MX-5 Miata NA8 1994-97 (BP-ZE, 1.8) → ECUMASTER EMU Black (auto)
MX-5 Miata NA8 1994-97 (BP-ZE, 1.8) — ECUMASTER — EMU Black
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 | 41 wires · 7 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 | EMUBLACK-Black-13 | 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 | EMUBLACK-Black-27 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | EMUBLACK-Black-28 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | EMUBLACK-Grey-17 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-GND-1 | EMUBLACK-Grey-24 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-2-F | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | SP-0V-1 | EMUBLACK-Black-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | SP-0V-1 | EMUBLACK-Black-38 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | SP-0V-1 | EMUBLACK-Black-39 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-2-K | EMUBLACK-Black-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-2-E | EMUBLACK-Black-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-2-G | EMUBLACK-Black-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-1-G | EMUBLACK-Grey-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-1-H | EMUBLACK-Grey-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-2-U | EMUBLACK-Grey-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-2-V | EMUBLACK-Grey-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-2-Y | EMUBLACK-Grey-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-2-Z | EMUBLACK-Grey-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-1-J | EMUBLACK-Grey-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-1-R | EMUBLACK-Grey-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-2-S | EMUBLACK-Grey-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-2-T | EMUBLACK-Grey-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-2-W | EMUBLACK-Grey-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-1-E | EMUBLACK-Grey-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-2-R | EMUBLACK-Grey-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-2-X | EMUBLACK-Grey-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-2-O | EMUBLACK-Black-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-2-M | EMUBLACK-Black-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-2-N | EMUBLACK-Black-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-2-Q | EMUBLACK-Black-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-2-P | EMUBLACK-Black-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-1-M | EMUBLACK-Black-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-1-C | EMUBLACK-Black-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-1-P | EMUBLACK-Black-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-1-Q | EMUBLACK-Black-36 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-1-V | EMUBLACK-Black-17 | 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 | EMUBLACK-Black-13 | EMUBLACK-Black-27 | open (OL) | +12 V supply must not touch power ground | |
| 2 | EMUBLACK-Black-13 | EMUBLACK-Black-29 | open (OL) | +12 V supply must not touch sensor ground | |
| 3 | EMUBLACK-Black-13 | EMUBLACK-Black-26 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 4 | EMUBLACK-Black-27 | EMUBLACK-Black-26 | open (OL) | power ground must not touch 5 V sensor reference | |
| 5 | EMUBLACK-Black-29 | EMUBLACK-Black-26 | open (OL) | sensor ground must not touch 5 V sensor reference |
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
EMUBLACK-Black
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Ignition coil #5 | — | — | — | — | — | — | — | — |
| 10 | Switch #1 In | — | W38 | — | 0.5 | OEM-1-C | — | — | — |
| 11 | RS232 TXD | — | — | — | — | — | — | — | — |
| 12 | CAN H | — | — | — | — | — | — | — | — |
| 13 | Battery +12V | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 14 | Ignition coil #4 | — | — | — | — | — | — | — | — |
| 15 | EGT in #2 | — | — | — | — | — | — | — | — |
| 16 | Knock Sensor in #2 | — | — | — | — | — | — | — | — |
| 17 | Analog In #3 | — | W41 | — | 0.5 | OEM-1-V | — | — | — |
| 18 | TPS In | — | W33 | — | 0.5 | OEM-2-M | — | — | — |
| 19 | WBO Ip | — | — | — | — | — | — | — | — |
| 2 | EGT in #1 | — | — | — | — | — | — | — | — |
| 20 | VSS In | — | W37 | — | 0.5 | OEM-1-M | — | — | — |
| 21 | Camsync In #1 | — | W17 | — | 0.5 | OEM-2-G | — | — | — |
| 22 | WBO Rcal | — | — | — | — | — | — | — | — |
| 23 | Switch #2 In | — | W39 | — | 0.5 | OEM-1-P | — | — | — |
| 24 | RS232 RXD | — | — | — | — | — | — | — | — |
| 25 | CAN L | — | — | — | — | — | — | — | — |
| 26 | +5V supply | — | W15 | — | 0.5 | OEM-2-K | — | — | — |
| 27 | Power Ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 28 | Ecu Ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 29 | Sensor Ground | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 3 | Knock Sensor in #1 | — | — | — | — | — | — | — | — |
| 30 | Analog In #4 | — | — | — | — | — | — | — | — |
| 31 | Analog In #1 | — | W32 | — | 0.5 | OEM-2-O | — | — | — |
| 32 | IAT In | — | W35 | — | 0.5 | OEM-2-Q | — | — | — |
| 33 | WBO VGND | — | — | — | — | — | — | — | — |
| 34 | +5V supply | — | — | — | — | — | — | — | — |
| 35 | Analog In #5 | — | — | — | — | — | — | — | — |
| 36 | Switch #3 In | — | W40 | — | 0.5 | OEM-1-Q | — | — | — |
| 37 | Analog In #6 | — | — | — | — | — | — | — | — |
| 38 | Sensor Ground | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 39 | Sensor Ground | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 4 | Analog In #2 | — | W34 | — | 0.5 | OEM-2-N | — | — | — |
| 5 | CLT In | — | W36 | — | 0.5 | OEM-2-P | — | — | — |
| 6 | WBO Vs | — | — | — | — | — | — | — | — |
| 7 | Camsync In #2 | — | — | — | — | — | — | — | — |
| 8 | Primary trigger | — | W16 | — | 0.5 | OEM-2-E | — | — | — |
| 9 | Flex Fuel In | — | — | — | — | — | — | — | — |
EMUBLACK-Grey
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Ignition coil #6 | — | — | — | — | — | — | — | — |
| 10 | H-Bridge #1 Winding B | — | — | — | — | — | — | — | — |
| 11 | H-Bridge #2 Winding B | — | — | — | — | — | — | — | — |
| 12 | AUX 5 | — | W28 | — | 0.5 | OEM-2-W | — | — | — |
| 13 | AUX 2 / Injector #8 | — | W25 | — | 0.5 | OEM-1-R | — | — | — |
| 14 | Injector #5 | — | W30 | — | 0.5 | OEM-2-R | — | — | — |
| 15 | Injector #2 | — | W21 | — | 0.5 | OEM-2-V | — | — | — |
| 16 | Ignition coil #2 | — | W19 | — | 0.5 | OEM-1-H | — | — | — |
| 17 | Power Ground | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| 18 | Ignition +12V | — | — | — | — | — | — | — | — |
| 19 | WBO Heater | — | — | — | — | — | — | — | — |
| 2 | H-Bridge #1 Winding A | — | — | — | — | — | — | — | — |
| 20 | AUX 4 / Tacho | — | W27 | — | 0.5 | OEM-2-T | — | — | — |
| 21 | AUX 1 / Injector #7 | — | W24 | — | 0.5 | OEM-1-J | — | — | — |
| 22 | Injector #6 | — | W31 | — | 0.5 | OEM-2-X | — | — | — |
| 23 | Injector #3 | — | W22 | — | 0.5 | OEM-2-Y | — | — | — |
| 24 | Power Ground | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
| 3 | H-Bridge #2 Winding A | — | — | — | — | — | — | — | — |
| 4 | AUX 6 | — | W29 | — | 0.5 | OEM-1-E | — | — | — |
| 5 | AUX 3 | — | W26 | — | 0.5 | OEM-2-S | — | — | — |
| 6 | Injector #4 | — | W23 | — | 0.5 | OEM-2-Z | — | — | — |
| 7 | Injector #1 | — | W20 | — | 0.5 | OEM-2-U | — | — | — |
| 8 | Ignition coil #1 | — | W18 | — | 0.5 | OEM-1-G | — | — | — |
| 9 | Ignition coil #3 | — | — | — | — | — | — | — | — |
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 | — | W38 | — | 0.5 | EMUBLACK-Black-10 | — | — | — |
| E | Malfunction indicator lamp (MIL) | — | W29 | — | 0.5 | EMUBLACK-Grey-4 | — | — | — |
| G | Ignition 1 (coils 1+4, wasted spark) | — | W18 | — | 0.5 | EMUBLACK-Grey-8 | — | — | — |
| H | Ignition 2 (coils 2+3, wasted spark) | — | W19 | — | 0.5 | EMUBLACK-Grey-16 | — | — | — |
| J | A/C relay | — | W24 | — | 0.5 | EMUBLACK-Grey-21 | — | — | — |
| M | Vehicle speed | — | W37 | — | 0.5 | EMUBLACK-Black-20 | — | — | — |
| P | Power steering pressure switch | — | W39 | — | 0.5 | EMUBLACK-Black-23 | — | — | — |
| Q | A/C request | — | W40 | — | 0.5 | EMUBLACK-Black-36 | — | — | — |
| R | Cooling fan relay | — | W25 | — | 0.5 | EMUBLACK-Grey-13 | — | — | — |
| V | Neutral/clutch switch | — | W41 | — | 0.5 | EMUBLACK-Black-17 | — | — | — |
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) | — | W16 | — | 0.5 | EMUBLACK-Black-8 | — | — | — |
| F | MAF ground | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| G | Cam position (CAS G) | — | W17 | — | 0.5 | EMUBLACK-Black-21 | — | — | — |
| I | Tachometer output | — | — | — | — | — | — | — | — |
| K | +5V sensor supply | — | W15 | — | 0.5 | EMUBLACK-Black-26 | — | — | — |
| M | Throttle position (TPS) | — | W33 | — | 0.5 | EMUBLACK-Black-18 | — | — | — |
| N | O2 sensor | — | W34 | — | 0.5 | EMUBLACK-Black-4 | — | — | — |
| O | Mass air flow (MAF) | — | W32 | — | 0.5 | EMUBLACK-Black-31 | — | — | — |
| P | Intake air temperature (IAT) | — | W36 | — | 0.5 | EMUBLACK-Black-5 | — | — | — |
| Q | Coolant temperature (ECT) | — | W35 | — | 0.5 | EMUBLACK-Black-32 | — | — | — |
| R | PRC solenoid (fuel pressure regulator) | — | W30 | — | 0.5 | EMUBLACK-Grey-14 | — | — | — |
| S | Condenser fan relay | — | W26 | — | 0.5 | EMUBLACK-Grey-5 | — | — | — |
| T | Fuel pump relay | — | W27 | — | 0.5 | EMUBLACK-Grey-20 | — | — | — |
| U | Injector 1 | — | W20 | — | 0.5 | EMUBLACK-Grey-7 | — | — | — |
| V | Injector 2 | — | W21 | — | 0.5 | EMUBLACK-Grey-15 | — | — | — |
| W | ISC solenoid | — | W28 | — | 0.5 | EMUBLACK-Grey-12 | — | — | — |
| X | Evap purge solenoid | — | W31 | — | 0.5 | EMUBLACK-Grey-22 | — | — | — |
| Y | Injector 3 | — | W22 | — | 0.5 | EMUBLACK-Grey-23 | — | — | — |
| Z | Injector 4 | — | W23 | — | 0.5 | EMUBLACK-Grey-6 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W11 | — | 0.5 | OEM-2-F | — | — | — |
| 1 | — | — | W12 | — | 0.5 | EMUBLACK-Black-29 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | EMUBLACK-Black-38 | — | — | — |
| 1 | — | — | W14 | — | 0.5 | EMUBLACK-Black-39 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-1-B | — | — | — |
| 1 | — | — | W2 | — | 0.85 | EMUBLACK-Black-13 | — | — | — |
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 | EMUBLACK-Black-27 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | EMUBLACK-Black-28 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | EMUBLACK-Grey-17 | — | — | — |
| 1 | — | — | W10 | — | 0.85 | EMUBLACK-Grey-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 | EMUBLACK-Black-13 | Battery +12V | power_in | single_source | |
| OEM-1-C | Start signal | digital_in | EMUBLACK-Black-10 | Switch #1 In | digital_in | single_source | |
| OEM-1-E | Malfunction indicator lamp (MIL) | low_side_out | EMUBLACK-Grey-4 | AUX 6 | low_side_out | single_source | |
| OEM-1-G | Ignition 1 (coils 1+4, wasted spark) | ignition_out | EMUBLACK-Grey-8 | Ignition coil #1 | ignition_out | single_source | |
| OEM-1-H | Ignition 2 (coils 2+3, wasted spark) | ignition_out | EMUBLACK-Grey-16 | Ignition coil #2 | ignition_out | single_source | |
| OEM-1-J | A/C relay | low_side_out | EMUBLACK-Grey-21 | AUX 1 / Injector #7 | low_side_out | single_source | |
| OEM-1-M | Vehicle speed | digital_in | EMUBLACK-Black-20 | VSS In | digital_in | single_source | |
| OEM-1-P | Power steering pressure switch | digital_in | EMUBLACK-Black-23 | Switch #2 In | digital_in | single_source | |
| OEM-1-Q | A/C request | digital_in | EMUBLACK-Black-36 | Switch #3 In | digital_in | single_source | |
| OEM-1-R | Cooling fan relay | low_side_out | EMUBLACK-Grey-13 | AUX 2 / Injector #8 | low_side_out | single_source | |
| OEM-1-V | Neutral/clutch switch | digital_in | EMUBLACK-Black-17 | Analog In #3 | analog_in | single_source | |
| OEM-2-A | Power ground | ground | EMUBLACK-Black-27 + EMUBLACK-Black-28 + EMUBLACK-Grey-17 + EMUBLACK-Grey-24 | Power Ground + Ecu Ground + Power Ground + Power Ground | ground | single_source | |
| OEM-2-B | Power ground | ground | EMUBLACK-Black-27 + EMUBLACK-Black-28 + EMUBLACK-Grey-17 + EMUBLACK-Grey-24 | Power Ground + Ecu Ground + Power Ground + Power Ground | ground | single_source | |
| OEM-2-C | Power ground | ground | EMUBLACK-Black-27 + EMUBLACK-Black-28 + EMUBLACK-Grey-17 + EMUBLACK-Grey-24 | Power Ground + Ecu Ground + Power Ground + Power Ground | ground | single_source | |
| OEM-2-D | Power ground | ground | EMUBLACK-Black-27 + EMUBLACK-Black-28 + EMUBLACK-Grey-17 + EMUBLACK-Grey-24 | Power Ground + Ecu Ground + Power Ground + Power Ground | ground | single_source | |
| OEM-2-E | Crank position (CAS NE) | trigger_in | EMUBLACK-Black-8 | Primary trigger | trigger_in | single_source | |
| OEM-2-F | MAF ground | sensor_ground | EMUBLACK-Black-29 + EMUBLACK-Black-38 + EMUBLACK-Black-39 | Sensor Ground + Sensor Ground + Sensor Ground | sensor_ground | single_source | |
| OEM-2-G | Cam position (CAS G) | trigger_in | EMUBLACK-Black-21 | Camsync In #1 | trigger_in | single_source | |
| OEM-2-I | Tachometer output | tacho_out | — | — | — | single_source | |
| OEM-2-K | +5V sensor supply | vref | EMUBLACK-Black-26 | +5V supply | vref | single_source | |
| OEM-2-M | Throttle position (TPS) | analog_in | EMUBLACK-Black-18 | TPS In | analog_in | single_source | |
| OEM-2-N | O2 sensor | lambda_nb_in | EMUBLACK-Black-4 | Analog In #2 | analog_in | single_source | |
| OEM-2-O | Mass air flow (MAF) | analog_in | EMUBLACK-Black-31 | Analog In #1 | analog_in | single_source | |
| OEM-2-P | Intake air temperature (IAT) | temp_in | EMUBLACK-Black-5 | CLT In | temp_in | single_source | |
| OEM-2-Q | Coolant temperature (ECT) | temp_in | EMUBLACK-Black-32 | IAT In | temp_in | single_source | |
| OEM-2-R | PRC solenoid (fuel pressure regulator) | low_side_out | EMUBLACK-Grey-14 | Injector #5 | injector_out | single_source | |
| OEM-2-S | Condenser fan relay | low_side_out | EMUBLACK-Grey-5 | AUX 3 | low_side_out | single_source | |
| OEM-2-T | Fuel pump relay | low_side_out | EMUBLACK-Grey-20 | AUX 4 / Tacho | low_side_out | single_source | |
| OEM-2-U | Injector 1 | injector_out | EMUBLACK-Grey-7 | Injector #1 | injector_out | single_source | |
| OEM-2-V | Injector 2 | injector_out | EMUBLACK-Grey-15 | Injector #2 | injector_out | single_source | |
| OEM-2-W | ISC solenoid | low_side_out | EMUBLACK-Grey-12 | AUX 5 | low_side_out | single_source | |
| OEM-2-X | Evap purge solenoid | low_side_out | EMUBLACK-Grey-22 | Injector #6 | injector_out | single_source | |
| OEM-2-Y | Injector 3 | injector_out | EMUBLACK-Grey-23 | Injector #3 | injector_out | single_source | |
| OEM-2-Z | Injector 4 | injector_out | EMUBLACK-Grey-6 | 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 | EMUBLACK-Black-13 | 0.85 | no route | Battery +12V | — | |
| 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 | EMUBLACK-Black-27 | 0.85 | no route | Power Ground | — | |
| W8 | SP-GND-1 | EMUBLACK-Black-28 | 0.85 | no route | Ecu Ground | — | |
| W9 | SP-GND-1 | EMUBLACK-Grey-17 | 0.85 | no route | Power Ground | — | |
| W10 | SP-GND-1 | EMUBLACK-Grey-24 | 0.85 | no route | Power Ground | — | |
| W11 | OEM-2-F | SP-0V-1 | 0.5 | no route | MAF ground | — | |
| W12 | SP-0V-1 | EMUBLACK-Black-29 | 0.5 | no route | Sensor Ground | — | |
| W13 | SP-0V-1 | EMUBLACK-Black-38 | 0.5 | no route | Sensor Ground | — | |
| W14 | SP-0V-1 | EMUBLACK-Black-39 | 0.5 | no route | Sensor Ground | — | |
| W15 | OEM-2-K | EMUBLACK-Black-26 | 0.5 | no route | +5V sensor supply | — | |
| W16 | OEM-2-E | EMUBLACK-Black-8 | 0.5 | no route | Crank position (CAS NE) | — | |
| W17 | OEM-2-G | EMUBLACK-Black-21 | 0.5 | no route | Cam position (CAS G) | — | |
| W18 | OEM-1-G | EMUBLACK-Grey-8 | 0.5 | no route | Ignition 1 (coils 1+4, wasted spark) | — | |
| W19 | OEM-1-H | EMUBLACK-Grey-16 | 0.5 | no route | Ignition 2 (coils 2+3, wasted spark) | — | |
| W20 | OEM-2-U | EMUBLACK-Grey-7 | 0.5 | no route | Injector 1 | — | |
| W21 | OEM-2-V | EMUBLACK-Grey-15 | 0.5 | no route | Injector 2 | — | |
| W22 | OEM-2-Y | EMUBLACK-Grey-23 | 0.5 | no route | Injector 3 | — | |
| W23 | OEM-2-Z | EMUBLACK-Grey-6 | 0.5 | no route | Injector 4 | — | |
| W24 | OEM-1-J | EMUBLACK-Grey-21 | 0.5 | no route | A/C relay | — | |
| W25 | OEM-1-R | EMUBLACK-Grey-13 | 0.5 | no route | Cooling fan relay | — | |
| W26 | OEM-2-S | EMUBLACK-Grey-5 | 0.5 | no route | Condenser fan relay | — | |
| W27 | OEM-2-T | EMUBLACK-Grey-20 | 0.5 | no route | Fuel pump relay | — | |
| W28 | OEM-2-W | EMUBLACK-Grey-12 | 0.5 | no route | ISC solenoid | — | |
| W29 | OEM-1-E | EMUBLACK-Grey-4 | 0.5 | no route | Malfunction indicator lamp (MIL) | — | |
| W30 | OEM-2-R | EMUBLACK-Grey-14 | 0.5 | no route | PRC solenoid (fuel pressure regulator) | — | |
| W31 | OEM-2-X | EMUBLACK-Grey-22 | 0.5 | no route | Evap purge solenoid | — | |
| W32 | OEM-2-O | EMUBLACK-Black-31 | 0.5 | no route | Mass air flow (MAF) | — | |
| W33 | OEM-2-M | EMUBLACK-Black-18 | 0.5 | no route | Throttle position (TPS) | — | |
| W34 | OEM-2-N | EMUBLACK-Black-4 | 0.5 | no route | O2 sensor | — | |
| W35 | OEM-2-Q | EMUBLACK-Black-32 | 0.5 | no route | Coolant temperature (ECT) | — | |
| W36 | OEM-2-P | EMUBLACK-Black-5 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W37 | OEM-1-M | EMUBLACK-Black-20 | 0.5 | no route | Vehicle speed | — | |
| W38 | OEM-1-C | EMUBLACK-Black-10 | 0.5 | no route | Start signal | — | |
| W39 | OEM-1-P | EMUBLACK-Black-23 | 0.5 | no route | Power steering pressure switch | — | |
| W40 | OEM-1-Q | EMUBLACK-Black-36 | 0.5 | no route | A/C request | — | |
| W41 | OEM-1-V | EMUBLACK-Black-17 | 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 (4)
| Severity | Code | Subject | Message |
|---|---|---|---|
| warn | NET_FAMILY | OEM-1-V ↔ EMUBLACK-Black-17 | OEM-1-V "Neutral/clutch switch" [digital_in] is wired to EMUBLACK-Black-17 "Analog In #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-R ↔ EMUBLACK-Grey-14 | OEM-2-R "PRC solenoid (fuel pressure regulator)" [low_side_out] is wired to EMUBLACK-Grey-14 "Injector #5" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-2-X ↔ EMUBLACK-Grey-22 | OEM-2-X "Evap purge solenoid" [low_side_out] is wired to EMUBLACK-Grey-22 "Injector #6" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | UNMAPPED | OEM | 1 optional OEM pins are not mapped: OEM-2-I Tachometer output |
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: ECUMASTER EMU Black has no battery-constant input; not needed - OEM-2 I: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on ECUMASTER EMU Black - EMUBLACK-Grey 18: Ignition +12V: 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 | ECUMASTER EMU Black — pinout (Black 39-pin / Grey 24-pin) | https://www.ecumaster.com/wp/wp-content/uploads/2020/05/EMU_Black_pinout.pdf | archive | 2026-10-05 | 096b2b4df1bd |
| 4 | vendor_doc | Link G4X MX5X install manual (NA 1.6/1.8) | https://linkecu.com/documentation/MX5X.pdf | archive | 2026-10-05 | b7f730de9f6e |