february2022 - 16
» Aim technician John Norwood placed
first in the engine and aftertreatment
category at TMCSuperTech 2021.
Photo: Aim Nationalease
side, but should be black and relatively dry. This
is a good time for a technician to also look for
missing or damaged end plugs, as well as cracks
in the substrate.
Issues like this should be identified before a
technician forces a regen.
" Many technicians use a forced regen as their
first repair attempt when a fault code indicates
an issue with the ATS, " said Lee Lackey, product
manager with Noregon Systems, a provider of
diagnostic, repair, and data analytic solutions.
" But forcing a regen uses a considerable amount
of fuel, typically a gallon or more. Additionally,
forcing a regen causes undue stress to the
components, weakening them and shortening
their lifespan. "
Lackey said technicians should take the time to
utilize the troubleshooting functionality of their
diagnostic tool. " In JPRO, for example, we provide
a checklist of items to follow before starting aftertreatment
diagnostics. As a rule of thumb, focus
on issues upstream of the DPF that can lead to
contamination of the filter. This means diagnosing
any active engine faults before aftertreatment
faults, " Lackey advised.
" Depending on the fault codes, a regen might
be the answer 80% of the time, " added Chris
Freeman, director of sales/training HD at Autel,
a developer of diagnostics, detection, and analysis
systems. " But technicians must understand that
a regen is not the cure-all for DPF and ATS issues.
16 Fleet Maintenance | February 2022
" ...Forcing a regen uses a considerable
amount of fuel, typically a gallon or more.
Additionally, forcing a regen causes undue
stress to the components, weakening
them and shortening their lifespan. "
Lee Lackey, product manager, Noregon Systems
Technicians should read their troubleshooting
steps completely in order to identify the root cause
of a code or series of codes. "
Freeman recently assisted a customer with
an ATS-related issue that helps illustrate
his point. A Cummins engine had
gone into derate (codes 3712 and
3714). Freeman helped the technician
troubleshoot by process
of elimination.
" I knew this engine didn't
have issues with the EGR
valve, so I set that possibility
aside, " Freeman explained.
" A problem with the VGT
(variable geometry turbocharger)
actuator is it typically
throws its own code.
There wasn't a code, so I set
that aside. What's left? The DPF,
» The area highlighted in red is where
Volvo's diesel particulate filter resides.
Photo: Volvo Trucks North America
february2022
Table of Contents for the Digital Edition of february2022
Hitched Up: Planning for the shop of the future
Equipment: Innovation powers up modern CV batteries
In the Bay: Look upstream to reduce DPF downtime
Shop Operations: Best practices to clean and prevent shop spills
Under Vehicle: Pumping up TPMS and ATIS maintenance practices
Body & Cab: 'Maintenance-free' LED headlights still need TLC
Management: The pitfalls of promoting technicians to supervisors
Diagnostics: Climbing out of the diagnostic rabbit hole
Fleet Parts & Components
Tools & Equipment
Classifieds
Guest Editorial: Fractional air filter improvements make your fleet whole
february2022 - 1
february2022 - 2
february2022 - 3
february2022 - 4
february2022 - 5
february2022 - Hitched Up: Planning for the shop of the future
february2022 - 7
february2022 - Equipment: Innovation powers up modern CV batteries
february2022 - 9
february2022 - 10
february2022 - 11
february2022 - In the Bay: Look upstream to reduce DPF downtime
february2022 - 13
february2022 - 14
february2022 - 15
february2022 - 16
february2022 - 17
february2022 - 18
february2022 - 19
february2022 - 20
february2022 - 21
february2022 - Shop Operations: Best practices to clean and prevent shop spills
february2022 - 23
february2022 - 24
february2022 - 25
february2022 - 26
february2022 - 27
february2022 - 28
february2022 - 29
february2022 - Under Vehicle: Pumping up TPMS and ATIS maintenance practices
february2022 - 31
february2022 - 32
february2022 - 33
february2022 - 34
february2022 - 35
february2022 - Body & Cab: 'Maintenance-free' LED headlights still need TLC
february2022 - 37
february2022 - 38
february2022 - 39
february2022 - 40
february2022 - Management: The pitfalls of promoting technicians to supervisors
february2022 - Diagnostics: Climbing out of the diagnostic rabbit hole
february2022 - 43
february2022 - Fleet Parts & Components
february2022 - 45
february2022 - Tools & Equipment
february2022 - 47
february2022 - 48
february2022 - Classifieds
february2022 - Guest Editorial: Fractional air filter improvements make your fleet whole
february2022 - 51
february2022 - 52
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