Just a quick one, i bought a new coolent sensor and it comes with the newer style connector as my car has the older round one. The old connector has a black and a yellow wire. the new one has two white wires one says PED * B and one says 21 A. I'm pretty sure the black connects to the PED * B and the yellow to the 21 A, is this ok? Cheers.

 

The new sensor came with a connector as well? Why not just get the correct sensor?

 

It is the correct sensor, it just has the updated connector, it even came with instructions on how to wire it in, however it dosen't say which wire is which. the only direct fit one was standard motor products and i don't trust them, i prefered the ACdelco one.

 

I am looking at my Haynes '866' manual, page 335.

This pertains to the 5.0 L TBI engine for 1982 through 1992 Camaros.

It shows the coolant temperature sensor in the diagram (drawing) on that page.

The sensor has a 'base' that they label with rectangles 'A' and 'B'

The 'B' rectangle connects to the YELLOW wire that connects to the ECM 'C10' pin.

The 'A' rectangle connects to the BLACK wire that connects to ECM 'A11' pin.

Now for the other drawings in this manual (that pertain to the 5.0/5.7 TPI) the rectangles do not have the 'A' and 'B' labels within the rectangles. Same for the drawing for the 2.8 L MPFI.

My conclusion is that if you are sure one wire is NOT grounded to the CASE of the sensor then there is NO specific polarity for this sensor. The drawing gives me the impression that the two wires that exit the sensor externally 'float' and NEITHER are connected to the case of the sensor. So it appears to me that EITHER wire can be connected to the YELLOW wire and the other can be connected to the BLACK wire. I suspect the YELLOW and BLACK wires simply denote what the 'other end' of the wires are connected to (meaning to which specific pin/circuit of the ECM the wire is connected).