While changing the oil filter on my H3 (2007 - 3.7L) I noticed a set of skinny wires that were cut. Looks like they belong to the oil pressure sending unit.
However the car gives no error codes, lights, etc about low oil pressure. Searched, but couldn't find anything clear.

Before I start tearing things apart, I want to check if any of you have experience with this?
Does a cut or unplugged oil pressure sensor not generate a warning light or error?

 

Connect the Oil Pressure Sensor wires back together and see what happens.

 

Doc, good point.
I will give it a try, but easier said than done, as there's no spare wire to work with in that tight spot. Last night I while changing the belt tensioner, I had good access to the sensor plug and took it off to see what I can do. Looks like the wire was accidentally ripped apart, and not a clean cut. Will need to graft in some wire to the plug to get some material to splce.

One good outcome on this is I finally found the annoying rattle in my H3's engine bay. Under the exhaust manifold I noticed there is a small aluminum heat shield covering what seems to be an engine mount. There's a single bolt holding it, and the aluminum split around the bolt hole. I fit a wide washer on the bolt and over the crack and now it's quite. I haven't seen this shield mentioned yet on the forum as a source of rattling.

 

Hi Doc, I hooked it back up, no warning light ...
But the issue is that when it was disconnected there was no warning light, that's not right is it?

 

Did you try KOEO: IC bulb check?

 

Yes that oil symbol lights up when starting, then goes out. No further messages or warning lights when the H3 is running. The behavior was the same when the sensor was disconnected.

 

Look up what kind of oil pressure sensor circuit the H3 has. Does in measure voltage all the time and sets the warning only when pressure is below a certain range (I do not think so), or does it use a open circuit so that if oil pressure drops below a certain amount, it grounds and closes the circuit causing the light.

 

according to the wiring diagram, the switch is open circuit, closing when the oil pressure is good. There are 2 wires, both going to the PCM, Purple = low oil, and Tan/Blk = low pressure. Seems odd there is no error. I will get a new sensor and see what happens.

 

"that oil symbol lights up when starting" with the switch disconnected?

 

yes, when disconnected it works as if it were connected! It''s crazy right? I'm thinking something was reprogrammed in the PCM.