MX-5 Miata NB2 2001-05 (BP-Z3, VVT; excludes Mazdaspeed) → Motorsport Electronics ME360 (auto)

MX-5 Miata NB2 2001-05 (BP-Z3, VVT; excludes Mazdaspeed) — Motorsport Electronics — ME360

Drawn by Michael Gnankou · Rev 0 · proposal · 2026-10-09

Before you start

Not confident with automotive wiring? Have a professional harness builder or tuner do it, or check your work before first power-up. A wiring mistake can damage the ECU, the engine or the car, or start a fire.

Install modifications

Steps on the car itself, outside the harness. Every harness for this car inherits them.

Re-route the pressure-sensor vacuum hose to the intake manifoldrequired
Re-route the pressure sensor's (Mazda "EGR boost sensor", pin 4AE) vacuum hose directly to the intake manifold, bypassing the EGR boost solenoid. The stock ECU multiplexes baro + MAP through that solenoid: with it off the sensor reads atmosphere, with it energized it reads manifold. After re-routing the sensor reads MAP only, so the standalone needs its own barometric source — its onboard baro sensor if fitted, or a separate baro sensor on a spare analog input. (Alternative, not recommended: keep the hose stock and have the ECU energize the solenoid permanently via a low-side output switched with ignition; this costs an output.)
Why: With the solenoid off (its default) the sensor reads atmospheric pressure, not manifold pressure, so a standalone that uses this sensor as its MAP input would read the wrong value.
Where: EGR boost solenoid and the pressure sensor's vacuum hose (sensor signal 4AE).
Source: Justin Barrera — Miata NA/NB wiring corrections

Status	proposal · not yet verified: nobody has reported building and running this harness
Open errors	none
Size of the job	52 wires · 7 connectors · 0 part lines
Tools	Crimp and extraction tools for each terminal family (see Connectors) · wire strippers · multimeter · heat gun + heat-shrink
Order of work	1. Check every part against the parts list. 2. Cut and label every wire (labels: Export → Wire labels). 3. Crimp and pin connector by connector, ticking the build checklist. 4. Run the bench test with nothing plugged in and the battery disconnected. 5. Only then connect the ECU and power up.

Build checklist

Tick each box as you go. Continuity: meter from end to end, expect under 1 Ω.

Wire	From	To	Gauge	Cut	Label	Crimp A	Crimp B	Pin A	Pin B	Continuity
W1	OEM-2-P	SP-14V-1	0.85	☐	☐	☐	☐	☐	☐	☐
W2	OEM-4-AF	SP-14V-1	0.85	☐	☐	☐	☐	☐	☐	☐
W3	SP-14V-1	ME360-C1-15	0.85	☐	☐	☐	☐	☐	☐	☐
W4	SP-14V-1	ME360-C1-64	0.85	☐	☐	☐	☐	☐	☐	☐
W5	OEM-3-A	SP-GND-1	0.85	☐	☐	☐	☐	☐	☐	☐
W6	OEM-3-B	SP-GND-1	0.85	☐	☐	☐	☐	☐	☐	☐
W7	OEM-4-A	SP-GND-1	0.85	☐	☐	☐	☐	☐	☐	☐
W8	SP-GND-1	ME360-C1-10	0.85	☐	☐	☐	☐	☐	☐	☐
W9	SP-GND-1	ME360-C1-61	0.85	☐	☐	☐	☐	☐	☐	☐
W10	SP-GND-1	ME360-C1-89	0.85	☐	☐	☐	☐	☐	☐	☐
W11	SP-GND-1	ME360-C1-90	0.85	☐	☐	☐	☐	☐	☐	☐
W12	OEM-4-O	SP-0V-1	0.5	☐	☐	☐	☐	☐	☐	☐
W13	SP-0V-1	ME360-C1-52	0.5	☐	☐	☐	☐	☐	☐	☐
W14	SP-0V-1	ME360-C1-84	0.5	☐	☐	☐	☐	☐	☐	☐
W15	OEM-4-L	ME360-C1-45	0.5	☐	☐	☐	☐	☐	☐	☐
W16	OEM-3-Y	ME360-C1-81	0.5	☐	☐	☐	☐	☐	☐	☐
W17	OEM-3-V	ME360-C1-22	0.5	☐	☐	☐	☐	☐	☐	☐
W18	OEM-4-M	ME360-C1-53	0.5	☐	☐	☐	☐	☐	☐	☐
W19	OEM-3-F	ME360-C1-32	0.5	☐	☐	☐	☐	☐	☐	☐
W20	OEM-3-I	ME360-C1-31	0.5	☐	☐	☐	☐	☐	☐	☐
W21	OEM-2-A	ME360-C1-63	0.5	☐	☐	☐	☐	☐	☐	☐
W22	OEM-2-D	ME360-C1-4	0.5	☐	☐	☐	☐	☐	☐	☐
W23	OEM-2-G	ME360-C1-33	0.5	☐	☐	☐	☐	☐	☐	☐
W24	OEM-2-J	ME360-C1-3	0.5	☐	☐	☐	☐	☐	☐	☐
W25	OEM-2-B	ME360-C1-73	0.5	☐	☐	☐	☐	☐	☐	☐
W26	OEM-2-C	ME360-C1-12	0.5	☐	☐	☐	☐	☐	☐	☐
W27	OEM-2-K	ME360-C1-74	0.5	☐	☐	☐	☐	☐	☐	☐
W28	OEM-2-M	ME360-C1-44	0.5	☐	☐	☐	☐	☐	☐	☐
W29	OEM-3-H	ME360-C1-69	0.5	☐	☐	☐	☐	☐	☐	☐
W30	OEM-3-J	ME360-C1-16	0.5	☐	☐	☐	☐	☐	☐	☐
W31	OEM-3-P	ME360-C1-39	0.5	☐	☐	☐	☐	☐	☐	☐
W32	OEM-2-Q	ME360-C1-28	0.5	☐	☐	☐	☐	☐	☐	☐
W33	OEM-2-E	ME360-C1-58	0.5	☐	☐	☐	☐	☐	☐	☐
W34	OEM-2-F	ME360-C1-67	0.5	☐	☐	☐	☐	☐	☐	☐
W35	OEM-2-H	ME360-C1-68	0.5	☐	☐	☐	☐	☐	☐	☐
W36	OEM-2-I	ME360-C1-70	0.5	☐	☐	☐	☐	☐	☐	☐
W37	OEM-2-N	ME360-C1-71	0.5	☐	☐	☐	☐	☐	☐	☐
W38	OEM-2-R	ME360-C1-65	0.5	☐	☐	☐	☐	☐	☐	☐
W39	OEM-3-E	ME360-C1-66	0.5	☐	☐	☐	☐	☐	☐	☐
W40	OEM-3-O	ME360-C1-79	0.5	☐	☐	☐	☐	☐	☐	☐
W41	OEM-4-X	ME360-C1-26	0.5	☐	☐	☐	☐	☐	☐	☐
W42	OEM-4-AE	ME360-C1-56	0.5	☐	☐	☐	☐	☐	☐	☐
W43	OEM-4-V	ME360-C1-17	0.5	☐	☐	☐	☐	☐	☐	☐
W44	OEM-4-AA	ME360-C1-18	0.5	☐	☐	☐	☐	☐	☐	☐
W45	OEM-4-P	ME360-C1-86	0.5	☐	☐	☐	☐	☐	☐	☐
W46	OEM-4-N	ME360-C1-57	0.5	☐	☐	☐	☐	☐	☐	☐
W47	OEM-3-T	ME360-C1-6	0.5	☐	☐	☐	☐	☐	☐	☐
W48	OEM-3-S	ME360-C1-7	0.5	☐	☐	☐	☐	☐	☐	☐
W49	OEM-4-B	ME360-C1-8	0.5	☐	☐	☐	☐	☐	☐	☐
W50	OEM-4-C	ME360-C1-5	0.5	☐	☐	☐	☐	☐	☐	☐
W51	OEM-4-F	ME360-C1-62	0.5	☐	☐	☐	☐	☐	☐	☐
W52	OEM-4-H	ME360-C1-34	0.5	☐	☐	☐	☐	☐	☐	☐

Bench test (before first power-up)

Pre-power install steps (make these cuts/modifications on the car first, then verify the checks below): Re-route the pressure-sensor vacuum hose to the intake manifold.

Battery disconnected, ECU and every sensor unplugged. Meter on resistance. Each pair below must read open (OL): a reading means a pinched wire, a stray strand or a mis-pinned cavity. Then check continuity of every wire (last column of the build checklist).

#	Probe A	Probe B	Expect	Why
1	ME360-C1-15	ME360-C1-10	open (OL)	+12 V supply must not touch power ground
2	ME360-C1-15	ME360-C1-52	open (OL)	+12 V supply must not touch sensor ground
3	ME360-C1-45	ME360-C1-52	open (OL)	5 V sensor reference must not touch sensor ground
4	ME360-C1-10	ME360-C1-45	open (OL)	power ground must not touch 5 V sensor reference
5	ME360-C1-15	ME360-C1-45	open (OL)	+12 V supply must not touch 5 V sensor reference

If any reading doesn't match, stop and get help before powering up.

Revisions

Rev	Label	By	Date
No revisions yet.

Schematic

Connectors

ME360-C1

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
1	COIL 4	—	—	—	—	—	—	—	—
10	GROUND CHASSIS	—	W8	—	0.85	SP-GND-1	—	—	—
11	EGT 1	—	—	—	—	—	—	—	—
12	LOW SIDE 2	—	W26	—	0.5	OEM-2-C	—	—	—
13	LOW SIDE RELAY 15	—	—	—	—	—	—	—	—
14	LSU +12V	—	—	—	—	—	—	—	—
15	IGN +12V	—	W3	—	0.85	SP-14V-1	—	—	—
16	LSU HEATER -VE	—	W30	—	0.5	OEM-3-J	—	—	—
17	ANA VOLT 3	—	W43	—	0.5	OEM-4-V	—	—	—
18	ANA VOLT 4	—	W44	—	0.5	OEM-4-AA	—	—	—
19	LSU UN	—	—	—	—	—	—	—	—
2	COIL 3	—	—	—	—	—	—	—	—
20	LSU VM	—	—	—	—	—	—	—	—
21	CAN 1 HIGH	—	—	—	—	—	—	—	—
22	CAM A VR+	—	W17	—	0.5	OEM-3-V	—	—	—
23	CAM A VR-	—	—	—	—	—	—	—	—
24	SERIAL 1 GROUND	—	—	—	—	—	—	—	—
25	SERIAL 1 TX	—	—	—	—	—	—	—	—
26	ANA VOLT 1	—	W41	—	0.5	OEM-4-X	—	—	—
28	INJECTOR 5	—	W32	—	0.5	OEM-2-Q	—	—	—
3	INJECTOR 4	—	W24	—	0.5	OEM-2-J	—	—	—
31	COIL 2	—	W20	—	0.5	OEM-3-I	—	—	—
32	COIL 1	—	W19	—	0.5	OEM-3-F	—	—	—
33	INJECTOR 3	—	W23	—	0.5	OEM-2-G	—	—	—
34	DIG_IN 6	—	W52	—	0.5	OEM-4-H	—	—	—
35	USB D+	—	—	—	—	—	—	—	—
36	USB D-	—	—	—	—	—	—	—	—
37	LOW SIDE RELAY 11	—	—	—	—	—	—	—	—
38	USB VBUS	—	—	—	—	—	—	—	—
39	LOW SIDE 6	—	W31	—	0.5	OEM-3-P	—	—	—
4	INJECTOR 2	—	W22	—	0.5	OEM-2-D	—	—	—
40	LOW SIDE RELAY 17	—	—	—	—	—	—	—	—
41	USB GROUND	—	—	—	—	—	—	—	—
42	LOW SIDE RELAY 12	—	—	—	—	—	—	—	—
43	LOW SIDE RELAY 14	—	—	—	—	—	—	—	—
44	LOW SIDE 4	—	W28	—	0.5	OEM-2-M	—	—	—
45	5V REF	—	W15	—	0.5	OEM-4-L	—	—	—
46	5V REF	—	—	—	—	—	—	—	—
49	LSU IA	—	—	—	—	—	—	—	—
5	DIG_IN 4	—	W50	—	0.5	OEM-4-C	—	—	—
50	LSU IP	—	—	—	—	—	—	—	—
51	CAN 1 LOW	—	—	—	—	—	—	—	—
52	SENSORS GROUND	—	W13	—	0.5	SP-0V-1	—	—	—
53	KNOCK 1 SIGNAL	—	W18	—	0.5	OEM-4-M	—	—	—
55	SERIAL 1 RX	—	—	—	—	—	—	—	—
56	ANA VOLT 2	—	W42	—	0.5	OEM-4-AE	—	—	—
57	ANA TEMP 2	—	W46	—	0.5	OEM-4-N	—	—	—
58	INJECTOR 6	—	W33	—	0.5	OEM-2-E	—	—	—
59	COIL 5	—	—	—	—	—	—	—	—
6	DIG_IN 1	—	W47	—	0.5	OEM-3-T	—	—	—
60	COIL 6	—	—	—	—	—	—	—	—
61	GROUND	—	W9	—	0.85	SP-GND-1	—	—	—
62	DIG_IN 5	—	W51	—	0.5	OEM-4-F	—	—	—
63	INJECTOR 1	—	W21	—	0.5	OEM-2-A	—	—	—
64	VBAT	—	W4	—	0.85	SP-14V-1	—	—	—
65	H-BRIDGE A OUT 1	—	W38	—	0.5	OEM-2-R	—	—	—
66	H-BRIDGE A OUT 2	—	W39	—	0.5	OEM-3-E	—	—	—
67	Stepper 1 / A1	—	W34	—	0.5	OEM-2-F	—	—	—
68	Stepper 2 / A2	—	W35	—	0.5	OEM-2-H	—	—	—
69	LOW SIDE 5	—	W29	—	0.5	OEM-3-H	—	—	—
7	DIG_IN 2	—	W48	—	0.5	OEM-3-S	—	—	—
70	Stepper 3 / B1	—	W36	—	0.5	OEM-2-I	—	—	—
71	Stepper 4 / B2	—	W37	—	0.5	OEM-2-N	—	—	—
72	LOW SIDE RELAY 13	—	—	—	—	—	—	—	—
73	LOW SIDE 1	—	W25	—	0.5	OEM-2-B	—	—	—
74	LOW SIDE 3	—	W27	—	0.5	OEM-2-K	—	—	—
75	LOW SIDE RELAY 16	—	—	—	—	—	—	—	—
76	5V REF	—	—	—	—	—	—	—	—
77	ANA TEMP 3	—	—	—	—	—	—	—	—
79	TACHOMETER	—	W40	—	0.5	OEM-3-O	—	—	—
8	DIG_IN 3	—	W49	—	0.5	OEM-4-B	—	—	—
80	CRANK VR-	—	—	—	—	—	—	—	—
81	CRANK VR+	—	W16	—	0.5	OEM-3-Y	—	—	—
82	CAM B VR-	—	—	—	—	—	—	—	—
83	CAM B VR+	—	—	—	—	—	—	—	—
84	Sensor Ground	—	W14	—	0.5	SP-0V-1	—	—	—
86	ANA TEMP 1	—	W45	—	0.5	OEM-4-P	—	—	—
89	GROUND	—	W10	—	0.85	SP-GND-1	—	—	—
9	LOW SIDE RELAY 18	—	—	—	—	—	—	—	—
90	GROUND	—	W11	—	0.85	SP-GND-1	—	—	—

OEM-2

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
A	Injector 1	—	W21	—	0.5	ME360-C1-63	—	—	—
B	Cooling fan relay	—	W25	—	0.5	ME360-C1-73	—	—	—
C	Condenser fan relay	—	W26	—	0.5	ME360-C1-12	—	—	—
D	Injector 2	—	W22	—	0.5	ME360-C1-4	—	—	—
E	EGR valve	—	W33	—	0.5	ME360-C1-58	—	—	—
F	EGR valve	—	W34	—	0.5	ME360-C1-67	—	—	—
G	Injector 3	—	W23	—	0.5	ME360-C1-33	—	—	—
H	EGR valve	—	W35	—	0.5	ME360-C1-68	—	—	—
I	EGR valve	—	W36	—	0.5	ME360-C1-70	—	—	—
J	Injector 4	—	W24	—	0.5	ME360-C1-3	—	—	—
K	A/C clutch relay	—	W27	—	0.5	ME360-C1-74	—	—	—
M	Fuel pump relay	—	W28	—	0.5	ME360-C1-44	—	—	—
N	VTCS solenoid (intake butterflies)	—	W37	—	0.5	ME360-C1-71	—	—	—
P	ISC valve +14V feed	—	W1	—	0.85	SP-14V-1	—	—	—
Q	ISC valve low side	—	W32	—	0.5	ME360-C1-28	—	—	—
R	Malfunction indicator lamp (MIL)	—	W38	—	0.5	ME360-C1-65	—	—	—

OEM-3

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
A	Power ground	—	W5	—	0.85	SP-GND-1	—	—	—
B	Power ground	—	W6	—	0.85	SP-GND-1	—	—	—
D	EGR boost solenoid	—	—	—	—	—	—	—	—
E	Charcoal canister purge	—	W39	—	0.5	ME360-C1-66	—	—	—
F	Ignition 1 (coils 1+4, wasted spark)	—	W19	—	0.5	ME360-C1-32	—	—	—
H	Main relay	—	W29	—	0.5	ME360-C1-69	—	—	—
I	Ignition 2 (coils 2+3, wasted spark)	—	W20	—	0.5	ME360-C1-31	—	—	—
J	Front O2 heater	—	W30	—	0.5	ME360-C1-16	—	—	—
M	Alternator control	—	—	—	—	—	—	—	—
O	Tachometer output	—	W40	—	0.5	ME360-C1-79	—	—	—
P	Rear O2 heater	—	W31	—	0.5	ME360-C1-39	—	—	—
S	Immobiliser	—	W48	—	0.5	ME360-C1-7	—	—	—
T	Vehicle speed	—	W47	—	0.5	ME360-C1-6	—	—	—
U	Charge lamp	—	—	—	—	—	—	—	—
V	Cam position (CMP)	—	W17	—	0.5	ME360-C1-22	—	—	—
Y	Crank position (CKP)	—	W16	—	0.5	ME360-C1-81	—	—	—

OEM-4

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
A	Power ground	—	W7	—	0.85	SP-GND-1	—	—	—
AA	Rear O2 signal	—	W44	—	0.5	ME360-C1-18	—	—	—
AD	Fuel level	—	—	—	—	—	—	—	—
AE	Pressure sensor (Mazda: EGR boost sensor)	—	W42	—	0.5	ME360-C1-56	—	—	—
AF	ECU power +14V (main relay)	—	W2	—	0.85	SP-14V-1	—	—	—
AG	Constant +12V	—	—	—	—	—	—	—	—
B	Brake switch	—	W49	—	0.5	ME360-C1-8	—	—	—
C	Power steering pressure switch	—	W50	—	0.5	ME360-C1-5	—	—	—
D	VVT oil-control solenoid	—	—	—	—	—	—	—	—
F	A/C request	—	W51	—	0.5	ME360-C1-62	—	—	—
H	Neutral switch	—	W52	—	0.5	ME360-C1-34	—	—	—
I	Clutch switch	—	—	—	—	—	—	—	—
J	VTCS vacuum switch	—	—	—	—	—	—	—	—
L	+5V sensor supply	—	W15	—	0.5	ME360-C1-45	—	—	—
M	Knock sensor	—	W18	—	0.5	ME360-C1-53	—	—	—
N	Intake air temperature (IAT)	—	W46	—	0.5	ME360-C1-57	—	—	—
O	Signal ground	—	W12	—	0.5	SP-0V-1	—	—	—
P	Coolant temperature (ECT)	—	W45	—	0.5	ME360-C1-86	—	—	—
V	Throttle position (TPS)	—	W43	—	0.5	ME360-C1-17	—	—	—
W	Front O2 signal	—	—	—	—	—	—	—	—
X	Mass air flow (MAF)	—	W41	—	0.5	ME360-C1-26	—	—	—

SP-0V

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
1	—	—	W12	—	0.5	OEM-4-O	—	—	—
1	—	—	W13	—	0.5	ME360-C1-52	—	—	—
1	—	—	W14	—	0.5	ME360-C1-84	—	—	—

SP-14V

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
1	—	—	W1	—	0.85	OEM-2-P	—	—	—
1	—	—	W2	—	0.85	OEM-4-AF	—	—	—
1	—	—	W3	—	0.85	ME360-C1-15	—	—	—
1	—	—	W4	—	0.85	ME360-C1-64	—	—	—

SP-GND

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
1	—	—	W5	—	0.85	OEM-3-A	—	—	—
1	—	—	W6	—	0.85	OEM-3-B	—	—	—
1	—	—	W7	—	0.85	OEM-4-A	—	—	—
1	—	—	W8	—	0.85	ME360-C1-10	—	—	—
1	—	—	W9	—	0.85	ME360-C1-61	—	—	—
1	—	—	W10	—	0.85	ME360-C1-89	—	—	—
1	—	—	W11	—	0.85	ME360-C1-90	—	—	—

Pin map

OEM point	OEM function	OEM family	Target point	Target function	Target family	Evidence
OEM-2-A	Injector 1	injector_out	ME360-C1-63	INJECTOR 1	injector_out	single_source
OEM-2-B	Cooling fan relay	low_side_out	ME360-C1-73	LOW SIDE 1	low_side_out	single_source
OEM-2-C	Condenser fan relay	low_side_out	ME360-C1-12	LOW SIDE 2	low_side_out	single_source
OEM-2-D	Injector 2	injector_out	ME360-C1-4	INJECTOR 2	injector_out	single_source
OEM-2-E	EGR valve	low_side_out	ME360-C1-58	INJECTOR 6	injector_out	single_source
OEM-2-F	EGR valve	low_side_out	ME360-C1-67	Stepper 1 / A1	hbridge_out	single_source
OEM-2-G	Injector 3	injector_out	ME360-C1-33	INJECTOR 3	injector_out	single_source
OEM-2-H	EGR valve	low_side_out	ME360-C1-68	Stepper 2 / A2	hbridge_out	single_source
OEM-2-I	EGR valve	low_side_out	ME360-C1-70	Stepper 3 / B1	hbridge_out	single_source
OEM-2-J	Injector 4	injector_out	ME360-C1-3	INJECTOR 4	injector_out	single_source
OEM-2-K	A/C clutch relay	low_side_out	ME360-C1-74	LOW SIDE 3	low_side_out	single_source
OEM-2-M	Fuel pump relay	low_side_out	ME360-C1-44	LOW SIDE 4	low_side_out	single_source
OEM-2-N	VTCS solenoid (intake butterflies)	low_side_out	ME360-C1-71	Stepper 4 / B2	hbridge_out	single_source
OEM-2-P	ISC valve +14V feed	power_in	ME360-C1-15 + ME360-C1-64	IGN +12V + VBAT	power_in	single_source
OEM-2-Q	ISC valve low side	low_side_out	ME360-C1-28	INJECTOR 5	injector_out	single_source
OEM-2-R	Malfunction indicator lamp (MIL)	low_side_out	ME360-C1-65	H-BRIDGE A OUT 1	hbridge_out	single_source
OEM-3-A	Power ground	ground	ME360-C1-10 + ME360-C1-61 + ME360-C1-89 + ME360-C1-90	GROUND CHASSIS + GROUND + GROUND + GROUND	ground	single_source
OEM-3-B	Power ground	ground	ME360-C1-10 + ME360-C1-61 + ME360-C1-89 + ME360-C1-90	GROUND CHASSIS + GROUND + GROUND + GROUND	ground	single_source
OEM-3-D	EGR boost solenoid	—	—	—	—	single_source
OEM-3-E	Charcoal canister purge	low_side_out	ME360-C1-66	H-BRIDGE A OUT 2	hbridge_out	single_source
OEM-3-F	Ignition 1 (coils 1+4, wasted spark)	ignition_out	ME360-C1-32	COIL 1	ignition_out	single_source
OEM-3-H	Main relay	low_side_out	ME360-C1-69	LOW SIDE 5	low_side_out	single_source
OEM-3-I	Ignition 2 (coils 2+3, wasted spark)	ignition_out	ME360-C1-31	COIL 2	ignition_out	single_source
OEM-3-J	Front O2 heater	low_side_out	ME360-C1-16	LSU HEATER -VE	low_side_out	single_source
OEM-3-M	Alternator control	low_side_out	—	—	—	single_source
OEM-3-O	Tachometer output	tacho_out	ME360-C1-79	TACHOMETER	tacho_out	single_source
OEM-3-P	Rear O2 heater	low_side_out	ME360-C1-39	LOW SIDE 6	low_side_out	single_source
OEM-3-S	Immobiliser	digital_in	ME360-C1-7	DIG_IN 2	digital_in	single_source
OEM-3-T	Vehicle speed	digital_in	ME360-C1-6	DIG_IN 1	digital_in	single_source
OEM-3-U	Charge lamp	low_side_out	—	—	—	single_source
OEM-3-V	Cam position (CMP)	trigger_in	ME360-C1-22	CAM A VR+	trigger_in	single_source
OEM-3-Y	Crank position (CKP)	trigger_in	ME360-C1-81	CRANK VR+	trigger_in	single_source
OEM-4-A	Power ground	ground	ME360-C1-10 + ME360-C1-61 + ME360-C1-89 + ME360-C1-90	GROUND CHASSIS + GROUND + GROUND + GROUND	ground	single_source
OEM-4-AA	Rear O2 signal	lambda_nb_in	ME360-C1-18	ANA VOLT 4	analog_in	single_source
OEM-4-AD	Fuel level	analog_in	—	—	—	single_source
OEM-4-AE	Pressure sensor (Mazda: EGR boost sensor)	analog_in	ME360-C1-56	ANA VOLT 2	analog_in	corroborated
OEM-4-AF	ECU power +14V (main relay)	power_in	ME360-C1-15 + ME360-C1-64	IGN +12V + VBAT	power_in	single_source
OEM-4-AG	Constant +12V	power_in	—	—	—	single_source
OEM-4-B	Brake switch	digital_in	ME360-C1-8	DIG_IN 3	digital_in	single_source
OEM-4-C	Power steering pressure switch	digital_in	ME360-C1-5	DIG_IN 4	digital_in	single_source
OEM-4-D	VVT oil-control solenoid	low_side_out	—	—	—	single_source
OEM-4-F	A/C request	digital_in	ME360-C1-62	DIG_IN 5	digital_in	single_source
OEM-4-H	Neutral switch	digital_in	ME360-C1-34	DIG_IN 6	digital_in	single_source
OEM-4-I	Clutch switch	digital_in	—	—	—	single_source
OEM-4-J	VTCS vacuum switch	digital_in	—	—	—	single_source
OEM-4-L	+5V sensor supply	vref	ME360-C1-45	5V REF	vref	single_source
OEM-4-M	Knock sensor	knock_in	ME360-C1-53	KNOCK 1 SIGNAL	knock_in	single_source
OEM-4-N	Intake air temperature (IAT)	temp_in	ME360-C1-57	ANA TEMP 2	temp_in	single_source
OEM-4-O	Signal ground	sensor_ground	ME360-C1-52 + ME360-C1-84	SENSORS GROUND + Sensor Ground	sensor_ground	single_source
OEM-4-P	Coolant temperature (ECT)	temp_in	ME360-C1-86	ANA TEMP 1	temp_in	single_source
OEM-4-V	Throttle position (TPS)	analog_in	ME360-C1-17	ANA VOLT 3	analog_in	single_source
OEM-4-W	Front O2 signal	lambda_nb_in	—	—	—	single_source
OEM-4-X	Mass air flow (MAF)	analog_in	ME360-C1-26	ANA VOLT 1	analog_in	single_source

Cut list

Wire	From	To	Gauge (mm²)	Length	Signal	Ident
W1	OEM-2-P	SP-14V-1	0.85	no route	ISC valve +14V feed	—
W2	OEM-4-AF	SP-14V-1	0.85	no route	ECU power +14V (main relay)	—
W3	SP-14V-1	ME360-C1-15	0.85	no route	IGN +12V	—
W4	SP-14V-1	ME360-C1-64	0.85	no route	VBAT	—
W5	OEM-3-A	SP-GND-1	0.85	no route	Power ground	—
W6	OEM-3-B	SP-GND-1	0.85	no route	Power ground	—
W7	OEM-4-A	SP-GND-1	0.85	no route	Power ground	—
W8	SP-GND-1	ME360-C1-10	0.85	no route	GROUND CHASSIS	—
W9	SP-GND-1	ME360-C1-61	0.85	no route	GROUND	—
W10	SP-GND-1	ME360-C1-89	0.85	no route	GROUND	—
W11	SP-GND-1	ME360-C1-90	0.85	no route	GROUND	—
W12	OEM-4-O	SP-0V-1	0.5	no route	Signal ground	—
W13	SP-0V-1	ME360-C1-52	0.5	no route	SENSORS GROUND	—
W14	SP-0V-1	ME360-C1-84	0.5	no route	Sensor Ground	—
W15	OEM-4-L	ME360-C1-45	0.5	no route	+5V sensor supply	—
W16	OEM-3-Y	ME360-C1-81	0.5	no route	Crank position (CKP)	—
W17	OEM-3-V	ME360-C1-22	0.5	no route	Cam position (CMP)	—
W18	OEM-4-M	ME360-C1-53	0.5	no route	Knock sensor	—
W19	OEM-3-F	ME360-C1-32	0.5	no route	Ignition 1 (coils 1+4, wasted spark)	—
W20	OEM-3-I	ME360-C1-31	0.5	no route	Ignition 2 (coils 2+3, wasted spark)	—
W21	OEM-2-A	ME360-C1-63	0.5	no route	Injector 1	—
W22	OEM-2-D	ME360-C1-4	0.5	no route	Injector 2	—
W23	OEM-2-G	ME360-C1-33	0.5	no route	Injector 3	—
W24	OEM-2-J	ME360-C1-3	0.5	no route	Injector 4	—
W25	OEM-2-B	ME360-C1-73	0.5	no route	Cooling fan relay	—
W26	OEM-2-C	ME360-C1-12	0.5	no route	Condenser fan relay	—
W27	OEM-2-K	ME360-C1-74	0.5	no route	A/C clutch relay	—
W28	OEM-2-M	ME360-C1-44	0.5	no route	Fuel pump relay	—
W29	OEM-3-H	ME360-C1-69	0.5	no route	Main relay	—
W30	OEM-3-J	ME360-C1-16	0.5	no route	Front O2 heater	—
W31	OEM-3-P	ME360-C1-39	0.5	no route	Rear O2 heater	—
W32	OEM-2-Q	ME360-C1-28	0.5	no route	ISC valve low side	—
W33	OEM-2-E	ME360-C1-58	0.5	no route	EGR valve	—
W34	OEM-2-F	ME360-C1-67	0.5	no route	EGR valve	—
W35	OEM-2-H	ME360-C1-68	0.5	no route	EGR valve	—
W36	OEM-2-I	ME360-C1-70	0.5	no route	EGR valve	—
W37	OEM-2-N	ME360-C1-71	0.5	no route	VTCS solenoid (intake butterflies)	—
W38	OEM-2-R	ME360-C1-65	0.5	no route	Malfunction indicator lamp (MIL)	—
W39	OEM-3-E	ME360-C1-66	0.5	no route	Charcoal canister purge	—
W40	OEM-3-O	ME360-C1-79	0.5	no route	Tachometer output	—
W41	OEM-4-X	ME360-C1-26	0.5	no route	Mass air flow (MAF)	—
W42	OEM-4-AE	ME360-C1-56	0.5	no route	Pressure sensor (Mazda: EGR boost sensor)	—
W43	OEM-4-V	ME360-C1-17	0.5	no route	Throttle position (TPS)	—
W44	OEM-4-AA	ME360-C1-18	0.5	no route	Rear O2 signal	—
W45	OEM-4-P	ME360-C1-86	0.5	no route	Coolant temperature (ECT)	—
W46	OEM-4-N	ME360-C1-57	0.5	no route	Intake air temperature (IAT)	—
W47	OEM-3-T	ME360-C1-6	0.5	no route	Vehicle speed	—
W48	OEM-3-S	ME360-C1-7	0.5	no route	Immobiliser	—
W49	OEM-4-B	ME360-C1-8	0.5	no route	Brake switch	—
W50	OEM-4-C	ME360-C1-5	0.5	no route	Power steering pressure switch	—
W51	OEM-4-F	ME360-C1-62	0.5	no route	A/C request	—
W52	OEM-4-H	ME360-C1-34	0.5	no route	Neutral switch	—

Bill of materials

Category	Part number	Manufacturer	Description	Qty	Unit

ECU setup sheet

Role	Engine ref	Engine signal	Sensor	ECU point	ECU function	ECU class	Setup flag
No configured channels.

Findings

Open (10)

Severity	Code	Subject	Message
warn	NET_FAMILY	OEM-2-F ↔ ME360-C1-67	OEM-2-F "EGR valve" [low_side_out] is wired to ME360-C1-67 "Stepper 1 / A1" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way.
warn	NET_FAMILY	OEM-2-H ↔ ME360-C1-68	OEM-2-H "EGR valve" [low_side_out] is wired to ME360-C1-68 "Stepper 2 / A2" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way.
warn	NET_FAMILY	OEM-2-I ↔ ME360-C1-70	OEM-2-I "EGR valve" [low_side_out] is wired to ME360-C1-70 "Stepper 3 / B1" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way.
warn	NET_FAMILY	OEM-2-N ↔ ME360-C1-71	OEM-2-N "VTCS solenoid (intake butterflies)" [low_side_out] is wired to ME360-C1-71 "Stepper 4 / B2" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way.
warn	NET_FAMILY	OEM-2-R ↔ ME360-C1-65	OEM-2-R "Malfunction indicator lamp (MIL)" [low_side_out] is wired to ME360-C1-65 "H-BRIDGE A OUT 1" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way.
warn	NET_FAMILY	OEM-3-E ↔ ME360-C1-66	OEM-3-E "Charcoal canister purge" [low_side_out] is wired to ME360-C1-66 "H-BRIDGE A OUT 2" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way.
warn	NO_BARO_SOURCE	OEM-4-AE	OEM-4-AE reads MAP only after the hose re-route (the stock ECU multiplexed baro + MAP through the EGR boost solenoid). Motorsport Electronics ME360 has no onboard barometric sensor, so add a barometric source: a separate baro sensor on a spare analog input, or a baro-before-crank strategy if the ECU samples its MAP at key-on — see the install notes.
info	NET_FAMILY	OEM-2-E ↔ ME360-C1-58	OEM-2-E "EGR valve" [low_side_out] is wired to ME360-C1-58 "INJECTOR 6" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency.
info	NET_FAMILY	OEM-2-Q ↔ ME360-C1-28	OEM-2-Q "ISC valve low side" [low_side_out] is wired to ME360-C1-28 "INJECTOR 5" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency.
info	UNMAPPED	OEM	8 optional OEM pins are not mapped: OEM-3-D EGR boost solenoid; OEM-3-M Alternator control; OEM-3-U Charge lamp; OEM-4-AD Fuel level; OEM-4-D VVT oil-control solenoid; OEM-4-I Clutch switch; OEM-4-J VTCS vacuum switch; OEM-4-W Front O2 signal

Accepted (1)

Code	Subject	Reason	By
REQUIRED_UNMAPPED	OEM-4-AG	Battery-constant (memory) feed of the stock ECU: the new ECU has no such input, so it is not needed.	mapping-proposal

Notes

Auto-mapped by auto_map() from the library pin data on 2026-10-09. Review every wire against both manuals before building. Not wired: - OEM-4 AG: Constant +12V: Motorsport Electronics ME360 has no battery-constant input; not needed - OEM-3 M: Alternator control: no free low_side/ls_hs/injector/hbridge on Motorsport Electronics ME360 - OEM-3 U: Charge lamp: no free low_side/ls_hs/injector/hbridge on Motorsport Electronics ME360 - OEM-4 D: VVT oil-control solenoid: no free low_side/ls_hs/injector/hbridge on Motorsport Electronics ME360 - OEM-4 W: Front O2 signal: no free o2_narrowband/analog_0_5 on Motorsport Electronics ME360 - OEM-4 AD: Fuel level: no free analog_0_5 on Motorsport Electronics ME360 - OEM-4 I: Clutch switch: no free switch_in/frequency_in/analog_0_5 on Motorsport Electronics ME360 - OEM-4 J: VTCS vacuum switch: no free switch_in/frequency_in/analog_0_5 on Motorsport Electronics ME360 - OEM-3 D: EGR boost solenoid: not classified in the library; wire by hand

Sources

Reliability	Kind	Title	URL	Archive	Captured	SHA-256
4	vendor_doc	Link G4X MX5NB2X install manual (NB2 2001-05)	https://linkecu.com/documentation/MX5XNB2.pdf	archive	2026-10-05	741efdd9f2c8
4	oem_manual	Mazda MX-5 NB2 (2003) wiring diagram — engine / starting / charging	https://web.archive.org/web/20191104195207/http://mellens.net/mazda/mazda_miata_extra_manual/2003_wiring.pdf	—	2026-10-05	5ee0777f12c1
4	vendor_doc	Motorsport Electronics GEN2 ME221/ME360/ME442 wire-in pinout	https://motorsport-electronics.co.uk/onlinehelp/html/ME442ME360ME221GEN2Wire-InPinout.html	—	—	—
2	expert_report	Justin Barrera — Miata NA/NB wiring corrections	—	—	—	—