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Capt903 · 09-28-2015, 02:53 PM

Hey folks, I have a situation with my 2001 Fleetwood Expedition. My check engine light came on and my oil light is flashing and a buzzer is going off as it flashes. It seems like it is giving out a code of some sort but I searched and searched for information with no luck. After a sequence of flash/buzz, My oil pressure gauge will peg out then return to about the 3/4 position. Anybody had any experience with something like this? TIA

Skip426 · 09-29-2015, 05:49 PM

Questions.

Cummins ? ISB ( 5.9) or ISC ( 8.3)?

Many members, with your vintage coach and the ISC report a change up when Cummins works to repair the issue .
Change involves replacing the single oil pressure sending unit ; that signals the ECM and controls the dash gauge, to an installation of two senders, with a wiring change, so one reports to the ECM and the second controls the dash.

mrkcs · 09-30-2015, 03:56 PM

Is your engine a Cat ??

Capt903 · 10-01-2015, 06:58 AM

Quote:

Originally Posted by mrkcs

Is your engine a Cat ??

It's a ISB 5.9

Skip426 · 10-01-2015, 10:01 AM

ISB's oil pressure sending unit , is about 1/2 way between the starter and the Cummins ECM. If the sending unit has developed an oil leak , the oil could be giving the wiring a cross feed path and messing up all the functions.
I though I had a photo of the sender in the block , but all I can find is a shot of the sender loose.