There isn't much info because you don't need much. It really is that simple when you break it all down. There is a post on here EJ swap 10 wires or something like that. I just completed another EJ swap harness and the engine starts on the floor with only 2 wires once it is all plugged in. Constant power and key switched power. The rest of it you just have to figure out. Here are some notes I have collected from posts on here from all of us, un-edited, and in no order. Credit to the original authors is left in place where available. I didn't write it, but it is full of good info. Care to clean it up go ahead.
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care to mention those 10 wires here? I am just trying to see if I got my harness right.
So far I got:
Radiator Relay
VSS
Fuel Pump
Power to Fuel Pump/Main Relay
Neutral Position Switch
Check Engine Light
Starter Wire to the ECU
Ignition Wire to the ECU
Test Mode Connector(? technically already on the donor by itself)
Tach Signal
anything I am leaving out?
You're gonna want temp, and oil pressure, i wired in a fan seperate, as its much easier than integrating the both together. unless its OBDII, you don't need the VSS. The neutral position switch is over rated, and the test mode connectors are all there, the single green and black connectors. Tach signal is a black blue wire, you'll have to look very carefully cause it just looks like any other black wire.
You need to find the yellow wire from Coil and Igniter, and reconnect it to the Ignition switched wire for the Ig. Relay. (that wire should also have been a yellow feeding a few sensors and solenoids power, and then, going into a diode, then out as Light Green to the ECU "on")
The way the harness is setup, many folks cut this wire as it's junction is way up near the underhood fusebox. It's alright, it kinda needs to be cut and spliced longer to make the harness work elegantly anyhow.
A/C wires, and state ID can be cut out. Neutral/park/and auto/manual swithes depends on the swap. What year trans are you using? does it have a neutral switch in it?
i have 2 wires from sensors, 1 on the block the other 1 on the water cross over. which i have not attached, im guessing they need to be tapped in or are they just for gauges? they are the single pronged sensors see pic below
Those are for temp gauge and oil pressure dummy light. They will connect to the Yellow/green and Yellow/Black wires of you're cars original engine harness respectively. Install a 270 Ohm resitor between the Temp wire and ground to correct the gauge reading from EA to EJ.
IAC issues.
Yellow = 12v+ center pin
white = close (ECU grounds to close)
Black = open (ECU grounds to open)
ok fuel pump relay...thick yellow is constant power thick black? does this run to the pump?
green comes form ecu and at a guess thin yellow wire needs switched power, not constant?
The thick yellows are constant, the thin yellow is Ig. Switched.......supplys the relay, the Igniter, and coil....then on the diode, comes out Light green for ECU and fuel pump "on"
Black is ground.
ok i did think oil and water sensors, thanks for confirming.
it is all powered correctly now and fuel pump relay is ecu controlled. spark at all plugs
ok now for the extra wires from the ecu,
- aircon wires i will remove
- fan control will be removed
- state id will be removed
- atmo sensor?
- neutral switch?
- park switch?
It is a auto ecu and i will be running a ej d/r 3.9 5 speed
You will want to use the fan control wire to trigger a relay (ground side) of a relay. More reliable than the switch in radiator.
Atmosensor is built into ECU....shouldn't have any wires.
Cut the Auto/Manual wire to signal manual.
Hook the neutral switch wire to the neutral switch on the trans. (grounds when in neutral) ignore park wire(cut)
Although, if the IG. relay is gone, may need to check that all item supposed to be powered actually get power when you wire it up. the big yellow wire (Batt+)in particular feeds power to lots of stuff before it goes to the relay, so things like the Transistor, IAC, Vent solenoid, etc... may not be in the loop still.
Well I found out values for the ej and ea gauges
at 122*F there is 187.6 ohms at 248*F there is 19 ohms on the EJ gauge on the EA gauge it reads as follows
158*F is 72 ohms
248*F is 16.1 ohms
The supplier for the oil line and fittings is Paragon Performance in Lake Arrowhead, CA.
http://www.paragonperformance.com/
I got them to fax me the invoice but all it had are descriptions, no part numbers, anyway, here goes:
8" -04 female st. to st. Teflon hose assembly.............$13.10
#4 st. male, AN flare to 10mm x 1.0.......................$11.15
-04 Alum. Straight AN to 1/8" NPT Adapter.................$2.10
Alum. pipe bushing, 3/8"/1/8".............................$9.10
Alum. pipe coupler, 3/8"..................................$9.65
Note that 8" of hose was barely enough to get the sender positioned where I have it. Depending on where you want to mount it you may want to order a longer hose.
Their entire line of adapters is on the website, it just takes some poking around to find them all. They also make custom stainless lines, in whatever length and with whatever connectors you want, I had some made for my three-wheeler, they're very nice and not too pricey either. I'm pretty sure you can get DOT approved lines as well.
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ECU
Manifold sub-harness connectors
Ignitor
Cam sensor
Crank sensor
Knock sensor
O2 sensor
MAF sensor
Alternator connections
Grounds (one's used by remaining components)
FP Relay
Ignition Relay
FP/Ignition power
ECU power
ECU backup power
Power supply diode pack
CEL ground wire
VSS signal wire
Neutral switch wire
Start signal wire
Tach signal wire
I might be missing some..... as I said that's from memory.
GD
Uhh....no codes if you do it right. I've used 3 Auto ECU's now.
NO CODES.
You have to do one of two things:
1) cut the AT/MT discrimination wire, and wire up the ECU correctly for a MT, with Nuetral switch (since you're RX is already MPFI, your trans should have the switch)
2) If you don't have a neutral switch, leave the AT/MT pin grounded, so it thinks it's in an Auto. Then the trick is you have to tell it it's in "P" all the time so ground the "P" pin.
Interesting.... So it won't throw codes if it sees the vss signal and the park signal at the same time? That would seem like a large oversight on the part of the software engineers. If I wrote that software I would be calling the park switch bad at that point. I guess if it works without codes that's great. Im guessing that probably wouldn't fly on the OBD-II's. I would never have thought to try that - thanks for the info.
GD
There is an AT/MT identification wire on the '96-'99 ECUs, but you have to add a pin there for it to work.
It's absolutely possible to use -'99 EJ ECUs that came from a car with an auto with a manual without any CELs
Went to NAPA today and got fuel line, shorty belt for alternator (thanks again for the part number) and found the perfect hose for the upper radiator. It has the ej inside diameter on one side and the ea diameter on the other side. It is napa heater hose number 7564. I have a 4/3 lift and i shaved about 1" off the ea side and it fits perfectly
Another trip to NAPA and found radiator hose number 8987. This worked perfect for my lower radiator hose. I trimmed about 1.75" off the radiator side and it was perfect. Now I need some new clamps for my heater core hoses. The stock EA hoses seem like they will be fine for now. If I can get the coolant filled I think I can plug everything in and see if it works. I got my fuel pump hooked up yesterday. I hope I didn't screw up the harness.
EJ22T auto trans is 95% identical. However there are a few internal differences. (# of plates in clutch packs, higher stall TC, stronger springs in the accumulator pistons)
As long as everything trans wise is matched, it will work fine. i.e. Turbo trans, turbo flexplate and TC, and turbo TCU. If you are keeping the NA trans in your car, just use the old NA TCU, flexplate and TC too.
As for engine wiring. There is one more pin used in the ECU connector. (Boost pressure solenoid) Also.....Crank and Cam sensor pin location is switched on the Turbo ECU.
You could run the turbo ECU and engine off of the stock harness. A few pins switched, and a few new wires run.
Otheriwise, get the whole harness from the Turbo car and strip it down.
OBD I EJ22? just switch the cam and crank angle wires, add the wires for wastegate control and pressure sensor, reroute the temp sensor wiring (it's on the other side of the coolant bridge), and you're done. don't need a whole merge.
Yes - as Numchux says they are very simple. Obviously you will also need the EJ22T ECU as well as the changes he outlined. The turbo only added the boost control stuff and changed a few wireing pins.
Also I will mention that the few wires which need to be swapped can be done at the ECU pins with much less drama than out at the actual sensors since many of those wires are sheilded, etc.
GD
I went through hell with charging on my last swap. In the end, I did not hook up the EA wiring at all. I ran the B/W wire from the EJ harness to the wire for the charge light. And the Yellow wire from the alt get's switched volts from a fused source.
*note about yellow wire: that wire has a diode on it. after the diode, it is green wire, two of them. One goes to the ECU, and the other goes to the IG. relay trigger. If you cut out the diode, and supply power straigh to the green wires, the car will still run, but the ALT won't get it's signal volts.
So you need to make the connection to that wire before the diode.