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Oil pressure sensor?
Check wiring. Make sure you have OIL first!
It might be the wiring from oil pressure sensor to B.O.S.S. system. Oil pressure wires are yellow/dark green and black ***Usually***
I have an 863F but have not had that code.
So i'm only taking a shot in the dark here.
Also check your Fuses.
Todd
Check wiring. Make sure you have OIL first!
It might be the wiring from oil pressure sensor to B.O.S.S. system. Oil pressure wires are yellow/dark green and black ***Usually***
I have an 863F but have not had that code.
So i'm only taking a shot in the dark here.
Also check your Fuses.
Todd
Last edited:
It could be a sensor issue? It is full on oil and the sender is plugged in. That's about as far as I got. Wasn't sure what the next steps are as I can't find much diagnostic info. Thanks for the reply.
Is there a specific test procedure to check the sensor or wiring? Assuming ohm the sensor? Guessing one wire is a ground and the other is a power or signal wire??
Try this link, it was an ep3 code for a bobcat 753. Probably very similar if not the same
I appreciate the input but this really doesn't give any definitive diagnostic procedure either.
Dave the Ozzie
Active member
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- May 23, 2024
- Messages
- 26
For my 763F EP is engine oil pressure related and EP-3 is "Wiring Not Connected", therefore I would logically think that your issue is one of two possibilities. One is a break in the wire or two, a broken wire within the oil pressure sensor on the engine which would also come up wiring not connected I would think. The sensor is the most likely as I had a similar issue with low hydraulic fluid pressure (HP-3) and after a bit of testing I took a $400 stab in the dark and replaced the sensor which fixed the issue. I cut the can open on the old sensor to discover a pube-hair thick wire had broken at a solder joint presumably through vibration, a design fault in my books.
Anyways, I'd first check that you haven't got a broken wire by tilting the cab to access the BOSS module, there's no reason to think your's is any different, loosen the 3x7/6 nuts holding the module and push module up as there 3 cup-head bolts sitting in the slots of keyholes cut into the cab frame, all done from underneath/outside of the cab, not inside. You can either find the yellow wire with a green stripe (E1 terminal) and pierce the wire with a tester probe or remove the two terminal connectors with a 1/4 socket, then simply do a continuity test from here to the same wire on the engine oil pressure sensor connector. If it's good then I'd bet that you need a new sensor.
Thank you very much for the info! I ordered a pressure sensor yesterday, I think I will start there. If that doesn't fix it I will check the continuity. Only wire I need to check is the yellow wire at the sensor plug to the boss module? Thanks again!
Dave the Ozzie
Active member
- Joined
- May 23, 2024
- Messages
- 26
I reckon the sensor will fix it although in saying that Bobcat don't run the best wiring harnesses and have a tendency to rub through where they attach to the metal clips. I bought my machine 15 months ago and came with the HP-3 fault on the screen which uses the same digit characters as the hour meter display, so I had no idea how many hours was on it or where to start looking for the fault. I checked continuity as described above and was good to go so I took a gamble on the expensive sensor. That fixed that issue but immediately another fault popped up for water temp.
I was extremely fortunate enough to have scored a copy of the wiring schematic from my local dealer, otherwise I would been flying blind, so I did a continuity test on the temp circuit and it failed. I gave the end the cable a little tug where it enters the loom at the sensor end and it came out in my hand with a 6" tail as the retaining clip had rubbed through the outer sheave of the harness plus this one wire. I eventually got it sorted and found out it had 2,500 hours on, not bad for a 25 year old machine but it did spend the last 4 years broken down out in the weather at the front of a mate's house prior to me purchasing it reasonably cheap.
