MX-5 Miata NA8 1994-95 (BP-ZE, 1.8, OBD-I) → rusEFI Proteus (auto)
MX-5 Miata NA8 1994-95 (BP-ZE, 1.8, OBD-I) — rusEFI — Proteus
Drawn by Michael Gnankou · Rev 0 · proposal · 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 | proposal · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | none |
| Size of the job | 54 wires · 8 connectors · 2 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-1-B | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | SP-14V-1 | PROTEUS-Black23-23 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | OEM-2-A | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-2-B | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | SP-GND-1 | PROTEUS-Black23-14 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | SP-GND-1 | PROTEUS-Black23-19 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | SP-GND-1 | PROTEUS-Black23-20 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | PROTEUS-Black35-17 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | PROTEUS-Black35-18 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-GND-1 | PROTEUS-Black35-24 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-2-C | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-2-D | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-2-F | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | SP-0V-1 | PROTEUS-White35-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | SP-0V-1 | PROTEUS-White35-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | SP-0V-1 | PROTEUS-White35-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | SP-0V-1 | PROTEUS-White35-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | SP-0V-1 | PROTEUS-White35-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | SP-0V-1 | PROTEUS-White35-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | SP-0V-1 | PROTEUS-White35-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | SP-0V-1 | PROTEUS-White35-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | SP-0V-1 | PROTEUS-White35-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | SP-0V-1 | PROTEUS-White35-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-2-K | PROTEUS-White35-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-2-E | PROTEUS-Black23-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | SP-0V-1 | PROTEUS-Black23-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-2-G | PROTEUS-Black23-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-1-G | PROTEUS-Black35-35 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-1-H | PROTEUS-Black35-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-2-U | PROTEUS-Black35-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-2-V | PROTEUS-Black35-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-2-Y | PROTEUS-Black35-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-2-Z | PROTEUS-Black35-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-1-J | PROTEUS-Black35-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-1-R | PROTEUS-Black35-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-2-S | PROTEUS-Black35-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-2-T | PROTEUS-Black35-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-1-L | PROTEUS-Black35-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-2-L | PROTEUS-Black35-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-2-W | PROTEUS-Black35-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-1-E | PROTEUS-Black35-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-2-R | PROTEUS-Black35-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-2-X | PROTEUS-Black35-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-2-O | PROTEUS-White35-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-2-M | PROTEUS-White35-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-2-N | PROTEUS-White35-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-2-Q | PROTEUS-White35-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | OEM-2-P | PROTEUS-White35-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W49 | OEM-1-M | PROTEUS-Black23-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W50 | OEM-1-C | PROTEUS-Black23-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W51 | OEM-1-O | PROTEUS-Black23-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W52 | OEM-1-P | PROTEUS-Black23-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W53 | OEM-1-Q | PROTEUS-Black23-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W54 | OEM-1-V | PROTEUS-White35-25 | 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 | PROTEUS-Black23-23 | PROTEUS-Black23-13 | open (OL) | +12 V supply must not touch sensor ground | |
| 2 | PROTEUS-Black23-23 | PROTEUS-Black23-14 | open (OL) | +12 V supply must not touch power ground | |
| 3 | PROTEUS-Black23-13 | PROTEUS-White35-10 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 4 | PROTEUS-Black23-14 | PROTEUS-White35-10 | open (OL) | power ground must not touch 5 V sensor reference | |
| 5 | PROTEUS-Black23-23 | PROTEUS-White35-10 | open (OL) | +12 V supply must not touch 5 V sensor reference |
If any reading doesn't match, stop and get help before powering up.
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
OEM-1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Constant +12V | — | — | — | — | — | — | — | — |
| B | ECU power +14V (main relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| C | Start signal | — | W50 | — | 0.5 | PROTEUS-Black23-10 | — | — | — |
| D | Data link connector | — | — | — | — | — | — | — | — |
| E | Malfunction indicator lamp (MIL) | — | W41 | — | 0.5 | PROTEUS-Black35-5 | — | — | — |
| G | Ignition 1 (coils 1+4, wasted spark) | — | W28 | — | 0.5 | PROTEUS-Black35-35 | — | — | — |
| H | Ignition 2 (coils 2+3, wasted spark) | — | W29 | — | 0.5 | PROTEUS-Black35-34 | — | — | — |
| I | Powertrain control module (transmission) | — | — | — | — | — | — | — | — |
| J | A/C relay | — | W34 | — | 0.5 | PROTEUS-Black35-20 | — | — | — |
| L | Coolant fan relay | — | W38 | — | 0.5 | PROTEUS-Black35-11 | — | — | — |
| M | Vehicle speed | — | W49 | — | 0.5 | PROTEUS-Black23-2 | — | — | — |
| N | Powertrain control module (transmission) | — | — | — | — | — | — | — | — |
| O | Stop light switch | — | W51 | — | 0.5 | PROTEUS-Black23-3 | — | — | — |
| P | Power steering pressure switch | — | W52 | — | 0.5 | PROTEUS-Black23-9 | — | — | — |
| Q | A/C request | — | W53 | — | 0.5 | PROTEUS-Black23-11 | — | — | — |
| R | Cooling fan relay | — | W35 | — | 0.5 | PROTEUS-Black35-9 | — | — | — |
| S | Heater control unit | — | — | — | — | — | — | — | — |
| T | Unknown | — | — | — | — | — | — | — | — |
| U | Unknown | — | — | — | — | — | — | — | — |
| V | Neutral/clutch switch | — | W54 | — | 0.5 | PROTEUS-White35-25 | — | — | — |
OEM-2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Power ground | — | W3 | — | 0.85 | SP-GND-1 | — | — | — |
| B | Power ground | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| C | Sensor ground (E2) | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| D | Sensor ground (E2) | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| E | Crank position (CAS NE) | — | W25 | — | 0.5 | PROTEUS-Black23-5 | — | — | — |
| F | MAF ground | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| G | Cam position (CAS G) | — | W27 | — | 0.5 | PROTEUS-Black23-1 | — | — | — |
| H | Data link connector | — | — | — | — | — | — | — | — |
| I | Tachometer output | — | — | — | — | — | — | — | — |
| J | EGR function sensor | — | — | — | — | — | — | — | — |
| K | +5V sensor supply | — | W24 | — | 0.5 | PROTEUS-White35-10 | — | — | — |
| L | Rear defroster relay | — | W39 | — | 0.5 | PROTEUS-Black35-12 | — | — | — |
| M | Throttle position (TPS) | — | W45 | — | 0.5 | PROTEUS-White35-24 | — | — | — |
| N | O2 sensor | — | W46 | — | 0.5 | PROTEUS-White35-14 | — | — | — |
| O | Mass air flow (MAF) | — | W44 | — | 0.5 | PROTEUS-White35-13 | — | — | — |
| P | Intake air temperature (IAT) | — | W48 | — | 0.5 | PROTEUS-White35-30 | — | — | — |
| Q | Coolant temperature (ECT) | — | W47 | — | 0.5 | PROTEUS-White35-20 | — | — | — |
| R | PRC solenoid (fuel pressure regulator) | — | W42 | — | 0.5 | PROTEUS-Black35-6 | — | — | — |
| S | Condenser fan relay | — | W36 | — | 0.5 | PROTEUS-Black35-21 | — | — | — |
| T | Fuel pump relay | — | W37 | — | 0.5 | PROTEUS-Black35-10 | — | — | — |
| U | Injector 1 | — | W30 | — | 0.5 | PROTEUS-Black35-3 | — | — | — |
| V | Injector 2 | — | W31 | — | 0.5 | PROTEUS-Black35-15 | — | — | — |
| W | ISC solenoid | — | W40 | — | 0.5 | PROTEUS-Black35-23 | — | — | — |
| X | Evap purge solenoid | — | W43 | — | 0.5 | PROTEUS-Black35-7 | — | — | — |
| Y | Injector 3 | — | W32 | — | 0.5 | PROTEUS-Black35-4 | — | — | — |
| Z | Injector 4 | — | W33 | — | 0.5 | PROTEUS-Black35-16 | — | — | — |
PROTEUS-Black23
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Digital 2 | — | W27 | — | 0.5 | OEM-2-G | — | — | — |
| 10 | Digital 1 | — | W50 | — | 0.5 | OEM-1-C | — | — | — |
| 11 | Digital 6 | — | W53 | — | 0.5 | OEM-1-Q | — | — | — |
| 12 | VR 2 negative | — | — | — | — | — | — | — | — |
| 13 | VR 1 negative | — | W26 | — | 0.5 | SP-0V-1 | — | — | — |
| 14 | Power ground | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 15 | ETB 2 positive | — | — | — | — | — | — | — | — |
| 16 | CAN 1 Low | — | — | — | — | — | — | — | — |
| 17 | CAN 1 High | — | — | — | — | — | — | — | — |
| 18 | Ignition switch in | — | — | — | — | — | — | — | — |
| 19 | Power ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 2 | Digital 3 | — | W49 | — | 0.5 | OEM-1-M | — | — | — |
| 20 | Power ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 21 | CAN 2 Low | — | — | — | — | — | — | — | — |
| 22 | CAN 2 High | — | — | — | — | — | — | — | — |
| 23 | Main relay feed | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 3 | Digital 4 | — | W51 | — | 0.5 | OEM-1-O | — | — | — |
| 4 | VR 2 positive | — | — | — | — | — | — | — | — |
| 5 | VR 1 positive | — | W25 | — | 0.5 | OEM-2-E | — | — | — |
| 6 | ETB 1 negative | — | — | — | — | — | — | — | — |
| 7 | ETB 1 positive | — | — | — | — | — | — | — | — |
| 8 | ETB 2 negative | — | — | — | — | — | — | — | — |
| 9 | Digital 5 | — | W52 | — | 0.5 | OEM-1-P | — | — | — |
PROTEUS-Black35
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Highside 2 | — | — | — | — | — | — | — | — |
| 10 | Lowside 13 | — | W37 | — | 0.5 | OEM-2-T | — | — | — |
| 11 | Lowside 14 | — | W38 | — | 0.5 | OEM-1-L | — | — | — |
| 12 | Lowside 15 | — | W39 | — | 0.5 | OEM-2-L | — | — | — |
| 13 | Highside 3 | — | — | — | — | — | — | — | — |
| 14 | Highside 4 | — | — | — | — | — | — | — | — |
| 15 | Injector 2 | — | W31 | — | 0.5 | OEM-2-V | — | — | — |
| 16 | Injector 4 | — | W33 | — | 0.5 | OEM-2-Z | — | — | — |
| 17 | Power ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 18 | Power ground | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| 19 | Injector 8 | — | — | — | — | — | — | — | — |
| 2 | Highside 1 | — | — | — | — | — | — | — | — |
| 20 | Lowside 10 | — | W34 | — | 0.5 | OEM-1-J | — | — | — |
| 21 | Lowside 12 | — | W36 | — | 0.5 | OEM-2-S | — | — | — |
| 22 | Ignition 3 | — | — | — | — | — | — | — | — |
| 23 | Lowside 16 | — | W40 | — | 0.5 | OEM-2-W | — | — | — |
| 24 | Power ground | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
| 25 | Ignition 12 | — | — | — | — | — | — | — | — |
| 26 | Ignition 11 | — | — | — | — | — | — | — | — |
| 27 | Ignition 10 | — | — | — | — | — | — | — | — |
| 28 | Ignition 9 | — | — | — | — | — | — | — | — |
| 29 | Ignition 8 | — | — | — | — | — | — | — | — |
| 3 | Injector 1 | — | W30 | — | 0.5 | OEM-2-U | — | — | — |
| 30 | Ignition 7 | — | — | — | — | — | — | — | — |
| 31 | Ignition 6 | — | — | — | — | — | — | — | — |
| 32 | Ignition 5 | — | — | — | — | — | — | — | — |
| 33 | Ignition 4 | — | — | — | — | — | — | — | — |
| 34 | Ignition 2 | — | W29 | — | 0.5 | OEM-1-H | — | — | — |
| 35 | Ignition 1 | — | W28 | — | 0.5 | OEM-1-G | — | — | — |
| 4 | Injector 3 | — | W32 | — | 0.5 | OEM-2-Y | — | — | — |
| 5 | Injector 5 | — | W41 | — | 0.5 | OEM-1-E | — | — | — |
| 6 | Injector 6 | — | W42 | — | 0.5 | OEM-2-R | — | — | — |
| 7 | Injector 7 | — | W43 | — | 0.5 | OEM-2-X | — | — | — |
| 8 | Injector 9 | — | — | — | — | — | — | — | — |
| 9 | Lowside 11 | — | W35 | — | 0.5 | OEM-1-R | — | — | — |
PROTEUS-White35
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Sensor ground | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 10 | 5V supply #2 | — | W24 | — | 0.5 | OEM-2-K | — | — | — |
| 11 | 12V sensor supply | — | — | — | — | — | — | — | — |
| 12 | 12V sensor supply | — | — | — | — | — | — | — | — |
| 13 | Analog Volt 1 | — | W44 | — | 0.5 | OEM-2-O | — | — | — |
| 14 | Analog Volt 3 | — | W46 | — | 0.5 | OEM-2-N | — | — | — |
| 15 | Analog Volt 5 | — | — | — | — | — | — | — | — |
| 16 | Analog Volt 7 | — | — | — | — | — | — | — | — |
| 17 | Analog Volt 9 | — | — | — | — | — | — | — | — |
| 18 | Analog Volt 11 | — | — | — | — | — | — | — | — |
| 19 | Thermistor 1 | — | — | — | — | — | — | — | — |
| 2 | Sensor ground | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 20 | Coolant temp (CLT) | — | W47 | — | 0.5 | OEM-2-Q | — | — | — |
| 21 | 5V supply #1 | — | — | — | — | — | — | — | — |
| 22 | 5V supply #2 | — | — | — | — | — | — | — | — |
| 23 | Sensor ground | — | W16 | — | 0.5 | SP-0V-1 | — | — | — |
| 24 | Analog Volt 2 | — | W45 | — | 0.5 | OEM-2-M | — | — | — |
| 25 | Analog Volt 4 | — | W54 | — | 0.5 | OEM-1-V | — | — | — |
| 26 | Analog Volt 6 | — | — | — | — | — | — | — | — |
| 27 | Analog Volt 8 | — | — | — | — | — | — | — | — |
| 28 | Analog Volt 10 | — | — | — | — | — | — | — | — |
| 29 | Sensor ground | — | W17 | — | 0.5 | SP-0V-1 | — | — | — |
| 3 | Sensor ground | — | W18 | — | 0.5 | SP-0V-1 | — | — | — |
| 30 | Intake air temp (IAT) | — | W48 | — | 0.5 | OEM-2-P | — | — | — |
| 31 | Thermistor 4 | — | — | — | — | — | — | — | — |
| 32 | 5V supply #1 | — | — | — | — | — | — | — | — |
| 33 | 5V supply #2 | — | — | — | — | — | — | — | — |
| 34 | Knock 1 | — | — | — | — | — | — | — | — |
| 35 | Knock 2 | — | — | — | — | — | — | — | — |
| 4 | Sensor ground | — | W19 | — | 0.5 | SP-0V-1 | — | — | — |
| 5 | Sensor ground | — | W20 | — | 0.5 | SP-0V-1 | — | — | — |
| 6 | Sensor ground | — | W21 | — | 0.5 | SP-0V-1 | — | — | — |
| 7 | Sensor ground | — | W22 | — | 0.5 | SP-0V-1 | — | — | — |
| 8 | Sensor ground | — | W23 | — | 0.5 | SP-0V-1 | — | — | — |
| 9 | 5V supply #1 | — | — | — | — | — | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W11 | — | 0.5 | OEM-2-C | — | — | — |
| 1 | — | — | W12 | — | 0.5 | OEM-2-D | — | — | — |
| 1 | — | — | W13 | — | 0.5 | OEM-2-F | — | — | — |
| 1 | — | — | W14 | — | 0.5 | PROTEUS-White35-1 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | PROTEUS-White35-2 | — | — | — |
| 1 | — | — | W16 | — | 0.5 | PROTEUS-White35-23 | — | — | — |
| 1 | — | — | W17 | — | 0.5 | PROTEUS-White35-29 | — | — | — |
| 1 | — | — | W18 | — | 0.5 | PROTEUS-White35-3 | — | — | — |
| 1 | — | — | W19 | — | 0.5 | PROTEUS-White35-4 | — | — | — |
| 1 | — | — | W20 | — | 0.5 | PROTEUS-White35-5 | — | — | — |
| 1 | — | — | W21 | — | 0.5 | PROTEUS-White35-6 | — | — | — |
| 1 | — | — | W22 | — | 0.5 | PROTEUS-White35-7 | — | — | — |
| 1 | — | — | W23 | — | 0.5 | PROTEUS-White35-8 | — | — | — |
| 1 | — | — | W26 | — | 0.5 | PROTEUS-Black23-13 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-1-B | — | — | — |
| 1 | — | — | W2 | — | 0.85 | PROTEUS-Black23-23 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W3 | — | 0.85 | OEM-2-A | — | — | — |
| 1 | — | — | W4 | — | 0.85 | OEM-2-B | — | — | — |
| 1 | — | — | W5 | — | 0.85 | PROTEUS-Black23-14 | — | — | — |
| 1 | — | — | W6 | — | 0.85 | PROTEUS-Black23-19 | — | — | — |
| 1 | — | — | W7 | — | 0.85 | PROTEUS-Black23-20 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | PROTEUS-Black35-17 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | PROTEUS-Black35-18 | — | — | — |
| 1 | — | — | W10 | — | 0.85 | PROTEUS-Black35-24 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-1-A | Constant +12V | power_in | — | — | — | LR | single_source |
| OEM-1-B | ECU power +14V (main relay) | power_in | PROTEUS-Black23-23 | Main relay feed | power_in | WR | single_source |
| OEM-1-C | Start signal | digital_in | PROTEUS-Black23-10 | Digital 1 | digital_in | V | single_source |
| OEM-1-D | Data link connector | serial | — | — | — | WG | single_source |
| OEM-1-E | Malfunction indicator lamp (MIL) | low_side_out | PROTEUS-Black35-5 | Injector 5 | injector_out | YB | single_source |
| OEM-1-G | Ignition 1 (coils 1+4, wasted spark) | ignition_out | PROTEUS-Black35-35 | Ignition 1 | ignition_out | BrY | single_source |
| OEM-1-H | Ignition 2 (coils 2+3, wasted spark) | ignition_out | PROTEUS-Black35-34 | Ignition 2 | ignition_out | Br | single_source |
| OEM-1-I | Powertrain control module (transmission) | — | — | — | — | LW | single_source |
| OEM-1-J | A/C relay | low_side_out | PROTEUS-Black35-20 | Lowside 10 | low_side_out | single_source | |
| OEM-1-L | Coolant fan relay | low_side_out | PROTEUS-Black35-11 | Lowside 14 | low_side_out | BG | single_source |
| OEM-1-M | Vehicle speed | digital_in | PROTEUS-Black23-2 | Digital 3 | digital_in | GR | single_source |
| OEM-1-N | Powertrain control module (transmission) | — | — | — | — | R | single_source |
| OEM-1-O | Stop light switch | digital_in | PROTEUS-Black23-3 | Digital 4 | digital_in | GB | single_source |
| OEM-1-P | Power steering pressure switch | digital_in | PROTEUS-Black23-9 | Digital 5 | digital_in | LY | single_source |
| OEM-1-Q | A/C request | digital_in | PROTEUS-Black23-11 | Digital 6 | digital_in | LgB | single_source |
| OEM-1-R | Cooling fan relay | low_side_out | PROTEUS-Black35-9 | Lowside 11 | low_side_out | YB | single_source |
| OEM-1-S | Heater control unit | — | — | — | — | LOr | single_source |
| OEM-1-T | Unknown | — | — | — | — | YR | single_source |
| OEM-1-U | Unknown | — | — | — | — | RB | single_source |
| OEM-1-V | Neutral/clutch switch | digital_in | PROTEUS-White35-25 | Analog Volt 4 | analog_in | BrW | single_source |
| OEM-2-A | Power ground | ground | PROTEUS-Black23-14 + PROTEUS-Black23-19 + PROTEUS-Black23-20 + PROTEUS-Black35-17 + PROTEUS-Black35-18 + PROTEUS-Black35-24 | Power ground + Power ground + Power ground + Power ground + Power ground + Power ground | ground | B | single_source |
| OEM-2-B | Power ground | ground | PROTEUS-Black23-14 + PROTEUS-Black23-19 + PROTEUS-Black23-20 + PROTEUS-Black35-17 + PROTEUS-Black35-18 + PROTEUS-Black35-24 | Power ground + Power ground + Power ground + Power ground + Power ground + Power ground | ground | B | single_source |
| OEM-2-C | Sensor ground (E2) | sensor_ground | PROTEUS-Black23-13 + PROTEUS-White35-1 + PROTEUS-White35-2 + PROTEUS-White35-23 + PROTEUS-White35-29 + PROTEUS-White35-3 + PROTEUS-White35-4 + PROTEUS-White35-5 + PROTEUS-White35-6 + PROTEUS-White35-7 + PROTEUS-White35-8 | VR 1 negative + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground | sensor_ground + trigger_in | BLg | corroborated |
| OEM-2-D | Sensor ground (E2) | sensor_ground | PROTEUS-Black23-13 + PROTEUS-White35-1 + PROTEUS-White35-2 + PROTEUS-White35-23 + PROTEUS-White35-29 + PROTEUS-White35-3 + PROTEUS-White35-4 + PROTEUS-White35-5 + PROTEUS-White35-6 + PROTEUS-White35-7 + PROTEUS-White35-8 | VR 1 negative + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground | sensor_ground + trigger_in | BL | corroborated |
| OEM-2-E | Crank position (CAS NE) | trigger_in | PROTEUS-Black23-5 | VR 1 positive | trigger_in | W | single_source |
| OEM-2-F | MAF ground | sensor_ground | PROTEUS-Black23-13 + PROTEUS-White35-1 + PROTEUS-White35-2 + PROTEUS-White35-23 + PROTEUS-White35-29 + PROTEUS-White35-3 + PROTEUS-White35-4 + PROTEUS-White35-5 + PROTEUS-White35-6 + PROTEUS-White35-7 + PROTEUS-White35-8 | VR 1 negative + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground | sensor_ground + trigger_in | BR | single_source |
| OEM-2-G | Cam position (CAS G) | trigger_in | PROTEUS-Black23-1 | Digital 2 | trigger_in | YL | single_source |
| OEM-2-H | Data link connector | serial | — | — | — | LgY | single_source |
| OEM-2-I | Tachometer output | tacho_out | — | — | — | BW | single_source |
| OEM-2-J | EGR function sensor | — | — | — | — | LgR | single_source |
| OEM-2-K | +5V sensor supply | vref | PROTEUS-White35-10 | 5V supply #2 | vref | LgW | single_source |
| OEM-2-L | Rear defroster relay | low_side_out | PROTEUS-Black35-12 | Lowside 15 | low_side_out | LR | single_source |
| OEM-2-M | Throttle position (TPS) | analog_in | PROTEUS-White35-24 | Analog Volt 2 | analog_in | RB | single_source |
| OEM-2-N | O2 sensor | lambda_nb_in | PROTEUS-White35-14 | Analog Volt 3 | analog_in | RL | single_source |
| OEM-2-O | Mass air flow (MAF) | analog_in | PROTEUS-White35-13 | Analog Volt 1 | analog_in | R | single_source |
| OEM-2-P | Intake air temperature (IAT) | temp_in | PROTEUS-White35-30 | Intake air temp (IAT) | temp_in | RB | single_source |
| OEM-2-Q | Coolant temperature (ECT) | temp_in | PROTEUS-White35-20 | Coolant temp (CLT) | temp_in | LW | single_source |
| OEM-2-R | PRC solenoid (fuel pressure regulator) | low_side_out | PROTEUS-Black35-6 | Injector 6 | injector_out | YG | single_source |
| OEM-2-S | Condenser fan relay | low_side_out | PROTEUS-Black35-21 | Lowside 12 | low_side_out | LW | single_source |
| OEM-2-T | Fuel pump relay | low_side_out | PROTEUS-Black35-10 | Lowside 13 | low_side_out | Lg | single_source |
| OEM-2-U | Injector 1 | injector_out | PROTEUS-Black35-3 | Injector 1 | injector_out | Y | single_source |
| OEM-2-V | Injector 2 | injector_out | PROTEUS-Black35-15 | Injector 2 | injector_out | YB | single_source |
| OEM-2-W | ISC solenoid | low_side_out | PROTEUS-Black35-23 | Lowside 16 | low_side_out | LOr | single_source |
| OEM-2-X | Evap purge solenoid | low_side_out | PROTEUS-Black35-7 | Injector 7 | injector_out | YR | single_source |
| OEM-2-Y | Injector 3 | injector_out | PROTEUS-Black35-4 | Injector 3 | injector_out | GW | single_source |
| OEM-2-Z | Injector 4 | injector_out | PROTEUS-Black35-16 | Injector 4 | injector_out | G | single_source |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-1-B | SP-14V-1 | 0.85 | no route | ECU power +14V (main relay) | — | |
| W2 | SP-14V-1 | PROTEUS-Black23-23 | 0.85 | no route | Main relay feed | — | |
| W3 | OEM-2-A | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W4 | OEM-2-B | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W5 | SP-GND-1 | PROTEUS-Black23-14 | 0.85 | no route | Power ground | — | |
| W6 | SP-GND-1 | PROTEUS-Black23-19 | 0.85 | no route | Power ground | — | |
| W7 | SP-GND-1 | PROTEUS-Black23-20 | 0.85 | no route | Power ground | — | |
| W8 | SP-GND-1 | PROTEUS-Black35-17 | 0.85 | no route | Power ground | — | |
| W9 | SP-GND-1 | PROTEUS-Black35-18 | 0.85 | no route | Power ground | — | |
| W10 | SP-GND-1 | PROTEUS-Black35-24 | 0.85 | no route | Power ground | — | |
| W11 | OEM-2-C | SP-0V-1 | 0.5 | no route | Sensor ground (E2) | — | |
| W12 | OEM-2-D | SP-0V-1 | 0.5 | no route | Sensor ground (E2) | — | |
| W13 | OEM-2-F | SP-0V-1 | 0.5 | no route | MAF ground | — | |
| W14 | SP-0V-1 | PROTEUS-White35-1 | 0.5 | no route | Sensor ground | — | |
| W15 | SP-0V-1 | PROTEUS-White35-2 | 0.5 | no route | Sensor ground | — | |
| W16 | SP-0V-1 | PROTEUS-White35-23 | 0.5 | no route | Sensor ground | — | |
| W17 | SP-0V-1 | PROTEUS-White35-29 | 0.5 | no route | Sensor ground | — | |
| W18 | SP-0V-1 | PROTEUS-White35-3 | 0.5 | no route | Sensor ground | — | |
| W19 | SP-0V-1 | PROTEUS-White35-4 | 0.5 | no route | Sensor ground | — | |
| W20 | SP-0V-1 | PROTEUS-White35-5 | 0.5 | no route | Sensor ground | — | |
| W21 | SP-0V-1 | PROTEUS-White35-6 | 0.5 | no route | Sensor ground | — | |
| W22 | SP-0V-1 | PROTEUS-White35-7 | 0.5 | no route | Sensor ground | — | |
| W23 | SP-0V-1 | PROTEUS-White35-8 | 0.5 | no route | Sensor ground | — | |
| W24 | OEM-2-K | PROTEUS-White35-10 | 0.5 | no route | +5V sensor supply | — | |
| W25 | OEM-2-E | PROTEUS-Black23-5 | 0.5 | no route | Crank position (CAS NE) | — | |
| W26 | SP-0V-1 | PROTEUS-Black23-13 | 0.5 | no route | VR 1 negative | — | |
| W27 | OEM-2-G | PROTEUS-Black23-1 | 0.5 | no route | Cam position (CAS G) | — | |
| W28 | OEM-1-G | PROTEUS-Black35-35 | 0.5 | no route | Ignition 1 (coils 1+4, wasted spark) | — | |
| W29 | OEM-1-H | PROTEUS-Black35-34 | 0.5 | no route | Ignition 2 (coils 2+3, wasted spark) | — | |
| W30 | OEM-2-U | PROTEUS-Black35-3 | 0.5 | no route | Injector 1 | — | |
| W31 | OEM-2-V | PROTEUS-Black35-15 | 0.5 | no route | Injector 2 | — | |
| W32 | OEM-2-Y | PROTEUS-Black35-4 | 0.5 | no route | Injector 3 | — | |
| W33 | OEM-2-Z | PROTEUS-Black35-16 | 0.5 | no route | Injector 4 | — | |
| W34 | OEM-1-J | PROTEUS-Black35-20 | 0.5 | no route | A/C relay | — | |
| W35 | OEM-1-R | PROTEUS-Black35-9 | 0.5 | no route | Cooling fan relay | — | |
| W36 | OEM-2-S | PROTEUS-Black35-21 | 0.5 | no route | Condenser fan relay | — | |
| W37 | OEM-2-T | PROTEUS-Black35-10 | 0.5 | no route | Fuel pump relay | — | |
| W38 | OEM-1-L | PROTEUS-Black35-11 | 0.5 | no route | Coolant fan relay | — | |
| W39 | OEM-2-L | PROTEUS-Black35-12 | 0.5 | no route | Rear defroster relay | — | |
| W40 | OEM-2-W | PROTEUS-Black35-23 | 0.5 | no route | ISC solenoid | — | |
| W41 | OEM-1-E | PROTEUS-Black35-5 | 0.5 | no route | Malfunction indicator lamp (MIL) | — | |
| W42 | OEM-2-R | PROTEUS-Black35-6 | 0.5 | no route | PRC solenoid (fuel pressure regulator) | — | |
| W43 | OEM-2-X | PROTEUS-Black35-7 | 0.5 | no route | Evap purge solenoid | — | |
| W44 | OEM-2-O | PROTEUS-White35-13 | 0.5 | no route | Mass air flow (MAF) | — | |
| W45 | OEM-2-M | PROTEUS-White35-24 | 0.5 | no route | Throttle position (TPS) | — | |
| W46 | OEM-2-N | PROTEUS-White35-14 | 0.5 | no route | O2 sensor | — | |
| W47 | OEM-2-Q | PROTEUS-White35-20 | 0.5 | no route | Coolant temperature (ECT) | — | |
| W48 | OEM-2-P | PROTEUS-White35-30 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W49 | OEM-1-M | PROTEUS-Black23-2 | 0.5 | no route | Vehicle speed | — | |
| W50 | OEM-1-C | PROTEUS-Black23-10 | 0.5 | no route | Start signal | — | |
| W51 | OEM-1-O | PROTEUS-Black23-3 | 0.5 | no route | Stop light switch | — | |
| W52 | OEM-1-P | PROTEUS-Black23-9 | 0.5 | no route | Power steering pressure switch | — | |
| W53 | OEM-1-Q | PROTEUS-Black23-11 | 0.5 | no route | A/C request | — | |
| W54 | OEM-1-V | PROTEUS-White35-25 | 0.5 | no route | Neutral/clutch switch | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|---|---|---|---|---|
| connector | 174515-6 | TE | AMP Multilock .040/.070 hybrid 22-pin female harness plug (Miata NA/NB ECU) | 1.000 | ea |
| connector | 174516-6 | TE | AMP Multilock .040/.070 hybrid 26-pin female harness plug (Miata NA/NB ECU) | 1.000 | ea |
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 |
|---|---|---|---|
| warn | NET_FAMILY | OEM-1-V ↔ PROTEUS-White35-25 | OEM-1-V "Neutral/clutch switch" [digital_in] is wired to PROTEUS-White35-25 "Analog Volt 4" [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-1-E ↔ PROTEUS-Black35-5 | OEM-1-E "Malfunction indicator lamp (MIL)" [low_side_out] is wired to PROTEUS-Black35-5 "Injector 5" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-2-R ↔ PROTEUS-Black35-6 | OEM-2-R "PRC solenoid (fuel pressure regulator)" [low_side_out] is wired to PROTEUS-Black35-6 "Injector 6" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-2-X ↔ PROTEUS-Black35-7 | OEM-2-X "Evap purge solenoid" [low_side_out] is wired to PROTEUS-Black35-7 "Injector 7" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | PROTEUS-White35-29 ↔ PROTEUS-Black23-13 | PROTEUS-White35-29 "Sensor ground" [sensor_ground] is wired to PROTEUS-Black23-13 "VR 1 negative" [trigger_in]. Trigger return tied to sensor/trigger ground: correct for single-ended trigger inputs. |
| info | UNMAPPED | OEM | 9 optional OEM pins are not mapped: OEM-1-D Data link connector; OEM-1-I Powertrain control module (transmission); OEM-1-N Powertrain control module (transmission); OEM-1-S Heater control unit; OEM-1-T Unknown; OEM-1-U Unknown; OEM-2-H Data link connector; OEM-2-I Tachometer output; OEM-2-J EGR function sensor |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-1-A | 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-1 A: Constant +12V: rusEFI Proteus has no battery-constant input; not needed - OEM-2 I: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on rusEFI Proteus - OEM-1 D: Data link connector: no free k_line on rusEFI Proteus - OEM-2 H: Data link connector: no free k_line on rusEFI Proteus - OEM-1 I: Powertrain control module (transmission): not classified in the library; wire by hand - OEM-1 N: Powertrain control module (transmission): not classified in the library; wire by hand - OEM-1 S: Heater control unit: not classified in the library; wire by hand - OEM-1 T: Unknown: not classified in the library; wire by hand - OEM-1 U: Unknown: not classified in the library; wire by hand - OEM-2 J: EGR function sensor: not classified in the library; wire by hand - PROTEUS-Black23 18: Ignition switch in: not fed (the stock ECU has no ignition-sense pin); feed it from a switched-ignition source
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | Link G4X MX5X install manual (NA 1.6/1.8) | https://linkecu.com/documentation/MX5X.pdf | archive | 2026-10-05 | b7f730de9f6e |
| 4 | vendor_doc | rusEFI Proteus — board connector definitions (Black35 / White35 / Black23) | https://github.com/rusefi/rusefi/tree/master/firmware/config/boards/proteus/connectors | archive | 2026-10-05 | 738a2ea934c0 |
| 2 | expert_report | Justin Barrera — Miata NA/NB wiring corrections | — | — | — | — |
| 2 | community_copy | rusefi wiki: 1994 Mazda Miata 1.8 (NA8) ECU pinout | https://github.com/rusefi/rusefi/wiki/Mazda-Miata-1994 | — | 2026-10-08 | 075801b907f4 |