Background to what seems a brain fart on my part
In the process of working under the hood of my S4 TurboVert today, I seem to have broken a wire and for the life of me I cannot find where it goes. And I cannot remember if it's a wire that ended up not being used in the course of the swap or if it indeed goes to something.

Location
On the drivers side above the oil dip stick there is a small wire loom that has 6 wires. Three of these wires go to the TPS, two of the wires go to the air temp sensor, and the sixth (solid black in color) goes...WHERE??

Trouble shooting done so far
Since it's black, it must be a grounding wire. But looking at the FSM, looking at the color code for all plugs in the area of this wire loom, I cannot find something else that needs a black wire nor can I visually find a plug that is missing a wire.

Issues without the wire connected
Car starts and idles fine......for now.

My request
So, I'm asking any owner of an S4 TII, please take a look at this small wire loom and advise where this 6th wire goes. A picture of what it attachs to would be great.

Thanks in advance.

 

knock sensor Came to mind single clearish yellowy connector? I'll go have a look soon
See what else I can see.

 

that would be my bet. (note: yes I have s5 tii engine but loom is s4, only modded to suit the necessary s5 connectors

 

That connector, on my car one side goes to an engine grounding point and the other side of that connector goes to (at lease what is now) a yellow wire going to what appears to be the power harness.

On my S5 TVert the lone wire that doesn't go to the Air Temp or TPS is the one you described.

 

That would make my knock box under the dash odd.lol I thought they just moved it from the center plate to the front housing? Although mines a 87.5, so some change over stuff. High impedance injectors blahblah

 

You lost me lol. You have both a series 4 and series 5 turbo vert?

 

Yes I do.

The S4 is was my maiden voyage to a swap, the S5 I upped the game quite a bit.

 

Well I'm jealous and sorry I wasn't much help. Probably because my car they started some of the change over so in that loom that single black def went to the knock sensor. Although looking through the haynes wiring diagrams s4 still had the knock sensor and it's still a single black wire that somewhere along the lines joins with a g/y wire from the knock control unit(which on my car is behind the left hand side kick panel. It's rather confusing lol.

 

Anyone else have feedback what they see under their S4 TII hood?

 

Knock sensor?

 

as said, that loom you mentioned has 3 plugs on it:

TPS
IAT
knock sensor

 

Got it.

Thanks

 

You got it sorted?

 

I did. Subtle difference between TII and NA wiring for the knock sensor caused the confusion. Happens in swap set up's like mine.