ECM Connectors

	MEFI 1-4 ECM Connectors These are used in the older MEFI controllers from MEFI1 to MEFI 4B. Even though MEFI1 and MEFI2 have a different enclosure style as the MEFI3 and MEFI4 the connectors used (and the keying on those connectors) are the same.
	MEFI 5-6/ E67 ECM Connectors These are used in the newer MEFI controllers, MEFI5 and MEFI6 and the GM production ECM E67.
	ECM555 / PCM555 Connectors These are used in the Motorola series of engine controllers, both the two connector version and the 3 connector version.

Diagnostic Connectors

	Vehicle Side	Test Equipment Side
OBD2
MEFI 1-4
MEFI 5-6, E67
Polaris Slingshot
ECM555 / PCM555
J1939
J1939 Type 2
CAT
J1708

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