MX-5 Miata NB2 2001-05 (BP-Z3, VVT; excludes Mazdaspeed) → Emtron SL4 (auto)
MX-5 Miata NB2 2001-05 (BP-Z3, VVT; excludes Mazdaspeed) — Emtron — SL4
Drawn by Michael Gnankou · Rev 0 · proposal · 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.
Install modifications
Steps on the car itself, outside the harness. Every harness for this car inherits them.
- Re-route the pressure-sensor vacuum hose to the intake manifoldrequired
Re-route the pressure sensor's (Mazda "EGR boost sensor", pin 4AE) vacuum hose directly to the intake manifold, bypassing the EGR boost solenoid. The stock ECU multiplexes baro + MAP through that solenoid: with it off the sensor reads atmosphere, with it energized it reads manifold. After re-routing the sensor reads MAP only, so the standalone needs its own barometric source — its onboard baro sensor if fitted, or a separate baro sensor on a spare analog input. (Alternative, not recommended: keep the hose stock and have the ECU energize the solenoid permanently via a low-side output switched with ignition; this costs an output.)
Why: With the solenoid off (its default) the sensor reads atmospheric pressure, not manifold pressure, so a standalone that uses this sensor as its MAP input would read the wrong value.
Where: EGR boost solenoid and the pressure sensor's vacuum hose (sensor signal 4AE).
Source: Justin Barrera — Miata NA/NB wiring corrections
| Status | proposal · 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-2-P | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | OEM-4-AF | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | OEM-4-D | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | SP-14V-1 | SL4-A-34 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | SP-14V-1 | SL4-B-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-3-A | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-3-B | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | OEM-4-A | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | SL4-B-18 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-GND-1 | SL4-B-26 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-4-O | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | SP-0V-1 | SL4-B-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-4-L | SL4-B-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-3-Y | SL4-B-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | SP-0V-1 | SL4-B-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-3-V | SL4-B-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | SP-0V-1 | SL4-B-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-4-M | SL4-B-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-3-F | SL4-A-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-3-I | SL4-A-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-2-A | SL4-A-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-2-D | SL4-A-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-2-G | SL4-A-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-2-J | SL4-A-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-4-X | SL4-B-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-4-V | SL4-B-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-4-P | SL4-B-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-4-S | SL4-B-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-2-B | SL4-B-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-2-C | SL4-A-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-2-K | SL4-A-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-2-M | SL4-A-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-3-H | SL4-A-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-2-O | SL4-A-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-3-J | SL4-A-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-3-P | SL4-A-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-2-Q | SL4-A-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-4-AE | SL4-B-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-4-AA | SL4-B-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-4-W | SL4-B-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-4-N | SL4-B-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-4-AD | SL4-B-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-3-T | SL4-A-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-3-S | SL4-A-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-4-B | SL4-A-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-4-C | SL4-A-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-4-F | SL4-A-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | OEM-4-H | SL4-A-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W49 | OEM-4-I | SL4-B-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W50 | OEM-4-J | SL4-B-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ |
Bench test (before first power-up)
Pre-power install steps (make these cuts/modifications on the car first, then verify the checks below): Re-route the pressure-sensor vacuum hose to the intake manifold.
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 | SL4-A-34 | SL4-B-10 | open (OL) | +12 V supply must not touch sensor ground | |
| 2 | SL4-A-34 | SL4-B-18 | open (OL) | +12 V supply must not touch power ground | |
| 3 | SL4-B-2 | SL4-B-10 | open (OL) | 5 V sensor reference must not touch sensor ground | |
| 4 | SL4-A-34 | SL4-B-2 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 5 | SL4-B-18 | SL4-B-2 | open (OL) | power ground must not touch 5 V sensor reference |
If any reading doesn't match, stop and get help before powering up.
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
OEM-2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Injector 1 | — | W21 | — | 0.5 | SL4-A-1 | — | — | — |
| B | Cooling fan relay | — | W29 | — | 0.5 | SL4-B-3 | — | — | — |
| C | Condenser fan relay | — | W30 | — | 0.5 | SL4-A-14 | — | — | — |
| D | Injector 2 | — | W22 | — | 0.5 | SL4-A-2 | — | — | — |
| E | EGR valve | — | — | — | — | — | — | — | — |
| F | EGR valve | — | — | — | — | — | — | — | — |
| G | Injector 3 | — | W23 | — | 0.5 | SL4-A-3 | — | — | — |
| H | EGR valve | — | — | — | — | — | — | — | — |
| I | EGR valve | — | — | — | — | — | — | — | — |
| J | Injector 4 | — | W24 | — | 0.5 | SL4-A-4 | — | — | — |
| K | A/C clutch relay | — | W31 | — | 0.5 | SL4-A-15 | — | — | — |
| L | NC | — | — | — | — | — | — | — | — |
| M | Fuel pump relay | — | W32 | — | 0.5 | SL4-A-16 | — | — | — |
| N | VTCS solenoid (intake butterflies) | — | — | — | — | — | — | — | — |
| O | Fuel pump relay (non-immobiliser) | — | W34 | — | 0.5 | SL4-A-10 | — | — | — |
| P | ISC valve +14V feed | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| Q | ISC valve low side | — | W37 | — | 0.5 | SL4-A-13 | — | — | — |
| R | Malfunction indicator lamp (MIL) | — | — | — | — | — | — | — | — |
OEM-3
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Power ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| B | Power ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| C | Purge solenoid valve | — | — | — | — | — | — | — | — |
| D | EGR boost solenoid | — | — | — | — | — | — | — | — |
| E | NC | — | — | — | — | — | — | — | — |
| F | Ignition 1 (coils 1+4, wasted spark) | — | W19 | — | 0.5 | SL4-A-26 | — | — | — |
| G | NC | — | — | — | — | — | — | — | — |
| H | Main relay | — | W33 | — | 0.5 | SL4-A-17 | — | — | — |
| I | Ignition 2 (coils 2+3, wasted spark) | — | W20 | — | 0.5 | SL4-A-27 | — | — | — |
| J | Front O2 heater | — | W35 | — | 0.5 | SL4-A-11 | — | — | — |
| K | EVAP leak detection pump | — | — | — | — | — | — | — | — |
| L | NC | — | — | — | — | — | — | — | — |
| M | Alternator control | — | — | — | — | — | — | — | — |
| N | NC | — | — | — | — | — | — | — | — |
| O | Tachometer output | — | — | — | — | — | — | — | — |
| P | Rear O2 heater | — | W36 | — | 0.5 | SL4-A-12 | — | — | — |
| Q | Data link connector (K-line) | — | — | — | — | — | — | — | — |
| R | NC | — | — | — | — | — | — | — | — |
| S | Immobiliser | — | W44 | — | 0.5 | SL4-A-21 | — | — | — |
| T | Vehicle speed | — | W43 | — | 0.5 | SL4-A-20 | — | — | — |
| U | Charge lamp | — | — | — | — | — | — | — | — |
| V | Cam position (CMP) | — | W16 | — | 0.5 | SL4-B-7 | — | — | — |
| W | NC | — | — | — | — | — | — | — | — |
| X | NC | — | — | — | — | — | — | — | — |
| Y | Crank position (CKP) | — | W14 | — | 0.5 | SL4-B-5 | — | — | — |
| Z | NC | — | — | — | — | — | — | — | — |
OEM-4
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Power ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| AA | Rear O2 signal | — | W39 | — | 0.5 | SL4-B-15 | — | — | — |
| AB | NC | — | — | — | — | — | — | — | — |
| AC | TCM (automatic only) | — | — | — | — | — | — | — | — |
| AD | Fuel level | — | W42 | — | 0.5 | SL4-B-21 | — | — | — |
| AE | Pressure sensor (Mazda: EGR boost sensor) | — | W38 | — | 0.5 | SL4-B-14 | — | — | — |
| AF | ECU power +14V (main relay) | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| AG | Constant +12V | — | — | — | — | — | — | — | — |
| AH | EVAP leak detection pump solenoid valve | — | — | — | — | — | — | — | — |
| B | Brake switch | — | W45 | — | 0.5 | SL4-A-22 | — | — | — |
| C | Power steering pressure switch | — | W46 | — | 0.5 | SL4-A-23 | — | — | — |
| D | VVT oil-control solenoid +12V feed | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| E | Diagnostic (DLC TEN) (NA) | — | — | — | — | — | — | — | — |
| F | A/C request | — | W47 | — | 0.5 | SL4-A-24 | — | — | — |
| G | NC | — | — | — | — | — | — | — | — |
| H | Neutral switch | — | W48 | — | 0.5 | SL4-A-25 | — | — | — |
| I | Clutch switch | — | W49 | — | 0.5 | SL4-B-22 | — | — | — |
| J | VTCS vacuum switch | — | W50 | — | 0.5 | SL4-B-23 | — | — | — |
| K | NC | — | — | — | — | — | — | — | — |
| L | +5V sensor supply | — | W13 | — | 0.5 | SL4-B-2 | — | — | — |
| M | Knock sensor | — | W18 | — | 0.5 | SL4-B-16 | — | — | — |
| N | Intake air temperature (IAT) | — | W41 | — | 0.5 | SL4-B-20 | — | — | — |
| O | Signal ground | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| P | Coolant temperature (ECT) | — | W27 | — | 0.5 | SL4-B-13 | — | — | — |
| Q | NC | — | — | — | — | — | — | — | — |
| R | VVT oil-control solenoid (low-side control) | — | — | — | — | — | — | — | — |
| S | Ignition switch (IG1) sense | — | W28 | — | 0.5 | SL4-B-4 | — | — | — |
| T | Generator output voltage (terminal P) | — | — | — | — | — | — | — | — |
| U | NC | — | — | — | — | — | — | — | — |
| V | Throttle position (TPS) | — | W26 | — | 0.5 | SL4-B-12 | — | — | — |
| W | Front O2 signal | — | W40 | — | 0.5 | SL4-B-19 | — | — | — |
| X | Mass air flow (MAF) | — | W25 | — | 0.5 | SL4-B-11 | — | — | — |
| Y | NC | — | — | — | — | — | — | — | — |
| Z | TCM (automatic only) | — | — | — | — | — | — | — | — |
SL4-A
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injection channel 1 | — | W21 | — | 0.5 | OEM-2-A | — | — | — |
| 2 | Injection channel 2 | — | W22 | — | 0.5 | OEM-2-D | — | — | — |
| 3 | Injection channel 3 | — | W23 | — | 0.5 | OEM-2-G | — | — | — |
| 4 | Injection channel 4 | — | W24 | — | 0.5 | OEM-2-J | — | — | — |
| 5 | NC | — | — | — | — | — | — | — | — |
| 6 | NC | — | — | — | — | — | — | — | — |
| 7 | NC | — | — | — | — | — | — | — | — |
| 8 | NC | — | — | — | — | — | — | — | — |
| 9 | Sensor supply 8V | — | — | — | — | — | — | — | — |
| 10 | Auxiliary output 1 | — | W34 | — | 0.5 | OEM-2-O | — | — | — |
| 11 | Auxiliary output 2 | — | W35 | — | 0.5 | OEM-3-J | — | — | — |
| 12 | Auxiliary output 3 | — | W36 | — | 0.5 | OEM-3-P | — | — | — |
| 13 | Auxiliary output 4 | — | W37 | — | 0.5 | OEM-2-Q | — | — | — |
| 14 | Auxiliary output 5 | — | W30 | — | 0.5 | OEM-2-C | — | — | — |
| 15 | Auxiliary output 6 | — | W31 | — | 0.5 | OEM-2-K | — | — | — |
| 16 | Auxiliary output 7 | — | W32 | — | 0.5 | OEM-2-M | — | — | — |
| 17 | Auxiliary output 8 | — | W33 | — | 0.5 | OEM-3-H | — | — | — |
| 18 | Auxiliary output 9 | — | — | — | — | — | — | — | — |
| 19 | Auxiliary output 10 | — | — | — | — | — | — | — | — |
| 20 | Digital input 1 | — | W43 | — | 0.5 | OEM-3-T | — | — | — |
| 21 | Digital input 2 | — | W44 | — | 0.5 | OEM-3-S | — | — | — |
| 22 | Digital input 3 | — | W45 | — | 0.5 | OEM-4-B | — | — | — |
| 23 | Digital input 4 | — | W46 | — | 0.5 | OEM-4-C | — | — | — |
| 24 | Digital input 5 | — | W47 | — | 0.5 | OEM-4-F | — | — | — |
| 25 | Digital input 6 | — | W48 | — | 0.5 | OEM-4-H | — | — | — |
| 26 | Ignition channel 1 | — | W19 | — | 0.5 | OEM-3-F | — | — | — |
| 27 | Ignition channel 2 | — | W20 | — | 0.5 | OEM-3-I | — | — | — |
| 28 | Ignition channel 3 | — | — | — | — | — | — | — | — |
| 29 | Ignition channel 4 | — | — | — | — | — | — | — | — |
| 30 | NC | — | — | — | — | — | — | — | — |
| 31 | NC | — | — | — | — | — | — | — | — |
| 32 | NC | — | — | — | — | — | — | — | — |
| 33 | NC | — | — | — | — | — | — | — | — |
| 34 | Aux 9–10 14V supply | — | W4 | — | 0.85 | SP-14V-1 | — | — | — |
SL4-B
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | ECU 14V supply | — | W5 | — | 0.85 | SP-14V-1 | — | — | — |
| 2 | Sensor supply Vref1 5.0V | — | W13 | — | 0.5 | OEM-4-L | — | — | — |
| 3 | EFI relay output (low side, 200 mA) | — | W29 | — | 0.5 | OEM-2-B | — | — | — |
| 4 | Ignition switch input | — | W28 | — | 0.5 | OEM-4-S | — | — | — |
| 5 | Crank index sensor + | — | W14 | — | 0.5 | OEM-3-Y | — | — | — |
| 6 | Crank index sensor − | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 7 | Sync sensor + | — | W16 | — | 0.5 | OEM-3-V | — | — | — |
| 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 | — | W25 | — | 0.5 | OEM-4-X | — | — | — |
| 12 | Analog input 2 | — | W26 | — | 0.5 | OEM-4-V | — | — | — |
| 13 | Analog input 3 | — | W27 | — | 0.5 | OEM-4-P | — | — | — |
| 14 | Analog input 4 | — | W38 | — | 0.5 | OEM-4-AE | — | — | — |
| 15 | Analog input 5 | — | W39 | — | 0.5 | OEM-4-AA | — | — | — |
| 16 | Knock 1 + | — | W18 | — | 0.5 | OEM-4-M | — | — | — |
| 17 | Knock 1 − | — | — | — | — | — | — | — | — |
| 18 | ECU ground | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| 19 | Analog input 6 | — | W40 | — | 0.5 | OEM-4-W | — | — | — |
| 20 | Analog input 7 (switchable 1k pull-up) | — | W41 | — | 0.5 | OEM-4-N | — | — | — |
| 21 | Analog input 8 (switchable 1k pull-up) | — | W42 | — | 0.5 | OEM-4-AD | — | — | — |
| 22 | Analog input 9 (switchable 1k pull-up) | — | W49 | — | 0.5 | OEM-4-I | — | — | — |
| 23 | Analog input 10 (switchable 1k pull-up) | — | W50 | — | 0.5 | OEM-4-J | — | — | — |
| 24 | Knock 2 + | — | — | — | — | — | — | — | — |
| 25 | Knock 2 − | — | — | — | — | — | — | — | — |
| 26 | ECU ground | — | W10 | — | 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 | — | — | W15 | — | 0.5 | SL4-B-6 | — | — | — |
| 1 | — | — | W11 | — | 0.5 | OEM-4-O | — | — | — |
| 1 | — | — | W12 | — | 0.5 | SL4-B-10 | — | — | — |
| 1 | — | — | W17 | — | 0.5 | SL4-B-8 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-2-P | — | — | — |
| 1 | — | — | W2 | — | 0.85 | OEM-4-AF | — | — | — |
| 1 | — | — | W3 | — | 0.85 | OEM-4-D | — | — | — |
| 1 | — | — | W4 | — | 0.85 | SL4-A-34 | — | — | — |
| 1 | — | — | W5 | — | 0.85 | SL4-B-1 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W6 | — | 0.85 | OEM-3-A | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-3-B | — | — | — |
| 1 | — | — | W8 | — | 0.85 | OEM-4-A | — | — | — |
| 1 | — | — | W9 | — | 0.85 | SL4-B-18 | — | — | — |
| 1 | — | — | W10 | — | 0.85 | SL4-B-26 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-2-A | Injector 1 | injector_out | SL4-A-1 | Injection channel 1 | injector_out | YB | single_source |
| OEM-2-B | Cooling fan relay | low_side_out | SL4-B-3 | EFI relay output (low side, 200 mA) | low_side_out | RY | single_source |
| OEM-2-C | Condenser fan relay | low_side_out | SL4-A-14 | Auxiliary output 5 | switch_out | LW | single_source |
| OEM-2-D | Injector 2 | injector_out | SL4-A-2 | Injection channel 2 | injector_out | VG | single_source |
| OEM-2-E | EGR valve | low_side_out | — | — | — | Lg | single_source |
| OEM-2-F | EGR valve | low_side_out | — | — | — | WG | single_source |
| OEM-2-G | Injector 3 | injector_out | SL4-A-3 | Injection channel 3 | injector_out | YR | single_source |
| OEM-2-H | EGR valve | low_side_out | — | — | — | PB | single_source |
| OEM-2-I | EGR valve | low_side_out | — | — | — | P | single_source |
| OEM-2-J | Injector 4 | injector_out | SL4-A-4 | Injection channel 4 | injector_out | YG | single_source |
| OEM-2-K | A/C clutch relay | low_side_out | SL4-A-15 | Auxiliary output 6 | switch_out | LB | single_source |
| OEM-2-L | NC | — | — | — | — | unverified | |
| OEM-2-M | Fuel pump relay | low_side_out | SL4-A-16 | Auxiliary output 7 | switch_out | RW | single_source |
| OEM-2-N | VTCS solenoid (intake butterflies) | low_side_out | — | — | — | BW | single_source |
| OEM-2-O | Fuel pump relay (non-immobiliser) | low_side_out | SL4-A-10 | Auxiliary output 1 | switch_out | R | single_source |
| OEM-2-P | ISC valve +14V feed | power_in | SL4-A-34 + SL4-B-1 | Aux 9–10 14V supply + ECU 14V supply | power_in | Or | single_source |
| OEM-2-Q | ISC valve low side | low_side_out | SL4-A-13 | Auxiliary output 4 | switch_out | VR | single_source |
| OEM-2-R | Malfunction indicator lamp (MIL) | low_side_out | — | — | — | WL | single_source |
| OEM-3-A | Power ground | ground | SL4-B-18 + SL4-B-26 | ECU ground + ECU ground | ground | B | single_source |
| OEM-3-B | Power ground | ground | SL4-B-18 + SL4-B-26 | ECU ground + ECU ground | ground | BR | single_source |
| OEM-3-C | Purge solenoid valve | low_side_out | — | — | — | GY | single_source |
| OEM-3-D | EGR boost solenoid | — | — | — | — | GyB | single_source |
| OEM-3-E | NC | — | — | — | — | unverified | |
| OEM-3-F | Ignition 1 (coils 1+4, wasted spark) | ignition_out | SL4-A-26 | Ignition channel 1 | ignition_out | BrW | single_source |
| OEM-3-G | NC | — | — | — | — | unverified | |
| OEM-3-H | Main relay | low_side_out | SL4-A-17 | Auxiliary output 8 | switch_out | LOr | single_source |
| OEM-3-I | Ignition 2 (coils 2+3, wasted spark) | ignition_out | SL4-A-27 | Ignition channel 2 | ignition_out | BY | single_source |
| OEM-3-J | Front O2 heater | low_side_out | SL4-A-11 | Auxiliary output 2 | switch_out | BOr | single_source |
| OEM-3-K | EVAP leak detection pump | low_side_out | — | — | — | YB | single_source |
| OEM-3-L | NC | — | — | — | — | unverified | |
| OEM-3-M | Alternator control | low_side_out | — | — | — | GyR | single_source |
| OEM-3-N | NC | — | — | — | — | unverified | |
| OEM-3-O | Tachometer output | tacho_out | — | — | — | GOr | single_source |
| OEM-3-P | Rear O2 heater | low_side_out | SL4-A-12 | Auxiliary output 3 | switch_out | WB | single_source |
| OEM-3-Q | Data link connector (K-line) | serial | — | — | — | GW | single_source |
| OEM-3-R | NC | — | — | — | — | unverified | |
| OEM-3-S | Immobiliser | digital_in | SL4-A-21 | Digital input 2 | digital_in | RB | single_source |
| OEM-3-T | Vehicle speed | digital_in | SL4-A-20 | Digital input 1 | digital_in | GR | single_source |
| OEM-3-U | Charge lamp | low_side_out | — | — | — | BrR | single_source |
| OEM-3-V | Cam position (CMP) | trigger_in | SL4-B-7 | Sync sensor + | trigger_in | GyL | single_source |
| OEM-3-W | NC | — | — | — | — | unverified | |
| OEM-3-X | NC | — | — | — | — | unverified | |
| OEM-3-Y | Crank position (CKP) | trigger_in | SL4-B-5 | Crank index sensor + | trigger_in | VW | single_source |
| OEM-3-Z | NC | — | — | — | — | unverified | |
| OEM-4-A | Power ground | ground | SL4-B-18 + SL4-B-26 | ECU ground + ECU ground | ground | BL | single_source |
| OEM-4-AA | Rear O2 signal | lambda_nb_in | SL4-B-15 | Analog input 5 | analog_in | R | single_source |
| OEM-4-AB | NC | — | — | — | — | unverified | |
| OEM-4-AC | TCM (automatic only) | — | — | — | — | VG | single_source |
| OEM-4-AD | Fuel level | analog_in | SL4-B-21 | Analog input 8 (switchable 1k pull-up) | analog_in | BrB | single_source |
| OEM-4-AE | Pressure sensor (Mazda: EGR boost sensor) | analog_in | SL4-B-14 | Analog input 4 | analog_in | LY | corroborated |
| OEM-4-AF | ECU power +14V (main relay) | power_in | SL4-A-34 + SL4-B-1 | Aux 9–10 14V supply + ECU 14V supply | power_in | WR | single_source |
| OEM-4-AG | Constant +12V | power_in | — | — | — | LR | single_source |
| OEM-4-AH | EVAP leak detection pump solenoid valve | low_side_out | — | — | — | RG | single_source |
| OEM-4-B | Brake switch | digital_in | SL4-A-22 | Digital input 3 | digital_in | G | single_source |
| OEM-4-C | Power steering pressure switch | digital_in | SL4-A-23 | Digital input 4 | digital_in | Br | single_source |
| OEM-4-D | VVT oil-control solenoid +12V feed | power_in | SL4-A-34 + SL4-B-1 | Aux 9–10 14V supply + ECU 14V supply | power_in | Y | single_source |
| OEM-4-E | Diagnostic (DLC TEN) (NA) | serial | — | — | — | LY | single_source |
| OEM-4-F | A/C request | digital_in | SL4-A-24 | Digital input 5 | digital_in | LgB | single_source |
| OEM-4-G | NC | — | — | — | — | unverified | |
| OEM-4-H | Neutral switch | digital_in | SL4-A-25 | Digital input 6 | digital_in | V | single_source |
| OEM-4-I | Clutch switch | digital_in | SL4-B-22 | Analog input 9 (switchable 1k pull-up) | analog_in | WG | single_source |
| OEM-4-J | VTCS vacuum switch | digital_in | SL4-B-23 | Analog input 10 (switchable 1k pull-up) | analog_in | Or | single_source |
| OEM-4-K | NC | — | — | — | — | unverified | |
| OEM-4-L | +5V sensor supply | vref | SL4-B-2 | Sensor supply Vref1 5.0V | vref | LgR | single_source |
| OEM-4-M | Knock sensor | knock_in | SL4-B-16 | Knock 1 + | knock_in | W | single_source |
| OEM-4-N | Intake air temperature (IAT) | temp_in | SL4-B-20 | Analog input 7 (switchable 1k pull-up) | analog_in | PL | single_source |
| OEM-4-O | Signal ground | sensor_ground | SL4-B-10 + SL4-B-6 + SL4-B-8 | Analog sensor 0V reference + Crank index sensor − + Sync sensor − | sensor_ground + trigger_in | BR | single_source |
| OEM-4-P | Coolant temperature (ECT) | temp_in | SL4-B-13 | Analog input 3 | analog_in | RL | single_source |
| OEM-4-Q | NC | — | — | — | — | unverified | |
| OEM-4-R | VVT oil-control solenoid (low-side control) | low_side_out | — | — | — | VY | corroborated |
| OEM-4-S | Ignition switch (IG1) sense | digital_in | SL4-B-4 | Ignition switch input | digital_in | BW | single_source |
| OEM-4-T | Generator output voltage (terminal P) | — | — | — | — | Gy | single_source |
| OEM-4-U | NC | — | — | — | — | unverified | |
| OEM-4-V | Throttle position (TPS) | analog_in | SL4-B-12 | Analog input 2 | analog_in | GB | single_source |
| OEM-4-W | Front O2 signal | lambda_nb_in | SL4-B-19 | Analog input 6 | analog_in | L | single_source |
| OEM-4-X | Mass air flow (MAF) | analog_in | SL4-B-11 | Analog input 1 | analog_in | P | single_source |
| OEM-4-Y | NC | — | — | — | — | unverified | |
| OEM-4-Z | TCM (automatic only) | — | — | — | — | PB | single_source |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-2-P | SP-14V-1 | 0.85 | no route | ISC valve +14V feed | — | |
| W2 | OEM-4-AF | SP-14V-1 | 0.85 | no route | ECU power +14V (main relay) | — | |
| W3 | OEM-4-D | SP-14V-1 | 0.85 | no route | VVT oil-control solenoid +12V feed | — | |
| W4 | SP-14V-1 | SL4-A-34 | 0.85 | no route | Aux 9–10 14V supply | — | |
| W5 | SP-14V-1 | SL4-B-1 | 0.85 | no route | ECU 14V supply | — | |
| W6 | OEM-3-A | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W7 | OEM-3-B | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W8 | OEM-4-A | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W9 | SP-GND-1 | SL4-B-18 | 0.85 | no route | ECU ground | — | |
| W10 | SP-GND-1 | SL4-B-26 | 0.85 | no route | ECU ground | — | |
| W11 | OEM-4-O | SP-0V-1 | 0.5 | no route | Signal ground | — | |
| W12 | SP-0V-1 | SL4-B-10 | 0.5 | no route | Analog sensor 0V reference | — | |
| W13 | OEM-4-L | SL4-B-2 | 0.5 | no route | +5V sensor supply | — | |
| W14 | OEM-3-Y | SL4-B-5 | 0.5 | no route | Crank position (CKP) | — | |
| W15 | SP-0V-1 | SL4-B-6 | 0.5 | no route | Crank index sensor − | — | |
| W16 | OEM-3-V | SL4-B-7 | 0.5 | no route | Cam position (CMP) | — | |
| W17 | SP-0V-1 | SL4-B-8 | 0.5 | no route | Sync sensor − | — | |
| W18 | OEM-4-M | SL4-B-16 | 0.5 | no route | Knock sensor | — | |
| W19 | OEM-3-F | SL4-A-26 | 0.5 | no route | Ignition 1 (coils 1+4, wasted spark) | — | |
| W20 | OEM-3-I | SL4-A-27 | 0.5 | no route | Ignition 2 (coils 2+3, wasted spark) | — | |
| W21 | OEM-2-A | SL4-A-1 | 0.5 | no route | Injector 1 | — | |
| W22 | OEM-2-D | SL4-A-2 | 0.5 | no route | Injector 2 | — | |
| W23 | OEM-2-G | SL4-A-3 | 0.5 | no route | Injector 3 | — | |
| W24 | OEM-2-J | SL4-A-4 | 0.5 | no route | Injector 4 | — | |
| W25 | OEM-4-X | SL4-B-11 | 0.5 | no route | Mass air flow (MAF) | — | |
| W26 | OEM-4-V | SL4-B-12 | 0.5 | no route | Throttle position (TPS) | — | |
| W27 | OEM-4-P | SL4-B-13 | 0.5 | no route | Coolant temperature (ECT) | — | |
| W28 | OEM-4-S | SL4-B-4 | 0.5 | no route | Ignition switch (IG1) sense | — | |
| W29 | OEM-2-B | SL4-B-3 | 0.5 | no route | Cooling fan relay | — | |
| W30 | OEM-2-C | SL4-A-14 | 0.5 | no route | Condenser fan relay | — | |
| W31 | OEM-2-K | SL4-A-15 | 0.5 | no route | A/C clutch relay | — | |
| W32 | OEM-2-M | SL4-A-16 | 0.5 | no route | Fuel pump relay | — | |
| W33 | OEM-3-H | SL4-A-17 | 0.5 | no route | Main relay | — | |
| W34 | OEM-2-O | SL4-A-10 | 0.5 | no route | Fuel pump relay (non-immobiliser) | — | |
| W35 | OEM-3-J | SL4-A-11 | 0.5 | no route | Front O2 heater | — | |
| W36 | OEM-3-P | SL4-A-12 | 0.5 | no route | Rear O2 heater | — | |
| W37 | OEM-2-Q | SL4-A-13 | 0.5 | no route | ISC valve low side | — | |
| W38 | OEM-4-AE | SL4-B-14 | 0.5 | no route | Pressure sensor (Mazda: EGR boost sensor) | — | |
| W39 | OEM-4-AA | SL4-B-15 | 0.5 | no route | Rear O2 signal | — | |
| W40 | OEM-4-W | SL4-B-19 | 0.5 | no route | Front O2 signal | — | |
| W41 | OEM-4-N | SL4-B-20 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W42 | OEM-4-AD | SL4-B-21 | 0.5 | no route | Fuel level | — | |
| W43 | OEM-3-T | SL4-A-20 | 0.5 | no route | Vehicle speed | — | |
| W44 | OEM-3-S | SL4-A-21 | 0.5 | no route | Immobiliser | — | |
| W45 | OEM-4-B | SL4-A-22 | 0.5 | no route | Brake switch | — | |
| W46 | OEM-4-C | SL4-A-23 | 0.5 | no route | Power steering pressure switch | — | |
| W47 | OEM-4-F | SL4-A-24 | 0.5 | no route | A/C request | — | |
| W48 | OEM-4-H | SL4-A-25 | 0.5 | no route | Neutral switch | — | |
| W49 | OEM-4-I | SL4-B-22 | 0.5 | no route | Clutch switch | — | |
| W50 | OEM-4-J | SL4-B-23 | 0.5 | no route | VTCS vacuum switch | — |
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 |
|---|---|---|---|
| warn | NET_FAMILY | OEM-4-I ↔ SL4-B-22 | OEM-4-I "Clutch switch" [digital_in] is wired to SL4-B-22 "Analog input 9 (switchable 1k pull-up)" [analog_in]. Analog and digital on one net. A switch on an analog input works with a pull-up and a threshold; an analog sensor on a digital input loses its value. |
| warn | NET_FAMILY | OEM-4-J ↔ SL4-B-23 | OEM-4-J "VTCS vacuum switch" [digital_in] is wired to SL4-B-23 "Analog input 10 (switchable 1k pull-up)" [analog_in]. Analog and digital on one net. A switch on an analog input works with a pull-up and a threshold; an analog sensor on a digital input loses its value. |
| info | NET_FAMILY | OEM-2-C ↔ SL4-A-14 | OEM-2-C "Condenser fan relay" [low_side_out] is wired to SL4-A-14 "Auxiliary output 5" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-2-K ↔ SL4-A-15 | OEM-2-K "A/C clutch relay" [low_side_out] is wired to SL4-A-15 "Auxiliary output 6" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-2-M ↔ SL4-A-16 | OEM-2-M "Fuel pump relay" [low_side_out] is wired to SL4-A-16 "Auxiliary output 7" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-2-O ↔ SL4-A-10 | OEM-2-O "Fuel pump relay (non-immobiliser)" [low_side_out] is wired to SL4-A-10 "Auxiliary output 1" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-2-Q ↔ SL4-A-13 | OEM-2-Q "ISC valve low side" [low_side_out] is wired to SL4-A-13 "Auxiliary output 4" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-3-H ↔ SL4-A-17 | OEM-3-H "Main relay" [low_side_out] is wired to SL4-A-17 "Auxiliary output 8" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-3-J ↔ SL4-A-11 | OEM-3-J "Front O2 heater" [low_side_out] is wired to SL4-A-11 "Auxiliary output 2" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-3-P ↔ SL4-A-12 | OEM-3-P "Rear O2 heater" [low_side_out] is wired to SL4-A-12 "Auxiliary output 3" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-4-N ↔ SL4-B-20 | OEM-4-N "Intake air temperature (IAT)" [temp_in] is wired to SL4-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-4-O ↔ SL4-B-6 | OEM-4-O "Signal ground" [sensor_ground] is wired to SL4-B-6 "Crank index sensor −" [trigger_in]. Trigger return tied to sensor/trigger ground: correct for single-ended trigger inputs. |
| info | NET_FAMILY | OEM-4-P ↔ SL4-B-13 | OEM-4-P "Coolant temperature (ECT)" [temp_in] is wired to SL4-B-13 "Analog input 3" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | UNMAPPED | OEM | 19 optional OEM pins are not mapped: OEM-2-E EGR valve; OEM-2-F EGR valve; OEM-2-H EGR valve; OEM-2-I EGR valve; OEM-2-N VTCS solenoid (intake butterflies); OEM-2-R Malfunction indicator lamp (MIL); OEM-3-C Purge solenoid valve; OEM-3-D EGR boost solenoid; OEM-3-K EVAP leak detection pump; OEM-3-M Alternator control; OEM-3-O Tachometer output; OEM-3-Q Data link connector (K-line); OEM-3-U Charge lamp; OEM-4-AC TCM (automatic only); OEM-4-AH EVAP leak detection pump solenoid valve; OEM-4-E Diagnostic (DLC TEN) (NA); OEM-4-R VVT oil-control solenoid (low-side control); OEM-4-T Generator output voltage (terminal P); OEM-4-Z TCM (automatic only) |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-4-AG | 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 2026-10-11. Review every wire against both manuals before building. Not wired: - OEM-4 AG: Constant +12V: Emtron SL4 has no battery-constant input; not needed - SL4-B 17: Knock 1 − left open: the stock knock sensor has one ECU wire; check the ECU manual for single-wire knock sensors - OEM-2 E: EGR valve: no free low_side/relay_control/heater_low_side/ls_hs/injector on Emtron SL4 - OEM-2 F: EGR valve: no free low_side/relay_control/heater_low_side/ls_hs/injector on Emtron SL4 - OEM-2 H: EGR valve: no free low_side/relay_control/heater_low_side/ls_hs/injector on Emtron SL4 - OEM-2 I: EGR valve: no free low_side/relay_control/heater_low_side/ls_hs/injector on Emtron SL4 - OEM-2 N: VTCS solenoid (intake butterflies): no free low_side/relay_control/heater_low_side/ls_hs/injector on Emtron SL4 - OEM-2 R: Malfunction indicator lamp (MIL): no free low_side/relay_control/heater_low_side/ls_hs/injector on Emtron SL4 - OEM-3 C: Purge solenoid valve: no free low_side/relay_control/heater_low_side/ls_hs/injector on Emtron SL4 - OEM-3 K: EVAP leak detection pump: no free low_side/relay_control/heater_low_side/ls_hs/injector on Emtron SL4 - OEM-3 M: Alternator control: no free low_side/relay_control/heater_low_side/ls_hs/injector on Emtron SL4 - OEM-3 U: Charge lamp: no free low_side/relay_control/heater_low_side/ls_hs/injector on Emtron SL4 - OEM-4 AH: EVAP leak detection pump solenoid valve: no free low_side/relay_control/heater_low_side/ls_hs/injector on Emtron SL4 - OEM-4 R: VVT oil-control solenoid (low-side control): no free low_side/relay_control/heater_low_side/ls_hs/injector on Emtron SL4 - OEM-3 O: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on Emtron SL4 - OEM-3 Q: Data link connector (K-line): no free k_line on Emtron SL4 - OEM-4 E: Diagnostic (DLC TEN) (NA): no free k_line on Emtron SL4 - OEM-3 D: EGR boost solenoid: not classified in the library; wire by hand - OEM-4 AC: TCM (automatic only): not classified in the library; wire by hand - OEM-4 T: Generator output voltage (terminal P): not classified in the library; wire by hand - OEM-4 Z: TCM (automatic only): not classified in the library; wire by hand
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | oem_manual | 2005 Mazda MX-5 Miata Engine Performance Control System (PCM terminal voltage reference, BP and BP WITH TC) | https://trull.org/alex/pubmirror/www.mellens.net/mazda/Mazda-Miata-2005/engine_control_system.pdf | — | — | — |
| 4 | vendor_doc | Adaptronic eSel039 Select Plugin ECU for Mazda MX5 / Miata NB8B/C (OEM ECU pinout) | https://www.miataturbo.net/attachments/ecus-tuning-54/04-msm-ecu-pinout-104032/nb8bc_oem_ecu_pinouts-224948d1602912806 | — | — | — |
| 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 |
| 4 | vendor_doc | Link G4X MX5NB2X install manual (NB2 2001-05) | https://linkecu.com/documentation/MX5XNB2.pdf | archive | 2026-10-05 | 741efdd9f2c8 |
| 4 | oem_manual | Mazda MX-5 NB2 (2003) wiring diagram — engine / starting / charging | https://web.archive.org/web/20191104195207/http://mellens.net/mazda/mazda_miata_extra_manual/2003_wiring.pdf | — | 2026-10-05 | 5ee0777f12c1 |
| 2 | expert_report | Justin Barrera — Miata NA/NB wiring corrections | — | — | — | — |