Table 10.
Lamp
Lamp Name
Description
Results
High Exhaust System
Temperature (HEST)
Lamp
Lamp is yellow.
Indicates exhaust
temperature is above
a preset limit and unit
is operating at low
vehicle speed (below
5 mph [8 kph]). When
the engine speed is
elevated for a parked
regeneration, lamp
will flash once every
10 seconds.
Vehicle can be
driven. Lamp solid for
an extended period
(Longer than 40
Minutes) - call for
service.
Lamp Solid
Lamp Flashing
• At the start of every ignition cycle (bulb
check).
• Vehicle speed is less than 5 mph and the
Diesel Particulate Filter (DPF) outlet
temperature is greater than 525° C (977°
F).
Flashes every 10 seconds when the
Selective Catalytic Reduction ( SCR
Catalyst) is not up to temperature
Malfunction Indicator Lamp
Table 11.
Lamp
Lamp Name
Description
Results
Malfunction Indicator
Lamp (MIL)
Yellow lamp Indicates
a failure of an
Emission Control
device. May
illuminate at the
same time as the
Amber Warning
Lamp.
Vehicle can be driven
to end of the shift.
Call for service.
Lamp Solid
Lamp Flashing
• At the start of every ignition cycle (a bulb
check)
• For any emission related fault (light out
when the fault is inactive)
Never flashes
Fuel Filter Restriction Sensor Lamp: Fuel Filter Failed
Instrument Panel Lamps
50
All information subject to change without notice.
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