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any one shortened one/made one almost from scratch. my first atempt was nothing short of a disater but with a soldering iron i might get it to work.

any ideas, tips , anything! what i'm the most curios about is the seperate fuses for the engine how and were do people wire them in.

yes my spelling is shocking

Your best starting with the entire harness and cutting it down to suit. You would be in a world of trouble attempting to make your own harness from scratch... some of the sensor wires are sheilded to protect them from electical interfearance.

I assume your doing an EJ engine conversion. Everyone that does this cuts the factory EJ harness down so it only includes the wires needed to run the motor and sensors. As far as connecting them to power... i usually do this directly from the key barrel of the car.. obviously if you have an aftermarket imobiliser you need to wire it in after that. Also under the dash you can wire the EJ harness into the Oil pressure light, charge light, tacho and temp guage.

Dave

so assuming all sensors are wired up and power connected via the barrel there are no need for extra fuses?

shuffbag wrote:so assuming all sensors are wired up and power connected via the barrel there are no need for extra fuses?

Not unless your overly pedantic about looking after components - the standard fuses should look after everything without any worries of frying your ecu or other components.

Cheers

Bennie

The barrell is only fused by fusible links not fuses... you would need to add fuses between the barrell and your harness.

Dave

yes be sure you get the correct voltage through use of power leveling when making the harness.

I have trimmed my loom to the point i'm happy with it but im a little bit confused by adding power to the ecu.

i understand the "back up" (pin 15 onB126) needs to be hard wired, so it has power at all times. i'm going to wire that off the barrel befor the IGN switch.

now the main power (pin 2/13 on B126) i will wire after the switch so it only gets power when the IGN switch is on. but can i splice my main power in anywhere along the original wires connected to the two pins on the ecu?

also i have read http://www.d.umn.edu/~alex0219/Subaru/EA2EJ.pdf and im a little confused with the light green wire from the main relay.
does it have to be put through the ING switch then to the ecu or will the main power (being switched off through the IGN) be enough to kill the engine?

one last question from the fuel pump relay i have only one wire not connected (black with yellow line) i assume this goes to the fuel pump, how should i hook the pump up in conjuction with the relay?

I can help with all of this if im understanding what your asking correctly.

The light green wire coming from the main relay is meant to go back to the ECU and connect to the Thick yellow wire on your Fuel pump relay via a diode. This would have been like this originally unless you cut it off. It's not mean to be hooked up directly to ignition, don't ask me why, possibly due to relay backfeed problems.

I would splice your power feeds up near the relays (well thats what i do) all power wires should lead up that end of the harness (unless you cut em short). By thereoy it should not matter if you do it at the ECU end but don't cut the wire off and just join it on... the rest of the wire could lead to another part of the harness which requires power.

Fuel pump relay... the last wire you have there is the POSITIVE wire for your fuel pump. Joint that to the Positive side of your fuel pump and earth the other side of the fuel pump and it will work.... if everything else is wired correctly that is.

Dave

ok so i leave the light green wire as it is, i didn't give it the chop.

so splice in main power and the + to the pump and fingers crossed it will start today.

i'll either be frustrated or very very happy by the end of today!

the fuel pump relay ~ are you conversion guys using the diode protected relays to prevent funny feedback to ecu?

well im pissed, but i got spark
can't really figure it out. the fuel pump relay isn't working:mad:
fuel relay won't work and i can for the life of me figuer out why?????

what is this connection for? pic below, i have no connection off the loom to connect to.


also what is this for its off the ej loom 2 wire deal there is nothing for it to connect to on the engine side, there is also a 4 wire connecton to.

Nows the problem im afraid. Something has been cut that shouldn't have been or something is now not connected. It's almost going to be impossible for anyone over the net to help you fix this one i believe.

Only thing i can suggest is to connect both the engine test mode plugs to earth and turn ignition ON. This will pulse both the ECU controlled cooling fan and the fuel pump relay on and off. This might help instead of turning the car over every time to test the pump wiring.

There is about a million places where the problem could be and with not knowing what you have and have not cut off it's impossible for us to work out what your remaining plugs should or should not be plugged in to.

As far as the relays go.... on my own car i have normal standard relays. On the many other harnesses i have cut down they are using the factory relays.

Can you hear the fuel relay clicking at all?? If so then check the earth on your fuel pump.

Dave

SuBaRiNo wrote:Nows the problem im afraid. Something has been cut that shouldn't have been or something is now not connected. It's almost going to be impossible for anyone over the net to help you fix this one i believe.

Only thing i can suggest is to connect both the engine test mode plugs to earth and turn ignition ON. This will pulse both the ECU controlled cooling fan and the fuel pump relay on and off. This might help instead of turning the car over every time to test the pump wiring.

There is about a million places where the problem could be and with not knowing what you have and have not cut off it's impossible for us to work out what your remaining plugs should or should not be plugged in to.

As far as the relays go.... on my own car i have normal standard relays. On the many other harnesses i have cut down they are using the factory relays.

Can you hear the fuel relay clicking at all?? If so then check the earth on your fuel pump.

Dave

Joisus Dave, your freaking me out with all this - Well, til I do my own conversion some day hopefully soon.

Hope you get it sorted without any trouble shuffbag.

Bennie

no i don't belive i have
due to the fact when i first trimmed it down i didn't touch the engine wiring that side of the grommet. so i should have hade all plugs. it isn't the orig loom i botched that, so maybe i recived the wrong loom from the wrecker???(i doubt it tho).

the main relay clicks.

fuel pump realy doesnt, it has power but the ecu must not be switching it on.

i still have my box of botched loom so hopefully fingers croosed the plug can be found and traced back, and it may just be a case of the plug from my new loom is another shape. ie that un-identifyed plug from my new loom(2 wire jib) connects to the blue plug from the engine. then its just a simple case if snip and replace plug.

little q for you SuBaRiNo,

even tho you use the L's factory wiring for the starter does the wire from the ej22's ecu (b127 pin 10) need to be tapped into it?

Im not sure on your pin numbering system but yes there is a Starter wire on the ECU that needs to be patched into your existing starter motor wire at the key barrel. This GREATLY effects the engine starting by adjusting the timing and things to assist in cold starts.

Bennie when it comes to your conversion... post me the harness and i will trim it and send it back.

Dave

SuBaRiNo wrote:Bennie when it comes to your conversion... post me the harness and i will trim it and send it back.

Thanks mate! Sure you don't wanna come over here for a holiday

I'll let you know what the go is when i'm getting stuff together.

Thanks for your offer

Bennie

http://images.benandmichelle.net/thumbnails.php?album=7 this is where i was getting my pin outs. i'll tap the ecu to the starter wiring this weekend and try again.

well i now have a running ej22 in my engine bay:)

i had two power wires bridged (wire that i added not realising) causing the injectors to stay open, spark is happening now with the connection of one wire...... but fuel pump relay isn't working??? does the black wire (with red stripe from relay) go to the + on the pump, and - earthed to body of the car?

or should the balck wire be wired onto the - of the pump, and a new + wire be added from the harness to the pump?

i currently have the pump hard wired to the "on" possition of the ignition alowing the car to run.