Honda NSX NA1 1991-2005 (C30A) → AMP EFI MS3Pro Mini (auto)
Honda NSX NA1 1991-2005 (C30A) — AMP EFI — MS3Pro Mini
⚠ 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 | 3: read the Findings page before cutting any wire |
| Size of the job | 48 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 | MS3PROMINI-A-1 | 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 | MS3PROMINI-A-22 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | MS3PROMINI-A-23 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-A-26 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-B-10 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-B-12 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-B-14 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-B-16 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-D-21 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-D-22 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | SP-0V-1 | MS3PROMINI-A-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-D-18 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-D-19 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-D-20 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | SP-5V1-1 | MS3PROMINI-A-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-B-15 | MS3PROMINI-A-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-B-13 | MS3PROMINI-A-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-B-11 | MS3PROMINI-A-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-B-9 | MS3PROMINI-A-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-A-21 | MS3PROMINI-A-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-A-22 | MS3PROMINI-A-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-B-8 | MS3PROMINI-A-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-B-6 | MS3PROMINI-A-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-A-1 | MS3PROMINI-A-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-A-3 | MS3PROMINI-A-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-A-5 | MS3PROMINI-A-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-A-2 | MS3PROMINI-A-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-A-4 | MS3PROMINI-A-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-A-6 | MS3PROMINI-A-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-D-17 | MS3PROMINI-A-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-D-11 | MS3PROMINI-A-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-D-13 | MS3PROMINI-A-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-A-8 | MS3PROMINI-A-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-A-15 | MS3PROMINI-A-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-A-18 | MS3PROMINI-A-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-A-7 | MS3PROMINI-A-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-D-14 | MS3PROMINI-A-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-D-16 | MS3PROMINI-A-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-D-15 | MS3PROMINI-A-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-D-12 | MS3PROMINI-A-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-C-2 | MS3PROMINI-A-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-D-9 | MS3PROMINI-A-35 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | OEM-5-F2 | MS3PROMINI-A-29 | 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 | MS3PROMINI-A-1 | MS3PROMINI-A-21 | open (OL) | +12 V supply must not touch sensor ground | |
| 2 | MS3PROMINI-A-1 | MS3PROMINI-A-2 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 3 | MS3PROMINI-A-21 | MS3PROMINI-A-2 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 4 | MS3PROMINI-A-22 | MS3PROMINI-A-1 | open (OL) | power ground must not touch +12 V supply | |
| 5 | MS3PROMINI-A-22 | MS3PROMINI-A-2 | 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
MS3PROMINI-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 12V+ switched power in | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 10 | Injector out F | — | W29 | — | 0.5 | OEM-A-1 | — | — | — |
| 11 | Injector out G | — | W30 | — | 0.5 | OEM-A-3 | — | — | — |
| 12 | Injector out H | — | W31 | — | 0.5 | OEM-A-5 | — | — | — |
| 13 | Analog in 1 | — | W35 | — | 0.5 | OEM-D-17 | — | — | — |
| 14 | Analog in 2 | — | W42 | — | 0.5 | OEM-D-14 | — | — | — |
| 15 | Analog in 3 | — | W43 | — | 0.5 | OEM-D-16 | — | — | — |
| 16 | Analog in 4 | — | W45 | — | 0.5 | OEM-D-12 | — | — | — |
| 17 | Spark out A | — | W25 | — | 0.5 | OEM-A-21 | — | — | — |
| 18 | Spark out B | — | W26 | — | 0.5 | OEM-A-22 | — | — | — |
| 19 | Spark out C | — | W27 | — | 0.5 | OEM-B-8 | — | — | — |
| 2 | +5V VREF out | — | W20 | — | 0.5 | SP-5V1-1 | — | — | — |
| 20 | Spark out D | — | W28 | — | 0.5 | OEM-B-6 | — | — | — |
| 21 | Sensor ground | — | W16 | — | 0.5 | SP-0V-1 | — | — | — |
| 22 | Power ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 23 | Power ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 24 | CAN Low | — | — | — | — | — | — | — | — |
| 25 | CAN High | — | — | — | — | — | — | — | — |
| 26 | CLT in | — | W37 | — | 0.5 | OEM-D-13 | — | — | — |
| 27 | IAT in | — | W44 | — | 0.5 | OEM-D-15 | — | — | — |
| 28 | TPS in | — | W36 | — | 0.5 | OEM-D-11 | — | — | — |
| 29 | Digital switched in 1 / Flex fuel | — | W48 | — | 0.5 | OEM-5-F2 | — | — | — |
| 3 | PWM out 1 / Idle | — | W39 | — | 0.5 | OEM-A-15 | — | — | — |
| 30 | CKP+ | — | W21 | — | 0.5 | OEM-B-15 | — | — | — |
| 31 | CKP- | — | W22 | — | 0.5 | OEM-B-13 | — | — | — |
| 32 | CMP+ | — | W23 | — | 0.5 | OEM-B-11 | — | — | — |
| 33 | CMP- | — | W24 | — | 0.5 | OEM-B-9 | — | — | — |
| 34 | Digital frequency in 1 (Hall) | — | W46 | — | 0.5 | OEM-C-2 | — | — | — |
| 35 | Digital frequency in 2 (Hall) | — | W47 | — | 0.5 | OEM-D-9 | — | — | — |
| 4 | Fuel pump out | — | W38 | — | 0.5 | OEM-A-8 | — | — | — |
| 5 | Injector out A | — | W32 | — | 0.5 | OEM-A-2 | — | — | — |
| 6 | Injector out B | — | W33 | — | 0.5 | OEM-A-4 | — | — | — |
| 7 | Injector out C | — | W34 | — | 0.5 | OEM-A-6 | — | — | — |
| 8 | Injector out D | — | W40 | — | 0.5 | OEM-A-18 | — | — | — |
| 9 | Injector out E | — | W41 | — | 0.5 | OEM-A-7 | — | — | — |
OEM-5
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| F2 | Front VTEC pressure switch | — | W48 | — | 0.5 | MS3PROMINI-A-29 | — | — | — |
| 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 | — | W29 | — | 0.5 | MS3PROMINI-A-10 | — | — | — |
| 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) | — | W39 | — | 0.5 | MS3PROMINI-A-3 | — | — | — |
| 18 | Radiator fan control (FANCNTR) | — | W40 | — | 0.5 | MS3PROMINI-A-8 | — | — | — |
| 2 | Injector 4 | — | W32 | — | 0.5 | MS3PROMINI-A-5 | — | — | — |
| 20 | EVAP purge cut-off solenoid (PGS) | — | — | — | — | — | — | — | — |
| 21 | Ignition coil 1 | — | W25 | — | 0.5 | MS3PROMINI-A-17 | — | — | — |
| 22 | Ignition coil 2 | — | W26 | — | 0.5 | MS3PROMINI-A-18 | — | — | — |
| 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) | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| 3 | Injector 2 | — | W30 | — | 0.5 | MS3PROMINI-A-11 | — | — | — |
| 4 | Injector 5 | — | W33 | — | 0.5 | MS3PROMINI-A-6 | — | — | — |
| 5 | Injector 3 | — | W31 | — | 0.5 | MS3PROMINI-A-12 | — | — | — |
| 6 | Injector 6 | — | W34 | — | 0.5 | MS3PROMINI-A-7 | — | — | — |
| 7 | Main relay | — | W41 | — | 0.5 | MS3PROMINI-A-9 | — | — | — |
| 8 | Fuel pump relay 2 (FLR2) | — | W38 | — | 0.5 | MS3PROMINI-A-4 | — | — | — |
| 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 | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| 11 | CYL 1P — CYP sensor 1 signal | — | W23 | — | 0.5 | MS3PROMINI-A-32 | — | — | — |
| 12 | CYL 1M — CYP sensor 1 return | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| 13 | CRNK 2P — TDC sensor signal | — | W22 | — | 0.5 | MS3PROMINI-A-31 | — | — | — |
| 14 | CRNK 2M — TDC sensor return | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 15 | CRNK 1P — crank sensor signal | — | W21 | — | 0.5 | MS3PROMINI-A-30 | — | — | — |
| 16 | CRNK 1M — crank sensor return | — | W13 | — | 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 | — | W28 | — | 0.5 | MS3PROMINI-A-20 | — | — | — |
| 7 | Neutral switch (M/T) / gear position (A/T) | — | — | — | — | — | — | — | — |
| 8 | Ignition coil 3 | — | W27 | — | 0.5 | MS3PROMINI-A-19 | — | — | — |
| 9 | CYL 2P — CYP sensor 2 signal | — | W24 | — | 0.5 | MS3PROMINI-A-33 | — | — | — |
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) | — | W46 | — | 0.5 | MS3PROMINI-A-34 | — | — | — |
| 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) | — | W36 | — | 0.5 | MS3PROMINI-A-28 | — | — | — |
| 12 | EGR lift sensor (EGRL) | — | W45 | — | 0.5 | MS3PROMINI-A-16 | — | — | — |
| 13 | Engine coolant temperature (ECT) | — | W37 | — | 0.5 | MS3PROMINI-A-26 | — | — | — |
| 14 | Primary O2 sensor | — | W42 | — | 0.5 | MS3PROMINI-A-14 | — | — | — |
| 15 | Intake air temperature (IAT) | — | W44 | — | 0.5 | MS3PROMINI-A-27 | — | — | — |
| 16 | Secondary O2 sensor | — | W43 | — | 0.5 | MS3PROMINI-A-15 | — | — | — |
| 17 | MAP sensor | — | W35 | — | 0.5 | MS3PROMINI-A-13 | — | — | — |
| 18 | +5V sensor supply (VCC) | — | W17 | — | 0.5 | SP-5V1-1 | — | — | — |
| 19 | +5V sensor supply (VCC) | — | W18 | — | 0.5 | SP-5V1-1 | — | — | — |
| 20 | +5V sensor supply (VCC) | — | W19 | — | 0.5 | SP-5V1-1 | — | — | — |
| 21 | Sensor ground (SG) | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 22 | Sensor ground (SG) | — | W15 | — | 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 | — | W47 | — | 0.5 | MS3PROMINI-A-35 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W9 | — | 0.5 | OEM-A-26 | — | — | — |
| 1 | — | — | W10 | — | 0.5 | OEM-B-10 | — | — | — |
| 1 | — | — | W11 | — | 0.5 | OEM-B-12 | — | — | — |
| 1 | — | — | W12 | — | 0.5 | OEM-B-14 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | OEM-B-16 | — | — | — |
| 1 | — | — | W14 | — | 0.5 | OEM-D-21 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | OEM-D-22 | — | — | — |
| 1 | — | — | W16 | — | 0.5 | MS3PROMINI-A-21 | — | — | — |
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 | MS3PROMINI-A-1 | — | — | — |
SP-5V1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W17 | — | 0.5 | OEM-D-18 | — | — | — |
| 1 | — | — | W18 | — | 0.5 | OEM-D-19 | — | — | — |
| 1 | — | — | W19 | — | 0.5 | OEM-D-20 | — | — | — |
| 1 | — | — | W20 | — | 0.5 | MS3PROMINI-A-2 | — | — | — |
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 | MS3PROMINI-A-22 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | MS3PROMINI-A-23 | — | — | — |
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 | MS3PROMINI-A-29 | Digital switched in 1 / Flex fuel | 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 | MS3PROMINI-A-10 | Injector out F | 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 | MS3PROMINI-A-3 | PWM out 1 / Idle | low_side_out | single_source | |
| OEM-A-18 | Radiator fan control (FANCNTR) | low_side_out | MS3PROMINI-A-8 | Injector out D | injector_out | single_source | |
| OEM-A-2 | Injector 4 | injector_out | MS3PROMINI-A-5 | Injector out 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 | MS3PROMINI-A-17 | Spark out A | ignition_out | single_source | |
| OEM-A-22 | Ignition coil 2 | ignition_out | MS3PROMINI-A-18 | Spark out B | ignition_out | single_source | |
| OEM-A-23 | Power ground (PG1) | ground | MS3PROMINI-A-22 + MS3PROMINI-A-23 | Power ground + Power ground | ground | single_source | |
| OEM-A-24 | Power ground (PG2) | ground | MS3PROMINI-A-22 + MS3PROMINI-A-23 | Power ground + Power ground | ground | single_source | |
| OEM-A-25 | ECU power (IGP1) | power_in | MS3PROMINI-A-1 | 12V+ switched power in | power_in | single_source | |
| OEM-A-26 | Sensor ground (LG1) | sensor_ground | MS3PROMINI-A-21 | Sensor ground | sensor_ground | single_source | |
| OEM-A-3 | Injector 2 | injector_out | MS3PROMINI-A-11 | Injector out G | injector_out | single_source | |
| OEM-A-4 | Injector 5 | injector_out | MS3PROMINI-A-6 | Injector out B | injector_out | corroborated | |
| OEM-A-5 | Injector 3 | injector_out | MS3PROMINI-A-12 | Injector out H | injector_out | single_source | |
| OEM-A-6 | Injector 6 | injector_out | MS3PROMINI-A-7 | Injector out C | injector_out | single_source | |
| OEM-A-7 | Main relay | low_side_out | MS3PROMINI-A-9 | Injector out E | injector_out | single_source | |
| OEM-A-8 | Fuel pump relay 2 (FLR2) | low_side_out | MS3PROMINI-A-4 | Fuel pump out | 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 | MS3PROMINI-A-21 | Sensor ground | sensor_ground | single_source | |
| OEM-B-11 | CYL 1P — CYP sensor 1 signal | trigger_in | MS3PROMINI-A-32 | CMP+ | trigger_in | single_source | |
| OEM-B-12 | CYL 1M — CYP sensor 1 return | sensor_ground | MS3PROMINI-A-21 | Sensor ground | sensor_ground | single_source | |
| OEM-B-13 | CRNK 2P — TDC sensor signal | trigger_in | MS3PROMINI-A-31 | CKP- | trigger_in | single_source | |
| OEM-B-14 | CRNK 2M — TDC sensor return | sensor_ground | MS3PROMINI-A-21 | Sensor ground | sensor_ground | single_source | |
| OEM-B-15 | CRNK 1P — crank sensor signal | trigger_in | MS3PROMINI-A-30 | CKP+ | trigger_in | single_source | |
| OEM-B-16 | CRNK 1M — crank sensor return | sensor_ground | MS3PROMINI-A-21 | Sensor ground | sensor_ground | single_source | |
| OEM-B-2 | Chassis ground (LG2) | ground | MS3PROMINI-A-22 + MS3PROMINI-A-23 | Power ground + 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 | MS3PROMINI-A-20 | Spark out D | 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 | MS3PROMINI-A-19 | Spark out C | ignition_out | single_source | |
| OEM-B-9 | CYL 2P — CYP sensor 2 signal | trigger_in | MS3PROMINI-A-33 | CMP- | trigger_in | single_source | |
| OEM-C-1 | ECU power (IGP2) | power_in | MS3PROMINI-A-1 | 12V+ switched power in | 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 | MS3PROMINI-A-34 | Digital frequency in 1 (Hall) | 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 | MS3PROMINI-A-28 | TPS in | analog_in | single_source | |
| OEM-D-12 | EGR lift sensor (EGRL) | analog_in | MS3PROMINI-A-16 | Analog in 4 | analog_in | single_source | |
| OEM-D-13 | Engine coolant temperature (ECT) | temp_in | MS3PROMINI-A-26 | CLT in | temp_in | single_source | |
| OEM-D-14 | Primary O2 sensor | lambda_nb_in | MS3PROMINI-A-14 | Analog in 2 | analog_in | single_source | |
| OEM-D-15 | Intake air temperature (IAT) | temp_in | MS3PROMINI-A-27 | IAT in | temp_in | single_source | |
| OEM-D-16 | Secondary O2 sensor | lambda_nb_in | MS3PROMINI-A-15 | Analog in 3 | analog_in | single_source | |
| OEM-D-17 | MAP sensor | analog_in | MS3PROMINI-A-13 | Analog in 1 | analog_in | single_source | |
| OEM-D-18 | +5V sensor supply (VCC) | vref | MS3PROMINI-A-2 | +5V VREF out | vref | single_source | |
| OEM-D-19 | +5V sensor supply (VCC) | vref | MS3PROMINI-A-2 | +5V VREF out | vref | single_source | |
| OEM-D-20 | +5V sensor supply (VCC) | vref | MS3PROMINI-A-2 | +5V VREF out | vref | single_source | |
| OEM-D-21 | Sensor ground (SG) | sensor_ground | MS3PROMINI-A-21 | Sensor ground | sensor_ground | single_source | |
| OEM-D-22 | Sensor ground (SG) | sensor_ground | MS3PROMINI-A-21 | Sensor 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 | MS3PROMINI-A-35 | Digital frequency in 2 (Hall) | 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 | MS3PROMINI-A-1 | 0.85 | no route | 12V+ switched power in | — | |
| 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 | MS3PROMINI-A-22 | 0.85 | no route | Power ground | — | |
| W8 | SP-GND-1 | MS3PROMINI-A-23 | 0.85 | no route | Power ground | — | |
| W9 | OEM-A-26 | SP-0V-1 | 0.5 | no route | Sensor ground (LG1) | — | |
| W10 | OEM-B-10 | SP-0V-1 | 0.5 | no route | CYL 2M — CYP sensor 2 return | — | |
| W11 | OEM-B-12 | SP-0V-1 | 0.5 | no route | CYL 1M — CYP sensor 1 return | — | |
| W12 | OEM-B-14 | SP-0V-1 | 0.5 | no route | CRNK 2M — TDC sensor return | — | |
| W13 | OEM-B-16 | SP-0V-1 | 0.5 | no route | CRNK 1M — crank sensor return | — | |
| W14 | OEM-D-21 | SP-0V-1 | 0.5 | no route | Sensor ground (SG) | — | |
| W15 | OEM-D-22 | SP-0V-1 | 0.5 | no route | Sensor ground (SG) | — | |
| W16 | SP-0V-1 | MS3PROMINI-A-21 | 0.5 | no route | Sensor ground | — | |
| W17 | OEM-D-18 | SP-5V1-1 | 0.5 | no route | +5V sensor supply (VCC) | — | |
| W18 | OEM-D-19 | SP-5V1-1 | 0.5 | no route | +5V sensor supply (VCC) | — | |
| W19 | OEM-D-20 | SP-5V1-1 | 0.5 | no route | +5V sensor supply (VCC) | — | |
| W20 | SP-5V1-1 | MS3PROMINI-A-2 | 0.5 | no route | +5V VREF out | — | |
| W21 | OEM-B-15 | MS3PROMINI-A-30 | 0.5 | no route | CRNK 1P — crank sensor signal | — | |
| W22 | OEM-B-13 | MS3PROMINI-A-31 | 0.5 | no route | CRNK 2P — TDC sensor signal | — | |
| W23 | OEM-B-11 | MS3PROMINI-A-32 | 0.5 | no route | CYL 1P — CYP sensor 1 signal | — | |
| W24 | OEM-B-9 | MS3PROMINI-A-33 | 0.5 | no route | CYL 2P — CYP sensor 2 signal | — | |
| W25 | OEM-A-21 | MS3PROMINI-A-17 | 0.5 | no route | Ignition coil 1 | — | |
| W26 | OEM-A-22 | MS3PROMINI-A-18 | 0.5 | no route | Ignition coil 2 | — | |
| W27 | OEM-B-8 | MS3PROMINI-A-19 | 0.5 | no route | Ignition coil 3 | — | |
| W28 | OEM-B-6 | MS3PROMINI-A-20 | 0.5 | no route | Ignition coil 4 | — | |
| W29 | OEM-A-1 | MS3PROMINI-A-10 | 0.5 | no route | Injector 1 | — | |
| W30 | OEM-A-3 | MS3PROMINI-A-11 | 0.5 | no route | Injector 2 | — | |
| W31 | OEM-A-5 | MS3PROMINI-A-12 | 0.5 | no route | Injector 3 | — | |
| W32 | OEM-A-2 | MS3PROMINI-A-5 | 0.5 | no route | Injector 4 | — | |
| W33 | OEM-A-4 | MS3PROMINI-A-6 | 0.5 | no route | Injector 5 | — | |
| W34 | OEM-A-6 | MS3PROMINI-A-7 | 0.5 | no route | Injector 6 | — | |
| W35 | OEM-D-17 | MS3PROMINI-A-13 | 0.5 | no route | MAP sensor | — | |
| W36 | OEM-D-11 | MS3PROMINI-A-28 | 0.5 | no route | Throttle position sensor (TPS) | — | |
| W37 | OEM-D-13 | MS3PROMINI-A-26 | 0.5 | no route | Engine coolant temperature (ECT) | — | |
| W38 | OEM-A-8 | MS3PROMINI-A-4 | 0.5 | no route | Fuel pump relay 2 (FLR2) | — | |
| W39 | OEM-A-15 | MS3PROMINI-A-3 | 0.5 | no route | A/C clutch relay (ACC) | — | |
| W40 | OEM-A-18 | MS3PROMINI-A-8 | 0.5 | no route | Radiator fan control (FANCNTR) | — | |
| W41 | OEM-A-7 | MS3PROMINI-A-9 | 0.5 | no route | Main relay | — | |
| W42 | OEM-D-14 | MS3PROMINI-A-14 | 0.5 | no route | Primary O2 sensor | — | |
| W43 | OEM-D-16 | MS3PROMINI-A-15 | 0.5 | no route | Secondary O2 sensor | — | |
| W44 | OEM-D-15 | MS3PROMINI-A-27 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W45 | OEM-D-12 | MS3PROMINI-A-16 | 0.5 | no route | EGR lift sensor (EGRL) | — | |
| W46 | OEM-C-2 | MS3PROMINI-A-34 | 0.5 | no route | Vehicle speed sensor (VSS) | — | |
| W47 | OEM-D-9 | MS3PROMINI-A-35 | 0.5 | no route | Alternator FR signal | — | |
| W48 | OEM-5-F2 | MS3PROMINI-A-29 | 0.5 | no route | Front VTEC pressure 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 (6)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | INJECTOR_BALLAST | MS3Pro Mini | The C30A injectors (NSX fuel injector) are low-impedance, but MS3Pro Mini 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 | 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-A-18 ↔ MS3PROMINI-A-8 | OEM-A-18 "Radiator fan control (FANCNTR)" [low_side_out] is wired to MS3PROMINI-A-8 "Injector out D" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-A-7 ↔ MS3PROMINI-A-9 | OEM-A-7 "Main relay" [low_side_out] is wired to MS3PROMINI-A-9 "Injector out E" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | UNMAPPED | OEM | 26 optional OEM pins are not mapped: 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-C-10 Traction control; OEM-C-11 Starter switch (STS); OEM-C-12 Traction control; 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) |
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 (MS3 decoder list has no C30A/C32B/NSX (K24A2, RC51/AP1 S2000, TSX/D17, J-series)) - 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 AMP EFI MS3Pro Mini - OEM-B 3: Ignition coil 6: no free ignition output on AMP EFI MS3Pro Mini Not wired: - OEM-D 1: Battery backup (VBU): AMP EFI MS3Pro Mini has no battery-constant input; not needed - OEM-D 4: Knock sensor — front: no free knock input on AMP EFI MS3Pro Mini - OEM-D 3: Knock sensor — rear: no free knock input on AMP EFI MS3Pro Mini - OEM-5 F5: Front VTEC solenoid valve: no free high_side/ls_hs on AMP EFI MS3Pro Mini - OEM-5 F7: Rear VTEC solenoid valve: no free high_side/ls_hs on AMP EFI MS3Pro Mini - OEM-A 10: Front O2 sensor heater (HTCNTF): no free heater_low_side/low_side/relay_control/ls_hs/injector on AMP EFI MS3Pro Mini - OEM-A 12: Rear O2 sensor heater (HTCNTR): no free heater_low_side/low_side/relay_control/ls_hs/injector on AMP EFI MS3Pro Mini - OEM-A 11: EGR control solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on AMP EFI MS3Pro Mini - OEM-A 13: Check engine light (WARN): no free low_side/relay_control/heater_low_side/ls_hs/injector on AMP EFI MS3Pro Mini - OEM-A 14: Chamber volume control solenoid (BPS): no free low_side/relay_control/heater_low_side/ls_hs/injector on AMP EFI MS3Pro Mini - OEM-A 20: EVAP purge cut-off solenoid (PGS): no free low_side/relay_control/heater_low_side/ls_hs/injector on AMP EFI MS3Pro Mini - OEM-A 9: Idle air control valve (IACV): no free low_side/relay_control/heater_low_side/ls_hs/injector on AMP EFI MS3Pro Mini - OEM-C 4: Tachometer output (NEP): no free tacho/frequency_out/low_side/ls_hs on AMP EFI MS3Pro Mini - OEM-5 F4: Rear VTEC pressure switch: no free switch_in/frequency_in/analog_0_5 on AMP EFI MS3Pro Mini - OEM-B 7: Neutral switch (M/T) / gear position (A/T): no free switch_in/frequency_in/analog_0_5 on AMP EFI MS3Pro Mini - OEM-C 11: Starter switch (STS): no free switch_in/frequency_in/analog_0_5 on AMP EFI MS3Pro Mini - OEM-C 3: A/C switch (ACS): no free switch_in/frequency_in/analog_0_5 on AMP EFI MS3Pro Mini - OEM-C 5: A/C pressure switch (PDSW): no free switch_in/frequency_in/analog_0_5 on AMP EFI MS3Pro Mini - OEM-C 7: Clutch switch (M/T): no free switch_in/frequency_in/analog_0_5 on AMP EFI MS3Pro Mini - OEM-C 9: Service check connector (SCS): no free switch_in/frequency_in/analog_0_5 on AMP EFI MS3Pro Mini - OEM-D 8: Ignition timing adjuster (IGADJ): no free switch_in/frequency_in/analog_0_5 on AMP EFI MS3Pro Mini - 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 | AMP EFI: MS3Pro Mini manual (fw 1.6.1) pinout & output ratings | https://cdn.shopify.com/s/files/1/0960/0014/7754/files/MS3Pro_User_Manual_Firmware_1.6.1_Mini.pdf?v=1760643335 | archive | 2026-10-05 | bed7d8ae8408 |
| 3 | vendor_doc | dodo-upgrades: Honda OBD1 V6 ECU pinout | https://dodo-upgrades.nl/index.php/obd1-v6-pinouts/ | archive | 2026-10-05 | f9539af28904 |