72 pin Connector

See also Mazda Miata 2003 alt

For power see Mazda Miata 2002 - Starting & Power

Connector Face

Coil three wire plug:

middle wire GND

pin closer to the engine is +12v

pin further away from the engine signal

Hellen72 Interactive Pinout

desc type rusEFI harness
MAP signal analog blue
AFR signal analog white

Wiring Diagram

Individual pages for printing: Wiring Diagram

Wiring Diagram

Wiring Diagram

Automatic Transmission

see Mazda Miata 2001 - Automatic Transmission

Wiring Diagram

Immobilizer

NALDEC NC87 67 790 MAZDA MX5 EUNOS MK2 MK2.5 BURGLAR ALARM MODULE NC8767790 is not an immobilizer

US immobilizer Wiring Diagram

Wiper Motor

Wiring Diagram

Charging

Wiring Diagram

Air Conditioning

Wiring Diagram

See also Mazda Miata 2002

Starting & power

In start or run ECU is powered from Engine Fuse 15A (behind left side of dash) via 4S. (This is different from 2002 - nothing on 4S in 2002)

ECU controls main relay via 3H. (This is different from 2002 - nothing on 3H in 2002)

ECU gets +12v from main relay output 4AF which is used as +12v source for VVT (4D) and IAC (2P).

Fly-back diode - stripe facing +12 - is needed between VVT 4D (power, stripe side) and VVT control 4R.

Fly-back diode - stripe facing +12 - is needed between IAC 2P (power, stripe side) and IAC control 2Q.

See http://rusefi.com/forum/viewtopic.php?f=3&t=906&p=25018l#p25018

For ignition key see Mazda Miata 2002 - Starting & Power

Misc

Two timing marks - the left one is TDC