Long ago my ITR had a v-afc attached to the ecu harness, and I found some odd wiring tonight that I'd like to clean up. I've studied the helms diagrams and can't figure it out. I noticed this strange bare wire in ecu connector "C" (the blue clip). Can anyone tell me if it's a stock wire and if so, what it's supposed to connect? The ecu is locate off-frame to the bottom-left. There are 3 legs of the mystery wire, which I've labeled 1, 2 and 3.



Leg #1 diappears into the triple-bundle of wires (yel, gr, blue). Yellow is the CYP sensor (C29). Green is TDC sensor (C20). Blue is CKP sensor (C8).

Leg #2 of the mystery wire is partially wrapped in "oem" gray tape. It connects to the White primary o2 sensor wire (C16).

Leg #3 goes to a plain black wire that has a simple crimp "hoop" connector on the end which is bolted to a body ground. I'm pretty sure this leg is not stock.

My questions: Are legs 1 and 2 oem? If so, are they making the right connections? Is leg 3 superfluous, or is there some connection that I need to maintain?

TIA!!

 

from what it looks like, #1 and 2 is a shield. so it looks ok, #3 is the ground for the shield.

 

I'm not familiar with that term, what's a shield? The way #1 and #2 make their respective connections looks pretty "oem." However, #3 is the length of wire that concerns me. It doesn't look oem at all. Is there supposed to be a #3 leg, and if so, where is it supposed to attach?

 

shield, it basicaly do just that, acts as a shield, it wraps around the wires. prevents any radio interferance. (imagine a stainles steel braided hose, and thats what it looks like, not the same purpose thos.) the shields are suppose to attach to body ground, at one point. if you dont mind take and post apic of #3 where it has the crimp connect and where it attach to the body. if i'm imagining it correctly then i believe its stock. honda do uses crimp connect on some of the wires.

 

Here's a wider view of leg #3, which goes to the crimp ground connector.


Here's a closeup of the crimp connector. A little fuzzy.

I get it. The crimp "hoop" connector is the ground for the shielding. I found this connector bolted to one of the ecu mounting pegs. It would surprise me if this is how it came from the factory.


Modified by Batoutahell at 10:29 PM 1/28/2006

 

Those appear to be grounds.
Helms shows (page 23-61) that the grounds for the CKP,TDC, CYP sensors are connected to the Primary HO2S ground.
I think you are right about the crimp connector not being "oem".
G101 looks to be provided through the [F] engine wiring harness.

 

Good find in Helms page 23-61. But, I'm pretty sure esponet is right about the shielding. C16, C29, C20 and C8 are connected by their shielding (the dashed lines on page 23-61). The main sensor wires aren't connected, nor are their grounds connected to each other (C9 grounds C8; C21 grounds C20; and C30 grounds C29). It's the shielding around all these wires that's connected. But where does the shielding wire ground out?

Edit: I found G101, which grounds at least one end of all that shielding. G101 is the ground cable that bolts near the starter (Helms p. 23-17). I'm still trying to determine if there's another ground for that shielding.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Batoutahell &raquo;</TD></TR><TR><TD CLASS="quote">Good find in Helms page 23-61. But, I'm pretty sure esponet is right about the shielding. C16, C29, C20 and C8 are connected by their shielding (the dashed lines on page 23-61). The main sensor wires aren't connected, nor are their grounds connected to each other (C9 grounds C8; C21 grounds C20; and C30 grounds C29). It's the shielding around all these wires that's connected. But where does the shielding wire ground out?</TD></TR></TABLE>

Right, the sensors are not interconnected, but they all share a common ground.
That common ground is G101 (brn/blk wire).
From the diagram the "shielding" wire is simply part of the ground.
(Notice the dot over the CKP line, it shows a connection between the ground and the shield.) Your ground, and shield wires, are all grounded to G101, wherever that is...

 

I'm not sure the sensors share a common ground. I'm looking at the picture on p. 23-61 and I only see connection "dots" on the shielding wires. Look at p. 11-17 of the 2000 supplement. The sensor wires (C29, C20, C8) are shown running alongside their respective ground wires ( C30, C21, C9). The diagram also depicts the shielding wires. I see connection "dots" on the shielding only. There are no connection "dots" on the ground wires (C30, C21, C9).

 

Hmmm, maybe I'm not understanding this diagram.
But in the end its ALL a common ground.
The shielding is definitely a ground, and removing leg3, or grounding it, either way, should be the same.

I was assuming they had common grounds because the diagram is called "ground distribution" and the black lines were all connected? But the use of the connection point dots does make it seem like there should've been one at every intersection.

 

defenetly not oem connector. but i think at one point someone either accidentaly cut or intentianally cut the ground for the shield, and thats how they fixed it. i say just put it back on. (ground it).

btw, i think in the end they all share the same comon ground, and i think the ground for any eng. sensor is the one by the T stat. i think the shield is just grounded at the chasis ground, and i think the nearest one is on the right side kick pannel.

 

btw, imo as long as you get a good contact, it should not matter where you ground it.

 

I'll leave my extra ground where it's at. Thanks for everyone's input.