Not off a Z hence why I thought I'd post here.

 

It's off a 92 peugeot 205 1.8 diesel.

 

Done some research online and the consensus seems to be that the best way to test a coolant sensor is to measure the resistance with a multimeter.

Video of soime chap doing it here:

 

From what I can make out, I should be testing the resistance across the two pins on the back of the sensor.

 

 

When I took the sensor out the car and did this I got no result, zip. Aha I thought it's bust! Bought a new one but that does the same :blink:

 

After poking around a bit I found I can get a measurement if I touch one of the pins and the brass casing.

 

Does this sound right or are both my sensors bust?

 

When my multimeter leads are not in contact with anything they show the same as the top pic e.g. '1'

 

Pics of what I am doing here:

Doh, obvioulsy '1' is shown in the bottom pic!

does sound pretty normal really, perhaps just uses one pin as the signal between the sensor and ground (the casing), try heating it up with a fag lighter or something whilst your meter is on it and see how the reading changes.... (don't get it too hot tho) :)

Needs to be warmed up...Dip it in a mug of hat water for afew minutes and then measure the voltage drop..