Toyota Supra A70 1986-92 (7M-GTE) → DTAFast P8 (auto)
Toyota Supra A70 1986-92 (7M-GTE) — DTAFast — P8
⚠ 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 | 2: read the Findings page before cutting any wire |
| Size of the job | 18 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 | P8-C1-15 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-GND-1 | P8-C1-34 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | SP-GND-1 | P8-C1-55 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-B-9 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | SP-0V-1 | P8-C1-46 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | SP-0V-1 | P8-C1-47 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-0V-1 | P8-C1-49 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-0V-1 | P8-C1-51 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-A-12 | P8-C1-37 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-A-11 | P8-C1-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-A-25 | P8-C1-54 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-B-11 | P8-C1-48 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-B-4 | P8-C1-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-B-2 | P8-C1-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-B-6 | P8-C1-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-B-3 | P8-C1-45 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-D-9 | P8-C1-29 | 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) | — | W11 | — | 0.5 | P8-C1-18 | — | — | — |
| 12 | Injectors 1 & 4 (No.10) | — | W10 | — | 0.5 | P8-C1-37 | — | — | — |
| 25 | Injectors 3 & 5 (No.30) | — | W12 | — | 0.5 | P8-C1-54 | — | — | — |
| 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) | — | W13 | — | 0.5 | P8-C1-48 | — | — | — |
| 2 | Karman-vortex AFM signal (KS) | — | W15 | — | 0.5 | P8-C1-11 | — | — | — |
| 3 | Intake air temp (THA) | — | W17 | — | 0.5 | P8-C1-45 | — | — | — |
| 4 | Coolant temp (THW) | — | W14 | — | 0.5 | P8-C1-26 | — | — | — |
| 6 | Primary O2 sensor (OX1) | — | W16 | — | 0.5 | P8-C1-12 | — | — | — |
| 9 | Sensor ground (E2) | — | W5 | — | 0.5 | SP-0V-1 | — | — | — |
OEM-D
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 9 | Vehicle speed sensor (SPD) | — | W18 | — | 0.5 | P8-C1-29 | — | — | — |
P8-C1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Coil 1 | — | — | — | — | — | — | — | — |
| 10 | 5 Volts | — | — | — | — | — | — | — | — |
| 11 | Undriven Wheel (must) | — | W15 | — | 0.5 | OEM-B-2 | — | — | — |
| 12 | Lambda Signal | — | W16 | — | 0.5 | OEM-B-6 | — | — | — |
| 13 | Map2/ALS/Ana1 On/Off | — | — | — | — | — | — | — | — |
| 14 | Traction Wet/Dry | — | — | — | — | — | — | — | — |
| 15 | Power Ground | — | W2 | — | 0.85 | SP-GND-1 | — | — | — |
| 16 | Injector 8 | — | — | — | — | — | — | — | — |
| 17 | Injector 5 | — | — | — | — | — | — | — | — |
| 18 | Injector 2 | — | W11 | — | 0.5 | OEM-A-11 | — | — | — |
| 19 | 12 Volts | — | — | — | — | — | — | — | — |
| 2 | Coil 4 | — | — | — | — | — | — | — | — |
| 20 | Coil 3 | — | — | — | — | — | — | — | — |
| 21 | Turbo Pressure Valve | — | — | — | — | — | — | — | — |
| 22 | Coil 8/or Aux5 | — | — | — | — | — | — | — | — |
| 23 | Turbo ALS Valve | — | — | — | — | — | — | — | — |
| 24 | Tacho | — | — | — | — | — | — | — | — |
| 25 | Analogue Input 1 | — | — | — | — | — | — | — | — |
| 26 | Water Temp | — | W14 | — | 0.5 | OEM-B-4 | — | — | — |
| 27 | Cam Sensor | — | — | — | — | — | — | — | — |
| 28 | 5 Volts | — | — | — | — | — | — | — | — |
| 29 | Left Driven Wheel | — | W18 | — | 0.5 | OEM-D-9 | — | — | — |
| 3 | Coil 6 | — | — | — | — | — | — | — | — |
| 30 | Map | — | — | — | — | — | — | — | — |
| 31 | Launch Button | — | — | — | — | — | — | — | — |
| 32 | Traction On/Off | — | — | — | — | — | — | — | — |
| 33 | Shift Cut | — | — | — | — | — | — | — | — |
| 34 | Power Ground | — | W3 | — | 0.85 | SP-GND-1 | — | — | — |
| 35 | Injector 6 | — | — | — | — | — | — | — | — |
| 36 | Injector 4 | — | — | — | — | — | — | — | — |
| 37 | Injector 1 | — | W10 | — | 0.5 | OEM-A-12 | — | — | — |
| 38 | Coil 2 | — | — | — | — | — | — | — | — |
| 39 | Coil 5 | — | — | — | — | — | — | — | — |
| 4 | Idle Valve | — | — | — | — | — | — | — | — |
| 40 | Coil 7 | — | — | — | — | — | — | — | — |
| 41 | Fuel Pump Relay | — | — | — | — | — | — | — | — |
| 42 | Cam Phase Valve/Aux Out 4 | — | — | — | — | — | — | — | — |
| 43 | Aux Out 3 | — | — | — | — | — | — | — | — |
| 44 | Analogue Input 3 | — | — | — | — | — | — | — | — |
| 45 | Air Temp | — | W17 | — | 0.5 | OEM-B-3 | — | — | — |
| 46 | Signal Ground | — | W6 | — | 0.5 | SP-0V-1 | — | — | — |
| 47 | Signal Ground | — | W7 | — | 0.5 | SP-0V-1 | — | — | — |
| 48 | Throttle Wiper | — | W13 | — | 0.5 | OEM-B-11 | — | — | — |
| 49 | Lambda Earth | — | W8 | — | 0.5 | SP-0V-1 | — | — | — |
| 5 | Aux Out 2 | — | — | — | — | — | — | — | — |
| 50 | Undriven Wheel (optional) | — | — | — | — | — | — | — | — |
| 51 | Signal Ground | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| 52 | 5 Volts | — | — | — | — | — | — | — | — |
| 53 | Injector 7 | — | — | — | — | — | — | — | — |
| 54 | Injector 3 | — | W12 | — | 0.5 | OEM-A-25 | — | — | — |
| 55 | Power Ground | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| 6 | Shift Light | — | — | — | — | — | — | — | — |
| 7 | Analogue Input 2 Or Log Switch | — | — | — | — | — | — | — | — |
| 8 | Crank Sensor | — | — | — | — | — | — | — | — |
| 9 | Right Driven Wheel | — | — | — | — | — | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W5 | — | 0.5 | OEM-B-9 | — | — | — |
| 1 | — | — | W6 | — | 0.5 | P8-C1-46 | — | — | — |
| 1 | — | — | W7 | — | 0.5 | P8-C1-47 | — | — | — |
| 1 | — | — | W8 | — | 0.5 | P8-C1-49 | — | — | — |
| 1 | — | — | W9 | — | 0.5 | P8-C1-51 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-A-26 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | P8-C1-15 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | P8-C1-34 | — | — | — |
| 1 | — | — | W4 | — | 0.85 | P8-C1-55 | — | — | — |
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 | P8-C1-18 | Injector 2 | injector_out | corroborated | |
| OEM-A-12 | Injectors 1 & 4 (No.10) | injector_out | P8-C1-37 | Injector 1 | injector_out | corroborated | |
| OEM-A-25 | Injectors 3 & 5 (No.30) | injector_out | P8-C1-54 | Injector 3 | injector_out | corroborated | |
| OEM-A-26 | Power ground (E01/E02) | ground | P8-C1-15 + P8-C1-34 + P8-C1-55 | Power Ground + Power Ground + Power Ground | ground | corroborated | |
| OEM-B-11 | Throttle position sensor (VTA) | analog_in | P8-C1-48 | Throttle Wiper | analog_in | corroborated | |
| OEM-B-2 | Karman-vortex AFM signal (KS) | digital_in | P8-C1-11 | Undriven Wheel (must) | digital_in | corroborated | |
| OEM-B-3 | Intake air temp (THA) | temp_in | P8-C1-45 | Air Temp | temp_in | corroborated | |
| OEM-B-4 | Coolant temp (THW) | temp_in | P8-C1-26 | Water Temp | temp_in | corroborated | |
| OEM-B-6 | Primary O2 sensor (OX1) | lambda_nb_in | P8-C1-12 | Lambda Signal | lambda_nb_in | corroborated | |
| OEM-B-9 | Sensor ground (E2) | sensor_ground | P8-C1-46 + P8-C1-47 + P8-C1-49 + P8-C1-51 | Signal Ground + Signal Ground + Lambda Earth + Signal Ground | sensor_ground | corroborated | |
| OEM-D-9 | Vehicle speed sensor (SPD) | digital_in | P8-C1-29 | Left Driven Wheel | 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 | P8-C1-15 | 0.85 | no route | Power Ground | — | |
| W3 | SP-GND-1 | P8-C1-34 | 0.85 | no route | Power Ground | — | |
| W4 | SP-GND-1 | P8-C1-55 | 0.85 | no route | Power Ground | — | |
| W5 | OEM-B-9 | SP-0V-1 | 0.5 | no route | Sensor ground (E2) | — | |
| W6 | SP-0V-1 | P8-C1-46 | 0.5 | no route | Signal Ground | — | |
| W7 | SP-0V-1 | P8-C1-47 | 0.5 | no route | Signal Ground | — | |
| W8 | SP-0V-1 | P8-C1-49 | 0.5 | no route | Lambda Earth | — | |
| W9 | SP-0V-1 | P8-C1-51 | 0.5 | no route | Signal Ground | — | |
| W10 | OEM-A-12 | P8-C1-37 | 0.5 | no route | Injectors 1 & 4 (No.10) | — | |
| W11 | OEM-A-11 | P8-C1-18 | 0.5 | no route | Injectors 2 & 6 (No.20) | — | |
| W12 | OEM-A-25 | P8-C1-54 | 0.5 | no route | Injectors 3 & 5 (No.30) | — | |
| W13 | OEM-B-11 | P8-C1-48 | 0.5 | no route | Throttle position sensor (VTA) | — | |
| W14 | OEM-B-4 | P8-C1-26 | 0.5 | no route | Coolant temp (THW) | — | |
| W15 | OEM-B-2 | P8-C1-11 | 0.5 | no route | Karman-vortex AFM signal (KS) | — | |
| W16 | OEM-B-6 | P8-C1-12 | 0.5 | no route | Primary O2 sensor (OX1) | — | |
| W17 | OEM-B-3 | P8-C1-45 | 0.5 | no route | Intake air temp (THA) | — | |
| W18 | OEM-D-9 | P8-C1-29 | 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 (2)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | INJECTOR_BALLAST | P8 | The 7M-GTE injectors (7M-GTE fuel injector) are low-impedance, but P8 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 | PHYS_REQUIRED_OPEN | P8-C1-19 | P8-C1-19 "12 Volts" is required but not wired. |
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 - P8-C1 19: 12 Volts: required by DTAFast P8 but no stock pin feeds it; wire by hand - Fuel-pump control: DTAFast P8 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 | DTAFast P8Pro wiring schematic | https://dtafast.co.uk/pages/ecu-wiring-diagrams | — | — | — |
| 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/ | — | — | — |