Mazda RX-7 FC 1986-92 (13B-T Turbo II) → Emtron SL8 (auto)
Mazda RX-7 FC 1986-92 (13B-T Turbo II) — Emtron — SL8
⚠ 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 | none |
| Size of the job | 50 wires · 8 connectors · 3 part lines |
| Tools | Crimp and extraction tools for each terminal family (see Connectors) · wire strippers · multimeter · heat gun + heat-shrink |
| Terminals | 3-1447221-4 |
| 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-3-I | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | SP-14V-1 | SL8-A-34 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-14V-1 | SL8-B-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-2-R | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-3-A | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-3-G | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | SP-GND-1 | SL8-B-18 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | SL8-B-26 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-1-P | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-1-Q | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-2-C | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | SP-0V-1 | SL8-B-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-2-A | SL8-B-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-1-T | SL8-B-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | SP-0V-1 | SL8-B-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-1-N | SL8-B-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | SP-0V-1 | SL8-B-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-1-R | SL8-B-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-1-U | SL8-A-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-1-V | SL8-A-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-1-X | SL8-A-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-3-E | SL8-A-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-3-H | SL8-A-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-3-C | SL8-A-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-3-F | SL8-A-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-1-F | SL8-B-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-3-D | SL8-A-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-1-C | SL8-A-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-1-S | SL8-A-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-2-K | SL8-A-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-2-M | SL8-A-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-2-N | SL8-A-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-2-O | SL8-A-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-2-P | SL8-A-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-2-Q | SL8-A-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-2-E | SL8-B-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-2-B | SL8-B-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-2-G | SL8-B-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-2-D | SL8-B-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-2-I | SL8-B-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-2-J | SL8-B-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-2-L | SL8-B-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-2-F | SL8-B-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-2-H | SL8-B-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-1-O | SL8-A-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-1-E | SL8-A-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-1-G | SL8-A-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | OEM-1-H | SL8-A-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W49 | OEM-1-L | SL8-A-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W50 | OEM-3-B | SL8-A-25 | 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 | SL8-B-2 | SL8-B-18 | open (OL) | 5 V sensor reference must not touch power ground | |
| 2 | SL8-B-10 | SL8-A-34 | open (OL) | sensor ground must not touch +12 V supply | |
| 3 | SL8-B-10 | SL8-B-2 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 4 | SL8-B-18 | SL8-A-34 | open (OL) | power ground must not touch +12 V supply | |
| 5 | SL8-B-2 | SL8-A-34 | open (OL) | 5 V sensor reference must not touch +12 V supply |
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 | — | W28 | — | 0.5 | SL8-A-15 | — | — | — |
| E | A/C request | — | W46 | — | 0.5 | SL8-A-21 | — | — | — |
| F | A/C clutch relay | — | W26 | — | 0.5 | SL8-B-3 | — | — | — |
| G | Neutral switch | — | W47 | — | 0.5 | SL8-A-22 | — | — | — |
| H | Water temperature switch | — | W48 | — | 0.5 | SL8-A-23 | — | — | — |
| L | Clutch switch | — | W49 | — | 0.5 | SL8-A-24 | — | — | — |
| M | Ignition feedback (tacho) | — | — | — | — | — | — | — | — |
| N | CAS 2-tooth (G, cam) | — | W16 | — | 0.5 | SL8-B-7 | — | — | — |
| O | Vehicle speed (mileage sensor) | — | W45 | — | 0.5 | SL8-A-20 | — | — | — |
| P | CAS ground | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| Q | CAS ground | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| R | Knock input | — | W18 | — | 0.5 | SL8-B-16 | — | — | — |
| S | Port air valve | — | W29 | — | 0.5 | SL8-A-16 | — | — | — |
| T | CAS 24-tooth (NE, crank) | — | W14 | — | 0.5 | SL8-B-5 | — | — | — |
| U | Ignition select (trailing rotor) | — | W19 | — | 0.5 | SL8-A-26 | — | — | — |
| V | Ignition leading | — | W20 | — | 0.5 | SL8-A-27 | — | — | — |
| X | Ignition trailing | — | W21 | — | 0.5 | SL8-A-28 | — | — | — |
OEM-2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | 5V sensor supply | — | W13 | — | 0.5 | SL8-B-2 | — | — | — |
| B | MAP (pressure) signal | — | W37 | — | 0.5 | SL8-B-12 | — | — | — |
| C | Sensor ground | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| D | O2 sensor signal | — | W39 | — | 0.5 | SL8-B-14 | — | — | — |
| E | Airflow signal (AFM) | — | W36 | — | 0.5 | SL8-B-11 | — | — | — |
| F | Variable resistor (tuning) | — | W43 | — | 0.5 | SL8-B-21 | — | — | — |
| G | Throttle position (TPS) | — | W38 | — | 0.5 | SL8-B-13 | — | — | — |
| H | Atmospheric pressure (ATP) | — | W44 | — | 0.5 | SL8-B-22 | — | — | — |
| I | Coolant temperature (ECT) | — | W40 | — | 0.5 | SL8-B-15 | — | — | — |
| J | Inlet air temperature (IAT) | — | W41 | — | 0.5 | SL8-B-19 | — | — | — |
| K | Turbo control valve (boost) | — | W30 | — | 0.5 | SL8-A-17 | — | — | — |
| L | Manifold air temperature (MAT) | — | W42 | — | 0.5 | SL8-B-20 | — | — | — |
| M | Pressure regulator control valve | — | W31 | — | 0.5 | SL8-A-10 | — | — | — |
| N | EGR valve | — | W32 | — | 0.5 | SL8-A-11 | — | — | — |
| O | Switching valve | — | W33 | — | 0.5 | SL8-A-12 | — | — | — |
| P | Relief valve | — | W34 | — | 0.5 | SL8-A-13 | — | — | — |
| Q | Idle control (BAC) | — | W35 | — | 0.5 | SL8-A-5 | — | — | — |
| R | Power ground | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
OEM-3
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Power ground | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| B | Starter input | — | W50 | — | 0.5 | SL8-A-25 | — | — | — |
| C | Primary injector 2 | — | W24 | — | 0.5 | SL8-A-3 | — | — | — |
| D | Starter inhibit / fuel pump control | — | W27 | — | 0.5 | SL8-A-14 | — | — | — |
| E | Primary injector 1 | — | W22 | — | 0.5 | SL8-A-1 | — | — | — |
| F | Secondary injector 2 | — | W25 | — | 0.5 | SL8-A-4 | — | — | — |
| G | Power ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| H | Secondary injector 1 | — | W23 | — | 0.5 | SL8-A-2 | — | — | — |
| I | Ignition power (+12V via main relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| J | Battery constant (+12V) | — | — | — | — | — | — | — | — |
SL8-A
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injection channel 1 | — | W22 | — | 0.5 | OEM-3-E | — | — | — |
| 2 | Injection channel 2 | — | W23 | — | 0.5 | OEM-3-H | — | — | — |
| 3 | Injection channel 3 | — | W24 | — | 0.5 | OEM-3-C | — | — | — |
| 4 | Injection channel 4 | — | W25 | — | 0.5 | OEM-3-F | — | — | — |
| 5 | Injection channel 5 | — | W35 | — | 0.5 | OEM-2-Q | — | — | — |
| 6 | Injection channel 6 | — | — | — | — | — | — | — | — |
| 7 | Injection channel 7 | — | — | — | — | — | — | — | — |
| 8 | Injection channel 8 | — | — | — | — | — | — | — | — |
| 9 | Sensor supply 8V | — | — | — | — | — | — | — | — |
| 10 | Auxiliary output 1 | — | W31 | — | 0.5 | OEM-2-M | — | — | — |
| 11 | Auxiliary output 2 | — | W32 | — | 0.5 | OEM-2-N | — | — | — |
| 12 | Auxiliary output 3 | — | W33 | — | 0.5 | OEM-2-O | — | — | — |
| 13 | Auxiliary output 4 | — | W34 | — | 0.5 | OEM-2-P | — | — | — |
| 14 | Auxiliary output 5 | — | W27 | — | 0.5 | OEM-3-D | — | — | — |
| 15 | Auxiliary output 6 | — | W28 | — | 0.5 | OEM-1-C | — | — | — |
| 16 | Auxiliary output 7 | — | W29 | — | 0.5 | OEM-1-S | — | — | — |
| 17 | Auxiliary output 8 | — | W30 | — | 0.5 | OEM-2-K | — | — | — |
| 18 | Auxiliary output 9 | — | — | — | — | — | — | — | — |
| 19 | Auxiliary output 10 | — | — | — | — | — | — | — | — |
| 20 | Digital input 1 | — | W45 | — | 0.5 | OEM-1-O | — | — | — |
| 21 | Digital input 2 | — | W46 | — | 0.5 | OEM-1-E | — | — | — |
| 22 | Digital input 3 | — | W47 | — | 0.5 | OEM-1-G | — | — | — |
| 23 | Digital input 4 | — | W48 | — | 0.5 | OEM-1-H | — | — | — |
| 24 | Digital input 5 | — | W49 | — | 0.5 | OEM-1-L | — | — | — |
| 25 | Digital input 6 | — | W50 | — | 0.5 | OEM-3-B | — | — | — |
| 26 | Ignition channel 1 | — | W19 | — | 0.5 | OEM-1-U | — | — | — |
| 27 | Ignition channel 2 | — | W20 | — | 0.5 | OEM-1-V | — | — | — |
| 28 | Ignition channel 3 | — | W21 | — | 0.5 | OEM-1-X | — | — | — |
| 29 | Ignition channel 4 | — | — | — | — | — | — | — | — |
| 30 | Ignition channel 5 | — | — | — | — | — | — | — | — |
| 31 | Ignition channel 6 | — | — | — | — | — | — | — | — |
| 32 | Ignition channel 7 | — | — | — | — | — | — | — | — |
| 33 | Ignition channel 8 | — | — | — | — | — | — | — | — |
| 34 | Aux 9–10 14V supply | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
SL8-B
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | ECU 14V supply | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 2 | Sensor supply Vref1 5.0V | — | W13 | — | 0.5 | OEM-2-A | — | — | — |
| 3 | EFI relay output (low side, 200 mA) | — | W26 | — | 0.5 | OEM-1-F | — | — | — |
| 4 | Ignition switch input | — | — | — | — | — | — | — | — |
| 5 | Crank index sensor + | — | W14 | — | 0.5 | OEM-1-T | — | — | — |
| 6 | Crank index sensor − | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 7 | Sync sensor + | — | W16 | — | 0.5 | OEM-1-N | — | — | — |
| 8 | Sync sensor − | — | W17 | — | 0.5 | SP-0V-1 | — | — | — |
| 9 | Shield (crank/sync/knock) | — | — | — | — | — | — | — | — |
| 10 | Analog sensor 0V reference | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 11 | Analog input 1 | — | W36 | — | 0.5 | OEM-2-E | — | — | — |
| 12 | Analog input 2 | — | W37 | — | 0.5 | OEM-2-B | — | — | — |
| 13 | Analog input 3 | — | W38 | — | 0.5 | OEM-2-G | — | — | — |
| 14 | Analog input 4 | — | W39 | — | 0.5 | OEM-2-D | — | — | — |
| 15 | Analog input 5 | — | W40 | — | 0.5 | OEM-2-I | — | — | — |
| 16 | Knock 1 + | — | W18 | — | 0.5 | OEM-1-R | — | — | — |
| 17 | Knock 1 − | — | — | — | — | — | — | — | — |
| 18 | ECU ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 19 | Analog input 6 | — | W41 | — | 0.5 | OEM-2-J | — | — | — |
| 20 | Analog input 7 (switchable 1k pull-up) | — | W42 | — | 0.5 | OEM-2-L | — | — | — |
| 21 | Analog input 8 (switchable 1k pull-up) | — | W43 | — | 0.5 | OEM-2-F | — | — | — |
| 22 | Analog input 9 (switchable 1k pull-up) | — | W44 | — | 0.5 | OEM-2-H | — | — | — |
| 23 | Analog input 10 (switchable 1k pull-up) | — | — | — | — | — | — | — | — |
| 24 | Knock 2 + | — | — | — | — | — | — | — | — |
| 25 | Knock 2 − | — | — | — | — | — | — | — | — |
| 26 | ECU ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 27 | CAN 1 H | — | — | — | — | — | — | — | — |
| 28 | CAN 1 L | — | — | — | — | — | — | — | — |
| 29 | NC | — | — | — | — | — | — | — | — |
| 30 | NC | — | — | — | — | — | — | — | — |
| 31 | Ethernet Tx + | — | — | — | — | — | — | — | — |
| 32 | Ethernet Tx − | — | — | — | — | — | — | — | — |
| 33 | Ethernet Rx + | — | — | — | — | — | — | — | — |
| 34 | Ethernet Rx − | — | — | — | — | — | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W9 | — | 0.5 | OEM-1-P | — | — | — |
| 1 | — | — | W10 | — | 0.5 | OEM-1-Q | — | — | — |
| 1 | — | — | W11 | — | 0.5 | OEM-2-C | — | — | — |
| 1 | — | — | W12 | — | 0.5 | SL8-B-10 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | SL8-B-6 | — | — | — |
| 1 | — | — | W17 | — | 0.5 | SL8-B-8 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-3-I | — | — | — |
| 1 | — | — | W2 | — | 0.85 | SL8-A-34 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | SL8-B-1 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W4 | — | 0.85 | OEM-2-R | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-3-A | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-3-G | — | — | — |
| 1 | — | — | W7 | — | 0.85 | SL8-B-18 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | SL8-B-26 | — | — | — |
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 | SL8-A-15 | Auxiliary output 6 | switch_out | single_source | |
| OEM-1-E | A/C request | digital_in | SL8-A-21 | Digital input 2 | digital_in | single_source | |
| OEM-1-F | A/C clutch relay | low_side_out | SL8-B-3 | EFI relay output (low side, 200 mA) | low_side_out | single_source | |
| OEM-1-G | Neutral switch | digital_in | SL8-A-22 | Digital input 3 | digital_in | corroborated | |
| OEM-1-H | Water temperature switch | digital_in | SL8-A-23 | Digital input 4 | digital_in | corroborated | |
| OEM-1-L | Clutch switch | digital_in | SL8-A-24 | Digital input 5 | digital_in | single_source | |
| OEM-1-M | Ignition feedback (tacho) | tacho_out | — | — | — | single_source | |
| OEM-1-N | CAS 2-tooth (G, cam) | trigger_in | SL8-B-7 | Sync sensor + | trigger_in | corroborated | |
| OEM-1-O | Vehicle speed (mileage sensor) | digital_in | SL8-A-20 | Digital input 1 | digital_in | single_source | |
| OEM-1-P | CAS ground | sensor_ground | SL8-B-10 + SL8-B-6 + SL8-B-8 | Analog sensor 0V reference + Crank index sensor − + Sync sensor − | sensor_ground + trigger_in | corroborated | |
| OEM-1-Q | CAS ground | sensor_ground | SL8-B-10 + SL8-B-6 + SL8-B-8 | Analog sensor 0V reference + Crank index sensor − + Sync sensor − | sensor_ground + trigger_in | corroborated | |
| OEM-1-R | Knock input | knock_in | SL8-B-16 | Knock 1 + | knock_in | corroborated | |
| OEM-1-S | Port air valve | low_side_out | SL8-A-16 | Auxiliary output 7 | switch_out | single_source | |
| OEM-1-T | CAS 24-tooth (NE, crank) | trigger_in | SL8-B-5 | Crank index sensor + | trigger_in | corroborated | |
| OEM-1-U | Ignition select (trailing rotor) | ignition_out | SL8-A-26 | Ignition channel 1 | ignition_out | corroborated | |
| OEM-1-V | Ignition leading | ignition_out | SL8-A-27 | Ignition channel 2 | ignition_out | corroborated | |
| OEM-1-X | Ignition trailing | ignition_out | SL8-A-28 | Ignition channel 3 | ignition_out | single_source | |
| OEM-2-A | 5V sensor supply | vref | SL8-B-2 | Sensor supply Vref1 5.0V | vref | single_source | |
| OEM-2-B | MAP (pressure) signal | analog_in | SL8-B-12 | Analog input 2 | analog_in | single_source | |
| OEM-2-C | Sensor ground | sensor_ground | SL8-B-10 + SL8-B-6 + SL8-B-8 | Analog sensor 0V reference + Crank index sensor − + Sync sensor − | sensor_ground + trigger_in | single_source | |
| OEM-2-D | O2 sensor signal | lambda_nb_in | SL8-B-14 | Analog input 4 | analog_in | single_source | |
| OEM-2-E | Airflow signal (AFM) | analog_in | SL8-B-11 | Analog input 1 | analog_in | single_source | |
| OEM-2-F | Variable resistor (tuning) | analog_in | SL8-B-21 | Analog input 8 (switchable 1k pull-up) | analog_in | single_source | |
| OEM-2-G | Throttle position (TPS) | analog_in | SL8-B-13 | Analog input 3 | analog_in | single_source | |
| OEM-2-H | Atmospheric pressure (ATP) | analog_in | SL8-B-22 | Analog input 9 (switchable 1k pull-up) | analog_in | single_source | |
| OEM-2-I | Coolant temperature (ECT) | temp_in | SL8-B-15 | Analog input 5 | analog_in | single_source | |
| OEM-2-J | Inlet air temperature (IAT) | temp_in | SL8-B-19 | Analog input 6 | analog_in | single_source | |
| OEM-2-K | Turbo control valve (boost) | low_side_out | SL8-A-17 | Auxiliary output 8 | switch_out | single_source | |
| OEM-2-L | Manifold air temperature (MAT) | temp_in | SL8-B-20 | Analog input 7 (switchable 1k pull-up) | analog_in | single_source | |
| OEM-2-M | Pressure regulator control valve | low_side_out | SL8-A-10 | Auxiliary output 1 | switch_out | single_source | |
| OEM-2-N | EGR valve | low_side_out | SL8-A-11 | Auxiliary output 2 | switch_out | single_source | |
| OEM-2-O | Switching valve | low_side_out | SL8-A-12 | Auxiliary output 3 | switch_out | single_source | |
| OEM-2-P | Relief valve | low_side_out | SL8-A-13 | Auxiliary output 4 | switch_out | single_source | |
| OEM-2-Q | Idle control (BAC) | low_side_out | SL8-A-5 | Injection channel 5 | injector_out | single_source | |
| OEM-2-R | Power ground | ground | SL8-B-18 + SL8-B-26 | ECU ground + ECU ground | ground | single_source | |
| OEM-3-A | Power ground | ground | SL8-B-18 + SL8-B-26 | ECU ground + ECU ground | ground | single_source | |
| OEM-3-B | Starter input | digital_in | SL8-A-25 | Digital input 6 | digital_in | single_source | |
| OEM-3-C | Primary injector 2 | injector_out | SL8-A-3 | Injection channel 3 | injector_out | single_source | |
| OEM-3-D | Starter inhibit / fuel pump control | low_side_out | SL8-A-14 | Auxiliary output 5 | switch_out | single_source | |
| OEM-3-E | Primary injector 1 | injector_out | SL8-A-1 | Injection channel 1 | injector_out | single_source | |
| OEM-3-F | Secondary injector 2 | injector_out | SL8-A-4 | Injection channel 4 | injector_out | single_source | |
| OEM-3-G | Power ground | ground | SL8-B-18 + SL8-B-26 | ECU ground + ECU ground | ground | single_source | |
| OEM-3-H | Secondary injector 1 | injector_out | SL8-A-2 | Injection channel 2 | injector_out | single_source | |
| OEM-3-I | Ignition power (+12V via main relay) | power_in | SL8-A-34 + SL8-B-1 | Aux 9–10 14V supply + ECU 14V supply | 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-3-I | SP-14V-1 | 0.85 | no route | Ignition power (+12V via main relay) | — | |
| W2 | SP-14V-1 | SL8-A-34 | 0.85 | no route | Aux 9–10 14V supply | — | |
| W3 | SP-14V-1 | SL8-B-1 | 0.85 | no route | ECU 14V supply | — | |
| W4 | OEM-2-R | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W5 | OEM-3-A | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W6 | OEM-3-G | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W7 | SP-GND-1 | SL8-B-18 | 0.85 | no route | ECU ground | — | |
| W8 | SP-GND-1 | SL8-B-26 | 0.85 | no route | ECU ground | — | |
| W9 | OEM-1-P | SP-0V-1 | 0.5 | no route | CAS ground | — | |
| W10 | OEM-1-Q | SP-0V-1 | 0.5 | no route | CAS ground | — | |
| W11 | OEM-2-C | SP-0V-1 | 0.5 | no route | Sensor ground | — | |
| W12 | SP-0V-1 | SL8-B-10 | 0.5 | no route | Analog sensor 0V reference | — | |
| W13 | OEM-2-A | SL8-B-2 | 0.5 | no route | 5V sensor supply | — | |
| W14 | OEM-1-T | SL8-B-5 | 0.5 | no route | CAS 24-tooth (NE, crank) | — | |
| W15 | SP-0V-1 | SL8-B-6 | 0.5 | no route | Crank index sensor − | — | |
| W16 | OEM-1-N | SL8-B-7 | 0.5 | no route | CAS 2-tooth (G, cam) | — | |
| W17 | SP-0V-1 | SL8-B-8 | 0.5 | no route | Sync sensor − | — | |
| W18 | OEM-1-R | SL8-B-16 | 0.5 | no route | Knock input | — | |
| W19 | OEM-1-U | SL8-A-26 | 0.5 | no route | Ignition select (trailing rotor) | — | |
| W20 | OEM-1-V | SL8-A-27 | 0.5 | no route | Ignition leading | — | |
| W21 | OEM-1-X | SL8-A-28 | 0.5 | no route | Ignition trailing | — | |
| W22 | OEM-3-E | SL8-A-1 | 0.5 | no route | Primary injector 1 | — | |
| W23 | OEM-3-H | SL8-A-2 | 0.5 | no route | Secondary injector 1 | — | |
| W24 | OEM-3-C | SL8-A-3 | 0.5 | no route | Primary injector 2 | — | |
| W25 | OEM-3-F | SL8-A-4 | 0.5 | no route | Secondary injector 2 | — | |
| W26 | OEM-1-F | SL8-B-3 | 0.5 | no route | A/C clutch relay | — | |
| W27 | OEM-3-D | SL8-A-14 | 0.5 | no route | Starter inhibit / fuel pump control | — | |
| W28 | OEM-1-C | SL8-A-15 | 0.5 | no route | Air bypass solenoid | — | |
| W29 | OEM-1-S | SL8-A-16 | 0.5 | no route | Port air valve | — | |
| W30 | OEM-2-K | SL8-A-17 | 0.5 | no route | Turbo control valve (boost) | — | |
| W31 | OEM-2-M | SL8-A-10 | 0.5 | no route | Pressure regulator control valve | — | |
| W32 | OEM-2-N | SL8-A-11 | 0.5 | no route | EGR valve | — | |
| W33 | OEM-2-O | SL8-A-12 | 0.5 | no route | Switching valve | — | |
| W34 | OEM-2-P | SL8-A-13 | 0.5 | no route | Relief valve | — | |
| W35 | OEM-2-Q | SL8-A-5 | 0.5 | no route | Idle control (BAC) | — | |
| W36 | OEM-2-E | SL8-B-11 | 0.5 | no route | Airflow signal (AFM) | — | |
| W37 | OEM-2-B | SL8-B-12 | 0.5 | no route | MAP (pressure) signal | — | |
| W38 | OEM-2-G | SL8-B-13 | 0.5 | no route | Throttle position (TPS) | — | |
| W39 | OEM-2-D | SL8-B-14 | 0.5 | no route | O2 sensor signal | — | |
| W40 | OEM-2-I | SL8-B-15 | 0.5 | no route | Coolant temperature (ECT) | — | |
| W41 | OEM-2-J | SL8-B-19 | 0.5 | no route | Inlet air temperature (IAT) | — | |
| W42 | OEM-2-L | SL8-B-20 | 0.5 | no route | Manifold air temperature (MAT) | — | |
| W43 | OEM-2-F | SL8-B-21 | 0.5 | no route | Variable resistor (tuning) | — | |
| W44 | OEM-2-H | SL8-B-22 | 0.5 | no route | Atmospheric pressure (ATP) | — | |
| W45 | OEM-1-O | SL8-A-20 | 0.5 | no route | Vehicle speed (mileage sensor) | — | |
| W46 | OEM-1-E | SL8-A-21 | 0.5 | no route | A/C request | — | |
| W47 | OEM-1-G | SL8-A-22 | 0.5 | no route | Neutral switch | — | |
| W48 | OEM-1-H | SL8-A-23 | 0.5 | no route | Water temperature switch | — | |
| W49 | OEM-1-L | SL8-A-24 | 0.5 | no route | Clutch switch | — | |
| W50 | OEM-3-B | SL8-A-25 | 0.5 | no route | Starter input | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|---|---|---|---|---|
| connector | 4-1437290-0 | TE | Superseal 1.0 34-way plug, Key 1 | 1.000 | ea |
| connector | 4-1437290-1 | TE | Superseal 1.0 34-way plug, Key 2 | 1.000 | ea |
| terminal | 3-1447221-4 | TE | Superseal 1.0 socket terminal, 20 AWG (0.5 sq mm) | 43.000 | ea |
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| No configured channels. | |||||||
Findings
Open (14)
| Severity | Code | Subject | Message |
|---|---|---|---|
| info | NET_FAMILY | OEM-1-C ↔ SL8-A-15 | OEM-1-C "Air bypass solenoid" [low_side_out] is wired to SL8-A-15 "Auxiliary output 6" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-1-S ↔ SL8-A-16 | OEM-1-S "Port air valve" [low_side_out] is wired to SL8-A-16 "Auxiliary output 7" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-2-I ↔ SL8-B-15 | OEM-2-I "Coolant temperature (ECT)" [temp_in] is wired to SL8-B-15 "Analog input 5" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | NET_FAMILY | OEM-2-J ↔ SL8-B-19 | OEM-2-J "Inlet air temperature (IAT)" [temp_in] is wired to SL8-B-19 "Analog input 6" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | NET_FAMILY | OEM-2-K ↔ SL8-A-17 | OEM-2-K "Turbo control valve (boost)" [low_side_out] is wired to SL8-A-17 "Auxiliary output 8" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-2-L ↔ SL8-B-20 | OEM-2-L "Manifold air temperature (MAT)" [temp_in] is wired to SL8-B-20 "Analog input 7 (switchable 1k pull-up)" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | NET_FAMILY | OEM-2-M ↔ SL8-A-10 | OEM-2-M "Pressure regulator control valve" [low_side_out] is wired to SL8-A-10 "Auxiliary output 1" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-2-N ↔ SL8-A-11 | OEM-2-N "EGR valve" [low_side_out] is wired to SL8-A-11 "Auxiliary output 2" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-2-O ↔ SL8-A-12 | OEM-2-O "Switching valve" [low_side_out] is wired to SL8-A-12 "Auxiliary output 3" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-2-P ↔ SL8-A-13 | OEM-2-P "Relief valve" [low_side_out] is wired to SL8-A-13 "Auxiliary output 4" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-2-Q ↔ SL8-A-5 | OEM-2-Q "Idle control (BAC)" [low_side_out] is wired to SL8-A-5 "Injection channel 5" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-3-D ↔ SL8-A-14 | OEM-3-D "Starter inhibit / fuel pump control" [low_side_out] is wired to SL8-A-14 "Auxiliary output 5" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | SL8-B-8 ↔ SL8-B-10 | SL8-B-8 "Sync sensor −" [trigger_in] is wired to SL8-B-10 "Analog sensor 0V reference" [sensor_ground]. Trigger return tied to sensor/trigger ground: correct for single-ended trigger inputs. |
| info | UNMAPPED | OEM | 1 optional OEM pins are not mapped: OEM-1-M Ignition feedback (tacho) |
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
Fit check: unconfirmed. Confirm these before building: - Trigger pattern for Mazda 13B-T not found in the ECU's docs (Ignition modes support Direct Trailing Spark; trigger decode is generic, no rotary-specific preset documented.) Auto-mapped by auto_map() from the library pin data on 2026-10-06. Review every wire against both manuals before building. Not wired: - OEM-3 J: Battery constant (+12V): Emtron SL8 has no battery-constant input; not needed - SL8-B 17: Knock 1 − left open: the stock knock sensor has one ECU wire; check the ECU manual for single-wire knock sensors - OEM-1 M: Ignition feedback (tacho): no free tacho/frequency_out/low_side/ls_hs on Emtron SL8 - SL8-B 4: Ignition switch input: 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 | 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 | Emtron SL4/SL6/SL8 ECU datasheets | https://docs.emtronaustralia.com.au/engine-management/datasheets/index.html | archive | 2026-10-05 | 1e22846cec94 |
| 4 | vendor_doc | Emtron SL4/SL6/SL8 pinout pages | https://docs.emtronaustralia.com.au/engine-management/wiring/index.html | archive | 2026-10-05 | e52b3da9996a |
| 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/ | — | — | — |