Toyota Supra A70 1986-92 (7M-GTE) → Speeduino Speeduino v0.4 (auto)
Toyota Supra A70 1986-92 (7M-GTE) — Speeduino — Speeduino
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 2026-10-11
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 | 15 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 | SPEEDUINO-A-10 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-GND-1 | SPEEDUINO-A-9 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-B-9 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | SP-0V-1 | SPEEDUINO-A-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | SP-0V-1 | SPEEDUINO-A-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-A-12 | SPEEDUINO-A-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | OEM-A-11 | SPEEDUINO-A-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-A-25 | SPEEDUINO-A-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-B-11 | SPEEDUINO-A-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-B-4 | SPEEDUINO-A-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-B-2 | SPEEDUINO-A-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-B-6 | SPEEDUINO-A-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-B-3 | SPEEDUINO-A-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-D-9 | SPEEDUINO-A-18 | 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
OEM-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 11 | Injectors 2 & 6 (No.20) | — | W8 | — | 0.5 | SPEEDUINO-A-2 | — | — | — |
| 12 | Injectors 1 & 4 (No.10) | — | W7 | — | 0.5 | SPEEDUINO-A-1 | — | — | — |
| 25 | Injectors 3 & 5 (No.30) | — | W9 | — | 0.5 | SPEEDUINO-A-3 | — | — | — |
| 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) | — | W10 | — | 0.5 | SPEEDUINO-A-22 | — | — | — |
| 2 | Karman-vortex AFM signal (KS) | — | W12 | — | 0.5 | SPEEDUINO-A-14 | — | — | — |
| 3 | Intake air temp (THA) | — | W14 | — | 0.5 | SPEEDUINO-A-20 | — | — | — |
| 4 | Coolant temp (THW) | — | W11 | — | 0.5 | SPEEDUINO-A-19 | — | — | — |
| 6 | Primary O2 sensor (OX1) | — | W13 | — | 0.5 | SPEEDUINO-A-21 | — | — | — |
| 9 | Sensor ground (E2) | — | W4 | — | 0.5 | SP-0V-1 | — | — | — |
OEM-D
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 9 | Vehicle speed sensor (SPD) | — | W15 | — | 0.5 | SPEEDUINO-A-18 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W4 | — | 0.5 | OEM-B-9 | — | — | — |
| 1 | — | — | W5 | — | 0.5 | SPEEDUINO-A-12 | — | — | — |
| 1 | — | — | W6 | — | 0.5 | SPEEDUINO-A-23 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-A-26 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | SPEEDUINO-A-10 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | SPEEDUINO-A-9 | — | — | — |
SPEEDUINO-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injector 1 | — | W7 | — | 0.5 | OEM-A-12 | — | — | — |
| 10 | Ground | — | W2 | — | 0.85 | SP-GND-1 | — | — | — |
| 11 | MAP sensor (0-5V) | — | — | — | — | — | — | — | — |
| 12 | Ground | — | W5 | — | 0.5 | SP-0V-1 | — | — | — |
| 13 | 5V | — | — | — | — | — | — | — | — |
| 14 | Proto area 1 (flex fuel) | — | W12 | — | 0.5 | OEM-B-2 | — | — | — |
| 15 | Proto area 2 (fan) | — | — | — | — | — | — | — | — |
| 16 | Proto area 3 (fuel pump) | — | — | — | — | — | — | — | — |
| 17 | Proto area 4 (tachometer) | — | — | — | — | — | — | — | — |
| 18 | Proto area 5 (clutch) | — | W15 | — | 0.5 | OEM-D-9 | — | — | — |
| 19 | Coolant temp (CLT) | — | W11 | — | 0.5 | OEM-B-4 | — | — | — |
| 2 | Injector 2 | — | W8 | — | 0.5 | OEM-A-11 | — | — | — |
| 20 | Inlet air temp (IAT) | — | W14 | — | 0.5 | OEM-B-3 | — | — | — |
| 21 | O2 sensor | — | W13 | — | 0.5 | OEM-B-6 | — | — | — |
| 22 | TPS input | — | W10 | — | 0.5 | OEM-B-11 | — | — | — |
| 23 | Ground | — | W6 | — | 0.5 | SP-0V-1 | — | — | — |
| 24 | Cam input / VR2+ | — | — | — | — | — | — | — | — |
| 25 | Crank input / VR1+ | — | — | — | — | — | — | — | — |
| 26 | VR2- | — | — | — | — | — | — | — | — |
| 27 | VR1- | — | — | — | — | — | — | — | — |
| 28 | 5V | — | — | — | — | — | — | — | — |
| 29 | Idle stepper 2B | — | — | — | — | — | — | — | — |
| 3 | Injector 3 | — | W9 | — | 0.5 | OEM-A-25 | — | — | — |
| 30 | Idle stepper 2A | — | — | — | — | — | — | — | — |
| 31 | Idle stepper 1A | — | — | — | — | — | — | — | — |
| 32 | Idle stepper 1B | — | — | — | — | — | — | — | — |
| 33 | Ignition 3 | — | — | — | — | — | — | — | — |
| 34 | Ignition 2 | — | — | — | — | — | — | — | — |
| 35 | Boost | — | — | — | — | — | — | — | — |
| 36 | Idle 2 (3-wire idle) | — | — | — | — | — | — | — | — |
| 37 | PWM idle | — | — | — | — | — | — | — | — |
| 38 | VVT | — | — | — | — | — | — | — | — |
| 5 | Injector 4 | — | — | — | — | — | — | — | — |
| 7 | Ignition 1 | — | — | — | — | — | — | — | — |
| 8 | Ignition 4 | — | — | — | — | — | — | — | — |
| 9 | Ground | — | W3 | — | 0.85 | SP-GND-1 | — | — | — |
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 | SPEEDUINO-A-2 | Injector 2 | injector_out | corroborated | |
| OEM-A-12 | Injectors 1 & 4 (No.10) | injector_out | SPEEDUINO-A-1 | Injector 1 | injector_out | corroborated | |
| OEM-A-25 | Injectors 3 & 5 (No.30) | injector_out | SPEEDUINO-A-3 | Injector 3 | injector_out | corroborated | |
| OEM-A-26 | Power ground (E01/E02) | ground | SPEEDUINO-A-10 + SPEEDUINO-A-9 | Ground + Ground | ground | corroborated | |
| OEM-B-11 | Throttle position sensor (VTA) | analog_in | SPEEDUINO-A-22 | TPS input | analog_in | corroborated | |
| OEM-B-2 | Karman-vortex AFM signal (KS) | digital_in | SPEEDUINO-A-14 | Proto area 1 (flex fuel) | digital_in | corroborated | |
| OEM-B-3 | Intake air temp (THA) | temp_in | SPEEDUINO-A-20 | Inlet air temp (IAT) | temp_in | corroborated | |
| OEM-B-4 | Coolant temp (THW) | temp_in | SPEEDUINO-A-19 | Coolant temp (CLT) | temp_in | corroborated | |
| OEM-B-6 | Primary O2 sensor (OX1) | lambda_nb_in | SPEEDUINO-A-21 | O2 sensor | lambda_nb_in | corroborated | |
| OEM-B-9 | Sensor ground (E2) | sensor_ground | SPEEDUINO-A-12 + SPEEDUINO-A-23 | Ground + Ground | sensor_ground | corroborated | |
| OEM-D-9 | Vehicle speed sensor (SPD) | digital_in | SPEEDUINO-A-18 | Proto area 5 (clutch) | 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 | SPEEDUINO-A-10 | 0.85 | no route | Ground | — | |
| W3 | SP-GND-1 | SPEEDUINO-A-9 | 0.85 | no route | Ground | — | |
| W4 | OEM-B-9 | SP-0V-1 | 0.5 | no route | Sensor ground (E2) | — | |
| W5 | SP-0V-1 | SPEEDUINO-A-12 | 0.5 | no route | Ground | — | |
| W6 | SP-0V-1 | SPEEDUINO-A-23 | 0.5 | no route | Ground | — | |
| W7 | OEM-A-12 | SPEEDUINO-A-1 | 0.5 | no route | Injectors 1 & 4 (No.10) | — | |
| W8 | OEM-A-11 | SPEEDUINO-A-2 | 0.5 | no route | Injectors 2 & 6 (No.20) | — | |
| W9 | OEM-A-25 | SPEEDUINO-A-3 | 0.5 | no route | Injectors 3 & 5 (No.30) | — | |
| W10 | OEM-B-11 | SPEEDUINO-A-22 | 0.5 | no route | Throttle position sensor (VTA) | — | |
| W11 | OEM-B-4 | SPEEDUINO-A-19 | 0.5 | no route | Coolant temp (THW) | — | |
| W12 | OEM-B-2 | SPEEDUINO-A-14 | 0.5 | no route | Karman-vortex AFM signal (KS) | — | |
| W13 | OEM-B-6 | SPEEDUINO-A-21 | 0.5 | no route | Primary O2 sensor (OX1) | — | |
| W14 | OEM-B-3 | SPEEDUINO-A-20 | 0.5 | no route | Intake air temp (THA) | — | |
| W15 | OEM-D-9 | SPEEDUINO-A-18 | 0.5 | no route | Vehicle speed sensor (SPD) | — |
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 (1)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | INJECTOR_BALLAST | Speeduino | The 7M-GTE injectors (7M-GTE fuel injector) are low-impedance, but Speeduino 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. |
Accepted (0)
| Code | Subject | Reason | By |
|---|
Notes
Fit check: unconfirmed. Confirm these before building: - Trigger pattern for Toyota 7M-GTE not found in the ECU's docs (Confirmed absent from documented trigger/decoder list. No 7M-GTE (24+2 Nippondenso CAS) decoder exists. The 'Toyota 3 tooth cam' decoder covers 1UZ/1JZ/2JZ-VVT-i/1FZ-FE, not the 7M.) - Only 4 ignition outputs for 6 cylinders: wasted spark (pair coils per firing order) - Only 4 injector outputs for 6 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: - Main-relay feed: no ecu_main_power pin on the stock or the new ECU - Fuel-pump control: Speeduino Speeduino 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.
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | Speeduino Manual (08/04/25) — V0.4 board IDC40 pinout & features | https://speeduino.com/Speeduino_manual.pdf | archive | 2026-10-05 | 21806bd29ef0 |
| 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/ | — | — | — |