Tiffin Motorhomes ALLEGRO BREEZE, Owner'S Manual

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C U M M I N S E N G I N E S
4-9
A flashing DPF lamp combined with an illuminated CHECK ENGINE lamp indicates that the DPF
needs be regenerated immediately. Engine power will be reduced automatically. When these lamps are
illuminated together you should immediately seek service from a Cummins authorized repair location.
NOTE: If the engine is unable to complete a DPF regeneration cycle, the STOP ENGINE lamp will
illuminate and the vehicle will have to be towed to a Cummins authorized repair location.
High Exhaust Temperature (HEST) Lamp
The HEST lamp is amber, and looks similar to this:
The HEST lamp indicates, when illuminated, that exhaust temperatures are high due to regeneration of
the DPF. The lamp could illuminate during normal engine operation or during stationary regeneration.
NOTE: The OEM determines whether or not the HEST lamp is installed on the vehicle. The OEM also
specifies the temperatures, vehicle speeds, and other conditions at which the lamp illuminates. Refer to
the OEM service manual for additional information regarding this lamp.
When this lamp is illuminated, make sure the exhaust pipe outlet is not directed at any surface or material
that will melt, burn, or explode.
o
Keep the exhaust outlet away from people, and anything that can burn, melt, or explode.
o
Nothing within 0.6 m [2ft] of the exhaust outlet
o Nothing that can burn, melt, or explode within 1.5 m [5ft] (such as gasoline, wood, paper, plastics,
fabric, compressed gas containers, or hydraulic lines).
o
In an emergency, turn off the engine to stop the flow of exhaust.
NOTE: The HEST lamp does not signify the need for any kind of vehicle or engine service; it
merely alerts the vehicle operator to high exhaust temperatures, it will be common for the HEST
lamp to illuminate on and off during normal vehicle operation as the engine completes regeneration.
Diesel Exhaust Fluid (DEF) Lamp
The DEF lamp is amber, and looks similar to this:
The DEF lamp indicates, when illuminated or flashing, that the diesel exhaust fluid level is low.
Diesel Exhaust Fluid (DEF) Lamp (cont.)