December 2023 - 17
p Figure 7 - Ford IDS TCC slip
Photo courtesy of Scott Brown
CASE STUDIES
CASE STUDY #1:
POOR PERFORMING FORD EDGE
Recently one of my technicians asked me for a second opinion
on a 2019 Ford Edge 2.0L he was addressing for a complaint
about poor performance. This was a new client and they stated
that the vehicle seemed to be misfiring and lacked smooth
acceleration. My tech stated that the only DTC stored in the
vehicle was related to the front shutters which he didn't think
were related to the performance problem. He also stated that
there was no misfire history statistical data reported in Mode
$06. So, I decided to grab one of my go-to devices and record
some data while performing a road test. Sure enough, I felt
the condition and it sure felt as if the engine was misfiring
under light load conditions. During the
road test and while I was recording, I
proceeded to perform a wide-open
throttle (WOT) sweep up through
a shift point. I normally do this for
most driveability analysis events so I
can gauge the performance of certain
systems. What I noticed is that during
the WOT event, the vehicle performed
properly with great acceleration.
When I returned to the shop, I proceeded
to perform a data review. The
first thing I noticed was that the normal
data metrics such as fuel trim, spark
advance, and temperatures, looked very
2312PTEN_Steel Blue Boots.indd 1
normal and that I could see a distinctive change in engine speed
during the light load misfire symptom. While reviewing the
recorded data, I decided to match up the vehicle speed sensor
(VSS) signal with the engine speed (RPM) by adjusting the
MIN/MAX ranges of their respective axes to see if I could
visualize what I suspected.
As you can see in Figure 5, the RPM trace is unsteady as
opposed to the VSS signal which is indicative of torque converter
clutch slippage since the RPM signal isn't dropping
significantly below the vehicle speed slope.
Looking further, you can see in the recording, that during
the first and second gear operation, each RPM slope was
smooth. When I entered the third and fourth gear, the vehicle
exhibited the symptoms the client was complaining about.
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www.VehicleServicePros.com DECEMBER 2023 PROFESSIONAL TOOL & EQUIPMENT NEWS 17
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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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