General Description, Regeneration
Notice: Follow these guidelines for engines that comply with EPA07 or newer regulations, or damage may occur to the aftertreatment device (ATD) and the warranty may be compromised.
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Use ultralow-sulfur diesel with 15 ppm sulfur content or less.
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Do not use fuel blended with used engine lube oil or kerosene.
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Use only approved engine lube oil. For lists of engine oils approved for Detroit Diesel engines, refer to the Engine Operator Manual, accessible on Lubricants, Fuels & Coolants on the DTNA Portal. For third party engines, please refer to the engine manual.
Important: Using non-specification fuels or oils can lead to shortened diesel particulate filter (DPF) cleaning or replacement intervals.
Important: See the engine manufacturer's operation manual for complete details and operation of the ATS.
The harder an engine works, the better it disposes of soot. If the exhaust temperature is high enough, a process called passive regeneration (regen) occurs as the vehicle is driven normally. However, if the engine isn't running hot enough, the electronic controls may initiate an active regen, whereby extra fuel is injected into the exhaust stream to superheat and reduce the soot trapped in the DPF to ash. Active regen happens only when the vehicle is moving above a certain speed, determined by the engine manufacturer. See your engine operation manual for complete details. Both active and passive regen happen automatically, without driver input.
Warning: Active regeneration can occur automatically anytime the vehicle is moving. The exhaust gas temperature could reach 1500°F (815°C), which is hot enough to cause a fire, heat damage to objects or materials, or personal injury to persons near the exhaust outlet. The exhaust temperature can remain high even after the vehicle has stopped. When stopping the vehicle shortly after an automatic regen, ensure the exhaust outlets are directed away from structures, vegetation, flammable materials, and anything else that may be harmed by exposure to high heat.
See Regen Switches, below, for instructions on preventing automatic regen if necessary.
When operating conditions do not allow for ATD filter cleaning by active or passive regen, the vehicle may require a driver-activated parked regen. When this occurs, the driver display screen presents a message indicating that a regen is required. See Fig. . The driver must either bring the vehicle up to highway speed to increase the load (thus starting an active regen), or park the vehicle and initiate a parked regen. See Regen Operations, below, for instructions on initiating a parked regen.
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Start Regen Message Screen
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Stop Regen Message Screen