MX-5 Miata Mazdaspeed 2004-05 (BP-ZET turbo, no VVT) → MoTeC M800 universal (auto)
MX-5 Miata Mazdaspeed 2004-05 (BP-ZET turbo, no VVT) — MoTeC — M800
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 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.
| 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 | M800-A-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | OEM-4-E | M800-A-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | OEM-4-AE | M800-A-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-4-R | M800-B-3 | 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
M800-A
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | AUX2 | — | W2 | — | 0.5 | OEM-4-E | — | — | — |
| 2 | 5V Engine Sensor Supply | — | — | — | — | — | — | — | — |
| 3 | IGN1 | — | — | — | — | — | — | — | — |
| 4 | IGN2 | — | — | — | — | — | — | — | — |
| 5 | IGN3 | — | — | — | — | — | — | — | — |
| 6 | IGN4 | — | — | — | — | — | — | — | — |
| 7 | IGN5 | — | — | — | — | — | — | — | — |
| 8 | IGN6 | — | — | — | — | — | — | — | — |
| 9 | 5V Auxiliary Sensor Supply | — | — | — | — | — | — | — | — |
| 10 | GND Battery Negative | — | — | — | — | — | — | — | — |
| 11 | GND Battery Negative | — | — | — | — | — | — | — | — |
| 12 | 8V Engine Sensor Supply | — | — | — | — | — | — | — | — |
| 13 | 8V Auxiliary Sensor and CAN Supply | — | — | — | — | — | — | — | — |
| 14 | AV1 | — | W3 | — | 0.5 | OEM-4-AE | — | — | — |
| 15 | Analog Voltage Input 2 | — | — | — | — | — | — | — | — |
| 16 | Analog Voltage Input 3 | — | — | — | — | — | — | — | — |
| 17 | Analog Voltage Input 4 | — | — | — | — | — | — | — | — |
| 18 | AUX1 | — | W1 | — | 0.5 | OEM-4-D | — | — | — |
| 19 | INJ1 | — | — | — | — | — | — | — | — |
| 20 | INJ2 | — | — | — | — | — | — | — | — |
| 21 | INJ3 | — | — | — | — | — | — | — | — |
| 22 | INJ4 | — | — | — | — | — | — | — | — |
| 23 | AUX3 | — | — | — | — | — | — | — | — |
| 24 | AUX4 | — | — | — | — | — | — | — | — |
| 25 | Analog Voltage Input 5 | — | — | — | — | — | — | — | — |
| 26 | VBAT Battery Positive | — | — | — | — | — | — | — | — |
| 27 | INJ5 | — | — | — | — | — | — | — | — |
| 28 | INJ6 | — | — | — | — | — | — | — | — |
| 29 | INJ7 | — | — | — | — | — | — | — | — |
| 30 | INJ8 | — | — | — | — | — | — | — | — |
| 31 | AUX5 | — | — | — | — | — | — | — | — |
| 32 | AUX6 | — | — | — | — | — | — | — | — |
| 33 | AUX7 | — | — | — | — | — | — | — | — |
| 34 | AUX8 | — | — | — | — | — | — | — | — |
M800-B
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Crank Reference Timing Input | — | — | — | — | — | — | — | — |
| 2 | Cam Sync Timing Input | — | — | — | — | — | — | — | — |
| 3 | Analog Temperature Input 1 | — | W4 | — | 0.5 | OEM-4-R | — | — | — |
| 4 | Analog Temperature Input 2 | — | — | — | — | — | — | — | — |
| 5 | Analog Temperature Input 3 | — | — | — | — | — | — | — | — |
| 6 | Analog Temperature Input 4 | — | — | — | — | — | — | — | — |
| 7 | Analog Temperature Input 5 | — | — | — | — | — | — | — | — |
| 8 | Digital Input 1 | — | — | — | — | — | — | — | — |
| 9 | Digital Input 2 | — | — | — | — | — | — | — | — |
| 10 | Digital Input 3 | — | — | — | — | — | — | — | — |
| 11 | Digital Input 4 | — | — | — | — | — | — | — | — |
| 12 | Lambda2 Sense Voltage | — | — | — | — | — | — | — | — |
| 13 | Lambda2 Pump Current | — | — | — | — | — | — | — | — |
| 14 | 0V Comms Reference | — | — | — | — | — | — | — | — |
| 15 | 0V Auxiliary Sensor Supply | — | — | — | — | — | — | — | — |
| 16 | 0V Engine Sensor Supply | — | — | — | — | — | — | — | — |
| 17 | RS232 Transmit Data | — | — | — | — | — | — | — | — |
| 18 | RS232 Receive Data | — | — | — | — | — | — | — | — |
| 19 | Analog Temperature Input 6 | — | — | — | — | — | — | — | — |
| 20 | Analog Voltage Input 6 | — | — | — | — | — | — | — | — |
| 21 | AV7 | — | — | — | — | — | — | — | — |
| 22 | AV8 | — | — | — | — | — | — | — | — |
| 23 | CAN Bus High | — | — | — | — | — | — | — | — |
| 24 | CAN Bus Low | — | — | — | — | — | — | — | — |
| 25 | Lambda1 Sense Voltage | — | — | — | — | — | — | — | — |
| 26 | Lambda1 Pump Current | — | — | — | — | — | — | — | — |
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 | M800-A-14 | — | — | — |
| D | Boost control solenoid (turbo) | — | W1 | — | 0.5 | M800-A-18 | — | — | — |
| E | Boost control solenoid (turbo) | — | W2 | — | 0.5 | M800-A-1 | — | — | — |
| R | Intake air temperature 2 (IAT2, turbo) | — | W4 | — | 0.5 | M800-B-3 | — | — | — |
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 | M800-A-14 | AV1 | analog_in | LY | single_source |
| OEM-4-D | Boost control solenoid (turbo) | high_side_out | M800-A-18 | AUX1 | switch_out | Y | single_source |
| OEM-4-E | Boost control solenoid (turbo) | high_side_out | M800-A-1 | AUX2 | switch_out | Y | single_source |
| OEM-4-R | Intake air temperature 2 (IAT2, turbo) | temp_in | M800-B-3 | Analog Temperature Input 1 | temp_in | VY | single_source |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-4-D | M800-A-18 | 0.5 | no route | Boost control solenoid (turbo) | — | |
| W2 | OEM-4-E | M800-A-1 | 0.5 | no route | Boost control solenoid (turbo) | — | |
| W3 | OEM-4-AE | M800-A-14 | 0.5 | no route | BARO/MAP sensor (turbo boost pressure) | — | |
| W4 | OEM-4-R | M800-B-3 | 0.5 | no route | Intake air temperature 2 (IAT2, turbo) | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|---|---|---|---|---|
| connector | 3-1437290-7 | TE | Superseal 1.0 26-way plug | 1.000 | ea |
| connector | 4-1437290-0 | TE | Superseal 1.0 34-way plug, Key 1 | 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 (6)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | PHYS_REQUIRED_OPEN | M800-A-10 | M800-A-10 "GND Battery Negative" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | M800-A-11 | M800-A-11 "GND Battery Negative" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | M800-A-26 | M800-A-26 "VBAT Battery Positive" is required but not wired. |
| info | NET_FAMILY | OEM-4-D ↔ M800-A-18 | OEM-4-D "Boost control solenoid (turbo)" [high_side_out] is wired to M800-A-18 "AUX1" [switch_out]. Configure this output as high side. |
| info | NET_FAMILY | OEM-4-E ↔ M800-A-1 | OEM-4-E "Boost control solenoid (turbo)" [high_side_out] is wired to M800-A-1 "AUX2" [switch_out]. Configure this output as high side. |
| 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 - M800-A 10: GND Battery Negative: required by MoTeC M800 but no stock pin feeds it; wire by hand - M800-A 11: GND Battery Negative: required by MoTeC M800 but no stock pin feeds it; wire by hand - M800-A 26: VBAT Battery Positive: required by MoTeC M800 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 MoTeC M800
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 | MoTeC M400/M600/M800/M880 Manual — Appendix L: Pin list by Function | https://starracecars.com/wp-content/uploads/resources/M400_M600_M800_M880_Manual_A5.pdf | archive | 2026-10-05 | b69bb8ffb674 |
| 4 | vendor_doc | MoTeC M800 OEM WRX56 Installation | https://motec.com.au | archive | 2026-10-05 | 2ca4be92bb65 |