Wiring woes
 

Alright so before I start I hate wiring. I have a Micrpotech LT8s that I purchased from this very forum. It has a nice wiring harness made for a S4. The harness is pretty straight forward except a few things. This is what I have connected so far, the two coils, CAS, TPS, and all the injectors. What I know needs to be connected is the alternator, power to the fuel pump and as of right now that is it but there is like 4 wires that are cut that need to go somewhere and I ahve no idea where but I know two of them have to go to the alternator. I took pics of all the wires and I am going to post them in a little bit. But fo now, one wire is red and has a fuse in it, it is in the main wiring loom (same as the injectors). Then there is another one right next to the TPS that only has two prongs that go into it like a house plug. Then next to the coils there is a plug that is 4 prongs that go into it with wiress blue, yellow with blue stripe, and then the next two are cut and they are Yellow, than blue w/ yellowstripe. What are the things that need to be connected in order for the microtech to run properly.

Here are the pics

Here are the pics...
1) The whole harness
2)The Injector clips... There are 5...
3)No idea what this connects to...
4)No idea what this connects to
5)The one on the bottom conects to a coil but I ahve no idea what the one on the right connects to two wires are cut and the top I have no idea what it connects to...
6)Closer pic of the one on the right from the pic above

7)The one on the left is TPS but then the other I do not know...
8)I have no idea what where these go. One red wire that has a fuse on the same line. A Bosch thing where there are 4 wires connected. And a red wire that is cut that I do not know where it goes...

Any help identifying what wires are what would be great... If u live in Tri Cities WA or close by come help me. LOL

That wiring loom looks dodgy as. I wouldnt even use it.
But if you had to.
The first picture in your second post. That is TPS and Air temp sensor.
The second picture in your second post looks like fuel pump relay and the other red wire on it with the fuse powers the relay and the microtech.
4th picture first post The black wire looks like an earth for the computer.
3rd picture first post looks like 4 injector plugs and the green plug goes the water temp sensor.

the 5th and 6th picture look like they are for the coil packs. They look very similar to the plugs that are on the coil packs.

BUt to be honest. I reckon you should throw that loom away. Order a new one from microtech. And do it properly. Who ever did that wiring really needs to be shot.

Wow thanks.... I was told this harness came from a running TII that is why I would be using it... The six pic is definately not the coil plug.... I already have both coil plugs figured out... do u happen to know where the alternator connects to? It has to connect somewhere.... But thanks for the help wiht the other wires..

Ok alternator wires.

You said its a s4. So their is a two pin plug behind the alternator. And on the inside of the car their will be another two pin plug near the factory ecu. Basically those wires on the inside need to go to the alternator.

Im not sure if your loom is doing that or not.

Your loom will work. But im just saying that it looks very dodgy and probably the reason he sold it is cause he was having problems.

I'm pming you right now...

Let us know when the new pics of them. If you can peel the tape back and show me some colours. May be i can help you some more.

I retaped the harness but I will peel back the tape and see the colors. But as of now I have learned where the connetor on pic 5 on the right side connects, it connects to the battery harness as seen in the first pic I just posted and then the second pic is of the trailing connector, Only one side is connected and then the other is not as seen in pic 2. I'm lost as to why. I remember when I peeled back the harness yesterday that there were three wires that went to the igniton, 2 of which went to the connector that went to the battery harness in pic 1 and the other connected to the trailing (one wire only). The one connected to the leading was a pink wire from the min loom, the injectors loom... when I peeled back the tape yesterday I found labels that I'm pretty srue said igniton. It was on the harness that goes to the igniton. So as of now I figured out where all the wires go except for the one in pic 2 in this post which is half of the trailing igniton wire...

This is what i was trying to tell you in pm. What you have said above is totally wrong.

Pink is unrelated to coil packs.
Pink has to go 12v ignition, so ignition barrel etc.
It can go to coil packs but only if they are sourcing a healthy 12v signal from elsewere.
Next.

Their should be two trigger wires going to the trailing coil pack, and one trigger wire going to the leading coil pack.
So from the microtech. Their is a grey/blue wire that will go to the leading coil packs.

And on the trailing their are two wires which are grey/red and grey/black.

These are the - triggers


FOR THE LEADING COIL PACK
Their is a pink wire on the IGNITOR side that needs to connect to the grey/blue wire.
Their is a tan wire that goes to 12v ignition and can be connected to the factory coilpack 12v ignition.

FOR THE TRAILING COIL PACK
The pink wire on the IGNITOR side goes to grey/red and the white wire goes to grey/black.
THEIR are 2 wires on the trailing ignitor and they are both tan. They both need to be connected to 12v ignition and the factory ignition feed is fine.

Hope this makes things clearer for the ignition side of things.

wow this is getting printed right now... LOL I'll update tomorrow...

Let us know how you go.

Ok I am still kinda lost to why there is this loose wire in picture 2 of the last post with pics, does it go to a 12v ignition? That is the only wire that is unaccounted for everything else checks out... Everything else seems to be wired correctly. I am currently following the bosch relay directions you pmed me...

Trace the wire back to the microtech loom. And tell me what colour it is on the microtech loom.
If it dosnt go back to the microtech loom. Get rid of it. And what ever isnt wired up. Ill tell you how to wire it up.

I think I figured it out. My friend told me it goes to the tach probably. I haven't been working on the car, waiting to get another microtech hand controller. I lost the one I had.... There goes a hundred sumthing dollars, again...

your mate saying it probably goes to a tach is pretty un founded. you need to be 100% sure.
their is no need to guess.
just tell me what colour it is on the microtech loom and ill tell you what its for.

hey there that one just above on the right looks like wat i have done with myn! i dont use the standard coil packs and iam using the ignition from them to power the coils during starting :D but thats only wat i have done not sayen thats wat it is but just a thort :)....

SO the wires from the alternater just connect straight to the plug next to the "factory ecu area"??? and also where are the dam buzzers on the s4 rx7 cause now ive put the microtech iin theres a constant buzzer going off wen i turn the IGN on now dont wat it means or if its ment to do that.....:wallbash:

Its the coolant sensor.
Its a brown wire behind the radiator that needs to be either connected to the sensor or grounded somewere.

Also the alternator plug on an aussie spec fc is right nexto the factory ecu. clear as daylight 2 pin plug.

If it is like Ro20ry says, what would I have to do then to rewire it to run the stock coils? RX72C, the wire is from the trailing coil plug. Not on the microtech loom. I just wired a honda harness this weekend from scratch, the harness was all spliced up and messed up. With no diagram I converted some stuff to from OBD1 to OBD2 as well and damn I stayed up all night doing it. Now the honda runs and this microtech harness looks so much simpler dammit, this should be cake, I just don't wanna take it apart and end up messing it up...

you cant mess up a microtech loom.
their too easy.
take apart what you need to.

their is a grey wire on the trailing coil pack that isnt used. it dosnt get connected to anything is this the wire your talking about?

rx72c is rite EVERY one wires the computers up diffrent we both could sit here and tell you diffrent ways of hooking them up but just think you would have saved so much time by just peeling back the eleco tape and split tubing if its got it on the only wire youre not to sure about and post up the colour of wires than i or rx2c can tell you straight it away than you can the bloody thing done hahaha lol

:hahaha:

Ok I got it. there is one wire from the loom connecting to the trailing plug. Then the wire that is loose (the one I am trying to figure out) is a wire coming from a splitter from the trailing plug. It was spliced in... So I'm ok, I'm sure then... It doesn't need to be connected to anything... Whoo hoo... I love this forum!!!

thank you fro all the help!!!

make sure its not for your other coil b4 you go cutting it off.... than you will have to rejoin it than you start getting messy that way !!!! keep ya joins a minimum looks alot neater that way :D any ways great that we could help you out :icon_tup:

It is not for my other coil. The other coil is already connected and all. I didn't cut it off. I folded it and wrapped the end in electrical tape, just in case for umm well you never know.... LOL But I finished everything today. I got the wire for my fuel pump connected and I for the ground connected. I also wrapped all the wires in zip tie to make it look neater. All I need in the car is a battery and connect the positive. LOL Ohh and my hand controller is on the way... This week my car is gonna startup... Whoo hoo wish me luck

good luck

Hand controller didn't arrive yet... LOL startup is this weekend...

GOOD luck hope it all goes well for you champ :D

So to power the microtech does the car have to be on or just on Accessory cuz I just went to crank my car and there are no lights on the ECU that are turned on and the hand controller has no power... is there another way for me to get power directly to my ECU outside the car so I can put a tune on it... I am also thinking of re-wiring this damn harness... Can someone give me a guide to tell me what color goes to what plug from the microtech loom... I am going to take off the elec tape and look at all the connections...

So the relay connectors seem to be correctly wired... The only one that seems weird is the one that is supposed to go to the power to the battery. The wire is connected to pin 87 but I trced it back to the loom and it is also connected to a red wire, blue with red stripe wire and white wire... Is this right?

i told you to rip apart that harness and redo it. the guy who did it originally is dodgy as.

To power up the microtech their are 3 wires that need to be connected.

RED, PINK and BROWN(their are a few brown wires, they all need to be connected to the one black wire that goes to earth).

RED is CONSTANT 12V
PINK is 12V IGNITION
BROWN(BLACK) is EARTH.

As for your relay.

blue/red is an input. so is the white wire.
so dont know what the hell is going on their.
thats not right.

Is there like a guide can follow to redo this harness. I'm not talking like wiring diagram cuz I don't get how to read wire diagrams, I'm talking about like write up cuz everything seems to be color coded afterall... So if there is a guide that tell me where each wire goes that would be great...

tonight i will do a small write up on the installation.

Yes, there BADLY needs to be a How-to for the microtech. My friend had a bunch of trouble going by the schematic that came with the microtech. And I am thinking of getting one as well. A write up with pics of which wires go where would be grand.

Alright here is where I am right now... I unwrapped all the elec tape and looked at all the connections. Based on what was already written in this thread I have everything connected but 7 wires... They are all from the same loom as the injector plugs, they are as follows:

white
purple
black with red stripe
blue
grey
black (not the one that was used with the brown wires for ground)

Also my water temp is not wired in
My TPS is not wired in

How do I wire them in?

My injector plugs were wired like this to each injector:
red and yellow w/black stripe
red and orange w/black stripe
red and orange
red and yellow

Are these correct? If so which ones go to the primaries and which to the secondaries?
what wires go to what

Ohh and the CAS wiring would be great cuz I dont' know if that is wired correctly...

thanks in advance

ok white wire is your Aux_FAN out put wire. This connects via a relay to power your electric fan(if you have one) otherwise leave it disconnected.

Purple is your Water temp sensor wire and it is non polar, can go on any pin on the water temp sensor, this is usually bundled with a brown wire(earth) which you should have a few of, on a unfucked with microtech loom the brown wire coming from the microtech is split into a few brown wires and one black wire.

BLUE and GREY are both for the TPS and are bundled with a brown wire(earth).
im pretty sure you said you have a s4 so this is how the tps connects.(looking at tps).

blue=orange
grey=green/red
brown=black/red


Black with red stripe is your narrow band 02 sensor input which dosnt need to be connected.

Black wire is your air temp sensor wire, this is non polar so can go on either pin of the air temp sensor and is usually bundled with a brown earth wire(as explained for the water temp sensor).


THe bundling of wires for the injectors is correct. all injectors require 12v and the computer earths them via the different coloured wires. Important thing to note about injectors is that they are non polar but all injectors must be wired in the exact same fashion. So if you have one injector with PIN A as + and PIN B as- then all injectors must follow this pattern

now

red and yellow w/black stripe = Primary Rear Rotor
red and orange w/black stripe = Secondary Rear Rotor
red and orange = Secondary Front Rotor
red and yellow = Primary Front rotor.

hope that answers all questions. anymore let me know.

ur a lifesaver!!!

so the TPS water temp and Air temp all have to have one brown wire connected to them right?

Ohh yeah one wire unaccounted for.

Blue with red stripe

yes water temp, air temp, tps all share a brown wire(earth).


blue with red stripe is an input. just ignore it.

Ohh man I don't know aht is wrong I followed everything down to a "t" and I'm not getting power... I don't know y? Could this microtech be bad? Ohh god I hope not, is there a way for me to find out? I am getting desperate here...

Alright startling revelation, the car Cranks, I know the starter works. LOL anyways I connected the positive to 87a on the relay and the fuel pump turned on, so at least I know it works... But no lights are coming on my microtech. I wired wrong I know... the 12v thing is what I am thinking... The pink wire, But the pink wire is connected to the relay on pin 86 and the other is connected bridged to my coils as you said... Is this right? But I have nothing wired to my ignition switch, there is nothing to switch on the power. How do I fix this? I am a complete failure. LOL I can't believe I missed this....

ok.
your coil pack wires must not have 12v.
check your engine fuse.
if all fails and you cant get power to your coil packs your going to have to get it directly from your ignition barrel.

As for your fuel pump relay it shouldnt be connected to 87a.

I know I had the positive on 87 not 87a, I just checked to see if my pump was working... I just put a new main fuse 80a and new other fuses as well. Which one do I need to check specifically? So the pink wire splits into two, one is connected to pin 86 on the relay and the other is connected to the plugs that go to my coils... My problem is that when I switch on the car, the fuel pump doesn't come on and I'm getting no power to my microtech. So something has to be connected wrong on my relay... I think I did screw up cuz I was looking at this...

My coil packs have to be sourcing a healthy 12v from elsewhere so, I have not messed with the factory wiring on the battery harness. Where are the tan wires? Pink has to go to go to 12 ignition, so ignition barrel.. How do I do this? But I already have both pink wires connected as in the instructions... I'm confused again... I almost got this it is this one thing I screwed up on I'm sure of it...

the relay isnt going to be the reason your computer isnt switching on and your fuel pump is NOT going to switch on if your computer dosnt switch on.
So put the power wire back to 87 and lets get the computer to work.


So their are 3 things that the computer requires to work.

Power
IGNITION TRIGGER
EARTH.

CHECK that their is 12v all the time on the RED wire
Check that their is 12v on ignition at the pink wire
Check using a continuity test on a multimeter that you have an earth on the brown wire.

DO this all from the microtech plug that goes into the microtech itself.

One of those is going to be not working, then we can say whats not letting your computer switch on.

ignition trigger is my problem I think. Where does my pink wire need to be connected to? From the loom it splits into two and then one goes to the relay and the other should go where exactly?

It has to an ignition source.
SO if your so sure that your coil packs are getting a healthy 12v on ignition then your computer will get it.
Dont make any assumptions or will be going round in circles for ever.
Conduct the tests above.
It will make us know what were doing with no doubt.
Also go to your coil packs and check that is actually 12v their on ignition.

Alright I'll update tomorrow...