MX-5 Miata NB1 1999-00 (BP-4W) → MoTeC M170 13170 (auto)
MX-5 Miata NB1 1999-00 (BP-4W) — MoTeC — M170
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 | 54 wires · 7 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 | M170-A-23 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | SP-14V-1 | M170-A-32 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | SP-14V-1 | M170-A-41 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-1-A | M170-A-54 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-3-A | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | OEM-3-B | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-3-C | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-GND-1 | M170-A-14 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-GND-1 | M170-A-15 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | SP-GND-1 | M170-A-19 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | SP-GND-1 | M170-A-20 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | SP-GND-1 | M170-A-21 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-3-F | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | SP-0V-1 | M170-A-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | SP-0V-1 | M170-A-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-2-I | M170-A-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-2-J | M170-A-49 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-2-H | M170-A-56 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-2-F | M170-A-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-3-G | M170-A-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-3-H | M170-A-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-3-W | M170-A-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-3-X | M170-A-43 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-3-Y | M170-A-50 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-3-Z | M170-A-51 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-1-I | M170-A-63 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-1-R | M170-A-66 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-1-S | M170-A-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-3-N | M170-A-42 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-1-U | M170-A-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-3-V | M170-A-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-3-O | M170-A-57 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-1-E | M170-A-62 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-1-O | M170-A-59 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-1-Q | M170-A-65 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-2-M | M170-A-58 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-2-N | M170-A-64 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-2-L | M170-A-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-3-E | M170-A-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-2-C | M170-A-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-3-J | M170-A-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-2-E | M170-A-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-2-B | M170-A-38 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-2-A | M170-A-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-3-K | M170-A-36 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | OEM-3-S | M170-A-35 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W49 | OEM-2-D | M170-A-46 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W50 | OEM-1-F | M170-A-45 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W51 | OEM-1-G | M170-A-52 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W52 | OEM-1-P | M170-A-53 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W53 | OEM-1-V | M170-A-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W54 | OEM-3-I | M170-A-22 | 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 | M170-A-16 | M170-A-11 | open (OL) | 5 V sensor reference must not touch sensor ground | |
| 2 | M170-A-16 | M170-A-14 | open (OL) | 5 V sensor reference must not touch power ground | |
| 3 | M170-A-23 | M170-A-11 | open (OL) | +12 V supply must not touch sensor ground | |
| 4 | M170-A-23 | M170-A-14 | open (OL) | +12 V supply must not touch power ground | |
| 5 | M170-A-54 | M170-A-11 | open (OL) | +12 V supply must not touch sensor ground | |
| 6 | M170-A-54 | M170-A-14 | open (OL) | +12 V supply must not touch power ground | |
| 7 | M170-A-23 | M170-A-16 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 8 | M170-A-54 | M170-A-16 | open (OL) | +12 V supply must not touch 5 V sensor reference |
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
M170-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Low Side Ignition 1 | — | W22 | — | 0.5 | OEM-3-G | — | — | — |
| 10 | Low Side Ignition 4 | — | — | — | — | — | — | — | — |
| 11 | Sensor 0V A | — | W16 | — | 0.5 | SP-0V-1 | — | — | — |
| 12 | Analogue Voltage Input 5 | — | W46 | — | 0.5 | OEM-2-A | — | — | — |
| 13 | Universal Digital Input 7 | — | W53 | — | 0.5 | OEM-1-V | — | — | — |
| 14 | Battery Negative 1 | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
| 15 | Battery Negative 2 | — | W11 | — | 0.85 | SP-GND-1 | — | — | — |
| 16 | Sensor 5.0V A | — | W18 | — | 0.5 | OEM-2-I | — | — | — |
| 17 | Low Side Ignition 5 | — | — | — | — | — | — | — | — |
| 18 | Analogue Voltage Input 2 | — | W41 | — | 0.5 | OEM-3-E | — | — | — |
| 19 | Battery Negative 3 | — | W12 | — | 0.85 | SP-GND-1 | — | — | — |
| 2 | Low Side Ignition 8 | — | — | — | — | — | — | — | — |
| 20 | Battery Negative 4 | — | W13 | — | 0.85 | SP-GND-1 | — | — | — |
| 21 | Battery Negative 5 | — | W14 | — | 0.85 | SP-GND-1 | — | — | — |
| 22 | Universal Digital Input 8 | — | W54 | — | 0.5 | OEM-3-I | — | — | — |
| 23 | Battery Positive | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 24 | Peak Hold Injector 5 | — | W30 | — | 0.5 | OEM-1-S | — | — | — |
| 25 | Low Side Ignition 6 | — | — | — | — | — | — | — | — |
| 26 | Analogue Voltage Input 1 | — | W40 | — | 0.5 | OEM-2-L | — | — | — |
| 27 | Sensor 0V B | — | W17 | — | 0.5 | SP-0V-1 | — | — | — |
| 28 | Analogue Temperature Input 1 | — | W44 | — | 0.5 | OEM-2-E | — | — | — |
| 29 | Knock Input 1 | — | W21 | — | 0.5 | OEM-2-F | — | — | — |
| 3 | Low Side Ignition 7 | — | — | — | — | — | — | — | — |
| 30 | Analogue Temperature Input 3 | — | — | — | — | — | — | — | — |
| 31 | CAN Bus 1 Low | — | — | — | — | — | — | — | — |
| 32 | Battery Positive | — | W4 | — | 0.85 | SP-14V-1 | — | — | — |
| 33 | Peak Hold Injector 1 | — | W24 | — | 0.5 | OEM-3-W | — | — | — |
| 34 | Sensor 5.0V B | — | — | — | — | — | — | — | — |
| 35 | Analogue Voltage Input 7 | — | W48 | — | 0.5 | OEM-3-S | — | — | — |
| 36 | Analogue Voltage Input 6 | — | W47 | — | 0.5 | OEM-3-K | — | — | — |
| 37 | Sensor 6.3V | — | — | — | — | — | — | — | — |
| 38 | Analogue Temperature Input 2 | — | W45 | — | 0.5 | OEM-2-B | — | — | — |
| 39 | Analogue Temperature Input 4 | — | — | — | — | — | — | — | — |
| 4 | Low Side Ignition 3 | — | — | — | — | — | — | — | — |
| 40 | CAN Bus 1 High | — | — | — | — | — | — | — | — |
| 41 | Battery Positive | — | W5 | — | 0.85 | SP-14V-1 | — | — | — |
| 42 | Peak Hold Injector 6 | — | W31 | — | 0.5 | OEM-3-N | — | — | — |
| 43 | Low Side Injector 1 | — | W25 | — | 0.5 | OEM-3-X | — | — | — |
| 44 | Analogue Voltage Input 8 | — | — | — | — | — | — | — | — |
| 45 | Universal Digital Input 4 | — | W50 | — | 0.5 | OEM-1-F | — | — | — |
| 46 | Universal Digital Input 3 | — | W49 | — | 0.5 | OEM-2-D | — | — | — |
| 47 | Ethernet Transmit - | — | — | — | — | — | — | — | — |
| 48 | Ethernet Transmit + | — | — | — | — | — | — | — | — |
| 49 | Universal Digital Input 1 | — | W19 | — | 0.5 | OEM-2-J | — | — | — |
| 5 | Low Side Ignition 2 | — | W23 | — | 0.5 | OEM-3-H | — | — | — |
| 50 | Peak Hold Injector 2 | — | W26 | — | 0.5 | OEM-3-Y | — | — | — |
| 51 | Low Side Injector 2 | — | W27 | — | 0.5 | OEM-3-Z | — | — | — |
| 52 | Universal Digital Input 5 | — | W51 | — | 0.5 | OEM-1-G | — | — | — |
| 53 | Universal Digital Input 6 | — | W52 | — | 0.5 | OEM-1-P | — | — | — |
| 54 | Battery Backup | — | W6 | — | 0.85 | OEM-1-A | — | — | — |
| 55 | Ethernet Receive + | — | — | — | — | — | — | — | — |
| 56 | Universal Digital Input 2 | — | W20 | — | 0.5 | OEM-2-H | — | — | — |
| 57 | Peak Hold Injector 7 | — | W34 | — | 0.5 | OEM-3-O | — | — | — |
| 58 | Half Bridge Output 5 | — | W38 | — | 0.5 | OEM-2-M | — | — | — |
| 59 | Half Bridge Output 3 | — | W36 | — | 0.5 | OEM-1-O | — | — | — |
| 6 | Analogue Voltage Input 3 | — | W42 | — | 0.5 | OEM-2-C | — | — | — |
| 60 | Knock Input 2 | — | — | — | — | — | — | — | — |
| 61 | Ethernet Receive - | — | — | — | — | — | — | — | — |
| 62 | Peak Hold Injector 8 | — | W35 | — | 0.5 | OEM-1-E | — | — | — |
| 63 | Peak Hold Injector 3 | — | W28 | — | 0.5 | OEM-1-I | — | — | — |
| 64 | Half Bridge Output 6 | — | W39 | — | 0.5 | OEM-2-N | — | — | — |
| 65 | Half Bridge Output 4 | — | W37 | — | 0.5 | OEM-1-Q | — | — | — |
| 66 | Peak Hold Injector 4 | — | W29 | — | 0.5 | OEM-1-R | — | — | — |
| 7 | Analogue Voltage Input 4 | — | W43 | — | 0.5 | OEM-3-J | — | — | — |
| 8 | Half Bridge Output 2 | — | W33 | — | 0.5 | OEM-3-V | — | — | — |
| 9 | Half Bridge Output 1 | — | W32 | — | 0.5 | OEM-1-U | — | — | — |
OEM-1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Constant +12V | — | W6 | — | 0.85 | M170-A-54 | — | — | — |
| B | ECU power +14V (main relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| E | Malfunction indicator lamp (MIL) | — | W35 | — | 0.5 | M170-A-62 | — | — | — |
| F | Brake switch | — | W50 | — | 0.5 | M170-A-45 | — | — | — |
| G | Power steering pressure switch | — | W51 | — | 0.5 | M170-A-52 | — | — | — |
| I | Condenser fan relay | — | W28 | — | 0.5 | M170-A-63 | — | — | — |
| O | Alternator control | — | W36 | — | 0.5 | M170-A-59 | — | — | — |
| P | A/C request | — | W52 | — | 0.5 | M170-A-53 | — | — | — |
| Q | Charge lamp | — | W37 | — | 0.5 | M170-A-65 | — | — | — |
| R | Cooling fan relay | — | W29 | — | 0.5 | M170-A-66 | — | — | — |
| S | A/C clutch relay | — | W30 | — | 0.5 | M170-A-24 | — | — | — |
| U | Front O2 heater | — | W32 | — | 0.5 | M170-A-9 | — | — | — |
| V | Neutral switch | — | W53 | — | 0.5 | M170-A-13 | — | — | — |
OEM-2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Fuel tank pressure | — | W46 | — | 0.5 | M170-A-12 | — | — | — |
| B | Intake air temperature (IAT) | — | W45 | — | 0.5 | M170-A-38 | — | — | — |
| C | Front O2 signal | — | W42 | — | 0.5 | M170-A-6 | — | — | — |
| D | Vehicle speed | — | W49 | — | 0.5 | M170-A-46 | — | — | — |
| E | Coolant temperature (ECT) | — | W44 | — | 0.5 | M170-A-28 | — | — | — |
| F | Knock sensor | — | W21 | — | 0.5 | M170-A-29 | — | — | — |
| H | Cam position (CMP) | — | W20 | — | 0.5 | M170-A-56 | — | — | — |
| I | +5V sensor supply | — | W18 | — | 0.5 | M170-A-16 | — | — | — |
| J | Crank position (CKP) | — | W19 | — | 0.5 | M170-A-49 | — | — | — |
| K | Tachometer output | — | — | — | — | — | — | — | — |
| L | Mass air flow (MAF) | — | W40 | — | 0.5 | M170-A-26 | — | — | — |
| M | EGR valve | — | W38 | — | 0.5 | M170-A-58 | — | — | — |
| N | EGR valve | — | W39 | — | 0.5 | M170-A-64 | — | — | — |
| O | EGR valve | — | — | — | — | — | — | — | — |
| P | EGR valve | — | — | — | — | — | — | — | — |
OEM-3
| 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 | — | — | — |
| E | Throttle position (TPS) | — | W41 | — | 0.5 | M170-A-18 | — | — | — |
| F | Signal ground | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| G | Ignition 1 (coils 1+4, wasted spark) | — | W22 | — | 0.5 | M170-A-1 | — | — | — |
| H | Ignition 2 (coils 2+3, wasted spark) | — | W23 | — | 0.5 | M170-A-5 | — | — | — |
| I | Clutch switch | — | W54 | — | 0.5 | M170-A-22 | — | — | — |
| J | Rear O2 signal | — | W43 | — | 0.5 | M170-A-7 | — | — | — |
| K | Fuel level | — | W47 | — | 0.5 | M170-A-36 | — | — | — |
| L | Evap purge solenoid | — | — | — | — | — | — | — | — |
| M | ISC valve +14V feed | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| N | Fuel pump relay | — | W31 | — | 0.5 | M170-A-42 | — | — | — |
| O | ISC valve low side | — | W34 | — | 0.5 | M170-A-57 | — | — | — |
| Q | VICS solenoid (intake butterflies) | — | — | — | — | — | — | — | — |
| S | EGR boost sensor | — | W48 | — | 0.5 | M170-A-35 | — | — | — |
| T | EGR boost solenoid | — | — | — | — | — | — | — | — |
| U | Canister drain cut valve (CDCV) | — | — | — | — | — | — | — | — |
| V | Rear O2 heater | — | W33 | — | 0.5 | M170-A-8 | — | — | — |
| W | Injector 1 | — | W24 | — | 0.5 | M170-A-33 | — | — | — |
| X | Injector 2 | — | W25 | — | 0.5 | M170-A-43 | — | — | — |
| Y | Injector 3 | — | W26 | — | 0.5 | M170-A-50 | — | — | — |
| Z | Injector 4 | — | W27 | — | 0.5 | M170-A-51 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W15 | — | 0.5 | OEM-3-F | — | — | — |
| 1 | — | — | W16 | — | 0.5 | M170-A-11 | — | — | — |
| 1 | — | — | W17 | — | 0.5 | M170-A-27 | — | — | — |
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 | M170-A-23 | — | — | — |
| 1 | — | — | W4 | — | 0.85 | M170-A-32 | — | — | — |
| 1 | — | — | W5 | — | 0.85 | M170-A-41 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W7 | — | 0.85 | OEM-3-A | — | — | — |
| 1 | — | — | W8 | — | 0.85 | OEM-3-B | — | — | — |
| 1 | — | — | W9 | — | 0.85 | OEM-3-C | — | — | — |
| 1 | — | — | W10 | — | 0.85 | M170-A-14 | — | — | — |
| 1 | — | — | W11 | — | 0.85 | M170-A-15 | — | — | — |
| 1 | — | — | W12 | — | 0.85 | M170-A-19 | — | — | — |
| 1 | — | — | W13 | — | 0.85 | M170-A-20 | — | — | — |
| 1 | — | — | W14 | — | 0.85 | M170-A-21 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-1-A | Constant +12V | power_in | M170-A-54 | Battery Backup | power_in | single_source | |
| OEM-1-B | ECU power +14V (main relay) | power_in | M170-A-23 + M170-A-32 + M170-A-41 | Battery Positive + Battery Positive + Battery Positive | power_in | single_source | |
| OEM-1-E | Malfunction indicator lamp (MIL) | low_side_out | M170-A-62 | Peak Hold Injector 8 | injector_out | single_source | |
| OEM-1-F | Brake switch | digital_in | M170-A-45 | Universal Digital Input 4 | digital_in | single_source | |
| OEM-1-G | Power steering pressure switch | digital_in | M170-A-52 | Universal Digital Input 5 | digital_in | single_source | |
| OEM-1-I | Condenser fan relay | low_side_out | M170-A-63 | Peak Hold Injector 3 | injector_out | single_source | |
| OEM-1-O | Alternator control | low_side_out | M170-A-59 | Half Bridge Output 3 | hbridge_out | single_source | |
| OEM-1-P | A/C request | digital_in | M170-A-53 | Universal Digital Input 6 | digital_in | single_source | |
| OEM-1-Q | Charge lamp | low_side_out | M170-A-65 | Half Bridge Output 4 | hbridge_out | single_source | |
| OEM-1-R | Cooling fan relay | low_side_out | M170-A-66 | Peak Hold Injector 4 | injector_out | single_source | |
| OEM-1-S | A/C clutch relay | low_side_out | M170-A-24 | Peak Hold Injector 5 | injector_out | single_source | |
| OEM-1-U | Front O2 heater | low_side_out | M170-A-9 | Half Bridge Output 1 | hbridge_out | single_source | |
| OEM-1-V | Neutral switch | digital_in | M170-A-13 | Universal Digital Input 7 | digital_in | single_source | |
| OEM-2-A | Fuel tank pressure | analog_in | M170-A-12 | Analogue Voltage Input 5 | analog_in | single_source | |
| OEM-2-B | Intake air temperature (IAT) | temp_in | M170-A-38 | Analogue Temperature Input 2 | temp_in | single_source | |
| OEM-2-C | Front O2 signal | lambda_nb_in | M170-A-6 | Analogue Voltage Input 3 | analog_in | single_source | |
| OEM-2-D | Vehicle speed | digital_in | M170-A-46 | Universal Digital Input 3 | digital_in | single_source | |
| OEM-2-E | Coolant temperature (ECT) | temp_in | M170-A-28 | Analogue Temperature Input 1 | temp_in | single_source | |
| OEM-2-F | Knock sensor | knock_in | M170-A-29 | Knock Input 1 | knock_in | single_source | |
| OEM-2-H | Cam position (CMP) | trigger_in | M170-A-56 | Universal Digital Input 2 | digital_in | single_source | |
| OEM-2-I | +5V sensor supply | vref | M170-A-16 | Sensor 5.0V A | vref | single_source | |
| OEM-2-J | Crank position (CKP) | trigger_in | M170-A-49 | Universal Digital Input 1 | digital_in | single_source | |
| OEM-2-K | Tachometer output | tacho_out | — | — | — | single_source | |
| OEM-2-L | Mass air flow (MAF) | analog_in | M170-A-26 | Analogue Voltage Input 1 | analog_in | single_source | |
| OEM-2-M | EGR valve | low_side_out | M170-A-58 | Half Bridge Output 5 | hbridge_out | single_source | |
| OEM-2-N | EGR valve | low_side_out | M170-A-64 | Half Bridge Output 6 | hbridge_out | single_source | |
| OEM-2-O | EGR valve | low_side_out | — | — | — | single_source | |
| OEM-2-P | EGR valve | low_side_out | — | — | — | single_source | |
| OEM-3-A | Power ground | ground | M170-A-14 + M170-A-15 + M170-A-19 + M170-A-20 + M170-A-21 | Battery Negative 1 + Battery Negative 2 + Battery Negative 3 + Battery Negative 4 + Battery Negative 5 | ground | single_source | |
| OEM-3-B | Power ground | ground | M170-A-14 + M170-A-15 + M170-A-19 + M170-A-20 + M170-A-21 | Battery Negative 1 + Battery Negative 2 + Battery Negative 3 + Battery Negative 4 + Battery Negative 5 | ground | single_source | |
| OEM-3-C | Power ground | ground | M170-A-14 + M170-A-15 + M170-A-19 + M170-A-20 + M170-A-21 | Battery Negative 1 + Battery Negative 2 + Battery Negative 3 + Battery Negative 4 + Battery Negative 5 | ground | single_source | |
| OEM-3-E | Throttle position (TPS) | analog_in | M170-A-18 | Analogue Voltage Input 2 | analog_in | single_source | |
| OEM-3-F | Signal ground | sensor_ground | M170-A-11 + M170-A-27 | Sensor 0V A + Sensor 0V B | sensor_ground | single_source | |
| OEM-3-G | Ignition 1 (coils 1+4, wasted spark) | ignition_out | M170-A-1 | Low Side Ignition 1 | ignition_out | single_source | |
| OEM-3-H | Ignition 2 (coils 2+3, wasted spark) | ignition_out | M170-A-5 | Low Side Ignition 2 | ignition_out | single_source | |
| OEM-3-I | Clutch switch | digital_in | M170-A-22 | Universal Digital Input 8 | digital_in | single_source | |
| OEM-3-J | Rear O2 signal | lambda_nb_in | M170-A-7 | Analogue Voltage Input 4 | analog_in | single_source | |
| OEM-3-K | Fuel level | analog_in | M170-A-36 | Analogue Voltage Input 6 | analog_in | single_source | |
| OEM-3-L | Evap purge solenoid | low_side_out | — | — | — | single_source | |
| OEM-3-M | ISC valve +14V feed | power_in | M170-A-23 + M170-A-32 + M170-A-41 | Battery Positive + Battery Positive + Battery Positive | power_in | single_source | |
| OEM-3-N | Fuel pump relay | low_side_out | M170-A-42 | Peak Hold Injector 6 | injector_out | single_source | |
| OEM-3-O | ISC valve low side | low_side_out | M170-A-57 | Peak Hold Injector 7 | injector_out | single_source | |
| OEM-3-Q | VICS solenoid (intake butterflies) | low_side_out | — | — | — | single_source | |
| OEM-3-S | EGR boost sensor | analog_in | M170-A-35 | Analogue Voltage Input 7 | 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 | M170-A-8 | Half Bridge Output 2 | hbridge_out | single_source | |
| OEM-3-W | Injector 1 | injector_out | M170-A-33 | Peak Hold Injector 1 | injector_out | single_source | |
| OEM-3-X | Injector 2 | injector_out | M170-A-43 | Low Side Injector 1 | injector_out | single_source | |
| OEM-3-Y | Injector 3 | injector_out | M170-A-50 | Peak Hold Injector 2 | injector_out | single_source | |
| OEM-3-Z | Injector 4 | injector_out | M170-A-51 | 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 | OEM-3-M | SP-14V-1 | 0.85 | no route | ISC valve +14V feed | — | |
| W3 | SP-14V-1 | M170-A-23 | 0.85 | no route | Battery Positive | — | |
| W4 | SP-14V-1 | M170-A-32 | 0.85 | no route | Battery Positive | — | |
| W5 | SP-14V-1 | M170-A-41 | 0.85 | no route | Battery Positive | — | |
| W6 | OEM-1-A | M170-A-54 | 0.85 | no route | Constant +12V | — | |
| W7 | OEM-3-A | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W8 | OEM-3-B | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W9 | OEM-3-C | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W10 | SP-GND-1 | M170-A-14 | 0.85 | no route | Battery Negative 1 | — | |
| W11 | SP-GND-1 | M170-A-15 | 0.85 | no route | Battery Negative 2 | — | |
| W12 | SP-GND-1 | M170-A-19 | 0.85 | no route | Battery Negative 3 | — | |
| W13 | SP-GND-1 | M170-A-20 | 0.85 | no route | Battery Negative 4 | — | |
| W14 | SP-GND-1 | M170-A-21 | 0.85 | no route | Battery Negative 5 | — | |
| W15 | OEM-3-F | SP-0V-1 | 0.5 | no route | Signal ground | — | |
| W16 | SP-0V-1 | M170-A-11 | 0.5 | no route | Sensor 0V A | — | |
| W17 | SP-0V-1 | M170-A-27 | 0.5 | no route | Sensor 0V B | — | |
| W18 | OEM-2-I | M170-A-16 | 0.5 | no route | +5V sensor supply | — | |
| W19 | OEM-2-J | M170-A-49 | 0.5 | no route | Crank position (CKP) | — | |
| W20 | OEM-2-H | M170-A-56 | 0.5 | no route | Cam position (CMP) | — | |
| W21 | OEM-2-F | M170-A-29 | 0.5 | no route | Knock sensor | — | |
| W22 | OEM-3-G | M170-A-1 | 0.5 | no route | Ignition 1 (coils 1+4, wasted spark) | — | |
| W23 | OEM-3-H | M170-A-5 | 0.5 | no route | Ignition 2 (coils 2+3, wasted spark) | — | |
| W24 | OEM-3-W | M170-A-33 | 0.5 | no route | Injector 1 | — | |
| W25 | OEM-3-X | M170-A-43 | 0.5 | no route | Injector 2 | — | |
| W26 | OEM-3-Y | M170-A-50 | 0.5 | no route | Injector 3 | — | |
| W27 | OEM-3-Z | M170-A-51 | 0.5 | no route | Injector 4 | — | |
| W28 | OEM-1-I | M170-A-63 | 0.5 | no route | Condenser fan relay | — | |
| W29 | OEM-1-R | M170-A-66 | 0.5 | no route | Cooling fan relay | — | |
| W30 | OEM-1-S | M170-A-24 | 0.5 | no route | A/C clutch relay | — | |
| W31 | OEM-3-N | M170-A-42 | 0.5 | no route | Fuel pump relay | — | |
| W32 | OEM-1-U | M170-A-9 | 0.5 | no route | Front O2 heater | — | |
| W33 | OEM-3-V | M170-A-8 | 0.5 | no route | Rear O2 heater | — | |
| W34 | OEM-3-O | M170-A-57 | 0.5 | no route | ISC valve low side | — | |
| W35 | OEM-1-E | M170-A-62 | 0.5 | no route | Malfunction indicator lamp (MIL) | — | |
| W36 | OEM-1-O | M170-A-59 | 0.5 | no route | Alternator control | — | |
| W37 | OEM-1-Q | M170-A-65 | 0.5 | no route | Charge lamp | — | |
| W38 | OEM-2-M | M170-A-58 | 0.5 | no route | EGR valve | — | |
| W39 | OEM-2-N | M170-A-64 | 0.5 | no route | EGR valve | — | |
| W40 | OEM-2-L | M170-A-26 | 0.5 | no route | Mass air flow (MAF) | — | |
| W41 | OEM-3-E | M170-A-18 | 0.5 | no route | Throttle position (TPS) | — | |
| W42 | OEM-2-C | M170-A-6 | 0.5 | no route | Front O2 signal | — | |
| W43 | OEM-3-J | M170-A-7 | 0.5 | no route | Rear O2 signal | — | |
| W44 | OEM-2-E | M170-A-28 | 0.5 | no route | Coolant temperature (ECT) | — | |
| W45 | OEM-2-B | M170-A-38 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W46 | OEM-2-A | M170-A-12 | 0.5 | no route | Fuel tank pressure | — | |
| W47 | OEM-3-K | M170-A-36 | 0.5 | no route | Fuel level | — | |
| W48 | OEM-3-S | M170-A-35 | 0.5 | no route | EGR boost sensor | — | |
| W49 | OEM-2-D | M170-A-46 | 0.5 | no route | Vehicle speed | — | |
| W50 | OEM-1-F | M170-A-45 | 0.5 | no route | Brake switch | — | |
| W51 | OEM-1-G | M170-A-52 | 0.5 | no route | Power steering pressure switch | — | |
| W52 | OEM-1-P | M170-A-53 | 0.5 | no route | A/C request | — | |
| W53 | OEM-1-V | M170-A-13 | 0.5 | no route | Neutral switch | — | |
| W54 | OEM-3-I | M170-A-22 | 0.5 | no route | Clutch 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 (15)
| Severity | Code | Subject | Message |
|---|---|---|---|
| warn | NET_FAMILY | OEM-1-O ↔ M170-A-59 | OEM-1-O "Alternator control" [low_side_out] is wired to M170-A-59 "Half Bridge Output 3" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way. |
| warn | NET_FAMILY | OEM-1-Q ↔ M170-A-65 | OEM-1-Q "Charge lamp" [low_side_out] is wired to M170-A-65 "Half Bridge Output 4" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way. |
| warn | NET_FAMILY | OEM-1-U ↔ M170-A-9 | OEM-1-U "Front O2 heater" [low_side_out] is wired to M170-A-9 "Half Bridge Output 1" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way. |
| warn | NET_FAMILY | OEM-2-H ↔ M170-A-56 | OEM-2-H "Cam position (CMP)" [trigger_in] is wired to M170-A-56 "Universal Digital Input 2" [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-J ↔ M170-A-49 | OEM-2-J "Crank position (CKP)" [trigger_in] is wired to M170-A-49 "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-M ↔ M170-A-58 | OEM-2-M "EGR valve" [low_side_out] is wired to M170-A-58 "Half Bridge Output 5" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way. |
| warn | NET_FAMILY | OEM-2-N ↔ M170-A-64 | OEM-2-N "EGR valve" [low_side_out] is wired to M170-A-64 "Half Bridge Output 6" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way. |
| warn | NET_FAMILY | OEM-3-V ↔ M170-A-8 | OEM-3-V "Rear O2 heater" [low_side_out] is wired to M170-A-8 "Half Bridge Output 2" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way. |
| info | NET_FAMILY | OEM-1-E ↔ M170-A-62 | OEM-1-E "Malfunction indicator lamp (MIL)" [low_side_out] is wired to M170-A-62 "Peak Hold Injector 8" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-1-I ↔ M170-A-63 | OEM-1-I "Condenser fan relay" [low_side_out] is wired to M170-A-63 "Peak Hold Injector 3" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-1-R ↔ M170-A-66 | OEM-1-R "Cooling fan relay" [low_side_out] is wired to M170-A-66 "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-S ↔ M170-A-24 | OEM-1-S "A/C clutch relay" [low_side_out] is wired to M170-A-24 "Peak Hold Injector 5" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-3-N ↔ M170-A-42 | OEM-3-N "Fuel pump relay" [low_side_out] is wired to M170-A-42 "Peak Hold Injector 6" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-3-O ↔ M170-A-57 | OEM-3-O "ISC valve low side" [low_side_out] is wired to M170-A-57 "Peak Hold Injector 7" [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-O EGR valve; OEM-2-P EGR valve; 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 (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 O: EGR valve: no free low_side/ls_hs/injector/hbridge on MoTeC M170 - OEM-2 P: EGR valve: no free low_side/ls_hs/injector/hbridge on MoTeC M170 - OEM-3 L: Evap purge solenoid: no free low_side/ls_hs/injector/hbridge on MoTeC M170 - OEM-3 Q: VICS solenoid (intake butterflies): no free low_side/ls_hs/injector/hbridge on MoTeC M170 - OEM-3 T: EGR boost solenoid: no free low_side/ls_hs/injector/hbridge on MoTeC M170 - OEM-3 U: Canister drain cut valve (CDCV): no free low_side/ls_hs/injector/hbridge on MoTeC M170 - OEM-2 K: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on MoTeC M170
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | Link G4X MX5NB1X install manual (NB1 1999-00) | https://linkecu.com/documentation/MX5XNB1.pdf | archive | 2026-10-05 | 2e36c91270cc |
| 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 |