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 · 2026-10-23
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 | 1: read the Findings page before cutting any wire |
| Size of the job | 22 wires · 11 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-D-12 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | OEM-D-13 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | NEW-KEYON-1 | MAIN-R-COIL+ | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | NEW-BATT-1 | MAIN-R-IN | 5.0 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | MAIN-R-COIL- | SP-GND-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | MAIN-R-OUT | FT450-A-A13 | 5.0 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-A-26 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | FT450-A-A7 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-B-9 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-0V-1 | FT450-A-A12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-A-12 | FT450-A-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-A-11 | FT450-A-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-A-25 | FT450-A-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | FT450-A-A6 | NEW-FUELPUMP-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-D-4 | FT450-A-A3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-B-11 | FT450-A-A20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-B-4 | FT450-A-A24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-B-6 | FT450-A-A21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-D-3 | FT450-A-A26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-D-10 | FT450-A-A22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-D-11 | FT450-A-A23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-D-22 | FT450-A-A25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ |
Bench test (before first power-up)
Battery disconnected, ECU and every sensor unplugged. Meter on resistance. Each pair below must read open (OL): a reading means a pinched wire, a stray strand or a mis-pinned cavity. Then check continuity of every wire (last column of the build checklist).
| # | Probe A | Probe B | Expect | Why | Reading |
|---|---|---|---|---|---|
| 1 | FT450-A-A12 | FT450-A-A13 | open (OL) | sensor ground must not touch +12 V supply | |
| 2 | FT450-A-A12 | NEW-BATT-1 | open (OL) | sensor ground must not touch +12 V supply | |
| 3 | FT450-A-A12 | NEW-KEYON-1 | open (OL) | sensor ground must not touch +12 V supply | |
| 4 | FT450-A-A12 | OEM-D-12 | open (OL) | sensor ground must not touch +12 V supply | |
| 5 | FT450-A-A7 | FT450-A-A13 | open (OL) | power ground must not touch +12 V supply | |
| 6 | FT450-A-A7 | NEW-BATT-1 | open (OL) | power ground must not touch +12 V supply | |
| 7 | FT450-A-A7 | NEW-KEYON-1 | open (OL) | power ground must not touch +12 V supply | |
| 8 | FT450-A-A7 | OEM-D-12 | open (OL) | power ground 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) | — | W11 | — | 0.5 | OEM-A-12 | — | — | — |
| A1 | Injector 1 (Bank A) | — | W13 | — | 0.5 | OEM-A-25 | — | — | — |
| A10 | Ignition 3 | — | — | — | — | — | — | — | — |
| A11 | Ignition 4 | — | — | — | — | — | — | — | — |
| A12 | Signal ground | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| A13 | +12V switched | — | W6 | — | 5.0 | MAIN-R-OUT | — | — | — |
| A14 | +5V sensor supply | — | — | — | — | — | — | — | — |
| A15 | CAN A LOW | — | — | — | — | — | — | — | — |
| A16 | CAN A HIGH | — | — | — | — | — | — | — | — |
| A17 | Phase input (cam) | — | — | — | — | — | — | — | — |
| A18 | RPM signal (crank −) | — | — | — | — | — | — | — | — |
| A19 | RPM signal (crank +) | — | — | — | — | — | — | — | — |
| A2 | Injector 2 (Bank A) | — | W12 | — | 0.5 | OEM-A-11 | — | — | — |
| A20 | White input 1 | — | W16 | — | 0.5 | OEM-B-11 | — | — | — |
| A21 | White input 2 | — | W18 | — | 0.5 | OEM-B-6 | — | — | — |
| A22 | White input 3 (TPS) | — | W20 | — | 0.5 | OEM-D-10 | — | — | — |
| A23 | White input 4 (oil pressure) | — | W21 | — | 0.5 | OEM-D-11 | — | — | — |
| A24 | White input 5 (water temp) | — | W17 | — | 0.5 | OEM-B-4 | — | — | — |
| A25 | White input 6 (fuel pressure) | — | W22 | — | 0.5 | OEM-D-22 | — | — | — |
| A26 | White input 7 (air temp) | — | W19 | — | 0.5 | OEM-D-3 | — | — | — |
| A3 | Aux 1 | — | W15 | — | 0.5 | OEM-D-4 | — | — | — |
| A4 | Aux 2 | — | — | — | — | — | — | — | — |
| A5 | Aux 3 | — | — | — | — | — | — | — | — |
| A6 | Aux 4 (fuel pump / relays) | — | W14 | — | 0.5 | NEW-FUELPUMP-1 | — | — | — |
| A7 | Power ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| A8 | Ignition 1 | — | — | — | — | — | — | — | — |
| A9 | Ignition 2 | — | — | — | — | — | — | — | — |
MAIN-R
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| COIL+ | Relay coil positive (ignition-switched +12V) | — | W3 | — | 0.5 | NEW-KEYON-1 | — | — | — |
| COIL- | Relay coil negative (ECU low-side driver) | — | W5 | — | 0.5 | SP-GND-1 | — | — | — |
| IN | Relay contact input (battery + via main fuse) | — | W4 | — | 5.0 | NEW-BATT-1 | — | — | — |
| OUT | Relay contact output (switched +12V bus) | — | W6 | — | 5.0 | FT450-A-A13 | — | — | — |
NEW-BATT
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W4 | — | 5.0 | MAIN-R-IN | — | — | — |
NEW-FUELPUMP
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W14 | — | 0.5 | FT450-A-A6 | — | — | — |
NEW-KEYON
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W3 | — | 0.5 | MAIN-R-COIL+ | — | — | — |
OEM-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 11 | Injectors 2 & 6 (No.20) | — | W12 | — | 0.5 | FT450-A-A2 | — | — | — |
| 12 | Injectors 1 & 4 (No.10) | — | W11 | — | 0.5 | FT450-A-A1 | — | — | — |
| 25 | Injectors 3 & 5 (No.30) | — | W13 | — | 0.5 | FT450-A-A1 | — | — | — |
| 26 | Power ground (E01/E02) | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
OEM-B
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 11 | Throttle position sensor (VTA) | — | W16 | — | 0.5 | FT450-A-A20 | — | — | — |
| 4 | Coolant temp (THW) | — | W17 | — | 0.5 | FT450-A-A24 | — | — | — |
| 6 | Primary O2 sensor (OX1) | — | W18 | — | 0.5 | FT450-A-A21 | — | — | — |
| 9 | Sensor ground (E1) | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
OEM-D
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 10 | A/C compressor request (A/C) | — | W20 | — | 0.5 | FT450-A-A22 | — | — | — |
| 11 | Starter signal (STA) | — | W21 | — | 0.5 | FT450-A-A23 | — | — | — |
| 12 | EFI main relay power (+B) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 13 | EFI main relay power (second feed) (+B1) | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 2 | Karman-vortex AFM signal (KS) | — | — | — | — | — | — | — | — |
| 22 | Neutral start switch (NSW) | — | W22 | — | 0.5 | FT450-A-A25 | — | — | — |
| 3 | Intake air temp (THA) | — | W19 | — | 0.5 | FT450-A-A26 | — | — | — |
| 4 | EFI main relay control (M-REL) | — | W15 | — | 0.5 | FT450-A-A3 | — | — | — |
| 5 | Knock sensor 1 (KNK1) | — | — | — | — | — | — | — | — |
| 9 | Vehicle speed sensor (SPD) | — | — | — | — | — | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W9 | — | 0.5 | OEM-B-9 | — | — | — |
| 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-D-12 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | OEM-D-13 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W5 | — | 0.5 | MAIN-R-COIL- | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-A-26 | — | — | — |
| 1 | — | — | W8 | — | 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 + MAIN-R-COIL- | Power ground + Relay coil negative (ECU low-side driver) | ground + load | corroborated | |
| OEM-B-11 | Throttle position sensor (VTA) | analog_in | FT450-A-A20 | White input 1 | analog_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 (E1) | sensor_ground | FT450-A-A12 | Signal ground | sensor_ground | corroborated | |
| OEM-D-10 | A/C compressor request (A/C) | digital_in | FT450-A-A22 | White input 3 (TPS) | analog_in | single_source | |
| OEM-D-11 | Starter signal (STA) | digital_in | FT450-A-A23 | White input 4 (oil pressure) | analog_in | single_source | |
| OEM-D-12 | EFI main relay power (+B) | power_in | — | — | — | single_source | |
| OEM-D-13 | EFI main relay power (second feed) (+B1) | power_in | — | — | — | single_source | |
| OEM-D-2 | Karman-vortex AFM signal (KS) | digital_in | — | — | — | single_source | |
| OEM-D-22 | Neutral start switch (NSW) | digital_in | FT450-A-A25 | White input 6 (fuel pressure) | analog_in | single_source | |
| OEM-D-3 | Intake air temp (THA) | temp_in | FT450-A-A26 | White input 7 (air temp) | temp_in | single_source | |
| OEM-D-4 | EFI main relay control (M-REL) | low_side_out | FT450-A-A3 | Aux 1 | low_side_out | single_source | |
| OEM-D-5 | Knock sensor 1 (KNK1) | knock_in | — | — | — | single_source | |
| OEM-D-9 | Vehicle speed sensor (SPD) | digital_in | — | — | — | corroborated |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-D-12 | SP-14V-1 | 0.85 | no route | EFI main relay power (+B) | — | |
| W2 | OEM-D-13 | SP-14V-1 | 0.85 | no route | EFI main relay power (second feed) (+B1) | — | |
| W3 | NEW-KEYON-1 | MAIN-R-COIL+ | 0.5 | no route | Relay coil positive (ignition-switched +12V) | — | |
| W4 | NEW-BATT-1 | MAIN-R-IN | 5.0 | no route | Relay contact input (battery + via main fuse) | — | |
| W5 | MAIN-R-COIL- | SP-GND-1 | 0.5 | no route | Relay coil negative (ECU low-side driver) | — | |
| W6 | MAIN-R-OUT | FT450-A-A13 | 5.0 | no route | Relay contact output (switched +12V bus) | — | |
| W7 | OEM-A-26 | SP-GND-1 | 0.85 | no route | Power ground (E01/E02) | — | |
| W8 | SP-GND-1 | FT450-A-A7 | 0.85 | no route | Power ground | — | |
| W9 | OEM-B-9 | SP-0V-1 | 0.5 | no route | Sensor ground (E1) | — | |
| W10 | SP-0V-1 | FT450-A-A12 | 0.5 | no route | Signal ground | — | |
| W11 | OEM-A-12 | FT450-A-A1 | 0.5 | no route | Injectors 1 & 4 (No.10) | — | |
| W12 | OEM-A-11 | FT450-A-A2 | 0.5 | no route | Injectors 2 & 6 (No.20) | — | |
| W13 | OEM-A-25 | FT450-A-A1 | 0.5 | no route | Injectors 3 & 5 (No.30) | — | |
| W14 | FT450-A-A6 | NEW-FUELPUMP-1 | 0.5 | no route | Aux 4 (fuel pump / relays) | — | |
| W15 | OEM-D-4 | FT450-A-A3 | 0.5 | no route | EFI main relay control (M-REL) | — | |
| W16 | OEM-B-11 | FT450-A-A20 | 0.5 | no route | Throttle position sensor (VTA) | — | |
| W17 | OEM-B-4 | FT450-A-A24 | 0.5 | no route | Coolant temp (THW) | — | |
| W18 | OEM-B-6 | FT450-A-A21 | 0.5 | no route | Primary O2 sensor (OX1) | — | |
| W19 | OEM-D-3 | FT450-A-A26 | 0.5 | no route | Intake air temp (THA) | — | |
| W20 | OEM-D-10 | FT450-A-A22 | 0.5 | no route | A/C compressor request (A/C) | — | |
| W21 | OEM-D-11 | FT450-A-A23 | 0.5 | no route | Starter signal (STA) | — | |
| W22 | OEM-D-22 | FT450-A-A25 | 0.5 | no route | Neutral start switch (NSW) | — |
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 (6)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | REQUIRED_UNMAPPED | OEM-D-2 | Required OEM function "Karman-vortex AFM signal (KS)" (digital_in) is not connected to the new ECU. |
| warn | 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. |
| warn | NET_FAMILY | OEM-D-10 ↔ FT450-A-A22 | OEM-D-10 "A/C compressor request (A/C)" [digital_in] is wired to FT450-A-A22 "White input 3 (TPS)" [analog_in]. Analog and digital on one net. A switch on an analog input works with a pull-up and a threshold; an analog sensor on a digital input loses its value. |
| warn | NET_FAMILY | OEM-D-11 ↔ FT450-A-A23 | OEM-D-11 "Starter signal (STA)" [digital_in] is wired to FT450-A-A23 "White input 4 (oil pressure)" [analog_in]. Analog and digital on one net. A switch on an analog input works with a pull-up and a threshold; an analog sensor on a digital input loses its value. |
| warn | NET_FAMILY | OEM-D-22 ↔ FT450-A-A25 | OEM-D-22 "Neutral start switch (NSW)" [digital_in] is wired to FT450-A-A25 "White input 6 (fuel pressure)" [analog_in]. Analog and digital on one net. A switch on an analog input works with a pull-up and a threshold; an analog sensor on a digital input loses its value. |
| info | UNMAPPED | OEM | 1 optional OEM pins are not mapped: OEM-D-9 Vehicle speed sensor (SPD) |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-D-5 | Knock input is a documented capability limit: this ECU has no built-in knock sensor input, so the stock knock sensor cannot be wired to it (run without knock control, or add an external knock module). | mapping-proposal |
Notes
Fit check: needs add-on. Resolve these before building: - Low-impedance injectors need peak-hold drivers or ballast resistors - 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 2026-10-23. Review every wire against both manuals before building. Open items: - OEM-D 5: Knock sensor 1 (KNK1): no free knock input on FuelTech FT450 - OEM-D 2: Karman-vortex AFM signal (KS): no free frequency_in/switch_in on FuelTech FT450 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 |
|---|---|---|---|---|---|---|
| 5 | oem_wiring_diagram | Toyota Supra A70 (MA70) 1990 EWD — TCCS (7M-GTE) System Circuit | — | — | — | — |
| 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 | 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 | — | — | — |
| 3 | forum | rusEFI Mazda Miata 2002 engine wiring | https://github.com/rusefi/rusefi/wiki/Mazda-Miata-2002 | archive | 2026-10-05 | cc3cae670408 |
| 2 | forum | AllPinouts: 1989–1992 Toyota Supra ECU | https://allpinouts.org/pinouts/connectors/car/1989-1992-toyota-supra-ecu/ | — | — | — |