Regeneration
Warning: Active regeneration can occur automatically anytime the vehicle is moving. The exhaust gas temperature could reach 1500°F (800°C), which is hot enough to cause a fire, heat damage to objects, 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, trees, vegetation, flammable materials, and anything else that might be injured or damaged by exposure to high heat.
See Regen Switches , below, for instructions on preventing automatic regen if necessary.
When operating conditions do not allow for emissions 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
Fig. 1, Parked Regen Message Screens
Regen Operations
Parked regen is initiated by selecting OK when the driver display screen shows ‘Parked Regen Available’ or ‘Parked Regen Required.’ See Fig.. If the vehicle is equipped with the optional digital Stop Regen feature, a parked regen can be stopped by selecting OK while the regen is in progress. See Fig..
Some vehicles may be equipped with a REGEN OFF dash switch. See . To stop a regen in progress or prevent the start of a regen, toggle the switch upwards.
Fig. 2, Stop Regen Dash Switch
Warning: During parked regen, exhaust temperatures are very high and could cause a fire, heat damage to objects or materials, or personal injury to persons near the exhaust outlet.
Before initiating a parked regeneration, make certain the exhaust outlets are directed away from structures, vegetation, flammable materials, and anything else that may be harmed by prolonged exposure to high heat.
To initiate a parked regen, perform the following steps.
- Park the vehicle away from all flammable materials, put the transmission in neutral, and set the parking brake.
- Start and warm the engine until the coolant temperature is at least 150°F (66°C).
- Select OK when the diesel particulate filter (DPF) screen is displayed on the driver display. See Fig.. Select OK again to confirm regen. As the regen process is initiated, engine rpm increases and the HEST lamp illuminates to indicate extremely high exhaust temperatures.
- The regen cycle will finish after 20 to 60 minutes, at which time engine idle speed will drop to normal and the vehicle can be driven normally. The HEST lamp will extinguish when vehicle speed exceeds 5 mph (8 km/h) or the system has cooled to normal operating temperature.
- To stop a parked regen at any time during the process:
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depress the clutch pedal, brake pedal, or accelerator pedal;
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select OK on the parked regen screen while the regen is active, then select OK again to confirm;
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press and hold the regen inhibit switch until idle returns to normal;
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shut down the engine.
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Important: The driver is responsible forensuring,during the entire regen cycle, that anything that could be harmed by exposure to high heat does not come in contact with theexhaustgases flowing from the outlets.