Honda NSX NA1 1991-2005 (C30A) → DTAFast P8 (auto)

Honda NSX NA1 1991-2005 (C30A) — DTAFast — P8

⚠ NOT CHECKED. Don't build from this.

Drawn by Michael Gnankou · Rev 0 · draft · 2026-10-11

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.

Status	draft · not yet verified: nobody has reported building and running this harness
Open errors	1: read the Findings page before cutting any wire
Size of the job	72 wires · 12 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-A-25	SP-14V-1	0.85	☐	☐	☐	☐	☐	☐	☐
W2	OEM-C-1	SP-14V-1	0.85	☐	☐	☐	☐	☐	☐	☐
W3	SP-14V-1	P8-C1-19	0.85	☐	☐	☐	☐	☐	☐	☐
W4	OEM-A-23	SP-GND-1	0.85	☐	☐	☐	☐	☐	☐	☐
W5	OEM-A-24	SP-GND-1	0.85	☐	☐	☐	☐	☐	☐	☐
W6	OEM-B-2	SP-GND-1	0.85	☐	☐	☐	☐	☐	☐	☐
W7	SP-GND-1	P8-C1-15	0.85	☐	☐	☐	☐	☐	☐	☐
W8	SP-GND-1	P8-C1-34	0.85	☐	☐	☐	☐	☐	☐	☐
W9	SP-GND-1	P8-C1-55	0.85	☐	☐	☐	☐	☐	☐	☐
W10	OEM-A-26	SP-0V-1	0.5	☐	☐	☐	☐	☐	☐	☐
W11	OEM-B-10	SP-0V-1	0.5	☐	☐	☐	☐	☐	☐	☐
W12	OEM-B-12	SP-0V-1	0.5	☐	☐	☐	☐	☐	☐	☐
W13	OEM-B-14	SP-0V-1	0.5	☐	☐	☐	☐	☐	☐	☐
W14	OEM-B-16	SP-0V-1	0.5	☐	☐	☐	☐	☐	☐	☐
W15	OEM-D-21	SP-0V-1	0.5	☐	☐	☐	☐	☐	☐	☐
W16	OEM-D-22	SP-0V-1	0.5	☐	☐	☐	☐	☐	☐	☐
W17	SP-0V-1	P8-C1-46	0.5	☐	☐	☐	☐	☐	☐	☐
W18	SP-0V-1	P8-C1-47	0.5	☐	☐	☐	☐	☐	☐	☐
W19	SP-0V-1	P8-C1-49	0.5	☐	☐	☐	☐	☐	☐	☐
W20	SP-0V-1	P8-C1-51	0.5	☐	☐	☐	☐	☐	☐	☐
W21	OEM-D-18	SP-5V1-1	0.5	☐	☐	☐	☐	☐	☐	☐
W22	OEM-D-19	SP-5V1-1	0.5	☐	☐	☐	☐	☐	☐	☐
W23	OEM-D-20	SP-5V1-1	0.5	☐	☐	☐	☐	☐	☐	☐
W24	SP-5V1-1	P8-C1-10	0.5	☐	☐	☐	☐	☐	☐	☐
W25	OEM-B-15	P8-C1-8	0.5	☐	☐	☐	☐	☐	☐	☐
W26	OEM-B-13	P8-C1-29	0.5	☐	☐	☐	☐	☐	☐	☐
W27	OEM-B-11	P8-C1-27	0.5	☐	☐	☐	☐	☐	☐	☐
W28	OEM-B-9	P8-C1-9	0.5	☐	☐	☐	☐	☐	☐	☐
W29	OEM-A-21	P8-C1-1	0.5	☐	☐	☐	☐	☐	☐	☐
W30	OEM-A-22	P8-C1-38	0.5	☐	☐	☐	☐	☐	☐	☐
W31	OEM-B-8	P8-C1-20	0.5	☐	☐	☐	☐	☐	☐	☐
W32	OEM-B-6	P8-C1-2	0.5	☐	☐	☐	☐	☐	☐	☐
W33	OEM-B-4	P8-C1-39	0.5	☐	☐	☐	☐	☐	☐	☐
W34	OEM-B-3	P8-C1-3	0.5	☐	☐	☐	☐	☐	☐	☐
W35	OEM-A-1	P8-C1-37	0.5	☐	☐	☐	☐	☐	☐	☐
W36	OEM-A-3	P8-C1-18	0.5	☐	☐	☐	☐	☐	☐	☐
W37	OEM-A-5	P8-C1-54	0.5	☐	☐	☐	☐	☐	☐	☐
W38	OEM-A-2	P8-C1-36	0.5	☐	☐	☐	☐	☐	☐	☐
W39	OEM-A-4	P8-C1-17	0.5	☐	☐	☐	☐	☐	☐	☐
W40	OEM-A-6	P8-C1-35	0.5	☐	☐	☐	☐	☐	☐	☐
W41	OEM-A-8	P8-C1-41	0.5	☐	☐	☐	☐	☐	☐	☐
W42	OEM-A-15	P8-C1-5	0.5	☐	☐	☐	☐	☐	☐	☐
W43	OEM-A-18	P8-C1-43	0.5	☐	☐	☐	☐	☐	☐	☐
W44	OEM-A-7	P8-C1-42	0.5	☐	☐	☐	☐	☐	☐	☐
W45	OEM-5-F5	RLY1-R-OUT	0.5	☐	☐	☐	☐	☐	☐	☐
W46	SP-14V-1	RLY1-R-IN	0.5	☐	☐	☐	☐	☐	☐	☐
W47	SP-14V-1	RLY1-R-COIL+	0.5	☐	☐	☐	☐	☐	☐	☐
W48	RLY1-R-COIL-	P8-C1-21	0.5	☐	☐	☐	☐	☐	☐	☐
W49	OEM-5-F7	RLY2-R-OUT	0.5	☐	☐	☐	☐	☐	☐	☐
W50	SP-14V-1	RLY2-R-IN	0.5	☐	☐	☐	☐	☐	☐	☐
W51	SP-14V-1	RLY2-R-COIL+	0.5	☐	☐	☐	☐	☐	☐	☐
W52	RLY2-R-COIL-	P8-C1-23	0.5	☐	☐	☐	☐	☐	☐	☐
W53	OEM-A-10	P8-C1-4	0.5	☐	☐	☐	☐	☐	☐	☐
W54	OEM-A-12	P8-C1-6	0.5	☐	☐	☐	☐	☐	☐	☐
W55	OEM-A-11	P8-C1-53	0.5	☐	☐	☐	☐	☐	☐	☐
W56	OEM-A-13	P8-C1-16	0.5	☐	☐	☐	☐	☐	☐	☐
W57	OEM-C-4	P8-C1-24	0.5	☐	☐	☐	☐	☐	☐	☐
W58	OEM-D-17	P8-C1-30	0.5	☐	☐	☐	☐	☐	☐	☐
W59	OEM-D-11	P8-C1-48	0.5	☐	☐	☐	☐	☐	☐	☐
W60	OEM-D-14	P8-C1-12	0.5	☐	☐	☐	☐	☐	☐	☐
W61	OEM-D-16	P8-C1-25	0.5	☐	☐	☐	☐	☐	☐	☐
W62	OEM-D-13	P8-C1-26	0.5	☐	☐	☐	☐	☐	☐	☐
W63	OEM-D-15	P8-C1-45	0.5	☐	☐	☐	☐	☐	☐	☐
W64	OEM-D-12	P8-C1-7	0.5	☐	☐	☐	☐	☐	☐	☐
W65	OEM-C-2	P8-C1-11	0.5	☐	☐	☐	☐	☐	☐	☐
W66	OEM-D-9	P8-C1-50	0.5	☐	☐	☐	☐	☐	☐	☐
W67	OEM-5-F2	P8-C1-13	0.5	☐	☐	☐	☐	☐	☐	☐
W68	OEM-5-F4	P8-C1-14	0.5	☐	☐	☐	☐	☐	☐	☐
W69	OEM-B-7	P8-C1-31	0.5	☐	☐	☐	☐	☐	☐	☐
W70	OEM-C-11	P8-C1-32	0.5	☐	☐	☐	☐	☐	☐	☐
W71	OEM-C-3	P8-C1-33	0.5	☐	☐	☐	☐	☐	☐	☐
W72	OEM-C-5	P8-C1-44	0.5	☐	☐	☐	☐	☐	☐	☐

Bench test (before first power-up)

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	P8-C1-19	P8-C1-46	open (OL)	+12 V supply must not touch sensor ground
2	P8-C1-10	RLY1-R-OUT	open (OL)	5 V sensor reference must not touch +12 V supply
3	P8-C1-10	RLY2-R-OUT	open (OL)	5 V sensor reference must not touch +12 V supply
4	P8-C1-15	P8-C1-10	open (OL)	power ground must not touch 5 V sensor reference
5	P8-C1-15	P8-C1-19	open (OL)	power ground must not touch +12 V supply
6	P8-C1-15	RLY1-R-OUT	open (OL)	power ground must not touch +12 V supply
7	P8-C1-15	RLY2-R-OUT	open (OL)	power ground must not touch +12 V supply
8	P8-C1-19	P8-C1-10	open (OL)	+12 V supply must not touch 5 V sensor reference
9	P8-C1-46	P8-C1-10	open (OL)	sensor ground must not touch 5 V sensor reference
10	P8-C1-46	RLY1-R-OUT	open (OL)	sensor ground must not touch +12 V supply
11	P8-C1-46	RLY2-R-OUT	open (OL)	sensor ground must not touch +12 V supply

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

Revisions

Rev	Label	By	Date
No revisions yet.

Schematic

Connectors

OEM-5

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
F2	Front VTEC pressure switch	—	W67	—	0.5	P8-C1-13	—	—	—
F4	Rear VTEC pressure switch	—	W68	—	0.5	P8-C1-14	—	—	—
F5	Front VTEC solenoid valve	—	W45	—	0.5	RLY1-R-OUT	—	—	—
F7	Rear VTEC solenoid valve	—	W49	—	0.5	RLY2-R-OUT	—	—	—

OEM-A

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
1	Injector 1	—	W35	—	0.5	P8-C1-37	—	—	—
10	Front O2 sensor heater (HTCNTF)	—	W53	—	0.5	P8-C1-4	—	—	—
11	EGR control solenoid	—	W55	—	0.5	P8-C1-53	—	—	—
12	Rear O2 sensor heater (HTCNTR)	—	W54	—	0.5	P8-C1-6	—	—	—
13	Check engine light (WARN)	—	W56	—	0.5	P8-C1-16	—	—	—
14	Chamber volume control solenoid (BPS)	—	—	—	—	—	—	—	—
15	A/C clutch relay (ACC)	—	W42	—	0.5	P8-C1-5	—	—	—
18	Radiator fan control (FANCNTR)	—	W43	—	0.5	P8-C1-43	—	—	—
2	Injector 4	—	W38	—	0.5	P8-C1-36	—	—	—
20	EVAP purge cut-off solenoid (PGS)	—	—	—	—	—	—	—	—
21	Ignition coil 1	—	W29	—	0.5	P8-C1-1	—	—	—
22	Ignition coil 2	—	W30	—	0.5	P8-C1-38	—	—	—
23	Power ground (PG1)	—	W4	—	0.85	SP-GND-1	—	—	—
24	Power ground (PG2)	—	W5	—	0.85	SP-GND-1	—	—	—
25	ECU power (IGP1)	—	W1	—	0.85	SP-14V-1	—	—	—
26	Sensor ground (LG1)	—	W10	—	0.5	SP-0V-1	—	—	—
3	Injector 2	—	W36	—	0.5	P8-C1-18	—	—	—
4	Injector 5	—	W39	—	0.5	P8-C1-17	—	—	—
5	Injector 3	—	W37	—	0.5	P8-C1-54	—	—	—
6	Injector 6	—	W40	—	0.5	P8-C1-35	—	—	—
7	Main relay	—	W44	—	0.5	P8-C1-42	—	—	—
8	Fuel pump relay 2 (FLR2)	—	W41	—	0.5	P8-C1-41	—	—	—
9	Idle air control valve (IACV)	—	—	—	—	—	—	—	—

OEM-B

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
10	CYL 2M — CYP sensor 2 return	—	W11	—	0.5	SP-0V-1	—	—	—
11	CYL 1P — CYP sensor 1 signal	—	W27	—	0.5	P8-C1-27	—	—	—
12	CYL 1M — CYP sensor 1 return	—	W12	—	0.5	SP-0V-1	—	—	—
13	CRNK 2P — TDC sensor signal	—	W26	—	0.5	P8-C1-29	—	—	—
14	CRNK 2M — TDC sensor return	—	W13	—	0.5	SP-0V-1	—	—	—
15	CRNK 1P — crank sensor signal	—	W25	—	0.5	P8-C1-8	—	—	—
16	CRNK 1M — crank sensor return	—	W14	—	0.5	SP-0V-1	—	—	—
2	Chassis ground (LG2)	—	W6	—	0.85	SP-GND-1	—	—	—
3	Ignition coil 6	—	W34	—	0.5	P8-C1-3	—	—	—
4	Ignition coil 5	—	W33	—	0.5	P8-C1-39	—	—	—
6	Ignition coil 4	—	W32	—	0.5	P8-C1-2	—	—	—
7	Neutral switch (M/T) / gear position (A/T)	—	W69	—	0.5	P8-C1-31	—	—	—
8	Ignition coil 3	—	W31	—	0.5	P8-C1-20	—	—	—
9	CYL 2P — CYP sensor 2 signal	—	W28	—	0.5	P8-C1-9	—	—	—

OEM-C

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
1	ECU power (IGP2)	—	W2	—	0.85	SP-14V-1	—	—	—
10	Traction control	—	—	—	—	—	—	—	—
11	Starter switch (STS)	—	W70	—	0.5	P8-C1-32	—	—	—
12	Traction control	—	—	—	—	—	—	—	—
2	Vehicle speed sensor (VSS)	—	W65	—	0.5	P8-C1-11	—	—	—
3	A/C switch (ACS)	—	W71	—	0.5	P8-C1-33	—	—	—
4	Tachometer output (NEP)	—	W57	—	0.5	P8-C1-24	—	—	—
5	A/C pressure switch (PDSW)	—	W72	—	0.5	P8-C1-44	—	—	—
6	Traction control	—	—	—	—	—	—	—	—
7	Clutch switch (M/T)	—	—	—	—	—	—	—	—
8	Traction control	—	—	—	—	—	—	—	—
9	Service check connector (SCS)	—	—	—	—	—	—	—	—

OEM-D

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
1	Battery backup (VBU)	—	—	—	—	—	—	—	—
11	Throttle position sensor (TPS)	—	W59	—	0.5	P8-C1-48	—	—	—
12	EGR lift sensor (EGRL)	—	W64	—	0.5	P8-C1-7	—	—	—
13	Engine coolant temperature (ECT)	—	W62	—	0.5	P8-C1-26	—	—	—
14	Primary O2 sensor	—	W60	—	0.5	P8-C1-12	—	—	—
15	Intake air temperature (IAT)	—	W63	—	0.5	P8-C1-45	—	—	—
16	Secondary O2 sensor	—	W61	—	0.5	P8-C1-25	—	—	—
17	MAP sensor	—	W58	—	0.5	P8-C1-30	—	—	—
18	+5V sensor supply (VCC)	—	W21	—	0.5	SP-5V1-1	—	—	—
19	+5V sensor supply (VCC)	—	W22	—	0.5	SP-5V1-1	—	—	—
20	+5V sensor supply (VCC)	—	W23	—	0.5	SP-5V1-1	—	—	—
21	Sensor ground (SG)	—	W15	—	0.5	SP-0V-1	—	—	—
22	Sensor ground (SG)	—	W16	—	0.5	SP-0V-1	—	—	—
3	Knock sensor — rear	—	—	—	—	—	—	—	—
4	Knock sensor — front	—	—	—	—	—	—	—	—
5	Traction control	—	—	—	—	—	—	—	—
6	Fuel pump voltage monitor (VFP)	—	—	—	—	—	—	—	—
8	Ignition timing adjuster (IGADJ)	—	—	—	—	—	—	—	—
9	Alternator FR signal	—	W66	—	0.5	P8-C1-50	—	—	—

P8-C1

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
1	Coil 1	—	W29	—	0.5	OEM-A-21	—	—	—
10	5 Volts	—	W24	—	0.5	SP-5V1-1	—	—	—
11	Undriven Wheel (must)	—	W65	—	0.5	OEM-C-2	—	—	—
12	Lambda Signal	—	W60	—	0.5	OEM-D-14	—	—	—
13	Map2/ALS/Ana1 On/Off	—	W67	—	0.5	OEM-5-F2	—	—	—
14	Traction Wet/Dry	—	W68	—	0.5	OEM-5-F4	—	—	—
15	Power Ground	—	W7	—	0.85	SP-GND-1	—	—	—
16	Injector 8	—	W56	—	0.5	OEM-A-13	—	—	—
17	Injector 5	—	W39	—	0.5	OEM-A-4	—	—	—
18	Injector 2	—	W36	—	0.5	OEM-A-3	—	—	—
19	12 Volts	—	W3	—	0.85	SP-14V-1	—	—	—
2	Coil 4	—	W32	—	0.5	OEM-B-6	—	—	—
20	Coil 3	—	W31	—	0.5	OEM-B-8	—	—	—
21	Turbo Pressure Valve	—	W48	—	0.5	RLY1-R-COIL-	—	—	—
22	Coil 8/or Aux5	—	—	—	—	—	—	—	—
23	Turbo ALS Valve	—	W52	—	0.5	RLY2-R-COIL-	—	—	—
24	Tacho	—	W57	—	0.5	OEM-C-4	—	—	—
25	Analogue Input 1	—	W61	—	0.5	OEM-D-16	—	—	—
26	Water Temp	—	W62	—	0.5	OEM-D-13	—	—	—
27	Cam Sensor	—	W27	—	0.5	OEM-B-11	—	—	—
28	5 Volts	—	—	—	—	—	—	—	—
29	Left Driven Wheel	—	W26	—	0.5	OEM-B-13	—	—	—
3	Coil 6	—	W34	—	0.5	OEM-B-3	—	—	—
30	Map	—	W58	—	0.5	OEM-D-17	—	—	—
31	Launch Button	—	W69	—	0.5	OEM-B-7	—	—	—
32	Traction On/Off	—	W70	—	0.5	OEM-C-11	—	—	—
33	Shift Cut	—	W71	—	0.5	OEM-C-3	—	—	—
34	Power Ground	—	W8	—	0.85	SP-GND-1	—	—	—
35	Injector 6	—	W40	—	0.5	OEM-A-6	—	—	—
36	Injector 4	—	W38	—	0.5	OEM-A-2	—	—	—
37	Injector 1	—	W35	—	0.5	OEM-A-1	—	—	—
38	Coil 2	—	W30	—	0.5	OEM-A-22	—	—	—
39	Coil 5	—	W33	—	0.5	OEM-B-4	—	—	—
4	Idle Valve	—	W53	—	0.5	OEM-A-10	—	—	—
40	Coil 7	—	—	—	—	—	—	—	—
41	Fuel Pump Relay	—	W41	—	0.5	OEM-A-8	—	—	—
42	Cam Phase Valve/Aux Out 4	—	W44	—	0.5	OEM-A-7	—	—	—
43	Aux Out 3	—	W43	—	0.5	OEM-A-18	—	—	—
44	Analogue Input 3	—	W72	—	0.5	OEM-C-5	—	—	—
45	Air Temp	—	W63	—	0.5	OEM-D-15	—	—	—
46	Signal Ground	—	W17	—	0.5	SP-0V-1	—	—	—
47	Signal Ground	—	W18	—	0.5	SP-0V-1	—	—	—
48	Throttle Wiper	—	W59	—	0.5	OEM-D-11	—	—	—
49	Lambda Earth	—	W19	—	0.5	SP-0V-1	—	—	—
5	Aux Out 2	—	W42	—	0.5	OEM-A-15	—	—	—
50	Undriven Wheel (optional)	—	W66	—	0.5	OEM-D-9	—	—	—
51	Signal Ground	—	W20	—	0.5	SP-0V-1	—	—	—
52	5 Volts	—	—	—	—	—	—	—	—
53	Injector 7	—	W55	—	0.5	OEM-A-11	—	—	—
54	Injector 3	—	W37	—	0.5	OEM-A-5	—	—	—
55	Power Ground	—	W9	—	0.85	SP-GND-1	—	—	—
6	Shift Light	—	W54	—	0.5	OEM-A-12	—	—	—
7	Analogue Input 2 Or Log Switch	—	W64	—	0.5	OEM-D-12	—	—	—
8	Crank Sensor	—	W25	—	0.5	OEM-B-15	—	—	—
9	Right Driven Wheel	—	W28	—	0.5	OEM-B-9	—	—	—

RLY1-R

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
COIL+	Relay coil positive (switched +12 V)	—	W47	—	0.5	SP-14V-1	—	—	—
COIL-	Relay coil negative (ECU low-side driver)	—	W48	—	0.5	P8-C1-21	—	—	—
IN	Relay contact input (switched +12 V)	—	W46	—	0.5	SP-14V-1	—	—	—
OUT	Relay contact output (switched +12 V to load)	—	W45	—	0.5	OEM-5-F5	—	—	—

RLY2-R

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
COIL+	Relay coil positive (switched +12 V)	—	W51	—	0.5	SP-14V-1	—	—	—
COIL-	Relay coil negative (ECU low-side driver)	—	W52	—	0.5	P8-C1-23	—	—	—
IN	Relay contact input (switched +12 V)	—	W50	—	0.5	SP-14V-1	—	—	—
OUT	Relay contact output (switched +12 V to load)	—	W49	—	0.5	OEM-5-F7	—	—	—

SP-0V

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
1	—	—	W10	—	0.5	OEM-A-26	—	—	—
1	—	—	W11	—	0.5	OEM-B-10	—	—	—
1	—	—	W12	—	0.5	OEM-B-12	—	—	—
1	—	—	W13	—	0.5	OEM-B-14	—	—	—
1	—	—	W14	—	0.5	OEM-B-16	—	—	—
1	—	—	W15	—	0.5	OEM-D-21	—	—	—
1	—	—	W16	—	0.5	OEM-D-22	—	—	—
1	—	—	W17	—	0.5	P8-C1-46	—	—	—
1	—	—	W18	—	0.5	P8-C1-47	—	—	—
1	—	—	W19	—	0.5	P8-C1-49	—	—	—
1	—	—	W20	—	0.5	P8-C1-51	—	—	—

SP-14V

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
1	—	—	W1	—	0.85	OEM-A-25	—	—	—
1	—	—	W2	—	0.85	OEM-C-1	—	—	—
1	—	—	W3	—	0.85	P8-C1-19	—	—	—
1	—	—	W46	—	0.5	RLY1-R-IN	—	—	—
1	—	—	W47	—	0.5	RLY1-R-COIL+	—	—	—
1	—	—	W50	—	0.5	RLY2-R-IN	—	—	—
1	—	—	W51	—	0.5	RLY2-R-COIL+	—	—	—

SP-5V1

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
1	—	—	W21	—	0.5	OEM-D-18	—	—	—
1	—	—	W22	—	0.5	OEM-D-19	—	—	—
1	—	—	W23	—	0.5	OEM-D-20	—	—	—
1	—	—	W24	—	0.5	P8-C1-10	—	—	—

SP-GND

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
1	—	—	W4	—	0.85	OEM-A-23	—	—	—
1	—	—	W5	—	0.85	OEM-A-24	—	—	—
1	—	—	W6	—	0.85	OEM-B-2	—	—	—
1	—	—	W7	—	0.85	P8-C1-15	—	—	—
1	—	—	W8	—	0.85	P8-C1-34	—	—	—
1	—	—	W9	—	0.85	P8-C1-55	—	—	—

Pin map

OEM point	OEM function	OEM family	Target point	Target function	Target family	Evidence
OEM-5-F2	Front VTEC pressure switch	digital_in	P8-C1-13	Map2/ALS/Ana1 On/Off	digital_in	single_source
OEM-5-F4	Rear VTEC pressure switch	digital_in	P8-C1-14	Traction Wet/Dry	digital_in	single_source
OEM-5-F5	Front VTEC solenoid valve	high_side_out	RLY1-R-OUT	Relay contact output (switched +12 V to load)	power_out	single_source
OEM-5-F7	Rear VTEC solenoid valve	high_side_out	RLY2-R-OUT	Relay contact output (switched +12 V to load)	power_out	single_source
OEM-A-1	Injector 1	injector_out	P8-C1-37	Injector 1	injector_out	single_source
OEM-A-10	Front O2 sensor heater (HTCNTF)	low_side_out	P8-C1-4	Idle Valve	low_side_out	single_source
OEM-A-11	EGR control solenoid	low_side_out	P8-C1-53	Injector 7	injector_out	single_source
OEM-A-12	Rear O2 sensor heater (HTCNTR)	low_side_out	P8-C1-6	Shift Light	low_side_out	single_source
OEM-A-13	Check engine light (WARN)	low_side_out	P8-C1-16	Injector 8	injector_out	single_source
OEM-A-14	Chamber volume control solenoid (BPS)	low_side_out	—	—	—	single_source
OEM-A-15	A/C clutch relay (ACC)	low_side_out	P8-C1-5	Aux Out 2	low_side_out	single_source
OEM-A-18	Radiator fan control (FANCNTR)	low_side_out	P8-C1-43	Aux Out 3	low_side_out	single_source
OEM-A-2	Injector 4	injector_out	P8-C1-36	Injector 4	injector_out	single_source
OEM-A-20	EVAP purge cut-off solenoid (PGS)	low_side_out	—	—	—	single_source
OEM-A-21	Ignition coil 1	ignition_out	P8-C1-1	Coil 1	ignition_out	single_source
OEM-A-22	Ignition coil 2	ignition_out	P8-C1-38	Coil 2	ignition_out	single_source
OEM-A-23	Power ground (PG1)	ground	P8-C1-15 + P8-C1-34 + P8-C1-55	Power Ground + Power Ground + Power Ground	ground	single_source
OEM-A-24	Power ground (PG2)	ground	P8-C1-15 + P8-C1-34 + P8-C1-55	Power Ground + Power Ground + Power Ground	ground	single_source
OEM-A-25	ECU power (IGP1)	power_in	P8-C1-19 + RLY1-R-COIL+ + RLY1-R-IN + RLY2-R-COIL+ + RLY2-R-IN	12 Volts + Relay coil positive (switched +12 V) + Relay contact input (switched +12 V) + Relay coil positive (switched +12 V) + Relay contact input (switched +12 V)	power_in + power_out	single_source
OEM-A-26	Sensor ground (LG1)	sensor_ground	P8-C1-46 + P8-C1-47 + P8-C1-49 + P8-C1-51	Signal Ground + Signal Ground + Lambda Earth + Signal Ground	sensor_ground	single_source
OEM-A-3	Injector 2	injector_out	P8-C1-18	Injector 2	injector_out	single_source
OEM-A-4	Injector 5	injector_out	P8-C1-17	Injector 5	injector_out	corroborated
OEM-A-5	Injector 3	injector_out	P8-C1-54	Injector 3	injector_out	single_source
OEM-A-6	Injector 6	injector_out	P8-C1-35	Injector 6	injector_out	single_source
OEM-A-7	Main relay	low_side_out	P8-C1-42	Cam Phase Valve/Aux Out 4	low_side_out	single_source
OEM-A-8	Fuel pump relay 2 (FLR2)	low_side_out	P8-C1-41	Fuel Pump Relay	low_side_out	single_source
OEM-A-9	Idle air control valve (IACV)	low_side_out	—	—	—	single_source
OEM-B-10	CYL 2M — CYP sensor 2 return	sensor_ground	P8-C1-46 + P8-C1-47 + P8-C1-49 + P8-C1-51	Signal Ground + Signal Ground + Lambda Earth + Signal Ground	sensor_ground	single_source
OEM-B-11	CYL 1P — CYP sensor 1 signal	trigger_in	P8-C1-27	Cam Sensor	trigger_in	single_source
OEM-B-12	CYL 1M — CYP sensor 1 return	sensor_ground	P8-C1-46 + P8-C1-47 + P8-C1-49 + P8-C1-51	Signal Ground + Signal Ground + Lambda Earth + Signal Ground	sensor_ground	single_source
OEM-B-13	CRNK 2P — TDC sensor signal	trigger_in	P8-C1-29	Left Driven Wheel	digital_in	single_source
OEM-B-14	CRNK 2M — TDC sensor return	sensor_ground	P8-C1-46 + P8-C1-47 + P8-C1-49 + P8-C1-51	Signal Ground + Signal Ground + Lambda Earth + Signal Ground	sensor_ground	single_source
OEM-B-15	CRNK 1P — crank sensor signal	trigger_in	P8-C1-8	Crank Sensor	trigger_in	single_source
OEM-B-16	CRNK 1M — crank sensor return	sensor_ground	P8-C1-46 + P8-C1-47 + P8-C1-49 + P8-C1-51	Signal Ground + Signal Ground + Lambda Earth + Signal Ground	sensor_ground	single_source
OEM-B-2	Chassis ground (LG2)	ground	P8-C1-15 + P8-C1-34 + P8-C1-55	Power Ground + Power Ground + Power Ground	ground	single_source
OEM-B-3	Ignition coil 6	ignition_out	P8-C1-3	Coil 6	ignition_out	single_source
OEM-B-4	Ignition coil 5	ignition_out	P8-C1-39	Coil 5	ignition_out	single_source
OEM-B-6	Ignition coil 4	ignition_out	P8-C1-2	Coil 4	ignition_out	single_source
OEM-B-7	Neutral switch (M/T) / gear position (A/T)	digital_in	P8-C1-31	Launch Button	digital_in	single_source
OEM-B-8	Ignition coil 3	ignition_out	P8-C1-20	Coil 3	ignition_out	single_source
OEM-B-9	CYL 2P — CYP sensor 2 signal	trigger_in	P8-C1-9	Right Driven Wheel	digital_in	single_source
OEM-C-1	ECU power (IGP2)	power_in	P8-C1-19 + RLY1-R-COIL+ + RLY1-R-IN + RLY2-R-COIL+ + RLY2-R-IN	12 Volts + Relay coil positive (switched +12 V) + Relay contact input (switched +12 V) + Relay coil positive (switched +12 V) + Relay contact input (switched +12 V)	power_in + power_out	single_source
OEM-C-10	Traction control	—	—	—	—	single_source
OEM-C-11	Starter switch (STS)	digital_in	P8-C1-32	Traction On/Off	digital_in	single_source
OEM-C-12	Traction control	—	—	—	—	single_source
OEM-C-2	Vehicle speed sensor (VSS)	digital_in	P8-C1-11	Undriven Wheel (must)	digital_in	single_source
OEM-C-3	A/C switch (ACS)	digital_in	P8-C1-33	Shift Cut	digital_in	single_source
OEM-C-4	Tachometer output (NEP)	tacho_out	P8-C1-24	Tacho	tacho_out	single_source
OEM-C-5	A/C pressure switch (PDSW)	digital_in	P8-C1-44	Analogue Input 3	analog_in	single_source
OEM-C-6	Traction control	—	—	—	—	single_source
OEM-C-7	Clutch switch (M/T)	digital_in	—	—	—	single_source
OEM-C-8	Traction control	—	—	—	—	single_source
OEM-C-9	Service check connector (SCS)	digital_in	—	—	—	single_source
OEM-D-1	Battery backup (VBU)	power_in	—	—	—	single_source
OEM-D-11	Throttle position sensor (TPS)	analog_in	P8-C1-48	Throttle Wiper	analog_in	single_source
OEM-D-12	EGR lift sensor (EGRL)	analog_in	P8-C1-7	Analogue Input 2 Or Log Switch	analog_in	single_source
OEM-D-13	Engine coolant temperature (ECT)	temp_in	P8-C1-26	Water Temp	temp_in	single_source
OEM-D-14	Primary O2 sensor	lambda_nb_in	P8-C1-12	Lambda Signal	lambda_nb_in	single_source
OEM-D-15	Intake air temperature (IAT)	temp_in	P8-C1-45	Air Temp	temp_in	single_source
OEM-D-16	Secondary O2 sensor	lambda_nb_in	P8-C1-25	Analogue Input 1	analog_in	single_source
OEM-D-17	MAP sensor	analog_in	P8-C1-30	Map	analog_in	single_source
OEM-D-18	+5V sensor supply (VCC)	vref	P8-C1-10	5 Volts	vref	single_source
OEM-D-19	+5V sensor supply (VCC)	vref	P8-C1-10	5 Volts	vref	single_source
OEM-D-20	+5V sensor supply (VCC)	vref	P8-C1-10	5 Volts	vref	single_source
OEM-D-21	Sensor ground (SG)	sensor_ground	P8-C1-46 + P8-C1-47 + P8-C1-49 + P8-C1-51	Signal Ground + Signal Ground + Lambda Earth + Signal Ground	sensor_ground	single_source
OEM-D-22	Sensor ground (SG)	sensor_ground	P8-C1-46 + P8-C1-47 + P8-C1-49 + P8-C1-51	Signal Ground + Signal Ground + Lambda Earth + Signal Ground	sensor_ground	single_source
OEM-D-3	Knock sensor — rear	knock_in	—	—	—	single_source
OEM-D-4	Knock sensor — front	knock_in	—	—	—	single_source
OEM-D-5	Traction control	—	—	—	—	single_source
OEM-D-6	Fuel pump voltage monitor (VFP)	—	—	—	—	corroborated
OEM-D-8	Ignition timing adjuster (IGADJ)	digital_in	—	—	—	single_source
OEM-D-9	Alternator FR signal	digital_in	P8-C1-50	Undriven Wheel (optional)	digital_in	single_source

Cut list

Wire	From	To	Gauge (mm²)	Length	Signal	Ident
W1	OEM-A-25	SP-14V-1	0.85	no route	ECU power (IGP1)	—
W2	OEM-C-1	SP-14V-1	0.85	no route	ECU power (IGP2)	—
W3	SP-14V-1	P8-C1-19	0.85	no route	12 Volts	—
W4	OEM-A-23	SP-GND-1	0.85	no route	Power ground (PG1)	—
W5	OEM-A-24	SP-GND-1	0.85	no route	Power ground (PG2)	—
W6	OEM-B-2	SP-GND-1	0.85	no route	Chassis ground (LG2)	—
W7	SP-GND-1	P8-C1-15	0.85	no route	Power Ground	—
W8	SP-GND-1	P8-C1-34	0.85	no route	Power Ground	—
W9	SP-GND-1	P8-C1-55	0.85	no route	Power Ground	—
W10	OEM-A-26	SP-0V-1	0.5	no route	Sensor ground (LG1)	—
W11	OEM-B-10	SP-0V-1	0.5	no route	CYL 2M — CYP sensor 2 return	—
W12	OEM-B-12	SP-0V-1	0.5	no route	CYL 1M — CYP sensor 1 return	—
W13	OEM-B-14	SP-0V-1	0.5	no route	CRNK 2M — TDC sensor return	—
W14	OEM-B-16	SP-0V-1	0.5	no route	CRNK 1M — crank sensor return	—
W15	OEM-D-21	SP-0V-1	0.5	no route	Sensor ground (SG)	—
W16	OEM-D-22	SP-0V-1	0.5	no route	Sensor ground (SG)	—
W17	SP-0V-1	P8-C1-46	0.5	no route	Signal Ground	—
W18	SP-0V-1	P8-C1-47	0.5	no route	Signal Ground	—
W19	SP-0V-1	P8-C1-49	0.5	no route	Lambda Earth	—
W20	SP-0V-1	P8-C1-51	0.5	no route	Signal Ground	—
W21	OEM-D-18	SP-5V1-1	0.5	no route	+5V sensor supply (VCC)	—
W22	OEM-D-19	SP-5V1-1	0.5	no route	+5V sensor supply (VCC)	—
W23	OEM-D-20	SP-5V1-1	0.5	no route	+5V sensor supply (VCC)	—
W24	SP-5V1-1	P8-C1-10	0.5	no route	5 Volts	—
W25	OEM-B-15	P8-C1-8	0.5	no route	CRNK 1P — crank sensor signal	—
W26	OEM-B-13	P8-C1-29	0.5	no route	CRNK 2P — TDC sensor signal	—
W27	OEM-B-11	P8-C1-27	0.5	no route	CYL 1P — CYP sensor 1 signal	—
W28	OEM-B-9	P8-C1-9	0.5	no route	CYL 2P — CYP sensor 2 signal	—
W29	OEM-A-21	P8-C1-1	0.5	no route	Ignition coil 1	—
W30	OEM-A-22	P8-C1-38	0.5	no route	Ignition coil 2	—
W31	OEM-B-8	P8-C1-20	0.5	no route	Ignition coil 3	—
W32	OEM-B-6	P8-C1-2	0.5	no route	Ignition coil 4	—
W33	OEM-B-4	P8-C1-39	0.5	no route	Ignition coil 5	—
W34	OEM-B-3	P8-C1-3	0.5	no route	Ignition coil 6	—
W35	OEM-A-1	P8-C1-37	0.5	no route	Injector 1	—
W36	OEM-A-3	P8-C1-18	0.5	no route	Injector 2	—
W37	OEM-A-5	P8-C1-54	0.5	no route	Injector 3	—
W38	OEM-A-2	P8-C1-36	0.5	no route	Injector 4	—
W39	OEM-A-4	P8-C1-17	0.5	no route	Injector 5	—
W40	OEM-A-6	P8-C1-35	0.5	no route	Injector 6	—
W41	OEM-A-8	P8-C1-41	0.5	no route	Fuel pump relay 2 (FLR2)	—
W42	OEM-A-15	P8-C1-5	0.5	no route	A/C clutch relay (ACC)	—
W43	OEM-A-18	P8-C1-43	0.5	no route	Radiator fan control (FANCNTR)	—
W44	OEM-A-7	P8-C1-42	0.5	no route	Main relay	—
W45	OEM-5-F5	RLY1-R-OUT	0.5	no route	Front VTEC solenoid valve	—
W46	SP-14V-1	RLY1-R-IN	0.5	no route	Relay contact input (switched +12 V)	—
W47	SP-14V-1	RLY1-R-COIL+	0.5	no route	Relay coil positive (switched +12 V)	—
W48	RLY1-R-COIL-	P8-C1-21	0.5	no route	Relay coil negative (ECU low-side driver)	—
W49	OEM-5-F7	RLY2-R-OUT	0.5	no route	Rear VTEC solenoid valve	—
W50	SP-14V-1	RLY2-R-IN	0.5	no route	Relay contact input (switched +12 V)	—
W51	SP-14V-1	RLY2-R-COIL+	0.5	no route	Relay coil positive (switched +12 V)	—
W52	RLY2-R-COIL-	P8-C1-23	0.5	no route	Relay coil negative (ECU low-side driver)	—
W53	OEM-A-10	P8-C1-4	0.5	no route	Front O2 sensor heater (HTCNTF)	—
W54	OEM-A-12	P8-C1-6	0.5	no route	Rear O2 sensor heater (HTCNTR)	—
W55	OEM-A-11	P8-C1-53	0.5	no route	EGR control solenoid	—
W56	OEM-A-13	P8-C1-16	0.5	no route	Check engine light (WARN)	—
W57	OEM-C-4	P8-C1-24	0.5	no route	Tachometer output (NEP)	—
W58	OEM-D-17	P8-C1-30	0.5	no route	MAP sensor	—
W59	OEM-D-11	P8-C1-48	0.5	no route	Throttle position sensor (TPS)	—
W60	OEM-D-14	P8-C1-12	0.5	no route	Primary O2 sensor	—
W61	OEM-D-16	P8-C1-25	0.5	no route	Secondary O2 sensor	—
W62	OEM-D-13	P8-C1-26	0.5	no route	Engine coolant temperature (ECT)	—
W63	OEM-D-15	P8-C1-45	0.5	no route	Intake air temperature (IAT)	—
W64	OEM-D-12	P8-C1-7	0.5	no route	EGR lift sensor (EGRL)	—
W65	OEM-C-2	P8-C1-11	0.5	no route	Vehicle speed sensor (VSS)	—
W66	OEM-D-9	P8-C1-50	0.5	no route	Alternator FR signal	—
W67	OEM-5-F2	P8-C1-13	0.5	no route	Front VTEC pressure switch	—
W68	OEM-5-F4	P8-C1-14	0.5	no route	Rear VTEC pressure switch	—
W69	OEM-B-7	P8-C1-31	0.5	no route	Neutral switch (M/T) / gear position (A/T)	—
W70	OEM-C-11	P8-C1-32	0.5	no route	Starter switch (STS)	—
W71	OEM-C-3	P8-C1-33	0.5	no route	A/C switch (ACS)	—
W72	OEM-C-5	P8-C1-44	0.5	no route	A/C pressure switch (PDSW)	—

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 (7)

Severity	Code	Subject	Message
error	INJECTOR_BALLAST	P8	The C30A injectors (NSX fuel injector) are low-impedance, but P8 drives saturated (high-Z) injectors only. Add a ballast resistor pack in series with each injector, or use an ECU with low-Z / peak-and-hold injector drivers.
warn	NET_FAMILY	OEM-B-13 ↔ P8-C1-29	OEM-B-13 "CRNK 2P — TDC sensor signal" [trigger_in] is wired to P8-C1-29 "Left Driven Wheel" [digital_in]. Hall-type cam/speed signals can use a digital input if it handles the frequency; VR signals cannot.
warn	NET_FAMILY	OEM-B-9 ↔ P8-C1-9	OEM-B-9 "CYL 2P — CYP sensor 2 signal" [trigger_in] is wired to P8-C1-9 "Right Driven Wheel" [digital_in]. Hall-type cam/speed signals can use a digital input if it handles the frequency; VR signals cannot.
warn	NET_FAMILY	OEM-C-5 ↔ P8-C1-44	OEM-C-5 "A/C pressure switch (PDSW)" [digital_in] is wired to P8-C1-44 "Analogue Input 3" [analog_in]. Analog and digital on one net. A switch on an analog input works with a pull-up and a threshold; an analog sensor on a digital input loses its value.
info	NET_FAMILY	OEM-A-11 ↔ P8-C1-53	OEM-A-11 "EGR control solenoid" [low_side_out] is wired to P8-C1-53 "Injector 7" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency.
info	NET_FAMILY	OEM-A-13 ↔ P8-C1-16	OEM-A-13 "Check engine light (WARN)" [low_side_out] is wired to P8-C1-16 "Injector 8" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency.
info	UNMAPPED	OEM	14 optional OEM pins are not mapped: OEM-A-14 Chamber volume control solenoid (BPS); OEM-A-20 EVAP purge cut-off solenoid (PGS); OEM-A-9 Idle air control valve (IACV); OEM-C-10 Traction control; OEM-C-12 Traction control; OEM-C-6 Traction control; OEM-C-7 Clutch switch (M/T); OEM-C-8 Traction control; OEM-C-9 Service check connector (SCS); OEM-D-3 Knock sensor — rear; OEM-D-4 Knock sensor — front; OEM-D-5 Traction control; OEM-D-6 Fuel pump voltage monitor (VFP); OEM-D-8 Ignition timing adjuster (IGADJ)

Accepted (1)

Code	Subject	Reason	By
REQUIRED_UNMAPPED	OEM-D-1	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 2026-10-11. Review every wire against both manuals before building. Not wired: - OEM-D 1: Battery backup (VBU): DTAFast P8 has no battery-constant input; not needed - OEM-D 4: Knock sensor — front: no free knock input on DTAFast P8 - OEM-D 3: Knock sensor — rear: no free knock input on DTAFast P8 - OEM-A 14: Chamber volume control solenoid (BPS): no free low_side/ls_hs/injector/hbridge on DTAFast P8 - OEM-A 20: EVAP purge cut-off solenoid (PGS): no free low_side/ls_hs/injector/hbridge on DTAFast P8 - OEM-A 9: Idle air control valve (IACV): no free low_side/ls_hs/injector/hbridge on DTAFast P8 - OEM-C 7: Clutch switch (M/T): no free switch_in/frequency_in/analog_0_5 on DTAFast P8 - OEM-C 9: Service check connector (SCS): no free switch_in/frequency_in/analog_0_5 on DTAFast P8 - OEM-D 8: Ignition timing adjuster (IGADJ): no free switch_in/frequency_in/analog_0_5 on DTAFast P8 - OEM-C 10: Traction control: not classified in the library; wire by hand - OEM-C 12: Traction control: not classified in the library; wire by hand - OEM-C 6: Traction control: not classified in the library; wire by hand - OEM-C 8: Traction control: not classified in the library; wire by hand - OEM-D 5: Traction control: not classified in the library; wire by hand - OEM-D 6: Fuel pump voltage monitor (VFP): not classified in the library; wire by hand

Sources

Reliability	Kind	Title	URL	Archive	Captured	SHA-256
4	vendor_doc	AEM EMS 30-1042 (Series 1) plug-and-play install manual — 1991-94 NSX	https://fancy-craft.firebaseapp.com/NSX/report/ecu/EMS_-_30-1042.pdf	archive	2026-10-05	0cad10bc64b5
4	vendor_doc	Bosch relay catalogue (mini ISO relays)	https://www.bosch-ibusiness.com/media/downloads/kataloge/relay/2025_10_bosch_relay_catalogue.pdf	archive	2026-10-05	20344cff1ef3
4	vendor_doc	DTAFast P8Pro wiring schematic	https://dtafast.co.uk/pages/ecu-wiring-diagrams	—	—	—
4	community_copy	Honda S2000 Service Manual 2000–2008, Fuel and Emissions Systems	https://www.s2000.wiki/view/images/7/7f/Service_Manual_2000-2008.pdf	archive	2026-10-05	a470cfc928e9
4	vendor_doc	Omron G8V-RH-1C7T-R-DC12 high-current micro 280 automotive relay datasheet	https://www.alldatasheet.com/datasheet-pdf/pdf/333797/OMRON/G8V-RH-1C7T-R-DC12.html	—	2026-10-05	764a0505a941
3	vendor_doc	dodo-upgrades: Honda OBD1 V6 ECU pinout	https://dodo-upgrades.nl/index.php/obd1-v6-pinouts/	archive	2026-10-05	f9539af28904