Signs that a 100409-000 probe is going bad?

[owenssonex]

Hi,
I have three 100409-000 fluid temperature probes. Each one has a different fluid to measure. Two appear to be consistently showing a lower than expected temperature. What should I expect if the sensor is going bad? Erratic, low, high, no reading? This is a single lead probe that does not have a ground lead. The probe is directly connected to the engine block which is well grounded. I am purchasing new sensors to try since they are inexpensive, I'm just trying to expand my understanding.

 

[Dynon]

They're generally pretty reliable, without a clear failure pattern. If they're just "off", one thing to make sure of is that they're all set to the right sensor type. For oil temperature, you want type 2. For coolant, it's type 3. Other than that, insufficient ground is the most likely cause for an incorrect temperature. But given that they're both grounding through the case (are they all making good metal on metal contact?), this may be less likely here.

 

[owenssonex]

I tried a few different grounding techniques to see if I had a ground issue. No change in behavior- my temperature is still low. It is possible that I have a lot of forced air hitting the top of the probe, but I'm skeptical.

 

[owenssonex]

Sorry, I'm missing something. How do I configure this type setting? "For oil temperature, you want type 2. For coolant, it's type 3." In the sensor mapping, I set the ems220 pin 7, the 100409-001 sensor type, and the name. I don't see any additional settings? I'm using an Hdx1100 version 15.4.7

 

[jakej]

DS was probably referring to the Legacy system, as you have the HDX the 'types' do not apply.