MX-5 Miata NA8 1994-97 (BP-ZE, 1.8) → ECUMASTER EMU PRO 16 (auto)
MX-5 Miata NA8 1994-97 (BP-ZE, 1.8) — ECUMASTER — EMU PRO 16
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 2026-10-08
Before you start
| Status | draft · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | 1: read the Findings page before cutting any wire |
| Size of the job | 45 wires · 9 connectors · 7 part lines |
| Tools | Crimp and extraction tools for each terminal family (see Connectors) · wire strippers · multimeter · heat gun + heat-shrink |
| Terminals | 3-1447221-4 |
| 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 | EMUPRO16-B-14 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-14V-1 | EMUPRO16-B-8 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-2-A | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-2-B | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-2-C | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-2-D | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | EMUPRO16-A-11 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | EMUPRO16-A-17 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-GND-1 | EMUPRO16-A-19 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-GND-1 | EMUPRO16-B-19 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | SP-GND-1 | EMUPRO16-C-30 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | SP-GND-1 | EMUPRO16-D-18 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-2-F | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | SP-0V-1 | EMUPRO16-A-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | SP-0V-1 | EMUPRO16-B-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | SP-0V-1 | EMUPRO16-C-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | SP-0V-1 | EMUPRO16-D-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-2-K | EMUPRO16-A-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-2-E | EMUPRO16-A-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-1-G | EMUPRO16-A-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-1-H | EMUPRO16-A-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-2-U | EMUPRO16-A-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-2-V | EMUPRO16-A-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-2-Y | EMUPRO16-A-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-2-Z | EMUPRO16-A-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-1-J | EMUPRO16-B-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-1-R | EMUPRO16-B-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-2-S | EMUPRO16-B-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-2-T | EMUPRO16-B-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-2-W | EMUPRO16-B-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-1-E | EMUPRO16-B-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-2-R | EMUPRO16-B-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-2-X | EMUPRO16-B-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-2-I | EMUPRO16-A-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-2-O | EMUPRO16-C-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-2-M | EMUPRO16-C-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-2-N | EMUPRO16-C-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-2-Q | EMUPRO16-C-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-2-P | EMUPRO16-C-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-1-M | EMUPRO16-A-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-1-C | EMUPRO16-A-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-1-P | EMUPRO16-A-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-1-Q | EMUPRO16-A-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-1-V | EMUPRO16-A-16 | 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 | EMUPRO16-B-14 | EMUPRO16-A-11 | open (OL) | +12 V supply must not touch power ground | |
| 2 | EMUPRO16-B-14 | EMUPRO16-A-20 | open (OL) | +12 V supply must not touch sensor ground | |
| 3 | EMUPRO16-A-11 | EMUPRO16-A-12 | open (OL) | power ground must not touch 5 V sensor reference | |
| 4 | EMUPRO16-A-20 | EMUPRO16-A-12 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 5 | EMUPRO16-B-14 | EMUPRO16-A-12 | open (OL) | +12 V supply must not touch 5 V sensor reference |
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
EMUPRO16-A
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Ignition 8 | — | — | — | — | — | — | — | — |
| 2 | Injector 1 | — | W23 | — | 0.5 | OEM-2-U | — | — | — |
| 3 | Injector 2 | — | W24 | — | 0.5 | OEM-2-V | — | — | — |
| 4 | Injector 3 | — | W25 | — | 0.5 | OEM-2-Y | — | — | — |
| 5 | Injector 4 | — | W26 | — | 0.5 | OEM-2-Z | — | — | — |
| 6 | Injector 5 | — | — | — | — | — | — | — | — |
| 7 | Injector 6 | — | — | — | — | — | — | — | — |
| 8 | Injector 7 | — | — | — | — | — | — | — | — |
| 9 | Injector 8 | — | — | — | — | — | — | — | — |
| 10 | Ignition 7 | — | — | — | — | — | — | — | — |
| 11 | Power GND | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 12 | +5V source A | — | W19 | — | 0.5 | OEM-2-K | — | — | — |
| 13 | Digital 2 | — | W41 | — | 0.5 | OEM-1-M | — | — | — |
| 14 | Digital 4 | — | W43 | — | 0.5 | OEM-1-P | — | — | — |
| 15 | Digital 8 | — | — | — | — | — | — | — | — |
| 16 | Digital 6 (turbo) | — | W45 | — | 0.5 | OEM-1-V | — | — | — |
| 17 | Power GND | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| 18 | Ignition 6 | — | — | — | — | — | — | — | — |
| 19 | Power GND | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
| 20 | Digital GND | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 21 | Digital 1 (crank) | — | W20 | — | 0.5 | OEM-2-E | — | — | — |
| 22 | Digital 3 | — | W42 | — | 0.5 | OEM-1-C | — | — | — |
| 23 | Digital 7 | — | — | — | — | — | — | — | — |
| 24 | Digital 5 (turbo) | — | W44 | — | 0.5 | OEM-1-Q | — | — | — |
| 25 | Auxiliary 9 | — | W35 | — | 0.5 | OEM-2-I | — | — | — |
| 26 | Ignition 5 | — | — | — | — | — | — | — | — |
| 27 | Ignition 4 | — | — | — | — | — | — | — | — |
| 28 | Ignition 3 | — | — | — | — | — | — | — | — |
| 29 | Ignition 2 | — | W22 | — | 0.5 | OEM-1-H | — | — | — |
| 30 | Ignition 1 | — | W21 | — | 0.5 | OEM-1-G | — | — | — |
| 31 | CAN 1 high (PC comm) | — | — | — | — | — | — | — | — |
| 32 | CAN 1 low (PC comm) | — | — | — | — | — | — | — | — |
| 33 | CAN 2 high | — | — | — | — | — | — | — | — |
| 34 | CAN 2 low | — | — | — | — | — | — | — | — |
EMUPRO16-B
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Auxiliary 1 (WBO heater) | — | W27 | — | 0.5 | OEM-1-J | — | — | — |
| 2 | Auxiliary 2 (WBO heater) | — | W28 | — | 0.5 | OEM-1-R | — | — | — |
| 3 | Auxiliary 3 (WBO heater) | — | W29 | — | 0.5 | OEM-2-S | — | — | — |
| 4 | Auxiliary 4 (WBO heater) | — | W30 | — | 0.5 | OEM-2-T | — | — | — |
| 5 | Auxiliary 5 | — | W31 | — | 0.5 | OEM-2-W | — | — | — |
| 6 | Auxiliary 6 | — | W32 | — | 0.5 | OEM-1-E | — | — | — |
| 7 | Auxiliary 7 | — | W33 | — | 0.5 | OEM-2-R | — | — | — |
| 8 | +12V supply | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 9 | Digital GND (flash drive) | — | W16 | — | 0.5 | SP-0V-1 | — | — | — |
| 10 | USB D- (flash drive) | — | — | — | — | — | — | — | — |
| 11 | USB D+ (flash drive) | — | — | — | — | — | — | — | — |
| 12 | +5V source A (flash drive) | — | — | — | — | — | — | — | — |
| 13 | Auxiliary 8 | — | W34 | — | 0.5 | OEM-2-X | — | — | — |
| 14 | +12V supply | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 15 | +12V switched | — | — | — | — | — | — | — | — |
| 16 | Knock sensor 1 | — | — | — | — | — | — | — | — |
| 17 | Knock sensor 2 | — | — | — | — | — | — | — | — |
| 18 | WBO 2 VGND (LSU 4.9) | — | — | — | — | — | — | — | — |
| 19 | Power GND | — | W11 | — | 0.85 | SP-GND-1 | — | — | — |
| 20 | WBO 1 IP (LSU 4.9) | — | — | — | — | — | — | — | — |
| 21 | WBO 1 VS (LSU 4.9) | — | — | — | — | — | — | — | — |
| 22 | WBO 1 RCAL (LSU 4.9) | — | — | — | — | — | — | — | — |
| 23 | WBO 1 VGND (LSU 4.9) | — | — | — | — | — | — | — | — |
| 24 | WBO 2 IP (LSU 4.9) | — | — | — | — | — | — | — | — |
| 25 | WBO 2 VS (LSU 4.9) | — | — | — | — | — | — | — | — |
| 26 | WBO 2 RCAL (LSU 4.9) | — | — | — | — | — | — | — | — |
EMUPRO16-C
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Auxiliary 10 | — | — | — | — | — | — | — | — |
| 2 | Auxiliary 11 | — | — | — | — | — | — | — | — |
| 3 | Auxiliary 12 | — | — | — | — | — | — | — | — |
| 4 | Analog 7 | — | — | — | — | — | — | — | — |
| 5 | Analog 10 (2k2 pull) | — | — | — | — | — | — | — | — |
| 6 | H-bridge 1A | — | — | — | — | — | — | — | — |
| 7 | H-bridge 2B | — | — | — | — | — | — | — | — |
| 8 | H-bridge 3A | — | — | — | — | — | — | — | — |
| 9 | H-bridge 2A | — | — | — | — | — | — | — | — |
| 10 | Analog 1 (MAP) | — | — | — | — | — | — | — | — |
| 11 | Analog 3 | — | W39 | — | 0.5 | OEM-2-Q | — | — | — |
| 12 | Analog 5 | — | — | — | — | — | — | — | — |
| 13 | Analog 8 | — | — | — | — | — | — | — | — |
| 14 | Analog 11 (2k2 pull) | — | — | — | — | — | — | — | — |
| 15 | Analog 13 (1k pull) | — | — | — | — | — | — | — | — |
| 16 | Analog 15 (330R pull) | — | — | — | — | — | — | — | — |
| 17 | H-bridge 3B | — | — | — | — | — | — | — | — |
| 18 | Analog 2 | — | W37 | — | 0.5 | OEM-2-M | — | — | — |
| 19 | Analog 4 | — | — | — | — | — | — | — | — |
| 20 | Analog 6 | — | — | — | — | — | — | — | — |
| 21 | Analog 9 (2k2 pull) | — | — | — | — | — | — | — | — |
| 22 | Analog 12 (2k2 pull) | — | — | — | — | — | — | — | — |
| 23 | Analog 14 (1k pull) | — | — | — | — | — | — | — | — |
| 24 | Analog 16 (100R pull) | — | — | — | — | — | — | — | — |
| 25 | H-bridge 1B | — | — | — | — | — | — | — | — |
| 26 | LIN | — | — | — | — | — | — | — | — |
| 27 | +5V source B | — | — | — | — | — | — | — | — |
| 28 | +5V source B | — | — | — | — | — | — | — | — |
| 29 | Analog GND | — | W17 | — | 0.5 | SP-0V-1 | — | — | — |
| 30 | Power GND | — | W12 | — | 0.85 | SP-GND-1 | — | — | — |
| 31 | Precision analog 1 | — | W36 | — | 0.5 | OEM-2-O | — | — | — |
| 32 | Precision analog 2 | — | W38 | — | 0.5 | OEM-2-N | — | — | — |
| 33 | Precision analog 3 | — | W40 | — | 0.5 | OEM-2-P | — | — | — |
| 34 | Precision analog 4 | — | — | — | — | — | — | — | — |
EMUPRO16-D
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injector 10 | — | — | — | — | — | — | — | — |
| 2 | Injector 11 | — | — | — | — | — | — | — | — |
| 3 | Injector 12 | — | — | — | — | — | — | — | — |
| 4 | Injector 13 | — | — | — | — | — | — | — | — |
| 5 | Injector 14 | — | — | — | — | — | — | — | — |
| 6 | Injector 15 | — | — | — | — | — | — | — | — |
| 7 | Injector 16 | — | — | — | — | — | — | — | — |
| 8 | Injector 9 | — | — | — | — | — | — | — | — |
| 9 | Analog 17 | — | — | — | — | — | — | — | — |
| 10 | Analog 18 | — | — | — | — | — | — | — | — |
| 11 | Digital 9 / Analog 19 | — | — | — | — | — | — | — | — |
| 12 | Digital 10 / Analog 20 | — | — | — | — | — | — | — | — |
| 13 | Auxiliary 13 | — | — | — | — | — | — | — | — |
| 14 | H-bridge 4A | — | — | — | — | — | — | — | — |
| 15 | Precision analog 6 | — | — | — | — | — | — | — | — |
| 16 | Precision analog 8 | — | — | — | — | — | — | — | — |
| 17 | Analog GND | — | W18 | — | 0.5 | SP-0V-1 | — | — | — |
| 18 | Power GND | — | W13 | — | 0.85 | SP-GND-1 | — | — | — |
| 19 | Auxiliary 14 | — | — | — | — | — | — | — | — |
| 20 | H-bridge 4B | — | — | — | — | — | — | — | — |
| 21 | Precision analog 5 | — | — | — | — | — | — | — | — |
| 22 | Precision analog 7 | — | — | — | — | — | — | — | — |
| 23 | Ignition 9 | — | — | — | — | — | — | — | — |
| 24 | Ignition 10 | — | — | — | — | — | — | — | — |
| 25 | Auxiliary 16 | — | — | — | — | — | — | — | — |
| 26 | Auxiliary 15 | — | — | — | — | — | — | — | — |
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 | — | W42 | — | 0.5 | EMUPRO16-A-22 | — | — | — |
| E | Malfunction indicator lamp (MIL) | — | W32 | — | 0.5 | EMUPRO16-B-6 | — | — | — |
| G | Ignition 1 (coils 1+4, wasted spark) | — | W21 | — | 0.5 | EMUPRO16-A-30 | — | — | — |
| H | Ignition 2 (coils 2+3, wasted spark) | — | W22 | — | 0.5 | EMUPRO16-A-29 | — | — | — |
| J | A/C relay | — | W27 | — | 0.5 | EMUPRO16-B-1 | — | — | — |
| M | Vehicle speed | — | W41 | — | 0.5 | EMUPRO16-A-13 | — | — | — |
| P | Power steering pressure switch | — | W43 | — | 0.5 | EMUPRO16-A-14 | — | — | — |
| Q | A/C request | — | W44 | — | 0.5 | EMUPRO16-A-24 | — | — | — |
| R | Cooling fan relay | — | W28 | — | 0.5 | EMUPRO16-B-2 | — | — | — |
| V | Neutral/clutch switch | — | W45 | — | 0.5 | EMUPRO16-A-16 | — | — | — |
OEM-2
| 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 | — | — | — |
| D | Power ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| E | Crank position (CAS NE) | — | W20 | — | 0.5 | EMUPRO16-A-21 | — | — | — |
| F | MAF ground | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| G | Cam position (CAS G) | — | — | — | — | — | — | — | — |
| I | Tachometer output | — | W35 | — | 0.5 | EMUPRO16-A-25 | — | — | — |
| K | +5V sensor supply | — | W19 | — | 0.5 | EMUPRO16-A-12 | — | — | — |
| M | Throttle position (TPS) | — | W37 | — | 0.5 | EMUPRO16-C-18 | — | — | — |
| N | O2 sensor | — | W38 | — | 0.5 | EMUPRO16-C-32 | — | — | — |
| O | Mass air flow (MAF) | — | W36 | — | 0.5 | EMUPRO16-C-31 | — | — | — |
| P | Intake air temperature (IAT) | — | W40 | — | 0.5 | EMUPRO16-C-33 | — | — | — |
| Q | Coolant temperature (ECT) | — | W39 | — | 0.5 | EMUPRO16-C-11 | — | — | — |
| R | PRC solenoid (fuel pressure regulator) | — | W33 | — | 0.5 | EMUPRO16-B-7 | — | — | — |
| S | Condenser fan relay | — | W29 | — | 0.5 | EMUPRO16-B-3 | — | — | — |
| T | Fuel pump relay | — | W30 | — | 0.5 | EMUPRO16-B-4 | — | — | — |
| U | Injector 1 | — | W23 | — | 0.5 | EMUPRO16-A-2 | — | — | — |
| V | Injector 2 | — | W24 | — | 0.5 | EMUPRO16-A-3 | — | — | — |
| W | ISC solenoid | — | W31 | — | 0.5 | EMUPRO16-B-5 | — | — | — |
| X | Evap purge solenoid | — | W34 | — | 0.5 | EMUPRO16-B-13 | — | — | — |
| Y | Injector 3 | — | W25 | — | 0.5 | EMUPRO16-A-4 | — | — | — |
| Z | Injector 4 | — | W26 | — | 0.5 | EMUPRO16-A-5 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W14 | — | 0.5 | OEM-2-F | — | — | — |
| 1 | — | — | W15 | — | 0.5 | EMUPRO16-A-20 | — | — | — |
| 1 | — | — | W16 | — | 0.5 | EMUPRO16-B-9 | — | — | — |
| 1 | — | — | W17 | — | 0.5 | EMUPRO16-C-29 | — | — | — |
| 1 | — | — | W18 | — | 0.5 | EMUPRO16-D-17 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-1-B | — | — | — |
| 1 | — | — | W2 | — | 0.85 | EMUPRO16-B-14 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | EMUPRO16-B-8 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W4 | — | 0.85 | OEM-2-A | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-2-B | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-2-C | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-2-D | — | — | — |
| 1 | — | — | W8 | — | 0.85 | EMUPRO16-A-11 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | EMUPRO16-A-17 | — | — | — |
| 1 | — | — | W10 | — | 0.85 | EMUPRO16-A-19 | — | — | — |
| 1 | — | — | W11 | — | 0.85 | EMUPRO16-B-19 | — | — | — |
| 1 | — | — | W12 | — | 0.85 | EMUPRO16-C-30 | — | — | — |
| 1 | — | — | W13 | — | 0.85 | EMUPRO16-D-18 | — | — | — |
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 | EMUPRO16-B-14 + EMUPRO16-B-8 | +12V supply + +12V supply | power_in | single_source | |
| OEM-1-C | Start signal | digital_in | EMUPRO16-A-22 | Digital 3 | digital_in | single_source | |
| OEM-1-E | Malfunction indicator lamp (MIL) | low_side_out | EMUPRO16-B-6 | Auxiliary 6 | low_side_out | single_source | |
| OEM-1-G | Ignition 1 (coils 1+4, wasted spark) | ignition_out | EMUPRO16-A-30 | Ignition 1 | ignition_out | single_source | |
| OEM-1-H | Ignition 2 (coils 2+3, wasted spark) | ignition_out | EMUPRO16-A-29 | Ignition 2 | ignition_out | single_source | |
| OEM-1-J | A/C relay | low_side_out | EMUPRO16-B-1 | Auxiliary 1 (WBO heater) | low_side_out | single_source | |
| OEM-1-M | Vehicle speed | digital_in | EMUPRO16-A-13 | Digital 2 | digital_in | single_source | |
| OEM-1-P | Power steering pressure switch | digital_in | EMUPRO16-A-14 | Digital 4 | digital_in | single_source | |
| OEM-1-Q | A/C request | digital_in | EMUPRO16-A-24 | Digital 5 (turbo) | digital_in | single_source | |
| OEM-1-R | Cooling fan relay | low_side_out | EMUPRO16-B-2 | Auxiliary 2 (WBO heater) | low_side_out | single_source | |
| OEM-1-V | Neutral/clutch switch | digital_in | EMUPRO16-A-16 | Digital 6 (turbo) | digital_in | single_source | |
| OEM-2-A | Power ground | ground | EMUPRO16-A-11 + EMUPRO16-A-17 + EMUPRO16-A-19 + EMUPRO16-B-19 + EMUPRO16-C-30 + EMUPRO16-D-18 | Power GND + Power GND + Power GND + Power GND + Power GND + Power GND | ground | single_source | |
| OEM-2-B | Power ground | ground | EMUPRO16-A-11 + EMUPRO16-A-17 + EMUPRO16-A-19 + EMUPRO16-B-19 + EMUPRO16-C-30 + EMUPRO16-D-18 | Power GND + Power GND + Power GND + Power GND + Power GND + Power GND | ground | single_source | |
| OEM-2-C | Power ground | ground | EMUPRO16-A-11 + EMUPRO16-A-17 + EMUPRO16-A-19 + EMUPRO16-B-19 + EMUPRO16-C-30 + EMUPRO16-D-18 | Power GND + Power GND + Power GND + Power GND + Power GND + Power GND | ground | single_source | |
| OEM-2-D | Power ground | ground | EMUPRO16-A-11 + EMUPRO16-A-17 + EMUPRO16-A-19 + EMUPRO16-B-19 + EMUPRO16-C-30 + EMUPRO16-D-18 | Power GND + Power GND + Power GND + Power GND + Power GND + Power GND | ground | single_source | |
| OEM-2-E | Crank position (CAS NE) | trigger_in | EMUPRO16-A-21 | Digital 1 (crank) | trigger_in | single_source | |
| OEM-2-F | MAF ground | sensor_ground | EMUPRO16-A-20 + EMUPRO16-B-9 + EMUPRO16-C-29 + EMUPRO16-D-17 | Digital GND + Digital GND (flash drive) + Analog GND + Analog GND | sensor_ground | single_source | |
| OEM-2-G | Cam position (CAS G) | trigger_in | — | — | — | single_source | |
| OEM-2-I | Tachometer output | tacho_out | EMUPRO16-A-25 | Auxiliary 9 | low_side_out | single_source | |
| OEM-2-K | +5V sensor supply | vref | EMUPRO16-A-12 | +5V source A | vref | single_source | |
| OEM-2-M | Throttle position (TPS) | analog_in | EMUPRO16-C-18 | Analog 2 | analog_in | single_source | |
| OEM-2-N | O2 sensor | lambda_nb_in | EMUPRO16-C-32 | Precision analog 2 | analog_in | single_source | |
| OEM-2-O | Mass air flow (MAF) | analog_in | EMUPRO16-C-31 | Precision analog 1 | analog_in | single_source | |
| OEM-2-P | Intake air temperature (IAT) | temp_in | EMUPRO16-C-33 | Precision analog 3 | analog_in | single_source | |
| OEM-2-Q | Coolant temperature (ECT) | temp_in | EMUPRO16-C-11 | Analog 3 | analog_in | single_source | |
| OEM-2-R | PRC solenoid (fuel pressure regulator) | low_side_out | EMUPRO16-B-7 | Auxiliary 7 | low_side_out | single_source | |
| OEM-2-S | Condenser fan relay | low_side_out | EMUPRO16-B-3 | Auxiliary 3 (WBO heater) | low_side_out | single_source | |
| OEM-2-T | Fuel pump relay | low_side_out | EMUPRO16-B-4 | Auxiliary 4 (WBO heater) | low_side_out | single_source | |
| OEM-2-U | Injector 1 | injector_out | EMUPRO16-A-2 | Injector 1 | injector_out | single_source | |
| OEM-2-V | Injector 2 | injector_out | EMUPRO16-A-3 | Injector 2 | injector_out | single_source | |
| OEM-2-W | ISC solenoid | low_side_out | EMUPRO16-B-5 | Auxiliary 5 | low_side_out | single_source | |
| OEM-2-X | Evap purge solenoid | low_side_out | EMUPRO16-B-13 | Auxiliary 8 | low_side_out | single_source | |
| OEM-2-Y | Injector 3 | injector_out | EMUPRO16-A-4 | Injector 3 | injector_out | single_source | |
| OEM-2-Z | Injector 4 | injector_out | EMUPRO16-A-5 | 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 | EMUPRO16-B-14 | 0.85 | no route | +12V supply | — | |
| W3 | SP-14V-1 | EMUPRO16-B-8 | 0.85 | no route | +12V supply | — | |
| W4 | OEM-2-A | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W5 | OEM-2-B | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W6 | OEM-2-C | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W7 | OEM-2-D | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W8 | SP-GND-1 | EMUPRO16-A-11 | 0.85 | no route | Power GND | — | |
| W9 | SP-GND-1 | EMUPRO16-A-17 | 0.85 | no route | Power GND | — | |
| W10 | SP-GND-1 | EMUPRO16-A-19 | 0.85 | no route | Power GND | — | |
| W11 | SP-GND-1 | EMUPRO16-B-19 | 0.85 | no route | Power GND | — | |
| W12 | SP-GND-1 | EMUPRO16-C-30 | 0.85 | no route | Power GND | — | |
| W13 | SP-GND-1 | EMUPRO16-D-18 | 0.85 | no route | Power GND | — | |
| W14 | OEM-2-F | SP-0V-1 | 0.5 | no route | MAF ground | — | |
| W15 | SP-0V-1 | EMUPRO16-A-20 | 0.5 | no route | Digital GND | — | |
| W16 | SP-0V-1 | EMUPRO16-B-9 | 0.5 | no route | Digital GND (flash drive) | — | |
| W17 | SP-0V-1 | EMUPRO16-C-29 | 0.5 | no route | Analog GND | — | |
| W18 | SP-0V-1 | EMUPRO16-D-17 | 0.5 | no route | Analog GND | — | |
| W19 | OEM-2-K | EMUPRO16-A-12 | 0.5 | no route | +5V sensor supply | — | |
| W20 | OEM-2-E | EMUPRO16-A-21 | 0.5 | no route | Crank position (CAS NE) | — | |
| W21 | OEM-1-G | EMUPRO16-A-30 | 0.5 | no route | Ignition 1 (coils 1+4, wasted spark) | — | |
| W22 | OEM-1-H | EMUPRO16-A-29 | 0.5 | no route | Ignition 2 (coils 2+3, wasted spark) | — | |
| W23 | OEM-2-U | EMUPRO16-A-2 | 0.5 | no route | Injector 1 | — | |
| W24 | OEM-2-V | EMUPRO16-A-3 | 0.5 | no route | Injector 2 | — | |
| W25 | OEM-2-Y | EMUPRO16-A-4 | 0.5 | no route | Injector 3 | — | |
| W26 | OEM-2-Z | EMUPRO16-A-5 | 0.5 | no route | Injector 4 | — | |
| W27 | OEM-1-J | EMUPRO16-B-1 | 0.5 | no route | A/C relay | — | |
| W28 | OEM-1-R | EMUPRO16-B-2 | 0.5 | no route | Cooling fan relay | — | |
| W29 | OEM-2-S | EMUPRO16-B-3 | 0.5 | no route | Condenser fan relay | — | |
| W30 | OEM-2-T | EMUPRO16-B-4 | 0.5 | no route | Fuel pump relay | — | |
| W31 | OEM-2-W | EMUPRO16-B-5 | 0.5 | no route | ISC solenoid | — | |
| W32 | OEM-1-E | EMUPRO16-B-6 | 0.5 | no route | Malfunction indicator lamp (MIL) | — | |
| W33 | OEM-2-R | EMUPRO16-B-7 | 0.5 | no route | PRC solenoid (fuel pressure regulator) | — | |
| W34 | OEM-2-X | EMUPRO16-B-13 | 0.5 | no route | Evap purge solenoid | — | |
| W35 | OEM-2-I | EMUPRO16-A-25 | 0.5 | no route | Tachometer output | — | |
| W36 | OEM-2-O | EMUPRO16-C-31 | 0.5 | no route | Mass air flow (MAF) | — | |
| W37 | OEM-2-M | EMUPRO16-C-18 | 0.5 | no route | Throttle position (TPS) | — | |
| W38 | OEM-2-N | EMUPRO16-C-32 | 0.5 | no route | O2 sensor | — | |
| W39 | OEM-2-Q | EMUPRO16-C-11 | 0.5 | no route | Coolant temperature (ECT) | — | |
| W40 | OEM-2-P | EMUPRO16-C-33 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W41 | OEM-1-M | EMUPRO16-A-13 | 0.5 | no route | Vehicle speed | — | |
| W42 | OEM-1-C | EMUPRO16-A-22 | 0.5 | no route | Start signal | — | |
| W43 | OEM-1-P | EMUPRO16-A-14 | 0.5 | no route | Power steering pressure switch | — | |
| W44 | OEM-1-Q | EMUPRO16-A-24 | 0.5 | no route | A/C request | — | |
| W45 | OEM-1-V | EMUPRO16-A-16 | 0.5 | no route | Neutral/clutch switch | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|---|---|---|---|---|
| connector | 1473416-1 | TE | Superseal 1.0 26-way plug, Key 3 | 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 |
| connector | 3-1437290-7 | TE | Superseal 1.0 26-way plug | 1.000 | ea |
| connector | 4-1437290-0 | TE | Superseal 1.0 34-way plug, Key 1 | 1.000 | ea |
| connector | 4-1437290-1 | TE | Superseal 1.0 34-way plug, Key 2 | 1.000 | ea |
| terminal | 3-1447221-4 | TE | Superseal 1.0 socket terminal, 20 AWG (0.5 sq mm) | 39.000 | 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 |
|---|---|---|---|
| error | REQUIRED_UNMAPPED | OEM-2-G | Required OEM function "Cam position (CAS G)" (trigger_in) is not connected to the new ECU. |
| info | NET_FAMILY | OEM-2-I ↔ EMUPRO16-A-25 | OEM-2-I "Tachometer output" [tacho_out] is wired to EMUPRO16-A-25 "Auxiliary 9" [low_side_out]. Tacho as a low-side output: check the tach needs a pull-up. |
| info | NET_FAMILY | OEM-2-P ↔ EMUPRO16-C-33 | OEM-2-P "Intake air temperature (IAT)" [temp_in] is wired to EMUPRO16-C-33 "Precision analog 3" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | NET_FAMILY | OEM-2-Q ↔ EMUPRO16-C-11 | OEM-2-Q "Coolant temperature (ECT)" [temp_in] is wired to EMUPRO16-C-11 "Analog 3" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
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. Open items: - OEM-2 G: Cam position (CAS G): no free cam_hall/cam_vr/frequency_in input on ECUMASTER EMU PRO 16 Not wired: - OEM-1 A: Constant +12V: ECUMASTER EMU PRO 16 has no battery-constant input; not needed - EMUPRO16-B 15: +12V switched: 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 PRO 16 — pinout (Connectors A/B/C/D) | https://www.ecumaster.com/files/EMU_PRO/EMU_PRO_16_Pinout_v1.0.pdf | archive | 2026-10-05 | 72799bed63fb |
| 4 | vendor_doc | Link G4X MX5X install manual (NA 1.6/1.8) | https://linkecu.com/documentation/MX5X.pdf | archive | 2026-10-05 | b7f730de9f6e |