MX-5 Miata Mazdaspeed 2004-05 (BP-ZET turbo, no VVT) → Link G4X XtremeX 109-4000 (auto)
MX-5 Miata Mazdaspeed 2004-05 (BP-ZET turbo, no VVT) — Link — G4X XtremeX
⚠ 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 | 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 | G4XXTREMEX-A-A29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | OEM-4-E | G4XXTREMEX-A-A28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | OEM-4-AE | G4XXTREMEX-A-A17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-4-R | G4XXTREMEX-A-A15 | 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
G4XXTREMEX-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A1 | Injector 4 | — | — | — | — | — | — | — | — |
| A10 | Ignition 4 | — | — | — | — | — | — | — | — |
| A11 | Ignition 3 | — | — | — | — | — | — | — | — |
| A12 | Ignition 2 | — | — | — | — | — | — | — | — |
| A13 | Ignition 1 | — | — | — | — | — | — | — | — |
| A14 | Analog Volt 4 | — | — | — | — | — | — | — | — |
| A15 | Analog Temp 1 | — | W4 | — | 0.5 | OEM-4-R | — | — | — |
| A16 | Analog Temp 2 | — | — | — | — | — | — | — | — |
| A17 | Analog Volt 1 | — | W3 | — | 0.5 | OEM-4-AE | — | — | — |
| A18 | Aux 4 | — | — | — | — | — | — | — | — |
| A19 | Aux 3 | — | — | — | — | — | — | — | — |
| A2 | Injector 3 | — | — | — | — | — | — | — | — |
| A20 | Aux 2 | — | — | — | — | — | — | — | — |
| A21 | Aux 1 | — | — | — | — | — | — | — | — |
| A22 | Analog Volt 2 | — | — | — | — | — | — | — | — |
| A23 | Digital Input 3 | — | — | — | — | — | — | — | — |
| A24 | Sensor Ground | — | — | — | — | — | — | — | — |
| A25 | System Ground | — | — | — | — | — | — | — | — |
| A26 | Aux 8 | — | — | — | — | — | — | — | — |
| A27 | Aux 7 | — | — | — | — | — | — | — | — |
| A28 | Aux 6 | — | W2 | — | 0.5 | OEM-4-E | — | — | — |
| A29 | Aux 5 | — | W1 | — | 0.5 | OEM-4-D | — | — | — |
| A3 | Injector 2 | — | — | — | — | — | — | — | — |
| A30 | Digital Input 1 | — | — | — | — | — | — | — | — |
| A31 | Digital Input 2 | — | — | — | — | — | — | — | — |
| A32 | +5V Out | — | — | — | — | — | — | — | — |
| A33 | Analog Volt 3 | — | — | — | — | — | — | — | — |
| A34 | System Ground | — | — | — | — | — | — | — | — |
| A4 | Injector 1 | — | — | — | — | — | — | — | — |
| A5 | +14V ECU Power | — | — | — | — | — | — | — | — |
| A6 | +8V Out | — | — | — | — | — | — | — | — |
| A7 | Shield Ground | — | — | — | — | — | — | — | — |
| A8 | Trigger 1 | — | — | — | — | — | — | — | — |
| A9 | Trigger 2 | — | — | — | — | — | — | — | — |
G4XXTREMEX-B
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| B1 | Injector 8 | — | — | — | — | — | — | — | — |
| B10 | Ignition 8 | — | — | — | — | — | — | — | — |
| B11 | Ignition 7 | — | — | — | — | — | — | — | — |
| B12 | Ignition 6 | — | — | — | — | — | — | — | — |
| B13 | Ignition 5 | — | — | — | — | — | — | — | — |
| B15 | Analog Volt 6 | — | — | — | — | — | — | — | — |
| B16 | Analog Volt 7 | — | — | — | — | — | — | — | — |
| B17 | Shield Ground | — | — | — | — | — | — | — | — |
| B18 | Aux 9 | — | — | — | — | — | — | — | — |
| B19 | Digital Input 6 | — | — | — | — | — | — | — | — |
| B2 | Injector 7 | — | — | — | — | — | — | — | — |
| B20 | Digital Input 5 | — | — | — | — | — | — | — | — |
| B21 | Digital Input 4 | — | — | — | — | — | — | — | — |
| B22 | Sensor Ground | — | — | — | — | — | — | — | — |
| B23 | Analog Volt 8 | — | — | — | — | — | — | — | — |
| B24 | Analog Volt 9 | — | — | — | — | — | — | — | — |
| B25 | System Ground | — | — | — | — | — | — | — | — |
| B26 | Aux 10 | — | — | — | — | — | — | — | — |
| B27 | CAN 2 H | — | — | — | — | — | — | — | — |
| B28 | CAN 2 L | — | — | — | — | — | — | — | — |
| B29 | Digital Input 8 | — | — | — | — | — | — | — | — |
| B3 | Injector 6 | — | — | — | — | — | — | — | — |
| B30 | Digital Input 7 | — | — | — | — | — | — | — | — |
| B31 | Analog Volt 10 | — | — | — | — | — | — | — | — |
| B32 | Analog Volt 11 | — | — | — | — | — | — | — | — |
| B33 | Analog Volt 5 | — | — | — | — | — | — | — | — |
| B34 | System Ground | — | — | — | — | — | — | — | — |
| B4 | Injector 5 | — | — | — | — | — | — | — | — |
| B5 | Aux 9/10 E-Throttle Supply | — | — | — | — | — | — | — | — |
| B6 | Analog Temp 3 | — | — | — | — | — | — | — | — |
| B7 | Analog Temp 4 | — | — | — | — | — | — | — | — |
| B8 | Knock 2 | — | — | — | — | — | — | — | — |
| B9 | Knock 1 | — | — | — | — | — | — | — | — |
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 | G4XXTREMEX-A-A17 | — | — | — |
| D | Boost control solenoid (turbo) | — | W1 | — | 0.5 | G4XXTREMEX-A-A29 | — | — | — |
| E | Boost control solenoid (turbo) | — | W2 | — | 0.5 | G4XXTREMEX-A-A28 | — | — | — |
| R | Intake air temperature 2 (IAT2, turbo) | — | W4 | — | 0.5 | G4XXTREMEX-A-A15 | — | — | — |
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 | G4XXTREMEX-A-A17 | Analog Volt 1 | analog_in | LY | single_source |
| OEM-4-D | Boost control solenoid (turbo) | high_side_out | G4XXTREMEX-A-A29 | Aux 5 | switch_out | Y | single_source |
| OEM-4-E | Boost control solenoid (turbo) | high_side_out | G4XXTREMEX-A-A28 | Aux 6 | switch_out | Y | single_source |
| OEM-4-R | Intake air temperature 2 (IAT2, turbo) | temp_in | G4XXTREMEX-A-A15 | Analog Temp 1 | temp_in | VY | single_source |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-4-D | G4XXTREMEX-A-A29 | 0.5 | no route | Boost control solenoid (turbo) | — | |
| W2 | OEM-4-E | G4XXTREMEX-A-A28 | 0.5 | no route | Boost control solenoid (turbo) | — | |
| W3 | OEM-4-AE | G4XXTREMEX-A-A17 | 0.5 | no route | BARO/MAP sensor (turbo boost pressure) | — | |
| W4 | OEM-4-R | G4XXTREMEX-A-A15 | 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 | G4XXTREMEX-A-A25 | G4XXTREMEX-A-A25 "System Ground" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | G4XXTREMEX-A-A34 | G4XXTREMEX-A-A34 "System Ground" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | G4XXTREMEX-A-A5 | G4XXTREMEX-A-A5 "+14V ECU Power" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | G4XXTREMEX-B-B25 | G4XXTREMEX-B-B25 "System Ground" is required but not wired. |
| error | PHYS_REQUIRED_OPEN | G4XXTREMEX-B-B34 | G4XXTREMEX-B-B34 "System Ground" is required but not wired. |
| info | NET_FAMILY | OEM-4-D ↔ G4XXTREMEX-A-A29 | OEM-4-D "Boost control solenoid (turbo)" [high_side_out] is wired to G4XXTREMEX-A-A29 "Aux 5" [switch_out]. Configure this output as high side. |
| info | NET_FAMILY | OEM-4-E ↔ G4XXTREMEX-A-A28 | OEM-4-E "Boost control solenoid (turbo)" [high_side_out] is wired to G4XXTREMEX-A-A28 "Aux 6" [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 - G4XXTREMEX-A A25: System Ground: required by Link G4X XtremeX but no stock pin feeds it; wire by hand - G4XXTREMEX-A A34: System Ground: required by Link G4X XtremeX but no stock pin feeds it; wire by hand - G4XXTREMEX-A A5: +14V ECU Power: required by Link G4X XtremeX but no stock pin feeds it; wire by hand - G4XXTREMEX-B B25: System Ground: required by Link G4X XtremeX but no stock pin feeds it; wire by hand - G4XXTREMEX-B B34: System Ground: required by Link G4X XtremeX 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 Link G4X XtremeX
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 | Link: G4X XtremeX quickstart guide | https://linkecu.com/documentation/XtremeXQuickstartGuide.pdf | — | — | — |
| 3 | community_copy | YourSpec: Link G4X XtremeX flying-lead harness wiring list | https://wpm.yourspec.com/projects/view/1488 | — | — | — |