MX-5 Miata NA6 1990-93 (B6-ZE, 1.6) → rusEFI Proteus (auto)
MX-5 Miata NA6 1990-93 (B6-ZE, 1.6) — rusEFI — Proteus
Drawn by Michael Gnankou · Rev 0 · proposal · 2026-10-08
Before you start
| Status | proposal · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | none |
| Size of the job | 45 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 | OEM-2-C | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-2-D | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | SP-GND-1 | PROTEUS-Black23-14 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | PROTEUS-Black23-19 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | PROTEUS-Black23-20 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-GND-1 | PROTEUS-Black35-17 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-GND-1 | PROTEUS-Black35-18 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | SP-GND-1 | PROTEUS-Black35-24 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| 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-E | PROTEUS-Black35-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-2-I | PROTEUS-Black35-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-2-O | PROTEUS-White35-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-2-N | PROTEUS-White35-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-2-Q | PROTEUS-White35-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-2-P | PROTEUS-White35-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-1-C | PROTEUS-Black23-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-1-N | PROTEUS-Black23-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-1-P | PROTEUS-Black23-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-1-Q | PROTEUS-Black23-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-1-V | PROTEUS-Black23-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-2-L | PROTEUS-White35-14 | 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 |
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 | — | W40 | — | 0.5 | PROTEUS-Black23-10 | — | — | — |
| E | Malfunction indicator lamp (MIL) | — | W34 | — | 0.5 | PROTEUS-Black35-20 | — | — | — |
| 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 | — | — | — |
| N | Wide-open throttle switch | — | W41 | — | 0.5 | PROTEUS-Black23-3 | — | — | — |
| P | Power steering pressure switch | — | W42 | — | 0.5 | PROTEUS-Black23-9 | — | — | — |
| Q | A/C request | — | W43 | — | 0.5 | PROTEUS-Black23-11 | — | — | — |
| V | Neutral/clutch switch | — | W44 | — | 0.5 | PROTEUS-Black23-2 | — | — | — |
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 | Power ground | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| D | Power ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| E | Crank position (CAS NE) | — | W25 | — | 0.5 | PROTEUS-Black23-5 | — | — | — |
| F | AFM ground | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| G | Cam position (CAS G) | — | W27 | — | 0.5 | PROTEUS-Black23-1 | — | — | — |
| I | Tachometer output | — | W35 | — | 0.5 | PROTEUS-Black35-9 | — | — | — |
| K | +5V sensor supply | — | W24 | — | 0.5 | PROTEUS-White35-10 | — | — | — |
| L | Idle switch (TPS) | — | W45 | — | 0.5 | PROTEUS-White35-14 | — | — | — |
| N | O2 sensor | — | W37 | — | 0.5 | PROTEUS-White35-24 | — | — | — |
| O | Air flow meter (AFM) | — | W36 | — | 0.5 | PROTEUS-White35-13 | — | — | — |
| P | Intake air temperature (IAT) | — | W39 | — | 0.5 | PROTEUS-White35-30 | — | — | — |
| Q | Coolant temperature (ECT) | — | W38 | — | 0.5 | PROTEUS-White35-20 | — | — | — |
| U | Injector 1 | — | W30 | — | 0.5 | PROTEUS-Black35-3 | — | — | — |
| V | Injector 2 | — | W31 | — | 0.5 | PROTEUS-Black35-15 | — | — | — |
| 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 | — | W40 | — | 0.5 | OEM-1-C | — | — | — |
| 11 | Digital 6 | — | W43 | — | 0.5 | OEM-1-Q | — | — | — |
| 12 | VR 2 negative | — | — | — | — | — | — | — | — |
| 13 | VR 1 negative | — | W26 | — | 0.5 | SP-0V-1 | — | — | — |
| 14 | Power ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 15 | ETB 2 positive | — | — | — | — | — | — | — | — |
| 16 | CAN 1 Low | — | — | — | — | — | — | — | — |
| 17 | CAN 1 High | — | — | — | — | — | — | — | — |
| 18 | Ignition switch in | — | — | — | — | — | — | — | — |
| 19 | Power ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 2 | Digital 3 | — | W44 | — | 0.5 | OEM-1-V | — | — | — |
| 20 | Power ground | — | W9 | — | 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 | — | W41 | — | 0.5 | OEM-1-N | — | — | — |
| 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 | — | W42 | — | 0.5 | OEM-1-P | — | — | — |
PROTEUS-Black35
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Highside 2 | — | — | — | — | — | — | — | — |
| 10 | Lowside 13 | — | — | — | — | — | — | — | — |
| 11 | Lowside 14 | — | — | — | — | — | — | — | — |
| 12 | Lowside 15 | — | — | — | — | — | — | — | — |
| 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 | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
| 18 | Power ground | — | W11 | — | 0.85 | SP-GND-1 | — | — | — |
| 19 | Injector 8 | — | — | — | — | — | — | — | — |
| 2 | Highside 1 | — | — | — | — | — | — | — | — |
| 20 | Lowside 10 | — | W34 | — | 0.5 | OEM-1-E | — | — | — |
| 21 | Lowside 12 | — | — | — | — | — | — | — | — |
| 22 | Ignition 3 | — | — | — | — | — | — | — | — |
| 23 | Lowside 16 | — | — | — | — | — | — | — | — |
| 24 | Power ground | — | W12 | — | 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 | — | — | — | — | — | — | — | — |
| 6 | Injector 6 | — | — | — | — | — | — | — | — |
| 7 | Injector 7 | — | — | — | — | — | — | — | — |
| 8 | Injector 9 | — | — | — | — | — | — | — | — |
| 9 | Lowside 11 | — | W35 | — | 0.5 | OEM-2-I | — | — | — |
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 | — | W36 | — | 0.5 | OEM-2-O | — | — | — |
| 14 | Analog Volt 3 | — | W45 | — | 0.5 | OEM-2-L | — | — | — |
| 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) | — | W38 | — | 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 | — | W37 | — | 0.5 | OEM-2-N | — | — | — |
| 25 | Analog Volt 4 | — | — | — | — | — | — | — | — |
| 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) | — | W39 | — | 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 | — | — | 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 | OEM-2-C | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-2-D | — | — | — |
| 1 | — | — | W7 | — | 0.85 | PROTEUS-Black23-14 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | PROTEUS-Black23-19 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | PROTEUS-Black23-20 | — | — | — |
| 1 | — | — | W10 | — | 0.85 | PROTEUS-Black35-17 | — | — | — |
| 1 | — | — | W11 | — | 0.85 | PROTEUS-Black35-18 | — | — | — |
| 1 | — | — | W12 | — | 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 | — | — | — | single_source | |
| OEM-1-B | ECU power +14V (main relay) | power_in | PROTEUS-Black23-23 | Main relay feed | power_in | single_source | |
| OEM-1-C | Start signal | digital_in | PROTEUS-Black23-10 | Digital 1 | digital_in | single_source | |
| OEM-1-E | Malfunction indicator lamp (MIL) | low_side_out | PROTEUS-Black35-20 | Lowside 10 | low_side_out | single_source | |
| OEM-1-G | Ignition 1 (coils 1+4, wasted spark) | ignition_out | PROTEUS-Black35-35 | Ignition 1 | ignition_out | single_source | |
| OEM-1-H | Ignition 2 (coils 2+3, wasted spark) | ignition_out | PROTEUS-Black35-34 | Ignition 2 | ignition_out | single_source | |
| OEM-1-N | Wide-open throttle switch | digital_in | PROTEUS-Black23-3 | Digital 4 | digital_in | single_source | |
| OEM-1-P | Power steering pressure switch | digital_in | PROTEUS-Black23-9 | Digital 5 | digital_in | single_source | |
| OEM-1-Q | A/C request | digital_in | PROTEUS-Black23-11 | Digital 6 | digital_in | single_source | |
| OEM-1-V | Neutral/clutch switch | digital_in | PROTEUS-Black23-2 | Digital 3 | digital_in | 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 | 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 | single_source | |
| OEM-2-C | 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 | single_source | |
| OEM-2-D | 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 | single_source | |
| OEM-2-E | Crank position (CAS NE) | trigger_in | PROTEUS-Black23-5 | VR 1 positive | trigger_in | single_source | |
| OEM-2-F | AFM 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 | single_source | |
| OEM-2-G | Cam position (CAS G) | trigger_in | PROTEUS-Black23-1 | Digital 2 | trigger_in | single_source | |
| OEM-2-I | Tachometer output | tacho_out | PROTEUS-Black35-9 | Lowside 11 | low_side_out | single_source | |
| OEM-2-K | +5V sensor supply | vref | PROTEUS-White35-10 | 5V supply #2 | vref | single_source | |
| OEM-2-L | Idle switch (TPS) | digital_in | PROTEUS-White35-14 | Analog Volt 3 | analog_in | single_source | |
| OEM-2-N | O2 sensor | lambda_nb_in | PROTEUS-White35-24 | Analog Volt 2 | analog_in | single_source | |
| OEM-2-O | Air flow meter (AFM) | analog_in | PROTEUS-White35-13 | Analog Volt 1 | analog_in | single_source | |
| OEM-2-P | Intake air temperature (IAT) | temp_in | PROTEUS-White35-30 | Intake air temp (IAT) | temp_in | single_source | |
| OEM-2-Q | Coolant temperature (ECT) | temp_in | PROTEUS-White35-20 | Coolant temp (CLT) | temp_in | single_source | |
| OEM-2-U | Injector 1 | injector_out | PROTEUS-Black35-3 | Injector 1 | injector_out | single_source | |
| OEM-2-V | Injector 2 | injector_out | PROTEUS-Black35-15 | Injector 2 | injector_out | single_source | |
| OEM-2-Y | Injector 3 | injector_out | PROTEUS-Black35-4 | Injector 3 | injector_out | single_source | |
| OEM-2-Z | Injector 4 | injector_out | PROTEUS-Black35-16 | Injector 4 | injector_out | 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 | OEM-2-C | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W6 | OEM-2-D | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W7 | SP-GND-1 | PROTEUS-Black23-14 | 0.85 | no route | Power ground | — | |
| W8 | SP-GND-1 | PROTEUS-Black23-19 | 0.85 | no route | Power ground | — | |
| W9 | SP-GND-1 | PROTEUS-Black23-20 | 0.85 | no route | Power ground | — | |
| W10 | SP-GND-1 | PROTEUS-Black35-17 | 0.85 | no route | Power ground | — | |
| W11 | SP-GND-1 | PROTEUS-Black35-18 | 0.85 | no route | Power ground | — | |
| W12 | SP-GND-1 | PROTEUS-Black35-24 | 0.85 | no route | Power ground | — | |
| W13 | OEM-2-F | SP-0V-1 | 0.5 | no route | AFM 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-E | PROTEUS-Black35-20 | 0.5 | no route | Malfunction indicator lamp (MIL) | — | |
| W35 | OEM-2-I | PROTEUS-Black35-9 | 0.5 | no route | Tachometer output | — | |
| W36 | OEM-2-O | PROTEUS-White35-13 | 0.5 | no route | Air flow meter (AFM) | — | |
| W37 | OEM-2-N | PROTEUS-White35-24 | 0.5 | no route | O2 sensor | — | |
| W38 | OEM-2-Q | PROTEUS-White35-20 | 0.5 | no route | Coolant temperature (ECT) | — | |
| W39 | OEM-2-P | PROTEUS-White35-30 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W40 | OEM-1-C | PROTEUS-Black23-10 | 0.5 | no route | Start signal | — | |
| W41 | OEM-1-N | PROTEUS-Black23-3 | 0.5 | no route | Wide-open throttle switch | — | |
| W42 | OEM-1-P | PROTEUS-Black23-9 | 0.5 | no route | Power steering pressure switch | — | |
| W43 | OEM-1-Q | PROTEUS-Black23-11 | 0.5 | no route | A/C request | — | |
| W44 | OEM-1-V | PROTEUS-Black23-2 | 0.5 | no route | Neutral/clutch switch | — | |
| W45 | OEM-2-L | PROTEUS-White35-14 | 0.5 | no route | Idle switch (TPS) | — |
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 (3)
| Severity | Code | Subject | Message |
|---|---|---|---|
| warn | NET_FAMILY | OEM-2-L ↔ PROTEUS-White35-14 | OEM-2-L "Idle switch (TPS)" [digital_in] is wired to PROTEUS-White35-14 "Analog Volt 3" [analog_in]. Analog and digital on one net. A switch on an analog input works with a pull-up and a threshold; an analog sensor on a digital input loses its value. |
| info | NET_FAMILY | OEM-2-F ↔ PROTEUS-Black23-13 | OEM-2-F "AFM 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 | NET_FAMILY | OEM-2-I ↔ PROTEUS-Black35-9 | OEM-2-I "Tachometer output" [tacho_out] is wired to PROTEUS-Black35-9 "Lowside 11" [low_side_out]. Tacho as a low-side output: check the tach needs a pull-up. |
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 2026-10-06. Review every wire against both manuals before building. Not wired: - OEM-1 A: Constant +12V: rusEFI Proteus has no battery-constant input; not needed - 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 |