Table of Contents
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FOREWORD
This Instruction Manual fully describes the operation of the C.E.C. Fuel Feedback System Tester (ET-501);
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explaining its function of analyzing the output generated by the sensors which are part of the Com-
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puterized Emission Control (CEC) System on AMC and Jeep 6-cylinder and 4-cylinder engines manufac¬
tured from 1981 through 1984 with this system.
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Partitioned into five section^, this Instruction Manual is conveniently organized with handy divider tabs
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to insure the quick and easy locating of information.
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The General Information section highlights the Tester's description, design features, and replaceable
parts, as well as explaining the operation of the CEC Fuel Feedback System's open- and closed-loop
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modes. A listing of the definitions of the abbreviated response displays is also included to aid you. in
readily understanding them.
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Flow charts for both the ©-cylinder and 4-cylinder engines have been divided into their respective sections
in addition to a unit being devoted to diagnostic schematic drawings. In this section you'll find informa-
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tion on the new diagnostic connectors and microprocessing unit (MCU) pin connectors found, on our
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1983-1984 vehicles.
Throughout the various {low charts, we have made use of the following two symbols:
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>= greater than
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<= Less than.
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For example, the instructions;-''<1.5" should be understood to mean "folfow the-path marked '<1.5,' if -
the reading after the test is less than .1.5." For a reading g/eater than 1.5, you should follow the path
marked ">1.5."
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The fifth section, Bulletins; has-been set aside to assist you in keeping this Instruction Manual current.
Any information subsequently issued by AMC/Je'ep Or the Tester's manufacturer should be placed in this
section, Be sure to either remove out-dated information or mark the-revisions and their effective dates on
any information which remains jn thiS'manuart.
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Use of the information contained in this Instruction Manual will enable you to professionally service the
CEC Fuel Feedback System with the ET-501 Tester. Any questions regarding information not covered
here should be submitted to yoUr 2fone'bffice or to.the Tester's manufacturer. -
NOTE: The material contained in ihis -editjon of the CEC Fuel Feedback System Tester Instruction
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Manual supersedes any and allpre.ViQuSly released Instruction Manuals..
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