Paccar Forced DPF Regen on Paccar MX Engine
We are excited to present to you a new and exciting feature on the DTC + AFT Reset Tools for Paccar MX engines. This new feature will give you the ability to perform a forced DPF regen anytime, anywhere. So, if you are driving in the middle of the night and you need to do a DPF regen, you can.
While anyone can perform the forced DPF regen with the DTC + AFT Reset Tool because of the simplicity of use, you do need to understand two important concepts. You need to know what a forced DPF regen is and why you need to perform one.
What is a forced DPF regen and why do you need to initiate one?
Forced DPF Regen is different because a service tool starts the process. Passive and Active DPF regeneration happen only when the truck’s sub systems are asking for the regeneration process to start. So by initiating a forced DPF regen with a service tool, such as the Paccar DTC + AFT Reset Tool, it will allow a regen to happen regardless if the truck is asking for it. If you have fault codes that cause a derate because of the emissions system. If the AFT system faults, then you do need to perform a forced regen for those fault codes to clear. Certain fault codes require a forced DPF regen to clear.
Your Engine / AFT ECU checks for any fault codes by verifying all the sensor values are correct. The reason the manufacturer put this logic in the engine / aftertreatment computers is that they need to run through all the checks to ensure the NOx & AFT (aftertreatment) sensor values are within range. If the fault code appeared, then there is a good chance that there is a problem with your emission system and needs to be checked out.
Does a forced DPF regen clear ALL your problems?
Maybe!? The potential is there, but it all depends on what caused the derate in the first place. The DTC + AFT Reset Tool may clear your problems if the AFT (aftertreatment) system is operational, or you performed maintenance work to your AFT (aftertreatment) system and need to clear codes that require a Forced DPF Regen. If the truck passes a regen then the fault codes will clear. We touched on this topic on our EGR Derate Blog post that highlighted about a fault code (P3778) that required the truck to be forced DPF regened after repaired.
How do you start a forced DPF regen with a DTC + AFT Reset Tool?
- Start your truck and ensure that the engine temp is above 160 degrees F.
- Make sure all the PTO / High Idle switch is off
- Plug in Reset Tool in the diagnostic connector.
- RPM will rise past 1000RPM
- DPF light will come on only after the exhaust temperature reaches high enough to burn the soot.
- Leave the DTC + AFT Tool connected until the RPM’s come down.
Note: If you need to stop the regen early, then tap the brakes or accelerator pedal. If the regen does not start then you might have a certain condition not allowing the regeneration to start. This is probably why you are in derate. So you need to check for fault codes and diagnosis the issue and see why the truck is not starting the regeneration process.
If you have more questions about forced regen, check out What is Forced Regeneration to give you more coverage.
Did you purchase a DTC + AFT Reset Tool without the forced DPF regen feature, but would like the regen capabilities? No problem, upgrading is easy. Just reach out to firstname.lastname@example.org to get the process started.
Until next time 👋
Be blessed & stay safe