MX-5 Miata NA6 1990-93 (B6-ZE, 1.6) → Emtron SL8 (auto)
MX-5 Miata NA6 1990-93 (B6-ZE, 1.6) — Emtron — SL8
Drawn by Michael Gnankou · Rev 0 · proposal · 2026-10-04
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
OEM-1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Constant +12V | — | — | — | — | — | — | — | — |
| B | ECU power +14V (main relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| C | Start signal | — | W29 | — | 0.5 | SL8-A-20 | — | — | — |
| E | Malfunction indicator lamp (MIL) | — | W23 | — | 0.5 | SL8-A-14 | — | — | — |
| G | Ignition 1 (coils 1+4, wasted spark) | — | W17 | — | 0.5 | SL8-A-26 | — | — | — |
| H | Ignition 2 (coils 2+3, wasted spark) | — | W18 | — | 0.5 | SL8-A-27 | — | — | — |
| N | Wide-open throttle switch | — | W30 | — | 0.5 | SL8-A-21 | — | — | — |
| P | Power steering pressure switch | — | W31 | — | 0.5 | SL8-A-22 | — | — | — |
| Q | A/C request | — | W32 | — | 0.5 | SL8-A-23 | — | — | — |
| V | Neutral/clutch switch | — | W33 | — | 0.5 | SL8-A-24 | — | — | — |
OEM-2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Power ground | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| B | Power ground | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| C | Power ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| D | Power ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| E | Crank position (CAS NE) | — | W13 | — | 0.5 | SL8-B-5 | — | — | — |
| F | AFM ground | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| G | Cam position (CAS G) | — | W15 | — | 0.5 | SL8-B-7 | — | — | — |
| I | Tachometer output | — | W24 | — | 0.5 | SL8-A-15 | — | — | — |
| K | +5V sensor supply | — | W12 | — | 0.5 | SL8-B-2 | — | — | — |
| L | Idle switch (TPS) | — | W34 | — | 0.5 | SL8-A-25 | — | — | — |
| N | O2 sensor | — | W26 | — | 0.5 | SL8-B-12 | — | — | — |
| O | Air flow meter (AFM) | — | W25 | — | 0.5 | SL8-B-11 | — | — | — |
| P | Intake air temperature (IAT) | — | W28 | — | 0.5 | SL8-B-14 | — | — | — |
| Q | Coolant temperature (ECT) | — | W27 | — | 0.5 | SL8-B-13 | — | — | — |
| U | Injector 1 | — | W19 | — | 0.5 | SL8-A-1 | — | — | — |
| V | Injector 2 | — | W20 | — | 0.5 | SL8-A-2 | — | — | — |
| Y | Injector 3 | — | W21 | — | 0.5 | SL8-A-3 | — | — | — |
| Z | Injector 4 | — | W22 | — | 0.5 | SL8-A-4 | — | — | — |
SL8-A
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injection channel 1 | — | W19 | — | 0.5 | OEM-2-U | — | — | — |
| 2 | Injection channel 2 | — | W20 | — | 0.5 | OEM-2-V | — | — | — |
| 3 | Injection channel 3 | — | W21 | — | 0.5 | OEM-2-Y | — | — | — |
| 4 | Injection channel 4 | — | W22 | — | 0.5 | OEM-2-Z | — | — | — |
| 5 | Injection channel 5 | — | — | — | — | — | — | — | — |
| 6 | Injection channel 6 | — | — | — | — | — | — | — | — |
| 7 | Injection channel 7 | — | — | — | — | — | — | — | — |
| 8 | Injection channel 8 | — | — | — | — | — | — | — | — |
| 9 | Sensor supply 8V | — | — | — | — | — | — | — | — |
| 10 | Auxiliary output 1 | — | — | — | — | — | — | — | — |
| 11 | Auxiliary output 2 | — | — | — | — | — | — | — | — |
| 12 | Auxiliary output 3 | — | — | — | — | — | — | — | — |
| 13 | Auxiliary output 4 | — | — | — | — | — | — | — | — |
| 14 | Auxiliary output 5 | — | W23 | — | 0.5 | OEM-1-E | — | — | — |
| 15 | Auxiliary output 6 | — | W24 | — | 0.5 | OEM-2-I | — | — | — |
| 16 | Auxiliary output 7 | — | — | — | — | — | — | — | — |
| 17 | Auxiliary output 8 | — | — | — | — | — | — | — | — |
| 18 | Auxiliary output 9 | — | — | — | — | — | — | — | — |
| 19 | Auxiliary output 10 | — | — | — | — | — | — | — | — |
| 20 | Digital input 1 | — | W29 | — | 0.5 | OEM-1-C | — | — | — |
| 21 | Digital input 2 | — | W30 | — | 0.5 | OEM-1-N | — | — | — |
| 22 | Digital input 3 | — | W31 | — | 0.5 | OEM-1-P | — | — | — |
| 23 | Digital input 4 | — | W32 | — | 0.5 | OEM-1-Q | — | — | — |
| 24 | Digital input 5 | — | W33 | — | 0.5 | OEM-1-V | — | — | — |
| 25 | Digital input 6 | — | W34 | — | 0.5 | OEM-2-L | — | — | — |
| 26 | Ignition channel 1 | — | W17 | — | 0.5 | OEM-1-G | — | — | — |
| 27 | Ignition channel 2 | — | W18 | — | 0.5 | OEM-1-H | — | — | — |
| 28 | Ignition channel 3 | — | — | — | — | — | — | — | — |
| 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 | — | W12 | — | 0.5 | OEM-2-K | — | — | — |
| 3 | EFI relay output (low side, 200 mA) | — | — | — | — | — | — | — | — |
| 4 | Ignition switch input | — | — | — | — | — | — | — | — |
| 5 | Crank index sensor + | — | W13 | — | 0.5 | OEM-2-E | — | — | — |
| 6 | Crank index sensor − | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 7 | Sync sensor + | — | W15 | — | 0.5 | OEM-2-G | — | — | — |
| 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 | — | W25 | — | 0.5 | OEM-2-O | — | — | — |
| 12 | Analog input 2 | — | W26 | — | 0.5 | OEM-2-N | — | — | — |
| 13 | Analog input 3 | — | W27 | — | 0.5 | OEM-2-Q | — | — | — |
| 14 | Analog input 4 | — | W28 | — | 0.5 | OEM-2-P | — | — | — |
| 15 | Analog input 5 | — | — | — | — | — | — | — | — |
| 16 | Knock 1 + | — | — | — | — | — | — | — | — |
| 17 | Knock 1 − | — | — | — | — | — | — | — | — |
| 18 | ECU ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 19 | Analog input 6 | — | — | — | — | — | — | — | — |
| 20 | Analog input 7 (switchable 1k pull-up) | — | — | — | — | — | — | — | — |
| 21 | Analog input 8 (switchable 1k pull-up) | — | — | — | — | — | — | — | — |
| 22 | Analog input 9 (switchable 1k pull-up) | — | — | — | — | — | — | — | — |
| 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 | SL8-B-6 | — | — | — |
| 1 | — | — | W10 | — | 0.5 | OEM-2-F | — | — | — |
| 1 | — | — | W11 | — | 0.5 | SL8-B-10 | — | — | — |
| 1 | — | — | W16 | — | 0.5 | SL8-B-8 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-1-B | — | — | — |
| 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-A | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-2-B | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-2-C | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-2-D | — | — | — |
| 1 | — | — | W8 | — | 0.85 | SL8-B-18 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | SL8-B-26 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-1-A | Constant +12V | power_in | — | — | — | single_source | |
| OEM-1-B | ECU power +14V (main relay) | power_in | SL8-A-34 + SL8-B-1 | Aux 9–10 14V supply + ECU 14V supply | power_in | single_source | |
| OEM-1-C | Start signal | digital_in | SL8-A-20 | Digital input 1 | digital_in | single_source | |
| OEM-1-E | Malfunction indicator lamp (MIL) | low_side_out | SL8-A-14 | Auxiliary output 5 | switch_out | single_source | |
| OEM-1-G | Ignition 1 (coils 1+4, wasted spark) | ignition_out | SL8-A-26 | Ignition channel 1 | ignition_out | single_source | |
| OEM-1-H | Ignition 2 (coils 2+3, wasted spark) | ignition_out | SL8-A-27 | Ignition channel 2 | ignition_out | single_source | |
| OEM-1-N | Wide-open throttle switch | digital_in | SL8-A-21 | Digital input 2 | digital_in | single_source | |
| OEM-1-P | Power steering pressure switch | digital_in | SL8-A-22 | Digital input 3 | digital_in | single_source | |
| OEM-1-Q | A/C request | digital_in | SL8-A-23 | Digital input 4 | digital_in | single_source | |
| OEM-1-V | Neutral/clutch switch | digital_in | SL8-A-24 | Digital input 5 | digital_in | single_source | |
| OEM-2-A | Power ground | ground | SL8-B-18 + SL8-B-26 | ECU ground + ECU ground | ground | single_source | |
| OEM-2-B | Power ground | ground | SL8-B-18 + SL8-B-26 | ECU ground + ECU ground | ground | single_source | |
| OEM-2-C | Power ground | ground | SL8-B-18 + SL8-B-26 | ECU ground + ECU ground | ground | single_source | |
| OEM-2-D | Power ground | ground | SL8-B-18 + SL8-B-26 | ECU ground + ECU ground | ground | single_source | |
| OEM-2-E | Crank position (CAS NE) | trigger_in | SL8-B-5 | Crank index sensor + | trigger_in | single_source | |
| OEM-2-F | AFM 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-G | Cam position (CAS G) | trigger_in | SL8-B-7 | Sync sensor + | trigger_in | single_source | |
| OEM-2-I | Tachometer output | tacho_out | SL8-A-15 | Auxiliary output 6 | switch_out | single_source | |
| OEM-2-K | +5V sensor supply | vref | SL8-B-2 | Sensor supply Vref1 5.0V | vref | single_source | |
| OEM-2-L | Idle switch (TPS) | digital_in | SL8-A-25 | Digital input 6 | digital_in | single_source | |
| OEM-2-N | O2 sensor | lambda_nb_in | SL8-B-12 | Analog input 2 | analog_in | single_source | |
| OEM-2-O | Air flow meter (AFM) | analog_in | SL8-B-11 | Analog input 1 | analog_in | single_source | |
| OEM-2-P | Intake air temperature (IAT) | temp_in | SL8-B-14 | Analog input 4 | analog_in | single_source | |
| OEM-2-Q | Coolant temperature (ECT) | temp_in | SL8-B-13 | Analog input 3 | analog_in | single_source | |
| OEM-2-U | Injector 1 | injector_out | SL8-A-1 | Injection channel 1 | injector_out | single_source | |
| OEM-2-V | Injector 2 | injector_out | SL8-A-2 | Injection channel 2 | injector_out | single_source | |
| OEM-2-Y | Injector 3 | injector_out | SL8-A-3 | Injection channel 3 | injector_out | single_source | |
| OEM-2-Z | Injector 4 | injector_out | SL8-A-4 | Injection channel 4 | injector_out | single_source |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-1-B | SP-14V-1 | 0.85 | no route | ECU power +14V (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-A | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W5 | OEM-2-B | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W6 | OEM-2-C | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W7 | OEM-2-D | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W8 | SP-GND-1 | SL8-B-18 | 0.85 | no route | ECU ground | — | |
| W9 | SP-GND-1 | SL8-B-26 | 0.85 | no route | ECU ground | — | |
| W10 | OEM-2-F | SP-0V-1 | 0.5 | no route | AFM ground | — | |
| W11 | SP-0V-1 | SL8-B-10 | 0.5 | no route | Analog sensor 0V reference | — | |
| W12 | OEM-2-K | SL8-B-2 | 0.5 | no route | +5V sensor supply | — | |
| W13 | OEM-2-E | SL8-B-5 | 0.5 | no route | Crank position (CAS NE) | — | |
| W14 | SP-0V-1 | SL8-B-6 | 0.5 | no route | Crank index sensor − | — | |
| W15 | OEM-2-G | SL8-B-7 | 0.5 | no route | Cam position (CAS G) | — | |
| W16 | SP-0V-1 | SL8-B-8 | 0.5 | no route | Sync sensor − | — | |
| W17 | OEM-1-G | SL8-A-26 | 0.5 | no route | Ignition 1 (coils 1+4, wasted spark) | — | |
| W18 | OEM-1-H | SL8-A-27 | 0.5 | no route | Ignition 2 (coils 2+3, wasted spark) | — | |
| W19 | OEM-2-U | SL8-A-1 | 0.5 | no route | Injector 1 | — | |
| W20 | OEM-2-V | SL8-A-2 | 0.5 | no route | Injector 2 | — | |
| W21 | OEM-2-Y | SL8-A-3 | 0.5 | no route | Injector 3 | — | |
| W22 | OEM-2-Z | SL8-A-4 | 0.5 | no route | Injector 4 | — | |
| W23 | OEM-1-E | SL8-A-14 | 0.5 | no route | Malfunction indicator lamp (MIL) | — | |
| W24 | OEM-2-I | SL8-A-15 | 0.5 | no route | Tachometer output | — | |
| W25 | OEM-2-O | SL8-B-11 | 0.5 | no route | Air flow meter (AFM) | — | |
| W26 | OEM-2-N | SL8-B-12 | 0.5 | no route | O2 sensor | — | |
| W27 | OEM-2-Q | SL8-B-13 | 0.5 | no route | Coolant temperature (ECT) | — | |
| W28 | OEM-2-P | SL8-B-14 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W29 | OEM-1-C | SL8-A-20 | 0.5 | no route | Start signal | — | |
| W30 | OEM-1-N | SL8-A-21 | 0.5 | no route | Wide-open throttle switch | — | |
| W31 | OEM-1-P | SL8-A-22 | 0.5 | no route | Power steering pressure switch | — | |
| W32 | OEM-1-Q | SL8-A-23 | 0.5 | no route | A/C request | — | |
| W33 | OEM-1-V | SL8-A-24 | 0.5 | no route | Neutral/clutch switch | — | |
| W34 | OEM-2-L | SL8-A-25 | 0.5 | no route | Idle switch (TPS) | — |
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 |
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| No configured channels. | |||||||
Findings
Open (5)
| Severity | Code | Subject | Message |
|---|---|---|---|
| info | NET_FAMILY | OEM-1-E ↔ SL8-A-14 | OEM-1-E "Malfunction indicator lamp (MIL)" [low_side_out] is wired to SL8-A-14 "Auxiliary output 5" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-2-I ↔ SL8-A-15 | OEM-2-I "Tachometer output" [tacho_out] is wired to SL8-A-15 "Auxiliary output 6" [switch_out]. Frequency output on a general output: set it up as a tacho/frequency output with the right pull-up. |
| info | NET_FAMILY | OEM-2-P ↔ SL8-B-14 | OEM-2-P "Intake air temperature (IAT)" [temp_in] is wired to SL8-B-14 "Analog input 4" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | NET_FAMILY | OEM-2-Q ↔ SL8-B-13 | OEM-2-Q "Coolant temperature (ECT)" [temp_in] is wired to SL8-B-13 "Analog input 3" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | NET_FAMILY | SL8-B-6 ↔ SL8-B-10 | SL8-B-6 "Crank index 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. |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-1-A | 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 2026-10-04. Review every wire against both manuals before building. Not wired: - OEM-1 A: Constant +12V: Emtron SL8 has no battery-constant input; not needed - 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 |
|---|---|---|---|
| 4 | datasheet | Emtron SL4/SL6/SL8 ECU datasheets | https://docs.emtronaustralia.com.au/engine-management/datasheets/index.html |
| 4 | vendor_doc | Emtron SL4/SL6/SL8 pinout pages | https://docs.emtronaustralia.com.au/engine-management/wiring/index.html |
| 4 | vendor_doc | Link G4X MX5X install manual (NA 1.6/1.8) | https://linkecu.com/documentation/MX5X.pdf |