Steelo

Hey mate,

Thanks heaps for the replies and info! I have been near death with the man flu lately.....hence why I haven't replied lol.

In reply to your last post, I don't think that particular plug exists on the smallport loom. It has a fully fledged DIAG port on the loom. Which I will be keeping.

Here's the relay I have put into the factory fuse box, it had the provision for it but being carbed from factory it didn't have the relay itself in there. I've checked continuity between the pins to see where it ends up underneath. Pin 3 is all about the place.....ground? pin 1 is right where the thick white cable and b/r go in.....must be the power feed. Pin 2 and 4 are over by themselves where there was a blanking off type plug underneath, I pulled it off and hey there's a bunch of terminals under there.

From what I understand pin 2 will go off and feed my COR/fuel pump and ECU.

pin 4 will come from the 15A EFI fuse in the fuse box

pin 1 will be from the battery.

Since pin 3 is found in multiple areas, is this the ground?

On 30/05/2019 at 13:47, AE25 said:

If using ae85 dash wiring... do you have a wiring diagram for it?  i had a bit of a google but only found ae86/4age stuffs. ie original toyota workshop manual to download and engine manuals https://www.hachiroku.net/servman which covers the efi wiring but couldnt see reference to the 3au emissions ecu specifically .   its reasonably easy to trace wiring once you've got a matching diagram to follow But id be wary of splicing into power to an ecu that is half disconnected from the engine without knowing where the wiring comes from?! (Emissions ecu).

Generally a fat white wire going into a fuse box is the 12v+ power feed and is only fused at the battery which needs to be stepped down in fuse size to be safe. 

So yeah can use the Stop fuse for constant power.  I dont see any reason not to use that plug-in fuse splitter thingee.  even better if it uses a 2nd fuse to power the splice.  chuck a 15amp fuse in for ecu BATT pin and job done.

Im thinking the 30A ign fuse is too grunty for ecu power source.

Do you plan to setup a "main relay" as per ae86 wiring? then basically wire it as it would factory? There's a few things that get power from it in the 86 wiring and its good to share the load instead of running it all through the ignition switch.

I havent had a geez at ae92 wiring diagram but will need to identify if coil and injectors are powered by a relay or via ignition switch.  86 diagrams seem to show both coming from the switch but i recall ae101 had a bunch of stuff on one and a bunch on the other.  had black/orange and black/red wiring to differentiate between the two power sources in ecu loom. One (assumimg switch) came out of the fwd loom around the front end of injectors whereas relay power came out at the fwd engine bay fuse box.

Also, the +B and +B1 pins on the ecu are joined together on the circuit board so only need to supply one of them with switched power from either a main relay or ignition switch via 15A fuse.

Hey mate, thanks for spending the time to type up that reply.

I have this for the instrument cluster, but nothing really for the dash..

Ok, I think I have the BATT sorted for the ECU.

I think the plan for running the fuel pump through the COR and +b and +b1 is to add a "EFI Main" relay into the factory ae85 fuse box...

I have the relay plugged in and tried to find continuity between pins 1-4 on the relay and everything underneath..pin 1 seems to lead to a pin beside the thick white wire coming from the battery. Pin 2 (will go to ECU/COR) and 4 go to a unused terminals under the fusebox (I should be able to put a connector right onto the terminals) and pin 3 shows up on a few pins.....If this is the ground pin does that make sense?

Thanks.

New post in project thread!

Hey fellas,

I've just had another poke around the wiring on the levin......a few things I saw left me with a few questions.

Have I not been able to see the forest for the trees?

I have read over and over that people use the stop circuit to provide constant power to the ECU (BATT)

I noticed there was a fuse labelled as "ECU - IG"...I tested this and it provides 12v on ignition. I don't know what ECU is it currently providing power for, maybe the emissions control? There is a B/Y wire going to that that has 12v on ignition.

Does it seem logical that I can use a fuse tap from the "STOP" fuse to provide constant power to the 4age ECU?

Can I use the same fuse tap method to provide switched power to the ECU from the "ECU-IG" fuse?

Am I an idiot? Or could this work and eliminate all the wire tracing I was in the middle of doing?

16 hours ago, Ashkellybarr said:

White will come straight from the battery so be careful where you tap in as it might not be fused

If it’s like my 3A there should be some weird emissions box thing above the glove box, have a look at using the feeds and 0v to that. That way your using factory loom and fuse so will keep it tidy and the ecu fuse in the fuse box instead of a random inline one witch can be hard to trace.

black with yellow strip should be starting circuit and go to your starter relay and solenoid?? There should be another black (with maybe a red stripe?) that will feed other accessories witch might be better for switch feed

Hey mate, thanks for the reply!

I had similar thoughts about using the wires going to the emissions control box in the passenger kick panel.

Is this the one you are talking about?

As I say the only wire that had power to that was the black yellow upon ignition.

Hey team,

I was doing a bit of homework today on the 85, I hooked up a battery so I could see what had power constantly and what had power with the key in the ON position.

I'm just wanting to see what I can use to power the 4age ecu with. Looking in the passenger kick panel here.

This thicker white wire has 12v as soon as the battery is hooked up - would this be suitable to tap into to use as constant power for the ECU?

Also to the left of this wire, in another plug, there is a white / red stripe wire that has the same constant 12v. Could this be used?

This next wire only has 12v when the key is in the ON position. The green plug goes into the old emissions control for the old engine and is now surplus to requirements. Can I use this black / yellow wire for 12v switched power for the ECU?

Thanks guys - I know this the most boring part of any conversion lol

Looking forward to more progress pics of the 86, looking really nice so far mate!

1 hour ago, AE25 said:

Hmm i can help as ive done a few.  Are you in the south island?

To help us help you,  tell us what exactly you want running on this thing.  Pretty much all the engine loom wiring has a purpose unless it was originally an auto.

Ie: are you going to run the diagnostics plug?  Are you going to use a circuit open relay? Do you want power running off the correct relays as intended by toyota or are you adding in some?  do you want to extend the ecu loom or add in a firewall junction plug?  Do you want the dash to flash error codes?  Are you changing alternators - the type may determine how to wire it. 

Circuit open relay are piss easy to source from a wrecker.  make sure it shows a diagram on the side of the circuit inside and see that the pins are easily identified (labeled 30, 86, 87 etc).  and get one that has a plug and some wiring off it so you can splice into it.

Ideally you'd source ae86 full car loom and swap the lot but yeah, not easy. 

Download and print out the matching pinout for your ecu (post it here too so we know what you're referring to).  do the same for the ae92 ecu loom if possible.  Could work it out from the pinout, but without knowing how it works it'll confuse ya.  getting hold of a toyota yellow book workshop manual for the ae9 would be great, so you can understand the electrical systems.

The alt wiring size should be fine unless youre running a big sound system or electric power steer, then the current draw increases heaps and youd want a bigger batt and alt anyway.  the extra draw from a fuel pump and injectors arent huge.  You'll be splicing out the alt wiring anyway as its on the other side of the engine. Also you're going from an external regulator to an internal.  you can use the existing wiring but will need to change the lengths to suit the new position.  could always upgrade the big white alt wire to the B terminal if you find the ae9 wire is bigger than the ae85.  its in the ae9 engine loom anyways so youll prob end up using whats there and make it connect to the existing 85 alt loom or run it direct to battery, where ever that may be.  If the new alt has a sense wire, then you may find it needs to be added in.  external regs dont usually have it.  its one of the 3 wires in the alt 3pin plug (not the charge lamp or ig wires) ant it also connects to the battery. Yeah you could just connect it to the big B terminal but youll get a lower charge voltage under load.

i havent personally done ae92 loom yet, but if its anything like ae101/111 youll have extra stuff to deal with like a starter relay, which if wired correctly also connects to the STA pin of the ecu.

The diagnostic plug has a few extra wirings in it but i cant imagine youd ever notice a weight difference by removing it.  you can check things like if the oxy sensor is faulty without having to tap into a wire somewhere or the back of the ecu.. its right there on the firewall etc.

Hey mate, thanks for the reply!

I am in Dunedin.

Ideally I would like everything to run as intended....eventually....but want to nail the core things required to make it run first.....things like check engine light etc I can figure out later.

The loom has the diag plug on it so I was going to keep it there.

Relay wise, I would like to use the original fuse box if possible. If I need more relays then I am happy to add them in neatly somewhere.

I am happy to extend the smallport loom so it can route inside the cabin nicely.

For the fuel system, I will be sourcing a toyota COR.

I am using the standard AE92 alternator. I have a pretty basic understanding of the charging system and what is required there, the wires will definitely need extending to get where they need to go. I have separated this wiring out of the loom for the time being as it is somewhat separate anyway.

These are the main sources for info I have been using:

http://club4ag.com/faq_and_tech_pages/ECU Japan AE92 90-91.htm

http://www.rollaclub.com/wiki/index.php?title=Tech:Engine/A_Series/Wiring_Diagrams

thanks.

Hey mate thanks for the reply!

I have read that 4 wires to the 12pin plug are enough to get it to run.....these being(?):

Pin 1 - B1

Pin 2 - BATT

Pin 4 - COR

Pin 7 - B

I have a 12pin plug to fit the ECU which I can use for the above pins. Can you remember where you tapped into for pin 1,2 and 7? I can put up some pics I took today of the kickpanel areas

At this stage I don't have the circuit opening relay for the fuel pump. I hope to get one pretty soon - can you buy an equivalent relay from the likes of Jaycar?

So the stock AE85 alt wiring from the 3au can support the alt from the 4age?

Thanks!

I thought I would update here to so people could see where I am up to.

As said in the discussion, I am currently stripping back the wiring for the Engine and removing wire that aren't needed such as ones that went to the body of the ae92 and removing them from the loom.

I have separated the alternator wiring from the engine loom at this point and will integrate it back in at a later point once I look at the car and see what factory wiring I can retain.

Still unsure of a few things on the loom at the ae92 fusebox end of the loom. I hope this will make sense once I look at the car......it's not at my address at this point.

Please feel free to comment and post pics of your wiring on your ae85 conversions - I would like to see them!

Also I would like to see pics of what people have done for a throttle cable mount onto the side of the intake manifold.

Cheers.

Hey folks,

I got the bug again and started attacking the wiring....I began figuring it out ages ago and then stopped as my old man said he knew a guy that could do it.....but never did.

I have learnt a shit load by studying wiring diagrams and looking around forums etc over the last week.

I am currently taking all the old tape and shit off the loom so I can liberate some wires that aren't needed. This has added hugely to the learning process, being able to see where everything goes and being able to trace the wires everywhere is making all the difference.

I understand the smallport loom is short and needs to be extended - this is what I am looking at doing next as I want to have some freedom with mounting the ecu inside the car.

Looking forward to making more progress.

Can anyone advise on the following?

+ locating wires in the cabin for BATT, B1 and +B1 for the ECU.........if anyone can advise on the best source for these would be great!

+ wires in the kick panel area that have 12v on ignition that can be used for powering coil/injectors or whatever.

+any tips or anything unexpected that people have discovered while doing this wiring?

Thanks!

Hey bro, you could try Abrasive Concepts @ 31 Macandrew Road. It's right beside Aotea Electrical.

I can't vouch for their work or say if they do cashies as I haven't had any work done by them I just got a quote to clean up some wheels.

Could be a good place to start.

I might be making a mountain of a mole hill but its unfamiliar territory for me haha. 

Yeah there are all the ECU pin outs on club4ag. Do you know if the dash wiring on the ae85 is the same colour as ae86? It seems to be hard finding ae85 specific wiring diagrams for wiring the body plug on the ECU.

Quote

1990 s13.

I actually have most of the wiring done. Its just been sitting for about 10 years so like you I kind of need to spend the time to get my head around it again.

I do remember laying the loom on top the motor and windscreen of mine and finding plugs that fit and seemed in the right place, It got easier the further along I got.

What car is your loom from?

The loom is from an AE92 levin, same car that the engine is from. I had it sent down from a wreckers in CHCH back when I started the conversion. It's more the feeding the engine and ECU power and signal from everything it needs which I am uncertain about. I'll just do it step by step and hopefully I'll have some help along the way.

Hey thanks man,

Yeah I need some luck by the looks of it, I have the wiring loom for the engine on the floor behind me and I'm looking over it now.

What sort of silvia do you have? I use to have a 1996 180sx type x many years ago...ahh I miss that car.

Who knows, maybe I'll get my head around it and figure it out. I'll help you if I can but at the moment I would be no use lol.

Hi team, 

I'll post up the build thread and info tonight when I get home from work. In the mean time there a couple of pics in the introduce yourself thread. 

I wanted to start this discussion off now to ask for some guidance around wiring of the car. 

I have a smallport 4age sitting in the car ready to be wired up. I have a uncut engine loom for the engine. 

Where do people recommend I start? I am going to get started on it this Saturday, I need to have a good look at everything and familiarise myself with it again. 

No doubt I'll have more questions and some pics to follow on from working on it this Saturday. 

Thanks in advance for any info. 

Build thread here :

Name (first is sweet): Adam

Location: Dunedin

Cars you own: 2012 Subaru WRX, 1985 Toyota Levin SE and Yamaha Mt-07

Mods to them (can be brief or detailed):  The WRX is standard. The AE85 is in the process (and has been for what feels like forever) of a smallport 4age conversion, along with all the usual supporting mods.

How you found out about oldschool: I knew about it ever since I was active on Toyspeed about a decade ago lol.

Anything else you want to add: I have just found the motivation to complete my AE85 project, the main hurdle for me is the wiring which is where I left it a few years ago. I've done a bit of research recently and I think I can handle it. I may put a thread up about the car asking for help if I get stuck!