MX-5 Miata NA8 1996-97 (BP-ZE, 1.8, OBD-II) → Link G4X XtremeX 109-4000 (auto)
MX-5 Miata NA8 1996-97 (BP-ZE, 1.8, OBD-II) — Link — G4X XtremeX
Drawn by Michael Gnankou · Rev 0 · proposal · 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 | proposal · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | none |
| Size of the job | 52 wires · 8 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-B | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | SP-14V-1 | G4XXTREMEX-A-A5 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-14V-1 | G4XXTREMEX-B-B5 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-4-A | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-4-C | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-4-D | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-4-K | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | G4XXTREMEX-A-A25 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | G4XXTREMEX-A-A34 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-GND-1 | G4XXTREMEX-B-B25 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-GND-1 | G4XXTREMEX-B-B34 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-3-O | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-4-H | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | SP-0V-1 | G4XXTREMEX-A-A24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | SP-0V-1 | G4XXTREMEX-B-B22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-3-I | G4XXTREMEX-A-A32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-4-E | G4XXTREMEX-A-A8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-4-G | G4XXTREMEX-A-A9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-4-F | G4XXTREMEX-A-A30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-4-N | G4XXTREMEX-A-A13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-4-R | G4XXTREMEX-A-A12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-4-U | G4XXTREMEX-A-A4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-4-V | G4XXTREMEX-A-A3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-4-W | G4XXTREMEX-A-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-4-X | G4XXTREMEX-A-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-3-B | G4XXTREMEX-A-A17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-3-F | G4XXTREMEX-A-A22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-3-G | G4XXTREMEX-A-A15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-1-A | G4XXTREMEX-A-A21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-1-B | G4XXTREMEX-A-A20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-1-G | G4XXTREMEX-A-A19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-1-U | G4XXTREMEX-A-A18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-3-M | G4XXTREMEX-A-A29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-1-E | G4XXTREMEX-A-A28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-4-J | G4XXTREMEX-A-A27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-4-O | G4XXTREMEX-A-A26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-4-P | G4XXTREMEX-B-B4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-4-Q | G4XXTREMEX-B-B3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-4-T | G4XXTREMEX-B-B2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-3-H | G4XXTREMEX-A-A33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-3-N | G4XXTREMEX-A-A14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-3-C | G4XXTREMEX-B-B33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-3-D | G4XXTREMEX-B-B15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-3-K | G4XXTREMEX-A-A16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-3-J | G4XXTREMEX-B-B16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-1-M | G4XXTREMEX-A-A31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-1-C | G4XXTREMEX-A-A23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | OEM-1-K | G4XXTREMEX-B-B21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W49 | OEM-1-L | G4XXTREMEX-B-B20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W50 | OEM-1-Q | G4XXTREMEX-B-B19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W51 | OEM-3-L | G4XXTREMEX-B-B30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W52 | OEM-3-P | G4XXTREMEX-B-B29 | 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 |
|---|---|---|---|---|---|
| 1 | G4XXTREMEX-A-A32 | G4XXTREMEX-A-A24 | open (OL) | 5 V sensor reference must not touch sensor ground | |
| 2 | G4XXTREMEX-A-A32 | G4XXTREMEX-A-A25 | open (OL) | 5 V sensor reference must not touch power ground | |
| 3 | G4XXTREMEX-A-A24 | G4XXTREMEX-A-A5 | open (OL) | sensor ground must not touch +12 V supply | |
| 4 | G4XXTREMEX-A-A25 | G4XXTREMEX-A-A5 | open (OL) | power ground must not touch +12 V supply | |
| 5 | G4XXTREMEX-A-A32 | G4XXTREMEX-A-A5 | open (OL) | 5 V sensor reference must not touch +12 V supply |
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 | — | W25 | — | 0.5 | OEM-4-X | — | — | — |
| A10 | Ignition 4 | — | — | — | — | — | — | — | — |
| A11 | Ignition 3 | — | — | — | — | — | — | — | — |
| A12 | Ignition 2 | — | W21 | — | 0.5 | OEM-4-R | — | — | — |
| A13 | Ignition 1 | — | W20 | — | 0.5 | OEM-4-N | — | — | — |
| A14 | Analog Volt 4 | — | W41 | — | 0.5 | OEM-3-N | — | — | — |
| A15 | Analog Temp 1 | — | W28 | — | 0.5 | OEM-3-G | — | — | — |
| A16 | Analog Temp 2 | — | W44 | — | 0.5 | OEM-3-K | — | — | — |
| A17 | Analog Volt 1 | — | W26 | — | 0.5 | OEM-3-B | — | — | — |
| A18 | Aux 4 | — | W32 | — | 0.5 | OEM-1-U | — | — | — |
| A19 | Aux 3 | — | W31 | — | 0.5 | OEM-1-G | — | — | — |
| A2 | Injector 3 | — | W24 | — | 0.5 | OEM-4-W | — | — | — |
| A20 | Aux 2 | — | W30 | — | 0.5 | OEM-1-B | — | — | — |
| A21 | Aux 1 | — | W29 | — | 0.5 | OEM-1-A | — | — | — |
| A22 | Analog Volt 2 | — | W27 | — | 0.5 | OEM-3-F | — | — | — |
| A23 | Digital Input 3 | — | W47 | — | 0.5 | OEM-1-C | — | — | — |
| A24 | Sensor Ground | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| A25 | System Ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| A26 | Aux 8 | — | W36 | — | 0.5 | OEM-4-O | — | — | — |
| A27 | Aux 7 | — | W35 | — | 0.5 | OEM-4-J | — | — | — |
| A28 | Aux 6 | — | W34 | — | 0.5 | OEM-1-E | — | — | — |
| A29 | Aux 5 | — | W33 | — | 0.5 | OEM-3-M | — | — | — |
| A3 | Injector 2 | — | W23 | — | 0.5 | OEM-4-V | — | — | — |
| A30 | Digital Input 1 | — | W19 | — | 0.5 | OEM-4-F | — | — | — |
| A31 | Digital Input 2 | — | W46 | — | 0.5 | OEM-1-M | — | — | — |
| A32 | +5V Out | — | W16 | — | 0.5 | OEM-3-I | — | — | — |
| A33 | Analog Volt 3 | — | W40 | — | 0.5 | OEM-3-H | — | — | — |
| A34 | System Ground | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| A4 | Injector 1 | — | W22 | — | 0.5 | OEM-4-U | — | — | — |
| A5 | +14V ECU Power | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| A6 | +8V Out | — | — | — | — | — | — | — | — |
| A7 | Shield Ground | — | — | — | — | — | — | — | — |
| A8 | Trigger 1 | — | W17 | — | 0.5 | OEM-4-E | — | — | — |
| A9 | Trigger 2 | — | W18 | — | 0.5 | OEM-4-G | — | — | — |
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 | — | W43 | — | 0.5 | OEM-3-D | — | — | — |
| B16 | Analog Volt 7 | — | W45 | — | 0.5 | OEM-3-J | — | — | — |
| B17 | Shield Ground | — | — | — | — | — | — | — | — |
| B18 | Aux 9 | — | — | — | — | — | — | — | — |
| B19 | Digital Input 6 | — | W50 | — | 0.5 | OEM-1-Q | — | — | — |
| B2 | Injector 7 | — | W39 | — | 0.5 | OEM-4-T | — | — | — |
| B20 | Digital Input 5 | — | W49 | — | 0.5 | OEM-1-L | — | — | — |
| B21 | Digital Input 4 | — | W48 | — | 0.5 | OEM-1-K | — | — | — |
| B22 | Sensor Ground | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| B23 | Analog Volt 8 | — | — | — | — | — | — | — | — |
| B24 | Analog Volt 9 | — | — | — | — | — | — | — | — |
| B25 | System Ground | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
| B26 | Aux 10 | — | — | — | — | — | — | — | — |
| B27 | CAN 2 H | — | — | — | — | — | — | — | — |
| B28 | CAN 2 L | — | — | — | — | — | — | — | — |
| B29 | Digital Input 8 | — | W52 | — | 0.5 | OEM-3-P | — | — | — |
| B3 | Injector 6 | — | W38 | — | 0.5 | OEM-4-Q | — | — | — |
| B30 | Digital Input 7 | — | W51 | — | 0.5 | OEM-3-L | — | — | — |
| B31 | Analog Volt 10 | — | — | — | — | — | — | — | — |
| B32 | Analog Volt 11 | — | — | — | — | — | — | — | — |
| B33 | Analog Volt 5 | — | W42 | — | 0.5 | OEM-3-C | — | — | — |
| B34 | System Ground | — | W11 | — | 0.85 | SP-GND-1 | — | — | — |
| B4 | Injector 5 | — | W37 | — | 0.5 | OEM-4-P | — | — | — |
| B5 | Aux 9/10 E-Throttle Supply | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| B6 | Analog Temp 3 | — | — | — | — | — | — | — | — |
| B7 | Analog Temp 4 | — | — | — | — | — | — | — | — |
| B8 | Knock 2 | — | — | — | — | — | — | — | — |
| B9 | Knock 1 | — | — | — | — | — | — | — | — |
OEM-1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Cooling fan relay (low-side) | — | W29 | — | 0.5 | G4XXTREMEX-A-A21 | — | — | — |
| B | A/C condenser fan relay | — | W30 | — | 0.5 | G4XXTREMEX-A-A20 | — | — | — |
| C | Starter input (12V while cranking) | — | W47 | — | 0.5 | G4XXTREMEX-A-A23 | — | — | — |
| E | Check engine light (MIL) | — | W34 | — | 0.5 | G4XXTREMEX-A-A28 | — | — | — |
| G | A/C clutch relay | — | W31 | — | 0.5 | G4XXTREMEX-A-A19 | — | — | — |
| K | A/C pressure switch (A/C request) | — | W48 | — | 0.5 | G4XXTREMEX-B-B21 | — | — | — |
| L | Clutch switch | — | W49 | — | 0.5 | G4XXTREMEX-B-B20 | — | — | — |
| M | Vehicle speed sensor (VSS) | — | W46 | — | 0.5 | G4XXTREMEX-A-A31 | — | — | — |
| Q | Brake switch | — | W50 | — | 0.5 | G4XXTREMEX-B-B19 | — | — | — |
| U | Fuel pump relay (low-side) | — | W32 | — | 0.5 | G4XXTREMEX-A-A18 | — | — | — |
OEM-3
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| B | MAF sensor input | — | W26 | — | 0.5 | G4XXTREMEX-A-A17 | — | — | — |
| C | Front O2 sensor input | — | W42 | — | 0.5 | G4XXTREMEX-B-B33 | — | — | — |
| D | Rear O2 sensor input | — | W43 | — | 0.5 | G4XXTREMEX-B-B15 | — | — | — |
| F | Throttle position (TPS) | — | W27 | — | 0.5 | G4XXTREMEX-A-A22 | — | — | — |
| G | Engine coolant temp (CLT) | — | W28 | — | 0.5 | G4XXTREMEX-A-A15 | — | — | — |
| H | EGR boost sensor | — | W40 | — | 0.5 | G4XXTREMEX-A-A33 | — | — | — |
| I | +5V sensor reference | — | W16 | — | 0.5 | G4XXTREMEX-A-A32 | — | — | — |
| J | EGR valve position sensor | — | W45 | — | 0.5 | G4XXTREMEX-B-B16 | — | — | — |
| K | Intake air temp (IAT) | — | W44 | — | 0.5 | G4XXTREMEX-A-A16 | — | — | — |
| L | Idle switch (closed throttle) | — | W51 | — | 0.5 | G4XXTREMEX-B-B30 | — | — | — |
| M | Front O2 heater control | — | W33 | — | 0.5 | G4XXTREMEX-A-A29 | — | — | — |
| N | EGR boost sensor (2nd channel) | — | W41 | — | 0.5 | G4XXTREMEX-A-A14 | — | — | — |
| O | Sensor ground | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| P | Power steering pressure switch | — | W52 | — | 0.5 | G4XXTREMEX-B-B29 | — | — | — |
OEM-4
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Chassis ground | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| B | ECU power +12V (main relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| C | Chassis ground | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| D | Chassis ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| E | Crank position (CKP) sensor | — | W17 | — | 0.5 | G4XXTREMEX-A-A8 | — | — | — |
| F | CAS SGT (cam trigger) | — | W19 | — | 0.5 | G4XXTREMEX-A-A30 | — | — | — |
| G | CAS SGC (cam sync) | — | W18 | — | 0.5 | G4XXTREMEX-A-A9 | — | — | — |
| H | Crank pickup timing ground (CKP gnd) | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| I | Permanent +12V (battery) | — | — | — | — | — | — | — | — |
| J | PRC solenoid (FPR control) | — | W35 | — | 0.5 | G4XXTREMEX-A-A27 | — | — | — |
| K | Chassis ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| L | Tachometer output | — | — | — | — | — | — | — | — |
| N | Ignition coil trigger (cyl 1&4) | — | W20 | — | 0.5 | G4XXTREMEX-A-A13 | — | — | — |
| O | EGR vent solenoid | — | W36 | — | 0.5 | G4XXTREMEX-A-A26 | — | — | — |
| P | EGR vacuum solenoid | — | W37 | — | 0.5 | G4XXTREMEX-B-B4 | — | — | — |
| Q | Idle air control (IAC) valve | — | W38 | — | 0.5 | G4XXTREMEX-B-B3 | — | — | — |
| R | Ignition coil trigger (cyl 2&3) | — | W21 | — | 0.5 | G4XXTREMEX-A-A12 | — | — | — |
| T | EVAP purge solenoid | — | W39 | — | 0.5 | G4XXTREMEX-B-B2 | — | — | — |
| U | Injector 1 (cyl 1) | — | W22 | — | 0.5 | G4XXTREMEX-A-A4 | — | — | — |
| V | Injector 2 (cyl 2) | — | W23 | — | 0.5 | G4XXTREMEX-A-A3 | — | — | — |
| W | Injector 3 (cyl 3) | — | W24 | — | 0.5 | G4XXTREMEX-A-A2 | — | — | — |
| X | Injector 4 (cyl 4) | — | W25 | — | 0.5 | G4XXTREMEX-A-A1 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W12 | — | 0.5 | OEM-3-O | — | — | — |
| 1 | — | — | W13 | — | 0.5 | OEM-4-H | — | — | — |
| 1 | — | — | W14 | — | 0.5 | G4XXTREMEX-A-A24 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | G4XXTREMEX-B-B22 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-4-B | — | — | — |
| 1 | — | — | W2 | — | 0.85 | G4XXTREMEX-A-A5 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | G4XXTREMEX-B-B5 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W4 | — | 0.85 | OEM-4-A | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-4-C | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-4-D | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-4-K | — | — | — |
| 1 | — | — | W8 | — | 0.85 | G4XXTREMEX-A-A25 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | G4XXTREMEX-A-A34 | — | — | — |
| 1 | — | — | W10 | — | 0.85 | G4XXTREMEX-B-B25 | — | — | — |
| 1 | — | — | W11 | — | 0.85 | G4XXTREMEX-B-B34 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-1-A | Cooling fan relay (low-side) | low_side_out | G4XXTREMEX-A-A21 | Aux 1 | low_side_out | corroborated | |
| OEM-1-B | A/C condenser fan relay | low_side_out | G4XXTREMEX-A-A20 | Aux 2 | low_side_out | corroborated | |
| OEM-1-C | Starter input (12V while cranking) | digital_in | G4XXTREMEX-A-A23 | Digital Input 3 | digital_in | corroborated | |
| OEM-1-E | Check engine light (MIL) | low_side_out | G4XXTREMEX-A-A28 | Aux 6 | switch_out | corroborated | |
| OEM-1-G | A/C clutch relay | low_side_out | G4XXTREMEX-A-A19 | Aux 3 | low_side_out | corroborated | |
| OEM-1-K | A/C pressure switch (A/C request) | digital_in | G4XXTREMEX-B-B21 | Digital Input 4 | digital_in | corroborated | |
| OEM-1-L | Clutch switch | digital_in | G4XXTREMEX-B-B20 | Digital Input 5 | digital_in | corroborated | |
| OEM-1-M | Vehicle speed sensor (VSS) | digital_in | G4XXTREMEX-A-A31 | Digital Input 2 | digital_in | corroborated | |
| OEM-1-Q | Brake switch | digital_in | G4XXTREMEX-B-B19 | Digital Input 6 | digital_in | corroborated | |
| OEM-1-U | Fuel pump relay (low-side) | low_side_out | G4XXTREMEX-A-A18 | Aux 4 | low_side_out | corroborated | |
| OEM-3-B | MAF sensor input | analog_in | G4XXTREMEX-A-A17 | Analog Volt 1 | analog_in | corroborated | |
| OEM-3-C | Front O2 sensor input | lambda_nb_in | G4XXTREMEX-B-B33 | Analog Volt 5 | analog_in | corroborated | |
| OEM-3-D | Rear O2 sensor input | lambda_nb_in | G4XXTREMEX-B-B15 | Analog Volt 6 | analog_in | corroborated | |
| OEM-3-F | Throttle position (TPS) | analog_in | G4XXTREMEX-A-A22 | Analog Volt 2 | analog_in | corroborated | |
| OEM-3-G | Engine coolant temp (CLT) | temp_in | G4XXTREMEX-A-A15 | Analog Temp 1 | temp_in | corroborated | |
| OEM-3-H | EGR boost sensor | analog_in | G4XXTREMEX-A-A33 | Analog Volt 3 | analog_in | corroborated | |
| OEM-3-I | +5V sensor reference | vref | G4XXTREMEX-A-A32 | +5V Out | vref | corroborated | |
| OEM-3-J | EGR valve position sensor | analog_in | G4XXTREMEX-B-B16 | Analog Volt 7 | analog_in | corroborated | |
| OEM-3-K | Intake air temp (IAT) | temp_in | G4XXTREMEX-A-A16 | Analog Temp 2 | temp_in | corroborated | |
| OEM-3-L | Idle switch (closed throttle) | digital_in | G4XXTREMEX-B-B30 | Digital Input 7 | digital_in | corroborated | |
| OEM-3-M | Front O2 heater control | low_side_out | G4XXTREMEX-A-A29 | Aux 5 | switch_out | corroborated | |
| OEM-3-N | EGR boost sensor (2nd channel) | analog_in | G4XXTREMEX-A-A14 | Analog Volt 4 | analog_in | corroborated | |
| OEM-3-O | Sensor ground | sensor_ground | G4XXTREMEX-A-A24 + G4XXTREMEX-B-B22 | Sensor Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-3-P | Power steering pressure switch | digital_in | G4XXTREMEX-B-B29 | Digital Input 8 | digital_in | corroborated | |
| OEM-4-A | Chassis ground | ground | G4XXTREMEX-A-A25 + G4XXTREMEX-A-A34 + G4XXTREMEX-B-B25 + G4XXTREMEX-B-B34 | System Ground + System Ground + System Ground + System Ground | ground | corroborated | |
| OEM-4-B | ECU power +12V (main relay) | power_in | G4XXTREMEX-A-A5 + G4XXTREMEX-B-B5 | +14V ECU Power + Aux 9/10 E-Throttle Supply | power_in | corroborated | |
| OEM-4-C | Chassis ground | ground | G4XXTREMEX-A-A25 + G4XXTREMEX-A-A34 + G4XXTREMEX-B-B25 + G4XXTREMEX-B-B34 | System Ground + System Ground + System Ground + System Ground | ground | corroborated | |
| OEM-4-D | Chassis ground | ground | G4XXTREMEX-A-A25 + G4XXTREMEX-A-A34 + G4XXTREMEX-B-B25 + G4XXTREMEX-B-B34 | System Ground + System Ground + System Ground + System Ground | ground | corroborated | |
| OEM-4-E | Crank position (CKP) sensor | trigger_in | G4XXTREMEX-A-A8 | Trigger 1 | trigger_in | corroborated | |
| OEM-4-F | CAS SGT (cam trigger) | trigger_in | G4XXTREMEX-A-A30 | Digital Input 1 | digital_in | corroborated | |
| OEM-4-G | CAS SGC (cam sync) | trigger_in | G4XXTREMEX-A-A9 | Trigger 2 | trigger_in | corroborated | |
| OEM-4-H | Crank pickup timing ground (CKP gnd) | sensor_ground | G4XXTREMEX-A-A24 + G4XXTREMEX-B-B22 | Sensor Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-4-I | Permanent +12V (battery) | power_in | — | — | — | corroborated | |
| OEM-4-J | PRC solenoid (FPR control) | low_side_out | G4XXTREMEX-A-A27 | Aux 7 | switch_out | corroborated | |
| OEM-4-K | Chassis ground | ground | G4XXTREMEX-A-A25 + G4XXTREMEX-A-A34 + G4XXTREMEX-B-B25 + G4XXTREMEX-B-B34 | System Ground + System Ground + System Ground + System Ground | ground | corroborated | |
| OEM-4-L | Tachometer output | tacho_out | — | — | — | corroborated | |
| OEM-4-N | Ignition coil trigger (cyl 1&4) | ignition_out | G4XXTREMEX-A-A13 | Ignition 1 | ignition_out | corroborated | |
| OEM-4-O | EGR vent solenoid | low_side_out | G4XXTREMEX-A-A26 | Aux 8 | switch_out | corroborated | |
| OEM-4-P | EGR vacuum solenoid | low_side_out | G4XXTREMEX-B-B4 | Injector 5 | injector_out | corroborated | |
| OEM-4-Q | Idle air control (IAC) valve | low_side_out | G4XXTREMEX-B-B3 | Injector 6 | injector_out | corroborated | |
| OEM-4-R | Ignition coil trigger (cyl 2&3) | ignition_out | G4XXTREMEX-A-A12 | Ignition 2 | ignition_out | corroborated | |
| OEM-4-T | EVAP purge solenoid | low_side_out | G4XXTREMEX-B-B2 | Injector 7 | injector_out | corroborated | |
| OEM-4-U | Injector 1 (cyl 1) | injector_out | G4XXTREMEX-A-A4 | Injector 1 | injector_out | corroborated | |
| OEM-4-V | Injector 2 (cyl 2) | injector_out | G4XXTREMEX-A-A3 | Injector 2 | injector_out | corroborated | |
| OEM-4-W | Injector 3 (cyl 3) | injector_out | G4XXTREMEX-A-A2 | Injector 3 | injector_out | corroborated | |
| OEM-4-X | Injector 4 (cyl 4) | injector_out | G4XXTREMEX-A-A1 | Injector 4 | injector_out | corroborated |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-4-B | SP-14V-1 | 0.85 | no route | ECU power +12V (main relay) | — | |
| W2 | SP-14V-1 | G4XXTREMEX-A-A5 | 0.85 | no route | +14V ECU Power | — | |
| W3 | SP-14V-1 | G4XXTREMEX-B-B5 | 0.85 | no route | Aux 9/10 E-Throttle Supply | — | |
| W4 | OEM-4-A | SP-GND-1 | 0.85 | no route | Chassis ground | — | |
| W5 | OEM-4-C | SP-GND-1 | 0.85 | no route | Chassis ground | — | |
| W6 | OEM-4-D | SP-GND-1 | 0.85 | no route | Chassis ground | — | |
| W7 | OEM-4-K | SP-GND-1 | 0.85 | no route | Chassis ground | — | |
| W8 | SP-GND-1 | G4XXTREMEX-A-A25 | 0.85 | no route | System Ground | — | |
| W9 | SP-GND-1 | G4XXTREMEX-A-A34 | 0.85 | no route | System Ground | — | |
| W10 | SP-GND-1 | G4XXTREMEX-B-B25 | 0.85 | no route | System Ground | — | |
| W11 | SP-GND-1 | G4XXTREMEX-B-B34 | 0.85 | no route | System Ground | — | |
| W12 | OEM-3-O | SP-0V-1 | 0.5 | no route | Sensor ground | — | |
| W13 | OEM-4-H | SP-0V-1 | 0.5 | no route | Crank pickup timing ground (CKP gnd) | — | |
| W14 | SP-0V-1 | G4XXTREMEX-A-A24 | 0.5 | no route | Sensor Ground | — | |
| W15 | SP-0V-1 | G4XXTREMEX-B-B22 | 0.5 | no route | Sensor Ground | — | |
| W16 | OEM-3-I | G4XXTREMEX-A-A32 | 0.5 | no route | +5V sensor reference | — | |
| W17 | OEM-4-E | G4XXTREMEX-A-A8 | 0.5 | no route | Crank position (CKP) sensor | — | |
| W18 | OEM-4-G | G4XXTREMEX-A-A9 | 0.5 | no route | CAS SGC (cam sync) | — | |
| W19 | OEM-4-F | G4XXTREMEX-A-A30 | 0.5 | no route | CAS SGT (cam trigger) | — | |
| W20 | OEM-4-N | G4XXTREMEX-A-A13 | 0.5 | no route | Ignition coil trigger (cyl 1&4) | — | |
| W21 | OEM-4-R | G4XXTREMEX-A-A12 | 0.5 | no route | Ignition coil trigger (cyl 2&3) | — | |
| W22 | OEM-4-U | G4XXTREMEX-A-A4 | 0.5 | no route | Injector 1 (cyl 1) | — | |
| W23 | OEM-4-V | G4XXTREMEX-A-A3 | 0.5 | no route | Injector 2 (cyl 2) | — | |
| W24 | OEM-4-W | G4XXTREMEX-A-A2 | 0.5 | no route | Injector 3 (cyl 3) | — | |
| W25 | OEM-4-X | G4XXTREMEX-A-A1 | 0.5 | no route | Injector 4 (cyl 4) | — | |
| W26 | OEM-3-B | G4XXTREMEX-A-A17 | 0.5 | no route | MAF sensor input | — | |
| W27 | OEM-3-F | G4XXTREMEX-A-A22 | 0.5 | no route | Throttle position (TPS) | — | |
| W28 | OEM-3-G | G4XXTREMEX-A-A15 | 0.5 | no route | Engine coolant temp (CLT) | — | |
| W29 | OEM-1-A | G4XXTREMEX-A-A21 | 0.5 | no route | Cooling fan relay (low-side) | — | |
| W30 | OEM-1-B | G4XXTREMEX-A-A20 | 0.5 | no route | A/C condenser fan relay | — | |
| W31 | OEM-1-G | G4XXTREMEX-A-A19 | 0.5 | no route | A/C clutch relay | — | |
| W32 | OEM-1-U | G4XXTREMEX-A-A18 | 0.5 | no route | Fuel pump relay (low-side) | — | |
| W33 | OEM-3-M | G4XXTREMEX-A-A29 | 0.5 | no route | Front O2 heater control | — | |
| W34 | OEM-1-E | G4XXTREMEX-A-A28 | 0.5 | no route | Check engine light (MIL) | — | |
| W35 | OEM-4-J | G4XXTREMEX-A-A27 | 0.5 | no route | PRC solenoid (FPR control) | — | |
| W36 | OEM-4-O | G4XXTREMEX-A-A26 | 0.5 | no route | EGR vent solenoid | — | |
| W37 | OEM-4-P | G4XXTREMEX-B-B4 | 0.5 | no route | EGR vacuum solenoid | — | |
| W38 | OEM-4-Q | G4XXTREMEX-B-B3 | 0.5 | no route | Idle air control (IAC) valve | — | |
| W39 | OEM-4-T | G4XXTREMEX-B-B2 | 0.5 | no route | EVAP purge solenoid | — | |
| W40 | OEM-3-H | G4XXTREMEX-A-A33 | 0.5 | no route | EGR boost sensor | — | |
| W41 | OEM-3-N | G4XXTREMEX-A-A14 | 0.5 | no route | EGR boost sensor (2nd channel) | — | |
| W42 | OEM-3-C | G4XXTREMEX-B-B33 | 0.5 | no route | Front O2 sensor input | — | |
| W43 | OEM-3-D | G4XXTREMEX-B-B15 | 0.5 | no route | Rear O2 sensor input | — | |
| W44 | OEM-3-K | G4XXTREMEX-A-A16 | 0.5 | no route | Intake air temp (IAT) | — | |
| W45 | OEM-3-J | G4XXTREMEX-B-B16 | 0.5 | no route | EGR valve position sensor | — | |
| W46 | OEM-1-M | G4XXTREMEX-A-A31 | 0.5 | no route | Vehicle speed sensor (VSS) | — | |
| W47 | OEM-1-C | G4XXTREMEX-A-A23 | 0.5 | no route | Starter input (12V while cranking) | — | |
| W48 | OEM-1-K | G4XXTREMEX-B-B21 | 0.5 | no route | A/C pressure switch (A/C request) | — | |
| W49 | OEM-1-L | G4XXTREMEX-B-B20 | 0.5 | no route | Clutch switch | — | |
| W50 | OEM-1-Q | G4XXTREMEX-B-B19 | 0.5 | no route | Brake switch | — | |
| W51 | OEM-3-L | G4XXTREMEX-B-B30 | 0.5 | no route | Idle switch (closed throttle) | — | |
| W52 | OEM-3-P | G4XXTREMEX-B-B29 | 0.5 | no route | Power steering pressure switch | — |
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 (13)
| Severity | Code | Subject | Message |
|---|---|---|---|
| warn | LOAD_UNKNOWN | G4XXTREMEX-A-A18 | G4XXTREMEX-A-A18 "Aux 4" drives OEM-1-U Fuel pump relay (low-side) (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | G4XXTREMEX-A-A19 | G4XXTREMEX-A-A19 "Aux 3" drives OEM-1-G A/C clutch relay (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | G4XXTREMEX-A-A20 | G4XXTREMEX-A-A20 "Aux 2" drives OEM-1-B A/C condenser fan relay (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | G4XXTREMEX-A-A21 | G4XXTREMEX-A-A21 "Aux 1" drives OEM-1-A Cooling fan relay (low-side) (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | NET_FAMILY | OEM-4-F ↔ G4XXTREMEX-A-A30 | OEM-4-F "CAS SGT (cam trigger)" [trigger_in] is wired to G4XXTREMEX-A-A30 "Digital Input 1" [digital_in]. Hall-type cam/speed signals can use a digital input if it handles the frequency; VR signals cannot. |
| info | NET_FAMILY | OEM-1-E ↔ G4XXTREMEX-A-A28 | OEM-1-E "Check engine light (MIL)" [low_side_out] is wired to G4XXTREMEX-A-A28 "Aux 6" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-3-M ↔ G4XXTREMEX-A-A29 | OEM-3-M "Front O2 heater control" [low_side_out] is wired to G4XXTREMEX-A-A29 "Aux 5" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-4-J ↔ G4XXTREMEX-A-A27 | OEM-4-J "PRC solenoid (FPR control)" [low_side_out] is wired to G4XXTREMEX-A-A27 "Aux 7" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-4-O ↔ G4XXTREMEX-A-A26 | OEM-4-O "EGR vent solenoid" [low_side_out] is wired to G4XXTREMEX-A-A26 "Aux 8" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-4-P ↔ G4XXTREMEX-B-B4 | OEM-4-P "EGR vacuum solenoid" [low_side_out] is wired to G4XXTREMEX-B-B4 "Injector 5" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-4-Q ↔ G4XXTREMEX-B-B3 | OEM-4-Q "Idle air control (IAC) valve" [low_side_out] is wired to G4XXTREMEX-B-B3 "Injector 6" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-4-T ↔ G4XXTREMEX-B-B2 | OEM-4-T "EVAP purge solenoid" [low_side_out] is wired to G4XXTREMEX-B-B2 "Injector 7" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | UNMAPPED | OEM | 1 optional OEM pins are not mapped: OEM-4-L Tachometer output |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-4-I | Battery-constant (memory) feed of the stock ECU: the new ECU has no such input, so it is not needed. | mapping-proposal |
Notes
Auto-mapped by auto_map() from the library pin data on 2026-10-11. Review every wire against both manuals before building. Not wired: - OEM-4 I: Permanent +12V (battery): Link G4X XtremeX has no battery-constant input; not needed - OEM-4 L: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on Link G4X XtremeX
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | AEM EMS 30-1720 Plug-and-Play adapter manual (1996-97 Miata) | https://static.summitracing.com/global/images/instructions/avm-30-1720.pdf | — | — | — |
| 4 | vendor_doc | Link: G4X XtremeX quickstart guide | https://linkecu.com/documentation/XtremeXQuickstartGuide.pdf | — | — | — |
| 3 | community_copy | Mellens.net: 1996 Mazda Miata wiring diagrams (FSM-derived) | http://www.mellens.net/mazda/mazda_miata_extra_manual/1996_wiring.pdf | — | — | — |
| 3 | community_copy | YourSpec: Link G4X XtremeX flying-lead harness wiring list | https://wpm.yourspec.com/projects/view/1488 | — | — | — |