MX-5 Miata NB1 1999-00 (BP-4W) → ECUMASTER EMU Black (auto)
MX-5 Miata NB1 1999-00 (BP-4W) — 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 | 51 wires · 8 connectors · 3 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 | OEM-3-M | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-14V-1 | EMUBLACK-Black-13 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-3-A | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-3-B | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-3-C | 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-3-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-I | EMUBLACK-Black-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-2-J | EMUBLACK-Black-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-2-H | EMUBLACK-Black-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-2-F | EMUBLACK-Black-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-3-G | EMUBLACK-Grey-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-3-H | EMUBLACK-Grey-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-3-W | EMUBLACK-Grey-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-3-X | EMUBLACK-Grey-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-3-Y | EMUBLACK-Grey-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-3-Z | EMUBLACK-Grey-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-1-I | EMUBLACK-Grey-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-1-R | EMUBLACK-Grey-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-1-S | EMUBLACK-Grey-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-3-N | EMUBLACK-Grey-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-1-U | EMUBLACK-Grey-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-3-V | EMUBLACK-Grey-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-3-O | EMUBLACK-Grey-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-1-E | EMUBLACK-Grey-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-1-O | EMUBLACK-Grey-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-1-Q | EMUBLACK-Grey-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-2-M | EMUBLACK-Grey-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-2-N | EMUBLACK-Grey-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-2-O | EMUBLACK-Grey-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-2-L | EMUBLACK-Black-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-3-E | EMUBLACK-Black-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-2-C | EMUBLACK-Black-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-3-J | EMUBLACK-Black-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-2-E | EMUBLACK-Black-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-2-B | EMUBLACK-Black-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-2-A | EMUBLACK-Black-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-3-K | EMUBLACK-Black-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-3-S | EMUBLACK-Black-35 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-2-D | EMUBLACK-Black-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | OEM-1-F | EMUBLACK-Black-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W49 | OEM-1-G | EMUBLACK-Black-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W50 | OEM-1-P | EMUBLACK-Black-36 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W51 | OEM-1-V | EMUBLACK-Black-37 | 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-26 | EMUBLACK-Black-27 | open (OL) | 5 V sensor reference must not touch power ground | |
| 4 | EMUBLACK-Black-26 | EMUBLACK-Black-29 | open (OL) | 5 V sensor reference must not touch sensor ground | |
| 5 | EMUBLACK-Black-13 | EMUBLACK-Black-26 | open (OL) | +12 V supply 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 | — | W48 | — | 0.5 | OEM-1-F | — | — | — |
| 11 | RS232 TXD | — | — | — | — | — | — | — | — |
| 12 | CAN H | — | — | — | — | — | — | — | — |
| 13 | Battery +12V | — | W3 | — | 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-3-J | — | — | — |
| 18 | TPS In | — | W39 | — | 0.5 | OEM-3-E | — | — | — |
| 19 | WBO Ip | — | — | — | — | — | — | — | — |
| 2 | EGT in #1 | — | — | — | — | — | — | — | — |
| 20 | VSS In | — | W47 | — | 0.5 | OEM-2-D | — | — | — |
| 21 | Camsync In #1 | — | W17 | — | 0.5 | OEM-2-H | — | — | — |
| 22 | WBO Rcal | — | — | — | — | — | — | — | — |
| 23 | Switch #2 In | — | W49 | — | 0.5 | OEM-1-G | — | — | — |
| 24 | RS232 RXD | — | — | — | — | — | — | — | — |
| 25 | CAN L | — | — | — | — | — | — | — | — |
| 26 | +5V supply | — | W15 | — | 0.5 | OEM-2-I | — | — | — |
| 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 | — | W18 | — | 0.5 | OEM-2-F | — | — | — |
| 30 | Analog In #4 | — | W45 | — | 0.5 | OEM-3-K | — | — | — |
| 31 | Analog In #1 | — | W38 | — | 0.5 | OEM-2-L | — | — | — |
| 32 | IAT In | — | W42 | — | 0.5 | OEM-2-E | — | — | — |
| 33 | WBO VGND | — | — | — | — | — | — | — | — |
| 34 | +5V supply | — | — | — | — | — | — | — | — |
| 35 | Analog In #5 | — | W46 | — | 0.5 | OEM-3-S | — | — | — |
| 36 | Switch #3 In | — | W50 | — | 0.5 | OEM-1-P | — | — | — |
| 37 | Analog In #6 | — | W51 | — | 0.5 | OEM-1-V | — | — | — |
| 38 | Sensor Ground | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 39 | Sensor Ground | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 4 | Analog In #2 | — | W40 | — | 0.5 | OEM-2-C | — | — | — |
| 5 | CLT In | — | W43 | — | 0.5 | OEM-2-B | — | — | — |
| 6 | WBO Vs | — | — | — | — | — | — | — | — |
| 7 | Camsync In #2 | — | — | — | — | — | — | — | — |
| 8 | Primary trigger | — | W16 | — | 0.5 | OEM-2-J | — | — | — |
| 9 | Flex Fuel In | — | W44 | — | 0.5 | OEM-2-A | — | — | — |
EMUBLACK-Grey
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Ignition coil #6 | — | — | — | — | — | — | — | — |
| 10 | H-Bridge #1 Winding B | — | W34 | — | 0.5 | OEM-1-Q | — | — | — |
| 11 | H-Bridge #2 Winding B | — | W36 | — | 0.5 | OEM-2-N | — | — | — |
| 12 | AUX 5 | — | W30 | — | 0.5 | OEM-3-V | — | — | — |
| 13 | AUX 2 / Injector #8 | — | W26 | — | 0.5 | OEM-1-R | — | — | — |
| 14 | Injector #5 | — | W32 | — | 0.5 | OEM-1-E | — | — | — |
| 15 | Injector #2 | — | W22 | — | 0.5 | OEM-3-X | — | — | — |
| 16 | Ignition coil #2 | — | W20 | — | 0.5 | OEM-3-H | — | — | — |
| 17 | Power Ground | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| 18 | Ignition +12V | — | — | — | — | — | — | — | — |
| 19 | WBO Heater | — | W29 | — | 0.5 | OEM-1-U | — | — | — |
| 2 | H-Bridge #1 Winding A | — | W35 | — | 0.5 | OEM-2-M | — | — | — |
| 20 | AUX 4 / Tacho | — | W28 | — | 0.5 | OEM-3-N | — | — | — |
| 21 | AUX 1 / Injector #7 | — | W25 | — | 0.5 | OEM-1-I | — | — | — |
| 22 | Injector #6 | — | W33 | — | 0.5 | OEM-1-O | — | — | — |
| 23 | Injector #3 | — | W23 | — | 0.5 | OEM-3-Y | — | — | — |
| 24 | Power Ground | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
| 3 | H-Bridge #2 Winding A | — | W37 | — | 0.5 | OEM-2-O | — | — | — |
| 4 | AUX 6 | — | W31 | — | 0.5 | OEM-3-O | — | — | — |
| 5 | AUX 3 | — | W27 | — | 0.5 | OEM-1-S | — | — | — |
| 6 | Injector #4 | — | W24 | — | 0.5 | OEM-3-Z | — | — | — |
| 7 | Injector #1 | — | W21 | — | 0.5 | OEM-3-W | — | — | — |
| 8 | Ignition coil #1 | — | W19 | — | 0.5 | OEM-3-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 | — | — | — |
| E | Malfunction indicator lamp (MIL) | — | W32 | — | 0.5 | EMUBLACK-Grey-14 | — | — | — |
| F | Brake switch | — | W48 | — | 0.5 | EMUBLACK-Black-10 | — | — | — |
| G | Power steering pressure switch | — | W49 | — | 0.5 | EMUBLACK-Black-23 | — | — | — |
| I | Condenser fan relay | — | W25 | — | 0.5 | EMUBLACK-Grey-21 | — | — | — |
| O | Alternator control | — | W33 | — | 0.5 | EMUBLACK-Grey-22 | — | — | — |
| P | A/C request | — | W50 | — | 0.5 | EMUBLACK-Black-36 | — | — | — |
| Q | Charge lamp | — | W34 | — | 0.5 | EMUBLACK-Grey-10 | — | — | — |
| R | Cooling fan relay | — | W26 | — | 0.5 | EMUBLACK-Grey-13 | — | — | — |
| S | A/C clutch relay | — | W27 | — | 0.5 | EMUBLACK-Grey-5 | — | — | — |
| U | Front O2 heater | — | W29 | — | 0.5 | EMUBLACK-Grey-19 | — | — | — |
| V | Neutral switch | — | W51 | — | 0.5 | EMUBLACK-Black-37 | — | — | — |
OEM-2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Fuel tank pressure | — | W44 | — | 0.5 | EMUBLACK-Black-9 | — | — | — |
| B | Intake air temperature (IAT) | — | W43 | — | 0.5 | EMUBLACK-Black-5 | — | — | — |
| C | Front O2 signal | — | W40 | — | 0.5 | EMUBLACK-Black-4 | — | — | — |
| D | Vehicle speed | — | W47 | — | 0.5 | EMUBLACK-Black-20 | — | — | — |
| E | Coolant temperature (ECT) | — | W42 | — | 0.5 | EMUBLACK-Black-32 | — | — | — |
| F | Knock sensor | — | W18 | — | 0.5 | EMUBLACK-Black-3 | — | — | — |
| H | Cam position (CMP) | — | W17 | — | 0.5 | EMUBLACK-Black-21 | — | — | — |
| I | +5V sensor supply | — | W15 | — | 0.5 | EMUBLACK-Black-26 | — | — | — |
| J | Crank position (CKP) | — | W16 | — | 0.5 | EMUBLACK-Black-8 | — | — | — |
| K | Tachometer output | — | — | — | — | — | — | — | — |
| L | Mass air flow (MAF) | — | W38 | — | 0.5 | EMUBLACK-Black-31 | — | — | — |
| M | EGR valve | — | W35 | — | 0.5 | EMUBLACK-Grey-2 | — | — | — |
| N | EGR valve | — | W36 | — | 0.5 | EMUBLACK-Grey-11 | — | — | — |
| O | EGR valve | — | W37 | — | 0.5 | EMUBLACK-Grey-3 | — | — | — |
| P | EGR valve | — | — | — | — | — | — | — | — |
OEM-3
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Power ground | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| B | Power ground | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| C | Power ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| E | Throttle position (TPS) | — | W39 | — | 0.5 | EMUBLACK-Black-18 | — | — | — |
| F | Signal ground | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| G | Ignition 1 (coils 1+4, wasted spark) | — | W19 | — | 0.5 | EMUBLACK-Grey-8 | — | — | — |
| H | Ignition 2 (coils 2+3, wasted spark) | — | W20 | — | 0.5 | EMUBLACK-Grey-16 | — | — | — |
| I | Clutch switch | — | — | — | — | — | — | — | — |
| J | Rear O2 signal | — | W41 | — | 0.5 | EMUBLACK-Black-17 | — | — | — |
| K | Fuel level | — | W45 | — | 0.5 | EMUBLACK-Black-30 | — | — | — |
| L | Evap purge solenoid | — | — | — | — | — | — | — | — |
| M | ISC valve +14V feed | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| N | Fuel pump relay | — | W28 | — | 0.5 | EMUBLACK-Grey-20 | — | — | — |
| O | ISC valve low side | — | W31 | — | 0.5 | EMUBLACK-Grey-4 | — | — | — |
| Q | VICS solenoid (intake butterflies) | — | — | — | — | — | — | — | — |
| S | EGR boost sensor | — | W46 | — | 0.5 | EMUBLACK-Black-35 | — | — | — |
| T | EGR boost solenoid | — | — | — | — | — | — | — | — |
| U | Canister drain cut valve (CDCV) | — | — | — | — | — | — | — | — |
| V | Rear O2 heater | — | W30 | — | 0.5 | EMUBLACK-Grey-12 | — | — | — |
| W | Injector 1 | — | W21 | — | 0.5 | EMUBLACK-Grey-7 | — | — | — |
| X | Injector 2 | — | W22 | — | 0.5 | EMUBLACK-Grey-15 | — | — | — |
| Y | Injector 3 | — | W23 | — | 0.5 | EMUBLACK-Grey-23 | — | — | — |
| Z | Injector 4 | — | W24 | — | 0.5 | EMUBLACK-Grey-6 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W11 | — | 0.5 | OEM-3-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 | OEM-3-M | — | — | — |
| 1 | — | — | W3 | — | 0.85 | EMUBLACK-Black-13 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W4 | — | 0.85 | OEM-3-A | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-3-B | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-3-C | — | — | — |
| 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-E | Malfunction indicator lamp (MIL) | low_side_out | EMUBLACK-Grey-14 | Injector #5 | injector_out | single_source | |
| OEM-1-F | Brake switch | digital_in | EMUBLACK-Black-10 | Switch #1 In | digital_in | single_source | |
| OEM-1-G | Power steering pressure switch | digital_in | EMUBLACK-Black-23 | Switch #2 In | digital_in | single_source | |
| OEM-1-I | Condenser fan relay | low_side_out | EMUBLACK-Grey-21 | AUX 1 / Injector #7 | low_side_out | single_source | |
| OEM-1-O | Alternator control | low_side_out | EMUBLACK-Grey-22 | Injector #6 | injector_out | single_source | |
| OEM-1-P | A/C request | digital_in | EMUBLACK-Black-36 | Switch #3 In | digital_in | single_source | |
| OEM-1-Q | Charge lamp | low_side_out | EMUBLACK-Grey-10 | H-Bridge #1 Winding B | hbridge_out | 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-S | A/C clutch relay | low_side_out | EMUBLACK-Grey-5 | AUX 3 | low_side_out | single_source | |
| OEM-1-U | Front O2 heater | low_side_out | EMUBLACK-Grey-19 | WBO Heater | low_side_out | single_source | |
| OEM-1-V | Neutral switch | digital_in | EMUBLACK-Black-37 | Analog In #6 | analog_in | single_source | |
| OEM-2-A | Fuel tank pressure | analog_in | EMUBLACK-Black-9 | Flex Fuel In | analog_in | single_source | |
| OEM-2-B | Intake air temperature (IAT) | temp_in | EMUBLACK-Black-5 | CLT In | temp_in | single_source | |
| OEM-2-C | Front O2 signal | lambda_nb_in | EMUBLACK-Black-4 | Analog In #2 | analog_in | single_source | |
| OEM-2-D | Vehicle speed | digital_in | EMUBLACK-Black-20 | VSS In | digital_in | single_source | |
| OEM-2-E | Coolant temperature (ECT) | temp_in | EMUBLACK-Black-32 | IAT In | temp_in | single_source | |
| OEM-2-F | Knock sensor | knock_in | EMUBLACK-Black-3 | Knock Sensor in #1 | knock_in | single_source | |
| OEM-2-H | Cam position (CMP) | trigger_in | EMUBLACK-Black-21 | Camsync In #1 | trigger_in | single_source | |
| OEM-2-I | +5V sensor supply | vref | EMUBLACK-Black-26 | +5V supply | vref | single_source | |
| OEM-2-J | Crank position (CKP) | trigger_in | EMUBLACK-Black-8 | Primary trigger | trigger_in | single_source | |
| OEM-2-K | Tachometer output | tacho_out | — | — | — | single_source | |
| OEM-2-L | Mass air flow (MAF) | analog_in | EMUBLACK-Black-31 | Analog In #1 | analog_in | single_source | |
| OEM-2-M | EGR valve | low_side_out | EMUBLACK-Grey-2 | H-Bridge #1 Winding A | hbridge_out | single_source | |
| OEM-2-N | EGR valve | low_side_out | EMUBLACK-Grey-11 | H-Bridge #2 Winding B | hbridge_out | single_source | |
| OEM-2-O | EGR valve | low_side_out | EMUBLACK-Grey-3 | H-Bridge #2 Winding A | hbridge_out | single_source | |
| OEM-2-P | EGR valve | low_side_out | — | — | — | single_source | |
| OEM-3-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-3-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-3-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-3-E | Throttle position (TPS) | analog_in | EMUBLACK-Black-18 | TPS In | analog_in | single_source | |
| OEM-3-F | Signal ground | sensor_ground | EMUBLACK-Black-29 + EMUBLACK-Black-38 + EMUBLACK-Black-39 | Sensor Ground + Sensor Ground + Sensor Ground | sensor_ground | single_source | |
| OEM-3-G | Ignition 1 (coils 1+4, wasted spark) | ignition_out | EMUBLACK-Grey-8 | Ignition coil #1 | ignition_out | single_source | |
| OEM-3-H | Ignition 2 (coils 2+3, wasted spark) | ignition_out | EMUBLACK-Grey-16 | Ignition coil #2 | ignition_out | single_source | |
| OEM-3-I | Clutch switch | digital_in | — | — | — | single_source | |
| OEM-3-J | Rear O2 signal | lambda_nb_in | EMUBLACK-Black-17 | Analog In #3 | analog_in | single_source | |
| OEM-3-K | Fuel level | analog_in | EMUBLACK-Black-30 | Analog In #4 | analog_in | single_source | |
| OEM-3-L | Evap purge solenoid | low_side_out | — | — | — | single_source | |
| OEM-3-M | ISC valve +14V feed | power_in | EMUBLACK-Black-13 | Battery +12V | power_in | single_source | |
| OEM-3-N | Fuel pump relay | low_side_out | EMUBLACK-Grey-20 | AUX 4 / Tacho | low_side_out | single_source | |
| OEM-3-O | ISC valve low side | low_side_out | EMUBLACK-Grey-4 | AUX 6 | low_side_out | single_source | |
| OEM-3-Q | VICS solenoid (intake butterflies) | low_side_out | — | — | — | single_source | |
| OEM-3-S | EGR boost sensor | analog_in | EMUBLACK-Black-35 | Analog In #5 | analog_in | single_source | |
| OEM-3-T | EGR boost solenoid | low_side_out | — | — | — | single_source | |
| OEM-3-U | Canister drain cut valve (CDCV) | low_side_out | — | — | — | single_source | |
| OEM-3-V | Rear O2 heater | low_side_out | EMUBLACK-Grey-12 | AUX 5 | low_side_out | single_source | |
| OEM-3-W | Injector 1 | injector_out | EMUBLACK-Grey-7 | Injector #1 | injector_out | single_source | |
| OEM-3-X | Injector 2 | injector_out | EMUBLACK-Grey-15 | Injector #2 | injector_out | single_source | |
| OEM-3-Y | Injector 3 | injector_out | EMUBLACK-Grey-23 | Injector #3 | injector_out | single_source | |
| OEM-3-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 | OEM-3-M | SP-14V-1 | 0.85 | no route | ISC valve +14V feed | — | |
| W3 | SP-14V-1 | EMUBLACK-Black-13 | 0.85 | no route | Battery +12V | — | |
| W4 | OEM-3-A | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W5 | OEM-3-B | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W6 | OEM-3-C | 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-3-F | SP-0V-1 | 0.5 | no route | Signal 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-I | EMUBLACK-Black-26 | 0.5 | no route | +5V sensor supply | — | |
| W16 | OEM-2-J | EMUBLACK-Black-8 | 0.5 | no route | Crank position (CKP) | — | |
| W17 | OEM-2-H | EMUBLACK-Black-21 | 0.5 | no route | Cam position (CMP) | — | |
| W18 | OEM-2-F | EMUBLACK-Black-3 | 0.5 | no route | Knock sensor | — | |
| W19 | OEM-3-G | EMUBLACK-Grey-8 | 0.5 | no route | Ignition 1 (coils 1+4, wasted spark) | — | |
| W20 | OEM-3-H | EMUBLACK-Grey-16 | 0.5 | no route | Ignition 2 (coils 2+3, wasted spark) | — | |
| W21 | OEM-3-W | EMUBLACK-Grey-7 | 0.5 | no route | Injector 1 | — | |
| W22 | OEM-3-X | EMUBLACK-Grey-15 | 0.5 | no route | Injector 2 | — | |
| W23 | OEM-3-Y | EMUBLACK-Grey-23 | 0.5 | no route | Injector 3 | — | |
| W24 | OEM-3-Z | EMUBLACK-Grey-6 | 0.5 | no route | Injector 4 | — | |
| W25 | OEM-1-I | EMUBLACK-Grey-21 | 0.5 | no route | Condenser fan relay | — | |
| W26 | OEM-1-R | EMUBLACK-Grey-13 | 0.5 | no route | Cooling fan relay | — | |
| W27 | OEM-1-S | EMUBLACK-Grey-5 | 0.5 | no route | A/C clutch relay | — | |
| W28 | OEM-3-N | EMUBLACK-Grey-20 | 0.5 | no route | Fuel pump relay | — | |
| W29 | OEM-1-U | EMUBLACK-Grey-19 | 0.5 | no route | Front O2 heater | — | |
| W30 | OEM-3-V | EMUBLACK-Grey-12 | 0.5 | no route | Rear O2 heater | — | |
| W31 | OEM-3-O | EMUBLACK-Grey-4 | 0.5 | no route | ISC valve low side | — | |
| W32 | OEM-1-E | EMUBLACK-Grey-14 | 0.5 | no route | Malfunction indicator lamp (MIL) | — | |
| W33 | OEM-1-O | EMUBLACK-Grey-22 | 0.5 | no route | Alternator control | — | |
| W34 | OEM-1-Q | EMUBLACK-Grey-10 | 0.5 | no route | Charge lamp | — | |
| W35 | OEM-2-M | EMUBLACK-Grey-2 | 0.5 | no route | EGR valve | — | |
| W36 | OEM-2-N | EMUBLACK-Grey-11 | 0.5 | no route | EGR valve | — | |
| W37 | OEM-2-O | EMUBLACK-Grey-3 | 0.5 | no route | EGR valve | — | |
| W38 | OEM-2-L | EMUBLACK-Black-31 | 0.5 | no route | Mass air flow (MAF) | — | |
| W39 | OEM-3-E | EMUBLACK-Black-18 | 0.5 | no route | Throttle position (TPS) | — | |
| W40 | OEM-2-C | EMUBLACK-Black-4 | 0.5 | no route | Front O2 signal | — | |
| W41 | OEM-3-J | EMUBLACK-Black-17 | 0.5 | no route | Rear O2 signal | — | |
| W42 | OEM-2-E | EMUBLACK-Black-32 | 0.5 | no route | Coolant temperature (ECT) | — | |
| W43 | OEM-2-B | EMUBLACK-Black-5 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W44 | OEM-2-A | EMUBLACK-Black-9 | 0.5 | no route | Fuel tank pressure | — | |
| W45 | OEM-3-K | EMUBLACK-Black-30 | 0.5 | no route | Fuel level | — | |
| W46 | OEM-3-S | EMUBLACK-Black-35 | 0.5 | no route | EGR boost sensor | — | |
| W47 | OEM-2-D | EMUBLACK-Black-20 | 0.5 | no route | Vehicle speed | — | |
| W48 | OEM-1-F | EMUBLACK-Black-10 | 0.5 | no route | Brake switch | — | |
| W49 | OEM-1-G | EMUBLACK-Black-23 | 0.5 | no route | Power steering pressure switch | — | |
| W50 | OEM-1-P | EMUBLACK-Black-36 | 0.5 | no route | A/C request | — | |
| W51 | OEM-1-V | EMUBLACK-Black-37 | 0.5 | no route | Neutral switch | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|---|---|---|---|---|
| connector | 174514-6 | TE | AMP Multilock .040/.070 hybrid 16-pin female harness plug (Miata NB1 ECU) | 1.000 | ea |
| 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 (8)
| Severity | Code | Subject | Message |
|---|---|---|---|
| warn | NET_FAMILY | OEM-1-Q ↔ EMUBLACK-Grey-10 | OEM-1-Q "Charge lamp" [low_side_out] is wired to EMUBLACK-Grey-10 "H-Bridge #1 Winding B" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way. |
| warn | NET_FAMILY | OEM-1-V ↔ EMUBLACK-Black-37 | OEM-1-V "Neutral switch" [digital_in] is wired to EMUBLACK-Black-37 "Analog In #6" [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. |
| warn | NET_FAMILY | OEM-2-M ↔ EMUBLACK-Grey-2 | OEM-2-M "EGR valve" [low_side_out] is wired to EMUBLACK-Grey-2 "H-Bridge #1 Winding A" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way. |
| warn | NET_FAMILY | OEM-2-N ↔ EMUBLACK-Grey-11 | OEM-2-N "EGR valve" [low_side_out] is wired to EMUBLACK-Grey-11 "H-Bridge #2 Winding B" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way. |
| warn | NET_FAMILY | OEM-2-O ↔ EMUBLACK-Grey-3 | OEM-2-O "EGR valve" [low_side_out] is wired to EMUBLACK-Grey-3 "H-Bridge #2 Winding A" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way. |
| info | NET_FAMILY | OEM-1-E ↔ EMUBLACK-Grey-14 | OEM-1-E "Malfunction indicator lamp (MIL)" [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-1-O ↔ EMUBLACK-Grey-22 | OEM-1-O "Alternator control" [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 | 7 optional OEM pins are not mapped: OEM-2-K Tachometer output; OEM-2-P EGR valve; OEM-3-I Clutch switch; OEM-3-L Evap purge solenoid; OEM-3-Q VICS solenoid (intake butterflies); OEM-3-T EGR boost solenoid; OEM-3-U Canister drain cut valve (CDCV) |
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 P: EGR valve: no free low_side/ls_hs/injector/hbridge on ECUMASTER EMU Black - OEM-3 L: Evap purge solenoid: no free low_side/ls_hs/injector/hbridge on ECUMASTER EMU Black - OEM-3 Q: VICS solenoid (intake butterflies): no free low_side/ls_hs/injector/hbridge on ECUMASTER EMU Black - OEM-3 T: EGR boost solenoid: no free low_side/ls_hs/injector/hbridge on ECUMASTER EMU Black - OEM-3 U: Canister drain cut valve (CDCV): no free low_side/ls_hs/injector/hbridge on ECUMASTER EMU Black - OEM-2 K: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on ECUMASTER EMU Black - OEM-3 I: Clutch switch: no free switch_in/frequency_in/analog_0_5 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 MX5NB1X install manual (NB1 1999-00) | https://linkecu.com/documentation/MX5XNB1.pdf | archive | 2026-10-05 | 2e36c91270cc |