December 2021 - 73

FOR MORE INFORMATION ON THESE PRODUCTS,
CLICK ON " PTEN E-INQUIRY "
at VehicleServicePros.com
OR CIRCLE THE NUMBER ON THE CARD.
RELATED PRODUCTS
REPAIR DATA
INTEGRATED SOFTWARE
NOW AVAILABLE
THROUGH MAXISYS
Bosch
ADS 625X Diagnostic
Scan Tool
DIAGNOSE
COMPLETE
THE REPAIR
THE ISSUE
Launch Tech USA
X-431 Turbo
dicting cylinder air during engine operation
for most manufacturers. However,
there are some today using other methods
such as neural networks to build artificial
intelligence with great success.
FUEL TRIM DIAGNOSTICS
Fuel trim is a key indicator of how well the
overall engine performance and fuel delivery
systems are performing. For service
technicians, it can provide an invaluable
path towards a resolution. As mentioned
earlier, it usually takes a wild swing in fuel
trim to flag a fault and therefore fuel trim
can be used to identify trouble before it
flips on the malfunction indicator lamp
(MIL). It's always a good practice to monitor
fuel trim along with a few other parameters
when assessing engine performance
issues. Knowing what can drive fuel trim
numbers can help technicians arrive at
the right hypothesis and therefore issue
the proper repairs that generate success.
Looking at Figure 1, you can see in the
lower graph that >20 percent fuel is being
removed via long-term fuel trim (LTFT)
on both banks. This vehicle is a flex fuel
vehicle and the revealing factor here is that
while the engine control module (ECM)
was targeting EQ or Lambda 1, the commanded
air-to-fuel ratio at 11.63:1. This
means that the ECM had inferred the
composition of the fuel to have roughly
52 percent ethanol. The other anomaly
here is that the mass air flow signal is over
reporting air flow.
Monitoring and recording engine performance
parameters can produce great reference
material for diagnosticians. Having a
deeper understanding of the inner workings
of the ECM and its various strategies
will no-doubt bear success when dealing
with engine performance and emissions
related challenges.
SCOTT BROWN is an ASE
Master Certified L1 Technician
and has over 37 years of
professional service industry
experience. He is the founder
of the Diagnostic Network.
sbrown@vehicleservicepros.com
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73
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December 2021

Table of Contents for the Digital Edition of December 2021

Editor's Note
New Products
Diagnostic Process
The human side of assistance-guided repairs
How to combat electrical issues on modern trucks
Data from another angle
How sensors impact heavy duty scan tools
Mining for the right data
Diagnostic products
AAPEX/SEMA Editor's Picks
Top 100 Products
Best Young Tech
Tool Briefing
Diagnostic Tech
Tool Reviews
Category Spotlight
Big-Time Boxes
December 2021 - 1
December 2021 - 2
December 2021 - 3
December 2021 - 4
December 2021 - 5
December 2021 - 6
December 2021 - 7
December 2021 - Editor's Note
December 2021 - 9
December 2021 - New Products
December 2021 - 11
December 2021 - 12
December 2021 - 13
December 2021 - 14
December 2021 - 15
December 2021 - 16
December 2021 - 17
December 2021 - 18
December 2021 - RSC1
December 2021 - RSC2
December 2021 - 19
December 2021 - 20
December 2021 - 21
December 2021 - 22
December 2021 - 23
December 2021 - 24
December 2021 - Diagnostic Process
December 2021 - 26
December 2021 - 27
December 2021 - 28
December 2021 - 29
December 2021 - The human side of assistance-guided repairs
December 2021 - 31
December 2021 - How to combat electrical issues on modern trucks
December 2021 - 33
December 2021 - 34
December 2021 - 35
December 2021 - Data from another angle
December 2021 - 37
December 2021 - 38
December 2021 - 39
December 2021 - 40
December 2021 - 41
December 2021 - How sensors impact heavy duty scan tools
December 2021 - 43
December 2021 - 44
December 2021 - 45
December 2021 - Mining for the right data
December 2021 - 47
December 2021 - Diagnostic products
December 2021 - 49
December 2021 - 50
December 2021 - 51
December 2021 - 52
December 2021 - 53
December 2021 - 54
December 2021 - 55
December 2021 - AAPEX/SEMA Editor's Picks
December 2021 - 57
December 2021 - Top 100 Products
December 2021 - 59
December 2021 - 60
December 2021 - 61
December 2021 - 62
December 2021 - 63
December 2021 - Best Young Tech
December 2021 - 65
December 2021 - Tool Briefing
December 2021 - 67
December 2021 - 68
December 2021 - 69
December 2021 - Diagnostic Tech
December 2021 - 71
December 2021 - 72
December 2021 - 73
December 2021 - Tool Reviews
December 2021 - 75
December 2021 - 76
December 2021 - 77
December 2021 - Category Spotlight
December 2021 - 79
December 2021 - 80
December 2021 - 81
December 2021 - Big-Time Boxes
December 2021 - 83
December 2021 - 84
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