Yes,
One wire goes to the ECU input and the other goes to a common connection (ground). 

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Stuart MacMillan
Sent: Saturday, October 18, 2014 4:53 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Weird idle problem continues

They go into a sheath and into the ECU. The fact that is still idles at 2000 with it disconnected is puzzling, and leads me to the ECU.

-----Original Message-----
From: Neil N [mailto:musomuso@gmail.com]
Sent: Saturday, October 18, 2014 1:07 PM
To: Stuart MacMillan
Cc: vanagon@gerry.vanagon.com
Subject: Re: Weird idle problem continues

Does a portion of the temp II wires see exposure to a lot of moisture and dirt etc. ?

Maybe there's an issue further "up" the temp II wires?

On 10/18/14, Stuart MacMillan <stuartmacm@gmail.com> wrote:

> I'll go check that now, but it still idles at 2000 rpm with temp 2 
> disconnected.
>
> Stuart
>
> -----Original Message-----
> From: Dennis Haynes [mailto:d23haynes57@hotmail.com]
> Sent: Saturday, October 18, 2014 12:51 PM
> To: 'Stuart MacMillan'; vanagon@GERRY.VANAGON.COM
> Subject: RE: Weird idle problem continues
>

>
> The temps sensor gets a signal off of the ECU and sinks it to the chassis.
> As the sensor warms up the resistance goes down increasing current 
> flow which reduces the voltage at the ECU. Any high resistance in this 
> path leaves a high voltage making the ECU and idle control unit think 
> it is like
> 40 below. Yes it will run rich and if it does run idle high.

--
Neil n

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