Mazda OBD II diagnostic interface pinout and wiring @ pinoutsguide.com

used in Mazda's produced after 1996

Pin	Signal	Description
2	J1850 Bus+
3	LS CAN Hi	Low speed (125Kb) CAN bus. This bus used for some IC, RFA and other units.
4	CGND	Chassis ground
5	SGND	Signal ground
6	CAN High	J-2284
7	K-LINE	Diagnostic, (ISO 9141-2 and ISO/DIS 14230-4)
10	J1850 Bus-
11	LS CAN Low	Low speed (125Kb) CAN bus. This bus used for some IC, RFA and other units.
14	CAN Low	J-2284
15	ISO 9141-2 L-LINE	Diagnostic, (ISO 9141-2 and ISO/DIS 14230-4)
16	+12v	Battery power

Protocols used:

1996-2002 : ISO-9141

2002-2005 : ISO-9141 or CAN

after 2005 : CAN

Mazda (Ford) used J1850-PWM mostly.

Some OBD-II cables schemes:

OBD-2 ISO 9141-2 (14230-4, KWP2000) simple serial cable
OBD-2 J1850 PWM, J1850 VPW serial ELM327 cable
OBD-2 universal ISO 15765-4 CAN, SAE J1850 PWM, SAE J1850 VPW, ISO 9141-2, ISO 14230-4 and SAE J1939 diagnostic cable

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connector or cable wiring scheme

Mazda OBD II diagnostic interface pinout

Some OBD-II cables schemes: