MX-5 Miata NA6 1990-93 (B6-ZE, 1.6) → MaxxECU MaxxECU GEN2 RACE (auto)
MX-5 Miata NA6 1990-93 (B6-ZE, 1.6) — MaxxECU — MaxxECU GEN2 RACE
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 | 33 wires · 9 connectors · 2 part lines |
| Tools | Crimp and extraction tools for each terminal family (see Connectors) · wire strippers · multimeter · heat gun + heat-shrink |
| Order of work | 1. Check every part against the parts list. 2. Cut and label every wire (labels: Export → Wire labels). 3. Crimp and pin connector by connector, ticking the build checklist. 4. Run the bench test with nothing plugged in and the battery disconnected. 5. Only then connect the ECU and power up. |
Build checklist
Tick each box as you go. Continuity: meter from end to end, expect under 1 Ω.
| Wire | From | To | Gauge | Colour | Cut | Label | Crimp A | Crimp B | Pin A | Pin B | Continuity |
|---|---|---|---|---|---|---|---|---|---|---|---|
| W1 | OEM-1-B | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | SP-14V-1 | MAXXECUGEN2R-MX1-25 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-14V-1 | MAXXECUGEN2R-MX2-25 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-2-A | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-2-B | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-2-C | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-2-D | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | MAXXECUGEN2R-MX1-9 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | MAXXECUGEN2R-MX2-9 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-GND-1 | MAXXECUGEN2R-MX3-9 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-2-F | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | SP-0V-1 | MAXXECUGEN2R-MX1-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-2-K | MAXXECUGEN2R-MX1-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-2-E | MAXXECUGEN2R-MX1-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-2-G | MAXXECUGEN2R-MX1-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-1-G | MAXXECUGEN2R-MX1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-1-H | MAXXECUGEN2R-MX1-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-2-U | MAXXECUGEN2R-MX1-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-2-V | MAXXECUGEN2R-MX1-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-2-Y | MAXXECUGEN2R-MX1-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-2-Z | MAXXECUGEN2R-MX1-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-1-E | MAXXECUGEN2R-MX1-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-2-I | MAXXECUGEN2R-MX1-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-2-O | MAXXECUGEN2R-MX1-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-2-N | MAXXECUGEN2R-MX1-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-2-Q | MAXXECUGEN2R-MX1-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-2-P | MAXXECUGEN2R-MX1-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-1-C | MAXXECUGEN2R-MX1-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-1-N | MAXXECUGEN2R-MX1-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-1-P | MAXXECUGEN2R-MX4-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-1-Q | MAXXECUGEN2R-MX4-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-1-V | MAXXECUGEN2R-MX4-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-2-L | MAXXECUGEN2R-MX4-28 | 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 | MAXXECUGEN2R-MX1-25 | MAXXECUGEN2R-MX1-14 | open (OL) | +12 V supply must not touch sensor ground | |
| 2 | MAXXECUGEN2R-MX1-25 | MAXXECUGEN2R-MX1-9 | open (OL) | +12 V supply must not touch power ground | |
| 3 | MAXXECUGEN2R-MX1-14 | MAXXECUGEN2R-MX1-12 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 4 | MAXXECUGEN2R-MX1-25 | MAXXECUGEN2R-MX1-12 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 5 | MAXXECUGEN2R-MX1-9 | MAXXECUGEN2R-MX1-12 | open (OL) | power ground must not touch 5 V sensor reference |
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
MAXXECUGEN2R-MX1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Ignition 1 | — | W16 | — | 0.5 | OEM-1-G | — | — | — |
| 10 | Digital/VR 1 SIGNAL + | — | W14 | — | 0.5 | OEM-2-E | — | — | — |
| 11 | Digital/VR 1 SIGNAL - | — | — | — | — | — | — | — | — |
| 12 | Digital/VR 1 POWER SUPPLY | — | W13 | — | 0.5 | OEM-2-K | — | — | — |
| 13 | Digital/VR 1 SHIELD | — | — | — | — | — | — | — | — |
| 14 | SENSOR GND | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 15 | CAN L | — | — | — | — | — | — | — | — |
| 16 | CAN H | — | — | — | — | — | — | — | — |
| 17 | GP out 5 (GND) | — | — | — | — | — | — | — | — |
| 18 | Digital/VR 2 SIGNAL + | — | W15 | — | 0.5 | OEM-2-G | — | — | — |
| 19 | Digital/VR 2 SIGNAL - | — | — | — | — | — | — | — | — |
| 2 | Ignition 2 | — | W17 | — | 0.5 | OEM-1-H | — | — | — |
| 20 | Digital/VR 2 POWER SUPPLY | — | — | — | — | — | — | — | — |
| 21 | Digital/VR 2 SHIELD | — | — | — | — | — | — | — | — |
| 22 | 5V power supply | — | — | — | — | — | — | — | — |
| 23 | Digital/VR 3 SIGNAL + | — | W28 | — | 0.5 | OEM-1-C | — | — | — |
| 24 | Digital/VR 4 SIGNAL + | — | W29 | — | 0.5 | OEM-1-N | — | — | — |
| 25 | 12V supply 1 | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 26 | AIN 1 | — | W24 | — | 0.5 | OEM-2-O | — | — | — |
| 27 | AIN 2 | — | W25 | — | 0.5 | OEM-2-N | — | — | — |
| 28 | AIN 3 | — | W26 | — | 0.5 | OEM-2-Q | — | — | — |
| 29 | AIN 4 | — | W27 | — | 0.5 | OEM-2-P | — | — | — |
| 3 | Ignition 3 | — | — | — | — | — | — | — | — |
| 30 | AIN 5 | — | — | — | — | — | — | — | — |
| 31 | INJECTOR 1 | — | W18 | — | 0.5 | OEM-2-U | — | — | — |
| 32 | INJECTOR 2 | — | W19 | — | 0.5 | OEM-2-V | — | — | — |
| 33 | INJECTOR 3 | — | W20 | — | 0.5 | OEM-2-Y | — | — | — |
| 34 | INJECTOR 4 | — | W21 | — | 0.5 | OEM-2-Z | — | — | — |
| 4 | Ignition 4 | — | — | — | — | — | — | — | — |
| 5 | GP out 1 (GND) | — | W22 | — | 0.5 | OEM-1-E | — | — | — |
| 6 | GP out 2 (GND) | — | W23 | — | 0.5 | OEM-2-I | — | — | — |
| 7 | GP out 3 (GND) | — | — | — | — | — | — | — | — |
| 8 | GP out 4 (GND) | — | — | — | — | — | — | — | — |
| 9 | Engine gnd | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
MAXXECUGEN2R-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- | — | — | — | — | — | — | — | — |
| 13 | AIN 9 | — | — | — | — | — | — | — | — |
| 14 | AIN 10 | — | — | — | — | — | — | — | — |
| 15 | AIN 11 | — | — | — | — | — | — | — | — |
| 16 | AIN 12 | — | — | — | — | — | — | — | — |
| 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) | — | — | — | — | — | — | — | — |
| 30 | KNOCK 2- | — | — | — | — | — | — | — | — |
| 31 | KNOCK 2+ | — | — | — | — | — | — | — | — |
| 32 | AIN 16 | — | — | — | — | — | — | — | — |
| 33 | INJECTOR 5 | — | — | — | — | — | — | — | — |
| 34 | INJECTOR 6 | — | — | — | — | — | — | — | — |
| 4 | AIN 6 | — | — | — | — | — | — | — | — |
| 5 | AIN 7 | — | — | — | — | — | — | — | — |
| 6 | AIN 8 | — | — | — | — | — | — | — | — |
| 7 | GP out 13 (H-BRIDGE 1) | — | — | — | — | — | — | — | — |
| 8 | GP out 14 (H-BRIDGE 1) | — | — | — | — | — | — | — | — |
| 9 | Engine gnd | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
MAXXECUGEN2R-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- | — | — | — | — | — | — | — | — |
| 13 | WBO2 sensor 2 SHIELD | — | — | — | — | — | — | — | — |
| 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 | AIN 17 | — | — | — | — | — | — | — | — |
| 22 | AIN 18 | — | — | — | — | — | — | — | — |
| 23 | AIN 19 | — | — | — | — | — | — | — | — |
| 24 | AIN 20 | — | — | — | — | — | — | — | — |
| 25 | AIN 21 | — | — | — | — | — | — | — | — |
| 26 | AIN 22 | — | — | — | — | — | — | — | — |
| 27 | AIN 23 | — | — | — | — | — | — | — | — |
| 28 | AIN 24 | — | — | — | — | — | — | — | — |
| 29 | INJECTOR 7 | — | — | — | — | — | — | — | — |
| 3 | Ignition 7 | — | — | — | — | — | — | — | — |
| 30 | INJECTOR 8 | — | — | — | — | — | — | — | — |
| 31 | INJECTOR 9 | — | — | — | — | — | — | — | — |
| 32 | INJECTOR 10 | — | — | — | — | — | — | — | — |
| 33 | INJECTOR 11 | — | — | — | — | — | — | — | — |
| 34 | INJECTOR 12 | — | — | — | — | — | — | — | — |
| 4 | Ignition 8 | — | — | — | — | — | — | — | — |
| 5 | Ignition 9 | — | — | — | — | — | — | — | — |
| 6 | Ignition 10 | — | — | — | — | — | — | — | — |
| 7 | Ignition 11 | — | — | — | — | — | — | — | — |
| 8 | Ignition 12 | — | — | — | — | — | — | — | — |
| 9 | Engine gnd | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
MAXXECUGEN2R-MX4
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Digital/VR 5 SHIELD | — | — | — | — | — | — | — | — |
| 10 | EGT 1 + | — | — | — | — | — | — | — | — |
| 11 | EGT 2 + | — | — | — | — | — | — | — | — |
| 12 | EGT 3 + | — | — | — | — | — | — | — | — |
| 13 | EGT 4 + | — | — | — | — | — | — | — | — |
| 14 | EGT 5 + | — | — | — | — | — | — | — | — |
| 15 | EGT 6 + | — | — | — | — | — | — | — | — |
| 16 | EGT 7 + | — | — | — | — | — | — | — | — |
| 17 | EGT 8 + | — | — | — | — | — | — | — | — |
| 18 | EGT 1 - | — | — | — | — | — | — | — | — |
| 19 | EGT 2 - | — | — | — | — | — | — | — | — |
| 2 | Digital/VR 5 SIGNAL - | — | — | — | — | — | — | — | — |
| 20 | EGT 3 - | — | — | — | — | — | — | — | — |
| 21 | EGT 4 - | — | — | — | — | — | — | — | — |
| 22 | EGT 5 - | — | — | — | — | — | — | — | — |
| 23 | EGT 6 - | — | — | — | — | — | — | — | — |
| 24 | EGT 7 - | — | — | — | — | — | — | — | — |
| 25 | EGT 8 - | — | — | — | — | — | — | — | — |
| 26 | Digital/VR 8 SHIELD | — | — | — | — | — | — | — | — |
| 27 | Digital/VR 8 SIGNAL - | — | — | — | — | — | — | — | — |
| 28 | Digital/VR 8 SIGNAL + | — | W33 | — | 0.5 | OEM-2-L | — | — | — |
| 29 | CAN 2 L | — | — | — | — | — | — | — | — |
| 3 | Digital/VR 5 SIGNAL + | — | W30 | — | 0.5 | OEM-1-P | — | — | — |
| 30 | CAN 2 H | — | — | — | — | — | — | — | — |
| 31 | INJECTOR 13 | — | — | — | — | — | — | — | — |
| 32 | INJECTOR 14 | — | — | — | — | — | — | — | — |
| 33 | INJECTOR 15 | — | — | — | — | — | — | — | — |
| 34 | INJECTOR 16 | — | — | — | — | — | — | — | — |
| 4 | Digital/VR 6 SHIELD | — | — | — | — | — | — | — | — |
| 5 | Digital/VR 6 SIGNAL - | — | — | — | — | — | — | — | — |
| 6 | Digital/VR 6 SIGNAL + | — | W31 | — | 0.5 | OEM-1-Q | — | — | — |
| 7 | Digital/VR 7 SHIELD | — | — | — | — | — | — | — | — |
| 8 | Digital/VR 7 SIGNAL - | — | — | — | — | — | — | — | — |
| 9 | Digital/VR 7 SIGNAL + | — | W32 | — | 0.5 | OEM-1-V | — | — | — |
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 | — | W28 | — | 0.5 | MAXXECUGEN2R-MX1-23 | — | — | — |
| E | Malfunction indicator lamp (MIL) | — | W22 | — | 0.5 | MAXXECUGEN2R-MX1-5 | — | — | — |
| G | Ignition 1 (coils 1+4, wasted spark) | — | W16 | — | 0.5 | MAXXECUGEN2R-MX1-1 | — | — | — |
| H | Ignition 2 (coils 2+3, wasted spark) | — | W17 | — | 0.5 | MAXXECUGEN2R-MX1-2 | — | — | — |
| N | Wide-open throttle switch | — | W29 | — | 0.5 | MAXXECUGEN2R-MX1-24 | — | — | — |
| P | Power steering pressure switch | — | W30 | — | 0.5 | MAXXECUGEN2R-MX4-3 | — | — | — |
| Q | A/C request | — | W31 | — | 0.5 | MAXXECUGEN2R-MX4-6 | — | — | — |
| V | Neutral/clutch switch | — | W32 | — | 0.5 | MAXXECUGEN2R-MX4-9 | — | — | — |
OEM-2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Power ground | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| B | Power ground | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| C | Power ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| D | Power ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| E | Crank position (CAS NE) | — | W14 | — | 0.5 | MAXXECUGEN2R-MX1-10 | — | — | — |
| F | AFM ground | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| G | Cam position (CAS G) | — | W15 | — | 0.5 | MAXXECUGEN2R-MX1-18 | — | — | — |
| I | Tachometer output | — | W23 | — | 0.5 | MAXXECUGEN2R-MX1-6 | — | — | — |
| K | +5V sensor supply | — | W13 | — | 0.5 | MAXXECUGEN2R-MX1-12 | — | — | — |
| L | Idle switch (TPS) | — | W33 | — | 0.5 | MAXXECUGEN2R-MX4-28 | — | — | — |
| N | O2 sensor | — | W25 | — | 0.5 | MAXXECUGEN2R-MX1-27 | — | — | — |
| O | Air flow meter (AFM) | — | W24 | — | 0.5 | MAXXECUGEN2R-MX1-26 | — | — | — |
| P | Intake air temperature (IAT) | — | W27 | — | 0.5 | MAXXECUGEN2R-MX1-29 | — | — | — |
| Q | Coolant temperature (ECT) | — | W26 | — | 0.5 | MAXXECUGEN2R-MX1-28 | — | — | — |
| U | Injector 1 | — | W18 | — | 0.5 | MAXXECUGEN2R-MX1-31 | — | — | — |
| V | Injector 2 | — | W19 | — | 0.5 | MAXXECUGEN2R-MX1-32 | — | — | — |
| Y | Injector 3 | — | W20 | — | 0.5 | MAXXECUGEN2R-MX1-33 | — | — | — |
| Z | Injector 4 | — | W21 | — | 0.5 | MAXXECUGEN2R-MX1-34 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W11 | — | 0.5 | OEM-2-F | — | — | — |
| 1 | — | — | W12 | — | 0.5 | MAXXECUGEN2R-MX1-14 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-1-B | — | — | — |
| 1 | — | — | W2 | — | 0.85 | MAXXECUGEN2R-MX1-25 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | MAXXECUGEN2R-MX2-25 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W4 | — | 0.85 | OEM-2-A | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-2-B | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-2-C | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-2-D | — | — | — |
| 1 | — | — | W8 | — | 0.85 | MAXXECUGEN2R-MX1-9 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | MAXXECUGEN2R-MX2-9 | — | — | — |
| 1 | — | — | W10 | — | 0.85 | MAXXECUGEN2R-MX3-9 | — | — | — |
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 | MAXXECUGEN2R-MX1-25 + MAXXECUGEN2R-MX2-25 | 12V supply 1 + 12V supply 2 | power_in | single_source | |
| OEM-1-C | Start signal | digital_in | MAXXECUGEN2R-MX1-23 | Digital/VR 3 SIGNAL + | digital_in | single_source | |
| OEM-1-E | Malfunction indicator lamp (MIL) | low_side_out | MAXXECUGEN2R-MX1-5 | GP out 1 (GND) | low_side_out | single_source | |
| OEM-1-G | Ignition 1 (coils 1+4, wasted spark) | ignition_out | MAXXECUGEN2R-MX1-1 | Ignition 1 | ignition_out | single_source | |
| OEM-1-H | Ignition 2 (coils 2+3, wasted spark) | ignition_out | MAXXECUGEN2R-MX1-2 | Ignition 2 | ignition_out | single_source | |
| OEM-1-N | Wide-open throttle switch | digital_in | MAXXECUGEN2R-MX1-24 | Digital/VR 4 SIGNAL + | digital_in | single_source | |
| OEM-1-P | Power steering pressure switch | digital_in | MAXXECUGEN2R-MX4-3 | Digital/VR 5 SIGNAL + | digital_in | single_source | |
| OEM-1-Q | A/C request | digital_in | MAXXECUGEN2R-MX4-6 | Digital/VR 6 SIGNAL + | digital_in | single_source | |
| OEM-1-V | Neutral/clutch switch | digital_in | MAXXECUGEN2R-MX4-9 | Digital/VR 7 SIGNAL + | digital_in | single_source | |
| OEM-2-A | Power ground | ground | MAXXECUGEN2R-MX1-9 + MAXXECUGEN2R-MX2-9 + MAXXECUGEN2R-MX3-9 | Engine gnd + Engine gnd + Engine gnd | ground | single_source | |
| OEM-2-B | Power ground | ground | MAXXECUGEN2R-MX1-9 + MAXXECUGEN2R-MX2-9 + MAXXECUGEN2R-MX3-9 | Engine gnd + Engine gnd + Engine gnd | ground | single_source | |
| OEM-2-C | Power ground | ground | MAXXECUGEN2R-MX1-9 + MAXXECUGEN2R-MX2-9 + MAXXECUGEN2R-MX3-9 | Engine gnd + Engine gnd + Engine gnd | ground | single_source | |
| OEM-2-D | Power ground | ground | MAXXECUGEN2R-MX1-9 + MAXXECUGEN2R-MX2-9 + MAXXECUGEN2R-MX3-9 | Engine gnd + Engine gnd + Engine gnd | ground | single_source | |
| OEM-2-E | Crank position (CAS NE) | trigger_in | MAXXECUGEN2R-MX1-10 | Digital/VR 1 SIGNAL + | trigger_in | single_source | |
| OEM-2-F | AFM ground | sensor_ground | MAXXECUGEN2R-MX1-14 | SENSOR GND | sensor_ground | single_source | |
| OEM-2-G | Cam position (CAS G) | trigger_in | MAXXECUGEN2R-MX1-18 | Digital/VR 2 SIGNAL + | trigger_in | single_source | |
| OEM-2-I | Tachometer output | tacho_out | MAXXECUGEN2R-MX1-6 | GP out 2 (GND) | low_side_out | single_source | |
| OEM-2-K | +5V sensor supply | vref | MAXXECUGEN2R-MX1-12 | Digital/VR 1 POWER SUPPLY | vref | single_source | |
| OEM-2-L | Idle switch (TPS) | digital_in | MAXXECUGEN2R-MX4-28 | Digital/VR 8 SIGNAL + | digital_in | single_source | |
| OEM-2-N | O2 sensor | lambda_nb_in | MAXXECUGEN2R-MX1-27 | AIN 2 | analog_in | single_source | |
| OEM-2-O | Air flow meter (AFM) | analog_in | MAXXECUGEN2R-MX1-26 | AIN 1 | analog_in | single_source | |
| OEM-2-P | Intake air temperature (IAT) | temp_in | MAXXECUGEN2R-MX1-29 | AIN 4 | analog_in | single_source | |
| OEM-2-Q | Coolant temperature (ECT) | temp_in | MAXXECUGEN2R-MX1-28 | AIN 3 | analog_in | single_source | |
| OEM-2-U | Injector 1 | injector_out | MAXXECUGEN2R-MX1-31 | INJECTOR 1 | injector_out | single_source | |
| OEM-2-V | Injector 2 | injector_out | MAXXECUGEN2R-MX1-32 | INJECTOR 2 | injector_out | single_source | |
| OEM-2-Y | Injector 3 | injector_out | MAXXECUGEN2R-MX1-33 | INJECTOR 3 | injector_out | single_source | |
| OEM-2-Z | Injector 4 | injector_out | MAXXECUGEN2R-MX1-34 | INJECTOR 4 | 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 | MAXXECUGEN2R-MX1-25 | 0.85 | no route | 12V supply 1 | — | |
| W3 | SP-14V-1 | MAXXECUGEN2R-MX2-25 | 0.85 | no route | 12V supply 2 | — | |
| W4 | OEM-2-A | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W5 | OEM-2-B | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W6 | OEM-2-C | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W7 | OEM-2-D | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W8 | SP-GND-1 | MAXXECUGEN2R-MX1-9 | 0.85 | no route | Engine gnd | — | |
| W9 | SP-GND-1 | MAXXECUGEN2R-MX2-9 | 0.85 | no route | Engine gnd | — | |
| W10 | SP-GND-1 | MAXXECUGEN2R-MX3-9 | 0.85 | no route | Engine gnd | — | |
| W11 | OEM-2-F | SP-0V-1 | 0.5 | no route | AFM ground | — | |
| W12 | SP-0V-1 | MAXXECUGEN2R-MX1-14 | 0.5 | no route | SENSOR GND | — | |
| W13 | OEM-2-K | MAXXECUGEN2R-MX1-12 | 0.5 | no route | +5V sensor supply | — | |
| W14 | OEM-2-E | MAXXECUGEN2R-MX1-10 | 0.5 | no route | Crank position (CAS NE) | — | |
| W15 | OEM-2-G | MAXXECUGEN2R-MX1-18 | 0.5 | no route | Cam position (CAS G) | — | |
| W16 | OEM-1-G | MAXXECUGEN2R-MX1-1 | 0.5 | no route | Ignition 1 (coils 1+4, wasted spark) | — | |
| W17 | OEM-1-H | MAXXECUGEN2R-MX1-2 | 0.5 | no route | Ignition 2 (coils 2+3, wasted spark) | — | |
| W18 | OEM-2-U | MAXXECUGEN2R-MX1-31 | 0.5 | no route | Injector 1 | — | |
| W19 | OEM-2-V | MAXXECUGEN2R-MX1-32 | 0.5 | no route | Injector 2 | — | |
| W20 | OEM-2-Y | MAXXECUGEN2R-MX1-33 | 0.5 | no route | Injector 3 | — | |
| W21 | OEM-2-Z | MAXXECUGEN2R-MX1-34 | 0.5 | no route | Injector 4 | — | |
| W22 | OEM-1-E | MAXXECUGEN2R-MX1-5 | 0.5 | no route | Malfunction indicator lamp (MIL) | — | |
| W23 | OEM-2-I | MAXXECUGEN2R-MX1-6 | 0.5 | no route | Tachometer output | — | |
| W24 | OEM-2-O | MAXXECUGEN2R-MX1-26 | 0.5 | no route | Air flow meter (AFM) | — | |
| W25 | OEM-2-N | MAXXECUGEN2R-MX1-27 | 0.5 | no route | O2 sensor | — | |
| W26 | OEM-2-Q | MAXXECUGEN2R-MX1-28 | 0.5 | no route | Coolant temperature (ECT) | — | |
| W27 | OEM-2-P | MAXXECUGEN2R-MX1-29 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W28 | OEM-1-C | MAXXECUGEN2R-MX1-23 | 0.5 | no route | Start signal | — | |
| W29 | OEM-1-N | MAXXECUGEN2R-MX1-24 | 0.5 | no route | Wide-open throttle switch | — | |
| W30 | OEM-1-P | MAXXECUGEN2R-MX4-3 | 0.5 | no route | Power steering pressure switch | — | |
| W31 | OEM-1-Q | MAXXECUGEN2R-MX4-6 | 0.5 | no route | A/C request | — | |
| W32 | OEM-1-V | MAXXECUGEN2R-MX4-9 | 0.5 | no route | Neutral/clutch switch | — | |
| W33 | OEM-2-L | MAXXECUGEN2R-MX4-28 | 0.5 | no route | Idle switch (TPS) | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|---|---|---|---|---|
| connector | 174515-6 | TE | AMP Multilock .040/.070 hybrid 22-pin female harness plug (Miata NA/NB ECU) | 1.000 | ea |
| connector | 174516-6 | TE | AMP Multilock .040/.070 hybrid 26-pin female harness plug (Miata NA/NB ECU) | 1.000 | ea |
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| No configured channels. | |||||||
Findings
Open (3)
| Severity | Code | Subject | Message |
|---|---|---|---|
| info | NET_FAMILY | OEM-2-I ↔ MAXXECUGEN2R-MX1-6 | OEM-2-I "Tachometer output" [tacho_out] is wired to MAXXECUGEN2R-MX1-6 "GP out 2 (GND)" [low_side_out]. Tacho as a low-side output: check the tach needs a pull-up. |
| info | NET_FAMILY | OEM-2-P ↔ MAXXECUGEN2R-MX1-29 | OEM-2-P "Intake air temperature (IAT)" [temp_in] is wired to MAXXECUGEN2R-MX1-29 "AIN 4" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | NET_FAMILY | OEM-2-Q ↔ MAXXECUGEN2R-MX1-28 | OEM-2-Q "Coolant temperature (ECT)" [temp_in] is wired to MAXXECUGEN2R-MX1-28 "AIN 3" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
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: MaxxECU MaxxECU GEN2 RACE has no battery-constant input; not needed - MAXXECUGEN2R-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 | Link G4X MX5X install manual (NA 1.6/1.8) | https://linkecu.com/documentation/MX5X.pdf | archive | 2026-10-05 | b7f730de9f6e |
| 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 |