MX-5 Miata Mazdaspeed 2004-05 (BP-ZET turbo, no VVT) → AMP EFI MS3Pro Ultimate (auto)
MX-5 Miata Mazdaspeed 2004-05 (BP-ZET turbo, no VVT) — AMP EFI — MS3Pro Ultimate
⚠ 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 | 7: read the Findings page before cutting any wire |
| Size of the job | 4 wires · 4 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 | MS3PROULTIMA-B-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | OEM-4-E | MS3PROULTIMA-B-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | OEM-4-AE | MS3PROULTIMA-A-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-4-R | MS3PROULTIMA-A-10 | 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
MS3PROULTIMA-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | High current out 1 | — | — | — | — | — | — | — | — |
| 10 | MAT in | — | W4 | — | 0.5 | OEM-4-R | — | — | — |
| 11 | CLT in | — | — | — | — | — | — | — | — |
| 12 | Analog In 6 | — | — | — | — | — | — | — | — |
| 13 | Power ground | — | — | — | — | — | — | — | — |
| 14 | PWM / Idle Out 1 | — | — | — | — | — | — | — | — |
| 15 | CKP− | — | — | — | — | — | — | — | — |
| 16 | Logic ground | — | — | — | — | — | — | — | — |
| 17 | Analog In 7 | — | — | — | — | — | — | — | — |
| 18 | Sensor return | — | — | — | — | — | — | — | — |
| 19 | Analog in 1 | — | W3 | — | 0.5 | OEM-4-AE | — | — | — |
| 2 | High current out 2 | — | — | — | — | — | — | — | — |
| 20 | Analog in 2 | — | — | — | — | — | — | — | — |
| 21 | Analog in 3 | — | — | — | — | — | — | — | — |
| 22 | Analog In 4 | — | — | — | — | — | — | — | — |
| 23 | Analog In 5 | — | — | — | — | — | — | — | — |
| 24 | Tach out | — | — | — | — | — | — | — | — |
| 25 | O2 in | — | — | — | — | — | — | — | — |
| 26 | CMP+ | — | — | — | — | — | — | — | — |
| 27 | CMP− | — | — | — | — | — | — | — | — |
| 28 | Fuel pump relay out | — | — | — | — | — | — | — | — |
| 29 | PWM out 2 | — | — | — | — | — | — | — | — |
| 3 | Injector out J | — | — | — | — | — | — | — | — |
| 30 | PWM out 3 | — | — | — | — | — | — | — | — |
| 31 | Knock in 1 | — | — | — | — | — | — | — | — |
| 32 | Digital switched in 1 | — | — | — | — | — | — | — | — |
| 33 | CAN L | — | — | — | — | — | — | — | — |
| 34 | CAN H | — | — | — | — | — | — | — | — |
| 35 | 12V+ switched power in | — | — | — | — | — | — | — | — |
| 4 | Injector out I | — | — | — | — | — | — | — | — |
| 5 | High current out 3 | — | — | — | — | — | — | — | — |
| 6 | CKP+ | — | — | — | — | — | — | — | — |
| 7 | Knock In 2 | — | — | — | — | — | — | — | — |
| 8 | 5V+ VREF out 1 | — | — | — | — | — | — | — | — |
| 9 | TPS in | — | — | — | — | — | — | — | — |
MS3PROULTIMA-B
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injector out A | — | — | — | — | — | — | — | — |
| 10 | Injector out F | — | — | — | — | — | — | — | — |
| 11 | Injector out G | — | — | — | — | — | — | — | — |
| 12 | Injector out H | — | — | — | — | — | — | — | — |
| 13 | Spark out G | — | — | — | — | — | — | — | — |
| 14 | Spark out E | — | — | — | — | — | — | — | — |
| 15 | Spark out C | — | — | — | — | — | — | — | — |
| 16 | Spark out H | — | — | — | — | — | — | — | — |
| 17 | Digital frequency in 2 | — | — | — | — | — | — | — | — |
| 18 | Ground | — | — | — | — | — | — | — | — |
| 19 | Digital switched 12V in | — | — | — | — | — | — | — | — |
| 2 | Injector out B | — | — | — | — | — | — | — | — |
| 20 | Digital switched in 2 | — | — | — | — | — | — | — | — |
| 21 | Digital frequency in 3 | — | — | — | — | — | — | — | — |
| 22 | Digital Frequency in 3 VR+ | — | — | — | — | — | — | — | — |
| 23 | Digital Frequency In 3 VR− | — | — | — | — | — | — | — | — |
| 24 | Spark out F | — | — | — | — | — | — | — | — |
| 25 | Spark out B | — | — | — | — | — | — | — | — |
| 26 | Spark out D | — | — | — | — | — | — | — | — |
| 27 | Spark out A | — | — | — | — | — | — | — | — |
| 28 | Digital frequency in 1 | — | — | — | — | — | — | — | — |
| 29 | Digital switched in 3 | — | — | — | — | — | — | — | — |
| 3 | Ground | — | — | — | — | — | — | — | — |
| 30 | Stepper IAC out 1B | — | W1 | — | 0.5 | OEM-4-D | — | — | — |
| 31 | Stepper IAC out 1A | — | W2 | — | 0.5 | OEM-4-E | — | — | — |
| 32 | Stepper IAC out 2A | — | — | — | — | — | — | — | — |
| 33 | Stepper IAC out 2B | — | — | — | — | — | — | — | — |
| 34 | Digital Frequency in 1 VR+ | — | — | — | — | — | — | — | — |
| 35 | Digital Frequency in 1 VR− | — | — | — | — | — | — | — | — |
| 4 | Injector out C | — | — | — | — | — | — | — | — |
| 5 | Ground | — | — | — | — | — | — | — | — |
| 6 | Injector out D | — | — | — | — | — | — | — | — |
| 7 | Ground | — | — | — | — | — | — | — | — |
| 8 | Injector out E | — | — | — | — | — | — | — | — |
| 9 | Ground | — | — | — | — | — | — | — | — |
MS3PROULTIMA-C
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | PWM out 5 | — | — | — | — | — | — | — | — |
| 10 | Digital switched in 5 | — | — | — | — | — | — | — | — |
| 11 | Digital switched in 4 | — | — | — | — | — | — | — | — |
| 12 | Digital I/O 5 | — | — | — | — | — | — | — | — |
| 13 | Digital I/O 3 | — | — | — | — | — | — | — | — |
| 14 | Digital I/O 1 | — | — | — | — | — | — | — | — |
| 15 | 5V+ VREF out 2 | — | — | — | — | — | — | — | — |
| 16 | Fuel only battery 12V+ | — | — | — | — | — | — | — | — |
| 17 | Sensor return | — | — | — | — | — | — | — | — |
| 18 | Sensor return | — | — | — | — | — | — | — | — |
| 19 | Sensor return | — | — | — | — | — | — | — | — |
| 2 | PWM out 4 | — | — | — | — | — | — | — | — |
| 20 | Sensor return | — | — | — | — | — | — | — | — |
| 21 | Sensor return | — | — | — | — | — | — | — | — |
| 22 | 5V+ VREF out 1 | — | — | — | — | — | — | — | — |
| 23 | Keep alive power | — | — | — | — | — | — | — | — |
| 3 | Digital out 2 | — | — | — | — | — | — | — | — |
| 4 | Digital out 1 | — | — | — | — | — | — | — | — |
| 5 | Digital I/O 4 | — | — | — | — | — | — | — | — |
| 6 | Digital I/O 2 | — | — | — | — | — | — | — | — |
| 7 | Analog in 8 | — | — | — | — | — | — | — | — |
| 8 | 5V+ VREF out 2 | — | — | — | — | — | — | — | — |
| 9 | Fuel only coil negative | — | — | — | — | — | — | — | — |
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 | MS3PROULTIMA-A-19 | — | — | — |
| D | Boost control solenoid (turbo) | — | W1 | — | 0.5 | MS3PROULTIMA-B-30 | — | — | — |
| E | Boost control solenoid (turbo) | — | W2 | — | 0.5 | MS3PROULTIMA-B-31 | — | — | — |
| R | Intake air temperature 2 (IAT2, turbo) | — | W4 | — | 0.5 | MS3PROULTIMA-A-10 | — | — | — |
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 | MS3PROULTIMA-A-19 | Analog in 1 | analog_in | LY | single_source |
| OEM-4-D | Boost control solenoid (turbo) | high_side_out | MS3PROULTIMA-B-30 | Stepper IAC out 1B | hbridge_out | Y | single_source |
| OEM-4-E | Boost control solenoid (turbo) | high_side_out | MS3PROULTIMA-B-31 | Stepper IAC out 1A | hbridge_out | Y | single_source |
| OEM-4-R | Intake air temperature 2 (IAT2, turbo) | temp_in | MS3PROULTIMA-A-10 | MAT in | temp_in | VY | single_source |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-4-D | MS3PROULTIMA-B-30 | 0.5 | no route | Boost control solenoid (turbo) | — | |
| W2 | OEM-4-E | MS3PROULTIMA-B-31 | 0.5 | no route | Boost control solenoid (turbo) | — | |
| W3 | OEM-4-AE | MS3PROULTIMA-A-19 | 0.5 | no route | BARO/MAP sensor (turbo boost pressure) | — | |
| W4 | OEM-4-R | MS3PROULTIMA-A-10 | 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 (10)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | PHYS_REQUIRED_OPEN | MS3PROULTIMA-A-13 | MS3PROULTIMA-A-13 "Power ground" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | MS3PROULTIMA-A-35 | MS3PROULTIMA-A-35 "12V+ switched power in" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | MS3PROULTIMA-B-18 | MS3PROULTIMA-B-18 "Ground" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | MS3PROULTIMA-B-3 | MS3PROULTIMA-B-3 "Ground" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | MS3PROULTIMA-B-5 | MS3PROULTIMA-B-5 "Ground" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | MS3PROULTIMA-B-7 | MS3PROULTIMA-B-7 "Ground" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | MS3PROULTIMA-B-9 | MS3PROULTIMA-B-9 "Ground" is required but not wired. |
| warn | NET_FAMILY | OEM-4-D ↔ MS3PROULTIMA-B-30 | OEM-4-D "Boost control solenoid (turbo)" [high_side_out] is wired to MS3PROULTIMA-B-30 "Stepper IAC out 1B" [hbridge_out]. A half-bridge can act as a high-side switch only if configured that way. |
| warn | NET_FAMILY | OEM-4-E ↔ MS3PROULTIMA-B-31 | OEM-4-E "Boost control solenoid (turbo)" [high_side_out] is wired to MS3PROULTIMA-B-31 "Stepper IAC out 1A" [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 - MS3PROULTIMA-A 13: Power ground: required by AMP EFI MS3Pro Ultimate but no stock pin feeds it; wire by hand - MS3PROULTIMA-A 35: 12V+ switched power in: required by AMP EFI MS3Pro Ultimate but no stock pin feeds it; wire by hand - MS3PROULTIMA-B 18: Ground: required by AMP EFI MS3Pro Ultimate but no stock pin feeds it; wire by hand - MS3PROULTIMA-B 3: Ground: required by AMP EFI MS3Pro Ultimate but no stock pin feeds it; wire by hand - MS3PROULTIMA-B 5: Ground: required by AMP EFI MS3Pro Ultimate but no stock pin feeds it; wire by hand - MS3PROULTIMA-B 7: Ground: required by AMP EFI MS3Pro Ultimate but no stock pin feeds it; wire by hand - MS3PROULTIMA-B 9: Ground: required by AMP EFI MS3Pro Ultimate 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 AMP EFI MS3Pro Ultimate - MS3PROULTIMA-B 19: Digital switched 12V in: 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 | AMP EFI: MS3Pro Ultimate manual (v1.210, fw 1.5.2) pinout tables | https://cdn.shopify.com/s/files/1/0960/0014/7754/files/MS3Pro_User_Manual_Firmware_1.5.2_ULTIMATE.pdf?v=1760706068 | archive | 2026-10-05 | 71ed7ed81581 |
| 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 | — | — | — |