GM Marine EFI
2) With the engine’s ignition switch in the OFF position, plug the scan tool’s
communication cable into the diagnostic connector. Scan tool adapter #94005 is
required for this application.
3) Once the tool is connected, turn the ignition switch ON and start the engine if
necessary. If the engine will not start, simply leave the ignition switch ON and
proceed.
4) After the scan tool displays its initial opening messages, use the s and t keys to
select the “Marine EFI” operating mode, then press the YES key to select it.
Connecting Twin Engine Systems
In a twin engine configuration, the ECM modules (one on each engine) may be
electronically linked
together. This link is usually installed by the boat manufacturer
and provides the ability to diagnose both engines from a single diagnostic connector.
With the exception of setting the engine’s base timing, all scanner functions are
available for accessing both engines from one diagnostic plug. In order for the
scanner to function properly in this mode, the ignition keys should be ON for BOTH
engines. It is not necessary to have the engines running, but both ignition systems
should be turned on (Key On/Engine OFF).
For twin installations that are NOT electronically linked
together, you must connect
to and service each engine individually. In this situation, each engine in the twin
installation will respond as Engine #1.
Engine #1 / Engine #2 Selection (MEFI ECMs Only)
This menu allows you to select which engine you would like to service. For a single
engine system, choose Engine #1.
For a twin engine system where the engines are electronically linked together, choose
Engine #1 or Engine #2.
If you are diagnosing a twin engine system that is NOT electronically linked
together, you must have the scanner attached to the diagnostic connector on
the engine you wish to service and choose Engine #1.
Remember, both ignition systems should be ON when troubleshooting an
electronically linked twin engine installation.
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