Lexus IS300 (XE10 / JCE10) 2001-05 2JZ-GE VVT-i → FuelTech FT450 (auto)
Lexus IS300 (XE10 / JCE10) 2001-05 2JZ-GE VVT-i — FuelTech — FT450
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 2026-10-20
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 | 2: read the Findings page before cutting any wire |
| Size of the job | 39 wires · 12 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-E2-13 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | OEM-E3-16 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | OEM-E3-7 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-E3-8 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-E3-9 | MAIN-R-COIL+ | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | NEW-BATT-1 | MAIN-R-IN | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | MAIN-R-COIL- | SP-GND-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | MAIN-R-OUT | FT450-A-A13 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-E6-17 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-E7-21 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-GND-1 | FT450-A-A7 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-E6-18 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-E6-19 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-E7-22 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | SP-0V-1 | FT450-A-A12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-E6-2 | FT450-A-A14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-E7-23 | FT450-A-A18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | SP-0V-1 | FT450-A-A18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-E7-10 | FT450-A-A17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-E7-11 | FT450-A-A8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-E7-12 | FT450-A-A9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-E7-13 | FT450-A-A10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-E6-5 | FT450-A-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-E6-6 | FT450-A-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-E7-1 | FT450-A-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-E7-2 | FT450-A-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-E7-3 | FT450-A-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-E7-4 | FT450-A-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-E7-17 | FT450-A-A3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-E7-18 | FT450-A-A4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-E7-19 | FT450-A-A5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-E7-20 | FT450-A-A6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-E6-15 | FT450-A-A20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-E6-23 | FT450-A-A21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-E6-16 | FT450-A-A22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-E6-24 | FT450-A-A23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-E6-14 | FT450-A-A24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-E6-10 | FT450-A-A25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-E6-22 | 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 | MAIN-R-COIL+ | FT450-A-A12 | open (OL) | +12 V supply must not touch sensor ground | |
| 2 | MAIN-R-COIL+ | FT450-A-A7 | open (OL) | +12 V supply must not touch power ground | |
| 3 | OEM-E2-13 | FT450-A-A12 | open (OL) | +12 V supply must not touch sensor ground | |
| 4 | OEM-E2-13 | FT450-A-A7 | open (OL) | +12 V supply must not touch power ground | |
| 5 | FT450-A-A12 | FT450-A-A13 | open (OL) | sensor ground must not touch +12 V supply | |
| 6 | FT450-A-A12 | FT450-A-A14 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 7 | FT450-A-A12 | NEW-BATT-1 | open (OL) | sensor ground must not touch +12 V supply | |
| 8 | FT450-A-A14 | FT450-A-A13 | open (OL) | 5 V sensor reference must not touch +12 V supply | |
| 9 | FT450-A-A14 | NEW-BATT-1 | open (OL) | 5 V sensor reference must not touch +12 V supply | |
| 10 | FT450-A-A7 | FT450-A-A13 | open (OL) | power ground must not touch +12 V supply | |
| 11 | FT450-A-A7 | FT450-A-A14 | open (OL) | power ground must not touch 5 V sensor reference | |
| 12 | FT450-A-A7 | NEW-BATT-1 | open (OL) | power ground must not touch +12 V supply | |
| 13 | MAIN-R-COIL+ | FT450-A-A14 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 14 | OEM-E2-13 | FT450-A-A14 | open (OL) | +12 V supply must not touch 5 V sensor reference |
If any reading doesn't match, stop and get help before powering up.
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
FT450-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A1 | Injector 1 (Bank A) | — | W23 | — | 0.5 | OEM-E6-5 | — | — | — |
| A1 | Injector 1 (Bank A) | — | W25 | — | 0.5 | OEM-E7-1 | — | — | — |
| A1 | Injector 1 (Bank A) | — | W27 | — | 0.5 | OEM-E7-3 | — | — | — |
| A10 | Ignition 3 | — | W22 | — | 0.5 | OEM-E7-13 | — | — | — |
| A11 | Ignition 4 | — | — | — | — | — | — | — | — |
| A12 | Signal ground | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| A13 | +12V switched | — | W8 | — | 0.85 | MAIN-R-OUT | — | — | — |
| A14 | +5V sensor supply | — | W16 | — | 0.5 | OEM-E6-2 | — | — | — |
| A15 | CAN A LOW | — | — | — | — | — | — | — | — |
| A16 | CAN A HIGH | — | — | — | — | — | — | — | — |
| A17 | Phase input (cam) | — | W19 | — | 0.5 | OEM-E7-10 | — | — | — |
| A18 | RPM reference (crank -) | — | W17 | — | 0.5 | OEM-E7-23 | — | — | — |
| A18 | RPM reference (crank -) | — | W18 | — | 0.5 | SP-0V-1 | — | — | — |
| A19 | RPM signal (crank +) | — | — | — | — | — | — | — | — |
| A2 | Injector 2 (Bank A) | — | W24 | — | 0.5 | OEM-E6-6 | — | — | — |
| A2 | Injector 2 (Bank A) | — | W26 | — | 0.5 | OEM-E7-2 | — | — | — |
| A2 | Injector 2 (Bank A) | — | W28 | — | 0.5 | OEM-E7-4 | — | — | — |
| A20 | White input 1 | — | W33 | — | 0.5 | OEM-E6-15 | — | — | — |
| A21 | White input 2 | — | W34 | — | 0.5 | OEM-E6-23 | — | — | — |
| A22 | White input 3 (TPS) | — | W35 | — | 0.5 | OEM-E6-16 | — | — | — |
| A23 | White input 4 (oil pressure) | — | W36 | — | 0.5 | OEM-E6-24 | — | — | — |
| A24 | White input 5 (water temp) | — | W37 | — | 0.5 | OEM-E6-14 | — | — | — |
| A25 | White input 6 (fuel pressure) | — | W38 | — | 0.5 | OEM-E6-10 | — | — | — |
| A26 | White input 7 (air temp) | — | W39 | — | 0.5 | OEM-E6-22 | — | — | — |
| A3 | Aux 1 | — | W29 | — | 0.5 | OEM-E7-17 | — | — | — |
| A4 | Aux 2 | — | W30 | — | 0.5 | OEM-E7-18 | — | — | — |
| A5 | Aux 3 | — | W31 | — | 0.5 | OEM-E7-19 | — | — | — |
| A6 | Aux 4 (fuel pump / relays) | — | W32 | — | 0.5 | OEM-E7-20 | — | — | — |
| A7 | Power ground | — | W11 | — | 0.85 | SP-GND-1 | — | — | — |
| A8 | Ignition 1 | — | W20 | — | 0.5 | OEM-E7-11 | — | — | — |
| A9 | Ignition 2 | — | W21 | — | 0.5 | OEM-E7-12 | — | — | — |
MAIN-R
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| COIL+ | Relay coil positive (ignition-switched +12V) | — | W5 | — | 0.5 | OEM-E3-9 | — | — | — |
| COIL- | Relay coil negative (ECU low-side driver) | — | W7 | — | 0.5 | SP-GND-1 | — | — | — |
| IN | Relay contact input (battery + via main fuse) | — | W6 | — | 0.85 | NEW-BATT-1 | — | — | — |
| OUT | Relay contact output (switched +12V bus) | — | W8 | — | 0.85 | FT450-A-A13 | — | — | — |
NEW-BATT
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W6 | — | 0.85 | MAIN-R-IN | — | — | — |
OEM-E2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 13 | ETCS power (TBP, throttle bypass) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 24 | O2 right rear (OXR2) | — | — | — | — | — | — | — | — |
| 25 | O2 heater right rear (HTR2) | — | — | — | — | — | — | — | — |
| 26 | O2 heater left rear (HTL2) | — | — | — | — | — | — | — | — |
OEM-E3
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Battery constant (BATT) | — | — | — | — | — | — | — | — |
| 10 | EFI main relay control (MREL) | — | — | — | — | — | — | — | — |
| 11 | Serial diagnostic (SIL) | — | — | — | — | — | — | — | — |
| 16 | EFI main relay (+B) | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 4 | Fuel pump relay (FPR) | — | — | — | — | — | — | — | — |
| 5 | Fuel pump control (FC) | — | — | — | — | — | — | — | — |
| 6 | Check-engine lamp (W) | — | — | — | — | — | — | — | — |
| 7 | ETCS main relay (+BM) | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 8 | EFI main relay (+B2) | — | W4 | — | 0.85 | SP-14V-1 | — | — | — |
| 9 | Ignition switch (IGSW) | — | W5 | — | 0.5 | MAIN-R-COIL+ | — | — | — |
OEM-E4
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 13 | A/C clutch relay (ACMG) | — | — | — | — | — | — | — | — |
| 18 | EVAP vapor pressure (PTNK) | — | — | — | — | — | — | — | — |
| 2 | Starter signal (STA) | — | — | — | — | — | — | — | — |
| 5 | Diagnostic/timing check (TC) | — | — | — | — | — | — | — | — |
| 6 | Stop light switch (STP) | — | — | — | — | — | — | — | — |
| 8 | O2 left rear (OXL2) | — | — | — | — | — | — | — | — |
OEM-E5
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 11 | Vehicle speed sensor (SP2-) | — | — | — | — | — | — | — | — |
| 12 | Canister close valve (CCV) | — | — | — | — | — | — | — | — |
| 5 | Vehicle speed sensor (SP2+) | — | — | — | — | — | — | — | — |
OEM-E6
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 10 | Mass air flow (VG) | — | W38 | — | 0.5 | FT450-A-A25 | — | — | — |
| 11 | O2 right front (OXR1) | — | — | — | — | — | — | — | — |
| 12 | O2 left front (OXL1) | — | — | — | — | — | — | — | — |
| 14 | Coolant temperature (THW) | — | W37 | — | 0.5 | FT450-A-A24 | — | — | — |
| 15 | Accelerator pedal 1 (VPA) | — | W33 | — | 0.5 | FT450-A-A20 | — | — | — |
| 16 | Accelerator pedal 2 (VPA2) | — | W35 | — | 0.5 | FT450-A-A22 | — | — | — |
| 17 | Power ground (E1) | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| 18 | Sensor ground (E2) | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 19 | MAF ground (EVG) | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 2 | Sensor supply +5V (VC) | — | W16 | — | 0.5 | FT450-A-A14 | — | — | — |
| 22 | Intake air temperature (THA) | — | W39 | — | 0.5 | FT450-A-A26 | — | — | — |
| 23 | Throttle position 1 (VTA) | — | W34 | — | 0.5 | FT450-A-A21 | — | — | — |
| 24 | Throttle position 2 (VTA2) | — | W36 | — | 0.5 | FT450-A-A23 | — | — | — |
| 3 | O2 heater right front (HTR) | — | — | — | — | — | — | — | — |
| 4 | O2 heater left front (HTL) | — | — | — | — | — | — | — | — |
| 5 | Injector 1 (#10) | — | W23 | — | 0.5 | FT450-A-A1 | — | — | — |
| 6 | Injector 2 (#20) | — | W24 | — | 0.5 | FT450-A-A2 | — | — | — |
| 7 | EVAP purge VSV (PRG) | — | — | — | — | — | — | — | — |
OEM-E7
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injector 3 (#30) | — | W25 | — | 0.5 | FT450-A-A1 | — | — | — |
| 10 | Cam position (G2) | — | W19 | — | 0.5 | FT450-A-A17 | — | — | — |
| 11 | Ignition 1 (IGT) | — | W20 | — | 0.5 | FT450-A-A8 | — | — | — |
| 12 | Ignition 2 (IGT2) | — | W21 | — | 0.5 | FT450-A-A9 | — | — | — |
| 13 | Ignition 3 (IGT3) | — | W22 | — | 0.5 | FT450-A-A10 | — | — | — |
| 17 | VVT-i OCV - (OCV-) | — | W29 | — | 0.5 | FT450-A-A3 | — | — | — |
| 18 | VVT-i OCV + (OCV+) | — | W30 | — | 0.5 | FT450-A-A4 | — | — | — |
| 19 | ETCS throttle clutch - (CL-) | — | W31 | — | 0.5 | FT450-A-A5 | — | — | — |
| 2 | Injector 4 (#40) | — | W26 | — | 0.5 | FT450-A-A2 | — | — | — |
| 20 | ETCS throttle clutch + (CL+) | — | W32 | — | 0.5 | FT450-A-A6 | — | — | — |
| 21 | Power ground (E01) | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
| 22 | Crank position return (NE-) | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 23 | Crank position (NE) | — | W17 | — | 0.5 | FT450-A-A18 | — | — | — |
| 25 | Igniter feedback (IGF) | — | — | — | — | — | — | — | — |
| 27 | Knock sensor 2 (KNK2) | — | — | — | — | — | — | — | — |
| 28 | Knock sensor 1 (KNK1) | — | — | — | — | — | — | — | — |
| 3 | Injector 5 (#50) | — | W27 | — | 0.5 | FT450-A-A1 | — | — | — |
| 4 | Injector 6 (#60) | — | W28 | — | 0.5 | FT450-A-A2 | — | — | — |
| 5 | ACIS intake VSV | — | — | — | — | — | — | — | — |
| 7 | ETCS throttle motor − (M−) | — | — | — | — | — | — | — | — |
| 8 | ETCS throttle motor + (M+) | — | — | — | — | — | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W12 | — | 0.5 | OEM-E6-18 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | OEM-E6-19 | — | — | — |
| 1 | — | — | W14 | — | 0.5 | OEM-E7-22 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | FT450-A-A12 | — | — | — |
| 1 | — | — | W18 | — | 0.5 | FT450-A-A18 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-E2-13 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | OEM-E3-16 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | OEM-E3-7 | — | — | — |
| 1 | — | — | W4 | — | 0.85 | OEM-E3-8 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W7 | — | 0.5 | MAIN-R-COIL- | — | — | — |
| 1 | — | — | W9 | — | 0.85 | OEM-E6-17 | — | — | — |
| 1 | — | — | W10 | — | 0.85 | OEM-E7-21 | — | — | — |
| 1 | — | — | W11 | — | 0.85 | FT450-A-A7 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-E2-13 | ETCS power (TBP, throttle bypass) | power_in | — | — | — | single_source | |
| OEM-E2-24 | O2 right rear (OXR2) | lambda_nb_in | — | — | — | single_source | |
| OEM-E2-25 | O2 heater right rear (HTR2) | low_side_out | — | — | — | single_source | |
| OEM-E2-26 | O2 heater left rear (HTL2) | low_side_out | — | — | — | single_source | |
| OEM-E3-1 | Battery constant (BATT) | power_in | — | — | — | single_source | |
| OEM-E3-10 | EFI main relay control (MREL) | low_side_out | — | — | — | single_source | |
| OEM-E3-11 | Serial diagnostic (SIL) | serial | — | — | — | single_source | |
| OEM-E3-16 | EFI main relay (+B) | power_in | — | — | — | single_source | |
| OEM-E3-4 | Fuel pump relay (FPR) | low_side_out | — | — | — | single_source | |
| OEM-E3-5 | Fuel pump control (FC) | low_side_out | — | — | — | single_source | |
| OEM-E3-6 | Check-engine lamp (W) | low_side_out | — | — | — | single_source | |
| OEM-E3-7 | ETCS main relay (+BM) | power_in | — | — | — | single_source | |
| OEM-E3-8 | EFI main relay (+B2) | power_in | — | — | — | single_source | |
| OEM-E3-9 | Ignition switch (IGSW) | digital_in | MAIN-R-COIL+ | Relay coil positive (ignition-switched +12V) | power_in | single_source | |
| OEM-E4-13 | A/C clutch relay (ACMG) | low_side_out | — | — | — | single_source | |
| OEM-E4-18 | EVAP vapor pressure (PTNK) | analog_in | — | — | — | single_source | |
| OEM-E4-2 | Starter signal (STA) | digital_in | — | — | — | single_source | |
| OEM-E4-5 | Diagnostic/timing check (TC) | digital_in | — | — | — | single_source | |
| OEM-E4-6 | Stop light switch (STP) | digital_in | — | — | — | single_source | |
| OEM-E4-8 | O2 left rear (OXL2) | lambda_nb_in | — | — | — | single_source | |
| OEM-E5-11 | Vehicle speed sensor (SP2-) | digital_in | — | — | — | single_source | |
| OEM-E5-12 | Canister close valve (CCV) | low_side_out | — | — | — | single_source | |
| OEM-E5-5 | Vehicle speed sensor (SP2+) | digital_in | — | — | — | single_source | |
| OEM-E6-10 | Mass air flow (VG) | analog_in | FT450-A-A25 | White input 6 (fuel pressure) | analog_in | single_source | |
| OEM-E6-11 | O2 right front (OXR1) | lambda_nb_in | — | — | — | single_source | |
| OEM-E6-12 | O2 left front (OXL1) | lambda_nb_in | — | — | — | single_source | |
| OEM-E6-14 | Coolant temperature (THW) | temp_in | FT450-A-A24 | White input 5 (water temp) | temp_in | single_source | |
| OEM-E6-15 | Accelerator pedal 1 (VPA) | analog_in | FT450-A-A20 | White input 1 | analog_in | single_source | |
| OEM-E6-16 | Accelerator pedal 2 (VPA2) | analog_in | FT450-A-A22 | White input 3 (TPS) | analog_in | single_source | |
| OEM-E6-17 | Power ground (E1) | ground | FT450-A-A7 + MAIN-R-COIL- | Power ground + Relay coil negative (ECU low-side driver) | ground + load | single_source | |
| OEM-E6-18 | Sensor ground (E2) | sensor_ground | FT450-A-A12 + FT450-A-A18 | Signal ground + RPM reference (crank -) | sensor_ground + trigger_in | single_source | |
| OEM-E6-19 | MAF ground (EVG) | sensor_ground | FT450-A-A12 + FT450-A-A18 | Signal ground + RPM reference (crank -) | sensor_ground + trigger_in | single_source | |
| OEM-E6-2 | Sensor supply +5V (VC) | vref | FT450-A-A14 | +5V sensor supply | vref | single_source | |
| OEM-E6-22 | Intake air temperature (THA) | temp_in | FT450-A-A26 | White input 7 (air temp) | temp_in | single_source | |
| OEM-E6-23 | Throttle position 1 (VTA) | analog_in | FT450-A-A21 | White input 2 | analog_in | single_source | |
| OEM-E6-24 | Throttle position 2 (VTA2) | analog_in | FT450-A-A23 | White input 4 (oil pressure) | analog_in | single_source | |
| OEM-E6-3 | O2 heater right front (HTR) | low_side_out | — | — | — | single_source | |
| OEM-E6-4 | O2 heater left front (HTL) | low_side_out | — | — | — | single_source | |
| OEM-E6-5 | Injector 1 (#10) | injector_out | FT450-A-A1 | Injector 1 (Bank A) | injector_out | single_source | |
| OEM-E6-6 | Injector 2 (#20) | injector_out | FT450-A-A2 | Injector 2 (Bank A) | injector_out | single_source | |
| OEM-E6-7 | EVAP purge VSV (PRG) | low_side_out | — | — | — | single_source | |
| OEM-E7-1 | Injector 3 (#30) | injector_out | FT450-A-A1 | Injector 1 (Bank A) | injector_out | single_source | |
| OEM-E7-10 | Cam position (G2) | trigger_in | FT450-A-A17 | Phase input (cam) | trigger_in | single_source | |
| OEM-E7-11 | Ignition 1 (IGT) | ignition_out | FT450-A-A8 | Ignition 1 | ignition_out | single_source | |
| OEM-E7-12 | Ignition 2 (IGT2) | ignition_out | FT450-A-A9 | Ignition 2 | ignition_out | single_source | |
| OEM-E7-13 | Ignition 3 (IGT3) | ignition_out | FT450-A-A10 | Ignition 3 | ignition_out | single_source | |
| OEM-E7-17 | VVT-i OCV - (OCV-) | low_side_out | FT450-A-A3 | Aux 1 | low_side_out | single_source | |
| OEM-E7-18 | VVT-i OCV + (OCV+) | low_side_out | FT450-A-A4 | Aux 2 | low_side_out | single_source | |
| OEM-E7-19 | ETCS throttle clutch - (CL-) | low_side_out | FT450-A-A5 | Aux 3 | low_side_out | single_source | |
| OEM-E7-2 | Injector 4 (#40) | injector_out | FT450-A-A2 | Injector 2 (Bank A) | injector_out | single_source | |
| OEM-E7-20 | ETCS throttle clutch + (CL+) | low_side_out | FT450-A-A6 | Aux 4 (fuel pump / relays) | low_side_out | single_source | |
| OEM-E7-21 | Power ground (E01) | ground | FT450-A-A7 + MAIN-R-COIL- | Power ground + Relay coil negative (ECU low-side driver) | ground + load | single_source | |
| OEM-E7-22 | Crank position return (NE-) | sensor_ground | FT450-A-A12 + FT450-A-A18 | Signal ground + RPM reference (crank -) | sensor_ground + trigger_in | single_source | |
| OEM-E7-23 | Crank position (NE) | trigger_in | FT450-A-A12 + FT450-A-A18 | Signal ground + RPM reference (crank -) | sensor_ground + trigger_in | single_source | |
| OEM-E7-25 | Igniter feedback (IGF) | digital_in | — | — | — | single_source | |
| OEM-E7-27 | Knock sensor 2 (KNK2) | knock_in | — | — | — | single_source | |
| OEM-E7-28 | Knock sensor 1 (KNK1) | knock_in | — | — | — | single_source | |
| OEM-E7-3 | Injector 5 (#50) | injector_out | FT450-A-A1 | Injector 1 (Bank A) | injector_out | single_source | |
| OEM-E7-4 | Injector 6 (#60) | injector_out | FT450-A-A2 | Injector 2 (Bank A) | injector_out | single_source | |
| OEM-E7-5 | ACIS intake VSV | low_side_out | — | — | — | single_source | |
| OEM-E7-7 | ETCS throttle motor − (M−) | hbridge_out | — | — | — | single_source | |
| OEM-E7-8 | ETCS throttle motor + (M+) | hbridge_out | — | — | — | single_source |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-E2-13 | SP-14V-1 | 0.85 | no route | ETCS power (TBP, throttle bypass) | — | |
| W2 | OEM-E3-16 | SP-14V-1 | 0.85 | no route | EFI main relay (+B) | — | |
| W3 | OEM-E3-7 | SP-14V-1 | 0.85 | no route | ETCS main relay (+BM) | — | |
| W4 | OEM-E3-8 | SP-14V-1 | 0.85 | no route | EFI main relay (+B2) | — | |
| W5 | OEM-E3-9 | MAIN-R-COIL+ | 0.5 | no route | Ignition switch (IGSW) | — | |
| W6 | NEW-BATT-1 | MAIN-R-IN | 0.85 | no route | Relay contact input (battery + via main fuse) | — | |
| W7 | MAIN-R-COIL- | SP-GND-1 | 0.5 | no route | Relay coil negative (ECU low-side driver) | — | |
| W8 | MAIN-R-OUT | FT450-A-A13 | 0.85 | no route | Relay contact output (switched +12V bus) | — | |
| W9 | OEM-E6-17 | SP-GND-1 | 0.85 | no route | Power ground (E1) | — | |
| W10 | OEM-E7-21 | SP-GND-1 | 0.85 | no route | Power ground (E01) | — | |
| W11 | SP-GND-1 | FT450-A-A7 | 0.85 | no route | Power ground | — | |
| W12 | OEM-E6-18 | SP-0V-1 | 0.5 | no route | Sensor ground (E2) | — | |
| W13 | OEM-E6-19 | SP-0V-1 | 0.5 | no route | MAF ground (EVG) | — | |
| W14 | OEM-E7-22 | SP-0V-1 | 0.5 | no route | Crank position return (NE-) | — | |
| W15 | SP-0V-1 | FT450-A-A12 | 0.5 | no route | Signal ground | — | |
| W16 | OEM-E6-2 | FT450-A-A14 | 0.5 | no route | Sensor supply +5V (VC) | — | |
| W17 | OEM-E7-23 | FT450-A-A18 | 0.5 | no route | Crank position (NE) | — | |
| W18 | SP-0V-1 | FT450-A-A18 | 0.5 | no route | RPM reference (crank -) | — | |
| W19 | OEM-E7-10 | FT450-A-A17 | 0.5 | no route | Cam position (G2) | — | |
| W20 | OEM-E7-11 | FT450-A-A8 | 0.5 | no route | Ignition 1 (IGT) | — | |
| W21 | OEM-E7-12 | FT450-A-A9 | 0.5 | no route | Ignition 2 (IGT2) | — | |
| W22 | OEM-E7-13 | FT450-A-A10 | 0.5 | no route | Ignition 3 (IGT3) | — | |
| W23 | OEM-E6-5 | FT450-A-A1 | 0.5 | no route | Injector 1 (#10) | — | |
| W24 | OEM-E6-6 | FT450-A-A2 | 0.5 | no route | Injector 2 (#20) | — | |
| W25 | OEM-E7-1 | FT450-A-A1 | 0.5 | no route | Injector 3 (#30) | — | |
| W26 | OEM-E7-2 | FT450-A-A2 | 0.5 | no route | Injector 4 (#40) | — | |
| W27 | OEM-E7-3 | FT450-A-A1 | 0.5 | no route | Injector 5 (#50) | — | |
| W28 | OEM-E7-4 | FT450-A-A2 | 0.5 | no route | Injector 6 (#60) | — | |
| W29 | OEM-E7-17 | FT450-A-A3 | 0.5 | no route | VVT-i OCV - (OCV-) | — | |
| W30 | OEM-E7-18 | FT450-A-A4 | 0.5 | no route | VVT-i OCV + (OCV+) | — | |
| W31 | OEM-E7-19 | FT450-A-A5 | 0.5 | no route | ETCS throttle clutch - (CL-) | — | |
| W32 | OEM-E7-20 | FT450-A-A6 | 0.5 | no route | ETCS throttle clutch + (CL+) | — | |
| W33 | OEM-E6-15 | FT450-A-A20 | 0.5 | no route | Accelerator pedal 1 (VPA) | — | |
| W34 | OEM-E6-23 | FT450-A-A21 | 0.5 | no route | Throttle position 1 (VTA) | — | |
| W35 | OEM-E6-16 | FT450-A-A22 | 0.5 | no route | Accelerator pedal 2 (VPA2) | — | |
| W36 | OEM-E6-24 | FT450-A-A23 | 0.5 | no route | Throttle position 2 (VTA2) | — | |
| W37 | OEM-E6-14 | FT450-A-A24 | 0.5 | no route | Coolant temperature (THW) | — | |
| W38 | OEM-E6-10 | FT450-A-A25 | 0.5 | no route | Mass air flow (VG) | — | |
| W39 | OEM-E6-22 | 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 (5)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | REQUIRED_UNMAPPED | OEM-E7-7 | Required OEM function "ETCS throttle motor − (M−)" (hbridge_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-E7-8 | Required OEM function "ETCS throttle motor + (M+)" (hbridge_out) is not connected to the new ECU. |
| info | NET_FAMILY | OEM-E3-9 ↔ MAIN-R-COIL+ | OEM-E3-9 "Ignition switch (IGSW)" [digital_in] is wired to MAIN-R-COIL+ "Relay coil positive (ignition-switched +12V)" [power_in]. Switched supply used as the ignition-on sense. |
| info | NET_FAMILY | OEM-E6-18 ↔ FT450-A-A18 | OEM-E6-18 "Sensor ground (E2)" [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 | 27 optional OEM pins are not mapped: OEM-E2-13 ETCS power (TBP, throttle bypass); OEM-E2-24 O2 right rear (OXR2); OEM-E2-25 O2 heater right rear (HTR2); OEM-E2-26 O2 heater left rear (HTL2); OEM-E3-10 EFI main relay control (MREL); OEM-E3-11 Serial diagnostic (SIL); OEM-E3-4 Fuel pump relay (FPR); OEM-E3-5 Fuel pump control (FC); OEM-E3-6 Check-engine lamp (W); OEM-E4-13 A/C clutch relay (ACMG); OEM-E4-18 EVAP vapor pressure (PTNK); OEM-E4-2 Starter signal (STA); OEM-E4-5 Diagnostic/timing check (TC); OEM-E4-6 Stop light switch (STP); OEM-E4-8 O2 left rear (OXL2); OEM-E5-11 Vehicle speed sensor (SP2-); OEM-E5-12 Canister close valve (CCV); OEM-E5-5 Vehicle speed sensor (SP2+); OEM-E6-11 O2 right front (OXR1); OEM-E6-12 O2 left front (OXL1); OEM-E6-3 O2 heater right front (HTR); OEM-E6-4 O2 heater left front (HTL); OEM-E6-7 EVAP purge VSV (PRG); OEM-E7-25 Igniter feedback (IGF); OEM-E7-27 Knock sensor 2 (KNK2); OEM-E7-28 Knock sensor 1 (KNK1); OEM-E7-5 ACIS intake VSV |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-E3-1 | 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 6 cylinders: wasted spark (pair coils per firing order) Auto-mapped by auto_map() from the library pin data on 2026-10-20. Review every wire against both manuals before building. Open items: - OEM-E7 7: ETCS 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-E7 8: ETCS 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) Not wired: - OEM-E3 1: Battery constant (BATT): FuelTech FT450 has no battery-constant memory input; not needed - OEM-E7 28: Knock sensor 1 (KNK1): no free knock input on FuelTech FT450 - OEM-E7 27: Knock sensor 2 (KNK2): no free knock input on FuelTech FT450 - OEM-E3 10: EFI main relay control (MREL): no free relay_control/low_side/heater_low_side/ls_hs/injector rated ≥ 0.2 A on FuelTech FT450 - OEM-E3 4: Fuel pump relay (FPR): no free relay_control/low_side/heater_low_side/ls_hs/injector rated ≥ 0.2 A on FuelTech FT450 - OEM-E4 13: A/C clutch relay (ACMG): no free relay_control/low_side/heater_low_side/ls_hs/injector rated ≥ 0.2 A on FuelTech FT450 - OEM-E2 25: O2 heater right rear (HTR2): no free heater_low_side/low_side/relay_control/ls_hs/injector on FuelTech FT450 - OEM-E2 26: O2 heater left rear (HTL2): no free heater_low_side/low_side/relay_control/ls_hs/injector on FuelTech FT450 - OEM-E6 3: O2 heater right front (HTR): no free heater_low_side/low_side/relay_control/ls_hs/injector on FuelTech FT450 - OEM-E6 4: O2 heater left front (HTL): no free heater_low_side/low_side/relay_control/ls_hs/injector on FuelTech FT450 - OEM-E3 5: Fuel pump control (FC): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-E3 6: Check-engine lamp (W): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-E5 12: Canister close valve (CCV): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-E6 7: EVAP purge VSV (PRG): no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-E7 5: ACIS intake VSV: no free low_side/relay_control/heater_low_side/ls_hs/injector on FuelTech FT450 - OEM-E2 24: O2 right rear (OXR2): no free o2_narrowband/analog_0_5 on FuelTech FT450 - OEM-E4 8: O2 left rear (OXL2): no free o2_narrowband/analog_0_5 on FuelTech FT450 - OEM-E6 11: O2 right front (OXR1): no free o2_narrowband/analog_0_5 on FuelTech FT450 - OEM-E6 12: O2 left front (OXL1): no free o2_narrowband/analog_0_5 on FuelTech FT450 - OEM-E4 18: EVAP vapor pressure (PTNK): no free analog_0_5 on FuelTech FT450 - OEM-E5 11: Vehicle speed sensor (SP2-): no free frequency_in/switch_in on FuelTech FT450 - OEM-E5 5: Vehicle speed sensor (SP2+): no free frequency_in/switch_in on FuelTech FT450 - OEM-E7 25: Igniter feedback (IGF): no free frequency_in/switch_in on FuelTech FT450 - OEM-E4 2: Starter signal (STA): no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-E4 5: Diagnostic/timing check (TC): no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-E4 6: Stop light switch (STP): no free switch_in/frequency_in/analog_0_5 on FuelTech FT450 - OEM-E3 11: Serial diagnostic (SIL): no free k_line on FuelTech FT450
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | Emtron SL4/SL6/SL8 pinout pages | https://docs.emtronaustralia.com.au/engine-management/wiring/index.html | archive | 2026-10-05 | e52b3da9996a |
| 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 | service_manual | Toyota FSM RM779U (2001 Lexus IS300) — DIAGNOSTICS 'TERMINALS OF ECM' (DI-20/21) | http://www.2jzgarage.com/wp-content/uploads/2013/04/2001_IS300_ECU_Pinouts.pdf | — | — | — |
| 3 | forum | rusEFI Mazda Miata 2002 engine wiring | https://github.com/rusefi/rusefi/wiki/Mazda-Miata-2002 | archive | 2026-10-05 | cc3cae670408 |