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Malfunctioning temperature sensors. The temperature sensors, spread through the aftertreatment system, measure the exhaust going into and out of each filter. The first sensor is in the DOC and the last is after the SCR. The sensor’s readings measure how well the system is working, and a faulty sensor can interfere with the regen process.The forced regen still shows the DOC temp close to the DPF intake temp and the DPF outlet temp stays around 550-600 but the new thing is that forced regen …COOLANT TEMPERATURE: 209F DOC INLET: 432F DPF INLET: 421F DPF OUTLET: 411F Last edited: Jun 10, 2017. 4vmach1, Jun 10, 2017. 4vmach1, Jun 10, 2017 #71 + Quote Reply. Trucking Jobs in 30 seconds. ... During one of the parked regen the delta-p set a out of range on the data monitoring, ...Mack MP8 regen issues. 2012 CXU613 with 2012 fault codes so it's not a 2013. Truck arrived at the shop at the beginning of the week. Soot load was level 5. performed a parked regen. DOC inlet temp was bias. DPF outlet temp stayed above inlet temp during regen.DPF Outlet Temp 1000 – 1150° F DOC Inlet Temp 700 – 950 ° F DOC Outlet Temp 1050 – 1150° F DPF Inlet Pressure 0.5 psi – 1.0 psi DPF Outlet Pressure 0.01 psi to 0.9 psi Doser Injection Status gradual increase from 5% to 45% • DOC inlet temp must be at 525° F or higher to dose fuel • If over 50% and Doser line pressure is above 50 You can tell by watching your temperatures during a regen. If your DPF intake is lower then your DPF outlet, and theyre both above 800F, it's called 'inverted temps'which indicate your DOC ...more ...Still not temp. Have fault traced with G/D. Replaced egr valve. checked diff sensor,tubes,vgt lever,boost leaks,fuel pressure to A/T fuel doser and made sure it wasn't plugged. During regen the exh temps are (inlet 739) (after cat 969-978) (outlet 877-904) It goes back to idle and soot level reads the same and only code active is for soot level.Mar 18, 2018 · Tractor was towed in with engine warnings on, and in shutdown mode.Active faults for soot level high, and failed regen. due to temp. Inlet DOC temp only at 425, wont go high enough to start dosing fuel. Intake throttle valve is working. Will continue on diag tomorrow. Any thoughts? Thanks. After it stopped my truck requested another park regen. If you’re needing that many regens, you may need a new filter or perhaps a sensor. You should go see your truck manufacturer. I should add that 200° is normal temp for your dash to show. Mine goes up to about 225° before the fan kicks in and brings it back down to 200°.Nov 13, 2014 · During a parked regen on a DD15, the SCR Inlet NOx sensor should be around 200-300ppm. DD13 SCR Inlet NOx sensor is slightly higher around 400-500ppm. The SCR Outlet NOx should be somewhere in the neighborhood of 5-25ppm for all DD Platforms. The other true method in testing the NOx sensors is to perform a regular parked regen, then perform ... The addition of engine exhaust to intake air increases the over- all heat capacity of the charge, leading to a reduction of peak combustion temperature. Since ...Vocational, Technical or Tra... 5,816 satisfied customers. I have detriot DD 15 freightliner 2013. I changed the DEF. I have detriot DD 15 freightliner 2013. I changed the DEF Pump and leveling valve. Now running parked forced regen, SCR Inlet Temp is …9. Start the engine and run a Parked Regen. Monitor DOC inlet pressure and engine speed during the regen. Compare your DOC inlet pressure reading to the screen shots and descriptions below in (a and b) to determine what step to go to next. a. If the DOC inlet pressure starts out high above 10 kPa (1.45 psi) and decreases during the parked regen ...The regen temps, at least to me, look good for a 2007 emission engine. How does the dpf diff. psi look during the regen? Was the 7th inj. cleaned and if so did you …3. If all sensors check out okay, perform a Low temp by disconnecting DEF metering unit connector then navigating to the Service routines>DFP then perform a low temp regen. Then monitor DOC inlet temp & DPF outlet temp sensor readings: If the DOC oullet temp sensor reading follows the DOC inlet temp sensor reading, replace the failed DPF.25. Is the Selective Catalyst Reduction (SCR) inlet temperature lower than SCR outlet temperature by more than 38°C (68.4°F)? Example: SCR outlet temperature is 588°C (1090°F) -SCR Inlet Temp 398°C (749°F) = 171 °C (341 °F). Difference between inlet and outlet is 171 °C (341 °F), which is greater than 38°C (68.4°F)?11. After the low temp ATD regeneration has run for 20 minutes, monitor the DOC outlet temperature sensor reading. Is the DOC outlet temperature sensor reading within 25°C …Inspect the intake pressure/temperature sensor and wiring connector for signs of damaged, bent, spread, corroded or ... During parked regeneration the exhaust gases will be extremely HOT and could cause a fire if directed at combustible materials. The vehicle must be parked outside. 3. Start the engine; using DiagnosticLink start the NOx Sensor ...Engine Speed 1100 rpm (1275 rpm during first 12 minutes of regen then 1100 rpm for fuelmap ending in ZGS 999) Turbo Speed 45,000 – 60,000 (turbo is used to create pressure in the DD13 and DD15AT only) Fuel Cut Off Valve 100% (once DOC inlet temp reaches 536° F) Engine Torque Around 5% Actual Torque Load 15 – 18% (greater than 20% may ...

Got a 2018 Mack MRU with an MP7. Truck has had regen issues since we got it new, been to the dealership multiple times but Mack says they can’t duplicate the issues. Active codes as of right now. P103C00 P20EE00 P046C64 P24F700. Truck is in derate requesting a Sulfur regen. During the regen the Nox inlet is at 1026 PPM and outlet is 1773 PPM.Check the diesel particulate filter (DPF) assembly and check for any exhaust leaks, cracks, signs of melting or excessive deposits. Check the diesel oxidation catalyst (DOC) filter assembly and check for any exhaust leaks. Check the exhaust brake valve for full functionality. Check for any excessive ash accumulation in the DPF filter assembly.To create the thermal conditions necessary for soot regeneration in the CSF, fuel was injected into the exhaust pipe up-stream of the DOC (Fig.2). In this study the conditions for fuel injection were fixed to 25ml/min, 300°C inlet temperature and 49,000/hr space velocity for the DOC to generate a CSF inlet temperature of 600C.Active regeneration is usually not noticeable to the driver. The vehicle needs to be driven at speeds above 30 mph for approximately 20 to 30 minutes to complete a full regeneration. During regeneration, the exhaust gases reach temperatures above 1,000°F (550°C). Active regeneration is usually not noticeable to the driver. Ash Loading

What are the temps showing when you are running the regen? Presuming you are using DDDL? You should see the dpf inlet, the catalyst, the outlet. You want the inlet to show 400, the filter inlet at 450 and above, and the outlet at 450 and above for when the doser will open up and start heating the catalyst up more.If your psi sensor is cleared and your temps still don’t come up, you’ll need to pull the DPF’s back out and Blow or out the DOC’s. Remove the 1-box inlet and rig a good vacuum cleaner to or all that soot will settle in front of the DOC and plug at least part of them again!Apr 10, 2018 · After cleaning the doc it was reinstalled on the truck, reset doc/dpf counters. Performed manual stationary regen, the truck kicks up to 1200-1300 to start regen, the turbo speed starts at around 42k and turbo actuator 92%, egr valve position consistently stays at 0%, exhaust gas pressure about 140, intake manifold pressure about 12.5. …

Reader Q&A - also see RECOMMENDED ARTICLES & FAQs. Pressure shouldchange when valve commanded to 100%.DOC not activeM. Possible cause: ASL: DOC Inlet Temperature ASL: DOC Outlet Temperature ASL: ASL: SCR Outlet Tem.