How to test engine oil level sensor?

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Mar 27, 2017
Almeria, Spain
Hi. I have been given a used engine oil level sensor to replace that in my 1HD-T engine (1994 HDJ 80), which is becoming playful. I would like to test it, but have not found a method so far. This is the sensor (part 89491-36080):


It has a connector with two poles, and the black thing on the right is a float that moves up and down. I assumed this would work like a float switch, a circuit being closed (or open) depending on the float. However, I have not been able to find any difference in the electrical continuity between poles whatever the position of the float. There is always continuity.

A new sensor will cost around 400 EUR and, beyond this detail, I would really like to know how it works. Any help would be greatly appreciated.
May 6, 2011
Davis County, UT
I'm pretty sure it really is that simple. Sounds like yours has a short. You might be able to learn more by changing your multi meter from continuity to resistance and see what's different, but you'd probably learn more by carefully inspecting and/or disassembling the sensor

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