Possible causes of this fault code include:I need to know what may be the cause for these codes on my Kenworrth T700 and how do I fix themESN 79552266(J1587 FMI 1) (J1939 FMI 18) SPN 4364 Code 3582 Aftertreatment SCR catalyst conversion efficiency-data valid but below normal operating range- Moderatley severe level(J1587 FMI 5) SPN 5491 Code 3564 Aftertreatment DEF line heater relay - Current below normal or open circuitRemove DEF nozzle from the Aftertreatment Device (ATD) box. 10. Flush warm water into DEF air pressure and temperature sensor cavities in the DEF metering unit until water flows ... (SCR) Inlet Temperature 2 SPN 3364/FMI 1 - EPA10 ... Retain the log file. Does the NOx conversion efficiency rise and stay above 70% (0.70) during the regeneration ...SPN-4364 18 Aftertreatment 1 SCR Conversion Efficiency Jan 30, 5:07 PM Jan 30, 5:09 PM Intermittent SPN-3226 2 Aftertreatment 1 Outlet NOx 1 Jan 14, 9:12 AM Jan 30, 6:59 PM Constant SPN-3226 2 Aftertr … read moreSTEP 3: Clean all your aftertreatment components. This includes all the components that have been contaminated by the oil, fuel, and coolant. Clean exhaust system piping after the turbocharger to the inlet of the DOC filter. Clean all temperature sensors and pressure sensors (use electrical cleaner).Jan 31, 2019 · Brought ECC SPN-4364 18 Aftertreatment 1 SCR Conversion Efficiency Jan 30, 5:07 PM Jan 30, 5:09 PM Intermittent SPN-3226 2 Aftertreatment 1 Outlet NOx 1 Jan 14, 9:12 AM Jan 30, 6:59 PM Constant SPN-3226 2 Aftertreatment 1 Outlet NOx 1 Oct/14/2018 7:33 PM Jan 12, 4:59 PM Constantemissions is to use exhaust gas aftertreatment with an SCR catalytic converter. Very low limits for both nitrogen oxide and diesel particulates can make the use of such an SCR …Cumminsfi ISX15 CM2350 X101 Engines with SCR setting fault codes 3556-18 (FC3167), 5298-18 (FC1691), ... Aftertreatment 1 Diesel Oxidation Catalyst Conversion Efficiency - Data Valid But Below Normal Operating Range - Moderately Severe Level ... Figure 1: Missing Poppet - EcoFitTM Aftertreatment Fuel Injector IK0700072 -ISX Setting 355618 ...Comments on: Cummins X15 CM2350 X116B Performance Series (2018 & Newer) Fault Code: 5655 PID: SPN: 4364 FMI: 31 Aftertreatment 1 SCR Conversion Efficiency- condition ExistsThrowing code 3582 for aft scr catalyst conversion efficiency. - Answered by a verified Technician ... Active code 5655. Aft scr conversion efficiency. This the only code active or inactive. ... i have a cummins isb 6.7 with codes 3543 NOX limits have been exceeded due to poor def quality. and o have code 3582 aftertreatment 1 scr conversion ...Mack with cummins LS 350 serial # 74163048 we have fault code 5655 after treatment 1 SCR conversion efficiency - condition exists. Truck seems to ALWAYs have the check engine and lighting bolt diagnostic lights on in dash. Answered in 5 minutes by: Technician: Nich M. Nich M., Cummins/Caterpillar Technician. Category: Medium and Heavy Trucks.File: 189-t06-5655 Page 1 of 15 ISX15 CM2350 X101 Fault Code: 5655 | SPN: 4364 | FMI: 31 Aftertreatment 1 SCR Conversion Efficiency - Condition Exists 1 Fault Code 5655 requires that ALL solutions be performed 2 Check for primary fault codes 3 Aftertreatment diesel exhaust fluid is contaminated 4 Aftertreatment exhaust system leaksAftertreatment #1 SCR Catalyst Outlet Gas Temperature : Voltage Below Normal : Electrical System Inducement : 4364-17 : Aftertreatment #1 SCR Catalyst Conversion Efficiency : Low - least severe (1) SCR System Inducement : 4377-2 : Aftertreatment 1 Outlet NH3 : Erratic, Intermittent, or Incorrect :Joined: Jun 2013. RE: 2015 international prostar scr issues. just found this post. Must have gotten lost in the noise. According to the likely out of date print-out I have on SPN codes, the ... SPN: 4364 FMI:18 -- should be cummins fault code 3582. Fault code 3582 = Aftertreatment SCR Catalyst Conversion Efficiency - Data Valid But Below …AS019 SCR outlet temperature. AS035 SCR inlet NOx sensor. AS036 SCR outlet NOx sensor. AS101 NOx conversion efficiency. You also need to do a parked regen and if the NOx conversion efficiency rises above 70% simply clear the codes and go on about your business. If it doesn't get above 70% then you need to replace the SCR outlet NOx sensor.If the SCR NO x conversion efficiency is 80%, in order to achieve a tailpipe NO x standard at 0.2 g/(hp.hr), the engine-out NO x level can be relaxed to approximately 1 g/(hp.hr) by using SCR. If the SCR efficiency reaches 95%, engine-out NO x can be increased to 4 g/(hp.hr) when the tailpipe NO x needs to be 0.2 g/(hp.hr). The early fuel ...The cold-start NRTC test shows a low SCR conversion efficiency for almost the first half of the cycle due to the SCR not reaching the operating temperature fast enough. ... SCR aftertreatment was demonstrated on two 25-50 hp engines, including a ride mower and skid steer. The SCR aftertreatment systems provided NOx emissions reductions ...If the SCR NO x conversion efficiency is 80%, in order to achieve a tailpipe NO x standard at 0.2 g/(hp.hr), the engine-out NO x level can be relaxed to approximately 1 g/(hp.hr) by using SCR. If the SCR efficiency reaches 95%, engine-out NO x can be increased to 4 g/(hp.hr) when the tailpipe NO x needs to be 0.2 g/(hp.hr). The early fuel ...Diesel exhaust thermal management technologies have been widely used to increase the exhaust gas temperature and the aftertreatment efficiency to meet strict emissions regulations [[12], [13], [14]]. ... The highest SCR conversion efficiency occurs at 250–450 °C, and the turning point is the position where the exhaust gas temperature …To reduce NOx emissions, a 1.9 kW heater was used upstream of an SCR to improve urea solution evaporation, decomposition and hydrolysis. ... 2.2.1. Aftertreatment system and instrumentation. ... The conversion efficiency for CO and THC emissions, while EHC is off, are 11% and 44%, respectively. However, 443 W of electrical heating yields ...1.67wt% Cu/CeO2 Single Atom Catalyst Is Highly Active and Durable for CO Oxidation. 1%CO, 4%O2balanced with Ar. 300,000 mL·gcat-1·h-1, 20mg catalyst. Thermally durable 1.67wt%Cu/CeO2 single atom catalyst was synthesized using atom trapping (800°C in air). T90~85°C maintained: as-synthesized, HTA (10% H2O in air for 9 h at 750°C), oxidative ...The SCR-1 will employ stainless steel torus-shaped vacuum vessel with a major radius of 460.33 mm and a cross section radius of 110.25mm. A typical SCR-1 plasma will have an average radius 42.2 mm and a volume of 8 liters (0.01 m3), and an aspect ratio of 5.7. The magnetic resonant field will be 0.0878 T, and a period of 2 (m=2) with a ...A high performance aftertreatment system enables your engine to be tuned for maximum efficiency at all times. The Diesel Oxidation Catalyst (DOC), Diesel Particulate Filters (DPF), and Selective Catalytic Reduction catalyst (SCR), along with sensors and dosers, treat the emissions from the engine. Without these devices your engine would need to run much higher EGR […]To reduce NOx emissions, a 1.9 kW heater was used upstream of an SCR to improve urea solution evaporation, decomposition and hydrolysis. ... 2.2.1. Aftertreatment system and instrumentation. ... The conversion efficiency for CO and THC emissions, while EHC is off, are 11% and 44%, respectively. However, 443 W of electrical heating yields ...AS019 SCR outlet temperature. AS035 SCR inlet NOx sensor. AS036 SCR outlet NOx sensor. AS101 NOx conversion efficiency. You also need to do a parked regen and if the NOx conversion efficiency rises above 70% simply clear the codes and go on about your business. If it doesn't get above 70% then you need to replace the SCR outlet NOx sensor.For reference, one micron is equal to 1 millionth of a meter, or 0.001 millimeters (mm). Diesel Exhaust Aftertreatment Systems. Now that we have an understanding of the science behind common aftertreatment methods, let’s have a look at the diesel aftertreatment systems installed on common vehicles. Diesel Oxidizing Catalyst (DOC)A. Heavy-duty diesel-fueled engines are based on lean combustion, compression ignition (CI) engine technology and use SCR to control NOX and a diesel particulate filter (DPF) to control PM. Heavy-duty natural gas engines, on the other hand, can either use spark-ignited (SI) stoichiometric combustion engine technology or CI dual fuel high ...The urea conversion increases slowly with the increase of decomposition distance. For the systems with one and two mixers, the introduction of mixer significantly improve the urea conversion efficiency. At the position of 0.876 m downstream the injection, the urea conversion in the system without a mixer is 30％. In the system with one mixer ...It takes like 5 min and the sensor can cost 2-3 hundred bucks. Details for Cummins fault code: 3545. 3226-10 Aftertreatment 1 Outlet NOx Sensor - Abnormal Rate of Change. Reason. Aftertreatment Outlet NOx Sensor Circuit - Abnormal Rate of Change. The aftertreatment outlet NOx sensor reading is not valid. Effect.Cumminsdr, I am working on a 2015 Peterbilt 389 VIN 288435 with an ISX15 ESN 79786048. It has an active code 5655 Aftertreatment 1 SCR conversion efficiency concern exists. I have insite but for some reason it is not opening the Troubleshooting section. It says there is no internet connection and there is actually a good connection.Aftertreatment 1 Diesel Particulate Filter Soot Load Percent. Source+ Exhaust wait theres more! ... TxId: 0 SPN: 4364 – Aftertreatment 1 SCR Conversion. TxId: 0 SPN: 4364 – Aftertreatment 1 SCR Conversion Efficiency FMI: 18 (Low—moderate severity) ...Issue Summary Symptom: The SCR System test fails the NOx sensor rationality portion of the test, directing the technician to replace the NOx sensors. Root Cause: If the unit has over 200 engine hours and has not had the aftertreatment replaced, proceed with published troubleshooting direction.SPN: 4364. FMI: 18. Lamp: Amber. SRT: NOx conversion across the SCR catalyst is too low. Possible reduced engine performance. Possible causes of this fault code include: Malfunctioning aftertreatment diesel exhaust fluid dosing system. Exhaust system leaks.A method includes interpreting NOx data indicative of an amount of NOx exiting an engine and an amount of NOx exiting an exhaust aftertreatment system coupled to the engine, determining a NOx conversion efficiency fault is present based on the amount of NOx exiting the engine and the amount of NOx exiting the exhaust aftertreatment system, and determining at least one of a selective catalytic ...Heavy truck thermal efficiency Cost effective emission control Combined NOx and PM emissions • Total planned project funding - $1.6M DOE share ... PNNL/PACCAR DPF-SCR AFTERTREATMENT INTEGRATION 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 100 200 300 400 500 Pressure Drop, relative Temperature, °C 150 g/L catalyst; 500 ppm NO 2; 35k GHSVYour SCR module (1-BOX) has failed and it's not converting NOx internally. ... It has a low NOx conversion efficiency and bad quality DEF. The NOx outlet sensor have been charged and brand new DEF pump replaced.The dosers cleaned and inspected air supply checked,voltages check all of the wiring inspected. All of the temperatures pressure dosing ...File: 145-t05-3582mr Page 1 of 12 FAULT CODE 3582 (MidRange) - Aftertreatment Selective Catalytic Reduction (SCR) Catalyst Conversion Efficiency - Data Valid But Below Normal Operating Range - Moderately Severe Level Associated Procedures Procedure Title Procedure Number Service Model Name Bulletin Number Aftertreatment Selective Catalytic ...Heavy truck thermal efficiency Cost effective emission control Combined NOx and PM emissions • Total planned project funding - $1.6M DOE share ... PNNL/PACCAR DPF-SCR AFTERTREATMENT INTEGRATION 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 100 200 300 400 500 Pressure Drop, relative Temperature, °C 150 g/L catalyst; 500 ppm NO 2; 35k GHSVWhat is claimed is: 1. A system, comprising: an exhaust aftertreatment system comprising a first sensor; and a controller configured to: determine an ammonia-to-nitrogen ratio using a sample ammonia input value and a sample NOx input value; receive an actual NOx input value and an actual ammonia input value; receive an emission value from the first sensor; determine a NOx emission estimate, an ...Malfunctioning SCR catalyst Degraded, diluted, or incorrect DEF DEF deposits in decomposition tube. This fault code can be set as a result of multiple failure modes. All steps of the troubleshooting tree must be completed. Possible Cause: 1) Aftertreatment DEF dosing unit filter failure 2) ECM calibrationOptimizing the On Board Diagnostic System (OBD) to Monitor for Reduction of the SCR Catalyst Conversion Efficiency using the NOx Sensor 2010-36-0198. ... In case of efficiency reduction of the aftertreatment system, due to the low quality of the SCR reagent liquid, physical damage or catalyst aged, the current softwares are ready to detect the ...Jan 12, 2022 #1. RunningAces Road Train Member. 1,193. 2,397. Jul 2, 2017. 0. Engine light came on today and got this code SPN 4364 FMI 31. Engine is a isx15 …Fault Code 5655: Aftertreatment 1 SCR Conversion Efficiency - Condition Exists. ... 100%. 100% found this document useful. Save Fault Code 5655: Aftertreatment 1 SCR Conversion Efficiency - Condition Exists for later. Engineering Mathematics Questions and Answers. Document. Engineering Mathematics Questions and Answers. Added by Zaky Muzaffar ...This code sets when the Aftertreatment Control Module (ACM) detects that the Selective Catalyst Reduction (SCR) NOx conversion efficiency is low. MONITORED PARAMETER: 1. SCR inlet NOx sensor. 2. SCR outlet NOx sensor. TYPICAL ENABLING CONDITIONS: 1. Diesel Exhaust Fluid (DEF) dosing enabled. 2. 1000 to 2100 rpm. 3. 15 to 100% load. MONITOR ...The NOx conversion efficiency average for the 2xFUL system has indeed been reduced slightly from the FUL of 91.12% to 2xFUL of 90.57%, confirming the minor effect of longer aging time on the SCR performance. A NOx conversion mean of 88.5% at a standard deviation of 1.351 for the accelerated aged sample is required to achieve our 90% coverage.SCR efficiency was lower than 60% for the vehicle speed range of 25 km/h∼ 40 km/h, and the efficiency of ACCT system was higher than 65% in the corresponding speed range.74212160 Eng #Nox sensors are new. 5655 after treatment 1 scr conversion efficiency. 3151 after treatment 1 scr catalyst system missing. I drained the def fluid, inspected the def system for leaks. Technician: Nich M., Cummins/Caterpillar Technician replied 2 years ago.Cummins fault code 5655 (Aftertreatment 1 SCR Conversion Efficiency) ... i have a cummins isb 6.7 with codes 3543 NOX limits have been exceeded due to poor def quality. and o have code 3582 aftertreatment 1 scr conversion efficiency. valid data , but below normal operation ...Cumminsfi ISX15 CM2350 X101 Engines with SCR setting fault codes 3556-18 (FC3167), 5298-18 (FC1691), ... Aftertreatment 1 Diesel Oxidation Catalyst Conversion Efficiency - Data Valid But Below Normal Operating Range - Moderately Severe Level ... Figure 1: Missing Poppet - EcoFitTM Aftertreatment Fuel Injector IK0700072 -ISX Setting 355618 ...🤩🤩🤩Exciting News:We officially launched our ecommerce website, where we offer very affordable quality aftertreatment emission DPF, DOC, SCR, clamps and ga...Meet the Experts. Aftertreatment 1 SCR Conversion Efficiency 4364 fmi 31 volvo 670. 2015. 610000. Changed pretty much all of the diesel - Answered by a verified Technician.gen oxide. A SCR system can subsequently remove up to 90 percent of the nitrogen oxide produced during the combustion process from the exhaust gas. Fig. 4: Schematic of the operating principle of the SCR system In the SCR catalytic converter, ammonia converts the nitrogen oxides into water vapor and nitrogen. For thisA malfunctioning diesel oxidation catalyst. A malfunctioning aftertreatment fuel injector. Possible Cause: 1) Aftertreatment fuel injector. 2) ECM calibration. Make: CumminsEngine: ISX15 CM2350 (2013-17)PID: SID 380SPN: 5298FMI: 18Description: Aftertreatment Diesel Oxidation Catalyst Conversion Efficiency- Data Valid..As technology continues to advance, energy efficiency has become a top priority in various industries. One of the key areas where this is evident is in lighting solutions. Gone are...Throwing code 3582 for aft scr catalyst conversion efficiency. - Answered by a verified Technician ... Active code 5655. Aft scr conversion efficiency. This the only code active or inactive. ... i have a cummins isb 6.7 with codes 3543 NOX limits have been exceeded due to poor def quality. and o have code 3582 aftertreatment 1 scr conversion ...Mack with cummins LS 350 serial # 74163048 we have fault code 5655 after treatment 1 SCR conversion efficiency - condition exists. Truck seems to ALWAYs have the check engine and lighting bolt diagnostic lights on in dash. Answered in 5 minutes by: Technician: Nich M. Nich M., Cummins/Caterpillar Technician. Category: Medium and Heavy Trucks.SPN-4364 18 Aftertreatment 1 SCR Conversion Efficiency Jan 30, 5:07 PM Jan 30, 5:09 PM Intermittent SPN-3226 2 Aftertreatment 1 Outlet NOx 1 Jan 14, 9:12 AM Jan 30, 6:59 PM Constant SPN-3226 2 Aftertr … read moreDiesel Exhaust Fluid (DEF) also known as AdBlue®, is used in the aftertreatment system to reduce NOx. DEF is composed of 32.5% urea (CO (NH₂)₂) and demineralized water. DEF is sprayed and then spread into the exhaust gas via a mixer before entering the Selective Catalytic Reduction (SCR) system. As DEF enters the system, it evaporates into ...Goodafternoon Steve, My name is*****'m an owner operator in a lease purchase program and I've got an SPN 4364 Aftertreatment 1 scr conversion efficiency reading and a check engine light while hauling a load uphill in 9th gear at 1400 rpm on my 2015 Cascadia.Joined: Oct 2013. 1 11-07-2014, 07:35 AM. We had a customer bring in a 2012 Freightliner with a DD13 in today with a check engine light on. These are the codes that came up: (Active)SPN 4364 FMI 1 SCR NOx Conversion Efficiency Very Low. (Active)SPN 4364 FMI 18 SCR NOx Conversion Efficiency Low. (Active)SPN 3364 FMI 2 Improper DEF …Urea catalytic selective converters can reduce NO x emissions from diesel and lean-burn engines to meet stringent environmental regulations [10], [11]; however, these aftertreatment systems require to maintain a thermal window for the best deNO x efficiency. The main parameters that determine the conversion rate of SCR systems are [12]:Optimizing the On Board Diagnostic System (OBD) to Monitor for Reduction of the SCR Catalyst Conversion Efficiency using the NOx Sensor 2010-36-0198 Due to the independent operation of the aftertreatment system from the engine, the aim of the OBD system (On Board Diagnostic) is to guarantee the powertrain emissions stay within the emissions ...Cummins X12 CM2350 X119B (2018 & Newer) Fault Code: 5655 PID: SPN: 4364 FMI: 31 Aftertreatment 1 SCR Conversion Efficiency- Condition Exists - …Over the last year, I have spent thousands of $$ in dealer charges for troubleshooting various aftertreatment system faults and issues. In April, dealer found SPN 4094 FMI 18 (Nox limits exceeded), SPN 5298 FMI 2 (Diesel oxidation catalyst conversion efficiency - data erratic, intermittent, or incorrect), and SPN 5394 FMI 17 (aftertreatment DEF dosing valve - valid but below normal operating ...It is necessary to use the "Reset All Faults" command in INSITE? electronic service tool to clear this fault code and turn off the amber CHECK ENGINE lampDescription This Code Sets When the Aftertreatment Control Module (ACM) detects That the Selective Catalyst Reduction (SCR) NOx Conversion Efficiency is Low Monitored Parameter SCR Inlet NOx Sensor and SCR Outlet NOx Sensor Typical Enabling Conditions Diesel Exhaust Fluid (DEF) Dosing Enabled, 1000 to 2100 rpm, 15 toCascadia code. SPN 4364 FMI 18 SCR NOX Conversion Efficiency Low. clean dpf. new def doser. clean egr cooler, new egr valve, int sensor delta P. all t sensor new. nox both new. on force regen all its good - only one think nox ratio 0.75. help to figureout.30. NH3_LDS [ppm] 40. 50. Steady state performance on HD diesel engine. Test stand fitted with SCR aftertreatment system. Sensors tested at 200 C & 400 C steady-state exhaust gas conditions. Ammonia slip between 0 and 50 ppm. Chart shows sensor output plotted against LDS instrumentation NH3 output signal.Fault Code 5655: Aftertreatment 1 SCR Conversion Efficiency - Condition Exists. ... 100%. 100% found this document useful. Save Fault Code 5655: Aftertreatment 1 SCR Conversion Efficiency - Condition Exists for later. Engineering Mathematics Questions and Answers. Document. Engineering Mathematics Questions and Answers. Added by Zaky …PNNL/PACCAR DPF-SCR AFTERTREATMENT INTEGRATION OVERVIEW Start - Oct 2008 Finish - Oct 2012 58% complete Barriers addressed Cost effective emission control Heavy truck thermal efficiency Combined NOx and PM emissions • Total project funding - $1.6M DOE share - $1.6M I.K. Contractor share • $200K received in FY09 • $400K received ...5655. 4376 3 3577. 4376 4 3578. 4376 7 4157. 4752 18 3342. 4765 2 3315. 4765 3 3314. 4765 4 3313. 4765 16 3251. 4792 14 4585. 4794 31 3151. 4796 31 1664. 5018 11 2637. 5019 2 3138. 5019 3 3136. 5019 4 3137. 5024 10 3649. ... Aftertreatment 1 SCR Conversion Efficiency - Condition Exists Aftertreatment Diesel Exhaust Fluid Return Valve - Voltage ...Table 1. SPN 520371/FMI 16 Description The Fault Indicates High DEF Delivery Monitored Parameter NOx Conversion Efficiency Typical Enabling Conditions Closed Loop DEF Dosing Monitor Sequence None Execution Frequency Always Enabled Typical Duration Two Seconds Dash Lamps None Engine Reaction None Verification Parked SCR Efficiency …When a DTC is set, that code description will tell you what part of the after-treatment system is at fault. On this truck, there was a code 3866 " Theafter-treatment 1 diesel exhaust fluid quality, " stored as an active code in the ECM. An active code merely means that the fault is happening "now.".where: K - fractional conversion of SO 2 to SO 3 m - mass, kg/kWh w S - weight fraction of sulfur in fuel M - molar mass, kg/kmole V - volume, m 3 /kWh R A/F - engine air-fuel ratio, kg/kg ρ exh - exhaust gas density, kg/m 3 x - hydration ratio of H 2 SO 4 in sulfate particulates c - concentration in the exhaust gas, kg/m 3 Indexes: F - fuel; S - sulfur; sulfate - sulfate particulates; exh ...where: K - fractional conversion of SO 2 to SO 3 m - mass, kg/kWh w S - weight fraction of sulfur in fuel M - molar mass, kg/kmole V - volume, m 3 /kWh R A/F - engine air-fuel ratio, kg/kg ρ exh - exhaust gas density, kg/m 3 x - hydration ratio of H 2 SO 4 in sulfate particulates c - concentration in the exhaust gas, kg/m 3 Indexes: F - fuel; S - sulfur; sulfate - sulfate particulates; exh ...New Shop Info: https://goo.gl/maps/HzwG98iioszjQWRP6TAT Express Inc.972-225-30174140 Langdon Rd.Dallas TX 75241Conversion Efficiency/ Conversion efficien.... Possible causes of this fault code include:kn. 2014-4-1 · The NOx conversion efficiency o Fault is SPN 4364 FMI 18 - Aftertreatment SCR Catalyst Conversion Efficiency - Data Valid but Below Normal Operating Range - Moderately Severe Level. I have access to Quickserve and Insite. According to the diagnostic tree on Quickserve, first step is to check for other codes active or inactive. There are no other codes in the system.Aftertreatment 1 Diesel Oxidation Catalyst Conversion Efficiency - Data Valid But Below Normal Operating Range Moderately Severe Level 34822 1925 Aftertreatment Fuel Shutoff Valve - Data Erratic, Intermittent, or Incorrect IK0700072 -ISX or N13 Setting 355618 (FC3167), 529818 (FC1691), or 34822 (FC19...Page 1 of 3 Reason: Aftertreatment SCR Catalyst Conversion Efficiency - Da Truck exhaust and emission aftertreatment systems explained | Fleet Maintenance. Load More Content. Aftertreatment systems affect vehicle efficiency and performance. 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