MX-5 Miata Mazdaspeed 2004-05 (BP-ZET turbo, no VVT) → ECUMASTER EMU Black (auto)
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 | 5: read the Findings page before cutting any wire |
| Size of the job | 4 wires · 3 connectors · 0 part lines |
| Tools | Crimp and extraction tools for each terminal family (see Connectors) · wire strippers · multimeter · heat gun + heat-shrink |
| 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 | EMUBLACK-Grey-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | OEM-4-E | EMUBLACK-Grey-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | OEM-4-AE | EMUBLACK-Black-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-4-R | EMUBLACK-Black-32 | 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
EMUBLACK-Black
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Ignition coil #5 | — | — | — | — | — | — | — | — |
| 10 | Switch #1 In | — | — | — | — | — | — | — | — |
| 11 | RS232 TXD | — | — | — | — | — | — | — | — |
| 12 | CAN H | — | — | — | — | — | — | — | — |
| 13 | Battery +12V | — | — | — | — | — | — | — | — |
| 14 | Ignition coil #4 | — | — | — | — | — | — | — | — |
| 15 | EGT in #2 | — | — | — | — | — | — | — | — |
| 16 | Knock Sensor in #2 | — | — | — | — | — | — | — | — |
| 17 | Analog In #3 | — | — | — | — | — | — | — | — |
| 18 | TPS In | — | — | — | — | — | — | — | — |
| 19 | WBO Ip | — | — | — | — | — | — | — | — |
| 2 | EGT in #1 | — | — | — | — | — | — | — | — |
| 20 | VSS In | — | — | — | — | — | — | — | — |
| 21 | Camsync In #1 | — | — | — | — | — | — | — | — |
| 22 | WBO Rcal | — | — | — | — | — | — | — | — |
| 23 | Switch #2 In | — | — | — | — | — | — | — | — |
| 24 | RS232 RXD | — | — | — | — | — | — | — | — |
| 25 | CAN L | — | — | — | — | — | — | — | — |
| 26 | +5V supply | — | — | — | — | — | — | — | — |
| 27 | Power Ground | — | — | — | — | — | — | — | — |
| 28 | Ecu Ground | — | — | — | — | — | — | — | — |
| 29 | Sensor Ground | — | — | — | — | — | — | — | — |
| 3 | Knock Sensor in #1 | — | — | — | — | — | — | — | — |
| 30 | Analog In #4 | — | — | — | — | — | — | — | — |
| 31 | Analog In #1 | — | W3 | — | 0.5 | OEM-4-AE | — | — | — |
| 32 | IAT In | — | W4 | — | 0.5 | OEM-4-R | — | — | — |
| 33 | WBO VGND | — | — | — | — | — | — | — | — |
| 34 | +5V supply | — | — | — | — | — | — | — | — |
| 35 | Analog In #5 | — | — | — | — | — | — | — | — |
| 36 | Switch #3 In | — | — | — | — | — | — | — | — |
| 37 | Analog In #6 | — | — | — | — | — | — | — | — |
| 38 | Sensor Ground | — | — | — | — | — | — | — | — |
| 39 | Sensor Ground | — | — | — | — | — | — | — | — |
| 4 | Analog In #2 | — | — | — | — | — | — | — | — |
| 5 | CLT In | — | — | — | — | — | — | — | — |
| 6 | WBO Vs | — | — | — | — | — | — | — | — |
| 7 | Camsync In #2 | — | — | — | — | — | — | — | — |
| 8 | Primary trigger | — | — | — | — | — | — | — | — |
| 9 | Flex Fuel In | — | — | — | — | — | — | — | — |
EMUBLACK-Grey
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Ignition coil #6 | — | — | — | — | — | — | — | — |
| 10 | H-Bridge #1 Winding B | — | W1 | — | 0.5 | OEM-4-D | — | — | — |
| 11 | H-Bridge #2 Winding B | — | — | — | — | — | — | — | — |
| 12 | AUX 5 | — | — | — | — | — | — | — | — |
| 13 | AUX 2 / Injector #8 | — | — | — | — | — | — | — | — |
| 14 | Injector #5 | — | — | — | — | — | — | — | — |
| 15 | Injector #2 | — | — | — | — | — | — | — | — |
| 16 | Ignition coil #2 | — | — | — | — | — | — | — | — |
| 17 | Power Ground | — | — | — | — | — | — | — | — |
| 18 | Ignition +12V | — | — | — | — | — | — | — | — |
| 19 | WBO Heater | — | — | — | — | — | — | — | — |
| 2 | H-Bridge #1 Winding A | — | W2 | — | 0.5 | OEM-4-E | — | — | — |
| 20 | AUX 4 / Tacho | — | — | — | — | — | — | — | — |
| 21 | AUX 1 / Injector #7 | — | — | — | — | — | — | — | — |
| 22 | Injector #6 | — | — | — | — | — | — | — | — |
| 23 | Injector #3 | — | — | — | — | — | — | — | — |
| 24 | Power Ground | — | — | — | — | — | — | — | — |
| 3 | H-Bridge #2 Winding A | — | — | — | — | — | — | — | — |
| 4 | AUX 6 | — | — | — | — | — | — | — | — |
| 5 | AUX 3 | — | — | — | — | — | — | — | — |
| 6 | Injector #4 | — | — | — | — | — | — | — | — |
| 7 | Injector #1 | — | — | — | — | — | — | — | — |
| 8 | Ignition coil #1 | — | — | — | — | — | — | — | — |
| 9 | Ignition coil #3 | — | — | — | — | — | — | — | — |
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 | EMUBLACK-Black-31 | — | — | — |
| D | Boost control solenoid (turbo) | — | W1 | — | 0.5 | EMUBLACK-Grey-10 | — | — | — |
| E | Boost control solenoid (turbo) | — | W2 | — | 0.5 | EMUBLACK-Grey-2 | — | — | — |
| R | Intake air temperature 2 (IAT2, turbo) | — | W4 | — | 0.5 | EMUBLACK-Black-32 | — | — | — |
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 | EMUBLACK-Black-31 | Analog In #1 | analog_in | LY | single_source |
| OEM-4-D | Boost control solenoid (turbo) | high_side_out | EMUBLACK-Grey-10 | H-Bridge #1 Winding B | hbridge_out | Y | single_source |
| OEM-4-E | Boost control solenoid (turbo) | high_side_out | EMUBLACK-Grey-2 | H-Bridge #1 Winding A | hbridge_out | Y | single_source |
| OEM-4-R | Intake air temperature 2 (IAT2, turbo) | temp_in | EMUBLACK-Black-32 | IAT In | temp_in | VY | single_source |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-4-D | EMUBLACK-Grey-10 | 0.5 | no route | Boost control solenoid (turbo) | — | |
| W2 | OEM-4-E | EMUBLACK-Grey-2 | 0.5 | no route | Boost control solenoid (turbo) | — | |
| W3 | OEM-4-AE | EMUBLACK-Black-31 | 0.5 | no route | BARO/MAP sensor (turbo boost pressure) | — | |
| W4 | OEM-4-R | EMUBLACK-Black-32 | 0.5 | no route | Intake air temperature 2 (IAT2, turbo) | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| No configured channels. | |||||||
Findings
Open (8)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | PHYS_REQUIRED_OPEN | EMUBLACK-Black-13 | EMUBLACK-Black-13 "Battery +12V" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | EMUBLACK-Black-27 | EMUBLACK-Black-27 "Power Ground" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | EMUBLACK-Black-28 | EMUBLACK-Black-28 "Ecu Ground" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | EMUBLACK-Grey-17 | EMUBLACK-Grey-17 "Power Ground" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | EMUBLACK-Grey-24 | EMUBLACK-Grey-24 "Power Ground" is required but not wired. |
| warn | NET_FAMILY | OEM-4-D ↔ EMUBLACK-Grey-10 | OEM-4-D "Boost control solenoid (turbo)" [high_side_out] is wired to EMUBLACK-Grey-10 "H-Bridge #1 Winding B" [hbridge_out]. A half-bridge can act as a high-side switch only if configured that way. |
| warn | NET_FAMILY | OEM-4-E ↔ EMUBLACK-Grey-2 | OEM-4-E "Boost control solenoid (turbo)" [high_side_out] is wired to EMUBLACK-Grey-2 "H-Bridge #1 Winding A" [hbridge_out]. A half-bridge can act as a high-side switch only if configured that way. |
| 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 - EMUBLACK-Black 13: Battery +12V: required by ECUMASTER EMU Black but no stock pin feeds it; wire by hand - EMUBLACK-Black 27: Power Ground: required by ECUMASTER EMU Black but no stock pin feeds it; wire by hand - EMUBLACK-Black 28: Ecu Ground: required by ECUMASTER EMU Black but no stock pin feeds it; wire by hand - EMUBLACK-Grey 17: Power Ground: required by ECUMASTER EMU Black but no stock pin feeds it; wire by hand - EMUBLACK-Grey 24: Power Ground: required by ECUMASTER EMU Black 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 ECUMASTER EMU Black - EMUBLACK-Grey 18: Ignition +12V: 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 | ECUMASTER EMU Black — pinout (Black 39-pin / Grey 24-pin) | https://www.ecumaster.com/wp/wp-content/uploads/2020/05/EMU_Black_pinout.pdf | archive | 2026-10-05 | 096b2b4df1bd |