Paccar PX-9, Operator'S Manual

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(HEST), diesel particulate filter (DPF), and
Diesel Exhaust Fluid (DEF) warning lights.
NOTE
The Malfunction Indicator Light (MIL)
turns on if the on-board diagnostics
(OBD) system detects a possible
emissions system failure. To ensure
the condition is corrected, the vehicle
should be brought in for service at the
earliest opportunity.
Diesel Particulate Filter (DPF)
This warning means that the DPF needs to
be regenerated and will appear when soot
in the DPF exceeds an acceptable amount
or significant amounts of hydrocarbons
(HC) are detected.
DPF Warning Light States
State Condition and Actions
White
Soot is above the acceptable
amount.
The DPF can be regenerated.
Amber
Soot almost fills the DPF
OR
A significant amount of HC are
detected in the DPF.
The DPF should be regenerated to
prevent derate. If due to HC, warning
will be accompanied by a "DPF
Warmup" popup (see ).
Flashing
Amber
Soot has filled the DPF.
The EAS will now derate the engine.
1
A parked regeneration must be
performed (see ).
Flashing
Red
DPF is critically full.
State Condition and Actions
The EAS will further derate the
engine. 2 The DPF can no longer be
regenerated and must now be
removed and cleaned.
Each progressing stage is accompanied by
an audible alert and a popup notification.
Routine automatic regenerations are
usually sufficient to eliminate the
accumulated soot, but when the conditions
for an automatic regeneration cannot be
met, or there are high levels of soot in the
DPF, a parked regeneration might be
required (see Automatic Regeneration or
Parked Regeneration).
This warning may also appear if the
system is attempting to regenerate
automatically while the vehicle is in Power
Take-off (PTO) mode.
1
Emergency vehicles are exempt from this derate.
2
Emergency vehicles are exempt from this derate.
ENGINE OPERATION - Operating Instructions
Y53-1185-1J1 (10/21) 15
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