Mystery brass plug!
Discussion
Nothing at all...in fact it's just come back from full service and nothing was picked up in this regard.
I'm assuming something like this would be plugged into something the engine bay, so now i'm confused why it would be loose in the area I found it (amongst the various wires and boxes above the carpeted panel in the passenger footwell)! Maybe it's just "spare" and not connected to anything.
I'm assuming something like this would be plugged into something the engine bay, so now i'm confused why it would be loose in the area I found it (amongst the various wires and boxes above the carpeted panel in the passenger footwell)! Maybe it's just "spare" and not connected to anything.
Edited by keppy on Friday 20th May 21:10
I'm not up to speed on the later cars and stuff but the first thing that popped into my head was temp sensor for the aircon .. the cerb etc used to have a mechanical thermostat to prevent the system overcooling and icing up. maybe the later cars have an electric system to monitor the coldness of the air .. in which case it might live in a cold air ventilation hose?
spitfire4v8 said:
I'm not up to speed on the later cars and stuff but the first thing that popped into my head was temp sensor for the aircon .. the cerb etc used to have a mechanical thermostat to prevent the system overcooling and icing up. maybe the later cars have an electric system to monitor the coldness of the air .. in which case it might live in a cold air ventilation hose?
Like your thinking....no idea though
It's due back to a specialist soon for some work, i'll mention it and see what they think it might be.I had another good look today, whilst removing various surplus wiring (old tracker, wired sat nav, iPod connector....you name it!!) and found something interesting related to this sensor.
The photo below shows the cabling area above the passenger footwell - you can see the two big air pipes top to bottom (middle and right of photo), each with a sensor installed. The one on the left has a sensor connected to the loom - cable colour is black/blue stripe; the one on the right also has a sensor installed, but not connected to the loom - you can see the empty socket on the right of the photo.
The loose sensor cable colour is black with orange stripe.
I checked the cabling schema document for the Tuscan...and guess what....neither of these colour schemes feature!
Logically one might expect the spare sensor cable could be connected into the empty socket.....but think this is a question for the specialist!![](https://thumbsnap.com/sc/P7nP7CsT.jpg[/img]</a> <a href="https://thumbsnap.com/8dTuTGTD" Target="_blank" rel="nofollow">[img]https://thumbsnap.com/sc/8dTuTGTD.jpg)
The photo below shows the cabling area above the passenger footwell - you can see the two big air pipes top to bottom (middle and right of photo), each with a sensor installed. The one on the left has a sensor connected to the loom - cable colour is black/blue stripe; the one on the right also has a sensor installed, but not connected to the loom - you can see the empty socket on the right of the photo.
The loose sensor cable colour is black with orange stripe.
I checked the cabling schema document for the Tuscan...and guess what....neither of these colour schemes feature!
Logically one might expect the spare sensor cable could be connected into the empty socket.....but think this is a question for the specialist!
Thought I'd add, I may now know what this is for with the help of a reliable source!
The two big pipes are for cabin air cooling, and the two sensors measure temperature in each - except they don't do anything. They were put in when TVR thought they might be installing climate control, but that never happened and so the sensors are connected to the car and can be read by the ECU but do nothing given the aircon is manual...but they can error.
The aircon pipes run down the left of the engine bay, and apparently they can get warm (no surprise there!) leading to an unexpected temperature through (one of) these sensors, which trigger an aircon alarm on the dash. So what some people do is wire out the sensor using a 1k Ohm resistor. But in this case it looks like a previous owner/garage has simply unplugged one of the sensors and plugged it into a loose (third) sensor which is just measuring ambient temperature - causing no errors. It's just a more expensive way (than a 1k Ohm resistor) of stopping the alarm going off.
At least that's the theory!
The two big pipes are for cabin air cooling, and the two sensors measure temperature in each - except they don't do anything. They were put in when TVR thought they might be installing climate control, but that never happened and so the sensors are connected to the car and can be read by the ECU but do nothing given the aircon is manual...but they can error.
The aircon pipes run down the left of the engine bay, and apparently they can get warm (no surprise there!) leading to an unexpected temperature through (one of) these sensors, which trigger an aircon alarm on the dash. So what some people do is wire out the sensor using a 1k Ohm resistor. But in this case it looks like a previous owner/garage has simply unplugged one of the sensors and plugged it into a loose (third) sensor which is just measuring ambient temperature - causing no errors. It's just a more expensive way (than a 1k Ohm resistor) of stopping the alarm going off.
At least that's the theory!
One pipe supplies hot air, the other cool air, and those temps are each monitored. There is also a third temp sensor which measures the mixed air temp inside the dash, which serves as the aircon plenum. The sensor you found on the floor is likely the dash plenum or ambient air temp sensor.
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