See also Mazda Miata 2003 alt
For power see Mazda Miata 2002 - Starting & Power
Coil three wire plug:
middle wire GND
pin closer to the engine is +12v
pin further away from the engine signal
Individual pages for printing:
NALDEC NC87 67 790 MAZDA MX5 EUNOS MK2 MK2.5 BURGLAR ALARM MODULE NC8767790 is not an immobilizer
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.
For ignition key see Mazda Miata 2002 - Starting & Power
Two timing marks - the left one is TDC