Honda NSX NA1 1991-2005 (C30A) → FuelTech FT450 (auto)
Honda NSX NA1 1991-2005 (C30A) — FuelTech — FT450
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 2026-10-12
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 | 5: read the Findings page before cutting any wire |
| Size of the job | 44 wires · 10 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 | Colour | 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 | FT450-A-A13 | 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 | FT450-A-A7 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | OEM-A-26 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-B-10 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-B-12 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-B-14 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-B-16 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-D-21 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-D-22 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | SP-0V-1 | FT450-A-A12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-D-18 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-D-19 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-D-20 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | SP-5V1-1 | FT450-A-A14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-B-15 | FT450-A-A18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | SP-0V-1 | FT450-A-A18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-B-13 | FT450-A-A19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-B-11 | FT450-A-A17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-A-21 | FT450-A-A8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-A-22 | FT450-A-A9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-B-8 | FT450-A-A10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-B-6 | FT450-A-A11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-A-1 | FT450-A-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-A-3 | FT450-A-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-A-5 | FT450-A-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-A-2 | FT450-A-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-A-4 | FT450-A-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-A-6 | FT450-A-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-D-17 | FT450-A-A20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-D-11 | FT450-A-A21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-D-13 | FT450-A-A24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-A-8 | FT450-A-A6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-A-15 | FT450-A-A3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-A-18 | FT450-A-A4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-A-7 | FT450-A-A5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-D-14 | FT450-A-A22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-D-16 | FT450-A-A23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-D-15 | FT450-A-A26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-D-12 | FT450-A-A25 | 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 | Reading |
|---|---|---|---|---|---|
| 1 | FT450-A-A13 | FT450-A-A12 | open (OL) | +12 V supply must not touch sensor ground | |
| 2 | FT450-A-A12 | FT450-A-A14 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 3 | FT450-A-A13 | FT450-A-A14 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 4 | FT450-A-A7 | FT450-A-A13 | open (OL) | power ground must not touch +12 V supply | |
| 5 | FT450-A-A7 | FT450-A-A14 | open (OL) | power ground 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
FT450-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A1 | Injector 1 (Bank A) | — | W28 | — | 0.5 | OEM-A-1 | — | — | — |
| A1 | Injector 1 (Bank A) | — | W30 | — | 0.5 | OEM-A-5 | — | — | — |
| A1 | Injector 1 (Bank A) | — | W32 | — | 0.5 | OEM-A-4 | — | — | — |
| A10 | Ignition 3 | — | W26 | — | 0.5 | OEM-B-8 | — | — | — |
| A11 | Ignition 4 | — | W27 | — | 0.5 | OEM-B-6 | — | — | — |
| A12 | Signal ground | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| A13 | +12V switched | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| A14 | +5V sensor supply | — | W19 | — | 0.5 | SP-5V1-1 | — | — | — |
| A15 | CAN A LOW | — | — | — | — | — | — | — | — |
| A16 | CAN A HIGH | — | — | — | — | — | — | — | — |
| A17 | Phase input (cam) | — | W23 | — | 0.5 | OEM-B-11 | — | — | — |
| A18 | RPM reference (crank -) | — | W20 | — | 0.5 | OEM-B-15 | — | — | — |
| A18 | RPM reference (crank -) | — | W21 | — | 0.5 | SP-0V-1 | — | — | — |
| A19 | RPM signal (crank +) | — | W22 | — | 0.5 | OEM-B-13 | — | — | — |
| A2 | Injector 2 (Bank A) | — | W29 | — | 0.5 | OEM-A-3 | — | — | — |
| A2 | Injector 2 (Bank A) | — | W31 | — | 0.5 | OEM-A-2 | — | — | — |
| A2 | Injector 2 (Bank A) | — | W33 | — | 0.5 | OEM-A-6 | — | — | — |
| A20 | White input 1 | — | W34 | — | 0.5 | OEM-D-17 | — | — | — |
| A21 | White input 2 | — | W35 | — | 0.5 | OEM-D-11 | — | — | — |
| A22 | White input 3 (TPS) | — | W41 | — | 0.5 | OEM-D-14 | — | — | — |
| A23 | White input 4 (oil pressure) | — | W42 | — | 0.5 | OEM-D-16 | — | — | — |
| A24 | White input 5 (water temp) | — | W36 | — | 0.5 | OEM-D-13 | — | — | — |
| A25 | White input 6 (fuel pressure) | — | W44 | — | 0.5 | OEM-D-12 | — | — | — |
| A26 | White input 7 (air temp) | — | W43 | — | 0.5 | OEM-D-15 | — | — | — |
| A3 | Aux 1 | — | W38 | — | 0.5 | OEM-A-15 | — | — | — |
| A4 | Aux 2 | — | W39 | — | 0.5 | OEM-A-18 | — | — | — |
| A5 | Aux 3 | — | W40 | — | 0.5 | OEM-A-7 | — | — | — |
| A6 | Aux 4 (fuel pump / relays) | — | W37 | — | 0.5 | OEM-A-8 | — | — | — |
| A7 | Power ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| A8 | Ignition 1 | — | W24 | — | 0.5 | OEM-A-21 | — | — | — |
| A9 | Ignition 2 | — | W25 | — | 0.5 | OEM-A-22 | — | — | — |
OEM-5
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| F2 | Front VTEC pressure switch | — | — | — | — | — | — | — | — |
| F4 | Rear VTEC pressure switch | — | — | — | — | — | — | — | — |
| F5 | Front VTEC solenoid valve | — | — | — | — | — | — | — | — |
| F7 | Rear VTEC solenoid valve | — | — | — | — | — | — | — | — |
OEM-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injector 1 | — | W28 | — | 0.5 | FT450-A-A1 | — | — | — |
| 10 | Front O2 sensor heater (HTCNTF) | — | — | — | — | — | — | — | — |
| 11 | EGR control solenoid | — | — | — | — | — | — | — | — |
| 12 | Rear O2 sensor heater (HTCNTR) | — | — | — | — | — | — | — | — |
| 13 | Check engine light (WARN) | — | — | — | — | — | — | — | — |
| 14 | Chamber volume control solenoid (BPS) | — | — | — | — | — | — | — | — |
| 15 | A/C clutch relay (ACC) | — | W38 | — | 0.5 | FT450-A-A3 | — | — | — |
| 18 | Radiator fan control (FANCNTR) | — | W39 | — | 0.5 | FT450-A-A4 | — | — | — |
| 2 | Injector 4 | — | W31 | — | 0.5 | FT450-A-A2 | — | — | — |
| 20 | EVAP purge cut-off solenoid (PGS) | — | — | — | — | — | — | — | — |
| 21 | Ignition coil 1 | — | W24 | — | 0.5 | FT450-A-A8 | — | — | — |
| 22 | Ignition coil 2 | — | W25 | — | 0.5 | FT450-A-A9 | — | — | — |
| 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) | — | W8 | — | 0.5 | SP-0V-1 | — | — | — |
| 3 | Injector 2 | — | W29 | — | 0.5 | FT450-A-A2 | — | — | — |
| 4 | Injector 5 | — | W32 | — | 0.5 | FT450-A-A1 | — | — | — |
| 5 | Injector 3 | — | W30 | — | 0.5 | FT450-A-A1 | — | — | — |
| 6 | Injector 6 | — | W33 | — | 0.5 | FT450-A-A2 | — | — | — |
| 7 | Main relay | — | W40 | — | 0.5 | FT450-A-A5 | — | — | — |
| 8 | Fuel pump relay 2 (FLR2) | — | W37 | — | 0.5 | FT450-A-A6 | — | — | — |
| 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 | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| 11 | CYL 1P — CYP sensor 1 signal | — | W23 | — | 0.5 | FT450-A-A17 | — | — | — |
| 12 | CYL 1M — CYP sensor 1 return | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| 13 | CRNK 2P — TDC sensor signal | — | W22 | — | 0.5 | FT450-A-A19 | — | — | — |
| 14 | CRNK 2M — TDC sensor return | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| 15 | CRNK 1P — crank sensor signal | — | W20 | — | 0.5 | FT450-A-A18 | — | — | — |
| 16 | CRNK 1M — crank sensor return | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 2 | Chassis ground (LG2) | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 3 | Ignition coil 6 | — | — | — | — | — | — | — | — |
| 4 | Ignition coil 5 | — | — | — | — | — | — | — | — |
| 6 | Ignition coil 4 | — | W27 | — | 0.5 | FT450-A-A11 | — | — | — |
| 7 | Neutral switch (M/T) / gear position (A/T) | — | — | — | — | — | — | — | — |
| 8 | Ignition coil 3 | — | W26 | — | 0.5 | FT450-A-A10 | — | — | — |
| 9 | CYL 2P — CYP sensor 2 signal | — | — | — | — | — | — | — | — |
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) | — | — | — | — | — | — | — | — |
| 12 | Traction control | — | — | — | — | — | — | — | — |
| 2 | Vehicle speed sensor (VSS) | — | — | — | — | — | — | — | — |
| 3 | A/C switch (ACS) | — | — | — | — | — | — | — | — |
| 4 | Tachometer output (NEP) | — | — | — | — | — | — | — | — |
| 5 | A/C pressure switch (PDSW) | — | — | — | — | — | — | — | — |
| 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) | — | W35 | — | 0.5 | FT450-A-A21 | — | — | — |
| 12 | EGR lift sensor (EGRL) | — | W44 | — | 0.5 | FT450-A-A25 | — | — | — |
| 13 | Engine coolant temperature (ECT) | — | W36 | — | 0.5 | FT450-A-A24 | — | — | — |
| 14 | Primary O2 sensor | — | W41 | — | 0.5 | FT450-A-A22 | — | — | — |
| 15 | Intake air temperature (IAT) | — | W43 | — | 0.5 | FT450-A-A26 | — | — | — |
| 16 | Secondary O2 sensor | — | W42 | — | 0.5 | FT450-A-A23 | — | — | — |
| 17 | MAP sensor | — | W34 | — | 0.5 | FT450-A-A20 | — | — | — |
| 18 | +5V sensor supply (VCC) | — | W16 | — | 0.5 | SP-5V1-1 | — | — | — |
| 19 | +5V sensor supply (VCC) | — | W17 | — | 0.5 | SP-5V1-1 | — | — | — |
| 20 | +5V sensor supply (VCC) | — | W18 | — | 0.5 | SP-5V1-1 | — | — | — |
| 21 | Sensor ground (SG) | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 22 | Sensor ground (SG) | — | W14 | — | 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 | — | — | — | — | — | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W8 | — | 0.5 | OEM-A-26 | — | — | — |
| 1 | — | — | W9 | — | 0.5 | OEM-B-10 | — | — | — |
| 1 | — | — | W10 | — | 0.5 | OEM-B-12 | — | — | — |
| 1 | — | — | W11 | — | 0.5 | OEM-B-14 | — | — | — |
| 1 | — | — | W12 | — | 0.5 | OEM-B-16 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | OEM-D-21 | — | — | — |
| 1 | — | — | W14 | — | 0.5 | OEM-D-22 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | FT450-A-A12 | — | — | — |
| 1 | — | — | W21 | — | 0.5 | FT450-A-A18 | — | — | — |
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 | FT450-A-A13 | — | — | — |
SP-5V1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W16 | — | 0.5 | OEM-D-18 | — | — | — |
| 1 | — | — | W17 | — | 0.5 | OEM-D-19 | — | — | — |
| 1 | — | — | W18 | — | 0.5 | OEM-D-20 | — | — | — |
| 1 | — | — | W19 | — | 0.5 | FT450-A-A14 | — | — | — |
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 | FT450-A-A7 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-5-F2 | Front VTEC pressure switch | digital_in | — | — | — | single_source | |
| OEM-5-F4 | Rear VTEC pressure switch | digital_in | — | — | — | single_source | |
| OEM-5-F5 | Front VTEC solenoid valve | high_side_out | — | — | — | single_source | |
| OEM-5-F7 | Rear VTEC solenoid valve | high_side_out | — | — | — | single_source | |
| OEM-A-1 | Injector 1 | injector_out | FT450-A-A1 | Injector 1 (Bank A) | injector_out | single_source | |
| OEM-A-10 | Front O2 sensor heater (HTCNTF) | low_side_out | — | — | — | single_source | |
| OEM-A-11 | EGR control solenoid | low_side_out | — | — | — | single_source | |
| OEM-A-12 | Rear O2 sensor heater (HTCNTR) | low_side_out | — | — | — | single_source | |
| OEM-A-13 | Check engine light (WARN) | low_side_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 | FT450-A-A3 | Aux 1 | low_side_out | single_source | |
| OEM-A-18 | Radiator fan control (FANCNTR) | low_side_out | FT450-A-A4 | Aux 2 | low_side_out | single_source | |
| OEM-A-2 | Injector 4 | injector_out | FT450-A-A2 | Injector 2 (Bank A) | 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 | FT450-A-A8 | Ignition 1 | ignition_out | single_source | |
| OEM-A-22 | Ignition coil 2 | ignition_out | FT450-A-A9 | Ignition 2 | ignition_out | single_source | |
| OEM-A-23 | Power ground (PG1) | ground | FT450-A-A7 | Power ground | ground | single_source | |
| OEM-A-24 | Power ground (PG2) | ground | FT450-A-A7 | Power ground | ground | single_source | |
| OEM-A-25 | ECU power (IGP1) | power_in | FT450-A-A13 | +12V switched | power_in | single_source | |
| OEM-A-26 | Sensor ground (LG1) | sensor_ground | FT450-A-A12 + FT450-A-A18 | Signal ground + RPM reference (crank -) | sensor_ground + trigger_in | single_source | |
| OEM-A-3 | Injector 2 | injector_out | FT450-A-A2 | Injector 2 (Bank A) | injector_out | single_source | |
| OEM-A-4 | Injector 5 | injector_out | FT450-A-A1 | Injector 1 (Bank A) | injector_out | corroborated | |
| OEM-A-5 | Injector 3 | injector_out | FT450-A-A1 | Injector 1 (Bank A) | injector_out | single_source | |
| OEM-A-6 | Injector 6 | injector_out | FT450-A-A2 | Injector 2 (Bank A) | injector_out | single_source | |
| OEM-A-7 | Main relay | low_side_out | FT450-A-A5 | Aux 3 | low_side_out | single_source | |
| OEM-A-8 | Fuel pump relay 2 (FLR2) | low_side_out | FT450-A-A6 | Aux 4 (fuel pump / relays) | 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 | FT450-A-A12 + FT450-A-A18 | Signal ground + RPM reference (crank -) | sensor_ground + trigger_in | single_source | |
| OEM-B-11 | CYL 1P — CYP sensor 1 signal | trigger_in | FT450-A-A17 | Phase input (cam) | trigger_in | single_source | |
| OEM-B-12 | CYL 1M — CYP sensor 1 return | sensor_ground | FT450-A-A12 + FT450-A-A18 | Signal ground + RPM reference (crank -) | sensor_ground + trigger_in | single_source | |
| OEM-B-13 | CRNK 2P — TDC sensor signal | trigger_in | FT450-A-A19 | RPM signal (crank +) | trigger_in | single_source | |
| OEM-B-14 | CRNK 2M — TDC sensor return | sensor_ground | FT450-A-A12 + FT450-A-A18 | Signal ground + RPM reference (crank -) | sensor_ground + trigger_in | single_source | |
| OEM-B-15 | CRNK 1P — crank sensor signal | trigger_in | FT450-A-A12 + FT450-A-A18 | Signal ground + RPM reference (crank -) | sensor_ground + trigger_in | single_source | |
| OEM-B-16 | CRNK 1M — crank sensor return | sensor_ground | FT450-A-A12 + FT450-A-A18 | Signal ground + RPM reference (crank -) | sensor_ground + trigger_in | single_source | |
| OEM-B-2 | Chassis ground (LG2) | ground | FT450-A-A7 | Power ground | ground | single_source | |
| OEM-B-3 | Ignition coil 6 | ignition_out | — | — | — | single_source | |
| OEM-B-4 | Ignition coil 5 | ignition_out | — | — | — | single_source | |
| OEM-B-6 | Ignition coil 4 | ignition_out | FT450-A-A11 | Ignition 4 | ignition_out | single_source | |
| OEM-B-7 | Neutral switch (M/T) / gear position (A/T) | digital_in | — | — | — | single_source | |
| OEM-B-8 | Ignition coil 3 | ignition_out | FT450-A-A10 | Ignition 3 | ignition_out | single_source | |
| OEM-B-9 | CYL 2P — CYP sensor 2 signal | trigger_in | — | — | — | single_source | |
| OEM-C-1 | ECU power (IGP2) | power_in | FT450-A-A13 | +12V switched | power_in | single_source | |
| OEM-C-10 | Traction control | — | — | — | — | single_source | |
| OEM-C-11 | Starter switch (STS) | digital_in | — | — | — | single_source | |
| OEM-C-12 | Traction control | — | — | — | — | single_source | |
| OEM-C-2 | Vehicle speed sensor (VSS) | digital_in | — | — | — | single_source | |
| OEM-C-3 | A/C switch (ACS) | digital_in | — | — | — | single_source | |
| OEM-C-4 | Tachometer output (NEP) | tacho_out | — | — | — | single_source | |
| OEM-C-5 | A/C pressure switch (PDSW) | digital_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 | FT450-A-A21 | White input 2 | analog_in | single_source | |
| OEM-D-12 | EGR lift sensor (EGRL) | analog_in | FT450-A-A25 | White input 6 (fuel pressure) | analog_in | single_source | |
| OEM-D-13 | Engine coolant temperature (ECT) | temp_in | FT450-A-A24 | White input 5 (water temp) | temp_in | single_source | |
| OEM-D-14 | Primary O2 sensor | lambda_nb_in | FT450-A-A22 | White input 3 (TPS) | analog_in | single_source | |
| OEM-D-15 | Intake air temperature (IAT) | temp_in | FT450-A-A26 | White input 7 (air temp) | temp_in | single_source | |
| OEM-D-16 | Secondary O2 sensor | lambda_nb_in | FT450-A-A23 | White input 4 (oil pressure) | analog_in | single_source | |
| OEM-D-17 | MAP sensor | analog_in | FT450-A-A20 | White input 1 | analog_in | single_source | |
| OEM-D-18 | +5V sensor supply (VCC) | vref | FT450-A-A14 | +5V sensor supply | vref | single_source | |
| OEM-D-19 | +5V sensor supply (VCC) | vref | FT450-A-A14 | +5V sensor supply | vref | single_source | |
| OEM-D-20 | +5V sensor supply (VCC) | vref | FT450-A-A14 | +5V sensor supply | vref | single_source | |
| OEM-D-21 | Sensor ground (SG) | sensor_ground | FT450-A-A12 + FT450-A-A18 | Signal ground + RPM reference (crank -) | sensor_ground + trigger_in | single_source | |
| OEM-D-22 | Sensor ground (SG) | sensor_ground | FT450-A-A12 + FT450-A-A18 | Signal ground + RPM reference (crank -) | sensor_ground + trigger_in | 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 | — | — | — | single_source |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | 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 | FT450-A-A13 | 0.85 | no route | +12V switched | — | |
| 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 | FT450-A-A7 | 0.85 | no route | Power ground | — | |
| W8 | OEM-A-26 | SP-0V-1 | 0.5 | no route | Sensor ground (LG1) | — | |
| W9 | OEM-B-10 | SP-0V-1 | 0.5 | no route | CYL 2M — CYP sensor 2 return | — | |
| W10 | OEM-B-12 | SP-0V-1 | 0.5 | no route | CYL 1M — CYP sensor 1 return | — | |
| W11 | OEM-B-14 | SP-0V-1 | 0.5 | no route | CRNK 2M — TDC sensor return | — | |
| W12 | OEM-B-16 | SP-0V-1 | 0.5 | no route | CRNK 1M — crank sensor return | — | |
| W13 | OEM-D-21 | SP-0V-1 | 0.5 | no route | Sensor ground (SG) | — | |
| W14 | OEM-D-22 | SP-0V-1 | 0.5 | no route | Sensor ground (SG) | — | |
| W15 | SP-0V-1 | FT450-A-A12 | 0.5 | no route | Signal ground | — | |
| W16 | OEM-D-18 | SP-5V1-1 | 0.5 | no route | +5V sensor supply (VCC) | — | |
| W17 | OEM-D-19 | SP-5V1-1 | 0.5 | no route | +5V sensor supply (VCC) | — | |
| W18 | OEM-D-20 | SP-5V1-1 | 0.5 | no route | +5V sensor supply (VCC) | — | |
| W19 | SP-5V1-1 | FT450-A-A14 | 0.5 | no route | +5V sensor supply | — | |
| W20 | OEM-B-15 | FT450-A-A18 | 0.5 | no route | CRNK 1P — crank sensor signal | — | |
| W21 | SP-0V-1 | FT450-A-A18 | 0.5 | no route | RPM reference (crank -) | — | |
| W22 | OEM-B-13 | FT450-A-A19 | 0.5 | no route | CRNK 2P — TDC sensor signal | — | |
| W23 | OEM-B-11 | FT450-A-A17 | 0.5 | no route | CYL 1P — CYP sensor 1 signal | — | |
| W24 | OEM-A-21 | FT450-A-A8 | 0.5 | no route | Ignition coil 1 | — | |
| W25 | OEM-A-22 | FT450-A-A9 | 0.5 | no route | Ignition coil 2 | — | |
| W26 | OEM-B-8 | FT450-A-A10 | 0.5 | no route | Ignition coil 3 | — | |
| W27 | OEM-B-6 | FT450-A-A11 | 0.5 | no route | Ignition coil 4 | — | |
| W28 | OEM-A-1 | FT450-A-A1 | 0.5 | no route | Injector 1 | — | |
| W29 | OEM-A-3 | FT450-A-A2 | 0.5 | no route | Injector 2 | — | |
| W30 | OEM-A-5 | FT450-A-A1 | 0.5 | no route | Injector 3 | — | |
| W31 | OEM-A-2 | FT450-A-A2 | 0.5 | no route | Injector 4 | — | |
| W32 | OEM-A-4 | FT450-A-A1 | 0.5 | no route | Injector 5 | — | |
| W33 | OEM-A-6 | FT450-A-A2 | 0.5 | no route | Injector 6 | — | |
| W34 | OEM-D-17 | FT450-A-A20 | 0.5 | no route | MAP sensor | — | |
| W35 | OEM-D-11 | FT450-A-A21 | 0.5 | no route | Throttle position sensor (TPS) | — | |
| W36 | OEM-D-13 | FT450-A-A24 | 0.5 | no route | Engine coolant temperature (ECT) | — | |
| W37 | OEM-A-8 | FT450-A-A6 | 0.5 | no route | Fuel pump relay 2 (FLR2) | — | |
| W38 | OEM-A-15 | FT450-A-A3 | 0.5 | no route | A/C clutch relay (ACC) | — | |
| W39 | OEM-A-18 | FT450-A-A4 | 0.5 | no route | Radiator fan control (FANCNTR) | — | |
| W40 | OEM-A-7 | FT450-A-A5 | 0.5 | no route | Main relay | — | |
| W41 | OEM-D-14 | FT450-A-A22 | 0.5 | no route | Primary O2 sensor | — | |
| W42 | OEM-D-16 | FT450-A-A23 | 0.5 | no route | Secondary O2 sensor | — | |
| W43 | OEM-D-15 | FT450-A-A26 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W44 | OEM-D-12 | FT450-A-A25 | 0.5 | no route | EGR lift sensor (EGRL) | — |
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 | FT450 | The C30A injectors (NSX fuel injector) are low-impedance, but FT450 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. |
| error | NET_MERGED | FT450-A-A1 + OEM-A-1 + OEM-A-4 + OEM-A-5 | 3 different OEM functions share one net: OEM-A-1 Injector 1; OEM-A-4 Injector 5; OEM-A-5 Injector 3 |
| error | NET_MERGED | FT450-A-A2 + OEM-A-2 + OEM-A-3 + OEM-A-6 | 3 different OEM functions share one net: OEM-A-2 Injector 4; OEM-A-3 Injector 2; OEM-A-6 Injector 6 |
| error | REQUIRED_UNMAPPED | OEM-B-3 | Required OEM function "Ignition coil 6" (ignition_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-B-4 | Required OEM function "Ignition coil 5" (ignition_out) is not connected to the new ECU. |
| info | NET_FAMILY | OEM-B-12 ↔ FT450-A-A18 | OEM-B-12 "CYL 1M — CYP sensor 1 return" [sensor_ground] is wired to FT450-A-A18 "RPM reference (crank -)" [trigger_in]. Trigger return tied to sensor/trigger ground: correct for single-ended trigger inputs. |
| info | UNMAPPED | OEM | 30 optional OEM pins are not mapped: OEM-5-F2 Front VTEC pressure switch; OEM-5-F4 Rear VTEC pressure switch; OEM-5-F5 Front VTEC solenoid valve; OEM-5-F7 Rear VTEC solenoid valve; OEM-A-10 Front O2 sensor heater (HTCNTF); OEM-A-11 EGR control solenoid; OEM-A-12 Rear O2 sensor heater (HTCNTR); OEM-A-13 Check engine light (WARN); 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-B-7 Neutral switch (M/T) / gear position (A/T); OEM-B-9 CYL 2P — CYP sensor 2 signal; OEM-C-10 Traction control; OEM-C-11 Starter switch (STS); OEM-C-12 Traction control; OEM-C-2 Vehicle speed sensor (VSS); OEM-C-3 A/C switch (ACS); OEM-C-4 Tachometer output (NEP); OEM-C-5 A/C pressure switch (PDSW); 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); OEM-D-9 Alternator FR signal |
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
Fit check: unconfirmed. Confirm these before building: - Trigger pattern for Honda C30A not found in the ECU's docs (No NSX C30A/C32B CAS pattern in the trigger list.) - No knock input; the stock knock sensor would be unused - Only 4 ignition outputs for 6 cylinders: wasted spark (pair coils per firing order) Auto-mapped by auto_map() from the library pin data on 2026-10-11. Review every wire against both manuals before building. Open items: - OEM-B 4: Ignition coil 5: no free ignition output on FuelTech FT450 - OEM-B 3: Ignition coil 6: no free ignition output on FuelTech FT450 Not wired: - OEM-D 1: Battery backup (VBU): FuelTech FT450 has no battery-constant input; not needed - OEM-B 9: CYL 2P — CYP sensor 2 signal: no free cam_vr/cam_hall/frequency_in input on FuelTech FT450 - OEM-D 4: Knock sensor — front: no free knock input on FuelTech FT450 - OEM-D 3: Knock sensor — rear: no free knock input on FuelTech FT450 - OEM-5 F5: Front VTEC solenoid valve: no free high_side/ls_hs on FuelTech FT450 - OEM-5 F7: Rear VTEC solenoid valve: no free high_side/ls_hs on FuelTech FT450 - OEM-A 10: Front O2 sensor heater (HTCNTF): no free heater_low_side/low_side/relay_control/ls_hs/injector on FuelTech FT450 - OEM-A 12: Rear O2 sensor heater (HTCNTR): no free heater_low_side/low_side/relay_control/ls_hs/injector on FuelTech FT450 - OEM-A 11: EGR control solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-A 13: Check engine light (WARN): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-A 14: Chamber volume control solenoid (BPS): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-A 20: EVAP purge cut-off solenoid (PGS): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-A 9: Idle air control valve (IACV): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-C 4: Tachometer output (NEP): no free tacho/frequency_out/low_side/ls_hs on FuelTech FT450 - OEM-C 2: Vehicle speed sensor (VSS): no free frequency_in/switch_in on FuelTech FT450 - OEM-D 9: Alternator FR signal: no free frequency_in/switch_in on FuelTech FT450 - OEM-5 F2: Front VTEC pressure switch: no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-5 F4: Rear VTEC pressure switch: no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-B 7: Neutral switch (M/T) / gear position (A/T): no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-C 11: Starter switch (STS): no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-C 3: A/C switch (ACS): no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-C 5: A/C pressure switch (PDSW): no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-C 7: Clutch switch (M/T): no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-C 9: Service check connector (SCS): no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-D 8: Ignition timing adjuster (IGADJ): no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - 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 | FuelTech FT450/FT550 ready harness manual (4 & 6 cylinder) — FT450 Connector A pinout | http://ftmanager.fueltech.com.br/downloads/manual/Portugues/Chicote_pronto_FT450-FT550.pdf | — | — | — |
| 3 | vendor_doc | dodo-upgrades: Honda OBD1 V6 ECU pinout | https://dodo-upgrades.nl/index.php/obd1-v6-pinouts/ | archive | 2026-10-05 | f9539af28904 |