Supp guys..... Anyone have a single turbo engine harness diagram???? Any help would be much appreciated. Just want to clean things up a bit.

 

hrm not sellin an fd are ya??

 

It's not as easy at it sounds. you have to open the loom and track the wires around and remove whatever you've got removed from the car. Some wires are t-ed off one another.

Here's a stock OEM mapping of the engine harness.

 

 

Thanks grimple1, you the man!!!!

 

here's a quote from Goodfella's build thread:

There is a ground that daisy chains through the harness so once you cut all the sequential connectors you need to solder the ground back to the ISC connector in order for it to work properly

 

Is this the blue or gray connector? I just did this and noticed that both connectors have two grounds going to them.

 

yes that ground is brown with black stipe and silver dots if im not mistaken

 

Just cracked open my harness. There is no brown wire with black stripe going to any of the solenoids. The only information I have found about this was from another rewiring thread and all it said was.

"If you cut off the solenoid connectors the idle air control will not function. It shares a power with the gray solenoid connector."

So.... I grounded the cable as instructed from the gray solenoid. My question is, can I cut off all my connectors in the rats nest and not have to worry about any problems?

 

here are some pictures from others single turbo harness' that i've collected. It should give you a visual of what's going on. Remember they might be different than yours due to what's been removed on yours vs theirs. Some people remove the IAC and some don't.

 

I have no idea. I'm still saving for a new harness so I can simplify it. The one on my car wouldn't live through the conversion. it's pretty brittle.

Just been collecting tidbits here and there for when I have a chance to do it myself.

 

Thanks for the info. I currently have 3 grounds going nowhere and it's just kind of weird.

 

Can anyone bring some clarity to this? Removing the wires is going to be simple, I just need some clarification about the ISC in terms of what it shares power with, or what needs to be done to ensure its working properly after everything else is removed.

 

We need Rich in here to clear up this stuff =D Should the ground wire be depined and then repinned into the ISC plug? What wires can for sure be taken out?

 

It seems the only think that needs to be done in order for the ISC to work properly is to make sure the ground for the ISC plug is reconnected in conjunction with the ECU, which is simply why just 'cutting' out the rats nest doesn't work (unless you've deleted your ISC)

I'm going to be working on my harness this afternoon, Ill be sure to take some good pics so everyone knows exactly what's being talked about.

 

if you plan to control boost with a PFC, do NOT cut the wastegate solenoid plug off

 

Yea I had planned on keeping those just in case I decide to go that route. Will I need to remove any of this ABS stuff in this back corner to pull the harness through the firewall?

 

ugh soo confusing, what exactly needs to happen with that gray wire, cuz i dont want 8 plugs just sitting there frmo the rats nest that arent going to be connected to anything ever again. etc for w/e other plugs arent needed anymore.. anyone please?

 

Just remove the shield from underneath the ABS. I just loosen the most forward and rear bolt on the ABS so It'll become real loose. Then remove the two aluminum colored bolts that are close together in the center. Then lift the ABS up some and and work out the shield.

 

So what should I do with the ground from the rat's nest that daisy chains throughout all the rats nest? should I just slice it to the ISC wires? or maybe take out the pin and pin it into the ISC plug?

 

Ok I unwrapped the harness to find where one of the missing grounds goes. Problem is, I cant remember what plug it went to (sorry) but I'll try to explain as best as I can.

On two of the connectors (one of them is the gray connector) there are two grounds going into the plug. These plugs have two grounds because the ground goes back into the harness and supplies a ground for another connection. The ground for the gray connector that doubles back into the harness does go the idle air control valve.

Now, my car is running non sequential turbos, a PFC, no emissions, and a aftermarket boost controller. Consequently when I traced the other ground back into the harness (not the gray connector) it lead to a plug that I had already cut off. So if your setup is the same as mine then the only ground you really need to worry about is that ground that went to the gray connector.

Even though I can't remember what that other plug was that had a double ground, I have a solution. On the gray connector and the other connector that has a double ground going into the plug, simply cut off the plug and connect the two ground wires together. Those are the only connections you have to worry about if you are simplifying the rats nest.

 

Awesome, that answers my question. Appreciate the answer =D

 

hey all, just gonna bump this. Below are pictures of the ground that winds throughout the rats nest and into the AVC & connects with the ISC.

You can see that the grounds are joined by a metal connector just before the rats nest split. The ground wires are Grey/Whitestripe on my automatic harness.

I will post more as I progress through the simplification process (just started it a couple days ago with leisurely taking off the harness' tape.









FEEL FREE TO CHIME IN IF I MAKE MISTAKES HA!

 

k, maybe it's black w/ white stripe (the ground) hard to tell but it should be pretty obvious which one is the ground once it's apart.

 

Few questions as im also in the process of this.

The two grounds that bolt up to the block itself. Once i removed all the emissions and ISC AWS the two grounds loop into each other and trace back towards the ecu connectors. Do i need these grounds/do they need to be rewired?

Also, for the most part my harness is fine, there is a slightly exposed wire in one of the injectors wiring. What gauge wire should i replace this with.