Toyota Supra A70 1986-92 (7M-GTE) → Motorsport Electronics ME442 (auto)
Toyota Supra A70 1986-92 (7M-GTE) — Motorsport Electronics — ME442
⚠ 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 | 3: read the Findings page before cutting any wire |
| Size of the job | 17 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 | ME442-C1-10 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-GND-1 | ME442-C1-61 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | SP-GND-1 | ME442-C1-89 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | SP-GND-1 | ME442-C1-90 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-B-9 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | SP-0V-1 | ME442-C1-52 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-0V-1 | ME442-C1-84 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-A-12 | ME442-C1-63 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-A-11 | ME442-C1-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-A-25 | ME442-C1-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-B-11 | ME442-C1-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-B-4 | ME442-C1-86 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-B-2 | ME442-C1-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-B-6 | ME442-C1-56 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-B-3 | ME442-C1-57 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-D-9 | ME442-C1-7 | 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
ME442-C1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | COIL 4 | — | — | — | — | — | — | — | — |
| 10 | GROUND CHASSIS | — | W2 | — | 0.85 | SP-GND-1 | — | — | — |
| 11 | EGT 1 | — | — | — | — | — | — | — | — |
| 12 | LOW SIDE 2 | — | — | — | — | — | — | — | — |
| 13 | LOW SIDE RELAY 15 | — | — | — | — | — | — | — | — |
| 14 | LSU +12V | — | — | — | — | — | — | — | — |
| 15 | IGN +12V | — | — | — | — | — | — | — | — |
| 16 | LSU HEATER -VE | — | — | — | — | — | — | — | — |
| 17 | ANA VOLT 3 | — | — | — | — | — | — | — | — |
| 18 | ANA VOLT 4 | — | — | — | — | — | — | — | — |
| 19 | LSU UN | — | — | — | — | — | — | — | — |
| 2 | COIL 3 | — | — | — | — | — | — | — | — |
| 20 | LSU VM | — | — | — | — | — | — | — | — |
| 21 | CAN 1 HIGH | — | — | — | — | — | — | — | — |
| 22 | CAM A VR+ | — | — | — | — | — | — | — | — |
| 23 | CAM A VR- | — | — | — | — | — | — | — | — |
| 24 | SERIAL 1 GROUND | — | — | — | — | — | — | — | — |
| 25 | SERIAL 1 TX | — | — | — | — | — | — | — | — |
| 26 | ANA VOLT 1 | — | W12 | — | 0.5 | OEM-B-11 | — | — | — |
| 27 | INJECTOR 8 | — | — | — | — | — | — | — | — |
| 28 | INJECTOR 5 | — | — | — | — | — | — | — | — |
| 29 | COIL 7 | — | — | — | — | — | — | — | — |
| 3 | INJECTOR 4 | — | — | — | — | — | — | — | — |
| 30 | COIL 8 | — | — | — | — | — | — | — | — |
| 31 | COIL 2 | — | — | — | — | — | — | — | — |
| 32 | COIL 1 | — | — | — | — | — | — | — | — |
| 33 | INJECTOR 3 | — | W11 | — | 0.5 | OEM-A-25 | — | — | — |
| 34 | DIG_IN 6 | — | — | — | — | — | — | — | — |
| 35 | USB D+ | — | — | — | — | — | — | — | — |
| 36 | USB D- | — | — | — | — | — | — | — | — |
| 37 | LOW SIDE RELAY 11 | — | — | — | — | — | — | — | — |
| 38 | USB VBUS | — | — | — | — | — | — | — | — |
| 39 | LOW SIDE 6 | — | — | — | — | — | — | — | — |
| 4 | INJECTOR 2 | — | W10 | — | 0.5 | OEM-A-11 | — | — | — |
| 40 | LOW SIDE RELAY 17 | — | — | — | — | — | — | — | — |
| 41 | USB GROUND | — | — | — | — | — | — | — | — |
| 42 | LOW SIDE RELAY 12 | — | — | — | — | — | — | — | — |
| 43 | LOW SIDE RELAY 14 | — | — | — | — | — | — | — | — |
| 44 | LOW SIDE 4 | — | — | — | — | — | — | — | — |
| 45 | 5V REF | — | — | — | — | — | — | — | — |
| 46 | 5V REF | — | — | — | — | — | — | — | — |
| 47 | ANA TEMP 4 | — | — | — | — | — | — | — | — |
| 48 | ANA VOLT 7 | — | — | — | — | — | — | — | — |
| 49 | LSU IA | — | — | — | — | — | — | — | — |
| 5 | DIG_IN 4 | — | — | — | — | — | — | — | — |
| 50 | LSU IP | — | — | — | — | — | — | — | — |
| 51 | CAN 1 LOW | — | — | — | — | — | — | — | — |
| 52 | SENSORS GROUND | — | W7 | — | 0.5 | SP-0V-1 | — | — | — |
| 53 | KNOCK 1 SIGNAL | — | — | — | — | — | — | — | — |
| 54 | KNOCK 2 SIGNAL | — | — | — | — | — | — | — | — |
| 55 | SERIAL 1 RX | — | — | — | — | — | — | — | — |
| 56 | ANA VOLT 2 | — | W15 | — | 0.5 | OEM-B-6 | — | — | — |
| 57 | ANA TEMP 2 | — | W16 | — | 0.5 | OEM-B-3 | — | — | — |
| 58 | INJECTOR 6 | — | — | — | — | — | — | — | — |
| 59 | COIL 5 | — | — | — | — | — | — | — | — |
| 6 | DIG_IN 1 | — | W14 | — | 0.5 | OEM-B-2 | — | — | — |
| 60 | COIL 6 | — | — | — | — | — | — | — | — |
| 61 | GROUND | — | W3 | — | 0.85 | SP-GND-1 | — | — | — |
| 62 | DIG_IN 5 | — | — | — | — | — | — | — | — |
| 63 | INJECTOR 1 | — | W9 | — | 0.5 | OEM-A-12 | — | — | — |
| 64 | VBAT | — | — | — | — | — | — | — | — |
| 65 | H-BRIDGE A OUT 1 | — | — | — | — | — | — | — | — |
| 66 | H-BRIDGE A OUT 2 | — | — | — | — | — | — | — | — |
| 67 | Stepper 1 / A1 | — | — | — | — | — | — | — | — |
| 68 | Stepper 2 / A2 | — | — | — | — | — | — | — | — |
| 69 | LOW SIDE 5 | — | — | — | — | — | — | — | — |
| 7 | DIG_IN 2 | — | W17 | — | 0.5 | OEM-D-9 | — | — | — |
| 70 | Stepper 3 / B1 | — | — | — | — | — | — | — | — |
| 71 | Stepper 4 / B2 | — | — | — | — | — | — | — | — |
| 72 | LOW SIDE RELAY 13 | — | — | — | — | — | — | — | — |
| 73 | LOW SIDE 1 | — | — | — | — | — | — | — | — |
| 74 | LOW SIDE 3 | — | — | — | — | — | — | — | — |
| 75 | LOW SIDE RELAY 16 | — | — | — | — | — | — | — | — |
| 76 | 5V REF | — | — | — | — | — | — | — | — |
| 77 | ANA TEMP 3 | — | — | — | — | — | — | — | — |
| 78 | ANA VOLT 6 | — | — | — | — | — | — | — | — |
| 79 | TACHOMETER | — | — | — | — | — | — | — | — |
| 8 | DIG_IN 3 | — | — | — | — | — | — | — | — |
| 80 | CRANK VR+ | — | — | — | — | — | — | — | — |
| 81 | CRANK VR- | — | — | — | — | — | — | — | — |
| 82 | CAM B VR+ | — | — | — | — | — | — | — | — |
| 83 | CAM B VR- | — | — | — | — | — | — | — | — |
| 84 | Sensor Ground | — | W8 | — | 0.5 | SP-0V-1 | — | — | — |
| 86 | ANA TEMP 1 | — | W13 | — | 0.5 | OEM-B-4 | — | — | — |
| 87 | ANA VOLT 5 | — | — | — | — | — | — | — | — |
| 88 | INJECTOR 7 | — | — | — | — | — | — | — | — |
| 89 | GROUND | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| 9 | LOW SIDE RELAY 18 | — | — | — | — | — | — | — | — |
| 90 | GROUND | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
OEM-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 11 | Injectors 2 & 6 (No.20) | — | W10 | — | 0.5 | ME442-C1-4 | — | — | — |
| 12 | Injectors 1 & 4 (No.10) | — | W9 | — | 0.5 | ME442-C1-63 | — | — | — |
| 25 | Injectors 3 & 5 (No.30) | — | W11 | — | 0.5 | ME442-C1-33 | — | — | — |
| 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) | — | W12 | — | 0.5 | ME442-C1-26 | — | — | — |
| 2 | Karman-vortex AFM signal (KS) | — | W14 | — | 0.5 | ME442-C1-6 | — | — | — |
| 3 | Intake air temp (THA) | — | W16 | — | 0.5 | ME442-C1-57 | — | — | — |
| 4 | Coolant temp (THW) | — | W13 | — | 0.5 | ME442-C1-86 | — | — | — |
| 6 | Primary O2 sensor (OX1) | — | W15 | — | 0.5 | ME442-C1-56 | — | — | — |
| 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) | — | W17 | — | 0.5 | ME442-C1-7 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W6 | — | 0.5 | OEM-B-9 | — | — | — |
| 1 | — | — | W7 | — | 0.5 | ME442-C1-52 | — | — | — |
| 1 | — | — | W8 | — | 0.5 | ME442-C1-84 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-A-26 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | ME442-C1-10 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | ME442-C1-61 | — | — | — |
| 1 | — | — | W4 | — | 0.85 | ME442-C1-89 | — | — | — |
| 1 | — | — | W5 | — | 0.85 | ME442-C1-90 | — | — | — |
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 | ME442-C1-4 | INJECTOR 2 | injector_out | corroborated | |
| OEM-A-12 | Injectors 1 & 4 (No.10) | injector_out | ME442-C1-63 | INJECTOR 1 | injector_out | corroborated | |
| OEM-A-25 | Injectors 3 & 5 (No.30) | injector_out | ME442-C1-33 | INJECTOR 3 | injector_out | corroborated | |
| OEM-A-26 | Power ground (E01/E02) | ground | ME442-C1-10 + ME442-C1-61 + ME442-C1-89 + ME442-C1-90 | GROUND CHASSIS + GROUND + GROUND + GROUND | ground | corroborated | |
| OEM-B-11 | Throttle position sensor (VTA) | analog_in | ME442-C1-26 | ANA VOLT 1 | analog_in | corroborated | |
| OEM-B-2 | Karman-vortex AFM signal (KS) | digital_in | ME442-C1-6 | DIG_IN 1 | digital_in | corroborated | |
| OEM-B-3 | Intake air temp (THA) | temp_in | ME442-C1-57 | ANA TEMP 2 | temp_in | corroborated | |
| OEM-B-4 | Coolant temp (THW) | temp_in | ME442-C1-86 | ANA TEMP 1 | temp_in | corroborated | |
| OEM-B-6 | Primary O2 sensor (OX1) | lambda_nb_in | ME442-C1-56 | ANA VOLT 2 | analog_in | corroborated | |
| OEM-B-9 | Sensor ground (E2) | sensor_ground | ME442-C1-52 + ME442-C1-84 | SENSORS GROUND + Sensor Ground | sensor_ground | corroborated | |
| OEM-D-9 | Vehicle speed sensor (SPD) | digital_in | ME442-C1-7 | DIG_IN 2 | 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 | ME442-C1-10 | 0.85 | no route | GROUND CHASSIS | — | |
| W3 | SP-GND-1 | ME442-C1-61 | 0.85 | no route | GROUND | — | |
| W4 | SP-GND-1 | ME442-C1-89 | 0.85 | no route | GROUND | — | |
| W5 | SP-GND-1 | ME442-C1-90 | 0.85 | no route | GROUND | — | |
| W6 | OEM-B-9 | SP-0V-1 | 0.5 | no route | Sensor ground (E2) | — | |
| W7 | SP-0V-1 | ME442-C1-52 | 0.5 | no route | SENSORS GROUND | — | |
| W8 | SP-0V-1 | ME442-C1-84 | 0.5 | no route | Sensor Ground | — | |
| W9 | OEM-A-12 | ME442-C1-63 | 0.5 | no route | Injectors 1 & 4 (No.10) | — | |
| W10 | OEM-A-11 | ME442-C1-4 | 0.5 | no route | Injectors 2 & 6 (No.20) | — | |
| W11 | OEM-A-25 | ME442-C1-33 | 0.5 | no route | Injectors 3 & 5 (No.30) | — | |
| W12 | OEM-B-11 | ME442-C1-26 | 0.5 | no route | Throttle position sensor (VTA) | — | |
| W13 | OEM-B-4 | ME442-C1-86 | 0.5 | no route | Coolant temp (THW) | — | |
| W14 | OEM-B-2 | ME442-C1-6 | 0.5 | no route | Karman-vortex AFM signal (KS) | — | |
| W15 | OEM-B-6 | ME442-C1-56 | 0.5 | no route | Primary O2 sensor (OX1) | — | |
| W16 | OEM-B-3 | ME442-C1-57 | 0.5 | no route | Intake air temp (THA) | — | |
| W17 | OEM-D-9 | ME442-C1-7 | 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 (4)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | INJECTOR_BALLAST | ME442 | The 7M-GTE injectors (7M-GTE fuel injector) are low-impedance, but ME442 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 | ME442-C1-15 | ME442-C1-15 "IGN +12V" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | ME442-C1-64 | ME442-C1-64 "VBAT" 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 (Trigger-pattern list is only inside MEITE software, not published online) 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 - ME442-C1 15: IGN +12V: required by Motorsport Electronics ME442 but no stock pin feeds it; wire by hand - ME442-C1 64: VBAT: required by Motorsport Electronics ME442 but no stock pin feeds it; wire by hand - Fuel-pump control: Motorsport Electronics ME442 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 | Motorsport Electronics GEN2 ME221/ME360/ME442 wire-in pinout | https://motorsport-electronics.co.uk/onlinehelp/html/ME442ME360ME221GEN2Wire-InPinout.html | — | — | — |
| 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/ | — | — | — |