MX-5 Miata NA8 1994-97 (BP-ZE, 1.8) → MoTeC M190 13190 (auto)
MX-5 Miata NA8 1994-97 (BP-ZE, 1.8) — MoTeC — M190
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 · 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 | M190-B-H | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-14V-1 | M190-B-J | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | SP-14V-1 | M190-B-K | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | SP-14V-1 | M190-B-L | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-1-A | M190-A-38 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-2-A | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | OEM-2-B | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-2-C | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-2-D | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-GND-1 | M190-B-G | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | SP-GND-1 | M190-B-W | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | SP-GND-1 | M190-B-X | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | SP-GND-1 | M190-B-Y | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | SP-GND-1 | M190-B-Z | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | SP-GND-1 | M190-B-c | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-2-F | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | SP-0V-1 | M190-A-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | SP-0V-1 | M190-A-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | SP-0V-1 | M190-A-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | SP-0V-1 | M190-C-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | SP-0V-1 | M190-C-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | SP-0V-1 | M190-C-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | SP-0V-1 | M190-C-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-2-K | M190-A-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-2-E | M190-C-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-2-G | M190-C-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-1-G | M190-C-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-1-H | M190-C-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-2-U | M190-A-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-2-V | M190-A-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-2-Y | M190-B-U | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-2-Z | M190-A-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-1-J | M190-A-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-1-R | M190-B-V | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-2-S | M190-A-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-2-T | M190-B-b | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-2-W | M190-A-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-1-E | M190-B-S | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-2-R | M190-A-48 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-2-X | M190-B-a | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-2-O | M190-C-42 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-2-M | M190-C-36 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-2-N | M190-A-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-2-Q | M190-C-37 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-2-P | M190-C-39 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-1-M | M190-C-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | OEM-1-C | M190-A-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W49 | OEM-1-P | M190-A-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W50 | OEM-1-Q | M190-A-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W51 | OEM-1-V | M190-A-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 | M190-A-38 | M190-A-18 | open (OL) | +12 V supply must not touch sensor ground | |
| 2 | M190-A-38 | M190-B-G | open (OL) | +12 V supply must not touch power ground | |
| 3 | M190-B-H | M190-A-18 | open (OL) | +12 V supply must not touch sensor ground | |
| 4 | M190-B-H | M190-B-G | open (OL) | +12 V supply must not touch power ground | |
| 5 | M190-A-18 | M190-A-16 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 6 | M190-A-38 | M190-A-16 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 7 | M190-B-G | M190-A-16 | open (OL) | power ground must not touch 5 V sensor reference | |
| 8 | M190-B-H | M190-A-16 | open (OL) | +12 V supply must not touch 5 V sensor reference |
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
M190-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Low Side Injector 3 | — | W36 | — | 0.5 | OEM-2-S | — | — | — |
| 10 | Low Side Injector 8 | — | — | — | — | — | — | — | — |
| 11 | Peak Hold Injector 1 | — | W30 | — | 0.5 | OEM-2-U | — | — | — |
| 12 | Peak Hold Injector 2 | — | W33 | — | 0.5 | OEM-2-Z | — | — | — |
| 13 | Analogue Voltage Input 11 | — | — | — | — | — | — | — | — |
| 14 | Digital Input 2 | — | W49 | — | 0.5 | OEM-1-P | — | — | — |
| 15 | RS232 Receive | — | — | — | — | — | — | — | — |
| 16 | Sensor 5.0V C3 | — | W25 | — | 0.5 | OEM-2-K | — | — | — |
| 17 | Low Side Injector 11 | — | — | — | — | — | — | — | — |
| 18 | Sensor 0V C1 | — | W18 | — | 0.5 | SP-0V-1 | — | — | — |
| 19 | Sensor 0V C2 | — | W19 | — | 0.5 | SP-0V-1 | — | — | — |
| 2 | Low Side Injector 2 | — | W34 | — | 0.5 | OEM-1-J | — | — | — |
| 20 | Sensor 0V C3 | — | W20 | — | 0.5 | SP-0V-1 | — | — | — |
| 21 | Digital Input 1 | — | W48 | — | 0.5 | OEM-1-C | — | — | — |
| 22 | LIN Bus | — | — | — | — | — | — | — | — |
| 23 | RS232 Transmit | — | — | — | — | — | — | — | — |
| 24 | CAN Bus 2 High | — | — | — | — | — | — | — | — |
| 25 | Low Side Injector 7 | — | — | — | — | — | — | — | — |
| 26 | Peak Hold Injector 3 | — | — | — | — | — | — | — | — |
| 27 | Analogue Voltage Input 15 | — | — | — | — | — | — | — | — |
| 28 | Analogue Voltage Input 16 | — | — | — | — | — | — | — | — |
| 29 | Analogue Voltage Input 17 | — | — | — | — | — | — | — | — |
| 3 | Low Side Injector 1 | — | W31 | — | 0.5 | OEM-2-V | — | — | — |
| 30 | Digital Input 3 | — | W50 | — | 0.5 | OEM-1-Q | — | — | — |
| 31 | CAN Bus 2 Low | — | — | — | — | — | — | — | — |
| 32 | Low Side Injector 10 | — | — | — | — | — | — | — | — |
| 33 | Peak Hold Injector 4 | — | — | — | — | — | — | — | — |
| 34 | Analogue Voltage Input 13 | — | — | — | — | — | — | — | — |
| 35 | Analogue Voltage Input 12 | — | — | — | — | — | — | — | — |
| 36 | Peak Hold Injector 7 | — | — | — | — | — | — | — | — |
| 37 | Digital Input 4 | — | W51 | — | 0.5 | OEM-1-V | — | — | — |
| 38 | Battery Backup | — | W6 | — | 0.85 | OEM-1-A | — | — | — |
| 39 | CAN Bus 3 High | — | — | — | — | — | — | — | — |
| 4 | Low Side Injector 12 | — | — | — | — | — | — | — | — |
| 40 | Low Side Injector 6 | — | — | — | — | — | — | — | — |
| 41 | Analogue Voltage Input 14 | — | — | — | — | — | — | — | — |
| 42 | Peak Hold Injector 9 | — | — | — | — | — | — | — | — |
| 43 | Peak Hold Injector 10 | — | — | — | — | — | — | — | — |
| 44 | Peak Hold Injector 6 | — | — | — | — | — | — | — | — |
| 45 | Peak Hold Injector 5 | — | — | — | — | — | — | — | — |
| 46 | CAN Bus 3 Low | — | — | — | — | — | — | — | — |
| 47 | Low Side Injector 9 | — | — | — | — | — | — | — | — |
| 48 | Low Side Injector 5 | — | W40 | — | 0.5 | OEM-2-R | — | — | — |
| 49 | Peak Hold Injector 11 | — | — | — | — | — | — | — | — |
| 5 | Low Side Injector 4 | — | W38 | — | 0.5 | OEM-2-W | — | — | — |
| 50 | Peak Hold Injector 12 | — | — | — | — | — | — | — | — |
| 51 | Peak Hold Injector 8 | — | — | — | — | — | — | — | — |
| 52 | Low Side Ignition 12 | — | — | — | — | — | — | — | — |
| 53 | Low Side Ignition 9 | — | — | — | — | — | — | — | — |
| 54 | Low Side Ignition 10 | — | — | — | — | — | — | — | — |
| 55 | Low Side Ignition 11 | — | — | — | — | — | — | — | — |
| 6 | Lambda Narrow Input 2 | — | — | — | — | — | — | — | — |
| 7 | Lambda Narrow Input 1 | — | W44 | — | 0.5 | OEM-2-N | — | — | — |
| 8 | Sensor 5.0V C1 | — | — | — | — | — | — | — | — |
| 9 | Sensor 5.0V C2 | — | — | — | — | — | — | — | — |
M190-B
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Half Bridge Output 1 | — | — | — | — | — | — | — | — |
| B | Half Bridge Output 2 | — | — | — | — | — | — | — | — |
| C | Half Bridge Output 3 | — | — | — | — | — | — | — | — |
| D | Half Bridge Output 4 | — | — | — | — | — | — | — | — |
| E | Half Bridge Output 5 | — | — | — | — | — | — | — | — |
| F | Half Bridge Output 6 | — | — | — | — | — | — | — | — |
| G | Battery Negative 1 | — | W11 | — | 0.85 | SP-GND-1 | — | — | — |
| H | Battery Positive 1 | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| J | Battery Positive 2 | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| K | Battery Positive 3 | — | W4 | — | 0.85 | SP-14V-1 | — | — | — |
| L | Battery Positive 4 | — | W5 | — | 0.85 | SP-14V-1 | — | — | — |
| M | Half Bridge Output 10 | — | — | — | — | — | — | — | — |
| N | Half Bridge Output 9 | — | — | — | — | — | — | — | — |
| P | Half Bridge Output 8 | — | — | — | — | — | — | — | — |
| R | Half Bridge Output 7 | — | — | — | — | — | — | — | — |
| S | Low Side Injector 4 | — | W39 | — | 0.5 | OEM-1-E | — | — | — |
| T | Low Side Injector 6 | — | — | — | — | — | — | — | — |
| U | Low Side Injector 1 | — | W32 | — | 0.5 | OEM-2-Y | — | — | — |
| V | Low Side Injector 2 | — | W35 | — | 0.5 | OEM-1-R | — | — | — |
| W | Battery Negative 2 | — | W12 | — | 0.85 | SP-GND-1 | — | — | — |
| X | Battery Negative 3 | — | W13 | — | 0.85 | SP-GND-1 | — | — | — |
| Y | Battery Negative 4 | — | W14 | — | 0.85 | SP-GND-1 | — | — | — |
| Z | Battery Negative 5 | — | W15 | — | 0.85 | SP-GND-1 | — | — | — |
| a | Low Side Injector 5 | — | W41 | — | 0.5 | OEM-2-X | — | — | — |
| b | Low Side Injector 3 | — | W37 | — | 0.5 | OEM-2-T | — | — | — |
| c | Battery Negative 6 | — | W16 | — | 0.85 | SP-GND-1 | — | — | — |
M190-C
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Low Side Ignition 4 | — | — | — | — | — | — | — | — |
| 10 | Universal Digital Input 8 | — | — | — | — | — | — | — | — |
| 11 | Analogue Voltage Input 6 | — | — | — | — | — | — | — | — |
| 12 | Analogue Voltage Input 7 | — | — | — | — | — | — | — | — |
| 13 | Analogue Voltage Input 9 | — | — | — | — | — | — | — | — |
| 14 | Sensor 0V A1 | — | W21 | — | 0.5 | SP-0V-1 | — | — | — |
| 15 | Sensor 0V A2 | — | W22 | — | 0.5 | SP-0V-1 | — | — | — |
| 16 | Low Side Ignition 1 | — | W28 | — | 0.5 | OEM-1-G | — | — | — |
| 17 | Universal Digital Input 7 | — | — | — | — | — | — | — | — |
| 18 | Universal Digital Input 1 | — | W26 | — | 0.5 | OEM-2-E | — | — | — |
| 19 | Universal Digital Input 12 | — | — | — | — | — | — | — | — |
| 2 | Low Side Ignition 3 | — | — | — | — | — | — | — | — |
| 20 | Universal Digital Input 11 | — | — | — | — | — | — | — | — |
| 21 | Universal Digital Input 10 | — | — | — | — | — | — | — | — |
| 22 | Universal Digital Input 9 | — | — | — | — | — | — | — | — |
| 23 | Sensor 0V B1 | — | W23 | — | 0.5 | SP-0V-1 | — | — | — |
| 24 | CAN Bus 1 High | — | — | — | — | — | — | — | — |
| 25 | Universal Digital Input 3 | — | W47 | — | 0.5 | OEM-1-M | — | — | — |
| 26 | Ethernet Receive - | — | — | — | — | — | — | — | — |
| 27 | Universal Digital Input 4 | — | — | — | — | — | — | — | — |
| 28 | Analogue Voltage Input 4 | — | — | — | — | — | — | — | — |
| 29 | Analogue Voltage Input 5 | — | — | — | — | — | — | — | — |
| 3 | Low Side Ignition 8 | — | — | — | — | — | — | — | — |
| 30 | Sensor 0V B2 | — | W24 | — | 0.5 | SP-0V-1 | — | — | — |
| 31 | CAN Bus 1 Low | — | — | — | — | — | — | — | — |
| 32 | Universal Digital Input 2 | — | W27 | — | 0.5 | OEM-2-G | — | — | — |
| 33 | Ethernet Receive + | — | — | — | — | — | — | — | — |
| 34 | Ethernet Transmit - | — | — | — | — | — | — | — | — |
| 35 | Analogue Voltage Input 3 | — | — | — | — | — | — | — | — |
| 36 | Analogue Voltage Input 2 | — | W43 | — | 0.5 | OEM-2-M | — | — | — |
| 37 | Analogue Temperature Input 1 | — | W45 | — | 0.5 | OEM-2-Q | — | — | — |
| 38 | Analogue Temperature Input 3 | — | — | — | — | — | — | — | — |
| 39 | Analogue Temperature Input 2 | — | W46 | — | 0.5 | OEM-2-P | — | — | — |
| 4 | Low Side Ignition 6 | — | — | — | — | — | — | — | — |
| 40 | Universal Digital Input 5 | — | — | — | — | — | — | — | — |
| 41 | Ethernet Transmit + | — | — | — | — | — | — | — | — |
| 42 | Analogue Voltage Input 1 | — | W42 | — | 0.5 | OEM-2-O | — | — | — |
| 43 | Knock Input 3 | — | — | — | — | — | — | — | — |
| 44 | Knock Input 2 | — | — | — | — | — | — | — | — |
| 45 | Analogue Temperature Input 5 | — | — | — | — | — | — | — | — |
| 46 | Analogue Temperature Input 4 | — | — | — | — | — | — | — | — |
| 47 | Universal Digital Input 6 | — | — | — | — | — | — | — | — |
| 48 | Sensor 5.0V A1 | — | — | — | — | — | — | — | — |
| 49 | Knock Input 4 | — | — | — | — | — | — | — | — |
| 5 | Low Side Ignition 5 | — | — | — | — | — | — | — | — |
| 50 | Sensor 5.0V B1 | — | — | — | — | — | — | — | — |
| 51 | Knock Input 1 | — | — | — | — | — | — | — | — |
| 52 | Analogue Temperature Input 6 | — | — | — | — | — | — | — | — |
| 53 | Sensor 5.0V A2 | — | — | — | — | — | — | — | — |
| 54 | Sensor 6.3V | — | — | — | — | — | — | — | — |
| 55 | Sensor 5.0V B2 | — | — | — | — | — | — | — | — |
| 6 | Analogue Voltage Input 8 | — | — | — | — | — | — | — | — |
| 7 | Analogue Voltage Input 10 | — | — | — | — | — | — | — | — |
| 8 | Low Side Ignition 2 | — | W29 | — | 0.5 | OEM-1-H | — | — | — |
| 9 | Low Side Ignition 7 | — | — | — | — | — | — | — | — |
OEM-1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Constant +12V | — | W6 | — | 0.85 | M190-A-38 | — | — | — |
| B | ECU power +14V (main relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| C | Start signal | — | W48 | — | 0.5 | M190-A-21 | — | — | — |
| E | Malfunction indicator lamp (MIL) | — | W39 | — | 0.5 | M190-B-S | — | — | — |
| G | Ignition 1 (coils 1+4, wasted spark) | — | W28 | — | 0.5 | M190-C-16 | — | — | — |
| H | Ignition 2 (coils 2+3, wasted spark) | — | W29 | — | 0.5 | M190-C-8 | — | — | — |
| J | A/C relay | — | W34 | — | 0.5 | M190-A-2 | — | — | — |
| M | Vehicle speed | — | W47 | — | 0.5 | M190-C-25 | — | — | — |
| P | Power steering pressure switch | — | W49 | — | 0.5 | M190-A-14 | — | — | — |
| Q | A/C request | — | W50 | — | 0.5 | M190-A-30 | — | — | — |
| R | Cooling fan relay | — | W35 | — | 0.5 | M190-B-V | — | — | — |
| V | Neutral/clutch switch | — | W51 | — | 0.5 | M190-A-37 | — | — | — |
OEM-2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Power ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| B | Power ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| C | Power ground | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| D | Power ground | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
| E | Crank position (CAS NE) | — | W26 | — | 0.5 | M190-C-18 | — | — | — |
| F | MAF ground | — | W17 | — | 0.5 | SP-0V-1 | — | — | — |
| G | Cam position (CAS G) | — | W27 | — | 0.5 | M190-C-32 | — | — | — |
| I | Tachometer output | — | — | — | — | — | — | — | — |
| K | +5V sensor supply | — | W25 | — | 0.5 | M190-A-16 | — | — | — |
| M | Throttle position (TPS) | — | W43 | — | 0.5 | M190-C-36 | — | — | — |
| N | O2 sensor | — | W44 | — | 0.5 | M190-A-7 | — | — | — |
| O | Mass air flow (MAF) | — | W42 | — | 0.5 | M190-C-42 | — | — | — |
| P | Intake air temperature (IAT) | — | W46 | — | 0.5 | M190-C-39 | — | — | — |
| Q | Coolant temperature (ECT) | — | W45 | — | 0.5 | M190-C-37 | — | — | — |
| R | PRC solenoid (fuel pressure regulator) | — | W40 | — | 0.5 | M190-A-48 | — | — | — |
| S | Condenser fan relay | — | W36 | — | 0.5 | M190-A-1 | — | — | — |
| T | Fuel pump relay | — | W37 | — | 0.5 | M190-B-b | — | — | — |
| U | Injector 1 | — | W30 | — | 0.5 | M190-A-11 | — | — | — |
| V | Injector 2 | — | W31 | — | 0.5 | M190-A-3 | — | — | — |
| W | ISC solenoid | — | W38 | — | 0.5 | M190-A-5 | — | — | — |
| X | Evap purge solenoid | — | W41 | — | 0.5 | M190-B-a | — | — | — |
| Y | Injector 3 | — | W32 | — | 0.5 | M190-B-U | — | — | — |
| Z | Injector 4 | — | W33 | — | 0.5 | M190-A-12 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W17 | — | 0.5 | OEM-2-F | — | — | — |
| 1 | — | — | W18 | — | 0.5 | M190-A-18 | — | — | — |
| 1 | — | — | W19 | — | 0.5 | M190-A-19 | — | — | — |
| 1 | — | — | W20 | — | 0.5 | M190-A-20 | — | — | — |
| 1 | — | — | W21 | — | 0.5 | M190-C-14 | — | — | — |
| 1 | — | — | W22 | — | 0.5 | M190-C-15 | — | — | — |
| 1 | — | — | W23 | — | 0.5 | M190-C-23 | — | — | — |
| 1 | — | — | W24 | — | 0.5 | M190-C-30 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-1-B | — | — | — |
| 1 | — | — | W2 | — | 0.85 | M190-B-H | — | — | — |
| 1 | — | — | W3 | — | 0.85 | M190-B-J | — | — | — |
| 1 | — | — | W4 | — | 0.85 | M190-B-K | — | — | — |
| 1 | — | — | W5 | — | 0.85 | M190-B-L | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W7 | — | 0.85 | OEM-2-A | — | — | — |
| 1 | — | — | W8 | — | 0.85 | OEM-2-B | — | — | — |
| 1 | — | — | W9 | — | 0.85 | OEM-2-C | — | — | — |
| 1 | — | — | W10 | — | 0.85 | OEM-2-D | — | — | — |
| 1 | — | — | W11 | — | 0.85 | M190-B-G | — | — | — |
| 1 | — | — | W12 | — | 0.85 | M190-B-W | — | — | — |
| 1 | — | — | W13 | — | 0.85 | M190-B-X | — | — | — |
| 1 | — | — | W14 | — | 0.85 | M190-B-Y | — | — | — |
| 1 | — | — | W15 | — | 0.85 | M190-B-Z | — | — | — |
| 1 | — | — | W16 | — | 0.85 | M190-B-c | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-1-A | Constant +12V | power_in | M190-A-38 | Battery Backup | power_in | single_source | |
| OEM-1-B | ECU power +14V (main relay) | power_in | M190-B-H + M190-B-J + M190-B-K + M190-B-L | Battery Positive 1 + Battery Positive 2 + Battery Positive 3 + Battery Positive 4 | power_in | single_source | |
| OEM-1-C | Start signal | digital_in | M190-A-21 | Digital Input 1 | digital_in | single_source | |
| OEM-1-E | Malfunction indicator lamp (MIL) | low_side_out | M190-B-S | Low Side Injector 4 | injector_out | single_source | |
| OEM-1-G | Ignition 1 (coils 1+4, wasted spark) | ignition_out | M190-C-16 | Low Side Ignition 1 | ignition_out | single_source | |
| OEM-1-H | Ignition 2 (coils 2+3, wasted spark) | ignition_out | M190-C-8 | Low Side Ignition 2 | ignition_out | single_source | |
| OEM-1-J | A/C relay | low_side_out | M190-A-2 | Low Side Injector 2 | injector_out | single_source | |
| OEM-1-M | Vehicle speed | digital_in | M190-C-25 | Universal Digital Input 3 | digital_in | single_source | |
| OEM-1-P | Power steering pressure switch | digital_in | M190-A-14 | Digital Input 2 | digital_in | single_source | |
| OEM-1-Q | A/C request | digital_in | M190-A-30 | Digital Input 3 | digital_in | single_source | |
| OEM-1-R | Cooling fan relay | low_side_out | M190-B-V | Low Side Injector 2 | injector_out | single_source | |
| OEM-1-V | Neutral/clutch switch | digital_in | M190-A-37 | Digital Input 4 | digital_in | single_source | |
| OEM-2-A | Power ground | ground | M190-B-G + M190-B-W + M190-B-X + M190-B-Y + M190-B-Z + M190-B-c | Battery Negative 1 + Battery Negative 2 + Battery Negative 3 + Battery Negative 4 + Battery Negative 5 + Battery Negative 6 | ground | single_source | |
| OEM-2-B | Power ground | ground | M190-B-G + M190-B-W + M190-B-X + M190-B-Y + M190-B-Z + M190-B-c | Battery Negative 1 + Battery Negative 2 + Battery Negative 3 + Battery Negative 4 + Battery Negative 5 + Battery Negative 6 | ground | single_source | |
| OEM-2-C | Power ground | ground | M190-B-G + M190-B-W + M190-B-X + M190-B-Y + M190-B-Z + M190-B-c | Battery Negative 1 + Battery Negative 2 + Battery Negative 3 + Battery Negative 4 + Battery Negative 5 + Battery Negative 6 | ground | single_source | |
| OEM-2-D | Power ground | ground | M190-B-G + M190-B-W + M190-B-X + M190-B-Y + M190-B-Z + M190-B-c | Battery Negative 1 + Battery Negative 2 + Battery Negative 3 + Battery Negative 4 + Battery Negative 5 + Battery Negative 6 | ground | single_source | |
| OEM-2-E | Crank position (CAS NE) | trigger_in | M190-C-18 | Universal Digital Input 1 | digital_in | single_source | |
| OEM-2-F | MAF ground | sensor_ground | M190-A-18 + M190-A-19 + M190-A-20 + M190-C-14 + M190-C-15 + M190-C-23 + M190-C-30 | Sensor 0V C1 + Sensor 0V C2 + Sensor 0V C3 + Sensor 0V A1 + Sensor 0V A2 + Sensor 0V B1 + Sensor 0V B2 | sensor_ground | single_source | |
| OEM-2-G | Cam position (CAS G) | trigger_in | M190-C-32 | Universal Digital Input 2 | digital_in | single_source | |
| OEM-2-I | Tachometer output | tacho_out | — | — | — | single_source | |
| OEM-2-K | +5V sensor supply | vref | M190-A-16 | Sensor 5.0V C3 | vref | single_source | |
| OEM-2-M | Throttle position (TPS) | analog_in | M190-C-36 | Analogue Voltage Input 2 | analog_in | single_source | |
| OEM-2-N | O2 sensor | lambda_nb_in | M190-A-7 | Lambda Narrow Input 1 | lambda_nb_in | single_source | |
| OEM-2-O | Mass air flow (MAF) | analog_in | M190-C-42 | Analogue Voltage Input 1 | analog_in | single_source | |
| OEM-2-P | Intake air temperature (IAT) | temp_in | M190-C-39 | Analogue Temperature Input 2 | temp_in | single_source | |
| OEM-2-Q | Coolant temperature (ECT) | temp_in | M190-C-37 | Analogue Temperature Input 1 | temp_in | single_source | |
| OEM-2-R | PRC solenoid (fuel pressure regulator) | low_side_out | M190-A-48 | Low Side Injector 5 | injector_out | single_source | |
| OEM-2-S | Condenser fan relay | low_side_out | M190-A-1 | Low Side Injector 3 | injector_out | single_source | |
| OEM-2-T | Fuel pump relay | low_side_out | M190-B-b | Low Side Injector 3 | injector_out | single_source | |
| OEM-2-U | Injector 1 | injector_out | M190-A-11 | Peak Hold Injector 1 | injector_out | single_source | |
| OEM-2-V | Injector 2 | injector_out | M190-A-3 | Low Side Injector 1 | injector_out | single_source | |
| OEM-2-W | ISC solenoid | low_side_out | M190-A-5 | Low Side Injector 4 | injector_out | single_source | |
| OEM-2-X | Evap purge solenoid | low_side_out | M190-B-a | Low Side Injector 5 | injector_out | single_source | |
| OEM-2-Y | Injector 3 | injector_out | M190-B-U | Low Side Injector 1 | injector_out | single_source | |
| OEM-2-Z | Injector 4 | injector_out | M190-A-12 | Peak Hold Injector 2 | 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 | M190-B-H | 0.85 | no route | Battery Positive 1 | — | |
| W3 | SP-14V-1 | M190-B-J | 0.85 | no route | Battery Positive 2 | — | |
| W4 | SP-14V-1 | M190-B-K | 0.85 | no route | Battery Positive 3 | — | |
| W5 | SP-14V-1 | M190-B-L | 0.85 | no route | Battery Positive 4 | — | |
| W6 | OEM-1-A | M190-A-38 | 0.85 | no route | Constant +12V | — | |
| W7 | OEM-2-A | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W8 | OEM-2-B | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W9 | OEM-2-C | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W10 | OEM-2-D | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W11 | SP-GND-1 | M190-B-G | 0.85 | no route | Battery Negative 1 | — | |
| W12 | SP-GND-1 | M190-B-W | 0.85 | no route | Battery Negative 2 | — | |
| W13 | SP-GND-1 | M190-B-X | 0.85 | no route | Battery Negative 3 | — | |
| W14 | SP-GND-1 | M190-B-Y | 0.85 | no route | Battery Negative 4 | — | |
| W15 | SP-GND-1 | M190-B-Z | 0.85 | no route | Battery Negative 5 | — | |
| W16 | SP-GND-1 | M190-B-c | 0.85 | no route | Battery Negative 6 | — | |
| W17 | OEM-2-F | SP-0V-1 | 0.5 | no route | MAF ground | — | |
| W18 | SP-0V-1 | M190-A-18 | 0.5 | no route | Sensor 0V C1 | — | |
| W19 | SP-0V-1 | M190-A-19 | 0.5 | no route | Sensor 0V C2 | — | |
| W20 | SP-0V-1 | M190-A-20 | 0.5 | no route | Sensor 0V C3 | — | |
| W21 | SP-0V-1 | M190-C-14 | 0.5 | no route | Sensor 0V A1 | — | |
| W22 | SP-0V-1 | M190-C-15 | 0.5 | no route | Sensor 0V A2 | — | |
| W23 | SP-0V-1 | M190-C-23 | 0.5 | no route | Sensor 0V B1 | — | |
| W24 | SP-0V-1 | M190-C-30 | 0.5 | no route | Sensor 0V B2 | — | |
| W25 | OEM-2-K | M190-A-16 | 0.5 | no route | +5V sensor supply | — | |
| W26 | OEM-2-E | M190-C-18 | 0.5 | no route | Crank position (CAS NE) | — | |
| W27 | OEM-2-G | M190-C-32 | 0.5 | no route | Cam position (CAS G) | — | |
| W28 | OEM-1-G | M190-C-16 | 0.5 | no route | Ignition 1 (coils 1+4, wasted spark) | — | |
| W29 | OEM-1-H | M190-C-8 | 0.5 | no route | Ignition 2 (coils 2+3, wasted spark) | — | |
| W30 | OEM-2-U | M190-A-11 | 0.5 | no route | Injector 1 | — | |
| W31 | OEM-2-V | M190-A-3 | 0.5 | no route | Injector 2 | — | |
| W32 | OEM-2-Y | M190-B-U | 0.5 | no route | Injector 3 | — | |
| W33 | OEM-2-Z | M190-A-12 | 0.5 | no route | Injector 4 | — | |
| W34 | OEM-1-J | M190-A-2 | 0.5 | no route | A/C relay | — | |
| W35 | OEM-1-R | M190-B-V | 0.5 | no route | Cooling fan relay | — | |
| W36 | OEM-2-S | M190-A-1 | 0.5 | no route | Condenser fan relay | — | |
| W37 | OEM-2-T | M190-B-b | 0.5 | no route | Fuel pump relay | — | |
| W38 | OEM-2-W | M190-A-5 | 0.5 | no route | ISC solenoid | — | |
| W39 | OEM-1-E | M190-B-S | 0.5 | no route | Malfunction indicator lamp (MIL) | — | |
| W40 | OEM-2-R | M190-A-48 | 0.5 | no route | PRC solenoid (fuel pressure regulator) | — | |
| W41 | OEM-2-X | M190-B-a | 0.5 | no route | Evap purge solenoid | — | |
| W42 | OEM-2-O | M190-C-42 | 0.5 | no route | Mass air flow (MAF) | — | |
| W43 | OEM-2-M | M190-C-36 | 0.5 | no route | Throttle position (TPS) | — | |
| W44 | OEM-2-N | M190-A-7 | 0.5 | no route | O2 sensor | — | |
| W45 | OEM-2-Q | M190-C-37 | 0.5 | no route | Coolant temperature (ECT) | — | |
| W46 | OEM-2-P | M190-C-39 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W47 | OEM-1-M | M190-C-25 | 0.5 | no route | Vehicle speed | — | |
| W48 | OEM-1-C | M190-A-21 | 0.5 | no route | Start signal | — | |
| W49 | OEM-1-P | M190-A-14 | 0.5 | no route | Power steering pressure switch | — | |
| W50 | OEM-1-Q | M190-A-30 | 0.5 | no route | A/C request | — | |
| W51 | OEM-1-V | M190-A-37 | 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 (11)
| Severity | Code | Subject | Message |
|---|---|---|---|
| warn | NET_FAMILY | OEM-2-E ↔ M190-C-18 | OEM-2-E "Crank position (CAS NE)" [trigger_in] is wired to M190-C-18 "Universal Digital Input 1" [digital_in]. Hall-type cam/speed signals can use a digital input if it handles the frequency; VR signals cannot. |
| warn | NET_FAMILY | OEM-2-G ↔ M190-C-32 | OEM-2-G "Cam position (CAS G)" [trigger_in] is wired to M190-C-32 "Universal Digital Input 2" [digital_in]. Hall-type cam/speed signals can use a digital input if it handles the frequency; VR signals cannot. |
| info | NET_FAMILY | OEM-1-E ↔ M190-B-S | OEM-1-E "Malfunction indicator lamp (MIL)" [low_side_out] is wired to M190-B-S "Low Side Injector 4" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-1-J ↔ M190-A-2 | OEM-1-J "A/C relay" [low_side_out] is wired to M190-A-2 "Low Side Injector 2" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-1-R ↔ M190-B-V | OEM-1-R "Cooling fan relay" [low_side_out] is wired to M190-B-V "Low Side Injector 2" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-2-R ↔ M190-A-48 | OEM-2-R "PRC solenoid (fuel pressure regulator)" [low_side_out] is wired to M190-A-48 "Low Side Injector 5" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-2-S ↔ M190-A-1 | OEM-2-S "Condenser fan relay" [low_side_out] is wired to M190-A-1 "Low Side Injector 3" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-2-T ↔ M190-B-b | OEM-2-T "Fuel pump relay" [low_side_out] is wired to M190-B-b "Low Side Injector 3" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-2-W ↔ M190-A-5 | OEM-2-W "ISC solenoid" [low_side_out] is wired to M190-A-5 "Low Side Injector 4" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-2-X ↔ M190-B-a | OEM-2-X "Evap purge solenoid" [low_side_out] is wired to M190-B-a "Low Side Injector 5" [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 (0)
| Code | Subject | Reason | By |
|---|
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-2 I: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on MoTeC M190
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 | MoTeC: M1 ECU Hardware manual (7 Nov 2013) — M130/M150/M170/M190 pinout tables | https://web.archive.org/web/2023id_/https://www.motec.com.au/hessian/uploads/M1_ECU_Hardware_c2517380e4.pdf | — | 2026-10-05 | 03dc5975f739 |