MX-5 Miata NA8 1996-97 (BP-ZE, 1.8, OBD-II) → MaxxECU MaxxECU GEN2 TRACK (auto)
MX-5 Miata NA8 1996-97 (BP-ZE, 1.8, OBD-II) — MaxxECU — MaxxECU GEN2 TRACK
⚠ 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 | 49 wires · 9 connectors · 0 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-4-B | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | SP-14V-1 | MAXXECUGEN2T-MX1-25 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-14V-1 | MAXXECUGEN2T-MX2-25 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-4-A | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-4-C | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-4-D | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-4-K | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | MAXXECUGEN2T-MX1-9 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | MAXXECUGEN2T-MX2-9 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-GND-1 | MAXXECUGEN2T-MX3-9 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-3-O | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-4-H | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | SP-0V-1 | MAXXECUGEN2T-MX1-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-3-I | MAXXECUGEN2T-MX1-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-4-E | MAXXECUGEN2T-MX1-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-4-G | MAXXECUGEN2T-MX1-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-4-N | MAXXECUGEN2T-MX1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-4-R | MAXXECUGEN2T-MX1-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-4-U | MAXXECUGEN2T-MX1-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-4-V | MAXXECUGEN2T-MX1-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-4-W | MAXXECUGEN2T-MX1-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-4-X | MAXXECUGEN2T-MX1-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-3-B | MAXXECUGEN2T-MX1-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-3-F | MAXXECUGEN2T-MX1-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-3-G | MAXXECUGEN2T-MX1-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-1-A | MAXXECUGEN2T-MX1-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-1-B | MAXXECUGEN2T-MX1-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-1-G | MAXXECUGEN2T-MX1-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-1-U | MAXXECUGEN2T-MX1-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-3-M | MAXXECUGEN2T-MX2-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-1-E | MAXXECUGEN2T-MX1-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-4-J | MAXXECUGEN2T-MX2-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-4-O | MAXXECUGEN2T-MX3-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-4-P | MAXXECUGEN2T-MX2-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-4-Q | MAXXECUGEN2T-MX2-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-4-T | MAXXECUGEN2T-MX3-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-3-H | MAXXECUGEN2T-MX1-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-3-N | MAXXECUGEN2T-MX1-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-3-C | MAXXECUGEN2T-MX2-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-3-D | MAXXECUGEN2T-MX2-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-3-K | MAXXECUGEN2T-MX2-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-3-J | MAXXECUGEN2T-MX2-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-1-M | MAXXECUGEN2T-MX1-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-1-C | MAXXECUGEN2T-MX1-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-1-K | MAXXECUGEN2T-MX3-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-1-L | MAXXECUGEN2T-MX3-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-1-Q | MAXXECUGEN2T-MX2-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | OEM-3-L | MAXXECUGEN2T-MX2-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W49 | OEM-3-P | MAXXECUGEN2T-MX2-16 | 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 | MAXXECUGEN2T-MX1-12 | MAXXECUGEN2T-MX1-14 | open (OL) | 5 V sensor reference must not touch sensor ground | |
| 2 | MAXXECUGEN2T-MX1-12 | MAXXECUGEN2T-MX1-9 | open (OL) | 5 V sensor reference must not touch power ground | |
| 3 | MAXXECUGEN2T-MX1-12 | MAXXECUGEN2T-MX1-25 | open (OL) | 5 V sensor reference must not touch +12 V supply | |
| 4 | MAXXECUGEN2T-MX1-14 | MAXXECUGEN2T-MX1-25 | open (OL) | sensor ground must not touch +12 V supply | |
| 5 | MAXXECUGEN2T-MX1-9 | MAXXECUGEN2T-MX1-25 | open (OL) | power 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
MAXXECUGEN2T-MX1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Ignition 1 | — | W17 | — | 0.5 | OEM-4-N | — | — | — |
| 10 | Digital/VR 1 SIGNAL + | — | W15 | — | 0.5 | OEM-4-E | — | — | — |
| 11 | Digital/VR 1 SIGNAL - | — | — | — | — | — | — | — | — |
| 12 | Digital/VR 1 POWER SUPPLY | — | W14 | — | 0.5 | OEM-3-I | — | — | — |
| 13 | Digital/VR 1 SHIELD | — | — | — | — | — | — | — | — |
| 14 | SENSOR GND | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 15 | CAN L | — | — | — | — | — | — | — | — |
| 16 | CAN H | — | — | — | — | — | — | — | — |
| 17 | GP out 5 (GND) | — | W31 | — | 0.5 | OEM-1-E | — | — | — |
| 18 | Digital/VR 2 SIGNAL + | — | W16 | — | 0.5 | OEM-4-G | — | — | — |
| 19 | Digital/VR 2 SIGNAL - | — | — | — | — | — | — | — | — |
| 2 | Ignition 2 | — | W18 | — | 0.5 | OEM-4-R | — | — | — |
| 20 | Digital/VR 2 POWER SUPPLY | — | — | — | — | — | — | — | — |
| 21 | Digital/VR 2 SHIELD | — | — | — | — | — | — | — | — |
| 22 | 5V power supply | — | — | — | — | — | — | — | — |
| 23 | Digital/VR 3 SIGNAL + | — | W43 | — | 0.5 | OEM-1-M | — | — | — |
| 24 | Digital/VR 4 SIGNAL + | — | W44 | — | 0.5 | OEM-1-C | — | — | — |
| 25 | 12V supply 1 | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 26 | AIN 1 | — | W23 | — | 0.5 | OEM-3-B | — | — | — |
| 27 | AIN 2 | — | W24 | — | 0.5 | OEM-3-F | — | — | — |
| 28 | AIN 3 | — | W25 | — | 0.5 | OEM-3-G | — | — | — |
| 29 | AIN 4 | — | W37 | — | 0.5 | OEM-3-H | — | — | — |
| 3 | Ignition 3 | — | — | — | — | — | — | — | — |
| 30 | AIN 5 | — | W38 | — | 0.5 | OEM-3-N | — | — | — |
| 31 | INJECTOR 1 | — | W19 | — | 0.5 | OEM-4-U | — | — | — |
| 32 | INJECTOR 2 | — | W20 | — | 0.5 | OEM-4-V | — | — | — |
| 33 | INJECTOR 3 | — | W21 | — | 0.5 | OEM-4-W | — | — | — |
| 34 | INJECTOR 4 | — | W22 | — | 0.5 | OEM-4-X | — | — | — |
| 4 | Ignition 4 | — | — | — | — | — | — | — | — |
| 5 | GP out 1 (GND) | — | W26 | — | 0.5 | OEM-1-A | — | — | — |
| 6 | GP out 2 (GND) | — | W27 | — | 0.5 | OEM-1-B | — | — | — |
| 7 | GP out 3 (GND) | — | W28 | — | 0.5 | OEM-1-G | — | — | — |
| 8 | GP out 4 (GND) | — | W29 | — | 0.5 | OEM-1-U | — | — | — |
| 9 | Engine gnd | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
MAXXECUGEN2T-MX2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Ignition 5 | — | — | — | — | — | — | — | — |
| 10 | WBO2 Sensor 1 VS | — | — | — | — | — | — | — | — |
| 11 | WBO2 Sensor 1 COM/VREF | — | — | — | — | — | — | — | — |
| 12 | GP OUT 7 / WBO2 Sensor 1 H- | — | W30 | — | 0.5 | OEM-3-M | — | — | — |
| 13 | AIN 9 | — | W42 | — | 0.5 | OEM-3-J | — | — | — |
| 14 | AIN 10 | — | W47 | — | 0.5 | OEM-1-Q | — | — | — |
| 15 | AIN 11 | — | W48 | — | 0.5 | OEM-3-L | — | — | — |
| 16 | AIN 12 | — | W49 | — | 0.5 | OEM-3-P | — | — | — |
| 17 | AIN 13 | — | — | — | — | — | — | — | — |
| 18 | WBO2 sensor 1 RCAL | — | — | — | — | — | — | — | — |
| 19 | WBO2 sensor 1 IP | — | — | — | — | — | — | — | — |
| 2 | Ignition 6 | — | — | — | — | — | — | — | — |
| 20 | 12V WBO2 sensor 1 H+ | — | — | — | — | — | — | — | — |
| 21 | WBO2 sensor 1 SHIELD | — | — | — | — | — | — | — | — |
| 22 | AIN 14 | — | — | — | — | — | — | — | — |
| 23 | AIN 15 | — | — | — | — | — | — | — | — |
| 24 | 12V supply 3 | — | — | — | — | — | — | — | — |
| 25 | 12V supply 2 | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 26 | KNOCK1 SHIELD | — | — | — | — | — | — | — | — |
| 27 | KNOCK 1- | — | — | — | — | — | — | — | — |
| 28 | KNOCK 1+ | — | — | — | — | — | — | — | — |
| 29 | KNOCK 2 SHIELD | — | — | — | — | — | — | — | — |
| 3 | GP out 6 (GND) | — | W32 | — | 0.5 | OEM-4-J | — | — | — |
| 30 | KNOCK 2- | — | — | — | — | — | — | — | — |
| 31 | KNOCK 2+ | — | — | — | — | — | — | — | — |
| 32 | AIN 16 | — | — | — | — | — | — | — | — |
| 33 | INJECTOR 5 | — | W34 | — | 0.5 | OEM-4-P | — | — | — |
| 34 | INJECTOR 6 | — | W35 | — | 0.5 | OEM-4-Q | — | — | — |
| 4 | AIN 6 | — | W39 | — | 0.5 | OEM-3-C | — | — | — |
| 5 | AIN 7 | — | W40 | — | 0.5 | OEM-3-D | — | — | — |
| 6 | AIN 8 | — | W41 | — | 0.5 | OEM-3-K | — | — | — |
| 7 | GP out 13 (H-BRIDGE 1) | — | — | — | — | — | — | — | — |
| 8 | GP out 14 (H-BRIDGE 1) | — | — | — | — | — | — | — | — |
| 9 | Engine gnd | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
MAXXECUGEN2T-MX3
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | GP out 15 (H-BRIDGE 2) | — | — | — | — | — | — | — | — |
| 10 | WBO2 sensor 2 VS | — | — | — | — | — | — | — | — |
| 11 | WBO2 sensor 2 COM/VREF | — | — | — | — | — | — | — | — |
| 12 | GP Out 8 (GND) / WBO2 Sensor 2 H- | — | W33 | — | 0.5 | OEM-4-O | — | — | — |
| 14 | GP OUT 9 (12V) | — | — | — | — | — | — | — | — |
| 15 | GP OUT 10 (12V) | — | — | — | — | — | — | — | — |
| 16 | GP OUT 11 (12V) | — | — | — | — | — | — | — | — |
| 17 | GP OUT 12 (12V) | — | — | — | — | — | — | — | — |
| 18 | WBO2 sensor 2 RCAL | — | — | — | — | — | — | — | — |
| 19 | WBO2 sensor 2 IP | — | — | — | — | — | — | — | — |
| 2 | GP out 16 (H-BRIDGE 2) | — | — | — | — | — | — | — | — |
| 20 | 12V WBO2 sensor 2 (H+) | — | — | — | — | — | — | — | — |
| 21 | Digital/VR 5 SIGNAL + | — | W45 | — | 0.5 | OEM-1-K | — | — | — |
| 22 | Digital/VR 5 SIGNAL - | — | — | — | — | — | — | — | — |
| 23 | Digital/VR 5 SHIELD | — | — | — | — | — | — | — | — |
| 24 | CAN 2 L | — | — | — | — | — | — | — | — |
| 25 | CAN 2 H | — | — | — | — | — | — | — | — |
| 26 | Digital/VR 6 SIGNAL + | — | W46 | — | 0.5 | OEM-1-L | — | — | — |
| 27 | Digital/VR 6 SIGNAL - | — | — | — | — | — | — | — | — |
| 28 | Digital/VR 6 SHIELD | — | — | — | — | — | — | — | — |
| 29 | INJECTOR 7 | — | W36 | — | 0.5 | OEM-4-T | — | — | — |
| 3 | Ignition 7 | — | — | — | — | — | — | — | — |
| 30 | INJECTOR 8 | — | — | — | — | — | — | — | — |
| 4 | Ignition 8 | — | — | — | — | — | — | — | — |
| 9 | Engine gnd | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
OEM-1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Cooling fan relay (low-side) | — | W26 | — | 0.5 | MAXXECUGEN2T-MX1-5 | — | — | — |
| B | A/C condenser fan relay | — | W27 | — | 0.5 | MAXXECUGEN2T-MX1-6 | — | — | — |
| C | Starter input (12V while cranking) | — | W44 | — | 0.5 | MAXXECUGEN2T-MX1-24 | — | — | — |
| E | Check engine light (MIL) | — | W31 | — | 0.5 | MAXXECUGEN2T-MX1-17 | — | — | — |
| G | A/C clutch relay | — | W28 | — | 0.5 | MAXXECUGEN2T-MX1-7 | — | — | — |
| K | A/C pressure switch (A/C request) | — | W45 | — | 0.5 | MAXXECUGEN2T-MX3-21 | — | — | — |
| L | Clutch switch | — | W46 | — | 0.5 | MAXXECUGEN2T-MX3-26 | — | — | — |
| M | Vehicle speed sensor (VSS) | — | W43 | — | 0.5 | MAXXECUGEN2T-MX1-23 | — | — | — |
| Q | Brake switch | — | W47 | — | 0.5 | MAXXECUGEN2T-MX2-14 | — | — | — |
| U | Fuel pump relay (low-side) | — | W29 | — | 0.5 | MAXXECUGEN2T-MX1-8 | — | — | — |
OEM-3
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| B | MAF sensor input | — | W23 | — | 0.5 | MAXXECUGEN2T-MX1-26 | — | — | — |
| C | Front O2 sensor input | — | W39 | — | 0.5 | MAXXECUGEN2T-MX2-4 | — | — | — |
| D | Rear O2 sensor input | — | W40 | — | 0.5 | MAXXECUGEN2T-MX2-5 | — | — | — |
| F | Throttle position (TPS) | — | W24 | — | 0.5 | MAXXECUGEN2T-MX1-27 | — | — | — |
| G | Engine coolant temp (CLT) | — | W25 | — | 0.5 | MAXXECUGEN2T-MX1-28 | — | — | — |
| H | EGR boost sensor | — | W37 | — | 0.5 | MAXXECUGEN2T-MX1-29 | — | — | — |
| I | +5V sensor reference | — | W14 | — | 0.5 | MAXXECUGEN2T-MX1-12 | — | — | — |
| J | EGR valve position sensor | — | W42 | — | 0.5 | MAXXECUGEN2T-MX2-13 | — | — | — |
| K | Intake air temp (IAT) | — | W41 | — | 0.5 | MAXXECUGEN2T-MX2-6 | — | — | — |
| L | Idle switch (closed throttle) | — | W48 | — | 0.5 | MAXXECUGEN2T-MX2-15 | — | — | — |
| M | Front O2 heater control | — | W30 | — | 0.5 | MAXXECUGEN2T-MX2-12 | — | — | — |
| N | EGR boost sensor (2nd channel) | — | W38 | — | 0.5 | MAXXECUGEN2T-MX1-30 | — | — | — |
| O | Sensor ground | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| P | Power steering pressure switch | — | W49 | — | 0.5 | MAXXECUGEN2T-MX2-16 | — | — | — |
OEM-4
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Chassis ground | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| B | ECU power +12V (main relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| C | Chassis ground | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| D | Chassis ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| E | Crank position (CKP) sensor | — | W15 | — | 0.5 | MAXXECUGEN2T-MX1-10 | — | — | — |
| F | CAS SGT (cam trigger) | — | — | — | — | — | — | — | — |
| G | CAS SGC (cam sync) | — | W16 | — | 0.5 | MAXXECUGEN2T-MX1-18 | — | — | — |
| H | Crank pickup timing ground (CKP gnd) | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| I | Permanent +12V (battery) | — | — | — | — | — | — | — | — |
| J | PRC solenoid (FPR control) | — | W32 | — | 0.5 | MAXXECUGEN2T-MX2-3 | — | — | — |
| K | Chassis ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| L | Tachometer output | — | — | — | — | — | — | — | — |
| N | Ignition coil trigger (cyl 1&4) | — | W17 | — | 0.5 | MAXXECUGEN2T-MX1-1 | — | — | — |
| O | EGR vent solenoid | — | W33 | — | 0.5 | MAXXECUGEN2T-MX3-12 | — | — | — |
| P | EGR vacuum solenoid | — | W34 | — | 0.5 | MAXXECUGEN2T-MX2-33 | — | — | — |
| Q | Idle air control (IAC) valve | — | W35 | — | 0.5 | MAXXECUGEN2T-MX2-34 | — | — | — |
| R | Ignition coil trigger (cyl 2&3) | — | W18 | — | 0.5 | MAXXECUGEN2T-MX1-2 | — | — | — |
| T | EVAP purge solenoid | — | W36 | — | 0.5 | MAXXECUGEN2T-MX3-29 | — | — | — |
| U | Injector 1 (cyl 1) | — | W19 | — | 0.5 | MAXXECUGEN2T-MX1-31 | — | — | — |
| V | Injector 2 (cyl 2) | — | W20 | — | 0.5 | MAXXECUGEN2T-MX1-32 | — | — | — |
| W | Injector 3 (cyl 3) | — | W21 | — | 0.5 | MAXXECUGEN2T-MX1-33 | — | — | — |
| X | Injector 4 (cyl 4) | — | W22 | — | 0.5 | MAXXECUGEN2T-MX1-34 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W11 | — | 0.5 | OEM-3-O | — | — | — |
| 1 | — | — | W12 | — | 0.5 | OEM-4-H | — | — | — |
| 1 | — | — | W13 | — | 0.5 | MAXXECUGEN2T-MX1-14 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-4-B | — | — | — |
| 1 | — | — | W2 | — | 0.85 | MAXXECUGEN2T-MX1-25 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | MAXXECUGEN2T-MX2-25 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W4 | — | 0.85 | OEM-4-A | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-4-C | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-4-D | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-4-K | — | — | — |
| 1 | — | — | W8 | — | 0.85 | MAXXECUGEN2T-MX1-9 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | MAXXECUGEN2T-MX2-9 | — | — | — |
| 1 | — | — | W10 | — | 0.85 | MAXXECUGEN2T-MX3-9 | — | — | — |
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 | MAXXECUGEN2T-MX1-5 | GP out 1 (GND) | low_side_out | corroborated | |
| OEM-1-B | A/C condenser fan relay | low_side_out | MAXXECUGEN2T-MX1-6 | GP out 2 (GND) | low_side_out | corroborated | |
| OEM-1-C | Starter input (12V while cranking) | digital_in | MAXXECUGEN2T-MX1-24 | Digital/VR 4 SIGNAL + | digital_in | corroborated | |
| OEM-1-E | Check engine light (MIL) | low_side_out | MAXXECUGEN2T-MX1-17 | GP out 5 (GND) | low_side_out | corroborated | |
| OEM-1-G | A/C clutch relay | low_side_out | MAXXECUGEN2T-MX1-7 | GP out 3 (GND) | low_side_out | corroborated | |
| OEM-1-K | A/C pressure switch (A/C request) | digital_in | MAXXECUGEN2T-MX3-21 | Digital/VR 5 SIGNAL + | digital_in | corroborated | |
| OEM-1-L | Clutch switch | digital_in | MAXXECUGEN2T-MX3-26 | Digital/VR 6 SIGNAL + | digital_in | corroborated | |
| OEM-1-M | Vehicle speed sensor (VSS) | digital_in | MAXXECUGEN2T-MX1-23 | Digital/VR 3 SIGNAL + | digital_in | corroborated | |
| OEM-1-Q | Brake switch | digital_in | MAXXECUGEN2T-MX2-14 | AIN 10 | analog_in | corroborated | |
| OEM-1-U | Fuel pump relay (low-side) | low_side_out | MAXXECUGEN2T-MX1-8 | GP out 4 (GND) | low_side_out | corroborated | |
| OEM-3-B | MAF sensor input | analog_in | MAXXECUGEN2T-MX1-26 | AIN 1 | analog_in | corroborated | |
| OEM-3-C | Front O2 sensor input | lambda_nb_in | MAXXECUGEN2T-MX2-4 | AIN 6 | analog_in | corroborated | |
| OEM-3-D | Rear O2 sensor input | lambda_nb_in | MAXXECUGEN2T-MX2-5 | AIN 7 | analog_in | corroborated | |
| OEM-3-F | Throttle position (TPS) | analog_in | MAXXECUGEN2T-MX1-27 | AIN 2 | analog_in | corroborated | |
| OEM-3-G | Engine coolant temp (CLT) | temp_in | MAXXECUGEN2T-MX1-28 | AIN 3 | analog_in | corroborated | |
| OEM-3-H | EGR boost sensor | analog_in | MAXXECUGEN2T-MX1-29 | AIN 4 | analog_in | corroborated | |
| OEM-3-I | +5V sensor reference | vref | MAXXECUGEN2T-MX1-12 | Digital/VR 1 POWER SUPPLY | vref | corroborated | |
| OEM-3-J | EGR valve position sensor | analog_in | MAXXECUGEN2T-MX2-13 | AIN 9 | analog_in | corroborated | |
| OEM-3-K | Intake air temp (IAT) | temp_in | MAXXECUGEN2T-MX2-6 | AIN 8 | analog_in | corroborated | |
| OEM-3-L | Idle switch (closed throttle) | digital_in | MAXXECUGEN2T-MX2-15 | AIN 11 | analog_in | corroborated | |
| OEM-3-M | Front O2 heater control | low_side_out | MAXXECUGEN2T-MX2-12 | GP OUT 7 / WBO2 Sensor 1 H- | low_side_out | corroborated | |
| OEM-3-N | EGR boost sensor (2nd channel) | analog_in | MAXXECUGEN2T-MX1-30 | AIN 5 | analog_in | corroborated | |
| OEM-3-O | Sensor ground | sensor_ground | MAXXECUGEN2T-MX1-14 | SENSOR GND | sensor_ground | corroborated | |
| OEM-3-P | Power steering pressure switch | digital_in | MAXXECUGEN2T-MX2-16 | AIN 12 | analog_in | corroborated | |
| OEM-4-A | Chassis ground | ground | MAXXECUGEN2T-MX1-9 + MAXXECUGEN2T-MX2-9 + MAXXECUGEN2T-MX3-9 | Engine gnd + Engine gnd + Engine gnd | ground | corroborated | |
| OEM-4-B | ECU power +12V (main relay) | power_in | MAXXECUGEN2T-MX1-25 + MAXXECUGEN2T-MX2-25 | 12V supply 1 + 12V supply 2 | power_in | corroborated | |
| OEM-4-C | Chassis ground | ground | MAXXECUGEN2T-MX1-9 + MAXXECUGEN2T-MX2-9 + MAXXECUGEN2T-MX3-9 | Engine gnd + Engine gnd + Engine gnd | ground | corroborated | |
| OEM-4-D | Chassis ground | ground | MAXXECUGEN2T-MX1-9 + MAXXECUGEN2T-MX2-9 + MAXXECUGEN2T-MX3-9 | Engine gnd + Engine gnd + Engine gnd | ground | corroborated | |
| OEM-4-E | Crank position (CKP) sensor | trigger_in | MAXXECUGEN2T-MX1-10 | Digital/VR 1 SIGNAL + | trigger_in | corroborated | |
| OEM-4-F | CAS SGT (cam trigger) | trigger_in | — | — | — | corroborated | |
| OEM-4-G | CAS SGC (cam sync) | trigger_in | MAXXECUGEN2T-MX1-18 | Digital/VR 2 SIGNAL + | trigger_in | corroborated | |
| OEM-4-H | Crank pickup timing ground (CKP gnd) | sensor_ground | MAXXECUGEN2T-MX1-14 | SENSOR GND | sensor_ground | corroborated | |
| OEM-4-I | Permanent +12V (battery) | power_in | — | — | — | corroborated | |
| OEM-4-J | PRC solenoid (FPR control) | low_side_out | MAXXECUGEN2T-MX2-3 | GP out 6 (GND) | low_side_out | corroborated | |
| OEM-4-K | Chassis ground | ground | MAXXECUGEN2T-MX1-9 + MAXXECUGEN2T-MX2-9 + MAXXECUGEN2T-MX3-9 | Engine gnd + Engine gnd + Engine gnd | ground | corroborated | |
| OEM-4-L | Tachometer output | tacho_out | — | — | — | corroborated | |
| OEM-4-N | Ignition coil trigger (cyl 1&4) | ignition_out | MAXXECUGEN2T-MX1-1 | Ignition 1 | ignition_out | corroborated | |
| OEM-4-O | EGR vent solenoid | low_side_out | MAXXECUGEN2T-MX3-12 | GP Out 8 (GND) / WBO2 Sensor 2 H- | low_side_out | corroborated | |
| OEM-4-P | EGR vacuum solenoid | low_side_out | MAXXECUGEN2T-MX2-33 | INJECTOR 5 | injector_out | corroborated | |
| OEM-4-Q | Idle air control (IAC) valve | low_side_out | MAXXECUGEN2T-MX2-34 | INJECTOR 6 | injector_out | corroborated | |
| OEM-4-R | Ignition coil trigger (cyl 2&3) | ignition_out | MAXXECUGEN2T-MX1-2 | Ignition 2 | ignition_out | corroborated | |
| OEM-4-T | EVAP purge solenoid | low_side_out | MAXXECUGEN2T-MX3-29 | INJECTOR 7 | injector_out | corroborated | |
| OEM-4-U | Injector 1 (cyl 1) | injector_out | MAXXECUGEN2T-MX1-31 | INJECTOR 1 | injector_out | corroborated | |
| OEM-4-V | Injector 2 (cyl 2) | injector_out | MAXXECUGEN2T-MX1-32 | INJECTOR 2 | injector_out | corroborated | |
| OEM-4-W | Injector 3 (cyl 3) | injector_out | MAXXECUGEN2T-MX1-33 | INJECTOR 3 | injector_out | corroborated | |
| OEM-4-X | Injector 4 (cyl 4) | injector_out | MAXXECUGEN2T-MX1-34 | INJECTOR 4 | 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 | MAXXECUGEN2T-MX1-25 | 0.85 | no route | 12V supply 1 | — | |
| W3 | SP-14V-1 | MAXXECUGEN2T-MX2-25 | 0.85 | no route | 12V supply 2 | — | |
| W4 | OEM-4-A | SP-GND-1 | 0.85 | no route | Chassis ground | — | |
| W5 | OEM-4-C | SP-GND-1 | 0.85 | no route | Chassis ground | — | |
| W6 | OEM-4-D | SP-GND-1 | 0.85 | no route | Chassis ground | — | |
| W7 | OEM-4-K | SP-GND-1 | 0.85 | no route | Chassis ground | — | |
| W8 | SP-GND-1 | MAXXECUGEN2T-MX1-9 | 0.85 | no route | Engine gnd | — | |
| W9 | SP-GND-1 | MAXXECUGEN2T-MX2-9 | 0.85 | no route | Engine gnd | — | |
| W10 | SP-GND-1 | MAXXECUGEN2T-MX3-9 | 0.85 | no route | Engine gnd | — | |
| W11 | OEM-3-O | SP-0V-1 | 0.5 | no route | Sensor ground | — | |
| W12 | OEM-4-H | SP-0V-1 | 0.5 | no route | Crank pickup timing ground (CKP gnd) | — | |
| W13 | SP-0V-1 | MAXXECUGEN2T-MX1-14 | 0.5 | no route | SENSOR GND | — | |
| W14 | OEM-3-I | MAXXECUGEN2T-MX1-12 | 0.5 | no route | +5V sensor reference | — | |
| W15 | OEM-4-E | MAXXECUGEN2T-MX1-10 | 0.5 | no route | Crank position (CKP) sensor | — | |
| W16 | OEM-4-G | MAXXECUGEN2T-MX1-18 | 0.5 | no route | CAS SGC (cam sync) | — | |
| W17 | OEM-4-N | MAXXECUGEN2T-MX1-1 | 0.5 | no route | Ignition coil trigger (cyl 1&4) | — | |
| W18 | OEM-4-R | MAXXECUGEN2T-MX1-2 | 0.5 | no route | Ignition coil trigger (cyl 2&3) | — | |
| W19 | OEM-4-U | MAXXECUGEN2T-MX1-31 | 0.5 | no route | Injector 1 (cyl 1) | — | |
| W20 | OEM-4-V | MAXXECUGEN2T-MX1-32 | 0.5 | no route | Injector 2 (cyl 2) | — | |
| W21 | OEM-4-W | MAXXECUGEN2T-MX1-33 | 0.5 | no route | Injector 3 (cyl 3) | — | |
| W22 | OEM-4-X | MAXXECUGEN2T-MX1-34 | 0.5 | no route | Injector 4 (cyl 4) | — | |
| W23 | OEM-3-B | MAXXECUGEN2T-MX1-26 | 0.5 | no route | MAF sensor input | — | |
| W24 | OEM-3-F | MAXXECUGEN2T-MX1-27 | 0.5 | no route | Throttle position (TPS) | — | |
| W25 | OEM-3-G | MAXXECUGEN2T-MX1-28 | 0.5 | no route | Engine coolant temp (CLT) | — | |
| W26 | OEM-1-A | MAXXECUGEN2T-MX1-5 | 0.5 | no route | Cooling fan relay (low-side) | — | |
| W27 | OEM-1-B | MAXXECUGEN2T-MX1-6 | 0.5 | no route | A/C condenser fan relay | — | |
| W28 | OEM-1-G | MAXXECUGEN2T-MX1-7 | 0.5 | no route | A/C clutch relay | — | |
| W29 | OEM-1-U | MAXXECUGEN2T-MX1-8 | 0.5 | no route | Fuel pump relay (low-side) | — | |
| W30 | OEM-3-M | MAXXECUGEN2T-MX2-12 | 0.5 | no route | Front O2 heater control | — | |
| W31 | OEM-1-E | MAXXECUGEN2T-MX1-17 | 0.5 | no route | Check engine light (MIL) | — | |
| W32 | OEM-4-J | MAXXECUGEN2T-MX2-3 | 0.5 | no route | PRC solenoid (FPR control) | — | |
| W33 | OEM-4-O | MAXXECUGEN2T-MX3-12 | 0.5 | no route | EGR vent solenoid | — | |
| W34 | OEM-4-P | MAXXECUGEN2T-MX2-33 | 0.5 | no route | EGR vacuum solenoid | — | |
| W35 | OEM-4-Q | MAXXECUGEN2T-MX2-34 | 0.5 | no route | Idle air control (IAC) valve | — | |
| W36 | OEM-4-T | MAXXECUGEN2T-MX3-29 | 0.5 | no route | EVAP purge solenoid | — | |
| W37 | OEM-3-H | MAXXECUGEN2T-MX1-29 | 0.5 | no route | EGR boost sensor | — | |
| W38 | OEM-3-N | MAXXECUGEN2T-MX1-30 | 0.5 | no route | EGR boost sensor (2nd channel) | — | |
| W39 | OEM-3-C | MAXXECUGEN2T-MX2-4 | 0.5 | no route | Front O2 sensor input | — | |
| W40 | OEM-3-D | MAXXECUGEN2T-MX2-5 | 0.5 | no route | Rear O2 sensor input | — | |
| W41 | OEM-3-K | MAXXECUGEN2T-MX2-6 | 0.5 | no route | Intake air temp (IAT) | — | |
| W42 | OEM-3-J | MAXXECUGEN2T-MX2-13 | 0.5 | no route | EGR valve position sensor | — | |
| W43 | OEM-1-M | MAXXECUGEN2T-MX1-23 | 0.5 | no route | Vehicle speed sensor (VSS) | — | |
| W44 | OEM-1-C | MAXXECUGEN2T-MX1-24 | 0.5 | no route | Starter input (12V while cranking) | — | |
| W45 | OEM-1-K | MAXXECUGEN2T-MX3-21 | 0.5 | no route | A/C pressure switch (A/C request) | — | |
| W46 | OEM-1-L | MAXXECUGEN2T-MX3-26 | 0.5 | no route | Clutch switch | — | |
| W47 | OEM-1-Q | MAXXECUGEN2T-MX2-14 | 0.5 | no route | Brake switch | — | |
| W48 | OEM-3-L | MAXXECUGEN2T-MX2-15 | 0.5 | no route | Idle switch (closed throttle) | — | |
| W49 | OEM-3-P | MAXXECUGEN2T-MX2-16 | 0.5 | no route | Power steering pressure switch | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| No configured channels. | |||||||
Findings
Open (10)
| 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 | NET_FAMILY | OEM-1-Q ↔ MAXXECUGEN2T-MX2-14 | OEM-1-Q "Brake switch" [digital_in] is wired to MAXXECUGEN2T-MX2-14 "AIN 10" [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. |
| warn | NET_FAMILY | OEM-3-L ↔ MAXXECUGEN2T-MX2-15 | OEM-3-L "Idle switch (closed throttle)" [digital_in] is wired to MAXXECUGEN2T-MX2-15 "AIN 11" [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. |
| warn | NET_FAMILY | OEM-3-P ↔ MAXXECUGEN2T-MX2-16 | OEM-3-P "Power steering pressure switch" [digital_in] is wired to MAXXECUGEN2T-MX2-16 "AIN 12" [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-3-G ↔ MAXXECUGEN2T-MX1-28 | OEM-3-G "Engine coolant temp (CLT)" [temp_in] is wired to MAXXECUGEN2T-MX1-28 "AIN 3" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | NET_FAMILY | OEM-3-K ↔ MAXXECUGEN2T-MX2-6 | OEM-3-K "Intake air temp (IAT)" [temp_in] is wired to MAXXECUGEN2T-MX2-6 "AIN 8" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | NET_FAMILY | OEM-4-P ↔ MAXXECUGEN2T-MX2-33 | OEM-4-P "EGR vacuum solenoid" [low_side_out] is wired to MAXXECUGEN2T-MX2-33 "INJECTOR 5" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-4-Q ↔ MAXXECUGEN2T-MX2-34 | OEM-4-Q "Idle air control (IAC) valve" [low_side_out] is wired to MAXXECUGEN2T-MX2-34 "INJECTOR 6" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-4-T ↔ MAXXECUGEN2T-MX3-29 | OEM-4-T "EVAP purge solenoid" [low_side_out] is wired to MAXXECUGEN2T-MX3-29 "INJECTOR 7" [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-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
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 MaxxECU MaxxECU GEN2 TRACK Not wired: - OEM-4 I: Permanent +12V (battery): MaxxECU MaxxECU GEN2 TRACK has no battery-constant input; not needed - OEM-4 L: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on MaxxECU MaxxECU GEN2 TRACK - MAXXECUGEN2T-MX2 24: 12V supply 3: not fed (the stock ECU has no ignition-sense pin); feed it from a switched-ignition source
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 | MaxxECU GEN2 pinout (RACE MX1–MX4 / TRACK MX1–MX3) | http://www.maxxecu.com/webhelp/wirings-maxxecu_gen2_pinout.html | archive | 2026-10-05 | f689b8b6b08f |
| 3 | community_copy | Mellens.net: 1996 Mazda Miata wiring diagrams (FSM-derived) | http://www.mellens.net/mazda/mazda_miata_extra_manual/1996_wiring.pdf | — | — | — |