October_2021 - 42

TOOL BRIEFING
Diesel repair: A combination of service
information, tooling, and techniques
will net the best results
Three different case studies help illustrate the complexities of diesel systems.
By Christopher Groff, Contributing Editor
M
odern diesel engine
drivability diagnostics
and repairs aren't
exactly the easiest to deal with,
especially as systems continue
to increase in complexity.
Evaluating the training, information,
and tooling needs of your
shop, based on the vehicles you
service, will allow you and your
shop to best serve your customer
base. There are countless
compression, fuel, and sensor
testing tools available; not to
mention the multitude of specialty
timing and injector tools.
Taking a bit of time to analyze
your specific situation will get
you the best results.
CASE STUDY 1: 2021
FREIGHTLINER M2 - ABS LIGHT
ILLUMINATED
A fleet customer brought in this
Freightliner for routine preventive maintenance
and a check-over. The initial inspection
and health check showed that the ABS
light was illuminated on the dashboard;
our customary preliminary road test confirmed
that the ABS was not operating as
designed. A quick conversation with the
customer revealed that they had not mentioned
it as it was scheduled at the dealership
under warranty, unfortunately, the
dealer was backlogged for approximately
two months.
Upon receiving approval from the customer
to do some preliminary evaluation
of the fault I grabbed my go-to scanner
for HD - the TEXA Axone Nemo 1 -
and performed a full system scan (Figure
1). The results showed a high-resolution
wheel speed sensor (HRW) fault.
A quick evaluation of scan data showed
that the front right wheel speed sensor was
reading 161 mph (a default reading) whilst
parked. Attaching the waveform generator
from my Autel Ultra VCMI to the speed
sensor harness (using the AESWave uTest
42 PTEN OCTOBER 2021 www.VehicleServicePros.com
p Diesel engine.
terminal kit) and referencing service
information, from Mitchell ProDemand
Truck, allowed me to quickly verify the
integrity of the chassis side wiring as well
as the module. This combined with our
fault code and data stream allowed me
to quickly pinpoint a failed wheel speed
sensor as the fault. A thorough inspection
was performed of the hub assembly with
the aid of my Snap-on BK500 borescope
to rule out a mechanical failure leading

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October_2021

Table of Contents for the Digital Edition of October_2021

Editor's Note
New Products
Diagnostic Tech
Tool Briefing
Tool Reviews
People's Choice Winners
Category Spotlight
Bit-Time Boxes
October_2021 - 1
October_2021 - 2
October_2021 - 3
October_2021 - 4
October_2021 - 5
October_2021 - 6
October_2021 - 7
October_2021 - Editor's Note
October_2021 - 9
October_2021 - New Products
October_2021 - 11
October_2021 - 12
October_2021 - 13
October_2021 - 14
October_2021 - 15
October_2021 - 16
October_2021 - 17
October_2021 - 18
October_2021 - 19
October_2021 - 20
October_2021 - 21
October_2021 - 22
October_2021 - RSC1
October_2021 - RSC2
October_2021 - 23
October_2021 - 24
October_2021 - 25
October_2021 - 26
October_2021 - 27
October_2021 - 28
October_2021 - 29
October_2021 - 30
October_2021 - 31
October_2021 - 32
October_2021 - 33
October_2021 - 34
October_2021 - 35
October_2021 - 36
October_2021 - 37
October_2021 - Diagnostic Tech
October_2021 - 39
October_2021 - 40
October_2021 - 41
October_2021 - Tool Briefing
October_2021 - 43
October_2021 - 44
October_2021 - 45
October_2021 - 46
October_2021 - 47
October_2021 - Tool Reviews
October_2021 - 49
October_2021 - 50
October_2021 - 51
October_2021 - People's Choice Winners
October_2021 - 53
October_2021 - 54
October_2021 - 55
October_2021 - 56
October_2021 - 57
October_2021 - 58
October_2021 - 59
October_2021 - Category Spotlight
October_2021 - 61
October_2021 - 62
October_2021 - 63
October_2021 - 64
October_2021 - 65
October_2021 - 66
October_2021 - 67
October_2021 - 68
October_2021 - 69
October_2021 - 70
October_2021 - 71
October_2021 - 72
October_2021 - 73
October_2021 - Bit-Time Boxes
October_2021 - 75
October_2021 - 76
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