EJ22T ECU Driving an EJ20G Engine (long)

[milehial2000]

The pin locations are different but the individual pins in the plugs
can be moved. If you release the small retainers on the wire side of
the plug and insert a small pin like tool into the end that plugs into
the ECU the individual pin can be released,removed and inserted into a
different location or into some of the yellow plugs. On the engine
wiring I found that the best way to find out what wire goes where is
with a small multimeter and check all of them from the device plug to
the ECU. On the engine I am working on I found three extra wires
in the 1.8 harness that went to the engine plugs but stopped there and
were not used, these and the wires that were used on the 1.8 for FICD
and EGR I extended and used for the turbo control devices along with
two new sheilded wires (Teflon jacketed I can get this and it is worth
it for these items reliabilty let me know if you want some))for the
knock sensor and pressure sensor. Other than that about the only other
thing I can remember having to change is the wiring for the turbo
Legacy MAF. The extra wires can be pulled down from the engine
compartment all together by puncturing and making a small hole in the
rubber boot on the engine side and feeding a small solid wire first
and then pulling the other wires down behind the heater box. (yes a
little difficult but this can be done) One thing you will find changed
on the 1.8 harness is the grounding. the 1.8 has a common ground for
most things and this terminates with a red/green wire at the ECU on
the cars that I have seen. I have used this grounding system and tied
any extra ground wires together with no problem.This is about all I
have for now I will be finishing the last of this project in the
morning and will let you know if I find anything significant.
AL(CO)



--- In BC-BFLegacyWorks@y..., "limonoah" <limonoah@h...> wrote:
> Its true that both ECUs have the same plugs (4 plugs: one with 26
> pins, one with 16 pins, one with 12 and one with 22), but are the
> actual pin locations the same for both? From the wiring diagrams i
> have seen of the EJ22T and the EJ20G, some of the pins are used for
> different things. Does anyone know for sure that the pin locations
> are the same? Noah
>
>
> --- In BC-BFLegacyWorks@y..., "William D. Robinson"
<vultureboy@m...>
> wrote:
> > This is what I have heard, from folks who have done the swap, but
I
> have never done it myself. First of all, I know from personal
> experience that the ECU plugs are all the same, from wiring my AVC-R
> using just the EJ20 diagrams. If you want to use an EJ22T ECO to
> drive an EJ20, you have to use a fuel controller to shorten the
> injector pulses, as the EJ20 has bigger injectors and the EJ22T ECU
> will be running the injectors too often. Also, you have to use the
> coil packs off an EJ22T or even better, the coil packs off an EJ25.
> The EJ20 coil packs in the spark plugs won't work with the EJ22T
ECU.
> >
> > Bill Robinson
> > 92 Legacy Turbo with a few modest street mods


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