october2022 - 25

then we're able to present back to customers
through Elevāt on a statistical root cause probability, "
he said. " It could be that based on this
condition, we think 85% of the time it is the
turbo, or NOx sensor, or DEF quality sensor-or
it could be that it is a non-Cummins part. "
Copeland said it is important to know the duty
cycle, monitor individual vehicles, and follow
the maintenance guidelines.
Understanding most
of this within a Detroit
engine can be accomplished
through Detroit Connect and
Virtual Technician. " Virtual
Technician will notify a fleet
of faults that occur at different
levels of importance.
Some codes are information
only, some are meant
to be addressed at the next
scheduled maintenance, and
others require immediate
attention, " he said.
As a best practice, Hed -
man recommends that
when ever a fleet vehicle
is in the shop, planned or
unplanned,
technicians
thoroughly scan the entire
vehicle to get ahead of any
aftertreatment issues that
may not yet be obvious to
the driver. He said fleets
need to pay close attention
to inactive faults on the
entire DPF system. " Inactive
faults with counts higher
than ten are commonly
considered active by the
OE's standards and, as a
rule, should be treated and
repaired as such. "
An example of that
is
a DEF pump issue. " If the
pump is faulting when a
passive regen is attempting
to start or is in the process of
running, it can cause it not to
start or can make the regen
ineffective, " Hedman said.
" Another example is an intermittent
DPF sensor pressure
fault. The same type of thing
can happen here if wiring is
damaged or the connectors
are faulty. The system won't
let the regen start, or it will
stop it in process. "
Freeman noted systems
have two NOx sensors, a
DEF-level sensor, a DEF quality
sensor, and DEF temperature
sensors. " Usually, codes
will be down to those five
sensors, " he said, adding
that
DEF
temperature
sensors have been an issue
because parts are on national
backorder.
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Communication between drivers, fleets, and
technicians can help technicians diagnose the
problem. " When a truck enters the workshop
with an aftertreatment issue, the operator should
be interviewed to understand the truck's usage
and whether the operator follows best practices, "
Bressler suggested. " This should be done before
significant diagnostic work is performed. "
Preventing issues
General maintenance habits, such as fuel filter
and air filter maintenance, help minimize aftertreatment
issues. Mustafa recommended fleets
establish service intervals for key ATS components
such as the fuel doser, DEF doser, and DEF
filter replacement. In addition, the DPF should be
cleaned on a regular interval rather than relying
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october2022

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