MX-5 Miata NA8 1994-97 (BP-ZE, 1.8) → MoTeC M800 universal (auto)
MX-5 Miata NA8 1994-97 (BP-ZE, 1.8) — MoTeC — M800
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 | 39 wires · 7 connectors · 5 part lines |
| Tools | Crimp and extraction tools for each terminal family (see Connectors) · wire strippers · multimeter · heat gun + heat-shrink |
| Terminals | 3-1447221-4 |
| Order of work | 1. Check every part against the parts list. 2. Cut and label every wire (labels: Export → Wire labels). 3. Crimp and pin connector by connector, ticking the build checklist. 4. Run the bench test with nothing plugged in and the battery disconnected. 5. Only then connect the ECU and power up. |
Build checklist
Tick each box as you go. Continuity: meter from end to end, expect under 1 Ω.
| Wire | From | To | Gauge | Colour | Cut | Label | Crimp A | Crimp B | Pin A | Pin B | Continuity |
|---|---|---|---|---|---|---|---|---|---|---|---|
| W1 | OEM-1-B | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | SP-14V-1 | M800-A-26 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | OEM-2-A | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-2-B | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-2-C | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-2-D | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | SP-GND-1 | M800-A-10 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | M800-A-11 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-2-F | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-0V-1 | M800-B-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-0V-1 | M800-B-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | SP-0V-1 | M800-B-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-2-K | M800-A-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-2-E | M800-B-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-2-G | M800-B-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-1-G | M800-A-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-1-H | M800-A-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-2-U | M800-A-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-2-V | M800-A-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-2-Y | M800-A-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-2-Z | M800-A-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-1-J | M800-A-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-1-R | M800-A-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-2-S | M800-A-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-2-T | M800-A-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-2-W | M800-A-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-1-E | M800-A-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-2-R | M800-A-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-2-X | M800-A-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-2-O | M800-A-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-2-M | M800-A-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-2-N | M800-A-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-2-Q | M800-B-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-2-P | M800-B-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-1-M | M800-B-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-1-C | M800-B-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-1-P | M800-B-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-1-Q | M800-B-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-1-V | M800-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 | M800-A-26 | M800-A-10 | open (OL) | +12 V supply must not touch power ground | |
| 2 | M800-A-26 | M800-B-14 | open (OL) | +12 V supply must not touch sensor ground | |
| 3 | M800-A-10 | M800-A-2 | open (OL) | power ground must not touch 5 V sensor reference | |
| 4 | M800-A-26 | M800-A-2 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 5 | M800-B-14 | M800-A-2 | open (OL) | sensor ground must not touch 5 V sensor reference |
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
M800-A
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | AUX2 | — | W23 | — | 0.5 | OEM-1-R | — | — | — |
| 2 | 5V Engine Sensor Supply | — | W13 | — | 0.5 | OEM-2-K | — | — | — |
| 3 | IGN1 | — | W16 | — | 0.5 | OEM-1-G | — | — | — |
| 4 | IGN2 | — | W17 | — | 0.5 | OEM-1-H | — | — | — |
| 5 | IGN3 | — | — | — | — | — | — | — | — |
| 6 | IGN4 | — | — | — | — | — | — | — | — |
| 7 | IGN5 | — | — | — | — | — | — | — | — |
| 8 | IGN6 | — | — | — | — | — | — | — | — |
| 9 | 5V Auxiliary Sensor Supply | — | — | — | — | — | — | — | — |
| 10 | GND Battery Negative | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 11 | GND Battery Negative | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 12 | 8V Engine Sensor Supply | — | — | — | — | — | — | — | — |
| 13 | 8V Auxiliary Sensor and CAN Supply | — | — | — | — | — | — | — | — |
| 14 | AV1 | — | W30 | — | 0.5 | OEM-2-O | — | — | — |
| 15 | Analog Voltage Input 2 | — | W31 | — | 0.5 | OEM-2-M | — | — | — |
| 16 | Analog Voltage Input 3 | — | W32 | — | 0.5 | OEM-2-N | — | — | — |
| 17 | Analog Voltage Input 4 | — | W39 | — | 0.5 | OEM-1-V | — | — | — |
| 18 | AUX1 | — | W22 | — | 0.5 | OEM-1-J | — | — | — |
| 19 | INJ1 | — | W18 | — | 0.5 | OEM-2-U | — | — | — |
| 20 | INJ2 | — | W19 | — | 0.5 | OEM-2-V | — | — | — |
| 21 | INJ3 | — | W20 | — | 0.5 | OEM-2-Y | — | — | — |
| 22 | INJ4 | — | W21 | — | 0.5 | OEM-2-Z | — | — | — |
| 23 | AUX3 | — | W24 | — | 0.5 | OEM-2-S | — | — | — |
| 24 | AUX4 | — | W25 | — | 0.5 | OEM-2-T | — | — | — |
| 25 | Analog Voltage Input 5 | — | — | — | — | — | — | — | — |
| 26 | VBAT Battery Positive | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 27 | INJ5 | — | — | — | — | — | — | — | — |
| 28 | INJ6 | — | — | — | — | — | — | — | — |
| 29 | INJ7 | — | — | — | — | — | — | — | — |
| 30 | INJ8 | — | — | — | — | — | — | — | — |
| 31 | AUX5 | — | W26 | — | 0.5 | OEM-2-W | — | — | — |
| 32 | AUX6 | — | W27 | — | 0.5 | OEM-1-E | — | — | — |
| 33 | AUX7 | — | W28 | — | 0.5 | OEM-2-R | — | — | — |
| 34 | AUX8 | — | W29 | — | 0.5 | OEM-2-X | — | — | — |
M800-B
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Crank Reference Timing Input | — | W14 | — | 0.5 | OEM-2-E | — | — | — |
| 2 | Cam Sync Timing Input | — | W15 | — | 0.5 | OEM-2-G | — | — | — |
| 3 | Analog Temperature Input 1 | — | W33 | — | 0.5 | OEM-2-Q | — | — | — |
| 4 | Analog Temperature Input 2 | — | W34 | — | 0.5 | OEM-2-P | — | — | — |
| 5 | Analog Temperature Input 3 | — | — | — | — | — | — | — | — |
| 6 | Analog Temperature Input 4 | — | — | — | — | — | — | — | — |
| 7 | Analog Temperature Input 5 | — | — | — | — | — | — | — | — |
| 8 | Digital Input 1 | — | W35 | — | 0.5 | OEM-1-M | — | — | — |
| 9 | Digital Input 2 | — | W36 | — | 0.5 | OEM-1-C | — | — | — |
| 10 | Digital Input 3 | — | W37 | — | 0.5 | OEM-1-P | — | — | — |
| 11 | Digital Input 4 | — | W38 | — | 0.5 | OEM-1-Q | — | — | — |
| 12 | Lambda2 Sense Voltage | — | — | — | — | — | — | — | — |
| 13 | Lambda2 Pump Current | — | — | — | — | — | — | — | — |
| 14 | 0V Comms Reference | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| 15 | 0V Auxiliary Sensor Supply | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| 16 | 0V Engine Sensor Supply | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 17 | RS232 Transmit Data | — | — | — | — | — | — | — | — |
| 18 | RS232 Receive Data | — | — | — | — | — | — | — | — |
| 19 | Analog Temperature Input 6 | — | — | — | — | — | — | — | — |
| 20 | Analog Voltage Input 6 | — | — | — | — | — | — | — | — |
| 21 | AV7 | — | — | — | — | — | — | — | — |
| 22 | AV8 | — | — | — | — | — | — | — | — |
| 23 | CAN Bus High | — | — | — | — | — | — | — | — |
| 24 | CAN Bus Low | — | — | — | — | — | — | — | — |
| 25 | Lambda1 Sense Voltage | — | — | — | — | — | — | — | — |
| 26 | Lambda1 Pump Current | — | — | — | — | — | — | — | — |
OEM-1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Constant +12V | — | — | — | — | — | — | — | — |
| B | ECU power +14V (main relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| C | Start signal | — | W36 | — | 0.5 | M800-B-9 | — | — | — |
| E | Malfunction indicator lamp (MIL) | — | W27 | — | 0.5 | M800-A-32 | — | — | — |
| G | Ignition 1 (coils 1+4, wasted spark) | — | W16 | — | 0.5 | M800-A-3 | — | — | — |
| H | Ignition 2 (coils 2+3, wasted spark) | — | W17 | — | 0.5 | M800-A-4 | — | — | — |
| J | A/C relay | — | W22 | — | 0.5 | M800-A-18 | — | — | — |
| M | Vehicle speed | — | W35 | — | 0.5 | M800-B-8 | — | — | — |
| P | Power steering pressure switch | — | W37 | — | 0.5 | M800-B-10 | — | — | — |
| Q | A/C request | — | W38 | — | 0.5 | M800-B-11 | — | — | — |
| R | Cooling fan relay | — | W23 | — | 0.5 | M800-A-1 | — | — | — |
| V | Neutral/clutch switch | — | W39 | — | 0.5 | M800-A-17 | — | — | — |
OEM-2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Power ground | — | W3 | — | 0.85 | SP-GND-1 | — | — | — |
| B | Power ground | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| C | Power ground | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| D | Power ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| E | Crank position (CAS NE) | — | W14 | — | 0.5 | M800-B-1 | — | — | — |
| F | MAF ground | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| G | Cam position (CAS G) | — | W15 | — | 0.5 | M800-B-2 | — | — | — |
| I | Tachometer output | — | — | — | — | — | — | — | — |
| K | +5V sensor supply | — | W13 | — | 0.5 | M800-A-2 | — | — | — |
| M | Throttle position (TPS) | — | W31 | — | 0.5 | M800-A-15 | — | — | — |
| N | O2 sensor | — | W32 | — | 0.5 | M800-A-16 | — | — | — |
| O | Mass air flow (MAF) | — | W30 | — | 0.5 | M800-A-14 | — | — | — |
| P | Intake air temperature (IAT) | — | W34 | — | 0.5 | M800-B-4 | — | — | — |
| Q | Coolant temperature (ECT) | — | W33 | — | 0.5 | M800-B-3 | — | — | — |
| R | PRC solenoid (fuel pressure regulator) | — | W28 | — | 0.5 | M800-A-33 | — | — | — |
| S | Condenser fan relay | — | W24 | — | 0.5 | M800-A-23 | — | — | — |
| T | Fuel pump relay | — | W25 | — | 0.5 | M800-A-24 | — | — | — |
| U | Injector 1 | — | W18 | — | 0.5 | M800-A-19 | — | — | — |
| V | Injector 2 | — | W19 | — | 0.5 | M800-A-20 | — | — | — |
| W | ISC solenoid | — | W26 | — | 0.5 | M800-A-31 | — | — | — |
| X | Evap purge solenoid | — | W29 | — | 0.5 | M800-A-34 | — | — | — |
| Y | Injector 3 | — | W20 | — | 0.5 | M800-A-21 | — | — | — |
| Z | Injector 4 | — | W21 | — | 0.5 | M800-A-22 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W9 | — | 0.5 | OEM-2-F | — | — | — |
| 1 | — | — | W10 | — | 0.5 | M800-B-14 | — | — | — |
| 1 | — | — | W11 | — | 0.5 | M800-B-15 | — | — | — |
| 1 | — | — | W12 | — | 0.5 | M800-B-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 | M800-A-26 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W3 | — | 0.85 | OEM-2-A | — | — | — |
| 1 | — | — | W4 | — | 0.85 | OEM-2-B | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-2-C | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-2-D | — | — | — |
| 1 | — | — | W7 | — | 0.85 | M800-A-10 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | M800-A-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 | — | — | — | single_source | |
| OEM-1-B | ECU power +14V (main relay) | power_in | M800-A-26 | VBAT Battery Positive | power_in | single_source | |
| OEM-1-C | Start signal | digital_in | M800-B-9 | Digital Input 2 | digital_in | single_source | |
| OEM-1-E | Malfunction indicator lamp (MIL) | low_side_out | M800-A-32 | AUX6 | switch_out | single_source | |
| OEM-1-G | Ignition 1 (coils 1+4, wasted spark) | ignition_out | M800-A-3 | IGN1 | ignition_out | single_source | |
| OEM-1-H | Ignition 2 (coils 2+3, wasted spark) | ignition_out | M800-A-4 | IGN2 | ignition_out | single_source | |
| OEM-1-J | A/C relay | low_side_out | M800-A-18 | AUX1 | switch_out | single_source | |
| OEM-1-M | Vehicle speed | digital_in | M800-B-8 | Digital Input 1 | digital_in | single_source | |
| OEM-1-P | Power steering pressure switch | digital_in | M800-B-10 | Digital Input 3 | digital_in | single_source | |
| OEM-1-Q | A/C request | digital_in | M800-B-11 | Digital Input 4 | digital_in | single_source | |
| OEM-1-R | Cooling fan relay | low_side_out | M800-A-1 | AUX2 | switch_out | single_source | |
| OEM-1-V | Neutral/clutch switch | digital_in | M800-A-17 | Analog Voltage Input 4 | analog_in | single_source | |
| OEM-2-A | Power ground | ground | M800-A-10 + M800-A-11 | GND Battery Negative + GND Battery Negative | ground | single_source | |
| OEM-2-B | Power ground | ground | M800-A-10 + M800-A-11 | GND Battery Negative + GND Battery Negative | ground | single_source | |
| OEM-2-C | Power ground | ground | M800-A-10 + M800-A-11 | GND Battery Negative + GND Battery Negative | ground | single_source | |
| OEM-2-D | Power ground | ground | M800-A-10 + M800-A-11 | GND Battery Negative + GND Battery Negative | ground | single_source | |
| OEM-2-E | Crank position (CAS NE) | trigger_in | M800-B-1 | Crank Reference Timing Input | trigger_in | single_source | |
| OEM-2-F | MAF ground | sensor_ground | M800-B-14 + M800-B-15 + M800-B-16 | 0V Comms Reference + 0V Auxiliary Sensor Supply + 0V Engine Sensor Supply | sensor_ground | single_source | |
| OEM-2-G | Cam position (CAS G) | trigger_in | M800-B-2 | Cam Sync Timing Input | trigger_in | single_source | |
| OEM-2-I | Tachometer output | tacho_out | — | — | — | single_source | |
| OEM-2-K | +5V sensor supply | vref | M800-A-2 | 5V Engine Sensor Supply | vref | single_source | |
| OEM-2-M | Throttle position (TPS) | analog_in | M800-A-15 | Analog Voltage Input 2 | analog_in | single_source | |
| OEM-2-N | O2 sensor | lambda_nb_in | M800-A-16 | Analog Voltage Input 3 | analog_in | single_source | |
| OEM-2-O | Mass air flow (MAF) | analog_in | M800-A-14 | AV1 | analog_in | single_source | |
| OEM-2-P | Intake air temperature (IAT) | temp_in | M800-B-4 | Analog Temperature Input 2 | temp_in | single_source | |
| OEM-2-Q | Coolant temperature (ECT) | temp_in | M800-B-3 | Analog Temperature Input 1 | temp_in | single_source | |
| OEM-2-R | PRC solenoid (fuel pressure regulator) | low_side_out | M800-A-33 | AUX7 | switch_out | single_source | |
| OEM-2-S | Condenser fan relay | low_side_out | M800-A-23 | AUX3 | switch_out | single_source | |
| OEM-2-T | Fuel pump relay | low_side_out | M800-A-24 | AUX4 | switch_out | single_source | |
| OEM-2-U | Injector 1 | injector_out | M800-A-19 | INJ1 | injector_out | single_source | |
| OEM-2-V | Injector 2 | injector_out | M800-A-20 | INJ2 | injector_out | single_source | |
| OEM-2-W | ISC solenoid | low_side_out | M800-A-31 | AUX5 | switch_out | single_source | |
| OEM-2-X | Evap purge solenoid | low_side_out | M800-A-34 | AUX8 | switch_out | single_source | |
| OEM-2-Y | Injector 3 | injector_out | M800-A-21 | INJ3 | injector_out | single_source | |
| OEM-2-Z | Injector 4 | injector_out | M800-A-22 | INJ4 | 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 | M800-A-26 | 0.85 | no route | VBAT Battery Positive | — | |
| W3 | OEM-2-A | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W4 | OEM-2-B | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W5 | OEM-2-C | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W6 | OEM-2-D | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W7 | SP-GND-1 | M800-A-10 | 0.85 | no route | GND Battery Negative | — | |
| W8 | SP-GND-1 | M800-A-11 | 0.85 | no route | GND Battery Negative | — | |
| W9 | OEM-2-F | SP-0V-1 | 0.5 | no route | MAF ground | — | |
| W10 | SP-0V-1 | M800-B-14 | 0.5 | no route | 0V Comms Reference | — | |
| W11 | SP-0V-1 | M800-B-15 | 0.5 | no route | 0V Auxiliary Sensor Supply | — | |
| W12 | SP-0V-1 | M800-B-16 | 0.5 | no route | 0V Engine Sensor Supply | — | |
| W13 | OEM-2-K | M800-A-2 | 0.5 | no route | +5V sensor supply | — | |
| W14 | OEM-2-E | M800-B-1 | 0.5 | no route | Crank position (CAS NE) | — | |
| W15 | OEM-2-G | M800-B-2 | 0.5 | no route | Cam position (CAS G) | — | |
| W16 | OEM-1-G | M800-A-3 | 0.5 | no route | Ignition 1 (coils 1+4, wasted spark) | — | |
| W17 | OEM-1-H | M800-A-4 | 0.5 | no route | Ignition 2 (coils 2+3, wasted spark) | — | |
| W18 | OEM-2-U | M800-A-19 | 0.5 | no route | Injector 1 | — | |
| W19 | OEM-2-V | M800-A-20 | 0.5 | no route | Injector 2 | — | |
| W20 | OEM-2-Y | M800-A-21 | 0.5 | no route | Injector 3 | — | |
| W21 | OEM-2-Z | M800-A-22 | 0.5 | no route | Injector 4 | — | |
| W22 | OEM-1-J | M800-A-18 | 0.5 | no route | A/C relay | — | |
| W23 | OEM-1-R | M800-A-1 | 0.5 | no route | Cooling fan relay | — | |
| W24 | OEM-2-S | M800-A-23 | 0.5 | no route | Condenser fan relay | — | |
| W25 | OEM-2-T | M800-A-24 | 0.5 | no route | Fuel pump relay | — | |
| W26 | OEM-2-W | M800-A-31 | 0.5 | no route | ISC solenoid | — | |
| W27 | OEM-1-E | M800-A-32 | 0.5 | no route | Malfunction indicator lamp (MIL) | — | |
| W28 | OEM-2-R | M800-A-33 | 0.5 | no route | PRC solenoid (fuel pressure regulator) | — | |
| W29 | OEM-2-X | M800-A-34 | 0.5 | no route | Evap purge solenoid | — | |
| W30 | OEM-2-O | M800-A-14 | 0.5 | no route | Mass air flow (MAF) | — | |
| W31 | OEM-2-M | M800-A-15 | 0.5 | no route | Throttle position (TPS) | — | |
| W32 | OEM-2-N | M800-A-16 | 0.5 | no route | O2 sensor | — | |
| W33 | OEM-2-Q | M800-B-3 | 0.5 | no route | Coolant temperature (ECT) | — | |
| W34 | OEM-2-P | M800-B-4 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W35 | OEM-1-M | M800-B-8 | 0.5 | no route | Vehicle speed | — | |
| W36 | OEM-1-C | M800-B-9 | 0.5 | no route | Start signal | — | |
| W37 | OEM-1-P | M800-B-10 | 0.5 | no route | Power steering pressure switch | — | |
| W38 | OEM-1-Q | M800-B-11 | 0.5 | no route | A/C request | — | |
| W39 | OEM-1-V | M800-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 |
| connector | 3-1437290-7 | TE | Superseal 1.0 26-way plug | 1.000 | ea |
| connector | 4-1437290-0 | TE | Superseal 1.0 34-way plug, Key 1 | 1.000 | ea |
| terminal | 3-1447221-4 | TE | Superseal 1.0 socket terminal, 20 AWG (0.5 sq mm) | 33.000 | 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 | LOAD_UNKNOWN | M800-A-1 | M800-A-1 "AUX2" drives OEM-1-R Cooling fan relay (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | M800-A-18 | M800-A-18 "AUX1" drives OEM-1-J A/C relay (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | M800-A-23 | M800-A-23 "AUX3" drives OEM-2-S Condenser fan relay (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | M800-A-24 | M800-A-24 "AUX4" drives OEM-2-T Fuel pump relay (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | M800-A-31 | M800-A-31 "AUX5" drives OEM-2-W ISC solenoid (load 1.0 A) but its current rating is unknown. Check the ECU manual. |
| warn | NET_FAMILY | OEM-1-V ↔ M800-A-17 | OEM-1-V "Neutral/clutch switch" [digital_in] is wired to M800-A-17 "Analog Voltage Input 4" [analog_in]. Analog and digital on one net. A switch on an analog input works with a pull-up and a threshold; an analog sensor on a digital input loses its value. |
| info | NET_FAMILY | OEM-1-E ↔ M800-A-32 | OEM-1-E "Malfunction indicator lamp (MIL)" [low_side_out] is wired to M800-A-32 "AUX6" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-1-J ↔ M800-A-18 | OEM-1-J "A/C relay" [low_side_out] is wired to M800-A-18 "AUX1" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-1-R ↔ M800-A-1 | OEM-1-R "Cooling fan relay" [low_side_out] is wired to M800-A-1 "AUX2" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-2-R ↔ M800-A-33 | OEM-2-R "PRC solenoid (fuel pressure regulator)" [low_side_out] is wired to M800-A-33 "AUX7" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-2-S ↔ M800-A-23 | OEM-2-S "Condenser fan relay" [low_side_out] is wired to M800-A-23 "AUX3" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-2-T ↔ M800-A-24 | OEM-2-T "Fuel pump relay" [low_side_out] is wired to M800-A-24 "AUX4" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-2-W ↔ M800-A-31 | OEM-2-W "ISC solenoid" [low_side_out] is wired to M800-A-31 "AUX5" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-2-X ↔ M800-A-34 | OEM-2-X "Evap purge solenoid" [low_side_out] is wired to M800-A-34 "AUX8" [switch_out]. Configure this output as low side. |
| info | UNMAPPED | OEM | 1 optional OEM pins are not mapped: OEM-2-I Tachometer output |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-1-A | Battery-constant (memory) feed of the stock ECU: the new ECU has no such input, so it is not needed. | mapping-proposal |
Notes
Auto-mapped by auto_map() from the library pin data on 2026-10-06. Review every wire against both manuals before building. Not wired: - OEM-1 A: Constant +12V: MoTeC M800 has no battery-constant input; not needed - OEM-2 I: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on MoTeC M800
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 M400/M600/M800/M880 Manual — Appendix L: Pin list by Function | https://starracecars.com/wp-content/uploads/resources/M400_M600_M800_M880_Manual_A5.pdf | archive | 2026-10-05 | b69bb8ffb674 |
| 4 | vendor_doc | MoTeC M800 OEM WRX56 Installation | https://motec.com.au | archive | 2026-10-05 | 2ca4be92bb65 |