October 2023 - 33
p Figure 1 - Wiring diagram, connector location
Photo from Tesla SI
Network basics: An understanding of the distinct types of
networks which each require a different approach. For this article,
we'll be focusing on HSCAN (high-speed controller area network)
which is typically operating at 500kbps, and we'll also briefly
discuss local interconnect network (LIN) which is a popular
choice for low-speed, non-mission critical communication due
to its low cost.
Electrical fundamentals: An understanding of ohms law, basic
circuits, power, ground, voltage drop, and the ability to understand
and decipher wiring diagrams and knowing where else to source
information to establish a sound understanding of the system
you're currently addressing.
Tool awareness: Understand how to assess a tool's strengths
and weaknesses and how to apply them to make the best use of
the tool when the time is right. Possessing basic DVOM skills
will go a long way toward helping the technician get on the right
track to success, especially regarding circuit resistance testing.
Diagnostic scenarios can be classified as either a hard fault
(good) or an intermittent fault (bad). We'll go over both.
For the most part, faults caused can be placed into three buckets:
* Connections
* Module failure
* External influence
Within these buckets, we can tie the following conditions to each.
p Figure 2 - Mercedes-Benz CAN junction points 2015 MY
Photo courtesy of Scott Brown
skills that will allow him or her to navigate complex vehicle systems
and drill down to locate and rectify trouble. In some cases,
the vehicle may have an intermittent network problem, and this is
where the job can become the most difficult and time consuming.
In my opinion, network communication faults will require the
technician to possess the following at minimum:
CONNECTIONS
Connectors are potential failure points and can serve as potential test
and isolation points. Connection problems can be caused by conditions
such as terminal fretting, or they could have been influenced
by previous service events or external influences such as moisture or
improper testing (otherwise known as maintenance-induced failure).
Accurate wiring diagrams and connector locator tools are essential
for proper troubleshooting (Figure 1).
www.VehicleServicePros.com OCTOBER 2023 PROFESSIONAL TOOL & EQUIPMENT NEWS 33
http://www.VehicleServicePros.com
October 2023
Table of Contents for the Digital Edition of October 2023
EDITOR'S NOTE
NEW PRODUCTS
PEOPLE’S CHOICE AWARD
BEST YOUNG TECH AWARD
DIAGNOSTIC TECH
TOOL BRIEFING
INNOVATION AWARD PROFILE
TOOL REVIEWS
CATEGORY SPOTLIGHT
BIG-TIME BOXES
October 2023 - 1
October 2023 - 2
October 2023 - 3
October 2023 - 4
October 2023 - 5
October 2023 - 6
October 2023 - 7
October 2023 - EDITOR'S NOTE
October 2023 - 9
October 2023 - NEW PRODUCTS
October 2023 - RSC1
October 2023 - RSC2
October 2023 - 11
October 2023 - 12
October 2023 - 13
October 2023 - 14
October 2023 - 15
October 2023 - 16
October 2023 - 17
October 2023 - PEOPLE’S CHOICE AWARD
October 2023 - 19
October 2023 - 20
October 2023 - 21
October 2023 - 22
October 2023 - 23
October 2023 - 24
October 2023 - 25
October 2023 - 26
October 2023 - 27
October 2023 - BEST YOUNG TECH AWARD
October 2023 - 29
October 2023 - 30
October 2023 - 31
October 2023 - DIAGNOSTIC TECH
October 2023 - 33
October 2023 - 34
October 2023 - 35
October 2023 - 36
October 2023 - 37
October 2023 - 38
October 2023 - 39
October 2023 - 40
October 2023 - 41
October 2023 - 42
October 2023 - 43
October 2023 - TOOL BRIEFING
October 2023 - 45
October 2023 - 46
October 2023 - 47
October 2023 - INNOVATION AWARD PROFILE
October 2023 - 49
October 2023 - TOOL REVIEWS
October 2023 - 51
October 2023 - 52
October 2023 - 53
October 2023 - CATEGORY SPOTLIGHT
October 2023 - 55
October 2023 - 56
October 2023 - 57
October 2023 - BIG-TIME BOXES
October 2023 - 59
October 2023 - 60
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