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 |
|---|---|---|---|
| FT450-A | connector | ||
| MAIN-R | connector | ||
| NEW-BATT | terminal | ||
| NEW-KEYON | terminal | ||
| OEM-A | connector | ||
| OEM-B | connector | ||
| OEM-C | connector | ||
| OEM-D | connector | ||
| RLY1-R | connector | ||
| SP-0V | splice | ||
| SP-14V | splice | ||
| SP-5V1 | splice | ||
| SP-GND | splice |
Create part
Cut list
Lengths need a layout (0 of 41 routed).
| Wire | From / To | Gauge | Signal |
|---|---|---|---|
| W1 | OEM-B-1 / SP-14V-1 | 0.85 | Power source 1 (main relay) |
| W2 | OEM-B-9 / SP-14V-1 | 0.85 | Power source 2 (main relay) |
| W3 | NEW-KEYON-1 / MAIN-R-COIL+ | 0.5 | Relay coil positive (ignition-switched +12V) |
| W4 | NEW-BATT-1 / MAIN-R-IN | 0.85 | Relay contact input (battery + via main fuse) |
| W5 | MAIN-R-COIL- / SP-GND-1 | 0.5 | Relay coil negative (ECU low-side driver) |
| W6 | MAIN-R-OUT / FT450-A-A13 | 0.85 | Relay contact output (switched +12V bus) |
| W7 | OEM-B-10 / SP-GND-1 | 0.85 | Power ground 2 |
| W8 | OEM-B-2 / SP-GND-1 | 0.85 | Power ground 1 |
| W9 | OEM-B-20 / SP-GND-1 | 0.85 | Ground |
| W10 | OEM-B-22 / SP-GND-1 | 0.85 | Ground |
| W11 | SP-GND-1 / FT450-A-A7 | 0.85 | Power ground |
| W12 | OEM-C-18 / SP-0V-1 | 0.5 | Sensor ground 2 |
| W13 | OEM-C-7 / SP-0V-1 | 0.5 | Sensor ground 1 |
| W14 | SP-0V-1 / FT450-A-A12 | 0.5 | Signal ground |
| W15 | OEM-C-19 / SP-5V1-1 | 0.5 | Sensor 5V supply 1 (MAP) |
| W16 | OEM-C-28 / SP-5V1-1 | 0.5 | Sensor 5V supply 2 |
| W17 | SP-5V1-1 / FT450-A-A14 | 0.5 | +5V sensor supply |
| W18 | OEM-C-20 / FT450-A-A17 | 0.5 | Cam (TDC1) sensor + |
| W19 | OEM-C-21 / SP-0V-1 | 0.5 | Cam (TDC1) sensor − |
| W20 | OEM-C-4 / FT450-A-A8 | 0.5 | Ignition coil 1 |
| W21 | OEM-C-12 / FT450-A-A9 | 0.5 | Ignition coil 2 |
| W22 | OEM-C-13 / FT450-A-A10 | 0.5 | Ignition coil 3 |
| W23 | OEM-C-14 / FT450-A-A11 | 0.5 | Ignition coil 4 |
| W24 | OEM-B-11 / FT450-A-A1 | 0.5 | Injector 1 |
| W25 | OEM-B-3 / FT450-A-A2 | 0.5 | Injector 2 |
| W26 | OEM-B-4 / FT450-A-A1 | 0.5 | Injector 3 |
| W27 | OEM-B-5 / FT450-A-A2 | 0.5 | Injector 4 |
| W28 | OEM-A-15 / FT450-A-A6 | 0.5 | Fuel pump relay (USDM) |
| W29 | OEM-B-12 / RLY1-R-OUT | 0.5 | VTEC solenoid |
| W30 | SP-14V-1 / RLY1-R-IN | 0.5 | Relay contact input (switched +12 V) |
| W31 | SP-14V-1 / RLY1-R-COIL+ | 0.5 | Relay coil positive (switched +12 V) |
| W32 | RLY1-R-COIL- / FT450-A-A3 | 0.5 | Relay coil negative (ECU low-side driver) |
| W33 | OEM-C-17 / FT450-A-A20 | 0.5 | MAP sensor |
| W34 | OEM-C-27 / FT450-A-A21 | 0.5 | Throttle position sensor |
| W35 | OEM-C-26 / FT450-A-A24 | 0.5 | Coolant temp sensor |
| W36 | OEM-A-16 / FT450-A-A4 | 0.5 | Fuel pump relay (JDM) |
| W37 | OEM-A-17 / FT450-A-A5 | 0.5 | A/C clutch relay |
| W38 | OEM-A-23 / FT450-A-A22 | 0.5 | Secondary O2 sensor |
| W39 | OEM-C-15 / FT450-A-A23 | 0.5 | Secondary O2 sensor |
| W40 | OEM-C-16 / FT450-A-A25 | 0.5 | Primary O2 sensor |
| W41 | OEM-C-25 / FT450-A-A26 | 0.5 | Intake air temp sensor |
Bill of materials
No wire parts assigned: 41 wires need a wire part.
| Part number | Manufacturer | Description | Qty | Unit | Unit price | Buy |
|---|---|---|---|---|---|---|
| connector4 lines | ||||||
| 179679-6 | TE | S2000 2000–05 ECU harness plug B (25P, TE 040 Multi-Lock) | 1 | ea | TE Connectivity | |
| 179680-5 | TE | S2000 2000–05 ECU harness plug C (31P, TE 040 Multi-Lock) | 1 | ea | TE Connectivity | |
| 179681-6 | TE | S2000 2000–05 ECU harness plug A (32P, TE 040 Multi-Lock) | 1 | ea | TE Connectivity | |
| S2K-0005-ECU-D | Honda | S2000 2000–05 ECU plug D (P/N unknown) | 1 | ea | Mouser ↗Digi-Key ↗Amazon ↗ | |