GM Marine EFI
Page 15
Connecting to GM MEFI-5 and MEFI-6 systems
1) Locate the engine’s 6 pin CAN diagnostic connector. is connector may also
be referred to as the OBD-M connector (On-Board Diagnostics-Marine). e
location of this connector is specied in the engine manufacturer’s service
manual. Please note that the connector may have a protective cap covering it.
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 #94029
(CAN Adapter) is required for this application as shown in Figure 6 above.
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) Aer the scan tool displays its initial opening messages use the ▲ and ▼
keys to select the “Sterndrives / Inboards” menu item then press the YES key
to select it.
Figure 6 #94029 CAN Network Adapter
Engine #1 / Engine #2 Selection (MEFI 1 - 4 ECMs Only)
is 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 elec-
tronically linked twin engine installation.
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