GM Marine EFI
Connecting to GM MEFI-1 thru MEFI-4 systems
(For connecting to GM MEFI-5 CAN based systems see page 15)
1) Locate the engine’s 10 pin marine diagnostic connector (DLC). The location of
this connector is specified in the engine manufacturer’s service manual. Please be
aware that the connector may have a protective cap attached to it. Shown below
are photos depicting common locations of the GM diagnostic connector.
Note:
Some manufacturers place a protective cover over the GM diagnostic
connector which must be removed in order to connect the scan tool to the
engine. Be sure to replace the connector cover, if used, in order to protect the
diagnostic connector’s electrical terminals from water and corrosion.
Page 13
Figure 2 GM EFI Diagnostic Connector
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