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.
Components
| Ref | Kind | Part | Exclude from BOM |
|---|---|---|---|
| MAXXECUSPORT-C1 | connector | ||
| OEM-1 | connector | ||
| OEM-2 | connector | ||
| SP-0V | splice | ||
| SP-14V | splice | ||
| SP-GND | splice |
Create part
Cut list
Lengths need a layout (0 of 39 routed).
| Wire | From / To | Gauge | Signal |
|---|---|---|---|
| W1 | OEM-1-B / SP-14V-1 | 0.85 | ECU power +14V (main relay) |
| W2 | SP-14V-1 / MAXXECUSPORT-C1-M4 | 0.85 | +12V ECU power supply |
| W3 | OEM-2-A / SP-GND-1 | 0.85 | Power ground |
| W4 | OEM-2-B / SP-GND-1 | 0.85 | Power ground |
| W5 | SP-GND-1 / MAXXECUSPORT-C1-L4 | 0.85 | Engine GND |
| W6 | OEM-2-C / SP-0V-1 | 0.5 | Sensor ground (E2) |
| W7 | OEM-2-D / SP-0V-1 | 0.5 | Sensor ground (E2) |
| W8 | OEM-2-F / SP-0V-1 | 0.5 | MAF ground |
| W9 | SP-0V-1 / MAXXECUSPORT-C1-H1 | 0.5 | Sensor GND |
| W10 | SP-0V-1 / MAXXECUSPORT-C1-H2 | 0.5 | Trigger GND |
| W11 | OEM-2-K / MAXXECUSPORT-C1-G1 | 0.5 | +5V sensor supply |
| W12 | OEM-2-E / MAXXECUSPORT-C1-H3 | 0.5 | Crank position (CAS NE) |
| W13 | OEM-2-G / MAXXECUSPORT-C1-H4 | 0.5 | Cam position (CAS G) |
| W14 | OEM-1-G / MAXXECUSPORT-C1-A2 | 0.5 | Ignition 1 (coils 1+4, wasted spark) |
| W15 | OEM-1-H / MAXXECUSPORT-C1-A3 | 0.5 | Ignition 2 (coils 2+3, wasted spark) |
| W16 | OEM-2-U / MAXXECUSPORT-C1-K1 | 0.5 | Injector 1 |
| W17 | OEM-2-V / MAXXECUSPORT-C1-K2 | 0.5 | Injector 2 |
| W18 | OEM-2-Y / MAXXECUSPORT-C1-M1 | 0.5 | Injector 3 |
| W19 | OEM-2-Z / MAXXECUSPORT-C1-M2 | 0.5 | Injector 4 |
| W20 | OEM-2-O / MAXXECUSPORT-C1-J3 | 0.5 | Mass air flow (MAF) |
| W21 | OEM-2-M / MAXXECUSPORT-C1-G2 | 0.5 | Throttle position (TPS) |
| W22 | OEM-2-Q / MAXXECUSPORT-C1-F1 | 0.5 | Coolant temperature (ECT) |
| W23 | OEM-1-J / MAXXECUSPORT-C1-B4 | 0.5 | A/C relay |
| W24 | OEM-1-R / MAXXECUSPORT-C1-C4 | 0.5 | Cooling fan relay |
| W25 | OEM-2-S / MAXXECUSPORT-C1-D4 | 0.5 | Condenser fan relay |
| W26 | OEM-2-T / MAXXECUSPORT-C1-A1 | 0.5 | Fuel pump relay |
| W27 | OEM-1-L / MAXXECUSPORT-C1-B1 | 0.5 | Coolant fan relay |
| W28 | OEM-2-L / MAXXECUSPORT-C1-A4 | 0.5 | Rear defroster relay |
| W29 | OEM-2-W / MAXXECUSPORT-C1-D1 | 0.5 | ISC solenoid |
| W30 | OEM-1-E / MAXXECUSPORT-C1-M3 | 0.5 | Malfunction indicator lamp (MIL) |
| W31 | OEM-2-R / MAXXECUSPORT-C1-L3 | 0.5 | PRC solenoid (fuel pressure regulator) |
| W32 | OEM-2-N / MAXXECUSPORT-C1-J4 | 0.5 | O2 sensor |
| W33 | OEM-2-P / MAXXECUSPORT-C1-F2 | 0.5 | Intake air temperature (IAT) |
| W34 | OEM-1-M / MAXXECUSPORT-C1-K3 | 0.5 | Vehicle speed |
| W35 | OEM-1-C / MAXXECUSPORT-C1-K4 | 0.5 | Start signal |
| W36 | OEM-1-O / MAXXECUSPORT-C1-C1 | 0.5 | Stop light switch |
| W37 | OEM-1-P / MAXXECUSPORT-C1-D2 | 0.5 | Power steering pressure switch |
| W38 | OEM-1-Q / MAXXECUSPORT-C1-D3 | 0.5 | A/C request |
| W39 | OEM-1-V / MAXXECUSPORT-C1-E4 | 0.5 | Neutral/clutch switch |
Bill of materials
No wire parts assigned: 39 wires need a wire part.
| Part number | Manufacturer | Description | Qty | Unit | Unit price | Buy |
|---|---|---|---|---|---|---|
| connector2 lines | ||||||
| 174515-6 | TE | AMP Multilock .040/.070 hybrid 22-pin female harness plug (Miata NA/NB ECU) | 1 | ea | Mouser ↗Digi-Key ↗Amazon ↗ | |
| 174516-6 | TE | AMP Multilock .040/.070 hybrid 26-pin female harness plug (Miata NA/NB ECU) | 1 | ea | Mouser ↗Digi-Key ↗Amazon ↗ | |