Toyota Supra A70 1986-92 (7M-GTE) → ECUMASTER EMU Black (auto)
Toyota Supra A70 1986-92 (7M-GTE) — ECUMASTER — EMU Black
⚠ 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 · 7 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 | EMUBLACK-Black-27 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-GND-1 | EMUBLACK-Black-28 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | SP-GND-1 | EMUBLACK-Grey-17 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | SP-GND-1 | EMUBLACK-Grey-24 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-B-9 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | SP-0V-1 | EMUBLACK-Black-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-0V-1 | EMUBLACK-Black-38 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-0V-1 | EMUBLACK-Black-39 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-A-12 | EMUBLACK-Grey-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-A-11 | EMUBLACK-Grey-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-A-25 | EMUBLACK-Grey-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-B-11 | EMUBLACK-Black-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-B-4 | EMUBLACK-Black-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-B-2 | EMUBLACK-Black-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-B-6 | EMUBLACK-Black-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-B-3 | EMUBLACK-Black-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-D-9 | EMUBLACK-Black-10 | 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
EMUBLACK-Black
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Ignition coil #5 | — | — | — | — | — | — | — | — |
| 10 | Switch #1 In | — | W18 | — | 0.5 | OEM-D-9 | — | — | — |
| 11 | RS232 TXD | — | — | — | — | — | — | — | — |
| 12 | CAN H | — | — | — | — | — | — | — | — |
| 13 | Battery +12V | — | — | — | — | — | — | — | — |
| 14 | Ignition coil #4 | — | — | — | — | — | — | — | — |
| 15 | EGT in #2 | — | — | — | — | — | — | — | — |
| 16 | Knock Sensor in #2 | — | — | — | — | — | — | — | — |
| 17 | Analog In #3 | — | — | — | — | — | — | — | — |
| 18 | TPS In | — | W13 | — | 0.5 | OEM-B-11 | — | — | — |
| 19 | WBO Ip | — | — | — | — | — | — | — | — |
| 2 | EGT in #1 | — | — | — | — | — | — | — | — |
| 20 | VSS In | — | W15 | — | 0.5 | OEM-B-2 | — | — | — |
| 21 | Camsync In #1 | — | — | — | — | — | — | — | — |
| 22 | WBO Rcal | — | — | — | — | — | — | — | — |
| 23 | Switch #2 In | — | — | — | — | — | — | — | — |
| 24 | RS232 RXD | — | — | — | — | — | — | — | — |
| 25 | CAN L | — | — | — | — | — | — | — | — |
| 26 | +5V supply | — | — | — | — | — | — | — | — |
| 27 | Power Ground | — | W2 | — | 0.85 | SP-GND-1 | — | — | — |
| 28 | Ecu Ground | — | W3 | — | 0.85 | SP-GND-1 | — | — | — |
| 29 | Sensor Ground | — | W7 | — | 0.5 | SP-0V-1 | — | — | — |
| 3 | Knock Sensor in #1 | — | — | — | — | — | — | — | — |
| 30 | Analog In #4 | — | — | — | — | — | — | — | — |
| 31 | Analog In #1 | — | W16 | — | 0.5 | OEM-B-6 | — | — | — |
| 32 | IAT In | — | W17 | — | 0.5 | OEM-B-3 | — | — | — |
| 33 | WBO VGND | — | — | — | — | — | — | — | — |
| 34 | +5V supply | — | — | — | — | — | — | — | — |
| 35 | Analog In #5 | — | — | — | — | — | — | — | — |
| 36 | Switch #3 In | — | — | — | — | — | — | — | — |
| 37 | Analog In #6 | — | — | — | — | — | — | — | — |
| 38 | Sensor Ground | — | W8 | — | 0.5 | SP-0V-1 | — | — | — |
| 39 | Sensor Ground | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| 4 | Analog In #2 | — | — | — | — | — | — | — | — |
| 5 | CLT In | — | W14 | — | 0.5 | OEM-B-4 | — | — | — |
| 6 | WBO Vs | — | — | — | — | — | — | — | — |
| 7 | Camsync In #2 | — | — | — | — | — | — | — | — |
| 8 | Primary trigger | — | — | — | — | — | — | — | — |
| 9 | Flex Fuel In | — | — | — | — | — | — | — | — |
EMUBLACK-Grey
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Ignition coil #6 | — | — | — | — | — | — | — | — |
| 10 | H-Bridge #1 Winding B | — | — | — | — | — | — | — | — |
| 11 | H-Bridge #2 Winding B | — | — | — | — | — | — | — | — |
| 12 | AUX 5 | — | — | — | — | — | — | — | — |
| 13 | AUX 2 / Injector #8 | — | — | — | — | — | — | — | — |
| 14 | Injector #5 | — | — | — | — | — | — | — | — |
| 15 | Injector #2 | — | W11 | — | 0.5 | OEM-A-11 | — | — | — |
| 16 | Ignition coil #2 | — | — | — | — | — | — | — | — |
| 17 | Power Ground | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| 18 | Ignition +12V | — | — | — | — | — | — | — | — |
| 19 | WBO Heater | — | — | — | — | — | — | — | — |
| 2 | H-Bridge #1 Winding A | — | — | — | — | — | — | — | — |
| 20 | AUX 4 / Tacho | — | — | — | — | — | — | — | — |
| 21 | AUX 1 / Injector #7 | — | — | — | — | — | — | — | — |
| 22 | Injector #6 | — | — | — | — | — | — | — | — |
| 23 | Injector #3 | — | W12 | — | 0.5 | OEM-A-25 | — | — | — |
| 24 | Power Ground | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 3 | H-Bridge #2 Winding A | — | — | — | — | — | — | — | — |
| 4 | AUX 6 | — | — | — | — | — | — | — | — |
| 5 | AUX 3 | — | — | — | — | — | — | — | — |
| 6 | Injector #4 | — | — | — | — | — | — | — | — |
| 7 | Injector #1 | — | W10 | — | 0.5 | OEM-A-12 | — | — | — |
| 8 | Ignition coil #1 | — | — | — | — | — | — | — | — |
| 9 | Ignition coil #3 | — | — | — | — | — | — | — | — |
OEM-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 11 | Injectors 2 & 6 (No.20) | — | W11 | — | 0.5 | EMUBLACK-Grey-15 | — | — | — |
| 12 | Injectors 1 & 4 (No.10) | — | W10 | — | 0.5 | EMUBLACK-Grey-7 | — | — | — |
| 25 | Injectors 3 & 5 (No.30) | — | W12 | — | 0.5 | EMUBLACK-Grey-23 | — | — | — |
| 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 | EMUBLACK-Black-18 | — | — | — |
| 2 | Karman-vortex AFM signal (KS) | — | W15 | — | 0.5 | EMUBLACK-Black-20 | — | — | — |
| 3 | Intake air temp (THA) | — | W17 | — | 0.5 | EMUBLACK-Black-32 | — | — | — |
| 4 | Coolant temp (THW) | — | W14 | — | 0.5 | EMUBLACK-Black-5 | — | — | — |
| 6 | Primary O2 sensor (OX1) | — | W16 | — | 0.5 | EMUBLACK-Black-31 | — | — | — |
| 9 | Sensor ground (E2) | — | W6 | — | 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 | EMUBLACK-Black-10 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W6 | — | 0.5 | OEM-B-9 | — | — | — |
| 1 | — | — | W7 | — | 0.5 | EMUBLACK-Black-29 | — | — | — |
| 1 | — | — | W8 | — | 0.5 | EMUBLACK-Black-38 | — | — | — |
| 1 | — | — | W9 | — | 0.5 | EMUBLACK-Black-39 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-A-26 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | EMUBLACK-Black-27 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | EMUBLACK-Black-28 | — | — | — |
| 1 | — | — | W4 | — | 0.85 | EMUBLACK-Grey-17 | — | — | — |
| 1 | — | — | W5 | — | 0.85 | EMUBLACK-Grey-24 | — | — | — |
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 | EMUBLACK-Grey-15 | Injector #2 | injector_out | corroborated | |
| OEM-A-12 | Injectors 1 & 4 (No.10) | injector_out | EMUBLACK-Grey-7 | Injector #1 | injector_out | corroborated | |
| OEM-A-25 | Injectors 3 & 5 (No.30) | injector_out | EMUBLACK-Grey-23 | Injector #3 | injector_out | corroborated | |
| OEM-A-26 | Power ground (E01/E02) | ground | EMUBLACK-Black-27 + EMUBLACK-Black-28 + EMUBLACK-Grey-17 + EMUBLACK-Grey-24 | Power Ground + Ecu Ground + Power Ground + Power Ground | ground | corroborated | |
| OEM-B-11 | Throttle position sensor (VTA) | analog_in | EMUBLACK-Black-18 | TPS In | analog_in | corroborated | |
| OEM-B-2 | Karman-vortex AFM signal (KS) | digital_in | EMUBLACK-Black-20 | VSS In | digital_in | corroborated | |
| OEM-B-3 | Intake air temp (THA) | temp_in | EMUBLACK-Black-32 | IAT In | temp_in | corroborated | |
| OEM-B-4 | Coolant temp (THW) | temp_in | EMUBLACK-Black-5 | CLT In | temp_in | corroborated | |
| OEM-B-6 | Primary O2 sensor (OX1) | lambda_nb_in | EMUBLACK-Black-31 | Analog In #1 | analog_in | corroborated | |
| OEM-B-9 | Sensor ground (E2) | sensor_ground | EMUBLACK-Black-29 + EMUBLACK-Black-38 + EMUBLACK-Black-39 | Sensor Ground + Sensor Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-D-9 | Vehicle speed sensor (SPD) | digital_in | EMUBLACK-Black-10 | Switch #1 In | 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 | EMUBLACK-Black-27 | 0.85 | no route | Power Ground | — | |
| W3 | SP-GND-1 | EMUBLACK-Black-28 | 0.85 | no route | Ecu Ground | — | |
| W4 | SP-GND-1 | EMUBLACK-Grey-17 | 0.85 | no route | Power Ground | — | |
| W5 | SP-GND-1 | EMUBLACK-Grey-24 | 0.85 | no route | Power Ground | — | |
| W6 | OEM-B-9 | SP-0V-1 | 0.5 | no route | Sensor ground (E2) | — | |
| W7 | SP-0V-1 | EMUBLACK-Black-29 | 0.5 | no route | Sensor Ground | — | |
| W8 | SP-0V-1 | EMUBLACK-Black-38 | 0.5 | no route | Sensor Ground | — | |
| W9 | SP-0V-1 | EMUBLACK-Black-39 | 0.5 | no route | Sensor Ground | — | |
| W10 | OEM-A-12 | EMUBLACK-Grey-7 | 0.5 | no route | Injectors 1 & 4 (No.10) | — | |
| W11 | OEM-A-11 | EMUBLACK-Grey-15 | 0.5 | no route | Injectors 2 & 6 (No.20) | — | |
| W12 | OEM-A-25 | EMUBLACK-Grey-23 | 0.5 | no route | Injectors 3 & 5 (No.30) | — | |
| W13 | OEM-B-11 | EMUBLACK-Black-18 | 0.5 | no route | Throttle position sensor (VTA) | — | |
| W14 | OEM-B-4 | EMUBLACK-Black-5 | 0.5 | no route | Coolant temp (THW) | — | |
| W15 | OEM-B-2 | EMUBLACK-Black-20 | 0.5 | no route | Karman-vortex AFM signal (KS) | — | |
| W16 | OEM-B-6 | EMUBLACK-Black-31 | 0.5 | no route | Primary O2 sensor (OX1) | — | |
| W17 | OEM-B-3 | EMUBLACK-Black-32 | 0.5 | no route | Intake air temp (THA) | — | |
| W18 | OEM-D-9 | EMUBLACK-Black-10 | 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 (3)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | INJECTOR_BALLAST | EMU Black | The 7M-GTE injectors (7M-GTE fuel injector) are low-impedance, but EMU Black 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 | EMUBLACK-Black-13 | EMUBLACK-Black-13 "Battery +12V" is required but not wired. |
| warn | NO_FUEL_PUMP | fuel pump | This engine harness has no fuel-pump control path: no fuel-pump relay output is wired to the new ECU. If the stock car switches the pump outside the ECU (an airflow-meter contact or a separate module), the standalone must drive the pump relay itself — see the install notes for this car. |
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 (No named 7M-GTE decoder.) 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 - EMUBLACK-Black 13: Battery +12V: required by ECUMASTER EMU Black but no stock pin feeds it; wire by hand - Fuel-pump control: ECUMASTER EMU Black 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: - EMUBLACK-Grey 18: Ignition +12V: not fed (the stock ECU has no ignition-sense pin); feed it from a switched-ignition source
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | ECUMASTER EMU Black — pinout (Black 39-pin / Grey 24-pin) | https://www.ecumaster.com/wp/wp-content/uploads/2020/05/EMU_Black_pinout.pdf | archive | 2026-10-05 | 096b2b4df1bd |
| 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/ | — | — | — |