MX-5 Miata Mazdaspeed 2004-05 (BP-ZET turbo, no VVT) → Emtron SL6 (auto)
MX-5 Miata Mazdaspeed 2004-05 (BP-ZET turbo, no VVT) — Emtron — SL6
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 2026-10-11
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.
| Status | draft · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | 3: read the Findings page before cutting any wire |
| Size of the job | 4 wires · 3 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-4-D | SL6-A-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | OEM-4-E | SL6-A-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | OEM-4-AE | SL6-B-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-4-R | SL6-B-12 | 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 |
|---|---|---|---|---|---|
| No supply/ground nets found to cross-check. | |||||
If any reading doesn't match, stop and get help before powering up.
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
OEM-4
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| AC | Data link connector (DLC TEN, turbo) | — | — | — | — | — | — | — | — |
| AE | BARO/MAP sensor (turbo boost pressure) | — | W3 | — | 0.5 | SL6-B-11 | — | — | — |
| D | Boost control solenoid (turbo) | — | W1 | — | 0.5 | SL6-A-14 | — | — | — |
| E | Boost control solenoid (turbo) | — | W2 | — | 0.5 | SL6-A-15 | — | — | — |
| R | Intake air temperature 2 (IAT2, turbo) | — | W4 | — | 0.5 | SL6-B-12 | — | — | — |
SL6-A
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injection channel 1 | — | — | — | — | — | — | — | — |
| 2 | Injection channel 2 | — | — | — | — | — | — | — | — |
| 3 | Injection channel 3 | — | — | — | — | — | — | — | — |
| 4 | Injection channel 4 | — | — | — | — | — | — | — | — |
| 5 | Injection channel 5 | — | — | — | — | — | — | — | — |
| 6 | Injection channel 6 | — | — | — | — | — | — | — | — |
| 7 | NC | — | — | — | — | — | — | — | — |
| 8 | NC | — | — | — | — | — | — | — | — |
| 9 | Sensor supply 8V | — | — | — | — | — | — | — | — |
| 10 | Auxiliary output 1 | — | — | — | — | — | — | — | — |
| 11 | Auxiliary output 2 | — | — | — | — | — | — | — | — |
| 12 | Auxiliary output 3 | — | — | — | — | — | — | — | — |
| 13 | Auxiliary output 4 | — | — | — | — | — | — | — | — |
| 14 | Auxiliary output 5 | — | W1 | — | 0.5 | OEM-4-D | — | — | — |
| 15 | Auxiliary output 6 | — | W2 | — | 0.5 | OEM-4-E | — | — | — |
| 16 | Auxiliary output 7 | — | — | — | — | — | — | — | — |
| 17 | Auxiliary output 8 | — | — | — | — | — | — | — | — |
| 18 | Auxiliary output 9 | — | — | — | — | — | — | — | — |
| 19 | Auxiliary output 10 | — | — | — | — | — | — | — | — |
| 20 | Digital input 1 | — | — | — | — | — | — | — | — |
| 21 | Digital input 2 | — | — | — | — | — | — | — | — |
| 22 | Digital input 3 | — | — | — | — | — | — | — | — |
| 23 | Digital input 4 | — | — | — | — | — | — | — | — |
| 24 | Digital input 5 | — | — | — | — | — | — | — | — |
| 25 | Digital input 6 | — | — | — | — | — | — | — | — |
| 26 | Ignition channel 1 | — | — | — | — | — | — | — | — |
| 27 | Ignition channel 2 | — | — | — | — | — | — | — | — |
| 28 | Ignition channel 3 | — | — | — | — | — | — | — | — |
| 29 | Ignition channel 4 | — | — | — | — | — | — | — | — |
| 30 | Ignition channel 5 | — | — | — | — | — | — | — | — |
| 31 | Ignition channel 6 | — | — | — | — | — | — | — | — |
| 32 | NC | — | — | — | — | — | — | — | — |
| 33 | NC | — | — | — | — | — | — | — | — |
| 34 | Aux 9–10 14V supply | — | — | — | — | — | — | — | — |
SL6-B
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | ECU 14V supply | — | — | — | — | — | — | — | — |
| 2 | Sensor supply Vref1 5.0V | — | — | — | — | — | — | — | — |
| 3 | EFI relay output (low side, 200 mA) | — | — | — | — | — | — | — | — |
| 4 | Ignition switch input | — | — | — | — | — | — | — | — |
| 5 | Crank index sensor + | — | — | — | — | — | — | — | — |
| 6 | Crank index sensor − | — | — | — | — | — | — | — | — |
| 7 | Sync sensor + | — | — | — | — | — | — | — | — |
| 8 | Sync sensor − | — | — | — | — | — | — | — | — |
| 9 | Shield (crank/sync/knock) | — | — | — | — | — | — | — | — |
| 10 | Analog sensor 0V reference | — | — | — | — | — | — | — | — |
| 11 | Analog input 1 | — | W3 | — | 0.5 | OEM-4-AE | — | — | — |
| 12 | Analog input 2 | — | W4 | — | 0.5 | OEM-4-R | — | — | — |
| 13 | Analog input 3 | — | — | — | — | — | — | — | — |
| 14 | Analog input 4 | — | — | — | — | — | — | — | — |
| 15 | Analog input 5 | — | — | — | — | — | — | — | — |
| 16 | Knock 1 + | — | — | — | — | — | — | — | — |
| 17 | Knock 1 − | — | — | — | — | — | — | — | — |
| 18 | ECU ground | — | — | — | — | — | — | — | — |
| 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 | — | — | — | — | — | — | — | — |
| 27 | CAN 1 H | — | — | — | — | — | — | — | — |
| 28 | CAN 1 L | — | — | — | — | — | — | — | — |
| 29 | NC | — | — | — | — | — | — | — | — |
| 30 | NC | — | — | — | — | — | — | — | — |
| 31 | Ethernet Tx + | — | — | — | — | — | — | — | — |
| 32 | Ethernet Tx − | — | — | — | — | — | — | — | — |
| 33 | Ethernet Rx + | — | — | — | — | — | — | — | — |
| 34 | Ethernet Rx − | — | — | — | — | — | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-4-AC | Data link connector (DLC TEN, turbo) | serial | — | — | — | BrY | single_source |
| OEM-4-AE | BARO/MAP sensor (turbo boost pressure) | analog_in | SL6-B-11 | Analog input 1 | analog_in | LY | single_source |
| OEM-4-D | Boost control solenoid (turbo) | high_side_out | SL6-A-14 | Auxiliary output 5 | switch_out | Y | single_source |
| OEM-4-E | Boost control solenoid (turbo) | high_side_out | SL6-A-15 | Auxiliary output 6 | switch_out | Y | single_source |
| OEM-4-R | Intake air temperature 2 (IAT2, turbo) | temp_in | SL6-B-12 | Analog input 2 | analog_in | VY | single_source |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-4-D | SL6-A-14 | 0.5 | no route | Boost control solenoid (turbo) | — | |
| W2 | OEM-4-E | SL6-A-15 | 0.5 | no route | Boost control solenoid (turbo) | — | |
| W3 | OEM-4-AE | SL6-B-11 | 0.5 | no route | BARO/MAP sensor (turbo boost pressure) | — | |
| W4 | OEM-4-R | SL6-B-12 | 0.5 | no route | Intake air temperature 2 (IAT2, turbo) | — |
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) | 4.000 | ea |
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| No configured channels. | |||||||
Findings
Open (7)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | PHYS_REQUIRED_OPEN | SL6-B-1 | SL6-B-1 "ECU 14V supply" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | SL6-B-18 | SL6-B-18 "ECU ground" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | SL6-B-26 | SL6-B-26 "ECU ground" is required but not wired. |
| info | NET_FAMILY | OEM-4-D ↔ SL6-A-14 | OEM-4-D "Boost control solenoid (turbo)" [high_side_out] is wired to SL6-A-14 "Auxiliary output 5" [switch_out]. Configure this output as high side. |
| info | NET_FAMILY | OEM-4-E ↔ SL6-A-15 | OEM-4-E "Boost control solenoid (turbo)" [high_side_out] is wired to SL6-A-15 "Auxiliary output 6" [switch_out]. Configure this output as high side. |
| info | NET_FAMILY | OEM-4-R ↔ SL6-B-12 | OEM-4-R "Intake air temperature 2 (IAT2, turbo)" [temp_in] is wired to SL6-B-12 "Analog input 2" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | UNMAPPED | OEM | 1 optional OEM pins are not mapped: OEM-4-AC Data link connector (DLC TEN, turbo) |
Accepted (0)
| Code | Subject | Reason | By |
|---|
Notes
Auto-mapped by auto_map() from the library pin data on 2026-10-11. Review every wire against both manuals before building. Open items: - Main-relay feed: no ecu_main_power pin on the stock or the new ECU - SL6-B 1: ECU 14V supply: required by Emtron SL6 but no stock pin feeds it; wire by hand - SL6-B 18: ECU ground: required by Emtron SL6 but no stock pin feeds it; wire by hand - SL6-B 26: ECU ground: required by Emtron SL6 but no stock pin feeds it; wire by hand Not wired: - OEM-4 AC: Data link connector (DLC TEN, turbo): no free k_line on Emtron SL6 - SL6-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 | 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 |