Microtech Wiring woes
05-01-08, 05:50 PM
#1
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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.
05-02-08, 03:37 PM
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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
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
05-02-08, 03:44 PM
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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
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
05-02-08, 06:08 PM
#5
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.
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.
05-04-08, 11:23 AM
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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..
05-04-08, 05:06 PM
#7
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.
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.
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05-05-08, 11:04 AM
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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...
05-05-08, 07:06 PM
#11
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.
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.
05-06-08, 02:08 PM
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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...
05-20-08, 10:26 AM
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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...
05-20-08, 07:55 PM
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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 
but thats only wat i have done not sayen thats wat it is but just a thort 
....
but thats only wat i have done not sayen thats wat it is but just a thort ....
05-21-08, 12:49 AM
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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.
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.
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.....
05-22-08, 07:32 PM
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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...
Last edited by asiandude15; 05-22-08 at 07:39 PM.
05-23-08, 04:28 AM
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05-23-08, 04:36 PM
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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!!!