MULTI-PORT FUEL INJECTION DESCRIPTIONS AND SYSTEM OPERATION
SERVICE MANUAL NUMBER 23
90-861326--1 MARCH 1999 Page 5B-13
Precautions
The following requirements must be observed:
• Before removing any ECM system component, disconnect the negative battery cable.
• Never start the engine without the battery being solidly connected.
• Never separate the battery from the on-board electrical system while the engine is run-
ning.
• Never separate the battery feed wire from the charging system while the engine is run-
ning.
• When charging the battery, disconnect it from the boat’s electrical system.
• Ensure that all cable harnesses are connected solidly and that battery connections are
thoroughly clean.
• Never connect or disconnect the wiring harness at the ECM when the ignition is switched
ON.
• Before attempting any electric arc welding, disconnect the battery leads and the ECM
connector(s).
• When steam cleaning engines, do not direct the steam cleaning nozzle at ECM system
components. If this happens, corrosion of the terminals or damage of components can
occur.
• Use only the test equipment specified in the diagnostic charts, since other test equip-
ment may either give incorrect results or damage good components.
• All voltage measurements using a voltmeter require a digital voltmeter with a rating of 10
megohms input impedance.
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