Toyota Supra A70 1986-92 (7M-GTE) → MoTeC M170 13170 (auto)
Toyota Supra A70 1986-92 (7M-GTE) — MoTeC — M170
⚠ 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 | 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 | M170-A-14 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-GND-1 | M170-A-15 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | SP-GND-1 | M170-A-19 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | SP-GND-1 | M170-A-20 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | SP-GND-1 | M170-A-21 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-B-9 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-0V-1 | M170-A-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-0V-1 | M170-A-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-A-12 | M170-A-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-A-11 | M170-A-43 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-A-25 | M170-A-50 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-B-11 | M170-A-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-B-4 | M170-A-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-B-2 | M170-A-49 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-B-6 | M170-A-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-B-3 | M170-A-38 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-D-9 | M170-A-56 | 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
M170-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Low Side Ignition 1 | — | — | — | — | — | — | — | — |
| 10 | Low Side Ignition 4 | — | — | — | — | — | — | — | — |
| 11 | Sensor 0V A | — | W8 | — | 0.5 | SP-0V-1 | — | — | — |
| 12 | Analogue Voltage Input 5 | — | — | — | — | — | — | — | — |
| 13 | Universal Digital Input 7 | — | — | — | — | — | — | — | — |
| 14 | Battery Negative 1 | — | W2 | — | 0.85 | SP-GND-1 | — | — | — |
| 15 | Battery Negative 2 | — | W3 | — | 0.85 | SP-GND-1 | — | — | — |
| 16 | Sensor 5.0V A | — | — | — | — | — | — | — | — |
| 17 | Low Side Ignition 5 | — | — | — | — | — | — | — | — |
| 18 | Analogue Voltage Input 2 | — | W16 | — | 0.5 | OEM-B-6 | — | — | — |
| 19 | Battery Negative 3 | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| 2 | Low Side Ignition 8 | — | — | — | — | — | — | — | — |
| 20 | Battery Negative 4 | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 21 | Battery Negative 5 | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 22 | Universal Digital Input 8 | — | — | — | — | — | — | — | — |
| 23 | Battery Positive | — | — | — | — | — | — | — | — |
| 24 | Peak Hold Injector 5 | — | — | — | — | — | — | — | — |
| 25 | Low Side Ignition 6 | — | — | — | — | — | — | — | — |
| 26 | Analogue Voltage Input 1 | — | W13 | — | 0.5 | OEM-B-11 | — | — | — |
| 27 | Sensor 0V B | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| 28 | Analogue Temperature Input 1 | — | W14 | — | 0.5 | OEM-B-4 | — | — | — |
| 29 | Knock Input 1 | — | — | — | — | — | — | — | — |
| 3 | Low Side Ignition 7 | — | — | — | — | — | — | — | — |
| 30 | Analogue Temperature Input 3 | — | — | — | — | — | — | — | — |
| 31 | CAN Bus 1 Low | — | — | — | — | — | — | — | — |
| 32 | Battery Positive | — | — | — | — | — | — | — | — |
| 33 | Peak Hold Injector 1 | — | W10 | — | 0.5 | OEM-A-12 | — | — | — |
| 34 | Sensor 5.0V B | — | — | — | — | — | — | — | — |
| 35 | Analogue Voltage Input 7 | — | — | — | — | — | — | — | — |
| 36 | Analogue Voltage Input 6 | — | — | — | — | — | — | — | — |
| 37 | Sensor 6.3V | — | — | — | — | — | — | — | — |
| 38 | Analogue Temperature Input 2 | — | W17 | — | 0.5 | OEM-B-3 | — | — | — |
| 39 | Analogue Temperature Input 4 | — | — | — | — | — | — | — | — |
| 4 | Low Side Ignition 3 | — | — | — | — | — | — | — | — |
| 40 | CAN Bus 1 High | — | — | — | — | — | — | — | — |
| 41 | Battery Positive | — | — | — | — | — | — | — | — |
| 42 | Peak Hold Injector 6 | — | — | — | — | — | — | — | — |
| 43 | Low Side Injector 1 | — | W11 | — | 0.5 | OEM-A-11 | — | — | — |
| 44 | Analogue Voltage Input 8 | — | — | — | — | — | — | — | — |
| 45 | Universal Digital Input 4 | — | — | — | — | — | — | — | — |
| 46 | Universal Digital Input 3 | — | — | — | — | — | — | — | — |
| 47 | Ethernet Transmit - | — | — | — | — | — | — | — | — |
| 48 | Ethernet Transmit + | — | — | — | — | — | — | — | — |
| 49 | Universal Digital Input 1 | — | W15 | — | 0.5 | OEM-B-2 | — | — | — |
| 5 | Low Side Ignition 2 | — | — | — | — | — | — | — | — |
| 50 | Peak Hold Injector 2 | — | W12 | — | 0.5 | OEM-A-25 | — | — | — |
| 51 | Low Side Injector 2 | — | — | — | — | — | — | — | — |
| 52 | Universal Digital Input 5 | — | — | — | — | — | — | — | — |
| 53 | Universal Digital Input 6 | — | — | — | — | — | — | — | — |
| 54 | Battery Backup | — | — | — | — | — | — | — | — |
| 55 | Ethernet Receive + | — | — | — | — | — | — | — | — |
| 56 | Universal Digital Input 2 | — | W18 | — | 0.5 | OEM-D-9 | — | — | — |
| 57 | Peak Hold Injector 7 | — | — | — | — | — | — | — | — |
| 58 | Half Bridge Output 5 | — | — | — | — | — | — | — | — |
| 59 | Half Bridge Output 3 | — | — | — | — | — | — | — | — |
| 6 | Analogue Voltage Input 3 | — | — | — | — | — | — | — | — |
| 60 | Knock Input 2 | — | — | — | — | — | — | — | — |
| 61 | Ethernet Receive - | — | — | — | — | — | — | — | — |
| 62 | Peak Hold Injector 8 | — | — | — | — | — | — | — | — |
| 63 | Peak Hold Injector 3 | — | — | — | — | — | — | — | — |
| 64 | Half Bridge Output 6 | — | — | — | — | — | — | — | — |
| 65 | Half Bridge Output 4 | — | — | — | — | — | — | — | — |
| 66 | Peak Hold Injector 4 | — | — | — | — | — | — | — | — |
| 7 | Analogue Voltage Input 4 | — | — | — | — | — | — | — | — |
| 8 | Half Bridge Output 2 | — | — | — | — | — | — | — | — |
| 9 | Half Bridge Output 1 | — | — | — | — | — | — | — | — |
OEM-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 11 | Injectors 2 & 6 (No.20) | — | W11 | — | 0.5 | M170-A-43 | — | — | — |
| 12 | Injectors 1 & 4 (No.10) | — | W10 | — | 0.5 | M170-A-33 | — | — | — |
| 25 | Injectors 3 & 5 (No.30) | — | W12 | — | 0.5 | M170-A-50 | — | — | — |
| 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 | M170-A-26 | — | — | — |
| 2 | Karman-vortex AFM signal (KS) | — | W15 | — | 0.5 | M170-A-49 | — | — | — |
| 3 | Intake air temp (THA) | — | W17 | — | 0.5 | M170-A-38 | — | — | — |
| 4 | Coolant temp (THW) | — | W14 | — | 0.5 | M170-A-28 | — | — | — |
| 6 | Primary O2 sensor (OX1) | — | W16 | — | 0.5 | M170-A-18 | — | — | — |
| 9 | Sensor ground (E2) | — | W7 | — | 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 | M170-A-56 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W7 | — | 0.5 | OEM-B-9 | — | — | — |
| 1 | — | — | W8 | — | 0.5 | M170-A-11 | — | — | — |
| 1 | — | — | W9 | — | 0.5 | M170-A-27 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-A-26 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | M170-A-14 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | M170-A-15 | — | — | — |
| 1 | — | — | W4 | — | 0.85 | M170-A-19 | — | — | — |
| 1 | — | — | W5 | — | 0.85 | M170-A-20 | — | — | — |
| 1 | — | — | W6 | — | 0.85 | M170-A-21 | — | — | — |
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 | M170-A-43 | Low Side Injector 1 | injector_out | corroborated | |
| OEM-A-12 | Injectors 1 & 4 (No.10) | injector_out | M170-A-33 | Peak Hold Injector 1 | injector_out | corroborated | |
| OEM-A-25 | Injectors 3 & 5 (No.30) | injector_out | M170-A-50 | Peak Hold Injector 2 | injector_out | corroborated | |
| OEM-A-26 | Power ground (E01/E02) | ground | M170-A-14 + M170-A-15 + M170-A-19 + M170-A-20 + M170-A-21 | Battery Negative 1 + Battery Negative 2 + Battery Negative 3 + Battery Negative 4 + Battery Negative 5 | ground | corroborated | |
| OEM-B-11 | Throttle position sensor (VTA) | analog_in | M170-A-26 | Analogue Voltage Input 1 | analog_in | corroborated | |
| OEM-B-2 | Karman-vortex AFM signal (KS) | digital_in | M170-A-49 | Universal Digital Input 1 | digital_in | corroborated | |
| OEM-B-3 | Intake air temp (THA) | temp_in | M170-A-38 | Analogue Temperature Input 2 | temp_in | corroborated | |
| OEM-B-4 | Coolant temp (THW) | temp_in | M170-A-28 | Analogue Temperature Input 1 | temp_in | corroborated | |
| OEM-B-6 | Primary O2 sensor (OX1) | lambda_nb_in | M170-A-18 | Analogue Voltage Input 2 | analog_in | corroborated | |
| OEM-B-9 | Sensor ground (E2) | sensor_ground | M170-A-11 + M170-A-27 | Sensor 0V A + Sensor 0V B | sensor_ground | corroborated | |
| OEM-D-9 | Vehicle speed sensor (SPD) | digital_in | M170-A-56 | Universal Digital Input 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 | M170-A-14 | 0.85 | no route | Battery Negative 1 | — | |
| W3 | SP-GND-1 | M170-A-15 | 0.85 | no route | Battery Negative 2 | — | |
| W4 | SP-GND-1 | M170-A-19 | 0.85 | no route | Battery Negative 3 | — | |
| W5 | SP-GND-1 | M170-A-20 | 0.85 | no route | Battery Negative 4 | — | |
| W6 | SP-GND-1 | M170-A-21 | 0.85 | no route | Battery Negative 5 | — | |
| W7 | OEM-B-9 | SP-0V-1 | 0.5 | no route | Sensor ground (E2) | — | |
| W8 | SP-0V-1 | M170-A-11 | 0.5 | no route | Sensor 0V A | — | |
| W9 | SP-0V-1 | M170-A-27 | 0.5 | no route | Sensor 0V B | — | |
| W10 | OEM-A-12 | M170-A-33 | 0.5 | no route | Injectors 1 & 4 (No.10) | — | |
| W11 | OEM-A-11 | M170-A-43 | 0.5 | no route | Injectors 2 & 6 (No.20) | — | |
| W12 | OEM-A-25 | M170-A-50 | 0.5 | no route | Injectors 3 & 5 (No.30) | — | |
| W13 | OEM-B-11 | M170-A-26 | 0.5 | no route | Throttle position sensor (VTA) | — | |
| W14 | OEM-B-4 | M170-A-28 | 0.5 | no route | Coolant temp (THW) | — | |
| W15 | OEM-B-2 | M170-A-49 | 0.5 | no route | Karman-vortex AFM signal (KS) | — | |
| W16 | OEM-B-6 | M170-A-18 | 0.5 | no route | Primary O2 sensor (OX1) | — | |
| W17 | OEM-B-3 | M170-A-38 | 0.5 | no route | Intake air temp (THA) | — | |
| W18 | OEM-D-9 | M170-A-56 | 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 | PHYS_REQUIRED_OPEN | M170-A-23 | M170-A-23 "Battery Positive" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | M170-A-32 | M170-A-32 "Battery Positive" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | M170-A-41 | M170-A-41 "Battery Positive" 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 sync mode) 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 - M170-A 23: Battery Positive: required by MoTeC M170 but no stock pin feeds it; wire by hand - M170-A 32: Battery Positive: required by MoTeC M170 but no stock pin feeds it; wire by hand - M170-A 41: Battery Positive: required by MoTeC M170 but no stock pin feeds it; wire by hand - Fuel-pump control: MoTeC M170 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 | MoTeC: M1 ECU Hardware manual (7 Nov 2013) — M130/M150/M170/M190 pinout tables | https://web.archive.org/web/2023id_/https://www.motec.com.au/hessian/uploads/M1_ECU_Hardware_c2517380e4.pdf | — | 2026-10-05 | 03dc5975f739 |
| 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/ | — | — | — |