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SERVICE MANUAL NUMBER 23
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 MerCruiser
Electronic Fuel Injection (Multi-Port And Throttle Body) 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 manual has been prepared for effective diagnosis of the MerCruiser
Electronic Fuel Injection 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
MerCruiser engine control systems are built.
Visual / Physical Inspection
A careful visual and physical inspection must be performed as part of any diagnostic
procedure. This can often lead to fixing a problem without further steps. Inspect all
vacuum hoses for correct routing, pinches, cuts or disconnects. Be sure to inspect hoses
that are difficult to see. Inspect all the wires in the engine compartment for proper connec-
tions, burned or chafed spots, pinched wires contact with sharp edges or hot exhaust man-
ifolds. This visual/physical inspection is very important. It must be done carefully and thor-
oughly.
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 equip-
ment are required. Please become acquainted with the tools and their use before attempting
to diagnose the system. Special tools that are required for system service are listed later
in this section (see "Table of Contents").
Index
90-861326--1 MARCH 1999
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MULTI-PORT FUEL INJECTION DESCRIPTIONS AND SYSTEM OPERATION
CAUTION
Page 5B-3
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