Service Precautions - Mercury MerCruiser D2.8L D-Tronic Service Manual

SERVICE MANUAL NUMBER 22

Service Precautions

Observe the following when working on EDI equipped engines:
•
Before removing any ECM system component, disconnect the negative battery
cable.
•
Never start the engine without the battery cable terminal ends being solidly
connected.
•
Never separate the battery from the on-board electrical system while the engine is
operating.
•
Never separate the battery feed wire from the charging system while the engine is
operating.
•
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 connectors.
•
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 take place.
•
Use only the test equipment specified in the diagnostic charts, since other test
equipment 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.
90-860074--1 FEBRUARY 2002
EDI DIAGNOSIS
Page 5E-5