Professional_Tool_And_Equipment_News_October_2019 - 74
is running at a high rate
* Throttle position: used to adjust
the output for engine speed
* Cooling fan speed: used to adjust
the output for greater load when
fans are on
* Engine coolant sensor: used to
adjust the output for changing
engine temperatures
Once you have this information,
scan the system for codes. Pay particular attention to any "U" codes. These
codes mean there is a lack of communication between modules in the CAN
bus and should always be addressed first.
Next, look for any codes in the PIDS the
PCM uses to adjust charging system
output as these can affect the charging
system's operation.
Next, look to see if there are any codes
in the charging system itself. Most vehicles now monitor the charging system
and are very good about setting codes
when there is an issue. It also is a good
idea to check the BCM for any codes just
to make sure none of your high electrical
demand components, such as rear window defrosters, have any problems.
Once the codes have been checked
and addressed, connect an amp clamp
to the battery, then use your scan tool to
command the charging system to charge
at its maximum rate while monitoring
the voltage and amperage. The output
voltage and amperage must be within
p A Delphi scan tool screenshot showing available charging system PIDS.
the specifications listed in your information database. If there are no codes
present, your scan tool is commanding
the system to charge at its maximum rate
and the PCM is seeing the command to
charge, that the wiring connections are
good, and that the belt is not slipping,
meaning most likely the alternator is at
fault. Remember there are exceptions to
every rule...
CASE STUDY: 2012 HONDA
ACCORD, INTERMITTENT
CHARGING SYSTEM FAILURE
This vehicle came in with an intermittent issue where the charging system
p A Mitchell 1 image showing the wiring diagram for the Honda ELD.
74
PTEN
OCTOBER 2019
www.VehicleServicePros.com
would have low output and the headlamps would flicker. When we got the
vehicle, there were no codes present and
the system was functioning properly following all of the test protocols outlined
by Mitchell 1. Looking further into
the system description, Honda uses an
Electronic Load Detector (ELD). The
ELD is a relay type of device located in
the underhood relay/fuse center. The
ELD is used to send a signal based on
voltage demand to the PCM, where the
PCM then turns on or off the charging
system to meet the demand.
At this time, there were no issues
with the charging system, and there
http://www.VehicleServicePros.com
Professional_Tool_And_Equipment_News_October_2019
Table of Contents for the Digital Edition of Professional_Tool_And_Equipment_News_October_2019
Editor's Note
Featured New Products
People's Choice Winners
Tool Briefing
Tool Reviews
Diagnostic Discourse
Category Spotlight
Marketplace
Big-Time Boxes
Professional_Tool_And_Equipment_News_October_2019 - 1
Professional_Tool_And_Equipment_News_October_2019 - 2
Professional_Tool_And_Equipment_News_October_2019 - 3
Professional_Tool_And_Equipment_News_October_2019 - 4
Professional_Tool_And_Equipment_News_October_2019 - 5
Professional_Tool_And_Equipment_News_October_2019 - 6
Professional_Tool_And_Equipment_News_October_2019 - 7
Professional_Tool_And_Equipment_News_October_2019 - Editor's Note
Professional_Tool_And_Equipment_News_October_2019 - 9
Professional_Tool_And_Equipment_News_October_2019 - 10
Professional_Tool_And_Equipment_News_October_2019 - 11
Professional_Tool_And_Equipment_News_October_2019 - Featured New Products
Professional_Tool_And_Equipment_News_October_2019 - 13
Professional_Tool_And_Equipment_News_October_2019 - 14
Professional_Tool_And_Equipment_News_October_2019 - 15
Professional_Tool_And_Equipment_News_October_2019 - 16
Professional_Tool_And_Equipment_News_October_2019 - 17
Professional_Tool_And_Equipment_News_October_2019 - 18
Professional_Tool_And_Equipment_News_October_2019 - 19
Professional_Tool_And_Equipment_News_October_2019 - 20
Professional_Tool_And_Equipment_News_October_2019 - 21
Professional_Tool_And_Equipment_News_October_2019 - 22
Professional_Tool_And_Equipment_News_October_2019 - 23
Professional_Tool_And_Equipment_News_October_2019 - 24
Professional_Tool_And_Equipment_News_October_2019 - 25
Professional_Tool_And_Equipment_News_October_2019 - 26
Professional_Tool_And_Equipment_News_October_2019 - 27
Professional_Tool_And_Equipment_News_October_2019 - 28
Professional_Tool_And_Equipment_News_October_2019 - 29
Professional_Tool_And_Equipment_News_October_2019 - 30
Professional_Tool_And_Equipment_News_October_2019 - 31
Professional_Tool_And_Equipment_News_October_2019 - 32
Professional_Tool_And_Equipment_News_October_2019 - 33
Professional_Tool_And_Equipment_News_October_2019 - 34
Professional_Tool_And_Equipment_News_October_2019 - RSC1
Professional_Tool_And_Equipment_News_October_2019 - RSC2
Professional_Tool_And_Equipment_News_October_2019 - 35
Professional_Tool_And_Equipment_News_October_2019 - 36
Professional_Tool_And_Equipment_News_October_2019 - 37
Professional_Tool_And_Equipment_News_October_2019 - 38
Professional_Tool_And_Equipment_News_October_2019 - 39
Professional_Tool_And_Equipment_News_October_2019 - 40
Professional_Tool_And_Equipment_News_October_2019 - 41
Professional_Tool_And_Equipment_News_October_2019 - 42
Professional_Tool_And_Equipment_News_October_2019 - 43
Professional_Tool_And_Equipment_News_October_2019 - 44
Professional_Tool_And_Equipment_News_October_2019 - 45
Professional_Tool_And_Equipment_News_October_2019 - 46
Professional_Tool_And_Equipment_News_October_2019 - 47
Professional_Tool_And_Equipment_News_October_2019 - 48
Professional_Tool_And_Equipment_News_October_2019 - 49
Professional_Tool_And_Equipment_News_October_2019 - 50
Professional_Tool_And_Equipment_News_October_2019 - 51
Professional_Tool_And_Equipment_News_October_2019 - 52
Professional_Tool_And_Equipment_News_October_2019 - 53
Professional_Tool_And_Equipment_News_October_2019 - 54
Professional_Tool_And_Equipment_News_October_2019 - 55
Professional_Tool_And_Equipment_News_October_2019 - 56
Professional_Tool_And_Equipment_News_October_2019 - 57
Professional_Tool_And_Equipment_News_October_2019 - 58
Professional_Tool_And_Equipment_News_October_2019 - 59
Professional_Tool_And_Equipment_News_October_2019 - 60
Professional_Tool_And_Equipment_News_October_2019 - 61
Professional_Tool_And_Equipment_News_October_2019 - 62
Professional_Tool_And_Equipment_News_October_2019 - 63
Professional_Tool_And_Equipment_News_October_2019 - 64
Professional_Tool_And_Equipment_News_October_2019 - 65
Professional_Tool_And_Equipment_News_October_2019 - People's Choice Winners
Professional_Tool_And_Equipment_News_October_2019 - 67
Professional_Tool_And_Equipment_News_October_2019 - 68
Professional_Tool_And_Equipment_News_October_2019 - 69
Professional_Tool_And_Equipment_News_October_2019 - 70
Professional_Tool_And_Equipment_News_October_2019 - 71
Professional_Tool_And_Equipment_News_October_2019 - Tool Briefing
Professional_Tool_And_Equipment_News_October_2019 - 73
Professional_Tool_And_Equipment_News_October_2019 - 74
Professional_Tool_And_Equipment_News_October_2019 - 75
Professional_Tool_And_Equipment_News_October_2019 - Tool Reviews
Professional_Tool_And_Equipment_News_October_2019 - 77
Professional_Tool_And_Equipment_News_October_2019 - 78
Professional_Tool_And_Equipment_News_October_2019 - 79
Professional_Tool_And_Equipment_News_October_2019 - 80
Professional_Tool_And_Equipment_News_October_2019 - 81
Professional_Tool_And_Equipment_News_October_2019 - Diagnostic Discourse
Professional_Tool_And_Equipment_News_October_2019 - 83
Professional_Tool_And_Equipment_News_October_2019 - 84
Professional_Tool_And_Equipment_News_October_2019 - 85
Professional_Tool_And_Equipment_News_October_2019 - Category Spotlight
Professional_Tool_And_Equipment_News_October_2019 - 87
Professional_Tool_And_Equipment_News_October_2019 - 88
Professional_Tool_And_Equipment_News_October_2019 - 89
Professional_Tool_And_Equipment_News_October_2019 - 90
Professional_Tool_And_Equipment_News_October_2019 - 91
Professional_Tool_And_Equipment_News_October_2019 - 92
Professional_Tool_And_Equipment_News_October_2019 - 93
Professional_Tool_And_Equipment_News_October_2019 - 94
Professional_Tool_And_Equipment_News_October_2019 - 95
Professional_Tool_And_Equipment_News_October_2019 - Marketplace
Professional_Tool_And_Equipment_News_October_2019 - 97
Professional_Tool_And_Equipment_News_October_2019 - Big-Time Boxes
Professional_Tool_And_Equipment_News_October_2019 - 99
Professional_Tool_And_Equipment_News_October_2019 - 100
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