking the ecm so a CEL doesnt come on?? Maybe ill search for what voltage those read when working properly. .more than likely I can have them deleted when I get tuned.
     
  19. 2000StreetRod

    2000StreetRod Staff Member Moderator Elite Explorer

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    simulating EGR

    The EVR signal is an on/off output from the PCM that controls the EGR vacuum regulator. Its similar to pulse width modulation. The DPFE signal is a variable voltage input to the PCM that indicates the amount of EGR flow. The PCM is constantly adjusting the duty cycle of the EVR signal to control EGR flow. EGR is disabled for idle and WOT but otherwise varies according to engine parameters (possibly load, RPM, etc.). When the EGR flow (as indicated by the DPFE voltage) does not match the commanded duty cycle the PCM sets a DTC. The PCM does not have the ability to determine which thing isn't working (EVR, EGR valve or DPFE sensor). The closed loop system could be simulated but its not worth the effort. As I recall, if you have an EVR and a DPFE its possible to trick the PCM into thinking the system is functional even when there's no EGR flow. It would take me a while to find that reference.
     
  20. jd4242

    jd4242 Explorer Addict

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    So does the dpfe run off vacuum? ? Then the ecm reads that and sends signal to EVR telling it how much to oepn the egr ? If so couldnt I just hook a DPFE up to a vacuum sorce and not even worry about the EVR sense it doesnt send a signal back to the ecm?
     
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  21. Turdle

    Turdle Habla tortuga Staff Member Moderator Elite Explorer

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    The DPFE measures a differential in pressure between the 2 tubes. No vacuum used.
    The pressure difference results when the egr valve opens.
     

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