MX-5 Miata NA8 1996-97 (BP-ZE, 1.8, OBD-II) → MoTeC M800 universal (auto)
MX-5 Miata NA8 1996-97 (BP-ZE, 1.8, OBD-II) — MoTeC — M800
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 2026-10-12
Before you start
Not confident with automotive wiring? Have a professional harness builder or tuner do it, or check your work before first power-up. A wiring mistake can damage the ECU, the engine or the car, or start a fire.
| Status | draft · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | 1: read the Findings page before cutting any wire |
| Size of the job | 47 wires · 8 connectors · 3 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-4-B | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | SP-14V-1 | M800-A-26 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | OEM-4-A | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-4-C | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-4-D | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-4-K | 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-3-O | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-4-H | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-0V-1 | M800-B-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | SP-0V-1 | M800-B-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | SP-0V-1 | M800-B-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-3-I | M800-A-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-4-E | M800-B-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-4-G | M800-B-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-4-N | M800-A-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-4-R | M800-A-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-4-U | M800-A-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-4-V | M800-A-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-4-W | M800-A-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-4-X | M800-A-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-3-B | M800-A-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-3-F | M800-A-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-3-G | M800-B-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-1-A | M800-A-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-1-B | M800-A-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-1-G | M800-A-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-1-U | M800-A-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-3-M | M800-A-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-1-E | M800-A-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-4-J | M800-A-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-4-O | M800-A-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-4-P | M800-A-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-4-Q | M800-A-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-4-T | M800-A-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-3-H | M800-A-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-3-N | M800-A-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-3-C | M800-A-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-3-D | M800-B-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-3-K | M800-B-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-3-J | M800-B-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-1-M | M800-B-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-1-C | M800-B-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-1-K | M800-B-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-1-L | M800-B-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-1-Q | M800-B-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 | M800-A-2 | M800-A-10 | open (OL) | 5 V sensor reference must not touch power ground | |
| 2 | M800-A-2 | M800-B-14 | open (OL) | 5 V sensor reference must not touch sensor ground | |
| 3 | M800-A-10 | M800-A-26 | open (OL) | power ground must not touch +12 V supply | |
| 4 | M800-A-2 | M800-A-26 | open (OL) | 5 V sensor reference must not touch +12 V supply | |
| 5 | M800-B-14 | M800-A-26 | open (OL) | sensor ground must not touch +12 V supply |
If any reading doesn't match, stop and get help before powering up.
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 | — | W27 | — | 0.5 | OEM-1-B | — | — | — |
| 2 | 5V Engine Sensor Supply | — | W14 | — | 0.5 | OEM-3-I | — | — | — |
| 3 | IGN1 | — | W17 | — | 0.5 | OEM-4-N | — | — | — |
| 4 | IGN2 | — | W18 | — | 0.5 | OEM-4-R | — | — | — |
| 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 | — | W24 | — | 0.5 | OEM-3-F | — | — | — |
| 15 | Analog Voltage Input 2 | — | W23 | — | 0.5 | OEM-3-B | — | — | — |
| 16 | Analog Voltage Input 3 | — | W37 | — | 0.5 | OEM-3-H | — | — | — |
| 17 | Analog Voltage Input 4 | — | W38 | — | 0.5 | OEM-3-N | — | — | — |
| 18 | AUX1 | — | W26 | — | 0.5 | OEM-1-A | — | — | — |
| 19 | INJ1 | — | W19 | — | 0.5 | OEM-4-U | — | — | — |
| 20 | INJ2 | — | W20 | — | 0.5 | OEM-4-V | — | — | — |
| 21 | INJ3 | — | W21 | — | 0.5 | OEM-4-W | — | — | — |
| 22 | INJ4 | — | W22 | — | 0.5 | OEM-4-X | — | — | — |
| 23 | AUX3 | — | W28 | — | 0.5 | OEM-1-G | — | — | — |
| 24 | AUX4 | — | W29 | — | 0.5 | OEM-1-U | — | — | — |
| 25 | Analog Voltage Input 5 | — | W39 | — | 0.5 | OEM-3-C | — | — | — |
| 26 | VBAT Battery Positive | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 27 | INJ5 | — | W34 | — | 0.5 | OEM-4-P | — | — | — |
| 28 | INJ6 | — | W35 | — | 0.5 | OEM-4-Q | — | — | — |
| 29 | INJ7 | — | W36 | — | 0.5 | OEM-4-T | — | — | — |
| 30 | INJ8 | — | — | — | — | — | — | — | — |
| 31 | AUX5 | — | W30 | — | 0.5 | OEM-3-M | — | — | — |
| 32 | AUX6 | — | W31 | — | 0.5 | OEM-1-E | — | — | — |
| 33 | AUX7 | — | W32 | — | 0.5 | OEM-4-J | — | — | — |
| 34 | AUX8 | — | W33 | — | 0.5 | OEM-4-O | — | — | — |
M800-B
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Crank Reference Timing Input | — | W15 | — | 0.5 | OEM-4-E | — | — | — |
| 2 | Cam Sync Timing Input | — | W16 | — | 0.5 | OEM-4-G | — | — | — |
| 3 | Analog Temperature Input 1 | — | W25 | — | 0.5 | OEM-3-G | — | — | — |
| 4 | Analog Temperature Input 2 | — | W41 | — | 0.5 | OEM-3-K | — | — | — |
| 5 | Analog Temperature Input 3 | — | — | — | — | — | — | — | — |
| 6 | Analog Temperature Input 4 | — | — | — | — | — | — | — | — |
| 7 | Analog Temperature Input 5 | — | — | — | — | — | — | — | — |
| 8 | Digital Input 1 | — | W43 | — | 0.5 | OEM-1-M | — | — | — |
| 9 | Digital Input 2 | — | W44 | — | 0.5 | OEM-1-C | — | — | — |
| 10 | Digital Input 3 | — | W45 | — | 0.5 | OEM-1-K | — | — | — |
| 11 | Digital Input 4 | — | W46 | — | 0.5 | OEM-1-L | — | — | — |
| 12 | Lambda2 Sense Voltage | — | — | — | — | — | — | — | — |
| 13 | Lambda2 Pump Current | — | — | — | — | — | — | — | — |
| 14 | 0V Comms Reference | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| 15 | 0V Auxiliary Sensor Supply | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 16 | 0V Engine Sensor Supply | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 17 | RS232 Transmit Data | — | — | — | — | — | — | — | — |
| 18 | RS232 Receive Data | — | — | — | — | — | — | — | — |
| 19 | Analog Temperature Input 6 | — | — | — | — | — | — | — | — |
| 20 | Analog Voltage Input 6 | — | W40 | — | 0.5 | OEM-3-D | — | — | — |
| 21 | AV7 | — | W42 | — | 0.5 | OEM-3-J | — | — | — |
| 22 | AV8 | — | W47 | — | 0.5 | OEM-1-Q | — | — | — |
| 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 | Cooling fan relay (low-side) | — | W26 | — | 0.5 | M800-A-18 | — | — | — |
| B | A/C condenser fan relay | — | W27 | — | 0.5 | M800-A-1 | — | — | — |
| C | Starter input (12V while cranking) | — | W44 | — | 0.5 | M800-B-9 | — | — | — |
| E | Check engine light (MIL) | — | W31 | — | 0.5 | M800-A-32 | — | — | — |
| G | A/C clutch relay | — | W28 | — | 0.5 | M800-A-23 | — | — | — |
| K | A/C pressure switch (A/C request) | — | W45 | — | 0.5 | M800-B-10 | — | — | — |
| L | Clutch switch | — | W46 | — | 0.5 | M800-B-11 | — | — | — |
| M | Vehicle speed sensor (VSS) | — | W43 | — | 0.5 | M800-B-8 | — | — | — |
| Q | Brake switch | — | W47 | — | 0.5 | M800-B-22 | — | — | — |
| U | Fuel pump relay (low-side) | — | W29 | — | 0.5 | M800-A-24 | — | — | — |
OEM-3
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| B | MAF sensor input | — | W23 | — | 0.5 | M800-A-15 | — | — | — |
| C | Front O2 sensor input | — | W39 | — | 0.5 | M800-A-25 | — | — | — |
| D | Rear O2 sensor input | — | W40 | — | 0.5 | M800-B-20 | — | — | — |
| F | Throttle position (TPS) | — | W24 | — | 0.5 | M800-A-14 | — | — | — |
| G | Engine coolant temp (CLT) | — | W25 | — | 0.5 | M800-B-3 | — | — | — |
| H | EGR boost sensor | — | W37 | — | 0.5 | M800-A-16 | — | — | — |
| I | +5V sensor reference | — | W14 | — | 0.5 | M800-A-2 | — | — | — |
| J | EGR valve position sensor | — | W42 | — | 0.5 | M800-B-21 | — | — | — |
| K | Intake air temp (IAT) | — | W41 | — | 0.5 | M800-B-4 | — | — | — |
| L | Idle switch (closed throttle) | — | — | — | — | — | — | — | — |
| M | Front O2 heater control | — | W30 | — | 0.5 | M800-A-31 | — | — | — |
| N | EGR boost sensor (2nd channel) | — | W38 | — | 0.5 | M800-A-17 | — | — | — |
| O | Sensor ground | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| P | Power steering pressure switch | — | — | — | — | — | — | — | — |
OEM-4
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Chassis ground | — | W3 | — | 0.85 | SP-GND-1 | — | — | — |
| B | ECU power +12V (main relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| C | Chassis ground | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| D | Chassis ground | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| E | Crank position (CKP) sensor | — | W15 | — | 0.5 | M800-B-1 | — | — | — |
| F | CAS SGT (cam trigger) | — | — | — | — | — | — | — | — |
| G | CAS SGC (cam sync) | — | W16 | — | 0.5 | M800-B-2 | — | — | — |
| H | Crank pickup timing ground (CKP gnd) | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| I | Permanent +12V (battery) | — | — | — | — | — | — | — | — |
| J | PRC solenoid (FPR control) | — | W32 | — | 0.5 | M800-A-33 | — | — | — |
| K | Chassis ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| L | Tachometer output | — | — | — | — | — | — | — | — |
| N | Ignition coil trigger (cyl 1&4) | — | W17 | — | 0.5 | M800-A-3 | — | — | — |
| O | EGR vent solenoid | — | W33 | — | 0.5 | M800-A-34 | — | — | — |
| P | EGR vacuum solenoid | — | W34 | — | 0.5 | M800-A-27 | — | — | — |
| Q | Idle air control (IAC) valve | — | W35 | — | 0.5 | M800-A-28 | — | — | — |
| R | Ignition coil trigger (cyl 2&3) | — | W18 | — | 0.5 | M800-A-4 | — | — | — |
| T | EVAP purge solenoid | — | W36 | — | 0.5 | M800-A-29 | — | — | — |
| U | Injector 1 (cyl 1) | — | W19 | — | 0.5 | M800-A-19 | — | — | — |
| V | Injector 2 (cyl 2) | — | W20 | — | 0.5 | M800-A-20 | — | — | — |
| W | Injector 3 (cyl 3) | — | W21 | — | 0.5 | M800-A-21 | — | — | — |
| X | Injector 4 (cyl 4) | — | W22 | — | 0.5 | M800-A-22 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W9 | — | 0.5 | OEM-3-O | — | — | — |
| 1 | — | — | W10 | — | 0.5 | OEM-4-H | — | — | — |
| 1 | — | — | W11 | — | 0.5 | M800-B-14 | — | — | — |
| 1 | — | — | W12 | — | 0.5 | M800-B-15 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | M800-B-16 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-4-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-4-A | — | — | — |
| 1 | — | — | W4 | — | 0.85 | OEM-4-C | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-4-D | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-4-K | — | — | — |
| 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 | Cooling fan relay (low-side) | low_side_out | M800-A-18 | AUX1 | switch_out | corroborated | |
| OEM-1-B | A/C condenser fan relay | low_side_out | M800-A-1 | AUX2 | switch_out | corroborated | |
| OEM-1-C | Starter input (12V while cranking) | digital_in | M800-B-9 | Digital Input 2 | digital_in | corroborated | |
| OEM-1-E | Check engine light (MIL) | low_side_out | M800-A-32 | AUX6 | switch_out | corroborated | |
| OEM-1-G | A/C clutch relay | low_side_out | M800-A-23 | AUX3 | switch_out | corroborated | |
| OEM-1-K | A/C pressure switch (A/C request) | digital_in | M800-B-10 | Digital Input 3 | digital_in | corroborated | |
| OEM-1-L | Clutch switch | digital_in | M800-B-11 | Digital Input 4 | digital_in | corroborated | |
| OEM-1-M | Vehicle speed sensor (VSS) | digital_in | M800-B-8 | Digital Input 1 | digital_in | corroborated | |
| OEM-1-Q | Brake switch | digital_in | M800-B-22 | AV8 | analog_in | corroborated | |
| OEM-1-U | Fuel pump relay (low-side) | low_side_out | M800-A-24 | AUX4 | switch_out | corroborated | |
| OEM-3-B | MAF sensor input | analog_in | M800-A-15 | Analog Voltage Input 2 | analog_in | corroborated | |
| OEM-3-C | Front O2 sensor input | lambda_nb_in | M800-A-25 | Analog Voltage Input 5 | analog_in | corroborated | |
| OEM-3-D | Rear O2 sensor input | lambda_nb_in | M800-B-20 | Analog Voltage Input 6 | analog_in | corroborated | |
| OEM-3-F | Throttle position (TPS) | analog_in | M800-A-14 | AV1 | analog_in | corroborated | |
| OEM-3-G | Engine coolant temp (CLT) | temp_in | M800-B-3 | Analog Temperature Input 1 | temp_in | corroborated | |
| OEM-3-H | EGR boost sensor | analog_in | M800-A-16 | Analog Voltage Input 3 | analog_in | corroborated | |
| OEM-3-I | +5V sensor reference | vref | M800-A-2 | 5V Engine Sensor Supply | vref | corroborated | |
| OEM-3-J | EGR valve position sensor | analog_in | M800-B-21 | AV7 | analog_in | corroborated | |
| OEM-3-K | Intake air temp (IAT) | temp_in | M800-B-4 | Analog Temperature Input 2 | temp_in | corroborated | |
| OEM-3-L | Idle switch (closed throttle) | digital_in | — | — | — | corroborated | |
| OEM-3-M | Front O2 heater control | low_side_out | M800-A-31 | AUX5 | switch_out | corroborated | |
| OEM-3-N | EGR boost sensor (2nd channel) | analog_in | M800-A-17 | Analog Voltage Input 4 | analog_in | corroborated | |
| OEM-3-O | Sensor 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 | corroborated | |
| OEM-3-P | Power steering pressure switch | digital_in | — | — | — | corroborated | |
| OEM-4-A | Chassis ground | ground | M800-A-10 + M800-A-11 | GND Battery Negative + GND Battery Negative | ground | corroborated | |
| OEM-4-B | ECU power +12V (main relay) | power_in | M800-A-26 | VBAT Battery Positive | power_in | corroborated | |
| OEM-4-C | Chassis ground | ground | M800-A-10 + M800-A-11 | GND Battery Negative + GND Battery Negative | ground | corroborated | |
| OEM-4-D | Chassis ground | ground | M800-A-10 + M800-A-11 | GND Battery Negative + GND Battery Negative | ground | corroborated | |
| OEM-4-E | Crank position (CKP) sensor | trigger_in | M800-B-1 | Crank Reference Timing Input | trigger_in | corroborated | |
| OEM-4-F | CAS SGT (cam trigger) | trigger_in | — | — | — | corroborated | |
| OEM-4-G | CAS SGC (cam sync) | trigger_in | M800-B-2 | Cam Sync Timing Input | trigger_in | corroborated | |
| OEM-4-H | Crank pickup timing ground (CKP gnd) | sensor_ground | M800-B-14 + M800-B-15 + M800-B-16 | 0V Comms Reference + 0V Auxiliary Sensor Supply + 0V Engine Sensor Supply | sensor_ground | corroborated | |
| OEM-4-I | Permanent +12V (battery) | power_in | — | — | — | corroborated | |
| OEM-4-J | PRC solenoid (FPR control) | low_side_out | M800-A-33 | AUX7 | switch_out | corroborated | |
| OEM-4-K | Chassis ground | ground | M800-A-10 + M800-A-11 | GND Battery Negative + GND Battery Negative | ground | corroborated | |
| OEM-4-L | Tachometer output | tacho_out | — | — | — | corroborated | |
| OEM-4-N | Ignition coil trigger (cyl 1&4) | ignition_out | M800-A-3 | IGN1 | ignition_out | corroborated | |
| OEM-4-O | EGR vent solenoid | low_side_out | M800-A-34 | AUX8 | switch_out | corroborated | |
| OEM-4-P | EGR vacuum solenoid | low_side_out | M800-A-27 | INJ5 | injector_out | corroborated | |
| OEM-4-Q | Idle air control (IAC) valve | low_side_out | M800-A-28 | INJ6 | injector_out | corroborated | |
| OEM-4-R | Ignition coil trigger (cyl 2&3) | ignition_out | M800-A-4 | IGN2 | ignition_out | corroborated | |
| OEM-4-T | EVAP purge solenoid | low_side_out | M800-A-29 | INJ7 | injector_out | corroborated | |
| OEM-4-U | Injector 1 (cyl 1) | injector_out | M800-A-19 | INJ1 | injector_out | corroborated | |
| OEM-4-V | Injector 2 (cyl 2) | injector_out | M800-A-20 | INJ2 | injector_out | corroborated | |
| OEM-4-W | Injector 3 (cyl 3) | injector_out | M800-A-21 | INJ3 | injector_out | corroborated | |
| OEM-4-X | Injector 4 (cyl 4) | injector_out | M800-A-22 | INJ4 | injector_out | corroborated |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-4-B | SP-14V-1 | 0.85 | no route | ECU power +12V (main relay) | — | |
| W2 | SP-14V-1 | M800-A-26 | 0.85 | no route | VBAT Battery Positive | — | |
| W3 | OEM-4-A | SP-GND-1 | 0.85 | no route | Chassis ground | — | |
| W4 | OEM-4-C | SP-GND-1 | 0.85 | no route | Chassis ground | — | |
| W5 | OEM-4-D | SP-GND-1 | 0.85 | no route | Chassis ground | — | |
| W6 | OEM-4-K | SP-GND-1 | 0.85 | no route | Chassis 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-3-O | SP-0V-1 | 0.5 | no route | Sensor ground | — | |
| W10 | OEM-4-H | SP-0V-1 | 0.5 | no route | Crank pickup timing ground (CKP gnd) | — | |
| W11 | SP-0V-1 | M800-B-14 | 0.5 | no route | 0V Comms Reference | — | |
| W12 | SP-0V-1 | M800-B-15 | 0.5 | no route | 0V Auxiliary Sensor Supply | — | |
| W13 | SP-0V-1 | M800-B-16 | 0.5 | no route | 0V Engine Sensor Supply | — | |
| W14 | OEM-3-I | M800-A-2 | 0.5 | no route | +5V sensor reference | — | |
| W15 | OEM-4-E | M800-B-1 | 0.5 | no route | Crank position (CKP) sensor | — | |
| W16 | OEM-4-G | M800-B-2 | 0.5 | no route | CAS SGC (cam sync) | — | |
| W17 | OEM-4-N | M800-A-3 | 0.5 | no route | Ignition coil trigger (cyl 1&4) | — | |
| W18 | OEM-4-R | M800-A-4 | 0.5 | no route | Ignition coil trigger (cyl 2&3) | — | |
| W19 | OEM-4-U | M800-A-19 | 0.5 | no route | Injector 1 (cyl 1) | — | |
| W20 | OEM-4-V | M800-A-20 | 0.5 | no route | Injector 2 (cyl 2) | — | |
| W21 | OEM-4-W | M800-A-21 | 0.5 | no route | Injector 3 (cyl 3) | — | |
| W22 | OEM-4-X | M800-A-22 | 0.5 | no route | Injector 4 (cyl 4) | — | |
| W23 | OEM-3-B | M800-A-15 | 0.5 | no route | MAF sensor input | — | |
| W24 | OEM-3-F | M800-A-14 | 0.5 | no route | Throttle position (TPS) | — | |
| W25 | OEM-3-G | M800-B-3 | 0.5 | no route | Engine coolant temp (CLT) | — | |
| W26 | OEM-1-A | M800-A-18 | 0.5 | no route | Cooling fan relay (low-side) | — | |
| W27 | OEM-1-B | M800-A-1 | 0.5 | no route | A/C condenser fan relay | — | |
| W28 | OEM-1-G | M800-A-23 | 0.5 | no route | A/C clutch relay | — | |
| W29 | OEM-1-U | M800-A-24 | 0.5 | no route | Fuel pump relay (low-side) | — | |
| W30 | OEM-3-M | M800-A-31 | 0.5 | no route | Front O2 heater control | — | |
| W31 | OEM-1-E | M800-A-32 | 0.5 | no route | Check engine light (MIL) | — | |
| W32 | OEM-4-J | M800-A-33 | 0.5 | no route | PRC solenoid (FPR control) | — | |
| W33 | OEM-4-O | M800-A-34 | 0.5 | no route | EGR vent solenoid | — | |
| W34 | OEM-4-P | M800-A-27 | 0.5 | no route | EGR vacuum solenoid | — | |
| W35 | OEM-4-Q | M800-A-28 | 0.5 | no route | Idle air control (IAC) valve | — | |
| W36 | OEM-4-T | M800-A-29 | 0.5 | no route | EVAP purge solenoid | — | |
| W37 | OEM-3-H | M800-A-16 | 0.5 | no route | EGR boost sensor | — | |
| W38 | OEM-3-N | M800-A-17 | 0.5 | no route | EGR boost sensor (2nd channel) | — | |
| W39 | OEM-3-C | M800-A-25 | 0.5 | no route | Front O2 sensor input | — | |
| W40 | OEM-3-D | M800-B-20 | 0.5 | no route | Rear O2 sensor input | — | |
| W41 | OEM-3-K | M800-B-4 | 0.5 | no route | Intake air temp (IAT) | — | |
| W42 | OEM-3-J | M800-B-21 | 0.5 | no route | EGR valve position sensor | — | |
| W43 | OEM-1-M | M800-B-8 | 0.5 | no route | Vehicle speed sensor (VSS) | — | |
| W44 | OEM-1-C | M800-B-9 | 0.5 | no route | Starter input (12V while cranking) | — | |
| W45 | OEM-1-K | M800-B-10 | 0.5 | no route | A/C pressure switch (A/C request) | — | |
| W46 | OEM-1-L | M800-B-11 | 0.5 | no route | Clutch switch | — | |
| W47 | OEM-1-Q | M800-B-22 | 0.5 | no route | Brake switch | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|---|---|---|---|---|
| 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) | 40.000 | ea |
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| No configured channels. | |||||||
Findings
Open (18)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | REQUIRED_UNMAPPED | OEM-4-F | Required OEM function "CAS SGT (cam trigger)" (trigger_in) is not connected to the new ECU. |
| warn | LOAD_UNKNOWN | M800-A-1 | M800-A-1 "AUX2" drives OEM-1-B A/C condenser 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-A Cooling fan relay (low-side) (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-1-G A/C clutch 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-1-U Fuel pump relay (low-side) (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | NET_FAMILY | OEM-1-Q ↔ M800-B-22 | OEM-1-Q "Brake switch" [digital_in] is wired to M800-B-22 "AV8" [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-A ↔ M800-A-18 | OEM-1-A "Cooling fan relay (low-side)" [low_side_out] is wired to M800-A-18 "AUX1" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-1-B ↔ M800-A-1 | OEM-1-B "A/C condenser fan relay" [low_side_out] is wired to M800-A-1 "AUX2" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-1-E ↔ M800-A-32 | OEM-1-E "Check engine light (MIL)" [low_side_out] is wired to M800-A-32 "AUX6" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-1-G ↔ M800-A-23 | OEM-1-G "A/C clutch relay" [low_side_out] is wired to M800-A-23 "AUX3" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-1-U ↔ M800-A-24 | OEM-1-U "Fuel pump relay (low-side)" [low_side_out] is wired to M800-A-24 "AUX4" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-3-M ↔ M800-A-31 | OEM-3-M "Front O2 heater control" [low_side_out] is wired to M800-A-31 "AUX5" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-4-J ↔ M800-A-33 | OEM-4-J "PRC solenoid (FPR control)" [low_side_out] is wired to M800-A-33 "AUX7" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-4-O ↔ M800-A-34 | OEM-4-O "EGR vent solenoid" [low_side_out] is wired to M800-A-34 "AUX8" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-4-P ↔ M800-A-27 | OEM-4-P "EGR vacuum solenoid" [low_side_out] is wired to M800-A-27 "INJ5" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-4-Q ↔ M800-A-28 | OEM-4-Q "Idle air control (IAC) valve" [low_side_out] is wired to M800-A-28 "INJ6" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-4-T ↔ M800-A-29 | OEM-4-T "EVAP purge solenoid" [low_side_out] is wired to M800-A-29 "INJ7" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | UNMAPPED | OEM | 3 optional OEM pins are not mapped: OEM-3-L Idle switch (closed throttle); OEM-3-P Power steering pressure switch; OEM-4-L Tachometer output |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-4-I | Battery-constant (memory) feed of the stock ECU: the new ECU has no such input, so it is not needed. | mapping-proposal |
Notes
Fit check: unconfirmed. Confirm these before building: - Trigger pattern for Mazda BP-ZE not found in the ECU's docs (No documented M800 OEM preset.) Auto-mapped by auto_map() from the library pin data on 2026-10-11. Review every wire against both manuals before building. Open items: - OEM-4 F: CAS SGT (cam trigger): no free cam_hall/cam_vr/frequency_in input on MoTeC M800 Not wired: - OEM-4 I: Permanent +12V (battery): MoTeC M800 has no battery-constant input; not needed - OEM-4 L: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on MoTeC M800 - OEM-3 L: Idle switch (closed throttle): no free switch_in/frequency_in/analog_0_5 on MoTeC M800 - OEM-3 P: Power steering pressure switch: no free switch_in/frequency_in/analog_0_5 on MoTeC M800
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | AEM EMS 30-1720 Plug-and-Play adapter manual (1996-97 Miata) | https://static.summitracing.com/global/images/instructions/avm-30-1720.pdf | — | — | — |
| 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 |
| 3 | community_copy | Mellens.net: 1996 Mazda Miata wiring diagrams (FSM-derived) | http://www.mellens.net/mazda/mazda_miata_extra_manual/1996_wiring.pdf | — | — | — |