MAC TOOLS EM721 - Introduction and Overview; Warranty and Limitation of Liability

MACTOOLS.COM
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WARRANTY
This instrument is warranted to be free from defects in material and workmanship for a period of one
year. Our obligation to the original purchaser shall be limited to repairing or replacing, at our expense (not
including shipping charges) a defective tool if returned by the original purchaser within one year from the
date of purchase, all incoming shipping charges prepaid. THIS WARRANTY DOES NOT COVER DEFECTS
OR DAMAGES TO THE TOOL (i) after the warranty period expires; (ii) resulting from misuse or abnormal
operation; (iii) resulting from a failure to properly maintain or operate the tool; or (iv) resulting from any repair
or maintenance services performed by any party other than Mac Tools. This warranty does not cover expandable
items such as batteries and/or fuses.
LIMITATION OF LIABILITY
This manual tells you how to use the meter to perform diagnostic tests and to nd possible locations of
automotive electronic problems. It does not tell you how to correct the problems. Once you have located a
problem, consult your car’s service manual or other manuals to provide specic information needed for repair.
All information, illustrations, and specications contained in this manual are based on the latest information
available at the time of publication. The right is reserved to make changes at any time without notice.
TABLE OF CONTENTS
1. Safety Information .............................................................................. 4
2. Introduction ....................................................................................... 7
3. Front panel ........................................................................................ 8
4. Understanding the Display ................................................................ 14
5. Basic Electrical Tests and Measurements ........................................... 17
6. Basic Automotive Measurements ........................................................ 26
7. Basic Automotive Diagnostic Testing .................................................. 33
8. Basic Automotive Component Testing ................................................. 58
9. Summary of Automotive Electrical System Tests .................................. 67
10. Specications .................................................................................. 70
11. General Specications ..................................................................... 75
12. Maintenance .................................................................................... 76
13. Meter-PC Communication Software Instruction .................................... 77