Mazda RX-7 FC 1986-92 (13B-T Turbo II) → Speeduino Speeduino v0.4 (auto)
Mazda RX-7 FC 1986-92 (13B-T Turbo II) — Speeduino — Speeduino
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 2026-10-08
Before you start
| 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 | 38 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-2-R | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | OEM-3-A | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | OEM-3-G | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | SP-GND-1 | SPEEDUINO-A-10 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | SP-GND-1 | SPEEDUINO-A-9 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-1-P | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-1-Q | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | OEM-2-C | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-0V-1 | SPEEDUINO-A-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-0V-1 | SPEEDUINO-A-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-2-A | SPEEDUINO-A-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-1-T | SPEEDUINO-A-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-1-N | SPEEDUINO-A-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-1-U | SPEEDUINO-A-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-1-V | SPEEDUINO-A-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-1-X | SPEEDUINO-A-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-3-E | SPEEDUINO-A-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-3-H | SPEEDUINO-A-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-3-C | SPEEDUINO-A-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-3-F | SPEEDUINO-A-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-1-F | SPEEDUINO-A-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-3-D | SPEEDUINO-A-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-1-C | SPEEDUINO-A-36 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-1-S | SPEEDUINO-A-35 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-2-K | SPEEDUINO-A-37 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-2-M | SPEEDUINO-A-38 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-2-N | SPEEDUINO-A-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-2-O | SPEEDUINO-A-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-2-P | SPEEDUINO-A-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-2-Q | SPEEDUINO-A-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-1-M | SPEEDUINO-A-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-2-B | SPEEDUINO-A-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-2-G | SPEEDUINO-A-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-2-D | SPEEDUINO-A-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-2-I | SPEEDUINO-A-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-2-J | SPEEDUINO-A-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-1-O | SPEEDUINO-A-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-1-E | 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 |
|---|---|---|---|---|---|
| 1 | SPEEDUINO-A-13 | SPEEDUINO-A-10 | open (OL) | 5 V sensor reference must not touch power ground | |
| 2 | SPEEDUINO-A-12 | SPEEDUINO-A-13 | open (OL) | sensor ground must not touch 5 V sensor reference |
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
OEM-1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| C | Air bypass solenoid | — | W23 | — | 0.5 | SPEEDUINO-A-36 | — | — | — |
| E | A/C request | — | W38 | — | 0.5 | SPEEDUINO-A-18 | — | — | — |
| F | A/C clutch relay | — | W21 | — | 0.5 | SPEEDUINO-A-16 | — | — | — |
| G | Neutral switch | — | — | — | — | — | — | — | — |
| H | Water temperature switch | — | — | — | — | — | — | — | — |
| L | Clutch switch | — | — | — | — | — | — | — | — |
| M | Ignition feedback (tacho) | — | W31 | — | 0.5 | SPEEDUINO-A-17 | — | — | — |
| N | CAS 2-tooth (G, cam) | — | W13 | — | 0.5 | SPEEDUINO-A-24 | — | — | — |
| O | Vehicle speed (mileage sensor) | — | W37 | — | 0.5 | SPEEDUINO-A-14 | — | — | — |
| P | CAS ground | — | W6 | — | 0.5 | SP-0V-1 | — | — | — |
| Q | CAS ground | — | W7 | — | 0.5 | SP-0V-1 | — | — | — |
| R | Knock input | — | — | — | — | — | — | — | — |
| S | Port air valve | — | W24 | — | 0.5 | SPEEDUINO-A-35 | — | — | — |
| T | CAS 24-tooth (NE, crank) | — | W12 | — | 0.5 | SPEEDUINO-A-25 | — | — | — |
| U | Ignition select (trailing rotor) | — | W14 | — | 0.5 | SPEEDUINO-A-7 | — | — | — |
| V | Ignition leading | — | W15 | — | 0.5 | SPEEDUINO-A-34 | — | — | — |
| X | Ignition trailing | — | W16 | — | 0.5 | SPEEDUINO-A-33 | — | — | — |
OEM-2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | 5V sensor supply | — | W11 | — | 0.5 | SPEEDUINO-A-13 | — | — | — |
| B | MAP (pressure) signal | — | W32 | — | 0.5 | SPEEDUINO-A-11 | — | — | — |
| C | Sensor ground | — | W8 | — | 0.5 | SP-0V-1 | — | — | — |
| D | O2 sensor signal | — | W34 | — | 0.5 | SPEEDUINO-A-21 | — | — | — |
| E | Airflow signal (AFM) | — | — | — | — | — | — | — | — |
| F | Variable resistor (tuning) | — | — | — | — | — | — | — | — |
| G | Throttle position (TPS) | — | W33 | — | 0.5 | SPEEDUINO-A-22 | — | — | — |
| H | Atmospheric pressure (ATP) | — | — | — | — | — | — | — | — |
| I | Coolant temperature (ECT) | — | W35 | — | 0.5 | SPEEDUINO-A-19 | — | — | — |
| J | Inlet air temperature (IAT) | — | W36 | — | 0.5 | SPEEDUINO-A-20 | — | — | — |
| K | Turbo control valve (boost) | — | W25 | — | 0.5 | SPEEDUINO-A-37 | — | — | — |
| L | Manifold air temperature (MAT) | — | — | — | — | — | — | — | — |
| M | Pressure regulator control valve | — | W26 | — | 0.5 | SPEEDUINO-A-38 | — | — | — |
| N | EGR valve | — | W27 | — | 0.5 | SPEEDUINO-A-31 | — | — | — |
| O | Switching valve | — | W28 | — | 0.5 | SPEEDUINO-A-32 | — | — | — |
| P | Relief valve | — | W29 | — | 0.5 | SPEEDUINO-A-29 | — | — | — |
| Q | Idle control (BAC) | — | W30 | — | 0.5 | SPEEDUINO-A-30 | — | — | — |
| R | Power ground | — | W1 | — | 0.85 | SP-GND-1 | — | — | — |
OEM-3
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Power ground | — | W2 | — | 0.85 | SP-GND-1 | — | — | — |
| B | Starter input | — | — | — | — | — | — | — | — |
| C | Primary injector 2 | — | W19 | — | 0.5 | SPEEDUINO-A-3 | — | — | — |
| D | Starter inhibit / fuel pump control | — | W22 | — | 0.5 | SPEEDUINO-A-15 | — | — | — |
| E | Primary injector 1 | — | W17 | — | 0.5 | SPEEDUINO-A-1 | — | — | — |
| F | Secondary injector 2 | — | W20 | — | 0.5 | SPEEDUINO-A-5 | — | — | — |
| G | Power ground | — | W3 | — | 0.85 | SP-GND-1 | — | — | — |
| H | Secondary injector 1 | — | W18 | — | 0.5 | SPEEDUINO-A-2 | — | — | — |
| I | Ignition power (+12V via main relay) | — | — | — | — | — | — | — | — |
| J | Battery constant (+12V) | — | — | — | — | — | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W6 | — | 0.5 | OEM-1-P | — | — | — |
| 1 | — | — | W7 | — | 0.5 | OEM-1-Q | — | — | — |
| 1 | — | — | W8 | — | 0.5 | OEM-2-C | — | — | — |
| 1 | — | — | W9 | — | 0.5 | SPEEDUINO-A-12 | — | — | — |
| 1 | — | — | W10 | — | 0.5 | SPEEDUINO-A-23 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-2-R | — | — | — |
| 1 | — | — | W2 | — | 0.85 | OEM-3-A | — | — | — |
| 1 | — | — | W3 | — | 0.85 | OEM-3-G | — | — | — |
| 1 | — | — | W4 | — | 0.85 | SPEEDUINO-A-10 | — | — | — |
| 1 | — | — | W5 | — | 0.85 | SPEEDUINO-A-9 | — | — | — |
SPEEDUINO-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injector 1 | — | W17 | — | 0.5 | OEM-3-E | — | — | — |
| 10 | Ground | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| 11 | MAP sensor (0-5V) | — | W32 | — | 0.5 | OEM-2-B | — | — | — |
| 12 | Ground | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| 13 | 5V | — | W11 | — | 0.5 | OEM-2-A | — | — | — |
| 14 | Proto area 1 (flex fuel) | — | W37 | — | 0.5 | OEM-1-O | — | — | — |
| 15 | Proto area 2 (fan) | — | W22 | — | 0.5 | OEM-3-D | — | — | — |
| 16 | Proto area 3 (fuel pump) | — | W21 | — | 0.5 | OEM-1-F | — | — | — |
| 17 | Proto area 4 (tachometer) | — | W31 | — | 0.5 | OEM-1-M | — | — | — |
| 18 | Proto area 5 (clutch) | — | W38 | — | 0.5 | OEM-1-E | — | — | — |
| 19 | Coolant temp (CLT) | — | W35 | — | 0.5 | OEM-2-I | — | — | — |
| 2 | Injector 2 | — | W18 | — | 0.5 | OEM-3-H | — | — | — |
| 20 | Inlet air temp (IAT) | — | W36 | — | 0.5 | OEM-2-J | — | — | — |
| 21 | O2 sensor | — | W34 | — | 0.5 | OEM-2-D | — | — | — |
| 22 | TPS input | — | W33 | — | 0.5 | OEM-2-G | — | — | — |
| 23 | Ground | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| 24 | Cam input / VR2+ | — | W13 | — | 0.5 | OEM-1-N | — | — | — |
| 25 | Crank input / VR1+ | — | W12 | — | 0.5 | OEM-1-T | — | — | — |
| 26 | VR2- | — | — | — | — | — | — | — | — |
| 27 | VR1- | — | — | — | — | — | — | — | — |
| 28 | 5V | — | — | — | — | — | — | — | — |
| 29 | Idle stepper 2B | — | W29 | — | 0.5 | OEM-2-P | — | — | — |
| 3 | Injector 3 | — | W19 | — | 0.5 | OEM-3-C | — | — | — |
| 30 | Idle stepper 2A | — | W30 | — | 0.5 | OEM-2-Q | — | — | — |
| 31 | Idle stepper 1A | — | W27 | — | 0.5 | OEM-2-N | — | — | — |
| 32 | Idle stepper 1B | — | W28 | — | 0.5 | OEM-2-O | — | — | — |
| 33 | Ignition 3 | — | W16 | — | 0.5 | OEM-1-X | — | — | — |
| 34 | Ignition 2 | — | W15 | — | 0.5 | OEM-1-V | — | — | — |
| 35 | Boost | — | W24 | — | 0.5 | OEM-1-S | — | — | — |
| 36 | Idle 2 (3-wire idle) | — | W23 | — | 0.5 | OEM-1-C | — | — | — |
| 37 | PWM idle | — | W25 | — | 0.5 | OEM-2-K | — | — | — |
| 38 | VVT | — | W26 | — | 0.5 | OEM-2-M | — | — | — |
| 5 | Injector 4 | — | W20 | — | 0.5 | OEM-3-F | — | — | — |
| 7 | Ignition 1 | — | W14 | — | 0.5 | OEM-1-U | — | — | — |
| 8 | Ignition 4 | — | — | — | — | — | — | — | — |
| 9 | Ground | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-1-C | Air bypass solenoid | low_side_out | SPEEDUINO-A-36 | Idle 2 (3-wire idle) | low_side_out | single_source | |
| OEM-1-E | A/C request | digital_in | SPEEDUINO-A-18 | Proto area 5 (clutch) | digital_in | single_source | |
| OEM-1-F | A/C clutch relay | low_side_out | SPEEDUINO-A-16 | Proto area 3 (fuel pump) | low_side_out | single_source | |
| OEM-1-G | Neutral switch | digital_in | — | — | — | corroborated | |
| OEM-1-H | Water temperature switch | digital_in | — | — | — | corroborated | |
| OEM-1-L | Clutch switch | digital_in | — | — | — | single_source | |
| OEM-1-M | Ignition feedback (tacho) | tacho_out | SPEEDUINO-A-17 | Proto area 4 (tachometer) | tacho_out | single_source | |
| OEM-1-N | CAS 2-tooth (G, cam) | trigger_in | SPEEDUINO-A-24 | Cam input / VR2+ | trigger_in | corroborated | |
| OEM-1-O | Vehicle speed (mileage sensor) | digital_in | SPEEDUINO-A-14 | Proto area 1 (flex fuel) | digital_in | single_source | |
| OEM-1-P | CAS ground | sensor_ground | SPEEDUINO-A-12 + SPEEDUINO-A-23 | Ground + Ground | sensor_ground | corroborated | |
| OEM-1-Q | CAS ground | sensor_ground | SPEEDUINO-A-12 + SPEEDUINO-A-23 | Ground + Ground | sensor_ground | corroborated | |
| OEM-1-R | Knock input | knock_in | — | — | — | corroborated | |
| OEM-1-S | Port air valve | low_side_out | SPEEDUINO-A-35 | Boost | low_side_out | single_source | |
| OEM-1-T | CAS 24-tooth (NE, crank) | trigger_in | SPEEDUINO-A-25 | Crank input / VR1+ | trigger_in | corroborated | |
| OEM-1-U | Ignition select (trailing rotor) | ignition_out | SPEEDUINO-A-7 | Ignition 1 | ignition_out | corroborated | |
| OEM-1-V | Ignition leading | ignition_out | SPEEDUINO-A-34 | Ignition 2 | ignition_out | corroborated | |
| OEM-1-X | Ignition trailing | ignition_out | SPEEDUINO-A-33 | Ignition 3 | ignition_out | single_source | |
| OEM-2-A | 5V sensor supply | vref | SPEEDUINO-A-13 | 5V | vref | single_source | |
| OEM-2-B | MAP (pressure) signal | analog_in | SPEEDUINO-A-11 | MAP sensor (0-5V) | analog_in | single_source | |
| OEM-2-C | Sensor ground | sensor_ground | SPEEDUINO-A-12 + SPEEDUINO-A-23 | Ground + Ground | sensor_ground | single_source | |
| OEM-2-D | O2 sensor signal | lambda_nb_in | SPEEDUINO-A-21 | O2 sensor | lambda_nb_in | single_source | |
| OEM-2-E | Airflow signal (AFM) | analog_in | — | — | — | single_source | |
| OEM-2-F | Variable resistor (tuning) | analog_in | — | — | — | single_source | |
| OEM-2-G | Throttle position (TPS) | analog_in | SPEEDUINO-A-22 | TPS input | analog_in | single_source | |
| OEM-2-H | Atmospheric pressure (ATP) | analog_in | — | — | — | single_source | |
| OEM-2-I | Coolant temperature (ECT) | temp_in | SPEEDUINO-A-19 | Coolant temp (CLT) | temp_in | single_source | |
| OEM-2-J | Inlet air temperature (IAT) | temp_in | SPEEDUINO-A-20 | Inlet air temp (IAT) | temp_in | single_source | |
| OEM-2-K | Turbo control valve (boost) | low_side_out | SPEEDUINO-A-37 | PWM idle | low_side_out | single_source | |
| OEM-2-L | Manifold air temperature (MAT) | temp_in | — | — | — | single_source | |
| OEM-2-M | Pressure regulator control valve | low_side_out | SPEEDUINO-A-38 | VVT | low_side_out | single_source | |
| OEM-2-N | EGR valve | low_side_out | SPEEDUINO-A-31 | Idle stepper 1A | hbridge_out | single_source | |
| OEM-2-O | Switching valve | low_side_out | SPEEDUINO-A-32 | Idle stepper 1B | hbridge_out | single_source | |
| OEM-2-P | Relief valve | low_side_out | SPEEDUINO-A-29 | Idle stepper 2B | hbridge_out | single_source | |
| OEM-2-Q | Idle control (BAC) | low_side_out | SPEEDUINO-A-30 | Idle stepper 2A | hbridge_out | single_source | |
| OEM-2-R | Power ground | ground | SPEEDUINO-A-10 + SPEEDUINO-A-9 | Ground + Ground | ground | single_source | |
| OEM-3-A | Power ground | ground | SPEEDUINO-A-10 + SPEEDUINO-A-9 | Ground + Ground | ground | single_source | |
| OEM-3-B | Starter input | digital_in | — | — | — | single_source | |
| OEM-3-C | Primary injector 2 | injector_out | SPEEDUINO-A-3 | Injector 3 | injector_out | single_source | |
| OEM-3-D | Starter inhibit / fuel pump control | low_side_out | SPEEDUINO-A-15 | Proto area 2 (fan) | low_side_out | single_source | |
| OEM-3-E | Primary injector 1 | injector_out | SPEEDUINO-A-1 | Injector 1 | injector_out | single_source | |
| OEM-3-F | Secondary injector 2 | injector_out | SPEEDUINO-A-5 | Injector 4 | injector_out | single_source | |
| OEM-3-G | Power ground | ground | SPEEDUINO-A-10 + SPEEDUINO-A-9 | Ground + Ground | ground | single_source | |
| OEM-3-H | Secondary injector 1 | injector_out | SPEEDUINO-A-2 | Injector 2 | injector_out | single_source | |
| OEM-3-I | Ignition power (+12V via main relay) | power_in | — | — | — | single_source | |
| OEM-3-J | Battery constant (+12V) | power_in | — | — | — | single_source |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-2-R | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W2 | OEM-3-A | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W3 | OEM-3-G | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W4 | SP-GND-1 | SPEEDUINO-A-10 | 0.85 | no route | Ground | — | |
| W5 | SP-GND-1 | SPEEDUINO-A-9 | 0.85 | no route | Ground | — | |
| W6 | OEM-1-P | SP-0V-1 | 0.5 | no route | CAS ground | — | |
| W7 | OEM-1-Q | SP-0V-1 | 0.5 | no route | CAS ground | — | |
| W8 | OEM-2-C | SP-0V-1 | 0.5 | no route | Sensor ground | — | |
| W9 | SP-0V-1 | SPEEDUINO-A-12 | 0.5 | no route | Ground | — | |
| W10 | SP-0V-1 | SPEEDUINO-A-23 | 0.5 | no route | Ground | — | |
| W11 | OEM-2-A | SPEEDUINO-A-13 | 0.5 | no route | 5V sensor supply | — | |
| W12 | OEM-1-T | SPEEDUINO-A-25 | 0.5 | no route | CAS 24-tooth (NE, crank) | — | |
| W13 | OEM-1-N | SPEEDUINO-A-24 | 0.5 | no route | CAS 2-tooth (G, cam) | — | |
| W14 | OEM-1-U | SPEEDUINO-A-7 | 0.5 | no route | Ignition select (trailing rotor) | — | |
| W15 | OEM-1-V | SPEEDUINO-A-34 | 0.5 | no route | Ignition leading | — | |
| W16 | OEM-1-X | SPEEDUINO-A-33 | 0.5 | no route | Ignition trailing | — | |
| W17 | OEM-3-E | SPEEDUINO-A-1 | 0.5 | no route | Primary injector 1 | — | |
| W18 | OEM-3-H | SPEEDUINO-A-2 | 0.5 | no route | Secondary injector 1 | — | |
| W19 | OEM-3-C | SPEEDUINO-A-3 | 0.5 | no route | Primary injector 2 | — | |
| W20 | OEM-3-F | SPEEDUINO-A-5 | 0.5 | no route | Secondary injector 2 | — | |
| W21 | OEM-1-F | SPEEDUINO-A-16 | 0.5 | no route | A/C clutch relay | — | |
| W22 | OEM-3-D | SPEEDUINO-A-15 | 0.5 | no route | Starter inhibit / fuel pump control | — | |
| W23 | OEM-1-C | SPEEDUINO-A-36 | 0.5 | no route | Air bypass solenoid | — | |
| W24 | OEM-1-S | SPEEDUINO-A-35 | 0.5 | no route | Port air valve | — | |
| W25 | OEM-2-K | SPEEDUINO-A-37 | 0.5 | no route | Turbo control valve (boost) | — | |
| W26 | OEM-2-M | SPEEDUINO-A-38 | 0.5 | no route | Pressure regulator control valve | — | |
| W27 | OEM-2-N | SPEEDUINO-A-31 | 0.5 | no route | EGR valve | — | |
| W28 | OEM-2-O | SPEEDUINO-A-32 | 0.5 | no route | Switching valve | — | |
| W29 | OEM-2-P | SPEEDUINO-A-29 | 0.5 | no route | Relief valve | — | |
| W30 | OEM-2-Q | SPEEDUINO-A-30 | 0.5 | no route | Idle control (BAC) | — | |
| W31 | OEM-1-M | SPEEDUINO-A-17 | 0.5 | no route | Ignition feedback (tacho) | — | |
| W32 | OEM-2-B | SPEEDUINO-A-11 | 0.5 | no route | MAP (pressure) signal | — | |
| W33 | OEM-2-G | SPEEDUINO-A-22 | 0.5 | no route | Throttle position (TPS) | — | |
| W34 | OEM-2-D | SPEEDUINO-A-21 | 0.5 | no route | O2 sensor signal | — | |
| W35 | OEM-2-I | SPEEDUINO-A-19 | 0.5 | no route | Coolant temperature (ECT) | — | |
| W36 | OEM-2-J | SPEEDUINO-A-20 | 0.5 | no route | Inlet air temperature (IAT) | — | |
| W37 | OEM-1-O | SPEEDUINO-A-14 | 0.5 | no route | Vehicle speed (mileage sensor) | — | |
| W38 | OEM-1-E | SPEEDUINO-A-18 | 0.5 | no route | A/C request | — |
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 (8)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | REQUIRED_UNMAPPED | OEM-2-E | Required OEM function "Airflow signal (AFM)" (analog_in) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-3-I | Required OEM function "Ignition power (+12V via main relay)" (power_in) is not connected to the new ECU. |
| warn | LOAD_UNKNOWN | SPEEDUINO-A-16 | SPEEDUINO-A-16 "Proto area 3 (fuel pump)" drives OEM-1-F A/C clutch relay (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | NET_FAMILY | OEM-2-N ↔ SPEEDUINO-A-31 | OEM-2-N "EGR valve" [low_side_out] is wired to SPEEDUINO-A-31 "Idle stepper 1A" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way. |
| warn | NET_FAMILY | OEM-2-O ↔ SPEEDUINO-A-32 | OEM-2-O "Switching valve" [low_side_out] is wired to SPEEDUINO-A-32 "Idle stepper 1B" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way. |
| warn | NET_FAMILY | OEM-2-P ↔ SPEEDUINO-A-29 | OEM-2-P "Relief valve" [low_side_out] is wired to SPEEDUINO-A-29 "Idle stepper 2B" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way. |
| warn | NET_FAMILY | OEM-2-Q ↔ SPEEDUINO-A-30 | OEM-2-Q "Idle control (BAC)" [low_side_out] is wired to SPEEDUINO-A-30 "Idle stepper 2A" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way. |
| info | UNMAPPED | OEM | 8 optional OEM pins are not mapped: OEM-1-G Neutral switch; OEM-1-H Water temperature switch; OEM-1-L Clutch switch; OEM-1-R Knock input; OEM-2-F Variable resistor (tuning); OEM-2-H Atmospheric pressure (ATP); OEM-2-L Manifold air temperature (MAT); OEM-3-B Starter input |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-3-J | Battery-constant (memory) feed of the stock ECU: the new ECU has no such input, so it is not needed. | mapping-proposal |
Notes
Auto-mapped by auto_map() from the library pin data on 2026-10-06. 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 - OEM-2 E: Airflow signal (AFM): no free maf/analog_0_5 on Speeduino Speeduino - OEM-3 I: Ignition power (+12V via main relay): no rule for class ecu_main_power; wire by hand Not wired: - OEM-3 J: Battery constant (+12V): Speeduino Speeduino has no battery-constant input; not needed - OEM-1 R: Knock input: no free knock input on Speeduino Speeduino - OEM-2 L: Manifold air temperature (MAT): no free thermistor/analog_0_5 on Speeduino Speeduino - OEM-2 F: Variable resistor (tuning): no free analog_0_5 on Speeduino Speeduino - OEM-2 H: Atmospheric pressure (ATP): no free analog_0_5 on Speeduino Speeduino - OEM-1 G: Neutral switch: no free switch_in/frequency_in/analog_0_5 on Speeduino Speeduino - OEM-1 H: Water temperature switch: no free switch_in/frequency_in/analog_0_5 on Speeduino Speeduino - OEM-1 L: Clutch switch: no free switch_in/frequency_in/analog_0_5 on Speeduino Speeduino - OEM-3 B: Starter input: no free switch_in/frequency_in/analog_0_5 on Speeduino Speeduino
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | Adaptronic: Select RX7 Series 4 FC Turbo plug-in pinout | https://www.rx7club.com/attachments/adaptronic-engine-mgmt-aus-311/543323d1411579751-need-pin-out-diagram-s5-pnp-rx7_s4_sel_pinout.pdf | — | — | — |
| 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 |
| 2 | forum | MSExtra: FC3S CAS wiring (NE/G) | https://www.msextra.com/forums/viewtopic.php?p=279694 | — | — | — |
| 2 | forum | NoPistons: S4 Turbo II main harness wiring (ECU plug, colours only) | https://www.nopistons.com/1st-generation-specific-16/thinking-putting-89-13bt-sa22-66354/page2/ | — | — | — |