Toyota Supra A70 1986-92 (7M-GTE) → FuelTech FT450 (auto)
Toyota Supra A70 1986-92 (7M-GTE) — 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 | 11 wires · 6 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-26 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | SP-GND-1 | FT450-A-A7 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | OEM-B-9 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | SP-0V-1 | FT450-A-A12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-A-12 | FT450-A-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-A-11 | FT450-A-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-A-25 | FT450-A-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | OEM-B-11 | FT450-A-A20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-B-4 | FT450-A-A24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-B-6 | FT450-A-A21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-B-3 | 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 |
|---|---|---|---|---|---|
| No supply/ground nets found to cross-check. | |||||
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) | — | W5 | — | 0.5 | OEM-A-12 | — | — | — |
| A1 | Injector 1 (Bank A) | — | W7 | — | 0.5 | OEM-A-25 | — | — | — |
| A10 | Ignition 3 | — | — | — | — | — | — | — | — |
| A11 | Ignition 4 | — | — | — | — | — | — | — | — |
| A12 | Signal ground | — | W4 | — | 0.5 | SP-0V-1 | — | — | — |
| A13 | +12V switched | — | — | — | — | — | — | — | — |
| A14 | +5V sensor supply | — | — | — | — | — | — | — | — |
| A15 | CAN A LOW | — | — | — | — | — | — | — | — |
| A16 | CAN A HIGH | — | — | — | — | — | — | — | — |
| A17 | Phase input (cam) | — | — | — | — | — | — | — | — |
| A18 | RPM reference (crank -) | — | — | — | — | — | — | — | — |
| A19 | RPM signal (crank +) | — | — | — | — | — | — | — | — |
| A2 | Injector 2 (Bank A) | — | W6 | — | 0.5 | OEM-A-11 | — | — | — |
| A20 | White input 1 | — | W8 | — | 0.5 | OEM-B-11 | — | — | — |
| A21 | White input 2 | — | W10 | — | 0.5 | OEM-B-6 | — | — | — |
| A22 | White input 3 (TPS) | — | — | — | — | — | — | — | — |
| A23 | White input 4 (oil pressure) | — | — | — | — | — | — | — | — |
| A24 | White input 5 (water temp) | — | W9 | — | 0.5 | OEM-B-4 | — | — | — |
| A25 | White input 6 (fuel pressure) | — | — | — | — | — | — | — | — |
| A26 | White input 7 (air temp) | — | W11 | — | 0.5 | OEM-B-3 | — | — | — |
| A3 | Aux 1 | — | — | — | — | — | — | — | — |
| A4 | Aux 2 | — | — | — | — | — | — | — | — |
| A5 | Aux 3 | — | — | — | — | — | — | — | — |
| A6 | Aux 4 (fuel pump / relays) | — | — | — | — | — | — | — | — |
| A7 | Power ground | — | W2 | — | 0.85 | SP-GND-1 | — | — | — |
| A8 | Ignition 1 | — | — | — | — | — | — | — | — |
| A9 | Ignition 2 | — | — | — | — | — | — | — | — |
OEM-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 11 | Injectors 2 & 6 (No.20) | — | W6 | — | 0.5 | FT450-A-A2 | — | — | — |
| 12 | Injectors 1 & 4 (No.10) | — | W5 | — | 0.5 | FT450-A-A1 | — | — | — |
| 25 | Injectors 3 & 5 (No.30) | — | W7 | — | 0.5 | FT450-A-A1 | — | — | — |
| 26 | Power ground (E01/E02) | — | W1 | — | 0.85 | SP-GND-1 | — | — | — |
OEM-B
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 11 | Throttle position sensor (VTA) | — | W8 | — | 0.5 | FT450-A-A20 | — | — | — |
| 2 | Karman-vortex AFM signal (KS) | — | — | — | — | — | — | — | — |
| 3 | Intake air temp (THA) | — | W11 | — | 0.5 | FT450-A-A26 | — | — | — |
| 4 | Coolant temp (THW) | — | W9 | — | 0.5 | FT450-A-A24 | — | — | — |
| 6 | Primary O2 sensor (OX1) | — | W10 | — | 0.5 | FT450-A-A21 | — | — | — |
| 9 | Sensor ground (E2) | — | W3 | — | 0.5 | SP-0V-1 | — | — | — |
OEM-D
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 9 | Vehicle speed sensor (SPD) | — | — | — | — | — | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W3 | — | 0.5 | OEM-B-9 | — | — | — |
| 1 | — | — | W4 | — | 0.5 | FT450-A-A12 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-A-26 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | FT450-A-A7 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-A-11 | Injectors 2 & 6 (No.20) | injector_out | FT450-A-A2 | Injector 2 (Bank A) | injector_out | corroborated | |
| OEM-A-12 | Injectors 1 & 4 (No.10) | injector_out | FT450-A-A1 | Injector 1 (Bank A) | injector_out | corroborated | |
| OEM-A-25 | Injectors 3 & 5 (No.30) | injector_out | FT450-A-A1 | Injector 1 (Bank A) | injector_out | corroborated | |
| OEM-A-26 | Power ground (E01/E02) | ground | FT450-A-A7 | Power ground | ground | corroborated | |
| OEM-B-11 | Throttle position sensor (VTA) | analog_in | FT450-A-A20 | White input 1 | analog_in | corroborated | |
| OEM-B-2 | Karman-vortex AFM signal (KS) | digital_in | — | — | — | corroborated | |
| OEM-B-3 | Intake air temp (THA) | temp_in | FT450-A-A26 | White input 7 (air temp) | temp_in | corroborated | |
| OEM-B-4 | Coolant temp (THW) | temp_in | FT450-A-A24 | White input 5 (water temp) | temp_in | corroborated | |
| OEM-B-6 | Primary O2 sensor (OX1) | lambda_nb_in | FT450-A-A21 | White input 2 | analog_in | corroborated | |
| OEM-B-9 | Sensor ground (E2) | sensor_ground | FT450-A-A12 | Signal ground | sensor_ground | corroborated | |
| OEM-D-9 | Vehicle speed sensor (SPD) | digital_in | — | — | — | corroborated |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-A-26 | SP-GND-1 | 0.85 | no route | Power ground (E01/E02) | — | |
| W2 | SP-GND-1 | FT450-A-A7 | 0.85 | no route | Power ground | — | |
| W3 | OEM-B-9 | SP-0V-1 | 0.5 | no route | Sensor ground (E2) | — | |
| W4 | SP-0V-1 | FT450-A-A12 | 0.5 | no route | Signal ground | — | |
| W5 | OEM-A-12 | FT450-A-A1 | 0.5 | no route | Injectors 1 & 4 (No.10) | — | |
| W6 | OEM-A-11 | FT450-A-A2 | 0.5 | no route | Injectors 2 & 6 (No.20) | — | |
| W7 | OEM-A-25 | FT450-A-A1 | 0.5 | no route | Injectors 3 & 5 (No.30) | — | |
| W8 | OEM-B-11 | FT450-A-A20 | 0.5 | no route | Throttle position sensor (VTA) | — | |
| W9 | OEM-B-4 | FT450-A-A24 | 0.5 | no route | Coolant temp (THW) | — | |
| W10 | OEM-B-6 | FT450-A-A21 | 0.5 | no route | Primary O2 sensor (OX1) | — | |
| W11 | OEM-B-3 | 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 (5)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | INJECTOR_BALLAST | FT450 | The 7M-GTE injectors (7M-GTE fuel injector) are low-impedance, but FT450 drives saturated (high-Z) injectors only. Add a ballast resistor pack in series with each injector, or use an ECU with low-Z / peak-and-hold injector drivers. |
| error | NET_MERGED | FT450-A-A1 + OEM-A-12 + OEM-A-25 | 2 different OEM functions share one net: OEM-A-12 Injectors 1 & 4 (No.10); OEM-A-25 Injectors 3 & 5 (No.30) |
| error | PHYS_REQUIRED_OPEN | FT450-A-A13 | FT450-A-A13 "+12V switched" is required but not wired. |
| error | REQUIRED_UNMAPPED | OEM-B-2 | Required OEM function "Karman-vortex AFM signal (KS)" (digital_in) is not connected to the new ECU. |
| info | UNMAPPED | OEM | 1 optional OEM pins are not mapped: OEM-D-9 Vehicle speed sensor (SPD) |
Accepted (0)
| Code | Subject | Reason | By |
|---|
Notes
Auto-mapped by auto_map() from the library pin data on 2026-10-11. Review every wire against both manuals before building. Open items: - Main-relay feed: no ecu_main_power pin on the stock or the new ECU - OEM-B 2: Karman-vortex AFM signal (KS): no free frequency_in/switch_in on FuelTech FT450 - FT450-A A13: +12V switched: required by FuelTech FT450 but no stock pin feeds it; wire by hand - Fuel-pump control: FuelTech FT450 needs to drive the fuel pump, but the stock ECU has no fuel-pump output (an airflow-meter contact or a separate module runs it). Add a fuel-pump relay on a spare low-side output — see the install notes for this car. Not wired: - OEM-D 9: Vehicle speed sensor (SPD): no free frequency_in/switch_in 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 7M-GTE EFI manual — "Terminals of ECU" (complete terminal list, no pin numbers) | http://shoarmateam.nl/upload/Toyota-Other/Cressida/MX83/efi%20system%20+%20WIRING/toyota-7m-manual-efi-fi%5b1%5d.pdf | — | — | — |
| 2 | forum | AllPinouts: 1989–1992 Toyota Supra ECU | https://allpinouts.org/pinouts/connectors/car/1989-1992-toyota-supra-ecu/ | — | — | — |