Technical warning light/temp gauge signal wire

[Kozmos]

according to this

and some video i found on youtube, i just have to connect that hihlighted wire from the warning light to the signal side of the temp gauge witch is already on the correct connector.
BUT! it doesn't work. so i took another wire and directly connected the signal with the coolant temperature sensor. it works for the gauge but not for the ECU witch results in bad cold start.
so i decided to follow the wire to find out where it goes. no luck. it goes through the firewall and i lose it in the engine bay. it's like the instructions say, grey and white...
the questions are where is that wire going? and what would i have to connect to replace it?

 

[Hyperspace]

What model is it? what colour is the body of the sensor under the rubber shroud?
Some models don't have a guage sensor, just a sensor that says, now I'm too hot.

 

[Kozmos]

that's what I had, just the warning light, so i used a wire to connect directly to the sensor, it worked but it took the signal from the ecu, even on the schematic it sais that the same wire is connected to the warning light and the temp gauge, even the same color. but it doesn't say that its not connected directly, so I need to find where the hell is the blody grey/white wire going. yesterday i was greased up to the elbows trying to find it with no luck.

don't know what do you mean by:

what colour is the body of the sensor under the rubber shroud?

 

[Hyperspace]

The copper plug that is the censor has a plastic part, which will be black or red I believe, I think the black just functions as a switch while the red ones will give an analog output that can run a temp guage... I might be confusing the two colours as its early morning.... someone will pitch in if I made a mistake.

 

[alexGS]

I agree with Hyperspace
Also, the wire may need to be repositioned in the plug at the instrument cluster - I think the signal for the light may arrive on a different s
pin to the gauge. The thing to do is to ground the wire at the sensor and of the gauge doesn't move (ignition on of course) then trace the circuit on the back of the cluster, to see whether the signal wire lines up.

-Alex

 

[Kozmos]

The copper plug that is the censor has a plastic part, which will be black or red I believe, I think the black just functions as a switch while the red ones will give an analog output that can run a temp guage..

didn't know about that, aniway mine is blue and it has 2 wires, one is black, ground, and the oder is gren/purple (not sure) and has a max voltage of 4.6V and it goes to the ECU witch means that the signal of the warning light comes from somwhere else and not directly or the wire changes the color somwhere and that makes me confused.
i would just need to know where does the wire (grey/white) goe, from the instrument table. when i bought the uno instrument panel with the temp, the guy had the same engine, and he just pluged it in, and it worked. in my case i think it's just a bad wire, the gauge is tested and it's not broken.

 

[Kozmos]

problem solved, for enyone that is ignorant as me, there are 2 (two) :bang: temperature sensors. Had to replace the one that has 1 wire wich is black, with one that is red, like Hyperspace said.