Ignition Control System Components; General Precautions - Mercury MerCruiser MCM 454 Mag MPI Service Manual

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SERVICE MANUAL NUMBER 23

Ignition Control System Components

General Precautions

Avoid personal injury and/or property damage. Listed below are some of the pre-
cautions, along with others listed throughout this manual, that you should observe
to help ensure an accident-free maintenance experience:
EFI System Maintenance Precautions
Avoid Injury or Electrical System Damage: Always disconnect battery cables from
battery before working around electrical system components. See CAUTION
following:
Avoid damage to the EFI electrical system components: Refer to the following
precautions when working on or around the EFI electrical harness, or when adding
other electrical accessories:
Index
90-861326--1 MARCH 1999
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Always disconnect battery cables from battery BEFORE working on electrical
system to prevent injury to yourself or damage to electrical system.
Be sure that engine compartment is well ventilated and that no gasoline vapors
are present, to avoid the possibility of fire.
Be sure to keep hands, feet and clothing clear of moving parts.
Do not touch or disconnect any ignition system parts while engine is running.
Do not reverse battery cable connections. System is negative (–) ground.
Do not disconnect battery cables while engine is running.
When working on engine, spark plug holes and carburetor throat should be kept
covered to prevent foreign objects from entering combustion chamber.
Replace a component if there is any doubt as to the condition of the component.
DO NOT tap accessories into engine harness.
DO NOT puncture wires for testing (Probing).
DO NOT reverse battery leads.
DO NOT splice wires into harness.
DO NOT attempt diagnostics without proper, approved Service Tools.
CAUTION
WARNING
CAUTION
IGNITION SYSTEM
Page 4B-3

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