Temperture meter sensor

I would remove sensor and connect a multimeter set to OHMS across the spade terminal and its body or if applicable across both spades on the sensor and view the result whilst applying heat to its probe. Resistance should go up or down when heated.
Pete
 
to find it is operating correctly and accurately you should check the resistance which should be (for European, USA made units are different) at 40⁰ C, 280Ω, at 80⁰ C, 68Ω, at 120⁰ C, 22Ω. No need to remove it really, and no need to use my numbers ether unless you want to check accuracy rather than if functioning or not. Just check the resistance which should be higher when cool than hot.
 
killick said:
Could someone please advise how to test the temperture meter sensor on my boats engine to check if its functioning. I am currenly not getting any reading on the meter.
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If you sre referring to a meter similar to that which you find in cars, then the sensor will be a Negative Temperature Co-efficient type (NTC).

that said, if you turn on the ignition and remove the lead going to the NTC sensor and short the lead to the meter to the engine block, then the meter should slowly climb to Full Scale Deflection (FSD).

If it fails to read, then either there is no voltage on the meter, there is a break in the wire to the meter from the NTC sensor, or the meter is broken (doubtful).

If the meter does go FSD, then the NTC sensor might be faulty. If this is the case, and you intend replacing, you will need to note the colour of the insulator which separates the spade terminal (or screw terminal) from the body of the sensor as the colour indicates the operating voltages over which the NTC sensor operates. Colours I have seen have been: black, green, blue, red and white. ;)
 
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