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bobbber · Posted: Mon Mar 31, 2008 2:30 pm Post subject: Interesting Sensor

Oops.... just starting to think about putting some things back together and I've noticed a sensor I didn't disconnect on the old engine.

i.e. I have no idea what it is, or where the connector is for it! Surprised

Anyonw have any ideas??? It's part 5 on this photo, at the back of the engine :

Thanks!

Bob
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Fiat Bravo 165 Sport

bobbber · Posted: Mon Mar 31, 2008 3:05 pm Post subject:

I'm starting to think this is the temperature warning light indicator on the dash.

Anyone confirm this?

Bob
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Fiat Bravo 165 Sport

john 33_16v · Posted: Mon Mar 31, 2008 4:30 pm Post subject:

Hi,

Mine has nothing connected to it.

John
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If it aint broke, fiddle with it until it is!
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93 33 16v Mirtle Met
08 Fiat Grande Punto Exotica Red
90 Yamaha FZR600 Genesis- Silky white/red/blue

bobbber · Posted: Mon Mar 31, 2008 4:45 pm Post subject:

Hmmm.... that's interesting - as I can't remember for the life of me removing a connector from there when I removed the old engine.

Cheerz,

Bob
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Fiat Bravo 165 Sport

lee16v · Posted: Mon Mar 31, 2008 8:41 pm Post subject:

Can't be totally positive but I think I remember someone saying it was the temp warning light. Mine has got one with a wire attached.

john 33_16v · Posted: Tue Apr 01, 2008 9:12 am Post subject:

tvatavuk · Posted: Tue Apr 01, 2008 9:28 am Post subject:

paulhide · Posted: Tue Apr 01, 2008 9:44 am Post subject:

Yeah, temp warning light sensor, wire comes from loom near wires for oil pressure sensor and starter motor. Can't remember whether it's brown or black and white.
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Owner's Club 33 Registrar. Now from P4 & S2 1.7 QV
http://www.alfa-pages.co.uk/viewtopic.php?t=5188

gritsop · Posted: Tue Apr 01, 2008 9:55 am Post subject:

Hi,

Yes this is the maximun coolant temp sensor for the dashboard. It drives the red bulb indicating that the engine has overheated.

In my motor, its an orange wire connected to the sensor.

Regards,
_________________
Thanassis Gritsopoulos
1991 Alfa 33 1.4 IE
2001 Alfa 147 1.6 Distinctive

http://www.alfa-restoration.co.uk
Parts Shop: www.alfa-restoration.co.uk/shop

Ben_nz · Posted: Tue Apr 01, 2008 10:08 am Post subject:

I think the topic of that sensor has come up before, because I seem to remember asking why on earth the overheat light needed its own sensor instead of being driven from the same one as the temperature gauge!
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"Now, all that is left to do ... is wait that something else brokens, to fix up again!"

john 33_16v · Posted: Tue Apr 01, 2008 11:33 am Post subject:

Hi,

Found it.

Sorry for duff info Bobbber, mine must have been disconnected for 6 years since the lump last came out Embarassed

It's a thin orange wire inside a thin black sleeve that comes out of the harness (inside concertina tubing) that feeds starter (as Paul said) then comes round head to feed nsf lights. The orange wire could only reach the sensor on the back of ns head.

john
_________________
If it aint broke, fiddle with it until it is!
- - - - - - - - - - - - - -
93 33 16v Mirtle Met
08 Fiat Grande Punto Exotica Red
90 Yamaha FZR600 Genesis- Silky white/red/blue

rsfruitbat · Posted: Tue Apr 01, 2008 5:38 pm Post subject:

If that one is for overheating then what are each of the ones in each throttle body for ? I assume one is for water temp but that still leaves one. Confused

rsfruitbat

gritsop · Posted: Tue Apr 01, 2008 6:16 pm Post subject:

Hi,

The other one is coolant temp sensor that feeds the ECU with temp data Wink

Regards
_________________
Thanassis Gritsopoulos
1991 Alfa 33 1.4 IE
2001 Alfa 147 1.6 Distinctive

http://www.alfa-restoration.co.uk
Parts Shop: www.alfa-restoration.co.uk/shop

Oggie · Posted: Tue Apr 01, 2008 9:35 pm Post subject:

so are you going to paint it then Laughing

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PHAT 33

rsfruitbat · Posted: Wed Apr 02, 2008 7:17 am Post subject:

Thankyou Gritsop. I can now sleep easy at night. Mystery solved.

Now how do I go about refitting all these sensors and wires Rolling Eyes

rsfruitbat

bobbber · Posted: Wed Apr 02, 2008 9:24 am Post subject:

Ade,

I have some wiring diagrams which have all the sensors listed (as long as you know what they are first)... and the corresponding wire colours. Although it's in French.

Maybe I'll translate them and put a copy on the web.

Bob
_________________
Fiat Bravo 165 Sport

Admin · Posted: Wed Apr 02, 2008 1:53 pm Post subject:

rsfruitbat · Posted: Thu Apr 03, 2008 5:05 pm Post subject:

Had a mooch and luckily I hadnt chopped anything off just taped it back into the loom. Thanks for offers though.

rsfruitbat

ZeNiTh-PbArM · Posted: Thu Apr 03, 2008 6:28 pm Post subject:

Hi,

just to make things clear in the little forest of sensors, there is one sensor for the fuel injection ECU, dipped in the coolant, another, dipped in the coolant too, for the needle temp gauge on the dash.
The third sensor is for overtemp warning light and is bolted to one of the heads because it will continue to operate even if there is a coolant loss and the engine is running dry. In that case the temperature needle goes down but luckily the overtemp light will warn you.

regards,
zp

bobbber · Posted: Fri Apr 04, 2008 9:47 am Post subject: