December 2023 - 32
TOOL BRIEFING
p Figure 4 - Ford diesel engine and batteries showing that a bad
battery or bad battery cable connections can cause strange problems.
Photo courtesy of Ross Colket
you drove the car normally it was fine. The
client had taken the vehicle to the dealer a
total of six times with them being unable
to duplicate the problem. The client finally
brought the vehicle to us.
We found that if you put all the heavy
loads on in the vehicle and let it just sit
and idle. The voltage would drop down
to 11.5V and the problem would occur.
It was easy to see because the windshield
wiper blades would turn on by themselves.
The network would go down and everything
would default to a safety mode. The
Challenger's network is only CAN, there
are no other networks on the vehicle, so
the entire car would crash. On this vehicle,
it ended up being the transmission
control module. We determined this by
connecting an oscilloscope to the network
and began disconnecting modules from
the bus bar until the network returned
to normal.
THE RIGHT TOOLS FOR THE JOB
When performing electrical system diagnostics,
know which tool is the right tool
for the type of diagnostics that you are
doing. A DVOM is not the right tool for
Circle 63 on card or click " PTEN e-inquiry " on
VehicleServicePros.com
2312PTEN_KillerTools.indd 1
32 PTEN DECEMBER 2023 www.VehicleServicePros.com
11/14/23 10:35 AM
performing network diagnostics. The
update rate is too slow for network diagnostics.
For example, a DVOM's update
rate is approximately 40 times a second
or every 25 milliseconds (Figure 5). In
the attached CAN signal, we can see we
are looking at approximately 50 milliseconds.
Our DVOM would sample that signal
twice in that time frame. Most meters
are average responding and will average
the upper and lower voltage levels. If the
meter samples CAN low both times at
2.5V it is going to read 2.5V on the display,
but if samples CAN low at 2.5V and
1.25V it is going to display 1.987V. Make
sure you choose the proper tool for the job
that you are working on.
ROSS COLKET is the
owner of Colket Automotive
Technical Services
in Lansdale, Pennsylvania.
He is an ASE Certified Master
Technician with over 30 years of experience
as both a technician and educator. As a
former CTI instructor, he believes in the
importance of training and giving back to the
industry. Ross fully supports and believes
in Motor Age's mission to " advance the
automotive professional. "
http://www.killertools.com
http://www.VehicleServicePros.com
http://www.VehicleServicePros.com
December 2023
Table of Contents for the Digital Edition of December 2023
EDITOR'S NOTE
NEW PRODUCTS
DIAGNOSTIC TECH
AAPEX/SEMA EDITOR’S PICKS
TOP 100 PRODUCTS
TOOL BRIEFING
TOOL REVIEWS
INNOVATION AWARDS PROFILE
CATEGORY SPOTLIGHT
BIG-TIME BOXES
A systematic approach to finding the right scan tool
Old tools, new tricks
Are you calibrating ADAS-equipped vehicles?
A step-by-step guide with expert insights on mastering ADAS tech recalibration
Diagnostic products
December 2023 - 1
December 2023 - 2
December 2023 - 3
December 2023 - 4
December 2023 - 5
December 2023 - 6
December 2023 - 7
December 2023 - EDITOR'S NOTE
December 2023 - 9
December 2023 - NEW PRODUCTS
December 2023 - RSC1
December 2023 - RSC2
December 2023 - 11
December 2023 - DIAGNOSTIC TECH
December 2023 - 13
December 2023 - 14
December 2023 - 15
December 2023 - 16
December 2023 - 17
December 2023 - 18
December 2023 - 19
December 2023 - AAPEX/SEMA EDITOR’S PICKS
December 2023 - 21
December 2023 - TOP 100 PRODUCTS
December 2023 - 23
December 2023 - 24
December 2023 - 25
December 2023 - 26
December 2023 - 27
December 2023 - TOOL BRIEFING
December 2023 - 29
December 2023 - 30
December 2023 - 31
December 2023 - 32
December 2023 - 33
December 2023 - TOOL REVIEWS
December 2023 - 35
December 2023 - 36
December 2023 - 37
December 2023 - INNOVATION AWARDS PROFILE
December 2023 - CATEGORY SPOTLIGHT
December 2023 - 40
December 2023 - 41
December 2023 - BIG-TIME BOXES
December 2023 - 43
December 2023 - 44
December 2023 - S1
December 2023 - S2
December 2023 - S3
December 2023 - A systematic approach to finding the right scan tool
December 2023 - S5
December 2023 - S6
December 2023 - S7
December 2023 - S8
December 2023 - S9
December 2023 - Old tools, new tricks
December 2023 - S11
December 2023 - S12
December 2023 - S13
December 2023 - Are you calibrating ADAS-equipped vehicles?
December 2023 - S15
December 2023 - S16
December 2023 - S17
December 2023 - A step-by-step guide with expert insights on mastering ADAS tech recalibration
December 2023 - S19
December 2023 - S20
December 2023 - Diagnostic products
December 2023 - S22
December 2023 - S23
December 2023 - S24
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