What temp sensor does what?

[LTDScott]

We're trying to fix a surging idle problem with our car, and from reading here, the main coolant temp sensor mounted on the t-stat housing may be the culprit. But there are 4 different sensors on the t-stat housing, and I don't know which one does what! Based on this diagram, what sensor has what function?

[LTDScott]

ttt, nobody knows this?

[FredK]

blue: ECU
brown: instrument cluster

[LTDScott]

blue: ECU
brown: instrument cluster

I don't have any that are blue.

[rcko]

look at the connector
ones with two metal prongs are ECU (blue or black)
ones with just one prong is cluster temp gauge (brown)

[bwanac]

http://www.e30tech.com/forum/showpost.php?p=557557&postcount=2

check out this post.

[bmw325csi]

^nice post i have been looking for this. thanks

[LTDScott]

http://www.e30tech.com/forum/showpos...57&postcount=2

check out this post.

Awesome, just what I needed. Thanks!