RSX Type-S 2002-04 (K20A2) → FuelTech FT450 (auto)
RSX Type-S 2002-04 (K20A2) — 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 | 3: read the Findings page before cutting any wire |
| Size of the job | 39 wires · 8 connectors · 4 part lines |
| Tools | 715131-1 · wire strippers · multimeter · heat gun + heat-shrink |
| Terminals | 316836-1 |
| 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-A-2 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | OEM-A-3 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-14V-1 | FT450-A-A13 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-A-23 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-A-24 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-A-4 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-A-5 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | OEM-E-3 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | FT450-A-A7 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-A-10 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-A-11 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-E-4 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | SP-0V-1 | FT450-A-A12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-A-20 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-A-21 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-E-5 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | SP-5V1-1 | FT450-A-A14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-A-7 | FT450-A-A18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | SP-0V-1 | FT450-A-A18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-A-25 | FT450-A-A17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-A-30 | FT450-A-A8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-A-29 | FT450-A-A9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-A-28 | FT450-A-A10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-A-27 | FT450-A-A11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-B-5 | FT450-A-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-B-4 | FT450-A-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-B-3 | FT450-A-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-B-2 | FT450-A-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-E-7 | FT450-A-A6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-A-19 | FT450-A-A23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-A-15 | FT450-A-A20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-B-8 | FT450-A-A24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-B-6 | FT450-A-A3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-E-1 | FT450-A-A4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-E-18 | FT450-A-A5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-E-2 | FT450-A-A21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-B-17 | FT450-A-A26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-B-13 | FT450-A-A22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-E-14 | FT450-A-A25 | 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) | — | W25 | — | 0.5 | OEM-B-5 | — | — | — |
| A1 | Injector 1 (Bank A) | — | W27 | — | 0.5 | OEM-B-3 | — | — | — |
| A10 | Ignition 3 | — | W23 | — | 0.5 | OEM-A-28 | — | — | — |
| A11 | Ignition 4 | — | W24 | — | 0.5 | OEM-A-27 | — | — | — |
| A12 | Signal ground | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| A13 | +12V switched | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| A14 | +5V sensor supply | — | W17 | — | 0.5 | SP-5V1-1 | — | — | — |
| A15 | CAN A LOW | — | — | — | — | — | — | — | — |
| A16 | CAN A HIGH | — | — | — | — | — | — | — | — |
| A17 | Phase input (cam) | — | W20 | — | 0.5 | OEM-A-25 | — | — | — |
| A18 | RPM reference (crank -) | — | W18 | — | 0.5 | OEM-A-7 | — | — | — |
| A18 | RPM reference (crank -) | — | W19 | — | 0.5 | SP-0V-1 | — | — | — |
| A19 | RPM signal (crank +) | — | — | — | — | — | — | — | — |
| A2 | Injector 2 (Bank A) | — | W26 | — | 0.5 | OEM-B-4 | — | — | — |
| A2 | Injector 2 (Bank A) | — | W28 | — | 0.5 | OEM-B-2 | — | — | — |
| A20 | White input 1 | — | W31 | — | 0.5 | OEM-A-15 | — | — | — |
| A21 | White input 2 | — | W36 | — | 0.5 | OEM-E-2 | — | — | — |
| A22 | White input 3 (TPS) | — | W38 | — | 0.5 | OEM-B-13 | — | — | — |
| A23 | White input 4 (oil pressure) | — | W30 | — | 0.5 | OEM-A-19 | — | — | — |
| A24 | White input 5 (water temp) | — | W32 | — | 0.5 | OEM-B-8 | — | — | — |
| A25 | White input 6 (fuel pressure) | — | W39 | — | 0.5 | OEM-E-14 | — | — | — |
| A26 | White input 7 (air temp) | — | W37 | — | 0.5 | OEM-B-17 | — | — | — |
| A3 | Aux 1 | — | W33 | — | 0.5 | OEM-B-6 | — | — | — |
| A4 | Aux 2 | — | W34 | — | 0.5 | OEM-E-1 | — | — | — |
| A5 | Aux 3 | — | W35 | — | 0.5 | OEM-E-18 | — | — | — |
| A6 | Aux 4 (fuel pump / relays) | — | W29 | — | 0.5 | OEM-E-7 | — | — | — |
| A7 | Power ground | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| A8 | Ignition 1 | — | W21 | — | 0.5 | OEM-A-30 | — | — | — |
| A9 | Ignition 2 | — | W22 | — | 0.5 | OEM-A-29 | — | — | — |
OEM-A
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | A/F sensor heater control (AFSHTC) | — | — | — | — | — | — | — | — |
| 2 | Ignition power 2 (IGP2) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 3 | Ignition power 1 (IGP1) | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 4 | Power ground 2 (PG2) | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 5 | Power ground 1 (PG1) | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 6 | A/F sensor + (AFS+, wideband Ip) | — | — | — | — | — | — | — | — |
| 7 | Crank position sensor (CKP) | — | W18 | — | 0.5 | FT450-A-A18 | — | — | — |
| 8 | — | — | — | — | — | — | — | — | — |
| 9 | Knock sensor (KS) | — | — | — | — | — | — | — | — |
| 10 | Sensor ground 2 (SG2) | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| 11 | Sensor ground 1 (SG1) | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| 12 | Idle air control valve (IACV) | — | — | — | — | — | — | — | — |
| 13 | — | — | — | — | — | — | — | — | — |
| 14 | — | — | — | — | — | — | — | — | — |
| 15 | Throttle position sensor (TPS) | — | W31 | — | 0.5 | FT450-A-A20 | — | — | — |
| 16 | A/F sensor - (AFS-, wideband Vs) | — | — | — | — | — | — | — | — |
| 17 | — | — | — | — | — | — | — | — | — |
| 18 | Vehicle speed sensor (VSS, M/T) | — | — | — | — | — | — | — | — |
| 19 | Manifold absolute pressure (MAP) | — | W30 | — | 0.5 | FT450-A-A23 | — | — | — |
| 20 | Sensor 5V supply 2 (VCC2) | — | W14 | — | 0.5 | SP-5V1-1 | — | — | — |
| 21 | Sensor 5V supply 1 (VCC1) | — | W15 | — | 0.5 | SP-5V1-1 | — | — | — |
| 22 | A/F sensor heater supply (AFSHTC+) | — | — | — | — | — | — | — | — |
| 23 | Logic ground 2 (LG2) | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| 24 | Logic ground 1 (LG1) | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 25 | Camshaft position A (CMP A) | — | W20 | — | 0.5 | FT450-A-A17 | — | — | — |
| 26 | Camshaft position B (CMP B) | — | — | — | — | — | — | — | — |
| 27 | Ignition coil 4 (IGPLS4) | — | W24 | — | 0.5 | FT450-A-A11 | — | — | — |
| 28 | Ignition coil 3 (IGPLS3) | — | W23 | — | 0.5 | FT450-A-A10 | — | — | — |
| 29 | Ignition coil 2 (IGPLS2) | — | W22 | — | 0.5 | FT450-A-A9 | — | — | — |
| 30 | Ignition coil 1 (IGPLS1) | — | W21 | — | 0.5 | FT450-A-A8 | — | — | — |
| 31 | — | — | — | — | — | — | — | — | — |
OEM-B
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | VTC oil control solenoid (+) | — | — | — | — | — | — | — | — |
| 2 | Injector 4 (INJ4) | — | W28 | — | 0.5 | FT450-A-A2 | — | — | — |
| 3 | Injector 3 (INJ3) | — | W27 | — | 0.5 | FT450-A-A1 | — | — | — |
| 4 | Injector 2 (INJ2) | — | W26 | — | 0.5 | FT450-A-A2 | — | — | — |
| 5 | Injector 1 (INJ1) | — | W25 | — | 0.5 | FT450-A-A1 | — | — | — |
| 6 | Radiator fan control (FANC) | — | W33 | — | 0.5 | FT450-A-A3 | — | — | — |
| 7 | Reverse lockout solenoid (RVS, Type-S) | — | — | — | — | — | — | — | — |
| 8 | Coolant temp sensor (ECT) | — | W32 | — | 0.5 | FT450-A-A24 | — | — | — |
| 9 | VTEC oil pressure switch (VTPSW) | — | — | — | — | — | — | — | — |
| 10 | Alternator L signal (ALTL) | — | — | — | — | — | — | — | — |
| 11 | — | — | — | — | — | — | — | — | — |
| 12 | — | — | — | — | — | — | — | — | — |
| 13 | Alternator FR signal (ALTF) | — | W38 | — | 0.5 | FT450-A-A22 | — | — | — |
| 14 | — | — | — | — | — | — | — | — | — |
| 15 | VTEC solenoid (VTS) | — | — | — | — | — | — | — | — |
| 16 | — | — | — | — | — | — | — | — | — |
| 17 | Intake air temp sensor (IAT) | — | W37 | — | 0.5 | FT450-A-A26 | — | — | — |
| 18 | Alternator control (ALTC) | — | — | — | — | — | — | — | — |
| 19 | — | — | — | — | — | — | — | — | — |
| 20 | — | — | — | — | — | — | — | — | — |
| 21 | Evap canister purge valve (PCS) | — | — | — | — | — | — | — | — |
| 22 | — | — | — | — | — | — | — | — | — |
| 23 | VTC oil control solenoid (-) | — | — | — | — | — | — | — | — |
| 24 | — | — | — | — | — | — | — | — | — |
OEM-E
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Immobilizer fuel pump relay (IMO FPR) | — | W34 | — | 0.5 | FT450-A-A4 | — | — | — |
| 2 | Secondary heated O2 sensor (SHO2S) | — | W36 | — | 0.5 | FT450-A-A21 | — | — | — |
| 3 | Logic ground 3 (LG3) | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 4 | Sensor ground 3 (SG3) | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 5 | Sensor 5V supply 3 (VCC3) | — | W16 | — | 0.5 | SP-5V1-1 | — | — | — |
| 6 | Secondary O2 heater control (SO2SHTC) | — | — | — | — | — | — | — | — |
| 7 | Main relay control (MRLY) | — | W29 | — | 0.5 | FT450-A-A6 | — | — | — |
| 8 | A/F sensor heater relay control (AFSHTCR) | — | — | — | — | — | — | — | — |
| 9 | Ignition switch signal (IG1) | — | — | — | — | — | — | — | — |
| 10 | — | — | — | — | — | — | — | — | — |
| 11 | — | — | — | — | — | — | — | — | — |
| 12 | — | — | — | — | — | — | — | — | — |
| 13 | — | — | — | — | — | — | — | — | — |
| 14 | Fuel tank pressure sensor (FTP) | — | W39 | — | 0.5 | FT450-A-A25 | — | — | — |
| 15 | Electrical load detector (ELD) | — | — | — | — | — | — | — | — |
| 16 | Power steering pressure switch (PSPSW) | — | — | — | — | — | — | — | — |
| 17 | — | — | — | — | — | — | — | — | — |
| 18 | A/C clutch relay (ACC) | — | W35 | — | 0.5 | FT450-A-A5 | — | — | — |
| 19 | — | — | — | — | — | — | — | — | — |
| 20 | Brake switch / interlock (2WBS) | — | — | — | — | — | — | — | — |
| 21 | Evap vent shut valve (VSV) | — | — | — | — | — | — | — | — |
| 22 | Brake switch (BKSW) | — | — | — | — | — | — | — | — |
| 23 | K-line (diagnostic) | — | — | — | — | — | — | — | — |
| 24 | Multiplex communication (SEFMJ) | — | — | — | — | — | — | — | — |
| 25 | — | — | — | — | — | — | — | — | — |
| 26 | Engine speed pulse / tacho (NEP) | — | — | — | — | — | — | — | — |
| 27 | Immobilizer code (IMOCD) | — | — | — | — | — | — | — | — |
| 28 | — | — | — | — | — | — | — | — | — |
| 29 | Service check signal (SCS) | — | — | — | — | — | — | — | — |
| 30 | Write enable signal (WEN) | — | — | — | — | — | — | — | — |
| 31 | Malfunction indicator lamp (MIL) | — | — | — | — | — | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W10 | — | 0.5 | OEM-A-10 | — | — | — |
| 1 | — | — | W11 | — | 0.5 | OEM-A-11 | — | — | — |
| 1 | — | — | W12 | — | 0.5 | OEM-E-4 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | FT450-A-A12 | — | — | — |
| 1 | — | — | W19 | — | 0.5 | FT450-A-A18 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-A-2 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | OEM-A-3 | — | — | — |
| 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-A-20 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | OEM-A-21 | — | — | — |
| 1 | — | — | W16 | — | 0.5 | OEM-E-5 | — | — | — |
| 1 | — | — | W17 | — | 0.5 | FT450-A-A14 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W4 | — | 0.85 | OEM-A-23 | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-A-24 | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-A-4 | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-A-5 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | OEM-E-3 | — | — | — |
| 1 | — | — | W9 | — | 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 | A/F sensor heater control (AFSHTC) | low_side_out | — | — | — | single_source | |
| OEM-A-10 | Sensor ground 2 (SG2) | sensor_ground | FT450-A-A12 + FT450-A-A18 | Signal ground + RPM reference (crank -) | sensor_ground + trigger_in | corroborated | |
| OEM-A-11 | Sensor ground 1 (SG1) | sensor_ground | FT450-A-A12 + FT450-A-A18 | Signal ground + RPM reference (crank -) | sensor_ground + trigger_in | corroborated | |
| OEM-A-12 | Idle air control valve (IACV) | low_side_out | — | — | — | corroborated | |
| OEM-A-15 | Throttle position sensor (TPS) | analog_in | FT450-A-A20 | White input 1 | analog_in | corroborated | |
| OEM-A-16 | A/F sensor - (AFS-, wideband Vs) | wb_vs | — | — | — | single_source | |
| OEM-A-18 | Vehicle speed sensor (VSS, M/T) | digital_in | — | — | — | corroborated | |
| OEM-A-19 | Manifold absolute pressure (MAP) | analog_in | FT450-A-A23 | White input 4 (oil pressure) | analog_in | corroborated | |
| OEM-A-2 | Ignition power 2 (IGP2) | power_in | FT450-A-A13 | +12V switched | power_in | corroborated | |
| OEM-A-20 | Sensor 5V supply 2 (VCC2) | vref | FT450-A-A14 | +5V sensor supply | vref | corroborated | |
| OEM-A-21 | Sensor 5V supply 1 (VCC1) | vref | FT450-A-A14 | +5V sensor supply | vref | corroborated | |
| OEM-A-22 | A/F sensor heater supply (AFSHTC+) | power_out | — | — | — | single_source | |
| OEM-A-23 | Logic ground 2 (LG2) | ground | FT450-A-A7 | Power ground | ground | corroborated | |
| OEM-A-24 | Logic ground 1 (LG1) | ground | FT450-A-A7 | Power ground | ground | corroborated | |
| OEM-A-25 | Camshaft position A (CMP A) | trigger_in | FT450-A-A17 | Phase input (cam) | trigger_in | single_source | |
| OEM-A-26 | Camshaft position B (CMP B) | trigger_in | — | — | — | single_source | |
| OEM-A-27 | Ignition coil 4 (IGPLS4) | ignition_out | FT450-A-A11 | Ignition 4 | ignition_out | corroborated | |
| OEM-A-28 | Ignition coil 3 (IGPLS3) | ignition_out | FT450-A-A10 | Ignition 3 | ignition_out | corroborated | |
| OEM-A-29 | Ignition coil 2 (IGPLS2) | ignition_out | FT450-A-A9 | Ignition 2 | ignition_out | corroborated | |
| OEM-A-3 | Ignition power 1 (IGP1) | power_in | FT450-A-A13 | +12V switched | power_in | corroborated | |
| OEM-A-30 | Ignition coil 1 (IGPLS1) | ignition_out | FT450-A-A8 | Ignition 1 | ignition_out | corroborated | |
| OEM-A-4 | Power ground 2 (PG2) | ground | FT450-A-A7 | Power ground | ground | corroborated | |
| OEM-A-5 | Power ground 1 (PG1) | ground | FT450-A-A7 | Power ground | ground | corroborated | |
| OEM-A-6 | A/F sensor + (AFS+, wideband Ip) | wb_ip | — | — | — | single_source | |
| OEM-A-7 | Crank position sensor (CKP) | trigger_in | FT450-A-A12 + FT450-A-A18 | Signal ground + RPM reference (crank -) | sensor_ground + trigger_in | corroborated | |
| OEM-A-9 | Knock sensor (KS) | knock_in | — | — | — | corroborated | |
| OEM-B-1 | VTC oil control solenoid (+) | low_side_out | — | — | — | corroborated | |
| OEM-B-10 | Alternator L signal (ALTL) | digital_in | — | — | — | single_source | |
| OEM-B-13 | Alternator FR signal (ALTF) | analog_in | FT450-A-A22 | White input 3 (TPS) | analog_in | single_source | |
| OEM-B-15 | VTEC solenoid (VTS) | low_side_out | — | — | — | single_source | |
| OEM-B-17 | Intake air temp sensor (IAT) | temp_in | FT450-A-A26 | White input 7 (air temp) | temp_in | corroborated | |
| OEM-B-18 | Alternator control (ALTC) | low_side_out | — | — | — | corroborated | |
| OEM-B-2 | Injector 4 (INJ4) | injector_out | FT450-A-A2 | Injector 2 (Bank A) | injector_out | corroborated | |
| OEM-B-21 | Evap canister purge valve (PCS) | low_side_out | — | — | — | corroborated | |
| OEM-B-23 | VTC oil control solenoid (-) | low_side_out | — | — | — | corroborated | |
| OEM-B-3 | Injector 3 (INJ3) | injector_out | FT450-A-A1 | Injector 1 (Bank A) | injector_out | corroborated | |
| OEM-B-4 | Injector 2 (INJ2) | injector_out | FT450-A-A2 | Injector 2 (Bank A) | injector_out | corroborated | |
| OEM-B-5 | Injector 1 (INJ1) | injector_out | FT450-A-A1 | Injector 1 (Bank A) | injector_out | corroborated | |
| OEM-B-6 | Radiator fan control (FANC) | low_side_out | FT450-A-A3 | Aux 1 | low_side_out | corroborated | |
| OEM-B-7 | Reverse lockout solenoid (RVS, Type-S) | low_side_out | — | — | — | corroborated | |
| OEM-B-8 | Coolant temp sensor (ECT) | temp_in | FT450-A-A24 | White input 5 (water temp) | temp_in | corroborated | |
| OEM-B-9 | VTEC oil pressure switch (VTPSW) | digital_in | — | — | — | corroborated | |
| OEM-E-1 | Immobilizer fuel pump relay (IMO FPR) | low_side_out | FT450-A-A4 | Aux 2 | low_side_out | corroborated | |
| OEM-E-14 | Fuel tank pressure sensor (FTP) | analog_in | FT450-A-A25 | White input 6 (fuel pressure) | analog_in | corroborated | |
| OEM-E-15 | Electrical load detector (ELD) | analog_in | — | — | — | corroborated | |
| OEM-E-16 | Power steering pressure switch (PSPSW) | digital_in | — | — | — | corroborated | |
| OEM-E-18 | A/C clutch relay (ACC) | low_side_out | FT450-A-A5 | Aux 3 | low_side_out | corroborated | |
| OEM-E-2 | Secondary heated O2 sensor (SHO2S) | lambda_nb_in | FT450-A-A21 | White input 2 | analog_in | corroborated | |
| OEM-E-20 | Brake switch / interlock (2WBS) | digital_in | — | — | — | single_source | |
| OEM-E-21 | Evap vent shut valve (VSV) | low_side_out | — | — | — | corroborated | |
| OEM-E-22 | Brake switch (BKSW) | digital_in | — | — | — | corroborated | |
| OEM-E-23 | K-line (diagnostic) | serial | — | — | — | single_source | |
| OEM-E-24 | Multiplex communication (SEFMJ) | serial | — | — | — | corroborated | |
| OEM-E-26 | Engine speed pulse / tacho (NEP) | tacho_out | — | — | — | corroborated | |
| OEM-E-27 | Immobilizer code (IMOCD) | — | — | — | — | single_source | |
| OEM-E-29 | Service check signal (SCS) | — | — | — | — | single_source | |
| OEM-E-3 | Logic ground 3 (LG3) | ground | FT450-A-A7 | Power ground | ground | corroborated | |
| OEM-E-30 | Write enable signal (WEN) | — | — | — | — | single_source | |
| OEM-E-31 | Malfunction indicator lamp (MIL) | low_side_out | — | — | — | corroborated | |
| OEM-E-4 | Sensor ground 3 (SG3) | sensor_ground | FT450-A-A12 + FT450-A-A18 | Signal ground + RPM reference (crank -) | sensor_ground + trigger_in | corroborated | |
| OEM-E-5 | Sensor 5V supply 3 (VCC3) | vref | FT450-A-A14 | +5V sensor supply | vref | corroborated | |
| OEM-E-6 | Secondary O2 heater control (SO2SHTC) | low_side_out | — | — | — | corroborated | |
| OEM-E-7 | Main relay control (MRLY) | low_side_out | FT450-A-A6 | Aux 4 (fuel pump / relays) | low_side_out | corroborated | |
| OEM-E-8 | A/F sensor heater relay control (AFSHTCR) | low_side_out | — | — | — | corroborated | |
| OEM-E-9 | Ignition switch signal (IG1) | digital_in | — | — | — | corroborated |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-A-2 | SP-14V-1 | 0.85 | no route | Ignition power 2 (IGP2) | — | |
| W2 | OEM-A-3 | SP-14V-1 | 0.85 | no route | Ignition power 1 (IGP1) | — | |
| W3 | SP-14V-1 | FT450-A-A13 | 0.85 | no route | +12V switched | — | |
| W4 | OEM-A-23 | SP-GND-1 | 0.85 | no route | Logic ground 2 (LG2) | — | |
| W5 | OEM-A-24 | SP-GND-1 | 0.85 | no route | Logic ground 1 (LG1) | — | |
| W6 | OEM-A-4 | SP-GND-1 | 0.85 | no route | Power ground 2 (PG2) | — | |
| W7 | OEM-A-5 | SP-GND-1 | 0.85 | no route | Power ground 1 (PG1) | — | |
| W8 | OEM-E-3 | SP-GND-1 | 0.85 | no route | Logic ground 3 (LG3) | — | |
| W9 | SP-GND-1 | FT450-A-A7 | 0.85 | no route | Power ground | — | |
| W10 | OEM-A-10 | SP-0V-1 | 0.5 | no route | Sensor ground 2 (SG2) | — | |
| W11 | OEM-A-11 | SP-0V-1 | 0.5 | no route | Sensor ground 1 (SG1) | — | |
| W12 | OEM-E-4 | SP-0V-1 | 0.5 | no route | Sensor ground 3 (SG3) | — | |
| W13 | SP-0V-1 | FT450-A-A12 | 0.5 | no route | Signal ground | — | |
| W14 | OEM-A-20 | SP-5V1-1 | 0.5 | no route | Sensor 5V supply 2 (VCC2) | — | |
| W15 | OEM-A-21 | SP-5V1-1 | 0.5 | no route | Sensor 5V supply 1 (VCC1) | — | |
| W16 | OEM-E-5 | SP-5V1-1 | 0.5 | no route | Sensor 5V supply 3 (VCC3) | — | |
| W17 | SP-5V1-1 | FT450-A-A14 | 0.5 | no route | +5V sensor supply | — | |
| W18 | OEM-A-7 | FT450-A-A18 | 0.5 | no route | Crank position sensor (CKP) | — | |
| W19 | SP-0V-1 | FT450-A-A18 | 0.5 | no route | RPM reference (crank -) | — | |
| W20 | OEM-A-25 | FT450-A-A17 | 0.5 | no route | Camshaft position A (CMP A) | — | |
| W21 | OEM-A-30 | FT450-A-A8 | 0.5 | no route | Ignition coil 1 (IGPLS1) | — | |
| W22 | OEM-A-29 | FT450-A-A9 | 0.5 | no route | Ignition coil 2 (IGPLS2) | — | |
| W23 | OEM-A-28 | FT450-A-A10 | 0.5 | no route | Ignition coil 3 (IGPLS3) | — | |
| W24 | OEM-A-27 | FT450-A-A11 | 0.5 | no route | Ignition coil 4 (IGPLS4) | — | |
| W25 | OEM-B-5 | FT450-A-A1 | 0.5 | no route | Injector 1 (INJ1) | — | |
| W26 | OEM-B-4 | FT450-A-A2 | 0.5 | no route | Injector 2 (INJ2) | — | |
| W27 | OEM-B-3 | FT450-A-A1 | 0.5 | no route | Injector 3 (INJ3) | — | |
| W28 | OEM-B-2 | FT450-A-A2 | 0.5 | no route | Injector 4 (INJ4) | — | |
| W29 | OEM-E-7 | FT450-A-A6 | 0.5 | no route | Main relay control (MRLY) | — | |
| W30 | OEM-A-19 | FT450-A-A23 | 0.5 | no route | Manifold absolute pressure (MAP) | — | |
| W31 | OEM-A-15 | FT450-A-A20 | 0.5 | no route | Throttle position sensor (TPS) | — | |
| W32 | OEM-B-8 | FT450-A-A24 | 0.5 | no route | Coolant temp sensor (ECT) | — | |
| W33 | OEM-B-6 | FT450-A-A3 | 0.5 | no route | Radiator fan control (FANC) | — | |
| W34 | OEM-E-1 | FT450-A-A4 | 0.5 | no route | Immobilizer fuel pump relay (IMO FPR) | — | |
| W35 | OEM-E-18 | FT450-A-A5 | 0.5 | no route | A/C clutch relay (ACC) | — | |
| W36 | OEM-E-2 | FT450-A-A21 | 0.5 | no route | Secondary heated O2 sensor (SHO2S) | — | |
| W37 | OEM-B-17 | FT450-A-A26 | 0.5 | no route | Intake air temp sensor (IAT) | — | |
| W38 | OEM-B-13 | FT450-A-A22 | 0.5 | no route | Alternator FR signal (ALTF) | — | |
| W39 | OEM-E-14 | FT450-A-A25 | 0.5 | no route | Fuel tank pressure sensor (FTP) | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|---|---|---|---|---|
| connector | 1318682-6 | TE | K-series ECU harness plug A (040-3 HD plug assy, 31P) | 1.000 | ea |
| connector | 353029-1 | TE | K-series ECU harness plug B (040 H/D-3 plug HSG assy, 24P) | 1.000 | ea |
| connector | 353826-1 | TE | K-series ECU harness plug E (040 HD 31P plug HSG assy-B, 31P) | 1.000 | ea |
| terminal | 316836-1 | TE | Multilock 040 III HD socket, tin, 22–18 AWG (0.3–0.85 mm²) | 34.000 | ea |
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| No configured channels. | |||||||
Findings
Open (15)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | NET_MERGED | FT450-A-A1 + OEM-B-3 + OEM-B-5 | 2 different OEM functions share one net: OEM-B-3 Injector 3 (INJ3); OEM-B-5 Injector 1 (INJ1) |
| error | NET_MERGED | FT450-A-A2 + OEM-B-2 + OEM-B-4 | 2 different OEM functions share one net: OEM-B-2 Injector 4 (INJ4); OEM-B-4 Injector 2 (INJ2) |
| error | REQUIRED_UNMAPPED | OEM-A-26 | Required OEM function "Camshaft position B (CMP B)" (trigger_in) is not connected to the new ECU. |
| warn | DATASET_GAP | RSX ECU A | 5 of 31 cavities on RSX ECU A have no pin data (8,13,14,17,31). Anything there is invisible to these checks. |
| warn | DATASET_GAP | RSX ECU B | 8 of 24 cavities on RSX ECU B have no pin data (11,12,14,16,19,20,22,24). Anything there is invisible to these checks. |
| warn | DATASET_GAP | RSX ECU E | 8 of 31 cavities on RSX ECU E have no pin data (10,11,12,13,17,19,25,28). Anything there is invisible to these checks. |
| warn | LOAD_UNKNOWN | FT450-A-A1 | FT450-A-A1 "Injector 1 (Bank A)" drives OEM-B-3 Injector 3 (INJ3), OEM-B-5 Injector 1 (INJ1) (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-2 Injector 4 (INJ4), OEM-B-4 Injector 2 (INJ2) (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-B-6 Radiator fan control (FANC) (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-E-1 Immobilizer fuel pump relay (IMO FPR) (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-E-18 A/C clutch relay (ACC) (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-E-7 Main relay control (MRLY) (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | SUPPLY_GROUP | FT450-A-A14 + OEM-A-20 + OEM-A-21 + OEM-E-5 + SP-5V1-1 | Supplies meant to stay independent share one net: OEM-A-20 [k_vcc2], OEM-A-21 [k_vcc1], OEM-E-5 [k_vcc3]. 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 | FT450-A-A12 ↔ FT450-A-A18 | FT450-A-A12 "Signal ground" [sensor_ground] is wired to FT450-A-A18 "RPM reference (crank -)" [trigger_in]. Trigger return tied to sensor/trigger ground: correct for single-ended trigger inputs. |
| info | UNMAPPED | OEM | 30 optional OEM pins are not mapped: OEM-A-1 A/F sensor heater control (AFSHTC); OEM-A-12 Idle air control valve (IACV); OEM-A-16 A/F sensor - (AFS-, wideband Vs); OEM-A-18 Vehicle speed sensor (VSS, M/T); OEM-A-22 A/F sensor heater supply (AFSHTC+); OEM-A-6 A/F sensor + (AFS+, wideband Ip); OEM-A-9 Knock sensor (KS); OEM-B-1 VTC oil control solenoid (+); OEM-B-10 Alternator L signal (ALTL); OEM-B-15 VTEC solenoid (VTS); OEM-B-18 Alternator control (ALTC); OEM-B-21 Evap canister purge valve (PCS); OEM-B-23 VTC oil control solenoid (-); OEM-B-7 Reverse lockout solenoid (RVS, Type-S); OEM-B-9 VTEC oil pressure switch (VTPSW); OEM-E-15 Electrical load detector (ELD); OEM-E-16 Power steering pressure switch (PSPSW); OEM-E-20 Brake switch / interlock (2WBS); OEM-E-21 Evap vent shut valve (VSV); OEM-E-22 Brake switch (BKSW); OEM-E-23 K-line (diagnostic); OEM-E-24 Multiplex communication (SEFMJ); OEM-E-26 Engine speed pulse / tacho (NEP); OEM-E-27 Immobilizer code (IMOCD); OEM-E-29 Service check signal (SCS); OEM-E-30 Write enable signal (WEN); OEM-E-31 Malfunction indicator lamp (MIL); OEM-E-6 Secondary O2 heater control (SO2SHTC); OEM-E-8 A/F sensor heater relay control (AFSHTCR); OEM-E-9 Ignition switch signal (IG1) |
Accepted (0)
| Code | Subject | Reason | By |
|---|
Notes
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-A 26: Camshaft position B (CMP B): no free cam_hall/cam_vr/frequency_in input on FuelTech FT450 Not wired: - OEM-A 9: Knock sensor (KS): no free knock input on FuelTech FT450 - OEM-E 9: Ignition switch signal (IG1): key-on 12 V sense — optional in a swap (the main relay is energized from keyed 12 V, not from this pin); FuelTech FT450 has no dedicated key-on input - OEM-E 8: A/F sensor heater relay control (AFSHTCR): no free relay_control/low_side/heater_low_side/ls_hs/injector rated ≥ 0.2 A on FuelTech FT450 - OEM-E 6: Secondary O2 heater control (SO2SHTC): no free heater_low_side/low_side/relay_control/ls_hs/injector on FuelTech FT450 - OEM-A 1: A/F sensor heater control (AFSHTC): no free heater_low_side/low_side/relay_control/ls_hs/injector on FuelTech FT450 - OEM-A 12: Idle air control valve (IACV): no free low_side/relay_control/heater_low_side/ls_hs/injector rated ≥ 1.0 A on FuelTech FT450 - OEM-B 15: VTEC solenoid (VTS): no free low_side/relay_control/heater_low_side/ls_hs/injector rated ≥ 1.0 A on FuelTech FT450 - OEM-B 1: VTC oil control solenoid (+): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-B 18: Alternator control (ALTC): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-B 21: Evap canister purge valve (PCS): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-B 23: VTC oil control solenoid (-): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-B 7: Reverse lockout solenoid (RVS, Type-S): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-E 21: Evap vent shut valve (VSV): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-E 31: Malfunction indicator lamp (MIL): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-E 26: Engine speed pulse / tacho (NEP): no free tacho/frequency_out/low_side/ls_hs on FuelTech FT450 - OEM-A 6: A/F sensor + (AFS+, wideband Ip): no free wb_ip on FuelTech FT450 - OEM-A 16: A/F sensor - (AFS-, wideband Vs): no free wb_vs on FuelTech FT450 - OEM-A 22: A/F sensor heater supply (AFSHTC+): no free heater_feed on FuelTech FT450 - OEM-E 15: Electrical load detector (ELD): no free analog_0_5 on FuelTech FT450 - OEM-A 18: Vehicle speed sensor (VSS, M/T): no free frequency_in/switch_in on FuelTech FT450 - OEM-B 10: Alternator L signal (ALTL): no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-B 9: VTEC oil pressure switch (VTPSW): no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-E 16: Power steering pressure switch (PSPSW): no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-E 20: Brake switch / interlock (2WBS): no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-E 22: Brake switch (BKSW): no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-E 23: K-line (diagnostic): no free k_line on FuelTech FT450 - OEM-E 24: Multiplex communication (SEFMJ): no free k_line on FuelTech FT450 - OEM-E 27: Immobilizer code (IMOCD): not classified in the library; wire by hand - OEM-E 29: Service check signal (SCS): not classified in the library; wire by hand - OEM-E 30: Write enable signal (WEN): not classified in the library; wire by hand
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 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 | Link: CIVICLink K20X (HC20X) DC5 installation manual | https://linkecu.com/documentation/237-4000%20DC5.pdf | archive | 2026-10-05 | 8a1a71301571 |
| 3 | forum | FFS TechNet: K-series 02-06 RSX ECU pin diagram (Helm) | https://ff-squad.com/technet2/k-series-02-06-rsx-ecu-pin-diagram/ | archive | 2026-10-05 | b2b85002666e |