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The purpose of this manual is to provide Peterbilt with the knowledge required to
produce their own repair procedures. This manual contains the technical repair informa-
tion necessary to diagnose and repair the Model 387 Instrument System (also referred
to as simply the "instrumentation"). The information in this manual is not propri-
etary and can be used as Peterbilt sees fit.
The manual describes how to operate, service, and troubleshoot the instrumentation
installed in vehicles that broadcast engine- and speed-related information over a
public data bus (the SAE J1708 data bus). For information about the vehicle's Electronic
Control Unit(s), wiring diagrams, the SAE J1708 data bus, external sensors and other
components that are not part of the instrumentation, please refer to the appropriate
vehicle service documentation.
The manual is divided into six chapters:
•
Introduction - Contains a brief introduction to the product and to the
manual itself.
•
Operation - A complete operator's manual. Written for the vehicle opera-
tor, this chapter describes how to use the instrumentation and how to in-
terpret the information it presents. If you are going to operate the vehicle,
you should read and understand the information in this chapter.
•
Functional Description - Describes the components that make up the in-
strumentation and how they communicate with other systems in the vehi-
cle. An understanding of the information in this chapter will help you
diagnose and find problems in the instrumentation. If you are going to ser-
vice the instrumentation, you should read and understand the information
in this chapter.
•
Service - Describes how to remove, disassemble, and reinstall the compo-
nents of the instrumentation. It contains a spare parts list, and other im-
portant information. Do not service the instrumentation until you have
read and understand the information in this chapter.
•
Troubleshooting - Provides detailed troubleshooting information that will
help you identify faulty components within the instrumentation.
•
Using the Handheld Diagnostic Tool (HDT) - Describes the operation of
the handheld diagnostic tool used to help diagnose problems with the
instrumentation.
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