General Information; Introduction; Basic Knowledge And Tools Required - Mercury MerCruiser D2.8L D-Tronic Service Manual

EDI DIAGNOSIS

General Information

To reduce the chance of personal injury and/or property damage, the following
instructions must be carefully observed: proper service and repair are important to
the safety of the service technician and the safe, reliable operation of all Mercury
MerCruiser Electronic Diesel Injection (EDI) equipped engines. If part replacement
is necessary, the part must be replaced with one of the same part number or with
an equivalent part. Do NOT use a replacement part of lesser quality. The service
procedures recommended and described in this service manual are effective
methods of performing service and repair. Some of these procedures require the
use of tools specially designed for the purpose. Accordingly, anyone who intends
to use a replacement part, service procedure or tool, which is not recommended by
the system manufacturer, must first determine that neither his safety nor the safe
operation of the engine will be jeopardized by the replacement part, service
procedure or tool selected. It is important to note that this manual contains various
"Cautions" and "Notes" that must be carefully observed in order to reduce the risk
of personal injury during service or repair, or the possibility that improper service
or repair may damage the engine or render it unsafe. It is also important to
understand that these "Cautions" and "Notes" are not exhaustive, because it is
impossible to warn of all the possible hazardous consequences that might result
from failure to follow these instructions.

Introduction

The following pages been prepared for effective diagnosis of the Mercury MerCruiser
Electronic Diesel Injection (EDI) system.
All information, illustrations and specifications contained in this manual are based on the
latest product information available at the time of publication approval. The right is reserved
to make changes at any time without notice.
An understanding of the material contained herein and in subsequent publications issued
when necessary, will assist service personnel in properly maintaining the quality to which
Mercury MerCruiser engine control systems are built.

Basic Knowledge and Tools Required

To use this manual most effectively, a general understanding of basic electrical circuits and
circuit testing tools is required. You should be familiar with wiring diagrams; the meaning of
volts, ohms and amperes; the basic theories of electricity; and understand what happens
in an open or shorted wire. To perform system diagnosis, several special tools and
equipment are required. Please become acquainted with the tools and their use before
attempting to diagnose the system. Special tools, which are required for system service, are
listed later in this section. Refer to the Table of Contents.
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CAUTION
SERVICE MANUAL NUMBER 22
90-860074--1 FEBRUARY 2002