Unless your photo above is deceiving that 3-pin connector doesn't look like anything Deutsch I've seen before. For a kickoff Deutsch 3-pin connectors are AFAIK all triangular.
I don't think I've ever seen one on a C9 though......I think that's an Ampseal connector which has lost its cover and had the locking tab broken off. They're typically used on the newer Perkapillar engines.
There are four options for a 3-wire sensor on that engine, and they are all pressure sensors, engine oil pressure being one of them.However, in both sensor groups, the ECT sensor is 2 pin so the plug in the photo is for something else. Engine oil pressure maybe?
Were you looking in the right place.? The steering charge filter is located in a compartment at cab level on the LH side of the machine. Should have a door on it. 465-6504 is the correct Part Number for that filter.Have a 465-6504 filter ordered but not sure it is applicable to my dozer. It's a canister. Have a cartridge type at my filler location. Is there another location for that # to go? Cat says its for my machine as the cartridge one also.
That’s the steering filter. I suggest that you make sure the filter bypass switch is working correctly while you are in there.Just the battery and fuse box on left. Have a cartridge one along with trans dip stick there in right side with door.
Go back to Post #24 on the previous page. In it there is a link and a reference to details how to clear Codes.You had sent me a how to on clearing codes. Can't find it. Thanks in advance!!