As you note, replacement DPF's don't always behave like the first oneand this is quite possibly because of the extra junk it's expected to swallowonce the engine ages. If you’ve found this article chances are you’ve been having issues with the DPF on your Isuzu truck. Even something like a loose terminal pin causing high resistance and causing a bad reading as wel. I felt it could be a problem in the system controlling the burns because of the 'jumping of the bars', but none of the service centres have said there is a way to reset or reboot the system – and I'm an English teacher, not a mechanic, so what would I know. Here is the training manual I have, maybe you can find something in there I missed. The 2018, with egr at 40% Im at 26gps, 16% load. Then went back into regen as compressor went on again. But lots of known issues that independent mechanics would of come across. The most common issue with these new trucks. Isuzu DEF Diesel Emission Fluid and DPF Diesel Particulate Filter Systems - NPR, NQR, NRR. The only - Answered by a verified Technician You’ve probably been forced to pull your truck over for a manual regeneration and possibly even experienced a severe derate rendering your truck useless and forcing a trip to the dealer. we have had the EGR valve cleaned and replaced. So it got a sensor and manifold. I guess we'll know in a few days. When I switch manual off prior to driving, it reminds me to push dpp switch. And that's the only thing I don't like, Id like to see atmosphere at idle. isuzu npr problems. We now have to resort to getting the dealers to do a forced burn every time now (about twice a month) and also do regular servicing with low ash, semi synthetic oil to give it a chance. The variableintake system was jammed partially open and the vehicle was still goingreasonably well, but just had a permanent MIL on. This proceedure can be done is a fast or slow mode, ( Slow mode can take up to 2.5 hours). Thanks that makes sense for the p2463, that was the day he drove it back when couldn’t get manual regen to work on the side of the road. If the vehicle were to be driven very far after the red light comes on, the system will go into what we call 'limp home mode' and must be taken to an Isuzu dealership to have a regeneration initiated by a scan tool. GO TO THE LOCAL AUTOPART STORE, BUT NOTHING IS AVAILABLE. What i did find weird is I have 2 trucks next to each other. Has anyone had their DPF successfully cleaned through a workshop other than the dealership? It could be a wiring problem...like a damaged loom. My Chev which takes adblu kept putting messages about the quality of the product up and I could notget rid of it so as Performax and Isuzu are linked back up to ballarat where they could not fix it (I paid 1.500) then they wanted another 1200 for two nox sensors at that point I bit the bullet as it was obvious that ISUZU did not know how to fix the problem and throwing expensive parts at it was no guarnatee it was fixed .In the end I got the car chipped o.k. Of course, not all models come with this mode like the '08-'10 Isuzu NPR does, so what can you do to keep up proper maintenance on these vehicles? When you are looking at 30 grandfor a basic diesel 4wd engine, it's not unreasonable toexpect long life. Anyone out there have any ideas? See id this helps. But I am stumped, my local Isuzu "lead tech" is stumped. I poke through and clean it. I have in the past on extreme cases even removed the DPF from the chassis and initiated a…, I checked EGR flow. A forced regen occurs when soot builds up inside the diesel particulate filter (DPF) to the point that the vehicle is no longer operable. This can be a sign leading to a failing DPF unit or AdBlue Module. I'll continue to pick at this thing…, Ok, I got it figured out. Regen wont continue because my LOAD is too low. I've already spent 6500$ trying to fix the problem n still the engine light is on.Company(Isuzu) shouldn't be introducing this system if it's not reliable.Don't want to spend any more since no one knows what the actual solution is.Just wondering if I can disable it. There are 2 complaints filed for the 2008 ISUZU NPR. The irregular burns continued. Doesn't solve your problem now. My Hino has a regen button that I can push to activate a burn if I interrupted the previous burn (did it once just to see what would happen), but the truck will automatically regen anyway once you get going again.Not uncommon to regen almost everyday, and even several times per day if doing longer distances and higher load work.Mind you, it takes all of 5 minutes (literally) to do a regen. Many of our clients have seen daily regens go to weekly or monthly regens. Thanks for the thoughts. wtf. But once cleared it never came back. I'm by no means an expert. This will make its way into the engine and cause the same issue after the repair. What requirements for each, what can kick each out. I don't know if these will perform a forced regen while in gear. HTH, Less soot = Less need for DPF regeneration. As I mentioned earlier, this should be in the service information in the tool. is everyone that's having problems getting the repairs done by an Isuzu dealer, I’d be going to the Isuzu dealer in the first instance. 2012 Isuzu NPR 5.2 Too Much Fuel, Black Smoke, Warmup, Regen. Are the NOx heaters working? The scan tool will indicate the progressive soot loading of the filter and should display any fault codes and live data, then the info helps steer the tech to the faulty area. Temps esnsors accurate? It sits at 200 - regen start for an hour. The funny thing is the truck doesn't even go into temp rise. System goes 200 - regen start. The biggest struggle I have had with forced regens on these is getting them hot enough to start. He was quite sure of himself. Regeneration may take longer if the engine is cold. Hydraulic Brake System Code Description 6 Isuzu 4HK1-TC Steel Tilt Single Cab 71 inch BBC: Bumper to Back of Cab 55698_Sec00_'07 08.2.8 11:40 AM Page 8 280km, 50km, 200km, 40km, 80km, 280km, 30km, etc. ON 03/12/12 ASK THE LOCAL AUTOPART STORE CALL DIRECTLY TO THE OEM GAS PEDAL, NONE IS … Last time i had issues like this it was the injectors. Have you run the nozzle and SCR tests? The service centre who replaced the filter thought it was a sensor problem, so that was replaced. Even then one dpf will act differently to another just on dpf type alone, much like conditions its operated in, oil used, regen strategy. We have the isuzu software at work so if you live in the Atlanta, GA area feel free to come by and get a scan and a regen. The procedure for diagnosing why is in the information. When the exhaust brake closes to warmup, idle is around 1,000 RPM. The problem is this soot, it has no-where to go and so will then begin a blockage in the DPF system and this is how common DPF Problems occur. The bars in the display that should climb fairly regularly from none, one, two and so on as the soot filled the burner, would do as expected for one burn, going out to about 280km, then next burn would go to one bar, then jump to four and five bars and then burn. isn't working it will not stay in regen. The only thing that we have been told that could be causing it is a leaky EGR or the computer needs to be reconfigured, or reprogrammed. I just thought someone may have come across a similar problem before. LOCAL AUTO REPAIR SHOP RETRIEVED THE HARD CODE TO BE THE THROTTLE POSITION SENSOR PROBLEM. As I said above, it will sit at "200-regen start" forever, then sometime it will start the regen (370-regen active) then a couple times WHILE IN REGEN ACTIVE, will kick out into regen start. So I take out the get the egt hot, I pull over at 600* and try the regen. There are a number of manufacturer initiated programsnow underway to vary the way DPF burns are conductedto extend the life of the DPF and reduce issues from the trapping of unwanted combustion products. The 2012 Im at 30gps, egr 22% but load is 1%. My feeling is that even an aging turbocharger isn't going to produce soot at a standard rate for 280km then produce soot at 400% higher rate for 30km to trigger a burn, then go back to a standard rate of soot production, then 300% more, and then normal and so on (and the short burns where the bars on the display jump from one bar to four or five happen in both city driving and open road 100km of 100kph driving). but how would you like a tube out your ass back into your mouth? I would download it, just in case Scott has to pull it. One of the problems with DPF is that when the engineis new, the DPF is filtering pretty much only soot fromthe engine, which can then be purged through the regen process. Campaign Number: 16V797000 Date Manufactured: Nov 02, 2016 Vehicles Affected: 25018 Manufacturer: Isuzu Technical Center Of America, Inc. Mfr's Report Date: Nov 02, 2016 Component: Vehicle Speed Control 2015 Isuzu Npr Vehicle Speed Control Recall 16V797000 It's at 800,000k now and the DPD filter had soot on the exit side so needed to be replaced. If your engine overheats significantly, it may suffer a catastrophic failure. Unfortunately that is the latest training manual available for purchase right now :(, What happens if you put the truck in gear, apply the emergency brake and chock the wheels? Our solution provides clients with the improved reliability they seek along with the welcome addition of increased power, smoother driveability and better fuel economy. Then it would Regen. The big problem is no one gets them cleaned.Isuzu servicing gets them sonic cleaned every 100,000kms but hardly anyone does them. Hi All, I have a Isuzu Npr light truck with a 3.0 four cylinder diesel engine (Didn't have the 3.0 option in database). I had an FRR600 where the had become a problem apparently the former ownewr every time it came up to do a burn turned the engine off in the end I think the computer just gave up trying .Took it into Isuzu ballarat and they reest the computerbut also changed part of the exhaust system as apparently they are prone to splitting which can alter the burn procedure. Problem #1 - DPD blocked, regeneration fail, engine derate. Code Description JAL ISUZU Code Description 1 4 x 2 Code Plant Location 7 Fujisawa Code Description Cab Type W Code Series 4 NPR Code Description B 10001-14000 lbs. To give you an idea that Mann Hummel Provent 200 (don't buy pretenders) will pull around 180-200ml of crankcase blowby oil out of the intake system over the 12M/15000kms service interval and even if you don't have an egr delete setup it won't be adding to your inlet manifold or DPF clogging. the stealers, sorry Dealers don't seem to be any the wiser to how they are going to rectify this but are getting restless in their seats as they are paying for this under warranty. Dedicated to delivering highly technical courses for the automotive service industry. Its time this Company was held to account. The issue of deterioration as the engine ages is still the underlying problem though I think. Thanks for the two sensible replies. Check for a cal update? To those having trouble, what Ive read it seems that the Isuzus are set up to do a regen when the DPF reaches 70% blocked, whereas the Hinos are set up to regen at only 30%, so that if you delay a regen in an Isuzu, the DPF becomes critically blocked and the truck goes into limp home mode.My question is, can you manually regen the DPF before it reaches the 70% mark? Recent Isuzu Npr recalls. It does make fire now, but it doesn't always go into the regen. Nothing I do seems to have any bearing on load. I have done many forced regens on these trucks, but never tried in gear. Mine will never warm up enough to start regen. They're checking the wiring out at the same time but feel the turbocharger could be interfering with everything else. is in the tool. this last go around I did a DOC, EGT1/2, aftertreatment injector, so except for the SCR, the aftertreatment is all new. There are DPF cleaning services if you search around- https://www.dpfregen.com.au/diesel-truck-dpf-cleaning-sydney/and you have to do a bit of homework on maintaining your DPF-http://www.oilem.com/dpf-cleaners-and-dpf-cleaning/and no doubt cleaning machine technology is advancing with the size of the problem. :shrug: Hi Jim: 2016 Isuzu Npr Vehicle Speed Control Recall 16V797000. I see nothing changing when it…, Hi Jim: Posted to Asian Electrical on 8/2/2016 5 Replies. Are you using the correct low ash engine oil?Also there should be two sensors to measure the pressure drop across the dpf. It relates to irregular regeneration burns in the DPD filter – sorry to be so wordy, but I type fast and you may need all the pieces to the puzzle if you want to try and solve it. Thanks. A commercial quality scan tool in the hands of a capable technician will be the most powerful diagnostic tool here, along with the specific service information. If you are interested to join me please email me at email@example.com. No private mechanic is going to have a sonic cleaner. In our …e, we needed to run a couple of tests (after replacing one of the sensors and possibly (?) These errors, before long, will cause the engine to go into Derate-power (Limp) mode causing it an issue to drive and can lead to further problems. The DPF was manually cleaned. If anyone out there is an Isuzu tech and has training info they would share with me it would be appreciated. As I think you know, the service information, TSBs, etc. I’m sitting in my truck as I write this sort of freaking out.. Got a Raytek? I need fact. EGR only works at low revs and cold starts but how would you like a tube out your ass back into your mouth? I don't have much in the way of answers or opinions. The Isuzu DPD (Diesel Particulate Diffuser) also referred to as a DPF (Diesel Particulate Filter) was first introduced to the … Do you have any training material explaining the different regen modes? It takes, EGT gets to 680* and it goes back to 200 regen start. I can take CAC pipes off, put pipes on, open egr, close egr, remove the cooler, nothing seems to change load. Posts on : November 3, 2020 / Posts by : / Uncategorized • You might be a technician that wishes to try to find referrals or resolve existing troubles. I have a bunch of questions though. Below is a list of complaints & problems filed against the 2008 ISUZU NPR.These problems includes information received by NHTSA from consumers either directly or as recorded by the Vehicle Safety Hotline. actually it'll be a complex mix of lubricant additives, wear metals and other non-combustible material. I have a 2011 Isuzu NPR with a 5.2 MIL and REGEN illuminated, but no engine performance problems, or derate. I have this 2012 NPR, Im calling out more professionals for assistance, seeing as many of my die hards have left the mothership and came here. the injector). This truck blows an excessive amount of black smoke on warmup. The next step is to select DPFE regeneration adpatation. That table is to decide whether a normal or slow regen is necessary. With the new filter, it began irregular burns. If this is the case, get them to clean the intercooler and other pipes of leaked oil as well. - It doesn't sound like a DPF problem necessarily, but more of a sensor issue. Your Isuzu NPR uses cooling chambers in the engine to cool the engine and prevent its internal components from seizing. After that I was able to heat up and start regen but now it keeps stopping after about 20 minutes with a "70 stop regen" pid. then 220 - temp rise. But when it DOES go regen active, that value isn't any different. EGT gets to about 800*, it goes BACK to 200-regen start and sits there half an hour, then kicks out and sets a P244C - too long in regen. I … Woah. That’s how DPF Remedy solves DPF problems starting with the first tank of treated fuel. I had already replaced the exhaust brake a couple of weeks ago, but I did take the cover off and was able to adjust the stop so it would close a little tighter. Among the top selling Isuzu trucks may very well be their older model trucks that continue to have a lot of life left in them for the right commercial enterprises. Have you gone to Isuzu Australia over the dealers head? This parameter displays the engine load in percent based on inputs to the ECM from various engine sensors. And what has to happen during each one? was a very expensive extercise, Hi I'm just going to ask a few questions about your truck if that's okay.1 what work does the truck do freight , city or long haul driving 2 does the isuzu dealer service the vehicle 3 the soot on the other side of the dpd filter did it start after any other issues engine light on , truck just serviced.4 has the wiring connection been checked over. An air leak will cause a rich mixture and too much smoke. But I am stumped, my local Isuzu "lead tech" is stumped. The mess hadn't been helped by home maintenance with cheap oil, but the mix of blow-by, EGR and extendedchange intervals had left the intake plenum with a sectional area of 4 square centimetres at the head interface instead of the normal 12. The soot on the other side of the filter can be caused be a build up of ash in the filer and while a regen is carried out can cause a hot spot in the filter and crack causing soot to leak past. I have this 2012 NPR, Im calling out more professionals for assistance, seeing as many of my die hards have left the mothership and came here. Like its waiting for something. Our other Isuzu went to 1.6million k without any problems so 800,000k may seem a lot but it has always had the best servicing and preventative maintenance and replacement of parts and, apart from this DPD filter problem, runs like a new truck. How long are you willing to wait for an outcome?
Has anyone had their DPF successfully cleaned through a workshop other than the dealership? It's been a couple of months now but I was involved with a 2016 or 17 NPR for aborting Regens. Second thing I would check would be making sure the NOx sensors aren't drifting. This is my work truck, its an Isuzu NQR chassis, engine is a 4HKI-TC. Hello, we are having the same prob...do you know the original posters email thanks? The scan tool will display a lower percentage when the engine is at idle with little or no load. We try and do regular manual burns but now it wont let us do this any more. designed to perform the important role of capturing soot and exhaust contaminants before it has a chance to be released into the environment Trouble is all new diesels will have DPF filtering as part of the emmisions standards, Not my 2015 LS Challenger which is why I bought it as the last oiler I'll own and I've deleted the soot collector-https://www.bing.com/images/search?q=diesel+inlet+manifold+clogging+picture&qpvt=diesel+inlet+manifold+clogging+picture&FORM=IGREThey have kits for popular fourbies-https://www.westernfilters.net.au/provent-kits/and strictly for off road you understand-https://munji.com.au/products/4d56-mn-common-rail-egr-delete-kit-triton-2-5l-turbo-diesel-engine, https://munji.com.au/products/4d56-mn-common-rail-egr-delete-kit-triton-2-5l-turbo-diesel-engine. Can anyone look at this problem and offer suggestions? If you can't get the exhaust temps hot enough, the truck will not regen under any circumstances. I don't know about the "glove test" but I did note the temperature of the valve, and it remained room temperature until commended open. I subbed for 3 days on Isuzu site and its the same info as on my scan tool, so that was a waste. The scan tool will display a higher percentage when the engine is running at high engine speed under a heavy load. We have seen these symptom more and more on Isuzu … yet we still continue to have problems. Thanks for the reply. Has anyone got OP email ? I have an 2008 NPS 300 4X4 with just 124,000 odd Km's with DPF/DPD problems. It's all good to have a process that works well with new engines, but the process needs to produce consistent results as these engines age. If a few workshops have already had a go at fixing it, the basics have already been checked. If the truck hasn't just been driven…, They wont regen in gear. If there are any new similar experiences out there who have managed to fix the DPF problems on similar vehicles without mortgaging the family home or taking the truck to the dump, I would like to hear from them. We have an Isuzu FVD 1000. A while ago the EXH. If the turbo oil seals are leaking, burnt oil smoke will fill the DPF quickly. Im stumped. I have IDSS and factory service info. CALL THE ISUZU NPR DEALERSHIP FOR PARTS, BUT NONE IS AVAILABLE ON NATIONWIDE. If it didn't pass the tests…, I have a Isuzu with a very similar issue right now. I perform a forced selective regen. One of the problems with DPF is that when the engine. I have two FTS800's that have been converted to 4X4 buses. The agents have relieved me of $1,300 (approx) for supposedly sorting the problem without success & cannot give me a definite solution. If I take…, There is a little bit of aftertreatment added at the end. This is even more unhelpful and this thread (among others) is why I bought a Hino. Yes, I'd say you are quite correct here. I did have a p0172 code set twice, which I cant prove out. The longer the filter is in service the amount of ash builds and negatively impacts back pressure and the rest of the follow on effect, It'll get to the point it'll have to be removed to be cleaned or replaced if not a serviceable type. When the cooling system is not working properly, the engine may end up overheating. This solution is available for the entire Isuzu truck range, for bookings contact us today. I was talking to a friend last night who works for Ryder and he said if it goes in and out of regen mode it needs injectors. You will need a really good OBDII scanner to read the codes and put the unit in a manual regeneration. Meanwhile, my hubby is having a nervous breakdown because he's worried it will stop in the worst place, as is often the way when something goes wrong (the first DPD filter stopped the truck without warning near the 400,000k mark and it had to be towed), or that he'll spend the money on injectors and turbocharger and the problem will continue. They tell me VW were experimenting with that idea but alas... Trouble is all new diesels will have DPF filtering as part of the emmisions standards My mate bought a Landcruiser v8 about two years ago and wanted to buy a new one and was told it would have DPF from 2016 he's now bought a Dodge2500 but can remove the adblu if it becomes troublesome.Mine is a 2011 silverado and the adblu caused no end of trouble had the truck chipped no more problems. And I noticed turbo boost desired is 15.2@idle and actual is 14.2@idle. I've already spent 6500$ trying to fix the problem n still the engine light is on. All well and good to do a delete until it gets a love note from the RMS for a pit and emissions inspecton, Hello, just wondering if you found out the cause of problem as this is happening to us now. Ones a 2012, ones a 2018. I kick it out and retry a few times. But ECT is good and believable, IAT is good and believable, EGR inlet, EGT1 and 2 are all believable. Need to see if they found the reason for it..dont want to spend thousands on guessesThanyou Debbie, Hi, can you see the original poster email....I would like to email them to see if they resolved probThankyou. One of the problems with DPF is that when the engineis new, the DPF is filtering pretty much only soot fromthe engine, which can then be purged through theregen process. History, in the last year, its gotten NOx1 and 2, DPF, Last time it was here for a EGT temp sensor code, where the egr temp sensor broken off in the exhaust manifold. After about 30 seconds the engine starts to load up. What criteria must be met for each stage of regen, and what changes can kick it out? My question is, can you manually regen the DPF before it reaches the 70% mark? But kicked out as the compressor disengaged. Regened for me a…. I'm curious as to the motivation on changing the DOC.
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