MX-5 Miata NB2 2001-05 (BP-Z3, VVT) → Emtron SL4 (auto)
MX-5 Miata NB2 2001-05 (BP-Z3, VVT) — Emtron — SL4
Drawn by Michael Gnankou · Rev 0 · proposal · 2026-10-08
Before you start
| Status | proposal · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | none |
| Size of the job | 49 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 | SP-14V-1 | SL4-A-34 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | SP-14V-1 | SL4-B-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-3-A | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-3-B | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-4-A | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | SL4-B-18 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | SL4-B-26 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-4-O | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-0V-1 | SL4-B-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-4-L | SL4-B-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-3-Y | SL4-B-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | SP-0V-1 | SL4-B-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-3-V | SL4-B-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | SP-0V-1 | SL4-B-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-4-M | SL4-B-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-3-F | SL4-A-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-3-I | SL4-A-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-2-A | SL4-A-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-2-D | SL4-A-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-2-G | SL4-A-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-2-J | SL4-A-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-2-B | SL4-B-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-2-C | SL4-A-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-2-K | SL4-A-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-2-M | SL4-A-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-3-H | SL4-A-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-3-J | SL4-A-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-3-P | SL4-A-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-2-Q | SL4-A-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-2-E | SL4-A-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-2-F | SL4-A-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-2-H | SL4-A-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-4-X | SL4-B-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-4-V | SL4-B-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-4-AA | SL4-B-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-4-W | SL4-B-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-4-P | SL4-B-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-4-N | SL4-B-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-4-AD | SL4-B-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-3-T | SL4-A-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-3-S | SL4-A-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-4-B | SL4-A-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-4-C | SL4-A-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-4-F | SL4-A-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-4-H | SL4-A-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | OEM-4-I | SL4-B-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W49 | OEM-4-J | SL4-B-22 | 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 | 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 |
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 | — | W20 | — | 0.5 | SL4-A-1 | — | — | — |
| B | Cooling fan relay | — | W24 | — | 0.5 | SL4-B-3 | — | — | — |
| C | Condenser fan relay | — | W25 | — | 0.5 | SL4-A-14 | — | — | — |
| D | Injector 2 | — | W21 | — | 0.5 | SL4-A-2 | — | — | — |
| E | EGR valve | — | W32 | — | 0.5 | SL4-A-13 | — | — | — |
| F | EGR valve | — | W33 | — | 0.5 | SL4-A-18 | — | — | — |
| G | Injector 3 | — | W22 | — | 0.5 | SL4-A-3 | — | — | — |
| H | EGR valve | — | W34 | — | 0.5 | SL4-A-19 | — | — | — |
| I | EGR valve | — | — | — | — | — | — | — | — |
| J | Injector 4 | — | W23 | — | 0.5 | SL4-A-4 | — | — | — |
| K | A/C clutch relay | — | W26 | — | 0.5 | SL4-A-15 | — | — | — |
| M | Fuel pump relay | — | W27 | — | 0.5 | SL4-A-16 | — | — | — |
| N | VTCS solenoid (intake butterflies) | — | — | — | — | — | — | — | — |
| P | ISC valve +14V feed | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| Q | ISC valve low side | — | W31 | — | 0.5 | SL4-A-12 | — | — | — |
| R | Malfunction indicator lamp (MIL) | — | — | — | — | — | — | — | — |
OEM-3
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Power ground | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| B | Power ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| D | EGR boost solenoid | — | — | — | — | — | — | — | — |
| E | Charcoal canister purge | — | — | — | — | — | — | — | — |
| F | Ignition 1 (coils 1+4, wasted spark) | — | W18 | — | 0.5 | SL4-A-26 | — | — | — |
| H | Main relay | — | W28 | — | 0.5 | SL4-A-17 | — | — | — |
| I | Ignition 2 (coils 2+3, wasted spark) | — | W19 | — | 0.5 | SL4-A-27 | — | — | — |
| J | Front O2 heater | — | W29 | — | 0.5 | SL4-A-10 | — | — | — |
| M | Alternator control | — | — | — | — | — | — | — | — |
| O | Tachometer output | — | — | — | — | — | — | — | — |
| P | Rear O2 heater | — | W30 | — | 0.5 | SL4-A-11 | — | — | — |
| S | Immobiliser | — | W43 | — | 0.5 | SL4-A-21 | — | — | — |
| T | Vehicle speed | — | W42 | — | 0.5 | SL4-A-20 | — | — | — |
| U | Charge lamp | — | — | — | — | — | — | — | — |
| V | Cam position (CMP) | — | W15 | — | 0.5 | SL4-B-7 | — | — | — |
| Y | Crank position (CKP) | — | W13 | — | 0.5 | SL4-B-5 | — | — | — |
OEM-4
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Power ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| AA | Rear O2 signal | — | W37 | — | 0.5 | SL4-B-13 | — | — | — |
| AD | Fuel level | — | W41 | — | 0.5 | SL4-B-20 | — | — | — |
| AF | ECU power +14V (main relay) | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| AG | Constant +12V | — | — | — | — | — | — | — | — |
| B | Brake switch | — | W44 | — | 0.5 | SL4-A-22 | — | — | — |
| C | Power steering pressure switch | — | W45 | — | 0.5 | SL4-A-23 | — | — | — |
| D | VVT oil-control solenoid | — | — | — | — | — | — | — | — |
| F | A/C request | — | W46 | — | 0.5 | SL4-A-24 | — | — | — |
| H | Neutral switch | — | W47 | — | 0.5 | SL4-A-25 | — | — | — |
| I | Clutch switch | — | W48 | — | 0.5 | SL4-B-21 | — | — | — |
| J | VTCS vacuum switch | — | W49 | — | 0.5 | SL4-B-22 | — | — | — |
| L | +5V sensor supply | — | W12 | — | 0.5 | SL4-B-2 | — | — | — |
| M | Knock sensor | — | W17 | — | 0.5 | SL4-B-16 | — | — | — |
| N | Intake air temperature (IAT) | — | W40 | — | 0.5 | SL4-B-19 | — | — | — |
| O | Signal ground | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| P | Coolant temperature (ECT) | — | W39 | — | 0.5 | SL4-B-15 | — | — | — |
| V | Throttle position (TPS) | — | W36 | — | 0.5 | SL4-B-12 | — | — | — |
| W | Front O2 signal | — | W38 | — | 0.5 | SL4-B-14 | — | — | — |
| X | Mass air flow (MAF) | — | W35 | — | 0.5 | SL4-B-11 | — | — | — |
SL4-A
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injection channel 1 | — | W20 | — | 0.5 | OEM-2-A | — | — | — |
| 2 | Injection channel 2 | — | W21 | — | 0.5 | OEM-2-D | — | — | — |
| 3 | Injection channel 3 | — | W22 | — | 0.5 | OEM-2-G | — | — | — |
| 4 | Injection channel 4 | — | W23 | — | 0.5 | OEM-2-J | — | — | — |
| 5 | NC | — | — | — | — | — | — | — | — |
| 6 | NC | — | — | — | — | — | — | — | — |
| 7 | NC | — | — | — | — | — | — | — | — |
| 8 | NC | — | — | — | — | — | — | — | — |
| 9 | Sensor supply 8V | — | — | — | — | — | — | — | — |
| 10 | Auxiliary output 1 | — | W29 | — | 0.5 | OEM-3-J | — | — | — |
| 11 | Auxiliary output 2 | — | W30 | — | 0.5 | OEM-3-P | — | — | — |
| 12 | Auxiliary output 3 | — | W31 | — | 0.5 | OEM-2-Q | — | — | — |
| 13 | Auxiliary output 4 | — | W32 | — | 0.5 | OEM-2-E | — | — | — |
| 14 | Auxiliary output 5 | — | W25 | — | 0.5 | OEM-2-C | — | — | — |
| 15 | Auxiliary output 6 | — | W26 | — | 0.5 | OEM-2-K | — | — | — |
| 16 | Auxiliary output 7 | — | W27 | — | 0.5 | OEM-2-M | — | — | — |
| 17 | Auxiliary output 8 | — | W28 | — | 0.5 | OEM-3-H | — | — | — |
| 18 | Auxiliary output 9 | — | W33 | — | 0.5 | OEM-2-F | — | — | — |
| 19 | Auxiliary output 10 | — | W34 | — | 0.5 | OEM-2-H | — | — | — |
| 20 | Digital input 1 | — | W42 | — | 0.5 | OEM-3-T | — | — | — |
| 21 | Digital input 2 | — | W43 | — | 0.5 | OEM-3-S | — | — | — |
| 22 | Digital input 3 | — | W44 | — | 0.5 | OEM-4-B | — | — | — |
| 23 | Digital input 4 | — | W45 | — | 0.5 | OEM-4-C | — | — | — |
| 24 | Digital input 5 | — | W46 | — | 0.5 | OEM-4-F | — | — | — |
| 25 | Digital input 6 | — | W47 | — | 0.5 | OEM-4-H | — | — | — |
| 26 | Ignition channel 1 | — | W18 | — | 0.5 | OEM-3-F | — | — | — |
| 27 | Ignition channel 2 | — | W19 | — | 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 | — | W3 | — | 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 | — | W4 | — | 0.85 | SP-14V-1 | — | — | — |
| 2 | Sensor supply Vref1 5.0V | — | W12 | — | 0.5 | OEM-4-L | — | — | — |
| 3 | EFI relay output (low side, 200 mA) | — | W24 | — | 0.5 | OEM-2-B | — | — | — |
| 4 | Ignition switch input | — | — | — | — | — | — | — | — |
| 5 | Crank index sensor + | — | W13 | — | 0.5 | OEM-3-Y | — | — | — |
| 6 | Crank index sensor − | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 7 | Sync sensor + | — | W15 | — | 0.5 | OEM-3-V | — | — | — |
| 8 | Sync sensor − | — | W16 | — | 0.5 | SP-0V-1 | — | — | — |
| 9 | Shield (crank/sync/knock) | — | — | — | — | — | — | — | — |
| 10 | Analog sensor 0V reference | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| 11 | Analog input 1 | — | W35 | — | 0.5 | OEM-4-X | — | — | — |
| 12 | Analog input 2 | — | W36 | — | 0.5 | OEM-4-V | — | — | — |
| 13 | Analog input 3 | — | W37 | — | 0.5 | OEM-4-AA | — | — | — |
| 14 | Analog input 4 | — | W38 | — | 0.5 | OEM-4-W | — | — | — |
| 15 | Analog input 5 | — | W39 | — | 0.5 | OEM-4-P | — | — | — |
| 16 | Knock 1 + | — | W17 | — | 0.5 | OEM-4-M | — | — | — |
| 17 | Knock 1 − | — | — | — | — | — | — | — | — |
| 18 | ECU ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 19 | Analog input 6 | — | W40 | — | 0.5 | OEM-4-N | — | — | — |
| 20 | Analog input 7 (switchable 1k pull-up) | — | W41 | — | 0.5 | OEM-4-AD | — | — | — |
| 21 | Analog input 8 (switchable 1k pull-up) | — | W48 | — | 0.5 | OEM-4-I | — | — | — |
| 22 | Analog input 9 (switchable 1k pull-up) | — | W49 | — | 0.5 | OEM-4-J | — | — | — |
| 23 | Analog input 10 (switchable 1k pull-up) | — | — | — | — | — | — | — | — |
| 24 | Knock 2 + | — | — | — | — | — | — | — | — |
| 25 | Knock 2 − | — | — | — | — | — | — | — | — |
| 26 | ECU ground | — | W9 | — | 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 | — | — | W14 | — | 0.5 | SL4-B-6 | — | — | — |
| 1 | — | — | W10 | — | 0.5 | OEM-4-O | — | — | — |
| 1 | — | — | W11 | — | 0.5 | SL4-B-10 | — | — | — |
| 1 | — | — | W16 | — | 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 | SL4-A-34 | — | — | — |
| 1 | — | — | W4 | — | 0.85 | SL4-B-1 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W5 | — | 0.85 | OEM-3-A | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-3-B | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-4-A | — | — | — |
| 1 | — | — | W8 | — | 0.85 | SL4-B-18 | — | — | — |
| 1 | — | — | W9 | — | 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 | single_source | |
| OEM-2-B | Cooling fan relay | low_side_out | SL4-B-3 | EFI relay output (low side, 200 mA) | low_side_out | single_source | |
| OEM-2-C | Condenser fan relay | low_side_out | SL4-A-14 | Auxiliary output 5 | switch_out | single_source | |
| OEM-2-D | Injector 2 | injector_out | SL4-A-2 | Injection channel 2 | injector_out | single_source | |
| OEM-2-E | EGR valve | low_side_out | SL4-A-13 | Auxiliary output 4 | switch_out | single_source | |
| OEM-2-F | EGR valve | low_side_out | SL4-A-18 | Auxiliary output 9 | hbridge_out | single_source | |
| OEM-2-G | Injector 3 | injector_out | SL4-A-3 | Injection channel 3 | injector_out | single_source | |
| OEM-2-H | EGR valve | low_side_out | SL4-A-19 | Auxiliary output 10 | hbridge_out | single_source | |
| OEM-2-I | EGR valve | low_side_out | — | — | — | single_source | |
| OEM-2-J | Injector 4 | injector_out | SL4-A-4 | Injection channel 4 | injector_out | single_source | |
| OEM-2-K | A/C clutch relay | low_side_out | SL4-A-15 | Auxiliary output 6 | switch_out | single_source | |
| OEM-2-M | Fuel pump relay | low_side_out | SL4-A-16 | Auxiliary output 7 | switch_out | single_source | |
| OEM-2-N | VTCS solenoid (intake butterflies) | low_side_out | — | — | — | 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 | single_source | |
| OEM-2-Q | ISC valve low side | low_side_out | SL4-A-12 | Auxiliary output 3 | switch_out | single_source | |
| OEM-2-R | Malfunction indicator lamp (MIL) | low_side_out | — | — | — | single_source | |
| OEM-3-A | Power ground | ground | SL4-B-18 + SL4-B-26 | ECU ground + ECU ground | ground | single_source | |
| OEM-3-B | Power ground | ground | SL4-B-18 + SL4-B-26 | ECU ground + ECU ground | ground | single_source | |
| OEM-3-D | EGR boost solenoid | low_side_out | — | — | — | single_source | |
| OEM-3-E | Charcoal canister purge | low_side_out | — | — | — | single_source | |
| OEM-3-F | Ignition 1 (coils 1+4, wasted spark) | ignition_out | SL4-A-26 | Ignition channel 1 | ignition_out | single_source | |
| OEM-3-H | Main relay | low_side_out | SL4-A-17 | Auxiliary output 8 | switch_out | single_source | |
| OEM-3-I | Ignition 2 (coils 2+3, wasted spark) | ignition_out | SL4-A-27 | Ignition channel 2 | ignition_out | single_source | |
| OEM-3-J | Front O2 heater | low_side_out | SL4-A-10 | Auxiliary output 1 | switch_out | single_source | |
| OEM-3-M | Alternator control | low_side_out | — | — | — | single_source | |
| OEM-3-O | Tachometer output | tacho_out | — | — | — | single_source | |
| OEM-3-P | Rear O2 heater | low_side_out | SL4-A-11 | Auxiliary output 2 | switch_out | single_source | |
| OEM-3-S | Immobiliser | digital_in | SL4-A-21 | Digital input 2 | digital_in | single_source | |
| OEM-3-T | Vehicle speed | digital_in | SL4-A-20 | Digital input 1 | digital_in | single_source | |
| OEM-3-U | Charge lamp | low_side_out | — | — | — | single_source | |
| OEM-3-V | Cam position (CMP) | trigger_in | SL4-B-7 | Sync sensor + | trigger_in | single_source | |
| OEM-3-Y | Crank position (CKP) | trigger_in | SL4-B-5 | Crank index sensor + | trigger_in | single_source | |
| OEM-4-A | Power ground | ground | SL4-B-18 + SL4-B-26 | ECU ground + ECU ground | ground | single_source | |
| OEM-4-AA | Rear O2 signal | lambda_nb_in | SL4-B-13 | Analog input 3 | analog_in | single_source | |
| OEM-4-AD | Fuel level | analog_in | SL4-B-20 | Analog input 7 (switchable 1k pull-up) | analog_in | single_source | |
| 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 | single_source | |
| OEM-4-AG | Constant +12V | power_in | — | — | — | single_source | |
| OEM-4-B | Brake switch | digital_in | SL4-A-22 | Digital input 3 | digital_in | single_source | |
| OEM-4-C | Power steering pressure switch | digital_in | SL4-A-23 | Digital input 4 | digital_in | single_source | |
| OEM-4-D | VVT oil-control solenoid | low_side_out | — | — | — | single_source | |
| OEM-4-F | A/C request | digital_in | SL4-A-24 | Digital input 5 | digital_in | single_source | |
| OEM-4-H | Neutral switch | digital_in | SL4-A-25 | Digital input 6 | digital_in | single_source | |
| OEM-4-I | Clutch switch | digital_in | SL4-B-21 | Analog input 8 (switchable 1k pull-up) | analog_in | single_source | |
| OEM-4-J | VTCS vacuum switch | digital_in | SL4-B-22 | Analog input 9 (switchable 1k pull-up) | analog_in | single_source | |
| OEM-4-L | +5V sensor supply | vref | SL4-B-2 | Sensor supply Vref1 5.0V | vref | single_source | |
| OEM-4-M | Knock sensor | knock_in | SL4-B-16 | Knock 1 + | knock_in | single_source | |
| OEM-4-N | Intake air temperature (IAT) | temp_in | SL4-B-19 | Analog input 6 | analog_in | 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 | single_source | |
| OEM-4-P | Coolant temperature (ECT) | temp_in | SL4-B-15 | Analog input 5 | analog_in | single_source | |
| OEM-4-V | Throttle position (TPS) | analog_in | SL4-B-12 | Analog input 2 | analog_in | single_source | |
| OEM-4-W | Front O2 signal | lambda_nb_in | SL4-B-14 | Analog input 4 | analog_in | single_source | |
| OEM-4-X | Mass air flow (MAF) | analog_in | SL4-B-11 | Analog input 1 | analog_in | 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 | SP-14V-1 | SL4-A-34 | 0.85 | no route | Aux 9–10 14V supply | — | |
| W4 | SP-14V-1 | SL4-B-1 | 0.85 | no route | ECU 14V supply | — | |
| W5 | OEM-3-A | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W6 | OEM-3-B | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W7 | OEM-4-A | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W8 | SP-GND-1 | SL4-B-18 | 0.85 | no route | ECU ground | — | |
| W9 | SP-GND-1 | SL4-B-26 | 0.85 | no route | ECU ground | — | |
| W10 | OEM-4-O | SP-0V-1 | 0.5 | no route | Signal ground | — | |
| W11 | SP-0V-1 | SL4-B-10 | 0.5 | no route | Analog sensor 0V reference | — | |
| W12 | OEM-4-L | SL4-B-2 | 0.5 | no route | +5V sensor supply | — | |
| W13 | OEM-3-Y | SL4-B-5 | 0.5 | no route | Crank position (CKP) | — | |
| W14 | SP-0V-1 | SL4-B-6 | 0.5 | no route | Crank index sensor − | — | |
| W15 | OEM-3-V | SL4-B-7 | 0.5 | no route | Cam position (CMP) | — | |
| W16 | SP-0V-1 | SL4-B-8 | 0.5 | no route | Sync sensor − | — | |
| W17 | OEM-4-M | SL4-B-16 | 0.5 | no route | Knock sensor | — | |
| W18 | OEM-3-F | SL4-A-26 | 0.5 | no route | Ignition 1 (coils 1+4, wasted spark) | — | |
| W19 | OEM-3-I | SL4-A-27 | 0.5 | no route | Ignition 2 (coils 2+3, wasted spark) | — | |
| W20 | OEM-2-A | SL4-A-1 | 0.5 | no route | Injector 1 | — | |
| W21 | OEM-2-D | SL4-A-2 | 0.5 | no route | Injector 2 | — | |
| W22 | OEM-2-G | SL4-A-3 | 0.5 | no route | Injector 3 | — | |
| W23 | OEM-2-J | SL4-A-4 | 0.5 | no route | Injector 4 | — | |
| W24 | OEM-2-B | SL4-B-3 | 0.5 | no route | Cooling fan relay | — | |
| W25 | OEM-2-C | SL4-A-14 | 0.5 | no route | Condenser fan relay | — | |
| W26 | OEM-2-K | SL4-A-15 | 0.5 | no route | A/C clutch relay | — | |
| W27 | OEM-2-M | SL4-A-16 | 0.5 | no route | Fuel pump relay | — | |
| W28 | OEM-3-H | SL4-A-17 | 0.5 | no route | Main relay | — | |
| W29 | OEM-3-J | SL4-A-10 | 0.5 | no route | Front O2 heater | — | |
| W30 | OEM-3-P | SL4-A-11 | 0.5 | no route | Rear O2 heater | — | |
| W31 | OEM-2-Q | SL4-A-12 | 0.5 | no route | ISC valve low side | — | |
| W32 | OEM-2-E | SL4-A-13 | 0.5 | no route | EGR valve | — | |
| W33 | OEM-2-F | SL4-A-18 | 0.5 | no route | EGR valve | — | |
| W34 | OEM-2-H | SL4-A-19 | 0.5 | no route | EGR valve | — | |
| W35 | OEM-4-X | SL4-B-11 | 0.5 | no route | Mass air flow (MAF) | — | |
| W36 | OEM-4-V | SL4-B-12 | 0.5 | no route | Throttle position (TPS) | — | |
| W37 | OEM-4-AA | SL4-B-13 | 0.5 | no route | Rear O2 signal | — | |
| W38 | OEM-4-W | SL4-B-14 | 0.5 | no route | Front O2 signal | — | |
| W39 | OEM-4-P | SL4-B-15 | 0.5 | no route | Coolant temperature (ECT) | — | |
| W40 | OEM-4-N | SL4-B-19 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W41 | OEM-4-AD | SL4-B-20 | 0.5 | no route | Fuel level | — | |
| W42 | OEM-3-T | SL4-A-20 | 0.5 | no route | Vehicle speed | — | |
| W43 | OEM-3-S | SL4-A-21 | 0.5 | no route | Immobiliser | — | |
| W44 | OEM-4-B | SL4-A-22 | 0.5 | no route | Brake switch | — | |
| W45 | OEM-4-C | SL4-A-23 | 0.5 | no route | Power steering pressure switch | — | |
| W46 | OEM-4-F | SL4-A-24 | 0.5 | no route | A/C request | — | |
| W47 | OEM-4-H | SL4-A-25 | 0.5 | no route | Neutral switch | — | |
| W48 | OEM-4-I | SL4-B-21 | 0.5 | no route | Clutch switch | — | |
| W49 | OEM-4-J | SL4-B-22 | 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 (16)
| Severity | Code | Subject | Message |
|---|---|---|---|
| warn | NET_FAMILY | OEM-2-F ↔ SL4-A-18 | OEM-2-F "EGR valve" [low_side_out] is wired to SL4-A-18 "Auxiliary output 9" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way. |
| warn | NET_FAMILY | OEM-2-H ↔ SL4-A-19 | OEM-2-H "EGR valve" [low_side_out] is wired to SL4-A-19 "Auxiliary output 10" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way. |
| warn | NET_FAMILY | OEM-4-I ↔ SL4-B-21 | OEM-4-I "Clutch switch" [digital_in] is wired to SL4-B-21 "Analog input 8 (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-22 | OEM-4-J "VTCS vacuum 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. |
| 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-E ↔ SL4-A-13 | OEM-2-E "EGR valve" [low_side_out] is wired to SL4-A-13 "Auxiliary output 4" [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-Q ↔ SL4-A-12 | OEM-2-Q "ISC valve low side" [low_side_out] is wired to SL4-A-12 "Auxiliary output 3" [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-10 | OEM-3-J "Front O2 heater" [low_side_out] is wired to SL4-A-10 "Auxiliary output 1" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-3-P ↔ SL4-A-11 | OEM-3-P "Rear 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-4-N ↔ SL4-B-19 | OEM-4-N "Intake air temperature (IAT)" [temp_in] is wired to SL4-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-4-P ↔ SL4-B-15 | OEM-4-P "Coolant temperature (ECT)" [temp_in] is wired to SL4-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 | SL4-B-8 ↔ SL4-B-10 | SL4-B-8 "Sync sensor −" [trigger_in] is wired to SL4-B-10 "Analog sensor 0V reference" [sensor_ground]. Trigger return tied to sensor/trigger ground: correct for single-ended trigger inputs. |
| info | UNMAPPED | OEM | 9 optional OEM pins are not mapped: OEM-2-I EGR valve; OEM-2-N VTCS solenoid (intake butterflies); OEM-2-R Malfunction indicator lamp (MIL); OEM-3-D EGR boost solenoid; OEM-3-E Charcoal canister purge; OEM-3-M Alternator control; OEM-3-O Tachometer output; OEM-3-U Charge lamp; OEM-4-D VVT oil-control solenoid |
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 2026-10-06. 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 I: EGR valve: no free low_side/ls_hs/injector/hbridge on Emtron SL4 - OEM-2 N: VTCS solenoid (intake butterflies): no free low_side/ls_hs/injector/hbridge on Emtron SL4 - OEM-2 R: Malfunction indicator lamp (MIL): no free low_side/ls_hs/injector/hbridge on Emtron SL4 - OEM-3 D: EGR boost solenoid: no free low_side/ls_hs/injector/hbridge on Emtron SL4 - OEM-3 E: Charcoal canister purge: no free low_side/ls_hs/injector/hbridge on Emtron SL4 - OEM-3 M: Alternator control: no free low_side/ls_hs/injector/hbridge on Emtron SL4 - OEM-3 U: Charge lamp: no free low_side/ls_hs/injector/hbridge on Emtron SL4 - OEM-4 D: VVT oil-control solenoid: no free low_side/ls_hs/injector/hbridge on Emtron SL4 - OEM-3 O: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on Emtron SL4 - SL4-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 | 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 |