EMISSION SOLUTION AND CONTROL
AFTERTREATMENT, MACK
Warning and Inducement
Instrument Cluster Icons
Aftertreatment icons are displayed on
the instrument cluster. There are three
aftertreatment icons:
• Parked Aftertreatment DPF
Regeneration Required
• High Exhaust System Temperature
(HEST)
• Aftertreatment DEF Tank Low Level
Indicator
The aftertreatment DPF Regeneration
Required icon ashes when the Diesel
Particulate Filter is full or overfull and
regeneration is needed.
The High Exhaust System Temperature
icon illuminates when a parked
Regeneration is initiated. It also
indicates high exhaust gas temperature
during passive regeneration. When the
HEST icon is illuminated, do not park or
operate the vehicle near people, or any
ammable materials, vapors, or
structures.
The Aftertreatment DEF Tank Low Level
Indicator icon illuminates when the uid
level is low. It also ashes when the level
becomes critically low.
Malfunction Indicator Lamp
If the MIL lamp comes on (or stays on
after the vehicle has started), the engine
diagnostic system has detected a
possible fault in the emission control
system. Driveability may be affected,
see an authorized Mack® dealer as
soon as possible for inspection.
• MIL indicates government Regulated
On Board Diagnostics (OBD) faults.
• The MIL is illuminated when there is
an OBD malfunction. When a
malfunction is detected, the OBD
system stores a pending code. If the
identied malfunction is again
detected before the end of the next
driving cycle, the OBD system
illuminates the MIL continuously. The
system stores the pending conrmed
code. The MIL cannot be used for
any other purpose.
• If the malfunction is no longer
detected in three drive cycles, the
MIL is turned off at the next engine
start.
• Call the dealership when the MIL is
illuminated to schedule time to repair
the vehicle. Lamp can remain active
after repair until system conrms
repair.
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