AP1 2000–03 (F20C) → FuelTech FT450 (auto)
AP1 2000–03 (F20C) — FuelTech — FT450
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 2026-10-11
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 | 5: read the Findings page before cutting any wire |
| Size of the job | 37 wires · 9 connectors · 4 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-B-1 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | OEM-B-9 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-14V-1 | FT450-A-A13 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-B-10 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-B-2 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-B-20 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-B-22 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | FT450-A-A7 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-C-18 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-C-30 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-C-31 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-C-7 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | SP-0V-1 | FT450-A-A12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-C-19 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-C-28 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | SP-5V1-1 | FT450-A-A14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-C-20 | FT450-A-A17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-C-21 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-C-4 | FT450-A-A8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-C-12 | FT450-A-A9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-C-13 | FT450-A-A10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-C-14 | FT450-A-A11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-B-11 | FT450-A-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-B-3 | FT450-A-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-B-4 | FT450-A-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-B-5 | FT450-A-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-A-15 | FT450-A-A6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-A-16 | FT450-A-A3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-A-17 | FT450-A-A4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-A-20 | FT450-A-A5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-C-17 | FT450-A-A20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-C-27 | FT450-A-A21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-A-23 | FT450-A-A22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-C-15 | FT450-A-A23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-C-16 | FT450-A-A25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-C-26 | FT450-A-A24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-C-25 | FT450-A-A26 | 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 | FT450-A-A13 | FT450-A-A12 | open (OL) | +12 V supply must not touch sensor ground | |
| 2 | FT450-A-A13 | FT450-A-A7 | open (OL) | +12 V supply must not touch power ground | |
| 3 | FT450-A-A12 | FT450-A-A14 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 4 | FT450-A-A13 | FT450-A-A14 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 5 | FT450-A-A7 | FT450-A-A14 | open (OL) | power ground must not touch 5 V sensor reference |
If any reading doesn't match, stop and get help before powering up.
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
FT450-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A1 | Injector 1 (Bank A) | — | W23 | — | 0.5 | OEM-B-11 | — | — | — |
| A1 | Injector 1 (Bank A) | — | W25 | — | 0.5 | OEM-B-4 | — | — | — |
| A10 | Ignition 3 | — | W21 | — | 0.5 | OEM-C-13 | — | — | — |
| A11 | Ignition 4 | — | W22 | — | 0.5 | OEM-C-14 | — | — | — |
| A12 | Signal ground | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| A13 | +12V switched | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| A14 | +5V sensor supply | — | W16 | — | 0.5 | SP-5V1-1 | — | — | — |
| A15 | CAN A LOW | — | — | — | — | — | — | — | — |
| A16 | CAN A HIGH | — | — | — | — | — | — | — | — |
| A17 | Phase input (cam) | — | W17 | — | 0.5 | OEM-C-20 | — | — | — |
| A18 | RPM reference (crank -) | — | — | — | — | — | — | — | — |
| A19 | RPM signal (crank +) | — | — | — | — | — | — | — | — |
| A2 | Injector 2 (Bank A) | — | W24 | — | 0.5 | OEM-B-3 | — | — | — |
| A2 | Injector 2 (Bank A) | — | W26 | — | 0.5 | OEM-B-5 | — | — | — |
| A20 | White input 1 | — | W31 | — | 0.5 | OEM-C-17 | — | — | — |
| A21 | White input 2 | — | W32 | — | 0.5 | OEM-C-27 | — | — | — |
| A22 | White input 3 (TPS) | — | W33 | — | 0.5 | OEM-A-23 | — | — | — |
| A23 | White input 4 (oil pressure) | — | W34 | — | 0.5 | OEM-C-15 | — | — | — |
| A24 | White input 5 (water temp) | — | W36 | — | 0.5 | OEM-C-26 | — | — | — |
| A25 | White input 6 (fuel pressure) | — | W35 | — | 0.5 | OEM-C-16 | — | — | — |
| A26 | White input 7 (air temp) | — | W37 | — | 0.5 | OEM-C-25 | — | — | — |
| A3 | Aux 1 | — | W28 | — | 0.5 | OEM-A-16 | — | — | — |
| A4 | Aux 2 | — | W29 | — | 0.5 | OEM-A-17 | — | — | — |
| A5 | Aux 3 | — | W30 | — | 0.5 | OEM-A-20 | — | — | — |
| A6 | Aux 4 (fuel pump / relays) | — | W27 | — | 0.5 | OEM-A-15 | — | — | — |
| A7 | Power ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| A8 | Ignition 1 | — | W19 | — | 0.5 | OEM-C-4 | — | — | — |
| A9 | Ignition 2 | — | W20 | — | 0.5 | OEM-C-12 | — | — | — |
OEM-A
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Coolant temp gauge drive | — | — | — | — | — | — | — | — |
| 2 | Air control valve solenoid | — | — | — | — | — | — | — | — |
| 3 | Evap bypass solenoid | — | — | — | — | — | — | — | — |
| 4 | Evap canister vent shut valve | — | — | — | — | — | — | — | — |
| 5 | NC | — | — | — | — | — | — | — | — |
| 6 | Evap canister purge valve | — | — | — | — | — | — | — | — |
| 7 | NC | — | — | — | — | — | — | — | — |
| 8 | NC | — | — | — | — | — | — | — | — |
| 9 | Vehicle speed sensor | — | — | — | — | — | — | — | — |
| 10 | Service check signal | — | — | — | — | — | — | — | — |
| 11 | NC | — | — | — | — | — | — | — | — |
| 12 | Immobilizer indicator light | — | — | — | — | — | — | — | — |
| 13 | Immobilizer enable signal | — | — | — | — | — | — | — | — |
| 14 | NC | — | — | — | — | — | — | — | — |
| 15 | Fuel pump relay (USDM) | — | W27 | — | 0.5 | FT450-A-A6 | — | — | — |
| 16 | Fuel pump relay (JDM) | — | W28 | — | 0.5 | FT450-A-A3 | — | — | — |
| 17 | A/C clutch relay | — | W29 | — | 0.5 | FT450-A-A4 | — | — | — |
| 18 | Check engine light (MIL) | — | — | — | — | — | — | — | — |
| 19 | Tacho output | — | — | — | — | — | — | — | — |
| 20 | Radiator fan relay | — | W30 | — | 0.5 | FT450-A-A5 | — | — | — |
| 21 | K-Line | — | — | — | — | — | — | — | — |
| 22 | NC | — | — | — | — | — | — | — | — |
| 23 | Secondary O2 sensor | — | W33 | — | 0.5 | FT450-A-A22 | — | — | — |
| 24 | Starter switch signal | — | — | — | — | — | — | — | — |
| 25 | Immobilizer code | — | — | — | — | — | — | — | — |
| 26 | Power steering load detect | — | — | — | — | — | — | — | — |
| 27 | A/C switch (request) | — | — | — | — | — | — | — | — |
| 28 | Air pump relay | — | — | — | — | — | — | — | — |
| 29 | Fuel tank pressure sensor | — | — | — | — | — | — | — | — |
| 30 | Electrical load detector | — | — | — | — | — | — | — | — |
| 31 | NC | — | — | — | — | — | — | — | — |
| 32 | Brake switch | — | — | — | — | — | — | — | — |
OEM-B
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Power source 1 (main relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 2 | Power ground 1 | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 3 | Injector 2 | — | W24 | — | 0.5 | FT450-A-A2 | — | — | — |
| 4 | Injector 3 | — | W25 | — | 0.5 | FT450-A-A1 | — | — | — |
| 5 | Injector 4 | — | W26 | — | 0.5 | FT450-A-A2 | — | — | — |
| 6 | NC | — | — | — | — | — | — | — | — |
| 7 | NC | — | — | — | — | — | — | — | — |
| 8 | NC | — | — | — | — | — | — | — | — |
| 9 | Power source 2 (main relay) | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 10 | Power ground 2 | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| 11 | Injector 1 | — | W23 | — | 0.5 | FT450-A-A1 | — | — | — |
| 12 | VTEC solenoid | — | — | — | — | — | — | — | — |
| 13 | NC | — | — | — | — | — | — | — | — |
| 14 | NC | — | — | — | — | — | — | — | — |
| 15 | NC | — | — | — | — | — | — | — | — |
| 16 | NC | — | — | — | — | — | — | — | — |
| 17 | NC | — | — | — | — | — | — | — | — |
| 18 | NC | — | — | — | — | — | — | — | — |
| 19 | NC | — | — | — | — | — | — | — | — |
| 20 | Ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 21 | Backup power (battery constant) | — | — | — | — | — | — | — | — |
| 22 | Ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 23 | Idle air control valve | — | — | — | — | — | — | — | — |
| 24 | NC | — | — | — | — | — | — | — | — |
| 25 | NC | — | — | — | — | — | — | — | — |
OEM-C
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Primary O2 heater | — | — | — | — | — | — | — | — |
| 2 | Alternator control | — | — | — | — | — | — | — | — |
| 3 | Knock sensor | — | — | — | — | — | — | — | — |
| 4 | Ignition coil 1 | — | W19 | — | 0.5 | FT450-A-A8 | — | — | — |
| 5 | Alternator FR signal | — | — | — | — | — | — | — | — |
| 6 | NC | — | — | — | — | — | — | — | — |
| 7 | Sensor ground 1 | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 8 | Crank sensor + (CKP+) | — | — | — | — | — | — | — | — |
| 9 | Crank sensor − (CKP−) | — | — | — | — | — | — | — | — |
| 10 | VTEC pressure switch | — | — | — | — | — | — | — | — |
| 11 | Secondary O2 heater control | — | — | — | — | — | — | — | — |
| 12 | Ignition coil 2 | — | W20 | — | 0.5 | FT450-A-A9 | — | — | — |
| 13 | Ignition coil 3 | — | W21 | — | 0.5 | FT450-A-A10 | — | — | — |
| 14 | Ignition coil 4 | — | W22 | — | 0.5 | FT450-A-A11 | — | — | — |
| 15 | Secondary O2 sensor | — | W34 | — | 0.5 | FT450-A-A23 | — | — | — |
| 16 | Primary O2 sensor | — | W35 | — | 0.5 | FT450-A-A25 | — | — | — |
| 17 | MAP sensor | — | W31 | — | 0.5 | FT450-A-A20 | — | — | — |
| 18 | Sensor ground 2 | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| 19 | Sensor 5V supply 1 (MAP) | — | W14 | — | 0.5 | SP-5V1-1 | — | — | — |
| 20 | Cam (TDC1) sensor + | — | W17 | — | 0.5 | FT450-A-A17 | — | — | — |
| 21 | Cam (TDC1) sensor − | — | W18 | — | 0.5 | SP-0V-1 | — | — | — |
| 22 | Knock sensor | — | — | — | — | — | — | — | — |
| 23 | NC | — | — | — | — | — | — | — | — |
| 24 | Air pump electric current sensor | — | — | — | — | — | — | — | — |
| 25 | Intake air temp sensor | — | W37 | — | 0.5 | FT450-A-A26 | — | — | — |
| 26 | Coolant temp sensor | — | W36 | — | 0.5 | FT450-A-A24 | — | — | — |
| 27 | Throttle position sensor | — | W32 | — | 0.5 | FT450-A-A21 | — | — | — |
| 28 | Sensor 5V supply 2 | — | W15 | — | 0.5 | SP-5V1-1 | — | — | — |
| 29 | Cam (TDC2) sensor + | — | — | — | — | — | — | — | — |
| 30 | Cam (TDC2) sensor − | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| 31 | Timing ground | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
OEM-D
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | NC | — | — | — | — | — | — | — | — |
| 2 | NC | — | — | — | — | — | — | — | — |
| 3 | NC | — | — | — | — | — | — | — | — |
| 4 | NC | — | — | — | — | — | — | — | — |
| 5 | NC | — | — | — | — | — | — | — | — |
| 6 | NC | — | — | — | — | — | — | — | — |
| 7 | NC | — | — | — | — | — | — | — | — |
| 8 | NC | — | — | — | — | — | — | — | — |
| 9 | NC | — | — | — | — | — | — | — | — |
| 10 | NC | — | — | — | — | — | — | — | — |
| 11 | NC | — | — | — | — | — | — | — | — |
| 12 | NC | — | — | — | — | — | — | — | — |
| 13 | NC | — | — | — | — | — | — | — | — |
| 14 | NC | — | — | — | — | — | — | — | — |
| 15 | NC | — | — | — | — | — | — | — | — |
| 16 | NC | — | — | — | — | — | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W13 | — | 0.5 | FT450-A-A12 | — | — | — |
| 1 | — | — | W9 | — | 0.5 | OEM-C-18 | — | — | — |
| 1 | — | — | W10 | — | 0.5 | OEM-C-30 | — | — | — |
| 1 | — | — | W11 | — | 0.5 | OEM-C-31 | — | — | — |
| 1 | — | — | W12 | — | 0.5 | OEM-C-7 | — | — | — |
| 1 | — | — | W18 | — | 0.5 | OEM-C-21 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-B-1 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | OEM-B-9 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | FT450-A-A13 | — | — | — |
SP-5V1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W14 | — | 0.5 | OEM-C-19 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | OEM-C-28 | — | — | — |
| 1 | — | — | W16 | — | 0.5 | FT450-A-A14 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W4 | — | 0.85 | OEM-B-10 | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-B-2 | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-B-20 | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-B-22 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | FT450-A-A7 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-A-1 | Coolant temp gauge drive | low_side_out | — | — | — | corroborated | |
| OEM-A-10 | Service check signal | — | — | — | — | single_source | |
| OEM-A-11 | NC | — | — | — | — | unverified | |
| OEM-A-12 | Immobilizer indicator light | low_side_out | — | — | — | single_source | |
| OEM-A-13 | Immobilizer enable signal | — | — | — | — | single_source | |
| OEM-A-14 | NC | — | — | — | — | unverified | |
| OEM-A-15 | Fuel pump relay (USDM) | low_side_out | FT450-A-A6 | Aux 4 (fuel pump / relays) | low_side_out | corroborated | |
| OEM-A-16 | Fuel pump relay (JDM) | low_side_out | FT450-A-A3 | Aux 1 | low_side_out | single_source | |
| OEM-A-17 | A/C clutch relay | low_side_out | FT450-A-A4 | Aux 2 | low_side_out | corroborated | |
| OEM-A-18 | Check engine light (MIL) | low_side_out | — | — | — | corroborated | |
| OEM-A-19 | Tacho output | tacho_out | — | — | — | corroborated | |
| OEM-A-2 | Air control valve solenoid | low_side_out | — | — | — | single_source | |
| OEM-A-20 | Radiator fan relay | low_side_out | FT450-A-A5 | Aux 3 | low_side_out | corroborated | |
| OEM-A-21 | K-Line | serial | — | — | — | single_source | |
| OEM-A-22 | NC | — | — | — | — | unverified | |
| OEM-A-23 | Secondary O2 sensor | lambda_nb_in | FT450-A-A22 | White input 3 (TPS) | analog_in | single_source | |
| OEM-A-24 | Starter switch signal | digital_in | — | — | — | corroborated | |
| OEM-A-25 | Immobilizer code | — | — | — | — | single_source | |
| OEM-A-26 | Power steering load detect | digital_in | — | — | — | corroborated | |
| OEM-A-27 | A/C switch (request) | digital_in | — | — | — | corroborated | |
| OEM-A-28 | Air pump relay | low_side_out | — | — | — | corroborated | |
| OEM-A-29 | Fuel tank pressure sensor | analog_in | — | — | — | corroborated | |
| OEM-A-3 | Evap bypass solenoid | low_side_out | — | — | — | single_source | |
| OEM-A-30 | Electrical load detector | analog_in | — | — | — | corroborated | |
| OEM-A-31 | NC | — | — | — | — | unverified | |
| OEM-A-32 | Brake switch | digital_in | — | — | — | corroborated | |
| OEM-A-4 | Evap canister vent shut valve | low_side_out | — | — | — | single_source | |
| OEM-A-5 | NC | — | — | — | — | unverified | |
| OEM-A-6 | Evap canister purge valve | low_side_out | — | — | — | single_source | |
| OEM-A-7 | NC | — | — | — | — | unverified | |
| OEM-A-8 | NC | — | — | — | — | unverified | |
| OEM-A-9 | Vehicle speed sensor | digital_in | — | — | — | corroborated | |
| OEM-B-1 | Power source 1 (main relay) | power_in | FT450-A-A13 | +12V switched | power_in | corroborated | |
| OEM-B-10 | Power ground 2 | ground | FT450-A-A7 | Power ground | ground | single_source | |
| OEM-B-11 | Injector 1 | injector_out | FT450-A-A1 | Injector 1 (Bank A) | injector_out | corroborated | |
| OEM-B-12 | VTEC solenoid | high_side_out | — | — | — | corroborated | |
| OEM-B-13 | NC | — | — | — | — | unverified | |
| OEM-B-14 | NC | — | — | — | — | unverified | |
| OEM-B-15 | NC | — | — | — | — | unverified | |
| OEM-B-16 | NC | — | — | — | — | unverified | |
| OEM-B-17 | NC | — | — | — | — | unverified | |
| OEM-B-18 | NC | — | — | — | — | unverified | |
| OEM-B-19 | NC | — | — | — | — | unverified | |
| OEM-B-2 | Power ground 1 | ground | FT450-A-A7 | Power ground | ground | corroborated | |
| OEM-B-20 | Ground | ground | FT450-A-A7 | Power ground | ground | single_source | |
| OEM-B-21 | Backup power (battery constant) | power_in | — | — | — | single_source | |
| OEM-B-22 | Ground | ground | FT450-A-A7 | Power ground | ground | single_source | |
| OEM-B-23 | Idle air control valve | low_side_out | — | — | — | corroborated | |
| OEM-B-24 | NC | — | — | — | — | unverified | |
| OEM-B-25 | NC | — | — | — | — | unverified | |
| OEM-B-3 | Injector 2 | injector_out | FT450-A-A2 | Injector 2 (Bank A) | injector_out | corroborated | |
| OEM-B-4 | Injector 3 | injector_out | FT450-A-A1 | Injector 1 (Bank A) | injector_out | corroborated | |
| OEM-B-5 | Injector 4 | injector_out | FT450-A-A2 | Injector 2 (Bank A) | injector_out | corroborated | |
| OEM-B-6 | NC | — | — | — | — | unverified | |
| OEM-B-7 | NC | — | — | — | — | unverified | |
| OEM-B-8 | NC | — | — | — | — | unverified | |
| OEM-B-9 | Power source 2 (main relay) | power_in | FT450-A-A13 | +12V switched | power_in | corroborated | |
| OEM-C-1 | Primary O2 heater | low_side_out | — | — | — | corroborated | |
| OEM-C-10 | VTEC pressure switch | digital_in | — | — | — | corroborated | |
| OEM-C-11 | Secondary O2 heater control | low_side_out | — | — | — | single_source | |
| OEM-C-12 | Ignition coil 2 | ignition_out | FT450-A-A9 | Ignition 2 | ignition_out | corroborated | |
| OEM-C-13 | Ignition coil 3 | ignition_out | FT450-A-A10 | Ignition 3 | ignition_out | corroborated | |
| OEM-C-14 | Ignition coil 4 | ignition_out | FT450-A-A11 | Ignition 4 | ignition_out | corroborated | |
| OEM-C-15 | Secondary O2 sensor | lambda_nb_in | FT450-A-A23 | White input 4 (oil pressure) | analog_in | corroborated | |
| OEM-C-16 | Primary O2 sensor | lambda_nb_in | FT450-A-A25 | White input 6 (fuel pressure) | analog_in | corroborated | |
| OEM-C-17 | MAP sensor | analog_in | FT450-A-A20 | White input 1 | analog_in | corroborated | |
| OEM-C-18 | Sensor ground 2 | sensor_ground | FT450-A-A12 | Signal ground | sensor_ground | corroborated | |
| OEM-C-19 | Sensor 5V supply 1 (MAP) | vref | FT450-A-A14 | +5V sensor supply | vref | corroborated | |
| OEM-C-2 | Alternator control | low_side_out | — | — | — | single_source | |
| OEM-C-20 | Cam (TDC1) sensor + | trigger_in | FT450-A-A17 | Phase input (cam) | trigger_in | corroborated | |
| OEM-C-21 | Cam (TDC1) sensor − | trigger_in | FT450-A-A12 | Signal ground | sensor_ground | corroborated | |
| OEM-C-22 | Knock sensor | knock_in | — | — | — | conflict | |
| OEM-C-23 | NC | — | — | — | — | unverified | |
| OEM-C-24 | Air pump electric current sensor | analog_in | — | — | — | single_source | |
| OEM-C-25 | Intake air temp sensor | temp_in | FT450-A-A26 | White input 7 (air temp) | temp_in | corroborated | |
| OEM-C-26 | Coolant temp sensor | temp_in | FT450-A-A24 | White input 5 (water temp) | temp_in | corroborated | |
| OEM-C-27 | Throttle position sensor | analog_in | FT450-A-A21 | White input 2 | analog_in | corroborated | |
| OEM-C-28 | Sensor 5V supply 2 | vref | FT450-A-A14 | +5V sensor supply | vref | corroborated | |
| OEM-C-29 | Cam (TDC2) sensor + | trigger_in | — | — | — | corroborated | |
| OEM-C-3 | Knock sensor | knock_in | — | — | — | conflict | |
| OEM-C-30 | Cam (TDC2) sensor − | sensor_ground | FT450-A-A12 | Signal ground | sensor_ground | corroborated | |
| OEM-C-31 | Timing ground | sensor_ground | FT450-A-A12 | Signal ground | sensor_ground | single_source | |
| OEM-C-4 | Ignition coil 1 | ignition_out | FT450-A-A8 | Ignition 1 | ignition_out | corroborated | |
| OEM-C-5 | Alternator FR signal | digital_in | — | — | — | single_source | |
| OEM-C-6 | NC | — | — | — | — | unverified | |
| OEM-C-7 | Sensor ground 1 | sensor_ground | FT450-A-A12 | Signal ground | sensor_ground | corroborated | |
| OEM-C-8 | Crank sensor + (CKP+) | trigger_in | — | — | — | corroborated | |
| OEM-C-9 | Crank sensor − (CKP−) | trigger_in | — | — | — | corroborated | |
| OEM-D-1 | NC | — | — | — | — | unverified | |
| OEM-D-10 | NC | — | — | — | — | unverified | |
| OEM-D-11 | NC | — | — | — | — | unverified | |
| OEM-D-12 | NC | — | — | — | — | unverified | |
| OEM-D-13 | NC | — | — | — | — | unverified | |
| OEM-D-14 | NC | — | — | — | — | unverified | |
| OEM-D-15 | NC | — | — | — | — | unverified | |
| OEM-D-16 | NC | — | — | — | — | unverified | |
| OEM-D-2 | NC | — | — | — | — | unverified | |
| OEM-D-3 | NC | — | — | — | — | unverified | |
| OEM-D-4 | NC | — | — | — | — | unverified | |
| OEM-D-5 | NC | — | — | — | — | unverified | |
| OEM-D-6 | NC | — | — | — | — | unverified | |
| OEM-D-7 | NC | — | — | — | — | unverified | |
| OEM-D-8 | NC | — | — | — | — | unverified | |
| OEM-D-9 | NC | — | — | — | — | unverified |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-B-1 | SP-14V-1 | 0.85 | no route | Power source 1 (main relay) | — | |
| W2 | OEM-B-9 | SP-14V-1 | 0.85 | no route | Power source 2 (main relay) | — | |
| W3 | SP-14V-1 | FT450-A-A13 | 0.85 | no route | +12V switched | — | |
| W4 | OEM-B-10 | SP-GND-1 | 0.85 | no route | Power ground 2 | — | |
| W5 | OEM-B-2 | SP-GND-1 | 0.85 | no route | Power ground 1 | — | |
| W6 | OEM-B-20 | SP-GND-1 | 0.85 | no route | Ground | — | |
| W7 | OEM-B-22 | SP-GND-1 | 0.85 | no route | Ground | — | |
| W8 | SP-GND-1 | FT450-A-A7 | 0.85 | no route | Power ground | — | |
| W9 | OEM-C-18 | SP-0V-1 | 0.5 | no route | Sensor ground 2 | — | |
| W10 | OEM-C-30 | SP-0V-1 | 0.5 | no route | Cam (TDC2) sensor − | — | |
| W11 | OEM-C-31 | SP-0V-1 | 0.5 | no route | Timing ground | — | |
| W12 | OEM-C-7 | SP-0V-1 | 0.5 | no route | Sensor ground 1 | — | |
| W13 | SP-0V-1 | FT450-A-A12 | 0.5 | no route | Signal ground | — | |
| W14 | OEM-C-19 | SP-5V1-1 | 0.5 | no route | Sensor 5V supply 1 (MAP) | — | |
| W15 | OEM-C-28 | SP-5V1-1 | 0.5 | no route | Sensor 5V supply 2 | — | |
| W16 | SP-5V1-1 | FT450-A-A14 | 0.5 | no route | +5V sensor supply | — | |
| W17 | OEM-C-20 | FT450-A-A17 | 0.5 | no route | Cam (TDC1) sensor + | — | |
| W18 | OEM-C-21 | SP-0V-1 | 0.5 | no route | Cam (TDC1) sensor − | — | |
| W19 | OEM-C-4 | FT450-A-A8 | 0.5 | no route | Ignition coil 1 | — | |
| W20 | OEM-C-12 | FT450-A-A9 | 0.5 | no route | Ignition coil 2 | — | |
| W21 | OEM-C-13 | FT450-A-A10 | 0.5 | no route | Ignition coil 3 | — | |
| W22 | OEM-C-14 | FT450-A-A11 | 0.5 | no route | Ignition coil 4 | — | |
| W23 | OEM-B-11 | FT450-A-A1 | 0.5 | no route | Injector 1 | — | |
| W24 | OEM-B-3 | FT450-A-A2 | 0.5 | no route | Injector 2 | — | |
| W25 | OEM-B-4 | FT450-A-A1 | 0.5 | no route | Injector 3 | — | |
| W26 | OEM-B-5 | FT450-A-A2 | 0.5 | no route | Injector 4 | — | |
| W27 | OEM-A-15 | FT450-A-A6 | 0.5 | no route | Fuel pump relay (USDM) | — | |
| W28 | OEM-A-16 | FT450-A-A3 | 0.5 | no route | Fuel pump relay (JDM) | — | |
| W29 | OEM-A-17 | FT450-A-A4 | 0.5 | no route | A/C clutch relay | — | |
| W30 | OEM-A-20 | FT450-A-A5 | 0.5 | no route | Radiator fan relay | — | |
| W31 | OEM-C-17 | FT450-A-A20 | 0.5 | no route | MAP sensor | — | |
| W32 | OEM-C-27 | FT450-A-A21 | 0.5 | no route | Throttle position sensor | — | |
| W33 | OEM-A-23 | FT450-A-A22 | 0.5 | no route | Secondary O2 sensor | — | |
| W34 | OEM-C-15 | FT450-A-A23 | 0.5 | no route | Secondary O2 sensor | — | |
| W35 | OEM-C-16 | FT450-A-A25 | 0.5 | no route | Primary O2 sensor | — | |
| W36 | OEM-C-26 | FT450-A-A24 | 0.5 | no route | Coolant temp sensor | — | |
| W37 | OEM-C-25 | FT450-A-A26 | 0.5 | no route | Intake air temp sensor | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|---|---|---|---|---|
| connector | 179679-6 | TE | S2000 2000–05 ECU harness plug B (25P, TE 040 Multi-Lock) | 1.000 | ea |
| connector | 179680-5 | TE | S2000 2000–05 ECU harness plug C (31P, TE 040 Multi-Lock) | 1.000 | ea |
| connector | 179681-6 | TE | S2000 2000–05 ECU harness plug A (32P, TE 040 Multi-Lock) | 1.000 | ea |
| connector | S2K-0005-ECU-D | Honda | S2000 2000–05 ECU plug D (P/N unknown) | 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 (14)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | NET_MERGED | FT450-A-A1 + OEM-B-11 + OEM-B-4 | 2 different OEM functions share one net: OEM-B-11 Injector 1; OEM-B-4 Injector 3 |
| error | NET_MERGED | FT450-A-A2 + OEM-B-3 + OEM-B-5 | 2 different OEM functions share one net: OEM-B-3 Injector 2; OEM-B-5 Injector 4 |
| error | REQUIRED_UNMAPPED | OEM-B-12 | Required OEM function "VTEC solenoid" (high_side_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-C-8 | Required OEM function "Crank sensor + (CKP+)" (trigger_in) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-C-9 | Required OEM function "Crank sensor − (CKP−)" (trigger_in) is not connected to the new ECU. |
| warn | LOAD_UNKNOWN | FT450-A-A1 | FT450-A-A1 "Injector 1 (Bank A)" drives OEM-B-11 Injector 1, OEM-B-4 Injector 3 (load 2.4 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | FT450-A-A2 | FT450-A-A2 "Injector 2 (Bank A)" drives OEM-B-3 Injector 2, OEM-B-5 Injector 4 (load 2.4 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | FT450-A-A3 | FT450-A-A3 "Aux 1" drives OEM-A-16 Fuel pump relay (JDM) (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | FT450-A-A4 | FT450-A-A4 "Aux 2" drives OEM-A-17 A/C clutch relay (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | FT450-A-A5 | FT450-A-A5 "Aux 3" drives OEM-A-20 Radiator fan relay (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | FT450-A-A6 | FT450-A-A6 "Aux 4 (fuel pump / relays)" drives OEM-A-15 Fuel pump relay (USDM) (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | SUPPLY_GROUP | FT450-A-A14 + OEM-C-19 + OEM-C-28 + SP-5V1-1 | Supplies meant to stay independent share one net: OEM-C-19 [s2k_vcc1], OEM-C-28 [s2k_vcc2]. The new ECU has no free 5 V reference, so they share one: normal on a standalone, but a short on any of these sensors drops them all. |
| info | NET_FAMILY | OEM-C-18 ↔ OEM-C-21 | OEM-C-18 "Sensor ground 2" [sensor_ground] is wired to OEM-C-21 "Cam (TDC1) sensor −" [trigger_in]. Trigger return tied to sensor/trigger ground: correct for single-ended trigger inputs. |
| info | UNMAPPED | OEM | 31 optional OEM pins are not mapped: OEM-A-1 Coolant temp gauge drive; OEM-A-10 Service check signal; OEM-A-12 Immobilizer indicator light; OEM-A-13 Immobilizer enable signal; OEM-A-18 Check engine light (MIL); OEM-A-19 Tacho output; OEM-A-2 Air control valve solenoid; OEM-A-21 K-Line; OEM-A-24 Starter switch signal; OEM-A-25 Immobilizer code; OEM-A-26 Power steering load detect; OEM-A-27 A/C switch (request); OEM-A-28 Air pump relay; OEM-A-29 Fuel tank pressure sensor; OEM-A-3 Evap bypass solenoid; OEM-A-30 Electrical load detector; OEM-A-32 Brake switch; OEM-A-4 Evap canister vent shut valve; OEM-A-6 Evap canister purge valve; OEM-A-9 Vehicle speed sensor; OEM-B-21 Backup power (battery constant); OEM-B-23 Idle air control valve; OEM-C-1 Primary O2 heater; OEM-C-10 VTEC pressure switch; OEM-C-11 Secondary O2 heater control; OEM-C-2 Alternator control; OEM-C-22 Knock sensor; OEM-C-24 Air pump electric current sensor; OEM-C-29 Cam (TDC2) sensor +; OEM-C-3 Knock sensor; OEM-C-5 Alternator FR signal |
Accepted (0)
| Code | Subject | Reason | By |
|---|
Notes
Fit check: unconfirmed. Confirm these before building: - Trigger pattern for Honda F20C not found in the ECU's docs (No S2000 (F20C) trigger pattern in the list.) - No knock input; the stock knock sensor would be unused - Only 2 injector outputs for 4 injectors: batch / semi-sequential injection 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-C 8: Crank sensor + (CKP+): 2 stock pins named "Crank sensor" without a documented polarity / pairing; wire by hand - OEM-C 9: Crank sensor − (CKP−): 2 stock pins named "Crank sensor" without a documented polarity / pairing; wire by hand - OEM-B 12: VTEC solenoid: no free high_side/ls_hs/hbridge rated ≥ 1.0 A on FuelTech FT450 Not wired: - OEM-B 21: Backup power (battery constant): FuelTech FT450 has no battery-constant input; not needed - OEM-C 29: Cam (TDC2) sensor +: no free cam_vr/cam_hall/frequency_in input on FuelTech FT450 - OEM-C 22: Knock sensor: no free knock input on FuelTech FT450 - OEM-C 3: Knock sensor: no free knock input on FuelTech FT450 - OEM-A 28: Air pump relay: no free relay_control/low_side/ls_hs/injector/hbridge rated ≥ 0.2 A on FuelTech FT450 - OEM-C 1: Primary O2 heater: no free heater_low_side/low_side/ls_hs/hbridge on FuelTech FT450 - OEM-C 11: Secondary O2 heater control: no free heater_low_side/low_side/ls_hs/hbridge on FuelTech FT450 - OEM-B 23: Idle air control valve: no free low_side/ls_hs/injector/hbridge rated ≥ 1.0 A on FuelTech FT450 - OEM-A 1: Coolant temp gauge drive: no free low_side/ls_hs/injector/hbridge on FuelTech FT450 - OEM-A 12: Immobilizer indicator light: no free low_side/ls_hs/injector/hbridge on FuelTech FT450 - OEM-A 18: Check engine light (MIL): no free low_side/ls_hs/injector/hbridge on FuelTech FT450 - OEM-A 2: Air control valve solenoid: no free low_side/ls_hs/injector/hbridge on FuelTech FT450 - OEM-A 3: Evap bypass solenoid: no free low_side/ls_hs/injector/hbridge on FuelTech FT450 - OEM-A 4: Evap canister vent shut valve: no free low_side/ls_hs/injector/hbridge on FuelTech FT450 - OEM-A 6: Evap canister purge valve: no free low_side/ls_hs/injector/hbridge on FuelTech FT450 - OEM-C 2: Alternator control: no free low_side/ls_hs/injector/hbridge on FuelTech FT450 - OEM-A 19: Tacho output: no free tacho/frequency_out/low_side/ls_hs on FuelTech FT450 - OEM-A 29: Fuel tank pressure sensor: no free analog_0_5 on FuelTech FT450 - OEM-A 30: Electrical load detector: no free analog_0_5 on FuelTech FT450 - OEM-C 24: Air pump electric current sensor: no free analog_0_5 on FuelTech FT450 - OEM-A 9: Vehicle speed sensor: no free frequency_in/switch_in on FuelTech FT450 - OEM-C 5: Alternator FR signal: no free frequency_in/switch_in on FuelTech FT450 - OEM-A 24: Starter switch signal: no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-A 26: Power steering load detect: no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-A 27: A/C switch (request): no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-A 32: Brake switch: no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-C 10: VTEC pressure switch: no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-A 21: K-Line: no free k_line on FuelTech FT450 - OEM-A 10: Service check signal: not classified in the library; wire by hand - OEM-A 13: Immobilizer enable signal: not classified in the library; wire by hand - OEM-A 25: Immobilizer code: not classified in the library; wire by hand
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | AEM 30-6052 Series 2 Plug & Play EMS, 2000–2005 S2000 (original ECU pinout) | https://documents.aemelectronics.com/techlibrary_30-6052_series_2_plug___play_ems.pdf | — | 2026-10-05 | 9f79620fff5a |
| 4 | vendor_doc | FuelTech FT450/FT550 ready harness manual (4 & 6 cylinder) — FT450 Connector A pinout | http://ftmanager.fueltech.com.br/downloads/manual/Portugues/Chicote_pronto_FT450-FT550.pdf | — | — | — |
| 4 | vendor_doc | Haltech KB: F20C (AP1) engine | https://support.haltech.com/portal/en/kb/articles/f20c-ap1-engine | — | 2026-10-05 | e804da29d014 |
| 4 | vendor_doc | Link S2000 AP1 PlugIn installation manual | https://linkecu.com/documentation/S2000X.pdf | — | 2026-10-05 | d12b0ff3f006 |
| 2 | forum | AllPinouts: 2000–2005 Honda S2000 ECU | https://allpinouts.org/pinouts/connectors/car/2000-2005-honda-s2000-ecu/ | archive | 2026-10-05 | 81d874e0385d |
| 2 | forum | Autodata blog: ECU Pinout Honda S2000 2000-2004 | http://autodatas.blogspot.com/2012/11/ecu-pinout-honda-s2000-2000-2004.html | — | 2026-10-05 | 33b93af7640e |
| 2 | derived | Typical load estimates (relay coil ~0.2 A, high-Z injector ~1.2 A, VVT solenoid ~1 A) | — | — | — | — |