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Trying again to save truck from delete. New used truck in…

Hi, Trying again to save truck...
Hi,
Trying again to save truck from delete.
New used truck in our fleet. Got derates w/o any fault codes, figured out had 0 nox conversion.
Replaced SCR w/used one, now conversion OK, but truck comes back with "P269800 Exhaust Aftertreatment Fuel Injector "A" Performance" fault active.
During regen all 3 temp rises and reaches target temp fine, all sensors in the correct positions.
Replaced AHI air supply filter/regulator due low air psi, now it's as should be at 32psi. Hydrocarbon injector not clogged, AHI module passed test fine.
What I'm missing and what I should be looking for?
Thanks
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Answered in 5 minutes by:
4/15/2020
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 2 years ago
Mike Mcmillan
Mike Mcmillan, Shop Foreman/Triage Tech
Category: Medium and Heavy Trucks
Satisfied Customers: 6,607
Experience: Volvo/Mack Master Tech, Certified with Cummins, Eaton, GM, Hino, Detroit Diesel
Verified

Hello and thank you for using Just Answer. My name is ***** ***** I'd like to try and help. I am sorry that you are having issues with your truck. I know this can be frustrating. On this fault code there are a few different things that can cause this. There has been software updates for this fault released within the last year. If it has not been updated, I would get that done on this unit. The air pressure to the AHI module should be 36-40 psi and it must be clean oil and water free air as well. If this AHI module gets water in it or debris it will fail. If all of that is fine then I would replace the AHI module. These ahi module are common replacement items on these. I would also throw an injector on it for maintenance as well. They are inexpensive. These AHI modules will usually pass the test ran with a service tool but will fail once they get some heat to them. I hope this helps you on the right path. Thank you.

Mike Mcmillan
Mike Mcmillan, Shop Foreman/Triage Tech
Category: Medium and Heavy Trucks
Satisfied Customers: 6,607
Experience: Volvo/Mack Master Tech, Certified with Cummins, Eaton, GM, Hino, Detroit Diesel
Verified
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Customer reply replied 2 years ago
Thanks,will try.
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Mike Mcmillan
Mike Mcmillan
Mike Mcmillan, Shop Foreman/Triage Tech
Category: Medium and Heavy Trucks
Satisfied Customers: 6,607
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Experience: Volvo/Mack Master Tech, Certified with Cummins, Eaton, GM, Hino, Detroit Diesel

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