Regen Switches
The regen request switch, located on the dash, is used to initiate a parked regen. See Fig.. The function of the switch varies by the engine make and model in the vehicle. See the engine operation manual for switch operation details.
Some vehicles may be equipped with a regen request/inhibit switch. See Fig.. To stop a regen in progress or prevent the start of a regen, press the lower half of the switch. Regen is then delayed until the switch is no longer active.
Note: The regen switch can initiate a parked regen only when the DPF lamp is illuminated.
Fig. 1, Regen Request Switch
Fig. 2, Regen Request/Inhibit 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,set the parking brake, and put the transmission in neutral.
- Start and warm the engine until the coolant temperature is at least 150°F (66°C).
- Lift the regen request switch guard and press and hold the yellow button for five seconds. 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 drops to normal and the vehicle can be driven normally. The HEST lamp is extinguished 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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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 injured or damaged by exposure to high heat does not come in contact with theexhaustgases flowing from the outlets.