Lexus SC400 1998-2000 (1UZ-FE VVT-i) → FuelTech FT450 (auto)
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 | 13: read the Findings page before cutting any wire |
| Size of the job | 35 wires · 9 connectors · 0 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-E15-16 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | OEM-E15-7 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | OEM-E15-8 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | SP-14V-1 | FT450-A-A13 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-E13-17 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-E14-21 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | SP-GND-1 | FT450-A-A7 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | OEM-E13-18 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-E13-19 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-0V-1 | FT450-A-A12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-E13-2 | FT450-A-A14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-E14-10 | FT450-A-A17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-E14-11 | FT450-A-A8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-E14-12 | FT450-A-A9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-E14-13 | FT450-A-A10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-E14-14 | FT450-A-A11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-E13-5 | FT450-A-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-E13-6 | FT450-A-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-E14-1 | FT450-A-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-E14-2 | FT450-A-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-E14-3 | FT450-A-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-E14-4 | FT450-A-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-E14-5 | FT450-A-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-E14-6 | FT450-A-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-E11-19 | FT450-A-A3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-E14-20 | FT450-A-A4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-E13-10 | FT450-A-A20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-E13-13 | FT450-A-A21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-E13-21 | FT450-A-A22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-E13-20 | FT450-A-A23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-E13-9 | FT450-A-A25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-E13-14 | FT450-A-A24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-E15-10 | FT450-A-A6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-E15-5 | FT450-A-A5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-E13-22 | 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-A12 | FT450-A-A13 | open (OL) | sensor ground must not touch +12 V supply | |
| 2 | FT450-A-A12 | FT450-A-A14 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 3 | FT450-A-A14 | FT450-A-A13 | open (OL) | 5 V sensor reference must not touch +12 V supply | |
| 4 | FT450-A-A7 | FT450-A-A13 | open (OL) | power ground must not touch +12 V supply | |
| 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) | — | W17 | — | 0.5 | OEM-E13-5 | — | — | — |
| A1 | Injector 1 (Bank A) | — | W19 | — | 0.5 | OEM-E14-1 | — | — | — |
| A1 | Injector 1 (Bank A) | — | W21 | — | 0.5 | OEM-E14-3 | — | — | — |
| A1 | Injector 1 (Bank A) | — | W23 | — | 0.5 | OEM-E14-5 | — | — | — |
| A10 | Ignition 3 | — | W15 | — | 0.5 | OEM-E14-13 | — | — | — |
| A11 | Ignition 4 | — | W16 | — | 0.5 | OEM-E14-14 | — | — | — |
| A12 | Signal ground | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| A13 | +12V switched | — | W4 | — | 0.85 | SP-14V-1 | — | — | — |
| A14 | +5V sensor supply | — | W11 | — | 0.5 | OEM-E13-2 | — | — | — |
| A15 | CAN A LOW | — | — | — | — | — | — | — | — |
| A16 | CAN A HIGH | — | — | — | — | — | — | — | — |
| A17 | Phase input (cam) | — | W12 | — | 0.5 | OEM-E14-10 | — | — | — |
| A18 | RPM reference (crank -) | — | — | — | — | — | — | — | — |
| A19 | RPM signal (crank +) | — | — | — | — | — | — | — | — |
| A2 | Injector 2 (Bank A) | — | W18 | — | 0.5 | OEM-E13-6 | — | — | — |
| A2 | Injector 2 (Bank A) | — | W20 | — | 0.5 | OEM-E14-2 | — | — | — |
| A2 | Injector 2 (Bank A) | — | W22 | — | 0.5 | OEM-E14-4 | — | — | — |
| A2 | Injector 2 (Bank A) | — | W24 | — | 0.5 | OEM-E14-6 | — | — | — |
| A20 | White input 1 | — | W27 | — | 0.5 | OEM-E13-10 | — | — | — |
| A21 | White input 2 | — | W28 | — | 0.5 | OEM-E13-13 | — | — | — |
| A22 | White input 3 (TPS) | — | W29 | — | 0.5 | OEM-E13-21 | — | — | — |
| A23 | White input 4 (oil pressure) | — | W30 | — | 0.5 | OEM-E13-20 | — | — | — |
| A24 | White input 5 (water temp) | — | W32 | — | 0.5 | OEM-E13-14 | — | — | — |
| A25 | White input 6 (fuel pressure) | — | W31 | — | 0.5 | OEM-E13-9 | — | — | — |
| A26 | White input 7 (air temp) | — | W35 | — | 0.5 | OEM-E13-22 | — | — | — |
| A3 | Aux 1 | — | W25 | — | 0.5 | OEM-E11-19 | — | — | — |
| A4 | Aux 2 | — | W26 | — | 0.5 | OEM-E14-20 | — | — | — |
| A5 | Aux 3 | — | W34 | — | 0.5 | OEM-E15-5 | — | — | — |
| A6 | Aux 4 (fuel pump / relays) | — | W33 | — | 0.5 | OEM-E15-10 | — | — | — |
| A7 | Power ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| A8 | Ignition 1 | — | W13 | — | 0.5 | OEM-E14-11 | — | — | — |
| A9 | Ignition 2 | — | W14 | — | 0.5 | OEM-E14-12 | — | — | — |
OEM-E11
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 17 | Starter signal (STA) | — | — | — | — | — | — | — | — |
| 18 | O2 sensor signal (bank unconfirmed) | — | — | — | — | — | — | — | — |
| 19 | VVT oil-control valve RH (OCR+) | — | W25 | — | 0.5 | FT450-A-A3 | — | — | — |
| 27 | O2 sensor signal (bank unconfirmed) | — | — | — | — | — | — | — | — |
| 28 | VVT oil-control valve RH (OCR−) | — | — | — | — | — | — | — | — |
| 5 | Diagnostic test (TC) | — | — | — | — | — | — | — | — |
| 7 | O2 sensor heater (bank unconfirmed) | — | — | — | — | — | — | — | — |
| 8 | O2 sensor heater (bank unconfirmed) | — | — | — | — | — | — | — | — |
OEM-E12
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 12 | Throttle magnetic clutch + (CL+) | — | — | — | — | — | — | — | — |
OEM-E13
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 10 | MAF signal (VG) | — | W27 | — | 0.5 | FT450-A-A20 | — | — | — |
| 11 | O2 sensor signal (bank unconfirmed) | — | — | — | — | — | — | — | — |
| 12 | O2 sensor signal (bank unconfirmed) | — | — | — | — | — | — | — | — |
| 13 | Throttle position sensor 1 (VTA) | — | W28 | — | 0.5 | FT450-A-A21 | — | — | — |
| 14 | Engine coolant temp (THW) | — | W32 | — | 0.5 | FT450-A-A24 | — | — | — |
| 15 | VVT position sensor RH (VVR+) | — | — | — | — | — | — | — | — |
| 16 | VVT position sensor LH (VVL+) | — | — | — | — | — | — | — | — |
| 17 | ECU ground (E1) | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 18 | Sensor ground (E2) | — | W8 | — | 0.5 | SP-0V-1 | — | — | — |
| 19 | MAF ground (EVG) | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| 2 | +5V sensor reference (VC) | — | W11 | — | 0.5 | FT450-A-A14 | — | — | — |
| 20 | Throttle position sensor 2 (VTA2) | — | W30 | — | 0.5 | FT450-A-A23 | — | — | — |
| 21 | Accelerator pedal position 1 (VPA) | — | W29 | — | 0.5 | FT450-A-A22 | — | — | — |
| 22 | Intake air temp (THA) | — | W35 | — | 0.5 | FT450-A-A26 | — | — | — |
| 23 | VVT position sensor RH (VVR−) | — | — | — | — | — | — | — | — |
| 24 | VVT position sensor LH (VVL−) | — | — | — | — | — | — | — | — |
| 3 | O2 sensor heater (bank unconfirmed) | — | — | — | — | — | — | — | — |
| 4 | O2 sensor heater (bank unconfirmed) | — | — | — | — | — | — | — | — |
| 5 | Injector 1 (cyl 1) | — | W17 | — | 0.5 | FT450-A-A1 | — | — | — |
| 6 | Injector 2 (cyl 2) | — | W18 | — | 0.5 | FT450-A-A2 | — | — | — |
| 8 | Throttle magnetic clutch − (CL−) | — | — | — | — | — | — | — | — |
| 9 | Accelerator pedal position 2 (VPA2) | — | W31 | — | 0.5 | FT450-A-A25 | — | — | — |
OEM-E14
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injector 3 (cyl 3) | — | W19 | — | 0.5 | FT450-A-A1 | — | — | — |
| 10 | Camshaft position sensor (G2) | — | W12 | — | 0.5 | FT450-A-A17 | — | — | — |
| 11 | Ignition coil 1 (IGT1) | — | W13 | — | 0.5 | FT450-A-A8 | — | — | — |
| 12 | Ignition coil 2 (IGT2) | — | W14 | — | 0.5 | FT450-A-A9 | — | — | — |
| 13 | Ignition coil 3 (IGT3) | — | W15 | — | 0.5 | FT450-A-A10 | — | — | — |
| 14 | Ignition coil 4 (IGT4) | — | W16 | — | 0.5 | FT450-A-A11 | — | — | — |
| 15 | Ignition coil 5 (IGT5) | — | — | — | — | — | — | — | — |
| 16 | Ignition coil 6 (IGT6) | — | — | — | — | — | — | — | — |
| 17 | Knock sensor RH (KNKR) | — | — | — | — | — | — | — | — |
| 18 | Knock sensor LH (KNKL) | — | — | — | — | — | — | — | — |
| 19 | VVT oil-control valve LH (OCV−) | — | — | — | — | — | — | — | — |
| 2 | Injector 4 (cyl 4) | — | W20 | — | 0.5 | FT450-A-A2 | — | — | — |
| 20 | VVT oil-control valve LH (OCV+) | — | W26 | — | 0.5 | FT450-A-A4 | — | — | — |
| 21 | Power/injector ground (E01) | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 22 | Crank position sensor (NE−) | — | — | — | — | — | — | — | — |
| 23 | Crank position sensor (NE+) | — | — | — | — | — | — | — | — |
| 25 | Ignition coil 7 (IGT7) | — | — | — | — | — | — | — | — |
| 26 | Ignition coil 8 (IGT8) | — | — | — | — | — | — | — | — |
| 27 | Ignition confirmation 1 (IGF1) | — | — | — | — | — | — | — | — |
| 28 | Ignition confirmation 2 (IGF2) | — | — | — | — | — | — | — | — |
| 29 | ACIS induction VSV | — | — | — | — | — | — | — | — |
| 3 | Injector 5 (cyl 5) | — | W21 | — | 0.5 | FT450-A-A1 | — | — | — |
| 4 | Injector 6 (cyl 6) | — | W22 | — | 0.5 | FT450-A-A2 | — | — | — |
| 5 | Injector 7 (cyl 7) | — | W23 | — | 0.5 | FT450-A-A1 | — | — | — |
| 6 | Injector 8 (cyl 8) | — | W24 | — | 0.5 | FT450-A-A2 | — | — | — |
| 7 | Throttle motor − (M−) | — | — | — | — | — | — | — | — |
| 8 | Throttle motor + (M+) | — | — | — | — | — | — | — | — |
OEM-E15
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Battery constant (+12V) | — | — | — | — | — | — | — | — |
| 10 | EFI main relay control (MREL) | — | W33 | — | 0.5 | FT450-A-A6 | — | — | — |
| 11 | OBD-II / DLC3 data (SIL) | — | — | — | — | — | — | — | — |
| 16 | ECM power (EFI relay +B) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 5 | Fuel pump relay control (FC) | — | W34 | — | 0.5 | FT450-A-A5 | — | — | — |
| 6 | Check engine light (W) | — | — | — | — | — | — | — | — |
| 7 | ECM power feed (+BM) | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 8 | ECM power (EFI relay +B1) | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 9 | Ignition switch (+12V) | — | — | — | — | — | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W8 | — | 0.5 | OEM-E13-18 | — | — | — |
| 1 | — | — | W9 | — | 0.5 | OEM-E13-19 | — | — | — |
| 1 | — | — | W10 | — | 0.5 | FT450-A-A12 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-E15-16 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | OEM-E15-7 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | OEM-E15-8 | — | — | — |
| 1 | — | — | W4 | — | 0.85 | FT450-A-A13 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W5 | — | 0.85 | OEM-E13-17 | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-E14-21 | — | — | — |
| 1 | — | — | W7 | — | 0.85 | FT450-A-A7 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-E11-17 | Starter signal (STA) | digital_in | — | — | — | corroborated | |
| OEM-E11-18 | O2 sensor signal (bank unconfirmed) | lambda_nb_in | — | — | — | corroborated | |
| OEM-E11-19 | VVT oil-control valve RH (OCR+) | low_side_out | FT450-A-A3 | Aux 1 | low_side_out | corroborated | |
| OEM-E11-27 | O2 sensor signal (bank unconfirmed) | lambda_nb_in | — | — | — | corroborated | |
| OEM-E11-28 | VVT oil-control valve RH (OCR−) | low_side_out | — | — | — | corroborated | |
| OEM-E11-5 | Diagnostic test (TC) | serial | — | — | — | corroborated | |
| OEM-E11-7 | O2 sensor heater (bank unconfirmed) | low_side_out | — | — | — | corroborated | |
| OEM-E11-8 | O2 sensor heater (bank unconfirmed) | low_side_out | — | — | — | corroborated | |
| OEM-E12-12 | Throttle magnetic clutch + (CL+) | low_side_out | — | — | — | corroborated | |
| OEM-E13-10 | MAF signal (VG) | analog_in | FT450-A-A20 | White input 1 | analog_in | corroborated | |
| OEM-E13-11 | O2 sensor signal (bank unconfirmed) | lambda_nb_in | — | — | — | corroborated | |
| OEM-E13-12 | O2 sensor signal (bank unconfirmed) | lambda_nb_in | — | — | — | corroborated | |
| OEM-E13-13 | Throttle position sensor 1 (VTA) | analog_in | FT450-A-A21 | White input 2 | analog_in | corroborated | |
| OEM-E13-14 | Engine coolant temp (THW) | temp_in | FT450-A-A24 | White input 5 (water temp) | temp_in | corroborated | |
| OEM-E13-15 | VVT position sensor RH (VVR+) | trigger_in | — | — | — | corroborated | |
| OEM-E13-16 | VVT position sensor LH (VVL+) | trigger_in | — | — | — | corroborated | |
| OEM-E13-17 | ECU ground (E1) | ground | FT450-A-A7 | Power ground | ground | corroborated | |
| OEM-E13-18 | Sensor ground (E2) | sensor_ground | FT450-A-A12 | Signal ground | sensor_ground | corroborated | |
| OEM-E13-19 | MAF ground (EVG) | sensor_ground | FT450-A-A12 | Signal ground | sensor_ground | corroborated | |
| OEM-E13-2 | +5V sensor reference (VC) | vref | FT450-A-A14 | +5V sensor supply | vref | corroborated | |
| OEM-E13-20 | Throttle position sensor 2 (VTA2) | analog_in | FT450-A-A23 | White input 4 (oil pressure) | analog_in | corroborated | |
| OEM-E13-21 | Accelerator pedal position 1 (VPA) | analog_in | FT450-A-A22 | White input 3 (TPS) | analog_in | corroborated | |
| OEM-E13-22 | Intake air temp (THA) | temp_in | FT450-A-A26 | White input 7 (air temp) | temp_in | corroborated | |
| OEM-E13-23 | VVT position sensor RH (VVR−) | trigger_in | — | — | — | corroborated | |
| OEM-E13-24 | VVT position sensor LH (VVL−) | trigger_in | — | — | — | corroborated | |
| OEM-E13-3 | O2 sensor heater (bank unconfirmed) | low_side_out | — | — | — | corroborated | |
| OEM-E13-4 | O2 sensor heater (bank unconfirmed) | low_side_out | — | — | — | corroborated | |
| OEM-E13-5 | Injector 1 (cyl 1) | injector_out | FT450-A-A1 | Injector 1 (Bank A) | injector_out | corroborated | |
| OEM-E13-6 | Injector 2 (cyl 2) | injector_out | FT450-A-A2 | Injector 2 (Bank A) | injector_out | corroborated | |
| OEM-E13-8 | Throttle magnetic clutch − (CL−) | low_side_out | — | — | — | corroborated | |
| OEM-E13-9 | Accelerator pedal position 2 (VPA2) | analog_in | FT450-A-A25 | White input 6 (fuel pressure) | analog_in | corroborated | |
| OEM-E14-1 | Injector 3 (cyl 3) | injector_out | FT450-A-A1 | Injector 1 (Bank A) | injector_out | corroborated | |
| OEM-E14-10 | Camshaft position sensor (G2) | trigger_in | FT450-A-A17 | Phase input (cam) | trigger_in | corroborated | |
| OEM-E14-11 | Ignition coil 1 (IGT1) | ignition_out | FT450-A-A8 | Ignition 1 | ignition_out | corroborated | |
| OEM-E14-12 | Ignition coil 2 (IGT2) | ignition_out | FT450-A-A9 | Ignition 2 | ignition_out | corroborated | |
| OEM-E14-13 | Ignition coil 3 (IGT3) | ignition_out | FT450-A-A10 | Ignition 3 | ignition_out | corroborated | |
| OEM-E14-14 | Ignition coil 4 (IGT4) | ignition_out | FT450-A-A11 | Ignition 4 | ignition_out | corroborated | |
| OEM-E14-15 | Ignition coil 5 (IGT5) | ignition_out | — | — | — | corroborated | |
| OEM-E14-16 | Ignition coil 6 (IGT6) | ignition_out | — | — | — | corroborated | |
| OEM-E14-17 | Knock sensor RH (KNKR) | knock_in | — | — | — | corroborated | |
| OEM-E14-18 | Knock sensor LH (KNKL) | knock_in | — | — | — | corroborated | |
| OEM-E14-19 | VVT oil-control valve LH (OCV−) | low_side_out | — | — | — | corroborated | |
| OEM-E14-2 | Injector 4 (cyl 4) | injector_out | FT450-A-A2 | Injector 2 (Bank A) | injector_out | corroborated | |
| OEM-E14-20 | VVT oil-control valve LH (OCV+) | low_side_out | FT450-A-A4 | Aux 2 | low_side_out | corroborated | |
| OEM-E14-21 | Power/injector ground (E01) | ground | FT450-A-A7 | Power ground | ground | corroborated | |
| OEM-E14-22 | Crank position sensor (NE−) | trigger_in | — | — | — | corroborated | |
| OEM-E14-23 | Crank position sensor (NE+) | trigger_in | — | — | — | corroborated | |
| OEM-E14-25 | Ignition coil 7 (IGT7) | ignition_out | — | — | — | corroborated | |
| OEM-E14-26 | Ignition coil 8 (IGT8) | ignition_out | — | — | — | corroborated | |
| OEM-E14-27 | Ignition confirmation 1 (IGF1) | digital_in | — | — | — | corroborated | |
| OEM-E14-28 | Ignition confirmation 2 (IGF2) | digital_in | — | — | — | corroborated | |
| OEM-E14-29 | ACIS induction VSV | low_side_out | — | — | — | corroborated | |
| OEM-E14-3 | Injector 5 (cyl 5) | injector_out | FT450-A-A1 | Injector 1 (Bank A) | injector_out | corroborated | |
| OEM-E14-4 | Injector 6 (cyl 6) | injector_out | FT450-A-A2 | Injector 2 (Bank A) | injector_out | corroborated | |
| OEM-E14-5 | Injector 7 (cyl 7) | injector_out | FT450-A-A1 | Injector 1 (Bank A) | injector_out | corroborated | |
| OEM-E14-6 | Injector 8 (cyl 8) | injector_out | FT450-A-A2 | Injector 2 (Bank A) | injector_out | corroborated | |
| OEM-E14-7 | Throttle motor − (M−) | hbridge_out | — | — | — | corroborated | |
| OEM-E14-8 | Throttle motor + (M+) | hbridge_out | — | — | — | corroborated | |
| OEM-E15-1 | Battery constant (+12V) | power_in | — | — | — | corroborated | |
| OEM-E15-10 | EFI main relay control (MREL) | low_side_out | FT450-A-A6 | Aux 4 (fuel pump / relays) | low_side_out | corroborated | |
| OEM-E15-11 | OBD-II / DLC3 data (SIL) | serial | — | — | — | corroborated | |
| OEM-E15-16 | ECM power (EFI relay +B) | power_in | FT450-A-A13 | +12V switched | power_in | corroborated | |
| OEM-E15-5 | Fuel pump relay control (FC) | low_side_out | FT450-A-A5 | Aux 3 | low_side_out | corroborated | |
| OEM-E15-6 | Check engine light (W) | low_side_out | — | — | — | corroborated | |
| OEM-E15-7 | ECM power feed (+BM) | power_in | FT450-A-A13 | +12V switched | power_in | corroborated | |
| OEM-E15-8 | ECM power (EFI relay +B1) | power_in | FT450-A-A13 | +12V switched | power_in | corroborated | |
| OEM-E15-9 | Ignition switch (+12V) | digital_in | — | — | — | corroborated |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-E15-16 | SP-14V-1 | 0.85 | no route | ECM power (EFI relay +B) | — | |
| W2 | OEM-E15-7 | SP-14V-1 | 0.85 | no route | ECM power feed (+BM) | — | |
| W3 | OEM-E15-8 | SP-14V-1 | 0.85 | no route | ECM power (EFI relay +B1) | — | |
| W4 | SP-14V-1 | FT450-A-A13 | 0.85 | no route | +12V switched | — | |
| W5 | OEM-E13-17 | SP-GND-1 | 0.85 | no route | ECU ground (E1) | — | |
| W6 | OEM-E14-21 | SP-GND-1 | 0.85 | no route | Power/injector ground (E01) | — | |
| W7 | SP-GND-1 | FT450-A-A7 | 0.85 | no route | Power ground | — | |
| W8 | OEM-E13-18 | SP-0V-1 | 0.5 | no route | Sensor ground (E2) | — | |
| W9 | OEM-E13-19 | SP-0V-1 | 0.5 | no route | MAF ground (EVG) | — | |
| W10 | SP-0V-1 | FT450-A-A12 | 0.5 | no route | Signal ground | — | |
| W11 | OEM-E13-2 | FT450-A-A14 | 0.5 | no route | +5V sensor reference (VC) | — | |
| W12 | OEM-E14-10 | FT450-A-A17 | 0.5 | no route | Camshaft position sensor (G2) | — | |
| W13 | OEM-E14-11 | FT450-A-A8 | 0.5 | no route | Ignition coil 1 (IGT1) | — | |
| W14 | OEM-E14-12 | FT450-A-A9 | 0.5 | no route | Ignition coil 2 (IGT2) | — | |
| W15 | OEM-E14-13 | FT450-A-A10 | 0.5 | no route | Ignition coil 3 (IGT3) | — | |
| W16 | OEM-E14-14 | FT450-A-A11 | 0.5 | no route | Ignition coil 4 (IGT4) | — | |
| W17 | OEM-E13-5 | FT450-A-A1 | 0.5 | no route | Injector 1 (cyl 1) | — | |
| W18 | OEM-E13-6 | FT450-A-A2 | 0.5 | no route | Injector 2 (cyl 2) | — | |
| W19 | OEM-E14-1 | FT450-A-A1 | 0.5 | no route | Injector 3 (cyl 3) | — | |
| W20 | OEM-E14-2 | FT450-A-A2 | 0.5 | no route | Injector 4 (cyl 4) | — | |
| W21 | OEM-E14-3 | FT450-A-A1 | 0.5 | no route | Injector 5 (cyl 5) | — | |
| W22 | OEM-E14-4 | FT450-A-A2 | 0.5 | no route | Injector 6 (cyl 6) | — | |
| W23 | OEM-E14-5 | FT450-A-A1 | 0.5 | no route | Injector 7 (cyl 7) | — | |
| W24 | OEM-E14-6 | FT450-A-A2 | 0.5 | no route | Injector 8 (cyl 8) | — | |
| W25 | OEM-E11-19 | FT450-A-A3 | 0.5 | no route | VVT oil-control valve RH (OCR+) | — | |
| W26 | OEM-E14-20 | FT450-A-A4 | 0.5 | no route | VVT oil-control valve LH (OCV+) | — | |
| W27 | OEM-E13-10 | FT450-A-A20 | 0.5 | no route | MAF signal (VG) | — | |
| W28 | OEM-E13-13 | FT450-A-A21 | 0.5 | no route | Throttle position sensor 1 (VTA) | — | |
| W29 | OEM-E13-21 | FT450-A-A22 | 0.5 | no route | Accelerator pedal position 1 (VPA) | — | |
| W30 | OEM-E13-20 | FT450-A-A23 | 0.5 | no route | Throttle position sensor 2 (VTA2) | — | |
| W31 | OEM-E13-9 | FT450-A-A25 | 0.5 | no route | Accelerator pedal position 2 (VPA2) | — | |
| W32 | OEM-E13-14 | FT450-A-A24 | 0.5 | no route | Engine coolant temp (THW) | — | |
| W33 | OEM-E15-10 | FT450-A-A6 | 0.5 | no route | EFI main relay control (MREL) | — | |
| W34 | OEM-E15-5 | FT450-A-A5 | 0.5 | no route | Fuel pump relay control (FC) | — | |
| W35 | OEM-E13-22 | FT450-A-A26 | 0.5 | no route | Intake air temp (THA) | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| No configured channels. | |||||||
Findings
Open (16)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | NET_MERGED | FT450-A-A1 + OEM-E13-5 + OEM-E14-1 + OEM-E14-3 + OEM-E14-5 | 4 different OEM functions share one net: OEM-E13-5 Injector 1 (cyl 1); OEM-E14-1 Injector 3 (cyl 3); OEM-E14-3 Injector 5 (cyl 5); OEM-E14-5 Injector 7 (cyl 7) |
| error | NET_MERGED | FT450-A-A2 + OEM-E13-6 + OEM-E14-2 + OEM-E14-4 + OEM-E14-6 | 4 different OEM functions share one net: OEM-E13-6 Injector 2 (cyl 2); OEM-E14-2 Injector 4 (cyl 4); OEM-E14-4 Injector 6 (cyl 6); OEM-E14-6 Injector 8 (cyl 8) |
| error | REQUIRED_UNMAPPED | OEM-E14-15 | Required OEM function "Ignition coil 5 (IGT5)" (ignition_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-E14-16 | Required OEM function "Ignition coil 6 (IGT6)" (ignition_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-E14-17 | Required OEM function "Knock sensor RH (KNKR)" (knock_in) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-E14-18 | Required OEM function "Knock sensor LH (KNKL)" (knock_in) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-E14-22 | Required OEM function "Crank position sensor (NE−)" (trigger_in) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-E14-23 | Required OEM function "Crank position sensor (NE+)" (trigger_in) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-E14-25 | Required OEM function "Ignition coil 7 (IGT7)" (ignition_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-E14-26 | Required OEM function "Ignition coil 8 (IGT8)" (ignition_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-E14-7 | Required OEM function "Throttle motor − (M−)" (hbridge_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-E14-8 | Required OEM function "Throttle motor + (M+)" (hbridge_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-E15-9 | Required OEM function "Ignition switch (+12V)" (digital_in) is not connected to the new ECU. |
| warn | LOAD_UNKNOWN | FT450-A-A5 | FT450-A-A5 "Aux 3" drives OEM-E15-5 Fuel pump relay control (FC) (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-E15-10 EFI main relay control (MREL) (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| info | UNMAPPED | OEM | 23 optional OEM pins are not mapped: OEM-E11-17 Starter signal (STA); OEM-E11-18 O2 sensor signal (bank unconfirmed); OEM-E11-27 O2 sensor signal (bank unconfirmed); OEM-E11-28 VVT oil-control valve RH (OCR−); OEM-E11-5 Diagnostic test (TC); OEM-E11-7 O2 sensor heater (bank unconfirmed); OEM-E11-8 O2 sensor heater (bank unconfirmed); OEM-E12-12 Throttle magnetic clutch + (CL+); OEM-E13-11 O2 sensor signal (bank unconfirmed); OEM-E13-12 O2 sensor signal (bank unconfirmed); OEM-E13-15 VVT position sensor RH (VVR+); OEM-E13-16 VVT position sensor LH (VVL+); OEM-E13-23 VVT position sensor RH (VVR−); OEM-E13-24 VVT position sensor LH (VVL−); OEM-E13-3 O2 sensor heater (bank unconfirmed); OEM-E13-4 O2 sensor heater (bank unconfirmed); OEM-E13-8 Throttle magnetic clutch − (CL−); OEM-E14-19 VVT oil-control valve LH (OCV−); OEM-E14-27 Ignition confirmation 1 (IGF1); OEM-E14-28 Ignition confirmation 2 (IGF2); OEM-E14-29 ACIS induction VSV; OEM-E15-11 OBD-II / DLC3 data (SIL); OEM-E15-6 Check engine light (W) |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-E15-1 | 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: needs add-on. Resolve these before building: - No drive-by-wire; needs a cable-throttle conversion or an external DBW controller - No knock input; the stock knock sensor would be unused - Only 4 ignition outputs for 8 cylinders: wasted spark (pair coils per firing order) - Only 6 injector outputs for 8 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-E14 22: Crank position sensor (NE−): 2 stock pins named "Crank position sensor" without a documented polarity / pairing; wire by hand - OEM-E14 23: Crank position sensor (NE+): 2 stock pins named "Crank position sensor" without a documented polarity / pairing; wire by hand - OEM-E14 18: Knock sensor LH (KNKL): no free knock input on FuelTech FT450 - OEM-E14 17: Knock sensor RH (KNKR): no free knock input on FuelTech FT450 - OEM-E14 15: Ignition coil 5 (IGT5): no free ignition output on FuelTech FT450 - OEM-E14 16: Ignition coil 6 (IGT6): no free ignition output on FuelTech FT450 - OEM-E14 25: Ignition coil 7 (IGT7): no free ignition output on FuelTech FT450 - OEM-E14 26: Ignition coil 8 (IGT8): no free ignition output on FuelTech FT450 - OEM-E14 7: Throttle motor − (M−): needs a paired H-bridge on FuelTech FT450 (H-bridge pairing not in the library: set device_pin.bridge_pair from the ECU manual) - OEM-E14 8: Throttle motor + (M+): needs a paired H-bridge on FuelTech FT450 (H-bridge pairing not in the library: set device_pin.bridge_pair from the ECU manual) - OEM-E15 9: Ignition switch (+12V): 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 Not wired: - OEM-E15 1: Battery constant (+12V): FuelTech FT450 has no battery-constant input; not needed - OEM-E13 16: VVT position sensor LH (VVL+): no free cam_hall/cam_vr/frequency_in input on FuelTech FT450 - OEM-E13 24: VVT position sensor LH (VVL−): no free cam_hall/cam_vr/frequency_in input on FuelTech FT450 - OEM-E13 15: VVT position sensor RH (VVR+): no free cam_hall/cam_vr/frequency_in input on FuelTech FT450 - OEM-E13 23: VVT position sensor RH (VVR−): no free cam_hall/cam_vr/frequency_in input on FuelTech FT450 - OEM-E11 7: O2 sensor heater (bank unconfirmed): no free heater_low_side/low_side/relay_control/ls_hs/injector on FuelTech FT450 - OEM-E11 8: O2 sensor heater (bank unconfirmed): no free heater_low_side/low_side/relay_control/ls_hs/injector on FuelTech FT450 - OEM-E13 3: O2 sensor heater (bank unconfirmed): no free heater_low_side/low_side/relay_control/ls_hs/injector on FuelTech FT450 - OEM-E13 4: O2 sensor heater (bank unconfirmed): no free heater_low_side/low_side/relay_control/ls_hs/injector on FuelTech FT450 - OEM-E11 28: VVT oil-control valve RH (OCR−): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-E12 12: Throttle magnetic clutch + (CL+): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-E13 8: Throttle magnetic clutch − (CL−): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-E14 19: VVT oil-control valve LH (OCV−): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-E14 29: ACIS induction VSV: no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-E15 6: Check engine light (W): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-E11 18: O2 sensor signal (bank unconfirmed): no free o2_narrowband/analog_0_5 on FuelTech FT450 - OEM-E11 27: O2 sensor signal (bank unconfirmed): no free o2_narrowband/analog_0_5 on FuelTech FT450 - OEM-E13 11: O2 sensor signal (bank unconfirmed): no free o2_narrowband/analog_0_5 on FuelTech FT450 - OEM-E13 12: O2 sensor signal (bank unconfirmed): no free o2_narrowband/analog_0_5 on FuelTech FT450 - OEM-E14 27: Ignition confirmation 1 (IGF1): no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-E14 28: Ignition confirmation 2 (IGF2): no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-E11 17: Starter signal (STA): no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-E15 11: OBD-II / DLC3 data (SIL): no free k_line on FuelTech FT450 - OEM-E11 5: Diagnostic test (TC): no free k_line on FuelTech FT450
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 | Toyota 1UZ-FE (VVT-i) engine manual M1UZ | http://www.epicmarine.com/docs/M1UZrm.pdf | — | — | — |
| 3 | community_copy | 1998 Lexus LS400 ECM terminal voltage chart (RM717U translation) | https://www.renrendoc.com/p-59096353.html | — | — | — |