KU wiring/ where does this connect?

simons2 · 13-04-17, 11:13 AM

Hello All
After some help please. rebuilt the engine on my Ku but left with a spare wire and not sure where it connects!

Hope you can make it out in the picture green/brown and it has a live feed.
Can someone please help with a wiring diagram or a picture from under you 100 KU engine Audi??
thank you in advance and hope you all have a great bank holiday weekend.
Simon

ovalking · 13-04-17, 08:16 PM

A loose live wire does not sound right!

Are you sure this is not an earth wire? - There is one connected to the inlet manifold (at the hose bracket).

In that general area, I've also got a blue connector on the Cold Start Valve; Black Connector on the throttle body; 2 single wire connectors to the temp sensor near the valve cover bracket; and a 3 wire brown connector which just hangs there!

Sandro · 13-04-17, 10:56 PM

same with my one.. it's just hanging there

simons2 · 14-04-17, 07:56 AM

Thanks for the reply guys really appreciated.
I wondered if it was an earth but put a test light on it and switch the ignition on at it was live.
When I earth it the engine rev's rise.
Here's another picture of the wire and area.
If anyone has a picture of that area?
One of the throttle plugs has provision for 4 wires but on the inside of it only 3 plugs so it don't go there.

Hanuman · 14-04-17, 08:37 AM

There have been a couple of examples recently, where a single wire has broken off from a crimp connection, with another wire still in position. Two wires into one connection. Time and use having caused some fatigue in the joint.

So, is it switched live, by the ignition key, or because it's floating, there's some voltage there from another component. I'd use a multimeter to be sure.

If I were you, I'd also Identify the components with electrical connections within reach of that wire. Then I would find the point where that wire comes out of the harness, and look for any other wires exiting at the same point. Maybe a multi-pin connector that doesn't have connections to all of the available pins, or similar. There appears to be one close by in your second pic.

Then check if the spare wire is a similar length to those other wires, and find out if there is a missing wire. Don't go experimenting and prodding it in likely places.

simons2 · 14-04-17, 01:40 PM

I'll check again to ensure there's not part of a wiring hang out one of the plugs.
Live on ignition but again I'll check again.
Done that but no joy, however was thing about the ISV which seems to work and wonder if there is some relationship, maybe just a wild goose chase but....
There are only about dozen wires coming through that part of the loom with connectors for ISV, Temp, Throttle and warm up injector so its odd.
If someone has the same set up a few pictures of that area would be really appreciated.
thanks again to everyone above for there input thus far

Hanuman · 14-04-17, 03:14 PM

If the wire is a ground connection from a component, connected to a component that has 12 volts applied, then you might well see 12volts on this wire, even though it may normally be connected to ground.

For instance- a solenoid. Which is basically a wire wound around a bit of metal. 12v on one end, and grounded at the other- it is a solenoid. Disconnect the ground, and keep 12v connected, you'll be able to measure 12v on both sides of the solenoid. Which is in keeping with what you described with the test lamp.

simons2 · 14-04-17, 03:18 PM

OK Hanuman makes sense thanks, I'll have a look tomorrow afternoon.

ovalking · 14-04-17, 07:13 PM

I've got 2 wires to the ISV connector, 2 to the CSV, 3 to the throttle switch, and 3 to the spare hanging connector.

But that may be irrelevant as you've got an extra throttle body connection!

Your broken wire *looks* like my earth wire - it's connected to that allen screw securing the hose bracket on the back of the manifold. Have you got that?

I took some photos, but it's not an easy area to capture so doubt they will help much.

simons2 · 15-04-17, 08:00 AM

OVALKING that's great thank you so much.

Your broken wire *looks* like my earth wire - it's connected to that allen screw securing the hose bracket on the back of the manifold. Have you got that?

I've not got an earth there so I think your on the money. I'll check this afternoon and report back.

Thanks all.

14-04-17, 08:37 AM	#5
Hanuman Trickster Classic Audi Club Member Join Date: May 2009 Location: Heckling from the cheap seats, Phnom Penh, KoW Posts: 7,006	There have been a couple of examples recently, where a single wire has broken off from a crimp connection, with another wire still in position. Two wires into one connection. Time and use having caused some fatigue in the joint. So, is it switched live, by the ignition key, or because it's floating, there's some voltage there from another component. I'd use a multimeter to be sure. If I were you, I'd also Identify the components with electrical connections within reach of that wire. Then I would find the point where that wire comes out of the harness, and look for any other wires exiting at the same point. Maybe a multi-pin connector that doesn't have connections to all of the available pins, or similar. There appears to be one close by in your second pic. Then check if the spare wire is a similar length to those other wires, and find out if there is a missing wire. Don't go experimenting and prodding it in likely places. __________________ I wish they would keep the damned Chinese away now that I can go home, so that I can enjoy Fish amok and a draught Angkor Last edited by Hanuman; 14-04-17 at 08:39 AM.

14-04-17, 03:14 PM	#7
Hanuman Trickster Classic Audi Club Member Join Date: May 2009 Location: Heckling from the cheap seats, Phnom Penh, KoW Posts: 7,006	If the wire is a ground connection from a component, connected to a component that has 12 volts applied, then you might well see 12volts on this wire, even though it may normally be connected to ground. For instance- a solenoid. Which is basically a wire wound around a bit of metal. 12v on one end, and grounded at the other- it is a solenoid. Disconnect the ground, and keep 12v connected, you'll be able to measure 12v on both sides of the solenoid. Which is in keeping with what you described with the test lamp. __________________ I wish they would keep the damned Chinese away now that I can go home, so that I can enjoy Fish amok and a draught Angkor

13-04-17, 08:16 PM	#2
ovalking Grown up member Classic Audi Club Member Join Date: May 2009 Location: Ipswich Posts: 270	A loose live wire does not sound right! Are you sure this is not an earth wire? - There is one connected to the inlet manifold (at the hose bracket). In that general area, I've also got a blue connector on the Cold Start Valve; Black Connector on the throttle body; 2 single wire connectors to the temp sensor near the valve cover bracket; and a 3 wire brown connector which just hangs there!

13-04-17, 10:56 PM	#3
Sandro Grown up member Join Date: Feb 2011 Location: Chelmsford Posts: 651	same with my one.. it's just hanging there

14-04-17, 01:40 PM	#6
simons2 Grown up member Classic Audi Club Member Join Date: Jun 2012 Location: ireland Posts: 291	I'll check again to ensure there's not part of a wiring hang out one of the plugs. Live on ignition but again I'll check again. Done that but no joy, however was thing about the ISV which seems to work and wonder if there is some relationship, maybe just a wild goose chase but.... There are only about dozen wires coming through that part of the loom with connectors for ISV, Temp, Throttle and warm up injector so its odd. If someone has the same set up a few pictures of that area would be really appreciated. thanks again to everyone above for there input thus far

14-04-17, 03:18 PM	#8
simons2 Grown up member Classic Audi Club Member Join Date: Jun 2012 Location: ireland Posts: 291	OK Hanuman makes sense thanks, I'll have a look tomorrow afternoon.

14-04-17, 07:13 PM	#9
ovalking Grown up member Classic Audi Club Member Join Date: May 2009 Location: Ipswich Posts: 270	I've got 2 wires to the ISV connector, 2 to the CSV, 3 to the throttle switch, and 3 to the spare hanging connector. But that may be irrelevant as you've got an extra throttle body connection! Your broken wire looks like my earth wire - it's connected to that allen screw securing the hose bracket on the back of the manifold. Have you got that? I took some photos, but it's not an easy area to capture so doubt they will help much.

15-04-17, 08:00 AM	#10
simons2 Grown up member Classic Audi Club Member Join Date: Jun 2012 Location: ireland Posts: 291	OVALKING that's great thank you so much. Your broken wire looks like my earth wire - it's connected to that allen screw securing the hose bracket on the back of the manifold. Have you got that? I've not got an earth there so I think your on the money. I'll check this afternoon and report back. Thanks all.