SECTION 3 – INSTRUMENTS, INDICATORS, AND SWITCHES
High Exhaust System Temp eratu re (HEST) Lamp
Figure 16 HEST lamp
WARNING: Exhaust components are operating under
normal conditions and exhaust gases are at extremely high
temperatures. When stationary, keep away from people
and flammable materials, vapors, or structures or stop the
engine.
HEST lamp will illuminate when the exha u st syste m is h ot an d
regeneration is in progress. For additional information see the
applicable Vehicle Operator Manual.
Diesel Particulate Filter (DPF) Indicator
Figure 17 DPF indicator
The DPF indicator operates at three different levels.
Level One
• The DPF indicator will illuminate solid a nd rema in on
when the levels of soot exceed acceptable levels. The
regeneration process should begin by using either of the
following two methods. The lamp will turn off when the
regeneration process is complete.
• The vehicle can be safely driven on the highway at
highway speeds while the regeneration process is in
operation.
• The vehicle should be parked in a safe location and
start the Parked Regeneration process to prevent loss
of power.
Form No. 1172040R1
Page 40
Printed in the United States of America
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