MX-5 Miata NA8 1994-97 (BP-ZE, 1.8) → MoTeC M150 13150 (auto)
MX-5 Miata NA8 1994-97 (BP-ZE, 1.8) — MoTeC — M150
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 | 48 wires · 9 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 | M150-B-13 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-14V-1 | M150-B-19 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | SP-14V-1 | M150-C-26 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-1-A | M150-D-12 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-2-A | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-2-B | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | OEM-2-C | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-2-D | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-GND-1 | M150-A-24 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-GND-1 | M150-A-25 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | SP-GND-1 | M150-A-32 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | SP-GND-1 | M150-C-10 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | SP-GND-1 | M150-C-11 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-2-F | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | SP-0V-1 | M150-A-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | SP-0V-1 | M150-A-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | SP-0V-1 | M150-A-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | SP-0V-1 | M150-A-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | SP-0V-1 | M150-D-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | SP-0V-1 | M150-D-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-2-K | M150-A-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-2-E | M150-D-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-2-G | M150-D-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-1-G | M150-C-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-1-H | M150-C-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-2-U | M150-C-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-2-V | M150-C-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-2-Y | M150-C-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-2-Z | M150-C-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-1-J | M150-B-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-1-R | M150-B-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-2-S | M150-B-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-2-T | M150-B-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-2-W | M150-C-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-1-E | M150-C-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-2-R | M150-C-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-2-X | M150-C-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-2-O | M150-C-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-2-M | M150-C-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-2-N | M150-A-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-2-Q | M150-D-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-2-P | M150-D-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-1-M | M150-D-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-1-C | M150-A-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-1-P | M150-A-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-1-Q | M150-A-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | OEM-1-V | M150-A-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 | M150-B-13 | M150-A-24 | open (OL) | +12 V supply must not touch power ground | |
| 2 | M150-B-13 | M150-A-26 | open (OL) | +12 V supply must not touch sensor ground | |
| 3 | M150-D-12 | M150-A-24 | open (OL) | +12 V supply must not touch power ground | |
| 4 | M150-D-12 | M150-A-26 | open (OL) | +12 V supply must not touch sensor ground | |
| 5 | M150-A-24 | M150-A-10 | open (OL) | power ground must not touch 5 V sensor reference | |
| 6 | M150-A-26 | M150-A-10 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 7 | M150-B-13 | M150-A-10 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 8 | M150-D-12 | M150-A-10 | open (OL) | +12 V supply must not touch 5 V sensor reference |
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
M150-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Analogue Temperature Input 5 | — | — | — | — | — | — | — | — |
| 10 | Sensor 5.0V C1 | — | W22 | — | 0.5 | OEM-2-K | — | — | — |
| 11 | Lambda Narrow Input 1 | — | W41 | — | 0.5 | OEM-2-N | — | — | — |
| 12 | Lambda Narrow Input 2 | — | — | — | — | — | — | — | — |
| 13 | Knock Input 3 | — | — | — | — | — | — | — | — |
| 14 | Knock Input 4 | — | — | — | — | — | — | — | — |
| 15 | Digital Input 2 | — | W46 | — | 0.5 | OEM-1-P | — | — | — |
| 16 | Digital Input 3 | — | W47 | — | 0.5 | OEM-1-Q | — | — | — |
| 17 | Digital Input 4 | — | W48 | — | 0.5 | OEM-1-V | — | — | — |
| 18 | Sensor 5.0V C2 | — | — | — | — | — | — | — | — |
| 19 | Sensor 5.0V B2 | — | — | — | — | — | — | — | — |
| 2 | Analogue Temperature Input 6 | — | — | — | — | — | — | — | — |
| 20 | LIN Bus | — | — | — | — | — | — | — | — |
| 21 | RS232 Receive | — | — | — | — | — | — | — | — |
| 22 | RS232 Transmit | — | — | — | — | — | — | — | — |
| 23 | Digital Input 1 | — | W45 | — | 0.5 | OEM-1-C | — | — | — |
| 24 | Battery Negative 3 | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
| 25 | Battery Negative 4 | — | W11 | — | 0.85 | SP-GND-1 | — | — | — |
| 26 | Sensor 0V C1 | — | W16 | — | 0.5 | SP-0V-1 | — | — | — |
| 27 | Sensor 0V C2 | — | W17 | — | 0.5 | SP-0V-1 | — | — | — |
| 28 | CAN Bus 3 High | — | — | — | — | — | — | — | — |
| 29 | CAN Bus 3 Low | — | — | — | — | — | — | — | — |
| 3 | Analogue Voltage Input 15 | — | — | — | — | — | — | — | — |
| 30 | CAN Bus 2 High | — | — | — | — | — | — | — | — |
| 31 | CAN Bus 2 Low | — | — | — | — | — | — | — | — |
| 32 | Battery Negative 5 | — | W12 | — | 0.85 | SP-GND-1 | — | — | — |
| 33 | Sensor 0V B1 | — | W18 | — | 0.5 | SP-0V-1 | — | — | — |
| 34 | Sensor 0V A1 | — | W19 | — | 0.5 | SP-0V-1 | — | — | — |
| 4 | Analogue Voltage Input 16 | — | — | — | — | — | — | — | — |
| 5 | Analogue Voltage Input 17 | — | — | — | — | — | — | — | — |
| 6 | Low Side Ignition 9 | — | — | — | — | — | — | — | — |
| 7 | Low Side Ignition 10 | — | — | — | — | — | — | — | — |
| 8 | Low Side Ignition 11 | — | — | — | — | — | — | — | — |
| 9 | Low Side Ignition 12 | — | — | — | — | — | — | — | — |
M150-B
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Half Bridge Output 9 | — | — | — | — | — | — | — | — |
| 10 | Analogue Voltage Input 9 | — | — | — | — | — | — | — | — |
| 11 | Analogue Voltage Input 10 | — | — | — | — | — | — | — | — |
| 12 | Analogue Voltage Input 11 | — | — | — | — | — | — | — | — |
| 13 | Battery Positive | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 14 | Low Side Injector 6 | — | W34 | — | 0.5 | OEM-2-T | — | — | — |
| 15 | Low Side Injector 4 | — | W32 | — | 0.5 | OEM-1-R | — | — | — |
| 16 | Analogue Voltage Input 12 | — | — | — | — | — | — | — | — |
| 17 | Analogue Voltage Input 13 | — | — | — | — | — | — | — | — |
| 18 | Analogue Voltage Input 14 | — | — | — | — | — | — | — | — |
| 19 | Battery Positive | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 2 | Half Bridge Output 10 | — | — | — | — | — | — | — | — |
| 20 | Half Bridge Output 7 | — | — | — | — | — | — | — | — |
| 21 | Half Bridge Output 8 | — | — | — | — | — | — | — | — |
| 22 | Peak Hold Injector 9 | — | — | — | — | — | — | — | — |
| 23 | Peak Hold Injector 10 | — | — | — | — | — | — | — | — |
| 24 | Peak Hold Injector 11 | — | — | — | — | — | — | — | — |
| 25 | Peak Hold Injector 12 | — | — | — | — | — | — | — | — |
| 26 | Sensor 5.0V A | — | — | — | — | — | — | — | — |
| 3 | Universal Digital Input 8 | — | — | — | — | — | — | — | — |
| 4 | Universal Digital Input 9 | — | — | — | — | — | — | — | — |
| 5 | Universal Digital Input 10 | — | — | — | — | — | — | — | — |
| 6 | Universal Digital Input 11 | — | — | — | — | — | — | — | — |
| 7 | Universal Digital Input 12 | — | — | — | — | — | — | — | — |
| 8 | Low Side Injector 5 | — | W33 | — | 0.5 | OEM-2-S | — | — | — |
| 9 | Low Side Injector 3 | — | W31 | — | 0.5 | OEM-1-J | — | — | — |
M150-C
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Half Bridge Output 2 | — | — | — | — | — | — | — | — |
| 10 | Battery Negative 1 | — | W13 | — | 0.85 | SP-GND-1 | — | — | — |
| 11 | Battery Negative 2 | — | W14 | — | 0.85 | SP-GND-1 | — | — | — |
| 12 | Low Side Ignition 7 | — | — | — | — | — | — | — | — |
| 13 | Low Side Ignition 8 | — | — | — | — | — | — | — | — |
| 14 | Analogue Voltage Input 1 | — | W39 | — | 0.5 | OEM-2-O | — | — | — |
| 15 | Analogue Voltage Input 2 | — | W40 | — | 0.5 | OEM-2-M | — | — | — |
| 16 | Analogue Voltage Input 3 | — | — | — | — | — | — | — | — |
| 17 | Analogue Voltage Input 4 | — | — | — | — | — | — | — | — |
| 18 | Half Bridge Output 1 | — | — | — | — | — | — | — | — |
| 19 | Peak Hold Injector 1 | — | W27 | — | 0.5 | OEM-2-U | — | — | — |
| 2 | Sensor 5.0V A | — | — | — | — | — | — | — | — |
| 20 | Peak Hold Injector 2 | — | W29 | — | 0.5 | OEM-2-Y | — | — | — |
| 21 | Peak Hold Injector 3 | — | W35 | — | 0.5 | OEM-2-W | — | — | — |
| 22 | Peak Hold Injector 4 | — | W36 | — | 0.5 | OEM-1-E | — | — | — |
| 23 | Low Side Injector 1 | — | W28 | — | 0.5 | OEM-2-V | — | — | — |
| 24 | Low Side Injector 2 | — | W30 | — | 0.5 | OEM-2-Z | — | — | — |
| 25 | Analogue Voltage Input 5 | — | — | — | — | — | — | — | — |
| 26 | Battery Positive | — | W4 | — | 0.85 | SP-14V-1 | — | — | — |
| 27 | Peak Hold Injector 5 | — | W37 | — | 0.5 | OEM-2-R | — | — | — |
| 28 | Peak Hold Injector 6 | — | W38 | — | 0.5 | OEM-2-X | — | — | — |
| 29 | Peak Hold Injector 7 | — | — | — | — | — | — | — | — |
| 3 | Low Side Ignition 1 | — | W25 | — | 0.5 | OEM-1-G | — | — | — |
| 30 | Peak Hold Injector 8 | — | — | — | — | — | — | — | — |
| 31 | Half Bridge Output 3 | — | — | — | — | — | — | — | — |
| 32 | Half Bridge Output 4 | — | — | — | — | — | — | — | — |
| 33 | Half Bridge Output 5 | — | — | — | — | — | — | — | — |
| 34 | Half Bridge Output 6 | — | — | — | — | — | — | — | — |
| 4 | Low Side Ignition 2 | — | W26 | — | 0.5 | OEM-1-H | — | — | — |
| 5 | Low Side Ignition 3 | — | — | — | — | — | — | — | — |
| 6 | Low Side Ignition 4 | — | — | — | — | — | — | — | — |
| 7 | Low Side Ignition 5 | — | — | — | — | — | — | — | — |
| 8 | Low Side Ignition 6 | — | — | — | — | — | — | — | — |
| 9 | Sensor 5.0V B | — | — | — | — | — | — | — | — |
M150-D
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Universal Digital Input 1 | — | W23 | — | 0.5 | OEM-2-E | — | — | — |
| 10 | Universal Digital Input 5 | — | — | — | — | — | — | — | — |
| 11 | Universal Digital Input 6 | — | — | — | — | — | — | — | — |
| 12 | Battery Backup | — | W5 | — | 0.85 | OEM-1-A | — | — | — |
| 13 | Knock Input 2 | — | — | — | — | — | — | — | — |
| 14 | Universal Digital Input 7 | — | — | — | — | — | — | — | — |
| 15 | Sensor 0V A | — | W20 | — | 0.5 | SP-0V-1 | — | — | — |
| 16 | Sensor 0V B | — | W21 | — | 0.5 | SP-0V-1 | — | — | — |
| 17 | CAN Bus 1 High | — | — | — | — | — | — | — | — |
| 18 | CAN Bus 1 Low | — | — | — | — | — | — | — | — |
| 19 | Sensor 6.3V | — | — | — | — | — | — | — | — |
| 2 | Universal Digital Input 2 | — | W24 | — | 0.5 | OEM-2-G | — | — | — |
| 20 | Analogue Voltage Input 6 | — | — | — | — | — | — | — | — |
| 21 | Analogue Voltage Input 7 | — | — | — | — | — | — | — | — |
| 22 | Analogue Voltage Input 8 | — | — | — | — | — | — | — | — |
| 23 | Ethernet Transmit + | — | — | — | — | — | — | — | — |
| 24 | Ethernet Transmit - | — | — | — | — | — | — | — | — |
| 25 | Ethernet Receive + | — | — | — | — | — | — | — | — |
| 26 | Ethernet Receive - | — | — | — | — | — | — | — | — |
| 3 | Analogue Temperature Input 1 | — | W42 | — | 0.5 | OEM-2-Q | — | — | — |
| 4 | Analogue Temperature Input 2 | — | W43 | — | 0.5 | OEM-2-P | — | — | — |
| 5 | Analogue Temperature Input 3 | — | — | — | — | — | — | — | — |
| 6 | Analogue Temperature Input 4 | — | — | — | — | — | — | — | — |
| 7 | Knock Input 1 | — | — | — | — | — | — | — | — |
| 8 | Universal Digital Input 3 | — | W44 | — | 0.5 | OEM-1-M | — | — | — |
| 9 | Universal Digital Input 4 | — | — | — | — | — | — | — | — |
OEM-1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Constant +12V | — | W5 | — | 0.85 | M150-D-12 | — | — | — |
| B | ECU power +14V (main relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| C | Start signal | — | W45 | — | 0.5 | M150-A-23 | — | — | — |
| E | Malfunction indicator lamp (MIL) | — | W36 | — | 0.5 | M150-C-22 | — | — | — |
| G | Ignition 1 (coils 1+4, wasted spark) | — | W25 | — | 0.5 | M150-C-3 | — | — | — |
| H | Ignition 2 (coils 2+3, wasted spark) | — | W26 | — | 0.5 | M150-C-4 | — | — | — |
| J | A/C relay | — | W31 | — | 0.5 | M150-B-9 | — | — | — |
| M | Vehicle speed | — | W44 | — | 0.5 | M150-D-8 | — | — | — |
| P | Power steering pressure switch | — | W46 | — | 0.5 | M150-A-15 | — | — | — |
| Q | A/C request | — | W47 | — | 0.5 | M150-A-16 | — | — | — |
| R | Cooling fan relay | — | W32 | — | 0.5 | M150-B-15 | — | — | — |
| V | Neutral/clutch switch | — | W48 | — | 0.5 | M150-A-17 | — | — | — |
OEM-2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Power ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| B | Power ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| C | Power ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| D | Power ground | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| E | Crank position (CAS NE) | — | W23 | — | 0.5 | M150-D-1 | — | — | — |
| F | MAF ground | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| G | Cam position (CAS G) | — | W24 | — | 0.5 | M150-D-2 | — | — | — |
| I | Tachometer output | — | — | — | — | — | — | — | — |
| K | +5V sensor supply | — | W22 | — | 0.5 | M150-A-10 | — | — | — |
| M | Throttle position (TPS) | — | W40 | — | 0.5 | M150-C-15 | — | — | — |
| N | O2 sensor | — | W41 | — | 0.5 | M150-A-11 | — | — | — |
| O | Mass air flow (MAF) | — | W39 | — | 0.5 | M150-C-14 | — | — | — |
| P | Intake air temperature (IAT) | — | W43 | — | 0.5 | M150-D-4 | — | — | — |
| Q | Coolant temperature (ECT) | — | W42 | — | 0.5 | M150-D-3 | — | — | — |
| R | PRC solenoid (fuel pressure regulator) | — | W37 | — | 0.5 | M150-C-27 | — | — | — |
| S | Condenser fan relay | — | W33 | — | 0.5 | M150-B-8 | — | — | — |
| T | Fuel pump relay | — | W34 | — | 0.5 | M150-B-14 | — | — | — |
| U | Injector 1 | — | W27 | — | 0.5 | M150-C-19 | — | — | — |
| V | Injector 2 | — | W28 | — | 0.5 | M150-C-23 | — | — | — |
| W | ISC solenoid | — | W35 | — | 0.5 | M150-C-21 | — | — | — |
| X | Evap purge solenoid | — | W38 | — | 0.5 | M150-C-28 | — | — | — |
| Y | Injector 3 | — | W29 | — | 0.5 | M150-C-20 | — | — | — |
| Z | Injector 4 | — | W30 | — | 0.5 | M150-C-24 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W15 | — | 0.5 | OEM-2-F | — | — | — |
| 1 | — | — | W16 | — | 0.5 | M150-A-26 | — | — | — |
| 1 | — | — | W17 | — | 0.5 | M150-A-27 | — | — | — |
| 1 | — | — | W18 | — | 0.5 | M150-A-33 | — | — | — |
| 1 | — | — | W19 | — | 0.5 | M150-A-34 | — | — | — |
| 1 | — | — | W20 | — | 0.5 | M150-D-15 | — | — | — |
| 1 | — | — | W21 | — | 0.5 | M150-D-16 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-1-B | — | — | — |
| 1 | — | — | W2 | — | 0.85 | M150-B-13 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | M150-B-19 | — | — | — |
| 1 | — | — | W4 | — | 0.85 | M150-C-26 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W6 | — | 0.85 | OEM-2-A | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-2-B | — | — | — |
| 1 | — | — | W8 | — | 0.85 | OEM-2-C | — | — | — |
| 1 | — | — | W9 | — | 0.85 | OEM-2-D | — | — | — |
| 1 | — | — | W10 | — | 0.85 | M150-A-24 | — | — | — |
| 1 | — | — | W11 | — | 0.85 | M150-A-25 | — | — | — |
| 1 | — | — | W12 | — | 0.85 | M150-A-32 | — | — | — |
| 1 | — | — | W13 | — | 0.85 | M150-C-10 | — | — | — |
| 1 | — | — | W14 | — | 0.85 | M150-C-11 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-1-A | Constant +12V | power_in | M150-D-12 | Battery Backup | power_in | single_source | |
| OEM-1-B | ECU power +14V (main relay) | power_in | M150-B-13 + M150-B-19 + M150-C-26 | Battery Positive + Battery Positive + Battery Positive | power_in | single_source | |
| OEM-1-C | Start signal | digital_in | M150-A-23 | Digital Input 1 | digital_in | single_source | |
| OEM-1-E | Malfunction indicator lamp (MIL) | low_side_out | M150-C-22 | Peak Hold Injector 4 | injector_out | single_source | |
| OEM-1-G | Ignition 1 (coils 1+4, wasted spark) | ignition_out | M150-C-3 | Low Side Ignition 1 | ignition_out | single_source | |
| OEM-1-H | Ignition 2 (coils 2+3, wasted spark) | ignition_out | M150-C-4 | Low Side Ignition 2 | ignition_out | single_source | |
| OEM-1-J | A/C relay | low_side_out | M150-B-9 | Low Side Injector 3 | injector_out | single_source | |
| OEM-1-M | Vehicle speed | digital_in | M150-D-8 | Universal Digital Input 3 | digital_in | single_source | |
| OEM-1-P | Power steering pressure switch | digital_in | M150-A-15 | Digital Input 2 | digital_in | single_source | |
| OEM-1-Q | A/C request | digital_in | M150-A-16 | Digital Input 3 | digital_in | single_source | |
| OEM-1-R | Cooling fan relay | low_side_out | M150-B-15 | Low Side Injector 4 | injector_out | single_source | |
| OEM-1-V | Neutral/clutch switch | digital_in | M150-A-17 | Digital Input 4 | digital_in | single_source | |
| OEM-2-A | Power ground | ground | M150-A-24 + M150-A-25 + M150-A-32 + M150-C-10 + M150-C-11 | Battery Negative 3 + Battery Negative 4 + Battery Negative 5 + Battery Negative 1 + Battery Negative 2 | ground | single_source | |
| OEM-2-B | Power ground | ground | M150-A-24 + M150-A-25 + M150-A-32 + M150-C-10 + M150-C-11 | Battery Negative 3 + Battery Negative 4 + Battery Negative 5 + Battery Negative 1 + Battery Negative 2 | ground | single_source | |
| OEM-2-C | Power ground | ground | M150-A-24 + M150-A-25 + M150-A-32 + M150-C-10 + M150-C-11 | Battery Negative 3 + Battery Negative 4 + Battery Negative 5 + Battery Negative 1 + Battery Negative 2 | ground | single_source | |
| OEM-2-D | Power ground | ground | M150-A-24 + M150-A-25 + M150-A-32 + M150-C-10 + M150-C-11 | Battery Negative 3 + Battery Negative 4 + Battery Negative 5 + Battery Negative 1 + Battery Negative 2 | ground | single_source | |
| OEM-2-E | Crank position (CAS NE) | trigger_in | M150-D-1 | Universal Digital Input 1 | digital_in | single_source | |
| OEM-2-F | MAF ground | sensor_ground | M150-A-26 + M150-A-27 + M150-A-33 + M150-A-34 + M150-D-15 + M150-D-16 | Sensor 0V C1 + Sensor 0V C2 + Sensor 0V B1 + Sensor 0V A1 + Sensor 0V A + Sensor 0V B | sensor_ground | single_source | |
| OEM-2-G | Cam position (CAS G) | trigger_in | M150-D-2 | Universal Digital Input 2 | digital_in | single_source | |
| OEM-2-I | Tachometer output | tacho_out | — | — | — | single_source | |
| OEM-2-K | +5V sensor supply | vref | M150-A-10 | Sensor 5.0V C1 | vref | single_source | |
| OEM-2-M | Throttle position (TPS) | analog_in | M150-C-15 | Analogue Voltage Input 2 | analog_in | single_source | |
| OEM-2-N | O2 sensor | lambda_nb_in | M150-A-11 | Lambda Narrow Input 1 | lambda_nb_in | single_source | |
| OEM-2-O | Mass air flow (MAF) | analog_in | M150-C-14 | Analogue Voltage Input 1 | analog_in | single_source | |
| OEM-2-P | Intake air temperature (IAT) | temp_in | M150-D-4 | Analogue Temperature Input 2 | temp_in | single_source | |
| OEM-2-Q | Coolant temperature (ECT) | temp_in | M150-D-3 | Analogue Temperature Input 1 | temp_in | single_source | |
| OEM-2-R | PRC solenoid (fuel pressure regulator) | low_side_out | M150-C-27 | Peak Hold Injector 5 | injector_out | single_source | |
| OEM-2-S | Condenser fan relay | low_side_out | M150-B-8 | Low Side Injector 5 | injector_out | single_source | |
| OEM-2-T | Fuel pump relay | low_side_out | M150-B-14 | Low Side Injector 6 | injector_out | single_source | |
| OEM-2-U | Injector 1 | injector_out | M150-C-19 | Peak Hold Injector 1 | injector_out | single_source | |
| OEM-2-V | Injector 2 | injector_out | M150-C-23 | Low Side Injector 1 | injector_out | single_source | |
| OEM-2-W | ISC solenoid | low_side_out | M150-C-21 | Peak Hold Injector 3 | injector_out | single_source | |
| OEM-2-X | Evap purge solenoid | low_side_out | M150-C-28 | Peak Hold Injector 6 | injector_out | single_source | |
| OEM-2-Y | Injector 3 | injector_out | M150-C-20 | Peak Hold Injector 2 | injector_out | single_source | |
| OEM-2-Z | Injector 4 | injector_out | M150-C-24 | Low Side 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 | M150-B-13 | 0.85 | no route | Battery Positive | — | |
| W3 | SP-14V-1 | M150-B-19 | 0.85 | no route | Battery Positive | — | |
| W4 | SP-14V-1 | M150-C-26 | 0.85 | no route | Battery Positive | — | |
| W5 | OEM-1-A | M150-D-12 | 0.85 | no route | Constant +12V | — | |
| W6 | OEM-2-A | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W7 | OEM-2-B | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W8 | OEM-2-C | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W9 | OEM-2-D | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W10 | SP-GND-1 | M150-A-24 | 0.85 | no route | Battery Negative 3 | — | |
| W11 | SP-GND-1 | M150-A-25 | 0.85 | no route | Battery Negative 4 | — | |
| W12 | SP-GND-1 | M150-A-32 | 0.85 | no route | Battery Negative 5 | — | |
| W13 | SP-GND-1 | M150-C-10 | 0.85 | no route | Battery Negative 1 | — | |
| W14 | SP-GND-1 | M150-C-11 | 0.85 | no route | Battery Negative 2 | — | |
| W15 | OEM-2-F | SP-0V-1 | 0.5 | no route | MAF ground | — | |
| W16 | SP-0V-1 | M150-A-26 | 0.5 | no route | Sensor 0V C1 | — | |
| W17 | SP-0V-1 | M150-A-27 | 0.5 | no route | Sensor 0V C2 | — | |
| W18 | SP-0V-1 | M150-A-33 | 0.5 | no route | Sensor 0V B1 | — | |
| W19 | SP-0V-1 | M150-A-34 | 0.5 | no route | Sensor 0V A1 | — | |
| W20 | SP-0V-1 | M150-D-15 | 0.5 | no route | Sensor 0V A | — | |
| W21 | SP-0V-1 | M150-D-16 | 0.5 | no route | Sensor 0V B | — | |
| W22 | OEM-2-K | M150-A-10 | 0.5 | no route | +5V sensor supply | — | |
| W23 | OEM-2-E | M150-D-1 | 0.5 | no route | Crank position (CAS NE) | — | |
| W24 | OEM-2-G | M150-D-2 | 0.5 | no route | Cam position (CAS G) | — | |
| W25 | OEM-1-G | M150-C-3 | 0.5 | no route | Ignition 1 (coils 1+4, wasted spark) | — | |
| W26 | OEM-1-H | M150-C-4 | 0.5 | no route | Ignition 2 (coils 2+3, wasted spark) | — | |
| W27 | OEM-2-U | M150-C-19 | 0.5 | no route | Injector 1 | — | |
| W28 | OEM-2-V | M150-C-23 | 0.5 | no route | Injector 2 | — | |
| W29 | OEM-2-Y | M150-C-20 | 0.5 | no route | Injector 3 | — | |
| W30 | OEM-2-Z | M150-C-24 | 0.5 | no route | Injector 4 | — | |
| W31 | OEM-1-J | M150-B-9 | 0.5 | no route | A/C relay | — | |
| W32 | OEM-1-R | M150-B-15 | 0.5 | no route | Cooling fan relay | — | |
| W33 | OEM-2-S | M150-B-8 | 0.5 | no route | Condenser fan relay | — | |
| W34 | OEM-2-T | M150-B-14 | 0.5 | no route | Fuel pump relay | — | |
| W35 | OEM-2-W | M150-C-21 | 0.5 | no route | ISC solenoid | — | |
| W36 | OEM-1-E | M150-C-22 | 0.5 | no route | Malfunction indicator lamp (MIL) | — | |
| W37 | OEM-2-R | M150-C-27 | 0.5 | no route | PRC solenoid (fuel pressure regulator) | — | |
| W38 | OEM-2-X | M150-C-28 | 0.5 | no route | Evap purge solenoid | — | |
| W39 | OEM-2-O | M150-C-14 | 0.5 | no route | Mass air flow (MAF) | — | |
| W40 | OEM-2-M | M150-C-15 | 0.5 | no route | Throttle position (TPS) | — | |
| W41 | OEM-2-N | M150-A-11 | 0.5 | no route | O2 sensor | — | |
| W42 | OEM-2-Q | M150-D-3 | 0.5 | no route | Coolant temperature (ECT) | — | |
| W43 | OEM-2-P | M150-D-4 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W44 | OEM-1-M | M150-D-8 | 0.5 | no route | Vehicle speed | — | |
| W45 | OEM-1-C | M150-A-23 | 0.5 | no route | Start signal | — | |
| W46 | OEM-1-P | M150-A-15 | 0.5 | no route | Power steering pressure switch | — | |
| W47 | OEM-1-Q | M150-A-16 | 0.5 | no route | A/C request | — | |
| W48 | OEM-1-V | M150-A-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 (11)
| Severity | Code | Subject | Message |
|---|---|---|---|
| warn | NET_FAMILY | OEM-2-E ↔ M150-D-1 | OEM-2-E "Crank position (CAS NE)" [trigger_in] is wired to M150-D-1 "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 ↔ M150-D-2 | OEM-2-G "Cam position (CAS G)" [trigger_in] is wired to M150-D-2 "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 ↔ M150-C-22 | OEM-1-E "Malfunction indicator lamp (MIL)" [low_side_out] is wired to M150-C-22 "Peak Hold Injector 4" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-1-J ↔ M150-B-9 | OEM-1-J "A/C relay" [low_side_out] is wired to M150-B-9 "Low Side Injector 3" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-1-R ↔ M150-B-15 | OEM-1-R "Cooling fan relay" [low_side_out] is wired to M150-B-15 "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-R ↔ M150-C-27 | OEM-2-R "PRC solenoid (fuel pressure regulator)" [low_side_out] is wired to M150-C-27 "Peak Hold Injector 5" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-2-S ↔ M150-B-8 | OEM-2-S "Condenser fan relay" [low_side_out] is wired to M150-B-8 "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-T ↔ M150-B-14 | OEM-2-T "Fuel pump relay" [low_side_out] is wired to M150-B-14 "Low Side Injector 6" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-2-W ↔ M150-C-21 | OEM-2-W "ISC solenoid" [low_side_out] is wired to M150-C-21 "Peak Hold Injector 3" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-2-X ↔ M150-C-28 | OEM-2-X "Evap purge solenoid" [low_side_out] is wired to M150-C-28 "Peak Hold 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 (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 M150
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 |