OBD2
Diagnostics and Repair Strategies book on PDF
A complete OBD2 Diagnostics
and repair strategies book covering all 1996 to present automotive diagnostics
second generation or OBD2. Learn how to approach the auto repair from a DTC or
codes, pending, freeze-frames, catalytic converter, misfire, sensor, actuator,
comprehensive and O2 sensor monitors. See how to baseline the system. A must
read for anyone involved in Emission Smog Test State Inspections.
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About this book
In the early part of
the 21st century, we find our lives intertwined with a maze of technological
wonders. From cell-phones to personal computers, no human being today can
escape it. Automobiles are no exception to this rule.
With the ever
changing emission laws of today, the one constant in the automotive industry is
that things always change and will continue to do so. OBD II was designed from
the beginning to do so as well. Late model vehicle systems are much more
demanding, in both the amount of technology they posses and in the knowledge necessary
to repair them. This work was designed to just that, a step-by step diagnostic
approach to OBD II systems. It is also written with the State Inspections in
mind. This is in direct response to the increasing adoption of OBD II
inspections by most States throughout the country. OBD II repair don’t have to
be difficult or cumbersome and knowledge is the key to successful OBD II
diagnostics and repair.
TABLE OF CONTENTS
Section 1
- Basics of OBD II
- What is OBD II?
- Why do we need
it? The Federal Test Procedure (FTP)
- Technical aspects
of OBD II. (FF, Monitors, Pending & Current Codes, The Drive Cycle,
Re-setting Monitors, etc)
- The data link
connector
- Diagnostic
Trouble Code implementation
- Resetting Monitors
- What are Freeze
Frames and how are they useful in diagnostics
- A word about
misfires
- Do I need an OEM
scanner or can I get by with an aftermarket scan tool?
- Generic vs.
Enhanced. What's the difference? why do you need to pull-out both codes?
- The vehicle
failed OBD II-State Inspection, but is passing a 5 gas emissions test. Why is
it?
- Resetting fuel
trims. It’s not the same procedure for every system
- The Diagnostic
Executive or Task Manager. What is it?
- Bi-Directional
control capabilities are revolutionizing the diagnostic process
- Diagnosing EVAP
leaks. It doesn’t have to be complicated
Section 2
- Base-lining the
system includes retrieving FF, codes, & monitor status
- Freeze Frames
information gathering
- Monitor status
flag
- Code Setting Criteria.
How and why was the code set?
- Freeze Frame and
Code Setting Criteria comparison
- Dividing the
diagnostic process into systems and using the codes to detect system faults
- First rule of
diagnostics—Know the system you’re working on
- System by System
outlook
- Which Monitors
are Incomplete. The need to prove each system without having to run a drive
cycle by using the scanner, saving time & money
- General Idle PID
Snap-Shot
Section 3
- INTRODUCTION
- OBD-2 Generic PID
list
- OBD I and OBD II,
and general PID analysis
- FUEL DELIVERY
FAULT DETECTION
- TEST # 1
- TEST #2
- TEST #3
- TEST #4
- TEST #5
- RUNNING THE
MONITORS IN YOUR MIND USING THE SCANNER
Section 4
- Putting it all
together.
- Principles of
diagnostics
- Basic Scope
Testing and Bi-Directional Control
- No-Start, General
Diagnostics
- The correct
decision making process to a sound repair
- Don't assume
anything or get caught in a particular mind set
- Taking all the
facts into account
copyright
Mandy Concepcion, Automotive Diagnostics & Publishing