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muddywater
Senior Member
USA
50 Posts |
 Posted - 02/17/2017 : 11:31:14 AM
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I have a 2012 ISB10 engine in a BB, setting a 4334,18 code. Research says it is a low pressure problem in the SCR system, caused by bad pressure sensor, or low pressure caused by air getting into the pickup line going to module, or bad pump in system.
I have installed clear line on pickup and return lines, finding no air bubbles in that part. I need to know what the operating pressure in the injection line is to determine if it's in the pump or the pressure sensor. Can anyone help? Thanks, Vaughn |
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torque
Advanced Member
Canada
358 Posts |
Posted - 02/17/2017 : 11:44:25 AM
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130 PSI is what BB manual says.
Have you checked the filter? |
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muddywater
Senior Member
USA
50 Posts |
Posted - 02/17/2017 : 11:49:00 AM
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| Yes, both in tank and in module. I have 127 PSI at injector, so I'm thinking it's a bad sensor, what do you think? |
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torque
Advanced Member
Canada
358 Posts |
Posted - 02/17/2017 : 12:08:22 PM
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Sounds like it could be. I have not had many problems other than the heated lines and a few tank level sensors, so not all that much experience on it yet.
2012, still warranty? Warranty 5 years. Might be worth a call if close. |
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muddywater
Senior Member
USA
50 Posts |
Posted - 02/17/2017 : 12:34:24 PM
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No warranty, it has expired because of mileage, this bus has just over 100,000 miles. I also have replace the center port in module, it is the port for the line going to the injector, inside that port there is a very small mesh screen.
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Edited by - muddywater on 02/17/2017 1:45:23 PM |
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DEF fluid injection pressure
