Lexus LS400 1989-97 (1UZ-FE non-VVTi) → FuelTech FT450 (auto)
Lexus LS400 1989-97 (1UZ-FE non-VVTi) — FuelTech — FT450
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 2026-10-12
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 | 4: read the Findings page before cutting any wire |
| Size of the job | 32 wires · 8 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-A-12 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | OEM-A-13 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-14V-1 | FT450-A-A13 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-A-22 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-D-13 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-D-26 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | SP-GND-1 | FT450-A-A7 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | OEM-A-18 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-C-15 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-C-16 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-0V-1 | FT450-A-A12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-A-11 | FT450-A-A14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-C-8 | FT450-A-A18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | SP-0V-1 | FT450-A-A18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-C-7 | FT450-A-A17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-C-5 | FT450-A-A8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-C-13 | FT450-A-A9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-D-12 | FT450-A-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-D-11 | FT450-A-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-D-24 | FT450-A-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-D-25 | FT450-A-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-A-4 | FT450-A-A20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-A-5 | FT450-A-A24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-B-4 | FT450-A-A6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-B-6 | FT450-A-A3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-B-7 | FT450-A-A4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-D-19 | FT450-A-A5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-A-17 | FT450-A-A21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-A-6 | FT450-A-A22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-B-11 | FT450-A-A23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-B-24 | FT450-A-A25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-A-16 | 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-A14 | FT450-A-A12 | open (OL) | 5 V sensor reference must not touch sensor ground | |
| 4 | FT450-A-A14 | FT450-A-A7 | open (OL) | 5 V sensor reference must not touch power ground | |
| 5 | FT450-A-A14 | FT450-A-A13 | open (OL) | 5 V sensor reference must not touch +12 V supply |
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) | — | W18 | — | 0.5 | OEM-D-12 | — | — | — |
| A1 | Injector 1 (Bank A) | — | W20 | — | 0.5 | OEM-D-24 | — | — | — |
| A10 | Ignition 3 | — | — | — | — | — | — | — | — |
| A11 | Ignition 4 | — | — | — | — | — | — | — | — |
| A12 | Signal ground | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| A13 | +12V switched | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| A14 | +5V sensor supply | — | W12 | — | 0.5 | OEM-A-11 | — | — | — |
| A15 | CAN A LOW | — | — | — | — | — | — | — | — |
| A16 | CAN A HIGH | — | — | — | — | — | — | — | — |
| A17 | Phase input (cam) | — | W15 | — | 0.5 | OEM-C-7 | — | — | — |
| A18 | RPM reference (crank -) | — | W13 | — | 0.5 | OEM-C-8 | — | — | — |
| A18 | RPM reference (crank -) | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| A19 | RPM signal (crank +) | — | — | — | — | — | — | — | — |
| A2 | Injector 2 (Bank A) | — | W19 | — | 0.5 | OEM-D-11 | — | — | — |
| A2 | Injector 2 (Bank A) | — | W21 | — | 0.5 | OEM-D-25 | — | — | — |
| A20 | White input 1 | — | W22 | — | 0.5 | OEM-A-4 | — | — | — |
| A21 | White input 2 | — | W28 | — | 0.5 | OEM-A-17 | — | — | — |
| A22 | White input 3 (TPS) | — | W29 | — | 0.5 | OEM-A-6 | — | — | — |
| A23 | White input 4 (oil pressure) | — | W30 | — | 0.5 | OEM-B-11 | — | — | — |
| A24 | White input 5 (water temp) | — | W23 | — | 0.5 | OEM-A-5 | — | — | — |
| A25 | White input 6 (fuel pressure) | — | W31 | — | 0.5 | OEM-B-24 | — | — | — |
| A26 | White input 7 (air temp) | — | W32 | — | 0.5 | OEM-A-16 | — | — | — |
| A3 | Aux 1 | — | W25 | — | 0.5 | OEM-B-6 | — | — | — |
| A4 | Aux 2 | — | W26 | — | 0.5 | OEM-B-7 | — | — | — |
| A5 | Aux 3 | — | W27 | — | 0.5 | OEM-D-19 | — | — | — |
| A6 | Aux 4 (fuel pump / relays) | — | W24 | — | 0.5 | OEM-B-4 | — | — | — |
| A7 | Power ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| A8 | Ignition 1 | — | W16 | — | 0.5 | OEM-C-5 | — | — | — |
| A9 | Ignition 2 | — | W17 | — | 0.5 | OEM-C-13 | — | — | — |
OEM-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Ignition switch (IGSW) | — | — | — | — | — | — | — | — |
| 11 | Sensor supply +5V (VC) | — | W12 | — | 0.5 | FT450-A-A14 | — | — | — |
| 12 | EFI main relay (B+) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 13 | EFI main relay (B1+) | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 14 | Neutral start switch (NSW) | — | — | — | — | — | — | — | — |
| 16 | Intake air temperature (THA) | — | W32 | — | 0.5 | FT450-A-A26 | — | — | — |
| 17 | O2 right front (OXR1) | — | W28 | — | 0.5 | FT450-A-A21 | — | — | — |
| 18 | Sensor ground (E2) | — | W8 | — | 0.5 | SP-0V-1 | — | — | — |
| 19 | Vehicle speed (SPD) | — | — | — | — | — | — | — | — |
| 2 | Starter signal (STA) | — | — | — | — | — | — | — | — |
| 20 | Diagnostic test 2 (TE2) | — | — | — | — | — | — | — | — |
| 22 | Power ground (E1) | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| 4 | Throttle position (VTA1) | — | W22 | — | 0.5 | FT450-A-A20 | — | — | — |
| 5 | Coolant temperature (THW) | — | W23 | — | 0.5 | FT450-A-A24 | — | — | — |
| 6 | O2 left front (OXL1) | — | W29 | — | 0.5 | FT450-A-A22 | — | — | — |
| 7 | EGR temperature sensor | — | — | — | — | — | — | — | — |
| 8 | Knock/shield (KS) | — | — | — | — | — | — | — | — |
| 9 | Diagnostic test 1 (TE1) | — | — | — | — | — | — | — | — |
OEM-B
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 11 | O2 right rear (OXR2) | — | W30 | — | 0.5 | FT450-A-A23 | — | — | — |
| 19 | Stop light switch (BK) | — | — | — | — | — | — | — | — |
| 20 | A/T kickdown switch (KD) | — | — | — | — | — | — | — | — |
| 23 | A/C request (AC) | — | — | — | — | — | — | — | — |
| 24 | O2 left rear (OXL2) | — | W31 | — | 0.5 | FT450-A-A25 | — | — | — |
| 26 | Battery constant (BATT) | — | — | — | — | — | — | — | — |
| 4 | EFI main relay control (MREL) | — | W24 | — | 0.5 | FT450-A-A6 | — | — | — |
| 5 | Check-engine lamp (W) | — | — | — | — | — | — | — | — |
| 6 | Fuel pump relay (FPR) | — | W25 | — | 0.5 | FT450-A-A3 | — | — | — |
| 7 | A/C clutch relay (ACMG) | — | W26 | — | 0.5 | FT450-A-A4 | — | — | — |
| 8 | Fuel pump control (FC) | — | — | — | — | — | — | — | — |
OEM-C
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | TPS idle switch (IDL) | — | — | — | — | — | — | — | — |
| 10 | Igniter 2 feedback (IGF2) | — | — | — | — | — | — | — | — |
| 11 | Knock sensor 2 (KNK2) | — | — | — | — | — | — | — | — |
| 12 | Check connector VF2 | — | — | — | — | — | — | — | — |
| 13 | Ignition 2 (IGT2) | — | W17 | — | 0.5 | FT450-A-A9 | — | — | — |
| 15 | Cam sensor ground (G-) | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| 16 | Crank sensor - (NE-) | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| 2 | Igniter 1 feedback (IGF1) | — | — | — | — | — | — | — | — |
| 3 | Knock sensor 1 (KNK1) | — | — | — | — | — | — | — | — |
| 4 | Check connector VF1 | — | — | — | — | — | — | — | — |
| 5 | Ignition 1 (IGT1) | — | W16 | — | 0.5 | FT450-A-A8 | — | — | — |
| 6 | Cam sensor 2 + (G2+) | — | — | — | — | — | — | — | — |
| 7 | Cam sensor 1 + (G1+) | — | W15 | — | 0.5 | FT450-A-A17 | — | — | — |
| 8 | Crank sensor + (NE+) | — | W13 | — | 0.5 | FT450-A-A18 | — | — | — |
OEM-D
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 11 | Injector 2&8 (#20) | — | W19 | — | 0.5 | FT450-A-A2 | — | — | — |
| 12 | Injector 1&7 (#10) | — | W18 | — | 0.5 | FT450-A-A1 | — | — | — |
| 13 | Power ground (E01) | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 17 | Cold start injector 1 (STJ1) | — | — | — | — | — | — | — | — |
| 19 | O2 heater 2 (HT2) | — | W27 | — | 0.5 | FT450-A-A5 | — | — | — |
| 20 | O2 heater 1 (HT1) | — | — | — | — | — | — | — | — |
| 21 | EGR solenoid | — | — | — | — | — | — | — | — |
| 22 | Fuel pressure-up VSV (PR) | — | — | — | — | — | — | — | — |
| 24 | Injector 3&5 (#40) | — | W20 | — | 0.5 | FT450-A-A1 | — | — | — |
| 25 | Injector 4&6 (#30) | — | W21 | — | 0.5 | FT450-A-A2 | — | — | — |
| 26 | Power ground (E02) | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 4 | Cold start injector (STJ) | — | — | — | — | — | — | — | — |
| 5 | ISC stepper coil 4 (ISC4) | — | — | — | — | — | — | — | — |
| 6 | ISC stepper coil 3 (ISC3) | — | — | — | — | — | — | — | — |
| 7 | ISC stepper coil 2 (ISC2) | — | — | — | — | — | — | — | — |
| 8 | ISC stepper coil 1 (ISC1) | — | — | — | — | — | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W8 | — | 0.5 | OEM-A-18 | — | — | — |
| 1 | — | — | W9 | — | 0.5 | OEM-C-15 | — | — | — |
| 1 | — | — | W10 | — | 0.5 | OEM-C-16 | — | — | — |
| 1 | — | — | W11 | — | 0.5 | FT450-A-A12 | — | — | — |
| 1 | — | — | W14 | — | 0.5 | FT450-A-A18 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-A-12 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | OEM-A-13 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | FT450-A-A13 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W4 | — | 0.85 | OEM-A-22 | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-D-13 | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-D-26 | — | — | — |
| 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-A-1 | Ignition switch (IGSW) | digital_in | — | — | — | single_source | |
| OEM-A-11 | Sensor supply +5V (VC) | vref | FT450-A-A14 | +5V sensor supply | vref | single_source | |
| OEM-A-12 | EFI main relay (B+) | power_in | FT450-A-A13 | +12V switched | power_in | single_source | |
| OEM-A-13 | EFI main relay (B1+) | power_in | FT450-A-A13 | +12V switched | power_in | single_source | |
| OEM-A-14 | Neutral start switch (NSW) | digital_in | — | — | — | single_source | |
| OEM-A-16 | Intake air temperature (THA) | temp_in | FT450-A-A26 | White input 7 (air temp) | temp_in | single_source | |
| OEM-A-17 | O2 right front (OXR1) | lambda_nb_in | FT450-A-A21 | White input 2 | analog_in | single_source | |
| OEM-A-18 | Sensor ground (E2) | sensor_ground | FT450-A-A12 + FT450-A-A18 | Signal ground + RPM reference (crank -) | sensor_ground + trigger_in | single_source | |
| OEM-A-19 | Vehicle speed (SPD) | digital_in | — | — | — | single_source | |
| OEM-A-2 | Starter signal (STA) | digital_in | — | — | — | single_source | |
| OEM-A-20 | Diagnostic test 2 (TE2) | digital_in | — | — | — | single_source | |
| OEM-A-22 | Power ground (E1) | ground | FT450-A-A7 | Power ground | ground | single_source | |
| OEM-A-4 | Throttle position (VTA1) | analog_in | FT450-A-A20 | White input 1 | analog_in | single_source | |
| OEM-A-5 | Coolant temperature (THW) | temp_in | FT450-A-A24 | White input 5 (water temp) | temp_in | single_source | |
| OEM-A-6 | O2 left front (OXL1) | lambda_nb_in | FT450-A-A22 | White input 3 (TPS) | analog_in | single_source | |
| OEM-A-7 | EGR temperature sensor | temp_in | — | — | — | single_source | |
| OEM-A-8 | Knock/shield (KS) | knock_in | — | — | — | single_source | |
| OEM-A-9 | Diagnostic test 1 (TE1) | digital_in | — | — | — | single_source | |
| OEM-B-11 | O2 right rear (OXR2) | lambda_nb_in | FT450-A-A23 | White input 4 (oil pressure) | analog_in | single_source | |
| OEM-B-19 | Stop light switch (BK) | digital_in | — | — | — | single_source | |
| OEM-B-20 | A/T kickdown switch (KD) | digital_in | — | — | — | single_source | |
| OEM-B-23 | A/C request (AC) | digital_in | — | — | — | single_source | |
| OEM-B-24 | O2 left rear (OXL2) | lambda_nb_in | FT450-A-A25 | White input 6 (fuel pressure) | analog_in | single_source | |
| OEM-B-26 | Battery constant (BATT) | power_in | — | — | — | single_source | |
| OEM-B-4 | EFI main relay control (MREL) | low_side_out | FT450-A-A6 | Aux 4 (fuel pump / relays) | low_side_out | single_source | |
| OEM-B-5 | Check-engine lamp (W) | low_side_out | — | — | — | single_source | |
| OEM-B-6 | Fuel pump relay (FPR) | low_side_out | FT450-A-A3 | Aux 1 | low_side_out | single_source | |
| OEM-B-7 | A/C clutch relay (ACMG) | low_side_out | FT450-A-A4 | Aux 2 | low_side_out | single_source | |
| OEM-B-8 | Fuel pump control (FC) | low_side_out | — | — | — | single_source | |
| OEM-C-1 | TPS idle switch (IDL) | digital_in | — | — | — | single_source | |
| OEM-C-10 | Igniter 2 feedback (IGF2) | digital_in | — | — | — | single_source | |
| OEM-C-11 | Knock sensor 2 (KNK2) | knock_in | — | — | — | single_source | |
| OEM-C-12 | Check connector VF2 | analog_out | — | — | — | single_source | |
| OEM-C-13 | Ignition 2 (IGT2) | ignition_out | FT450-A-A9 | Ignition 2 | ignition_out | single_source | |
| OEM-C-15 | Cam sensor ground (G-) | sensor_ground | FT450-A-A12 + FT450-A-A18 | Signal ground + RPM reference (crank -) | sensor_ground + trigger_in | single_source | |
| OEM-C-16 | Crank sensor - (NE-) | sensor_ground | FT450-A-A12 + FT450-A-A18 | Signal ground + RPM reference (crank -) | sensor_ground + trigger_in | single_source | |
| OEM-C-2 | Igniter 1 feedback (IGF1) | digital_in | — | — | — | single_source | |
| OEM-C-3 | Knock sensor 1 (KNK1) | knock_in | — | — | — | single_source | |
| OEM-C-4 | Check connector VF1 | analog_out | — | — | — | single_source | |
| OEM-C-5 | Ignition 1 (IGT1) | ignition_out | FT450-A-A8 | Ignition 1 | ignition_out | single_source | |
| OEM-C-6 | Cam sensor 2 + (G2+) | trigger_in | — | — | — | single_source | |
| OEM-C-7 | Cam sensor 1 + (G1+) | trigger_in | FT450-A-A17 | Phase input (cam) | trigger_in | single_source | |
| OEM-C-8 | Crank sensor + (NE+) | trigger_in | FT450-A-A12 + FT450-A-A18 | Signal ground + RPM reference (crank -) | sensor_ground + trigger_in | single_source | |
| OEM-D-11 | Injector 2&8 (#20) | injector_out | FT450-A-A2 | Injector 2 (Bank A) | injector_out | single_source | |
| OEM-D-12 | Injector 1&7 (#10) | injector_out | FT450-A-A1 | Injector 1 (Bank A) | injector_out | single_source | |
| OEM-D-13 | Power ground (E01) | ground | FT450-A-A7 | Power ground | ground | single_source | |
| OEM-D-17 | Cold start injector 1 (STJ1) | low_side_out | — | — | — | single_source | |
| OEM-D-19 | O2 heater 2 (HT2) | low_side_out | FT450-A-A5 | Aux 3 | low_side_out | single_source | |
| OEM-D-20 | O2 heater 1 (HT1) | low_side_out | — | — | — | single_source | |
| OEM-D-21 | EGR solenoid | low_side_out | — | — | — | single_source | |
| OEM-D-22 | Fuel pressure-up VSV (PR) | low_side_out | — | — | — | single_source | |
| OEM-D-24 | Injector 3&5 (#40) | injector_out | FT450-A-A1 | Injector 1 (Bank A) | injector_out | single_source | |
| OEM-D-25 | Injector 4&6 (#30) | injector_out | FT450-A-A2 | Injector 2 (Bank A) | injector_out | single_source | |
| OEM-D-26 | Power ground (E02) | ground | FT450-A-A7 | Power ground | ground | single_source | |
| OEM-D-4 | Cold start injector (STJ) | low_side_out | — | — | — | single_source | |
| OEM-D-5 | ISC stepper coil 4 (ISC4) | low_side_out | — | — | — | single_source | |
| OEM-D-6 | ISC stepper coil 3 (ISC3) | low_side_out | — | — | — | single_source | |
| OEM-D-7 | ISC stepper coil 2 (ISC2) | low_side_out | — | — | — | single_source | |
| OEM-D-8 | ISC stepper coil 1 (ISC1) | low_side_out | — | — | — | single_source |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-A-12 | SP-14V-1 | 0.85 | no route | EFI main relay (B+) | — | |
| W2 | OEM-A-13 | SP-14V-1 | 0.85 | no route | EFI main relay (B1+) | — | |
| W3 | SP-14V-1 | FT450-A-A13 | 0.85 | no route | +12V switched | — | |
| W4 | OEM-A-22 | SP-GND-1 | 0.85 | no route | Power ground (E1) | — | |
| W5 | OEM-D-13 | SP-GND-1 | 0.85 | no route | Power ground (E01) | — | |
| W6 | OEM-D-26 | SP-GND-1 | 0.85 | no route | Power ground (E02) | — | |
| W7 | SP-GND-1 | FT450-A-A7 | 0.85 | no route | Power ground | — | |
| W8 | OEM-A-18 | SP-0V-1 | 0.5 | no route | Sensor ground (E2) | — | |
| W9 | OEM-C-15 | SP-0V-1 | 0.5 | no route | Cam sensor ground (G-) | — | |
| W10 | OEM-C-16 | SP-0V-1 | 0.5 | no route | Crank sensor - (NE-) | — | |
| W11 | SP-0V-1 | FT450-A-A12 | 0.5 | no route | Signal ground | — | |
| W12 | OEM-A-11 | FT450-A-A14 | 0.5 | no route | Sensor supply +5V (VC) | — | |
| W13 | OEM-C-8 | FT450-A-A18 | 0.5 | no route | Crank sensor + (NE+) | — | |
| W14 | SP-0V-1 | FT450-A-A18 | 0.5 | no route | RPM reference (crank -) | — | |
| W15 | OEM-C-7 | FT450-A-A17 | 0.5 | no route | Cam sensor 1 + (G1+) | — | |
| W16 | OEM-C-5 | FT450-A-A8 | 0.5 | no route | Ignition 1 (IGT1) | — | |
| W17 | OEM-C-13 | FT450-A-A9 | 0.5 | no route | Ignition 2 (IGT2) | — | |
| W18 | OEM-D-12 | FT450-A-A1 | 0.5 | no route | Injector 1&7 (#10) | — | |
| W19 | OEM-D-11 | FT450-A-A2 | 0.5 | no route | Injector 2&8 (#20) | — | |
| W20 | OEM-D-24 | FT450-A-A1 | 0.5 | no route | Injector 3&5 (#40) | — | |
| W21 | OEM-D-25 | FT450-A-A2 | 0.5 | no route | Injector 4&6 (#30) | — | |
| W22 | OEM-A-4 | FT450-A-A20 | 0.5 | no route | Throttle position (VTA1) | — | |
| W23 | OEM-A-5 | FT450-A-A24 | 0.5 | no route | Coolant temperature (THW) | — | |
| W24 | OEM-B-4 | FT450-A-A6 | 0.5 | no route | EFI main relay control (MREL) | — | |
| W25 | OEM-B-6 | FT450-A-A3 | 0.5 | no route | Fuel pump relay (FPR) | — | |
| W26 | OEM-B-7 | FT450-A-A4 | 0.5 | no route | A/C clutch relay (ACMG) | — | |
| W27 | OEM-D-19 | FT450-A-A5 | 0.5 | no route | O2 heater 2 (HT2) | — | |
| W28 | OEM-A-17 | FT450-A-A21 | 0.5 | no route | O2 right front (OXR1) | — | |
| W29 | OEM-A-6 | FT450-A-A22 | 0.5 | no route | O2 left front (OXL1) | — | |
| W30 | OEM-B-11 | FT450-A-A23 | 0.5 | no route | O2 right rear (OXR2) | — | |
| W31 | OEM-B-24 | FT450-A-A25 | 0.5 | no route | O2 left rear (OXL2) | — | |
| W32 | OEM-A-16 | FT450-A-A26 | 0.5 | no route | Intake air temperature (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 (9)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | NET_MERGED | FT450-A-A1 + OEM-D-12 + OEM-D-24 | 2 different OEM functions share one net: OEM-D-12 Injector 1&7 (#10); OEM-D-24 Injector 3&5 (#40) |
| error | NET_MERGED | FT450-A-A2 + OEM-D-11 + OEM-D-25 | 2 different OEM functions share one net: OEM-D-11 Injector 2&8 (#20); OEM-D-25 Injector 4&6 (#30) |
| error | REQUIRED_UNMAPPED | OEM-A-1 | Required OEM function "Ignition switch (IGSW)" (digital_in) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-C-6 | Required OEM function "Cam sensor 2 + (G2+)" (trigger_in) is not connected to the new ECU. |
| warn | LOAD_UNKNOWN | FT450-A-A3 | FT450-A-A3 "Aux 1" drives OEM-B-6 Fuel pump relay (FPR) (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-B-7 A/C clutch relay (ACMG) (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-B-4 EFI main relay control (MREL) (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| info | NET_FAMILY | OEM-C-16 ↔ OEM-C-8 | OEM-C-16 "Crank sensor - (NE-)" [sensor_ground] is wired to OEM-C-8 "Crank sensor + (NE+)" [trigger_in]. Trigger return tied to sensor/trigger ground: correct for single-ended trigger inputs. |
| info | UNMAPPED | OEM | 28 optional OEM pins are not mapped: OEM-A-14 Neutral start switch (NSW); OEM-A-19 Vehicle speed (SPD); OEM-A-2 Starter signal (STA); OEM-A-20 Diagnostic test 2 (TE2); OEM-A-7 EGR temperature sensor; OEM-A-8 Knock/shield (KS); OEM-A-9 Diagnostic test 1 (TE1); OEM-B-19 Stop light switch (BK); OEM-B-20 A/T kickdown switch (KD); OEM-B-23 A/C request (AC); OEM-B-5 Check-engine lamp (W); OEM-B-8 Fuel pump control (FC); OEM-C-1 TPS idle switch (IDL); OEM-C-10 Igniter 2 feedback (IGF2); OEM-C-11 Knock sensor 2 (KNK2); OEM-C-12 Check connector VF2; OEM-C-2 Igniter 1 feedback (IGF1); OEM-C-3 Knock sensor 1 (KNK1); OEM-C-4 Check connector VF1; OEM-D-17 Cold start injector 1 (STJ1); OEM-D-20 O2 heater 1 (HT1); OEM-D-21 EGR solenoid; OEM-D-22 Fuel pressure-up VSV (PR); OEM-D-4 Cold start injector (STJ); OEM-D-5 ISC stepper coil 4 (ISC4); OEM-D-6 ISC stepper coil 3 (ISC3); OEM-D-7 ISC stepper coil 2 (ISC2); OEM-D-8 ISC stepper coil 1 (ISC1) |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-B-26 | Battery-constant (memory) feed of the stock ECU: the new ECU has no such input, so it is not needed. | mapping-proposal |
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-C 6: Cam sensor 2 + (G2+): no free cam_vr/cam_hall/frequency_in input on FuelTech FT450 - OEM-A 1: Ignition switch (IGSW): 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-B 26: Battery constant (BATT): FuelTech FT450 has no battery-constant input; not needed - OEM-C 3: Knock sensor 1 (KNK1): no free knock input on FuelTech FT450 - OEM-C 11: Knock sensor 2 (KNK2): no free knock input on FuelTech FT450 - OEM-A 8: Knock/shield (KS): no free knock input on FuelTech FT450 - OEM-D 20: O2 heater 1 (HT1): no free heater_low_side/low_side/relay_control/ls_hs/injector on FuelTech FT450 - OEM-D 17: Cold start injector 1 (STJ1): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-D 8: ISC stepper coil 1 (ISC1): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-D 7: ISC stepper coil 2 (ISC2): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-D 6: ISC stepper coil 3 (ISC3): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-D 5: ISC stepper coil 4 (ISC4): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-B 5: Check-engine lamp (W): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-B 8: Fuel pump control (FC): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-D 21: EGR solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-D 22: Fuel pressure-up VSV (PR): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-D 4: Cold start injector (STJ): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-A 7: EGR temperature sensor: no free thermistor/analog_0_5 on FuelTech FT450 - OEM-C 2: Igniter 1 feedback (IGF1): no free frequency_in/switch_in on FuelTech FT450 - OEM-C 10: Igniter 2 feedback (IGF2): no free frequency_in/switch_in on FuelTech FT450 - OEM-A 19: Vehicle speed (SPD): no free frequency_in/switch_in on FuelTech FT450 - OEM-A 9: Diagnostic test 1 (TE1): no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-A 20: Diagnostic test 2 (TE2): no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-A 14: Neutral start switch (NSW): no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-A 2: Starter signal (STA): no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-B 19: Stop light switch (BK): no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-B 20: A/T kickdown switch (KD): no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-B 23: A/C request (AC): no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-C 1: TPS idle switch (IDL): no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-C 4: Check connector VF1: no free analog_out on FuelTech FT450 - OEM-C 12: Check connector VF2: no free analog_out 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 | — | — | — |
| 2 | community_copy | Lextreme: Adaptronic install for 1UZ-FE (Lexus LS400/SC400) — 4-plug A/B/C/D ECU pin table (1992 LS400) | https://www.lextreme.com/installation-of-an-adaptronic-ecu-for-a-lexus-ls400-sc400-1uzfe-engine/ | — | — | — |