December 2021 - 70

Solve driveability issues
with fuel trim diagnostics
Fuel trim is an indicating metric that can shed light on how hard the
engine controller is working to achieve its desired air-to-fuel ratio.
By Scott Brown, Technical Editor
F
uel trim is a vital data point
technicians can leverage
when assessing vehicle
anomalies related to driveability
and emissions challenges.
Fuel trim (also known as additive,
block learn, integrator, or
multiplicative) is the correction
factor applied to the air-fuel
mass delivered to the cylinder
during engine operation. Small
errors in this cylinder air/fuel
http://www.VehicleServicePros.com

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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