Automotive Scan Tool PID Diagnostics

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About the author:
Mandy Concepcion has worked in the automotive field for over 21 years. He holds an Associates Degree in Applied Electronics Engineering as well as an ASE L1 certification.

For the past 12 years he has been exclusively involved in the diagnosis of all the different electronic systems found in today's vehicles. It is here where he draws extensive practical knowledge from his experience and hopes to convey it in this book. The author is also president of Automotive Diagnostics and Publishing. He develops automotive DVD-Videos, writes auto repair and diagnostic books and develops auto repair software. He also designs the company's scan-tools, oscilloscope and
other diagnostic equipment.

Automotive Scan Tool PID Diagnostics
 

Diagnostic Strategies of Modern Automotive Systems

Authored by Mandy Concepcion

Automotive Scan Tool PID Diagnostics
(Diagnostics Strategies of Modern Automotive Systems )
By Mandy Concepcion

In this section, the different techniques of scan tool parameter (PID) analysis will be exposed. Techniques involving PID analysis are quickly catching on, due to their speed and accuracy. By properly analyzing the different scanner PIDs, the technician can arrive at the source of the problem much faster and accurately. These procedures give rise to the new term "driver seat diagnostics", since most of the preliminary diagnostic work is done through the scanner. However, these techniques will in no way replace the final manual tests that are a part of every diagnostic path. They are simply geared to point the technician in the right direction.

Table of Contents

INTRODUCTION (Introduction to scan tool diagnostics and the
relevance of using PIDs or scanner parameter to perform the first leg
of all diagnostics.)

- Theory of Operation Behind the Different PIDs (Describes CARB, the
difference between generic and enhanced PIDs, the FTP)

- OBD II Generic PIDs (PID calculated and actual values, calculated
data relationships, base injection timing, ECM value substitution)

- OBD I & II General PID analysis (erasing code-or not, recording,
analyzing and pinpoint tests, separating PIDs into groups)

- Fuel Delivery Fault Detection (fuel delivery issues, intake air temp.
sensor, BARO sensor, Engine LOAD, RPM PID, Short-Term Fuel Trims,
Long-Term Fuel Trims, 60% of check engine light issues, block
learn/integrators, Example 1: injector fault, Example 2: intake gasket
issues, fuel status, ignition timing, MAP/MAF, TPS, O2 sensor, IAC,
Closed Throttle, injector pulse width, voltage power, injector dutycycle,
fuel trim cell)

- Test #1 (Determining an engine's fuel Consumption (rich-lean
operation, duty-cycle to fuel trim relationship, O2 sensor to fuel trim
relation, FT and vacuum leaks, ignition timing and idle control, test
conclusion)

- Test # 2 (Misfire Detection Strategy, EGR, Ignition and Mechanical
misfires) (misfires and OBD2, scanner misfire detection - a time saver,
OBD2 40 and 80 cycle misfire, ignition, injector and EGR density
misfire, coil-on-plug, misfires and O2 sensor, lean O2 & Secondary
misfire, O2 sensor & injector misfires, leaky injector, EGR and the
MAP, Type A, B, C misfires, test conclusion)

- Test # 3 (Air/Fuel Ratio Faults) (air-fuel imbalance, MAF and post O2
sensors, open-closed-loop, fuel enable, HC & CO relation to AF issues,
test conclusion)

- Test # 4 (BARO, MAP & MAF PID analysis) (MAP & valve timing
faults, ECM behavior, fuel delivery or duty cycle test, volumetric
efficiency, , test conclusion)

- Test # 5 (Clogged exhaust) (clogged catalytic converter detection,
TPS, MAF and converters, idle and WOT or wide open throttle values,
vacuum readings, MAP to WOT chats analysis, engine and MAP
vacuum, test conclusion)

- Test # 6 (EGR Fault Detection) (EGR and MAP values, ECM reaction
to EGR issues, EGR temp sensor, DPFE sensor, EGR and O2-MAP and
lift position sensor, EGR and engine pre-loading, EGR and the ECM
erroneous high LOAD issues, test conclusion)

- Test # 7 (O2 Sensor Heater) (O2 heaters and why?, tough to check
O2 heater issues, O2 heater effect on signal output, O2 heater bias
voltage, engine off and O2 changing value, test conclusion)

- Test # 8 (Resetting Fuel Trims) (resetting injection pulse corrections,
long-term and short-term fuel trims, learn condition, Lambda, case
study on fuel trims, FT resetting according to manufacturer, test
conclusion)

- Test # 9 (Engine Cranking Vacuum Test) (MAP/MAF cranking
vacuum, vacuum to PID analysis, vacuum leaks, gauge-PID test,
sources of leaks, cranking values, test conclusion)


Publication Date:
2011-10-06
ISBN/EAN13:
1466386959 / 9781466386952
Page Count:
62
Binding Type:
US Trade Paper
Trim Size:
8.5" x 11"
Language:
English
Color:
Black and White
Related Categories:
Transportation / Automotive / Repair & Maintenance




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