How to Use The Snap-On MODIS

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How to Use The Snap-On MODIS

By Mandy Concepcion

With the ever increasing electronic content in today’s vehicles, the scan tool
has become the tool of choice to look into the ECM or module functions. The
scanner is the only window into what the different modules are doing. One
thing’s to use an oscilloscope or GMM, but to know what the computer is
actually interpreting, your only choice is this piece of equipment.

This book is different than other book on the MODIS. This book actually
teaches you how to use the equipment and interpret the PID datastream. This
book also borrows from some of our other publications, but geared towards the
Modis. We also expose the use of other diagnostic equipment and how to use
them together. In today’s automotive repair shop the technician has to be able
to use the equipment and draw relational characteristics between the signal.
It is from these relations that the tech arrives to the true repair. It’s not
just using the Modis. It’s using the Modis and see if the scope and multi-
meter readings also support the repair conclusion.

Snap-On has over the years developed into a leader in diagnostic equipment.
With that in mind, lets learn to use the MODIS to its fullest and become a
profitable, top technician. Remember, learning to use your equipment will also
teach you a great deal of diagnostics.

About ASE Certification

We at Automotive Diagnostics and Publishing promote the ASE Certification
program and encourage all beginning and advanced technicians alike to
participate and get certified. We are not directly affiliated with ASE. ASE
Automotive Technician Certifications are recognized throughout the United
States by almost all county and state agencies as meeting the requirements to
be considered an automotive technician. Many organizations and repair
facilities nationwide have ASE Certification as mandatory for their
technicians as part of their business model.

It’s one thing to just show up for work; it is quite another to take control
of your career, and get recognition for the knowledge and skills you’ve
developed over the years. That’s what ASE certification is all about: helping
you tell customers, employers, and other people about what you know. After
all, being an automotive technician is not just turning wrenches. Your years
of hard work show that you’ve gone the extra mile, and put in the time and
effort to learn your trade. Your ASE certification patch is proof of it. Get
certified now."

We are not directly affiliated with ASE. The Tech-2 is a registered trademark
of Vetronix Corp. and GM The DRB III & Starscan are a registered trademark of
DaimlerChrysler The NGS is a registered trademark of Ford Motor Co. Any other
proprietary name used in this book was done purely for explanatory purposes.

Table of Contents

Basic Features

Modular Diagnostic System

BUTTON ARRANGEMENT DESCRIPTION

UPDATING THE MODIS SCANNER

GRAPHING THE PIDs

SAVING YOUR SCREEN SNAP-SHOTS AND BULDING YOUR OWN LIBRARY

A WORD ABOUT THE BATTERY CARE and MAINTENANCE

GENERAL SCANNER FUNCTION & PID ANALYSIS

THEORY OF OPERATION BEHIND THE DIFFERENT PARAMETERS (PIDs)

OBD I and OBD II, and general PID analysis

FUEL DELIVERY FAULT DETECTION

TEST 1 – Misfire detection strategy (EGR, ignition and mechanical misfires)

TEST 2 – A/F RATIO FAULTS

TEST 3 – CLOGGED EXHAUST

The MODIS Troubleshooter

GRAPHING THE PIDs

THE SNAP-SHOT FEATURE

OBD-2 Operability

Using the MODIS in conjunction with other types of equipment (Test-Light, Amp-
Probes, GMM, DVOM, Oscilloscope)

Last update

Feb. 15, 2013

How to Use The Snap-On MODIS

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