december2023 - 35

placed the vehicle back into service where it is currently
operating properly. What we learned here is that although
you may have a gross error (multiple defective coils), a
diagnostic technician should always remain curious and
perform a final road test evaluation while recording the
proper key performance indicators. Now if we had good
airflow numbers with a lean exhaust, then we would proceed
to investigate the fuel supply side of the vehicle.
Looking back on my two images (Figures 8 & 9) you can
see the 3-dimensional graph in the lower right of the screen.
This graph is configured to show an averaged value of long-term
fuel trim (LTFT) over an RPM/cylinder airmass table. Some
scan tools allow you to configure tables like this which can be
useful for visualizing data. In fact, looking back on Figure 2,
this table was used to monitor boost on a turbocharged vehicle
that was suspected of having an intermittent leaking wastegate
valve. This chart takes advantage of a math PID that automatically
finds the difference between actual and desired boost.
CONCLUSION
Modern driveability diagnosticians not only rely heavily
on scan tools and OBD-II data to troubleshoot performance
issues effectively, but they must also possess the
inquisitiveness necessary to properly analyze and diagnose
these systems. They also need to have a heightened
level of situational awareness of the tools and equipment
available to take on these demanding tasks.
SCOTT BROWN is an ASE Master Certified L1
Technician and has over 37 years of professional
service industry experience. He is an independent
shop owner in Southern California and is engaged
at various levels within the industry. He has a
deep understanding of the challenges technicians experience at
the service level and is continuously striving to move the industry
forward through education and networking. Brown founded
Diagnostic Network after 22 years of service at iATN, where he
retired as company president in 2018.
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2309PTED_Clore Automotive.indd 1
8/18/23 11:10 AM
Professional Distributor I December 2023 I VehicleServicePros.com 35
Control Panel
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december2023

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