MX-5 Miata NA8 1994-97 (BP-ZE, 1.8) → MaxxECU MaxxECU RACE REV9+ (auto)
MX-5 Miata NA8 1994-97 (BP-ZE, 1.8) — MaxxECU — MaxxECU RACE
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 2026-10-08
Before you start
| Status | draft · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | none |
| Size of the job | 38 wires · 7 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 | MAXXECURACE-C1-M4 | 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 | MAXXECURACE-C1-L4 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | MAXXECURACE-C2-G4 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-2-F | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-0V-1 | MAXXECURACE-C1-H1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-0V-1 | MAXXECURACE-C1-H2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-2-K | MAXXECURACE-C1-G1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-2-E | MAXXECURACE-C1-H3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-2-G | MAXXECURACE-C1-H4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-1-G | MAXXECURACE-C1-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-1-H | MAXXECURACE-C1-A3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-2-U | MAXXECURACE-C1-K1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-2-V | MAXXECURACE-C1-K2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-2-Y | MAXXECURACE-C1-M1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-2-Z | MAXXECURACE-C1-M2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-1-J | MAXXECURACE-C1-B4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-1-R | MAXXECURACE-C1-C4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-2-S | MAXXECURACE-C1-D4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-2-T | MAXXECURACE-C1-E4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-2-W | MAXXECURACE-C1-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-1-E | MAXXECURACE-C1-B1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-2-R | MAXXECURACE-C1-C1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-2-X | MAXXECURACE-C1-A4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-2-O | MAXXECURACE-C1-J3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-2-M | MAXXECURACE-C1-G2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-2-N | MAXXECURACE-C1-J4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-2-Q | MAXXECURACE-C1-J1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-2-P | MAXXECURACE-C1-J2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-1-M | MAXXECURACE-C1-K3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-1-C | MAXXECURACE-C1-K4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-1-P | MAXXECURACE-C2-F3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-1-Q | MAXXECURACE-C2-F4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-1-V | MAXXECURACE-C2-G3 | 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 | MAXXECURACE-C1-M4 | MAXXECURACE-C1-H1 | open (OL) | +12 V supply must not touch sensor ground | |
| 2 | MAXXECURACE-C1-M4 | MAXXECURACE-C1-L4 | open (OL) | +12 V supply must not touch power ground | |
| 3 | MAXXECURACE-C1-H1 | MAXXECURACE-C1-G1 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 4 | MAXXECURACE-C1-L4 | MAXXECURACE-C1-G1 | open (OL) | power ground must not touch 5 V sensor reference | |
| 5 | MAXXECURACE-C1-M4 | MAXXECURACE-C1-G1 | open (OL) | +12 V supply must not touch 5 V sensor reference |
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
MAXXECURACE-C1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A1 | GPO 5 | — | W25 | — | 0.5 | OEM-2-W | — | — | — |
| A2 | IGN 1 | — | W15 | — | 0.5 | OEM-1-G | — | — | — |
| A3 | IGN 2 | — | W16 | — | 0.5 | OEM-1-H | — | — | — |
| A4 | GPO 8/TACHO | — | W28 | — | 0.5 | OEM-2-X | — | — | — |
| B1 | GPO 6 | — | W26 | — | 0.5 | OEM-1-E | — | — | — |
| B2 | IGN 3 | — | — | — | — | — | — | — | — |
| B3 | IGN 4 | — | — | — | — | — | — | — | — |
| B4 | GPO 1 | — | W21 | — | 0.5 | OEM-1-J | — | — | — |
| C1 | GPO 7 | — | W27 | — | 0.5 | OEM-2-R | — | — | — |
| C2 | IGN 5 | — | — | — | — | — | — | — | — |
| C3 | IGN 6 | — | — | — | — | — | — | — | — |
| C4 | GPO 2 | — | W22 | — | 0.5 | OEM-1-R | — | — | — |
| D1 | WBO2 Heater- | — | — | — | — | — | — | — | — |
| D2 | IGN 7 | — | — | — | — | — | — | — | — |
| D3 | IGN 8 | — | — | — | — | — | — | — | — |
| D4 | GPO 3 | — | W23 | — | 0.5 | OEM-2-S | — | — | — |
| E1 | CAN H | — | — | — | — | — | — | — | — |
| E2 | CAN L | — | — | — | — | — | — | — | — |
| E3 | GND Shield | — | — | — | — | — | — | — | — |
| E4 | GPO 4 | — | W24 | — | 0.5 | OEM-2-T | — | — | — |
| F1 | CLT | — | — | — | — | — | — | — | — |
| F2 | IAT | — | — | — | — | — | — | — | — |
| F3 | WBO2 VREF | — | — | — | — | — | — | — | — |
| F4 | WBO2 VS | — | — | — | — | — | — | — | — |
| G1 | +5V sensor supply | — | W12 | — | 0.5 | OEM-2-K | — | — | — |
| G2 | TPS/AIN | — | W30 | — | 0.5 | OEM-2-M | — | — | — |
| G3 | WBO2 IP | — | — | — | — | — | — | — | — |
| G4 | WBO2 RCAL | — | — | — | — | — | — | — | — |
| H1 | Sensor GND | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| H2 | Trigger GND | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| H3 | TRIGGER | — | W13 | — | 0.5 | OEM-2-E | — | — | — |
| H4 | HOME | — | W14 | — | 0.5 | OEM-2-G | — | — | — |
| J1 | AIN 1 (temperature) | — | W32 | — | 0.5 | OEM-2-Q | — | — | — |
| J2 | AIN 2 (temperature) | — | W33 | — | 0.5 | OEM-2-P | — | — | — |
| J3 | AIN 3 (0-5V) | — | W29 | — | 0.5 | OEM-2-O | — | — | — |
| J4 | AIN 4 (0-5V) | — | W31 | — | 0.5 | OEM-2-N | — | — | — |
| K1 | INJ 1 | — | W17 | — | 0.5 | OEM-2-U | — | — | — |
| K2 | INJ 2 | — | W18 | — | 0.5 | OEM-2-V | — | — | — |
| K3 | DIN/VR 1 | — | W34 | — | 0.5 | OEM-1-M | — | — | — |
| K4 | DIN/VR 2 | — | W35 | — | 0.5 | OEM-1-C | — | — | — |
| L1 | INJ 8 | — | — | — | — | — | — | — | — |
| L2 | INJ 7 | — | — | — | — | — | — | — | — |
| L3 | INJ 6 | — | — | — | — | — | — | — | — |
| L4 | Engine GND | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| M1 | INJ 3 | — | W19 | — | 0.5 | OEM-2-Y | — | — | — |
| M2 | INJ 4 | — | W20 | — | 0.5 | OEM-2-Z | — | — | — |
| M3 | INJ 5 | — | — | — | — | — | — | — | — |
| M4 | +12V ECU power supply | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
MAXXECURACE-C2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A1 | EGT 5+ | — | — | — | — | — | — | — | — |
| A2 | EGT 6+ | — | — | — | — | — | — | — | — |
| A3 | EGT 7+ | — | — | — | — | — | — | — | — |
| A4 | EGT 8+ | — | — | — | — | — | — | — | — |
| B1 | EGT 5- | — | — | — | — | — | — | — | — |
| B2 | EGT 6- | — | — | — | — | — | — | — | — |
| B3 | EGT 7- | — | — | — | — | — | — | — | — |
| B4 | EGT 8- | — | — | — | — | — | — | — | — |
| C1 | EGT 1+ | — | — | — | — | — | — | — | — |
| C2 | EGT 2+ | — | — | — | — | — | — | — | — |
| C3 | EGT 3+ | — | — | — | — | — | — | — | — |
| C4 | EGT 4+ | — | — | — | — | — | — | — | — |
| D1 | EGT 1- | — | — | — | — | — | — | — | — |
| D2 | EGT 2- | — | — | — | — | — | — | — | — |
| D3 | EGT 3- | — | — | — | — | — | — | — | — |
| D4 | EGT 4- | — | — | — | — | — | — | — | — |
| E1 | KNOCK GND | — | — | — | — | — | — | — | — |
| E2 | Knock 1 | — | — | — | — | — | — | — | — |
| E3 | Knock 2 | — | — | — | — | — | — | — | — |
| E4 | AIN 6 (0-5V) | — | — | — | — | — | — | — | — |
| F1 | AIN 7 (0-5V) | — | — | — | — | — | — | — | — |
| F2 | AIN 8 (0-5V) | — | — | — | — | — | — | — | — |
| F3 | DIN/VR 4 | — | W36 | — | 0.5 | OEM-1-P | — | — | — |
| F4 | DIN/VR 5 | — | W37 | — | 0.5 | OEM-1-Q | — | — | — |
| G1 | GPO 15 (+12V) | — | — | — | — | — | — | — | — |
| G2 | GPO 16 (+12V) | — | — | — | — | — | — | — | — |
| G3 | AIN 5 (0-5V) | — | W38 | — | 0.5 | OEM-1-V | — | — | — |
| G4 | ENGINE GROUND | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| H1 | MOTOR 2+ | — | — | — | — | — | — | — | — |
| H2 | MOTOR 1- | — | — | — | — | — | — | — | — |
| H3 | MOTOR 2- | — | — | — | — | — | — | — | — |
| H4 | MOTOR 1+ | — | — | — | — | — | — | — | — |
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 | — | W35 | — | 0.5 | MAXXECURACE-C1-K4 | — | — | — |
| E | Malfunction indicator lamp (MIL) | — | W26 | — | 0.5 | MAXXECURACE-C1-B1 | — | — | — |
| G | Ignition 1 (coils 1+4, wasted spark) | — | W15 | — | 0.5 | MAXXECURACE-C1-A2 | — | — | — |
| H | Ignition 2 (coils 2+3, wasted spark) | — | W16 | — | 0.5 | MAXXECURACE-C1-A3 | — | — | — |
| J | A/C relay | — | W21 | — | 0.5 | MAXXECURACE-C1-B4 | — | — | — |
| M | Vehicle speed | — | W34 | — | 0.5 | MAXXECURACE-C1-K3 | — | — | — |
| P | Power steering pressure switch | — | W36 | — | 0.5 | MAXXECURACE-C2-F3 | — | — | — |
| Q | A/C request | — | W37 | — | 0.5 | MAXXECURACE-C2-F4 | — | — | — |
| R | Cooling fan relay | — | W22 | — | 0.5 | MAXXECURACE-C1-C4 | — | — | — |
| V | Neutral/clutch switch | — | W38 | — | 0.5 | MAXXECURACE-C2-G3 | — | — | — |
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) | — | W13 | — | 0.5 | MAXXECURACE-C1-H3 | — | — | — |
| F | MAF ground | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| G | Cam position (CAS G) | — | W14 | — | 0.5 | MAXXECURACE-C1-H4 | — | — | — |
| I | Tachometer output | — | — | — | — | — | — | — | — |
| K | +5V sensor supply | — | W12 | — | 0.5 | MAXXECURACE-C1-G1 | — | — | — |
| M | Throttle position (TPS) | — | W30 | — | 0.5 | MAXXECURACE-C1-G2 | — | — | — |
| N | O2 sensor | — | W31 | — | 0.5 | MAXXECURACE-C1-J4 | — | — | — |
| O | Mass air flow (MAF) | — | W29 | — | 0.5 | MAXXECURACE-C1-J3 | — | — | — |
| P | Intake air temperature (IAT) | — | W33 | — | 0.5 | MAXXECURACE-C1-J2 | — | — | — |
| Q | Coolant temperature (ECT) | — | W32 | — | 0.5 | MAXXECURACE-C1-J1 | — | — | — |
| R | PRC solenoid (fuel pressure regulator) | — | W27 | — | 0.5 | MAXXECURACE-C1-C1 | — | — | — |
| S | Condenser fan relay | — | W23 | — | 0.5 | MAXXECURACE-C1-D4 | — | — | — |
| T | Fuel pump relay | — | W24 | — | 0.5 | MAXXECURACE-C1-E4 | — | — | — |
| U | Injector 1 | — | W17 | — | 0.5 | MAXXECURACE-C1-K1 | — | — | — |
| V | Injector 2 | — | W18 | — | 0.5 | MAXXECURACE-C1-K2 | — | — | — |
| W | ISC solenoid | — | W25 | — | 0.5 | MAXXECURACE-C1-A1 | — | — | — |
| X | Evap purge solenoid | — | W28 | — | 0.5 | MAXXECURACE-C1-A4 | — | — | — |
| Y | Injector 3 | — | W19 | — | 0.5 | MAXXECURACE-C1-M1 | — | — | — |
| Z | Injector 4 | — | W20 | — | 0.5 | MAXXECURACE-C1-M2 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W9 | — | 0.5 | OEM-2-F | — | — | — |
| 1 | — | — | W10 | — | 0.5 | MAXXECURACE-C1-H1 | — | — | — |
| 1 | — | — | W11 | — | 0.5 | MAXXECURACE-C1-H2 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-1-B | — | — | — |
| 1 | — | — | W2 | — | 0.85 | MAXXECURACE-C1-M4 | — | — | — |
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 | MAXXECURACE-C1-L4 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | MAXXECURACE-C2-G4 | — | — | — |
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 | MAXXECURACE-C1-M4 | +12V ECU power supply | power_in | single_source | |
| OEM-1-C | Start signal | digital_in | MAXXECURACE-C1-K4 | DIN/VR 2 | digital_in | single_source | |
| OEM-1-E | Malfunction indicator lamp (MIL) | low_side_out | MAXXECURACE-C1-B1 | GPO 6 | low_side_out | single_source | |
| OEM-1-G | Ignition 1 (coils 1+4, wasted spark) | ignition_out | MAXXECURACE-C1-A2 | IGN 1 | ignition_out | single_source | |
| OEM-1-H | Ignition 2 (coils 2+3, wasted spark) | ignition_out | MAXXECURACE-C1-A3 | IGN 2 | ignition_out | single_source | |
| OEM-1-J | A/C relay | low_side_out | MAXXECURACE-C1-B4 | GPO 1 | low_side_out | single_source | |
| OEM-1-M | Vehicle speed | digital_in | MAXXECURACE-C1-K3 | DIN/VR 1 | digital_in | single_source | |
| OEM-1-P | Power steering pressure switch | digital_in | MAXXECURACE-C2-F3 | DIN/VR 4 | digital_in | single_source | |
| OEM-1-Q | A/C request | digital_in | MAXXECURACE-C2-F4 | DIN/VR 5 | digital_in | single_source | |
| OEM-1-R | Cooling fan relay | low_side_out | MAXXECURACE-C1-C4 | GPO 2 | low_side_out | single_source | |
| OEM-1-V | Neutral/clutch switch | digital_in | MAXXECURACE-C2-G3 | AIN 5 (0-5V) | analog_in | single_source | |
| OEM-2-A | Power ground | ground | MAXXECURACE-C1-L4 + MAXXECURACE-C2-G4 | Engine GND + ENGINE GROUND | ground | single_source | |
| OEM-2-B | Power ground | ground | MAXXECURACE-C1-L4 + MAXXECURACE-C2-G4 | Engine GND + ENGINE GROUND | ground | single_source | |
| OEM-2-C | Power ground | ground | MAXXECURACE-C1-L4 + MAXXECURACE-C2-G4 | Engine GND + ENGINE GROUND | ground | single_source | |
| OEM-2-D | Power ground | ground | MAXXECURACE-C1-L4 + MAXXECURACE-C2-G4 | Engine GND + ENGINE GROUND | ground | single_source | |
| OEM-2-E | Crank position (CAS NE) | trigger_in | MAXXECURACE-C1-H3 | TRIGGER | trigger_in | single_source | |
| OEM-2-F | MAF ground | sensor_ground | MAXXECURACE-C1-H1 + MAXXECURACE-C1-H2 | Sensor GND + Trigger GND | sensor_ground | single_source | |
| OEM-2-G | Cam position (CAS G) | trigger_in | MAXXECURACE-C1-H4 | HOME | trigger_in | single_source | |
| OEM-2-I | Tachometer output | tacho_out | — | — | — | single_source | |
| OEM-2-K | +5V sensor supply | vref | MAXXECURACE-C1-G1 | +5V sensor supply | vref | single_source | |
| OEM-2-M | Throttle position (TPS) | analog_in | MAXXECURACE-C1-G2 | TPS/AIN | analog_in | single_source | |
| OEM-2-N | O2 sensor | lambda_nb_in | MAXXECURACE-C1-J4 | AIN 4 (0-5V) | analog_in | single_source | |
| OEM-2-O | Mass air flow (MAF) | analog_in | MAXXECURACE-C1-J3 | AIN 3 (0-5V) | analog_in | single_source | |
| OEM-2-P | Intake air temperature (IAT) | temp_in | MAXXECURACE-C1-J2 | AIN 2 (temperature) | temp_in | single_source | |
| OEM-2-Q | Coolant temperature (ECT) | temp_in | MAXXECURACE-C1-J1 | AIN 1 (temperature) | temp_in | single_source | |
| OEM-2-R | PRC solenoid (fuel pressure regulator) | low_side_out | MAXXECURACE-C1-C1 | GPO 7 | low_side_out | single_source | |
| OEM-2-S | Condenser fan relay | low_side_out | MAXXECURACE-C1-D4 | GPO 3 | low_side_out | single_source | |
| OEM-2-T | Fuel pump relay | low_side_out | MAXXECURACE-C1-E4 | GPO 4 | low_side_out | single_source | |
| OEM-2-U | Injector 1 | injector_out | MAXXECURACE-C1-K1 | INJ 1 | injector_out | single_source | |
| OEM-2-V | Injector 2 | injector_out | MAXXECURACE-C1-K2 | INJ 2 | injector_out | single_source | |
| OEM-2-W | ISC solenoid | low_side_out | MAXXECURACE-C1-A1 | GPO 5 | low_side_out | single_source | |
| OEM-2-X | Evap purge solenoid | low_side_out | MAXXECURACE-C1-A4 | GPO 8/TACHO | low_side_out | single_source | |
| OEM-2-Y | Injector 3 | injector_out | MAXXECURACE-C1-M1 | INJ 3 | injector_out | single_source | |
| OEM-2-Z | Injector 4 | injector_out | MAXXECURACE-C1-M2 | INJ 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 | MAXXECURACE-C1-M4 | 0.85 | no route | +12V ECU power supply | — | |
| 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 | MAXXECURACE-C1-L4 | 0.85 | no route | Engine GND | — | |
| W8 | SP-GND-1 | MAXXECURACE-C2-G4 | 0.85 | no route | ENGINE GROUND | — | |
| W9 | OEM-2-F | SP-0V-1 | 0.5 | no route | MAF ground | — | |
| W10 | SP-0V-1 | MAXXECURACE-C1-H1 | 0.5 | no route | Sensor GND | — | |
| W11 | SP-0V-1 | MAXXECURACE-C1-H2 | 0.5 | no route | Trigger GND | — | |
| W12 | OEM-2-K | MAXXECURACE-C1-G1 | 0.5 | no route | +5V sensor supply | — | |
| W13 | OEM-2-E | MAXXECURACE-C1-H3 | 0.5 | no route | Crank position (CAS NE) | — | |
| W14 | OEM-2-G | MAXXECURACE-C1-H4 | 0.5 | no route | Cam position (CAS G) | — | |
| W15 | OEM-1-G | MAXXECURACE-C1-A2 | 0.5 | no route | Ignition 1 (coils 1+4, wasted spark) | — | |
| W16 | OEM-1-H | MAXXECURACE-C1-A3 | 0.5 | no route | Ignition 2 (coils 2+3, wasted spark) | — | |
| W17 | OEM-2-U | MAXXECURACE-C1-K1 | 0.5 | no route | Injector 1 | — | |
| W18 | OEM-2-V | MAXXECURACE-C1-K2 | 0.5 | no route | Injector 2 | — | |
| W19 | OEM-2-Y | MAXXECURACE-C1-M1 | 0.5 | no route | Injector 3 | — | |
| W20 | OEM-2-Z | MAXXECURACE-C1-M2 | 0.5 | no route | Injector 4 | — | |
| W21 | OEM-1-J | MAXXECURACE-C1-B4 | 0.5 | no route | A/C relay | — | |
| W22 | OEM-1-R | MAXXECURACE-C1-C4 | 0.5 | no route | Cooling fan relay | — | |
| W23 | OEM-2-S | MAXXECURACE-C1-D4 | 0.5 | no route | Condenser fan relay | — | |
| W24 | OEM-2-T | MAXXECURACE-C1-E4 | 0.5 | no route | Fuel pump relay | — | |
| W25 | OEM-2-W | MAXXECURACE-C1-A1 | 0.5 | no route | ISC solenoid | — | |
| W26 | OEM-1-E | MAXXECURACE-C1-B1 | 0.5 | no route | Malfunction indicator lamp (MIL) | — | |
| W27 | OEM-2-R | MAXXECURACE-C1-C1 | 0.5 | no route | PRC solenoid (fuel pressure regulator) | — | |
| W28 | OEM-2-X | MAXXECURACE-C1-A4 | 0.5 | no route | Evap purge solenoid | — | |
| W29 | OEM-2-O | MAXXECURACE-C1-J3 | 0.5 | no route | Mass air flow (MAF) | — | |
| W30 | OEM-2-M | MAXXECURACE-C1-G2 | 0.5 | no route | Throttle position (TPS) | — | |
| W31 | OEM-2-N | MAXXECURACE-C1-J4 | 0.5 | no route | O2 sensor | — | |
| W32 | OEM-2-Q | MAXXECURACE-C1-J1 | 0.5 | no route | Coolant temperature (ECT) | — | |
| W33 | OEM-2-P | MAXXECURACE-C1-J2 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W34 | OEM-1-M | MAXXECURACE-C1-K3 | 0.5 | no route | Vehicle speed | — | |
| W35 | OEM-1-C | MAXXECURACE-C1-K4 | 0.5 | no route | Start signal | — | |
| W36 | OEM-1-P | MAXXECURACE-C2-F3 | 0.5 | no route | Power steering pressure switch | — | |
| W37 | OEM-1-Q | MAXXECURACE-C2-F4 | 0.5 | no route | A/C request | — | |
| W38 | OEM-1-V | MAXXECURACE-C2-G3 | 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 |
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| No configured channels. | |||||||
Findings
Open (7)
| Severity | Code | Subject | Message |
|---|---|---|---|
| warn | LOAD_UNKNOWN | MAXXECURACE-C1-A1 | MAXXECURACE-C1-A1 "GPO 5" drives OEM-2-W ISC solenoid (load 1.0 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | MAXXECURACE-C1-B4 | MAXXECURACE-C1-B4 "GPO 1" drives OEM-1-J A/C relay (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | MAXXECURACE-C1-C4 | MAXXECURACE-C1-C4 "GPO 2" drives OEM-1-R Cooling fan relay (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | MAXXECURACE-C1-D4 | MAXXECURACE-C1-D4 "GPO 3" drives OEM-2-S Condenser fan relay (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | MAXXECURACE-C1-E4 | MAXXECURACE-C1-E4 "GPO 4" drives OEM-2-T Fuel pump relay (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | NET_FAMILY | OEM-1-V ↔ MAXXECURACE-C2-G3 | OEM-1-V "Neutral/clutch switch" [digital_in] is wired to MAXXECURACE-C2-G3 "AIN 5 (0-5V)" [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 | 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
Fit check: unconfirmed. Confirm these before building: - Trigger pattern for Mazda BP-ZE not found in the ECU's docs (only a modified "MX5 NA cam trigger with missing tooth" entry) 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 RACE has no battery-constant input; not needed - OEM-2 I: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on MaxxECU MaxxECU RACE
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 GEN1 pinout (MINI / STREET / SPORT / V1 / RACE / PRO) | http://www.maxxecu.com/webhelp/wirings-maxxecu_pinout.html | archive | 2026-10-05 | 2e37b6814690 |