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can you by pass engine oil pressure sending unit cat c12
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RKF
Posted 9/20/2015 19:02 (#4799613)
Subject: can you by pass engine oil pressure sending unit cat c12


Nw Oregon		have a 97 freightliner with a c12 and the check engine light is coming on and is going into "shut down" i need the truck for four more days to get done before the rain. is there a way to by pass the sending unit to get finished up?
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cutchall5
Posted 9/20/2015 19:29 (#4799676 - in reply to #4799613)
Subject: RE: can you by pass engine oil pressure sending unit cat c12


Jonesville, Mi		2 or 3 wire switch?
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hillfarmer
Posted 9/20/2015 19:30 (#4799682 - in reply to #4799613)
Subject: RE: can you by pass engine oil pressure sending unit cat c12



try unplugging the sensor, and get a set of earplugs

the beeper will not stop with sensor unplugged
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RKF
Posted 9/20/2015 19:41 (#4799715 - in reply to #4799676)
Subject: RE: can you by pass engine oil pressure sending unit cat c12


Nw Oregon		it is a three wire plug
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4WD
Posted 9/20/2015 19:50 (#4799738 - in reply to #4799682)
Subject: RE: can you by pass engine oil pressure sending unit cat c12


Between Omaha and Des Moines, 7 miles South of I80

I would probably try unplugging that oil pressure sensor, too.

 But I can't say what exactly will happen(with it unplugged) = it really depends on software and its ECM's programming.

 I would hope it might just tell the ECM at register 85 psi (of oil pressure = oil pressure reading with an unplugged sensor), and you could keep running.

 What I'm not sure of, is if programming with oil pressure as part of the CAT's shutdown monitoring system(programmed to shutdown mode), then will the CAT software limit you to 1500 rpm and/or 45 mph; with the oil pressure signal as an "open circuit".(ECM knowing it is unplugged)

 

Here's a photo of location of C12 oil pressure sensor:



Edited by 4WD 9/20/2015 19:53




(C-12(1YN)partsgraphicand_9isoilpressure_2.jpg)



Attachments
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Attachments C-12(1YN)partsgraphicand_9isoilpressure_2.jpg (91KB - 458 downloads)
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RKF
Posted 9/20/2015 20:26 (#4799869 - in reply to #4799738)
Subject: RE: can you by pass engine oil pressure sending unit cat c12


Nw Oregon		Unplugged it and everything seems fine. The gauge on the dash doesn't work anymore but we'll run it anyhow. Ran the truck up the road wasn't paying attention to the rpm but I'm sure I got above 1500 rpm. I'll run it to the cannery first thing and hope for the best. Thanks for your help every one it's much appreciated.
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hillfarmer
Posted 9/20/2015 21:18 (#4800034 - in reply to #4799869)
Subject: RE: can you by pass engine oil pressure sending unit cat c12



Might be tempted, to put a manual gauge on
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