MX-5 Miata NA8 1996-97 (BP-ZE, 1.8, OBD-II) → Link G4X MonsoonX (auto)
MX-5 Miata NA8 1996-97 (BP-ZE, 1.8, OBD-II) — Link — G4X MonsoonX
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 | 35 wires · 7 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 | G4XMONSOONX-A-A5 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | OEM-4-A | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-4-C | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-4-D | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-4-K | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | SP-GND-1 | G4XMONSOONX-A-A25 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | G4XMONSOONX-A-A34 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-3-O | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-4-H | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-0V-1 | G4XMONSOONX-A-A24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-3-I | G4XMONSOONX-A-A32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-4-E | G4XMONSOONX-A-A8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-4-G | G4XMONSOONX-A-A9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-4-F | G4XMONSOONX-A-A30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-4-N | G4XMONSOONX-A-A13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-4-R | G4XMONSOONX-A-A12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-4-U | G4XMONSOONX-A-A4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-4-V | G4XMONSOONX-A-A3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-4-W | G4XMONSOONX-A-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-4-X | G4XMONSOONX-A-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-3-B | G4XMONSOONX-A-A17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-3-F | G4XMONSOONX-A-A22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-3-G | G4XMONSOONX-A-A15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-1-A | G4XMONSOONX-A-A21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-1-B | G4XMONSOONX-A-A20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-1-G | G4XMONSOONX-A-A19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-1-U | G4XMONSOONX-A-A18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-3-M | G4XMONSOONX-A-A27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-1-E | G4XMONSOONX-A-A26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-3-H | G4XMONSOONX-A-A33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-3-N | G4XMONSOONX-A-A14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-3-K | G4XMONSOONX-A-A16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-1-M | G4XMONSOONX-A-A31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-1-C | G4XMONSOONX-A-A23 | 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 | G4XMONSOONX-A-A32 | G4XMONSOONX-A-A24 | open (OL) | 5 V sensor reference must not touch sensor ground | |
| 2 | G4XMONSOONX-A-A32 | G4XMONSOONX-A-A25 | open (OL) | 5 V sensor reference must not touch power ground | |
| 3 | G4XMONSOONX-A-A24 | G4XMONSOONX-A-A5 | open (OL) | sensor ground must not touch +12 V supply | |
| 4 | G4XMONSOONX-A-A25 | G4XMONSOONX-A-A5 | open (OL) | power ground must not touch +12 V supply | |
| 5 | G4XMONSOONX-A-A32 | G4XMONSOONX-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
G4XMONSOONX-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A1 | Injector 4 | — | W21 | — | 0.5 | OEM-4-X | — | — | — |
| A10 | Ignition 4 | — | — | — | — | — | — | — | — |
| A11 | Ignition 3 | — | — | — | — | — | — | — | — |
| A12 | Ignition 2 | — | W17 | — | 0.5 | OEM-4-R | — | — | — |
| A13 | Ignition 1 | — | W16 | — | 0.5 | OEM-4-N | — | — | — |
| A14 | Analog Volt 4 | — | W32 | — | 0.5 | OEM-3-N | — | — | — |
| A15 | Analog Temp 1 | — | W24 | — | 0.5 | OEM-3-G | — | — | — |
| A16 | Analog Temp 2 | — | W33 | — | 0.5 | OEM-3-K | — | — | — |
| A17 | Analog Volt 1 | — | W22 | — | 0.5 | OEM-3-B | — | — | — |
| A18 | Aux 4 | — | W28 | — | 0.5 | OEM-1-U | — | — | — |
| A19 | Aux 3 | — | W27 | — | 0.5 | OEM-1-G | — | — | — |
| A2 | Injector 3 | — | W20 | — | 0.5 | OEM-4-W | — | — | — |
| A20 | Aux 2 | — | W26 | — | 0.5 | OEM-1-B | — | — | — |
| A21 | Aux 1 | — | W25 | — | 0.5 | OEM-1-A | — | — | — |
| A22 | Analog Volt 2 | — | W23 | — | 0.5 | OEM-3-F | — | — | — |
| A23 | Digital Input 3 | — | W35 | — | 0.5 | OEM-1-C | — | — | — |
| A24 | Sensor Ground | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| A25 | System Ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| A26 | Aux 6 | — | W30 | — | 0.5 | OEM-1-E | — | — | — |
| A27 | Aux 5 | — | W29 | — | 0.5 | OEM-3-M | — | — | — |
| A28 | CAN H | — | — | — | — | — | — | — | — |
| A29 | CAN L | — | — | — | — | — | — | — | — |
| A3 | Injector 2 | — | W19 | — | 0.5 | OEM-4-V | — | — | — |
| A30 | Digital Input 1 | — | W15 | — | 0.5 | OEM-4-F | — | — | — |
| A31 | Digital Input 2 | — | W34 | — | 0.5 | OEM-1-M | — | — | — |
| A32 | +5V Out | — | W12 | — | 0.5 | OEM-3-I | — | — | — |
| A33 | Analog Volt 3 | — | W31 | — | 0.5 | OEM-3-H | — | — | — |
| A34 | System Ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| A4 | Injector 1 | — | W18 | — | 0.5 | OEM-4-U | — | — | — |
| A5 | +14V ECU Power | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| A6 | Knock 1 / Digital Input 4 | — | — | — | — | — | — | — | — |
| A7 | Shield Ground | — | — | — | — | — | — | — | — |
| A8 | Trigger 1 | — | W13 | — | 0.5 | OEM-4-E | — | — | — |
| A9 | Trigger 2 | — | W14 | — | 0.5 | OEM-4-G | — | — | — |
OEM-1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Cooling fan relay (low-side) | — | W25 | — | 0.5 | G4XMONSOONX-A-A21 | — | — | — |
| B | A/C condenser fan relay | — | W26 | — | 0.5 | G4XMONSOONX-A-A20 | — | — | — |
| C | Starter input (12V while cranking) | — | W35 | — | 0.5 | G4XMONSOONX-A-A23 | — | — | — |
| E | Check engine light (MIL) | — | W30 | — | 0.5 | G4XMONSOONX-A-A26 | — | — | — |
| G | A/C clutch relay | — | W27 | — | 0.5 | G4XMONSOONX-A-A19 | — | — | — |
| K | A/C pressure switch (A/C request) | — | — | — | — | — | — | — | — |
| L | Clutch switch | — | — | — | — | — | — | — | — |
| M | Vehicle speed sensor (VSS) | — | W34 | — | 0.5 | G4XMONSOONX-A-A31 | — | — | — |
| Q | Brake switch | — | — | — | — | — | — | — | — |
| U | Fuel pump relay (low-side) | — | W28 | — | 0.5 | G4XMONSOONX-A-A18 | — | — | — |
OEM-3
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| B | MAF sensor input | — | W22 | — | 0.5 | G4XMONSOONX-A-A17 | — | — | — |
| C | Front O2 sensor input | — | — | — | — | — | — | — | — |
| D | Rear O2 sensor input | — | — | — | — | — | — | — | — |
| F | Throttle position (TPS) | — | W23 | — | 0.5 | G4XMONSOONX-A-A22 | — | — | — |
| G | Engine coolant temp (CLT) | — | W24 | — | 0.5 | G4XMONSOONX-A-A15 | — | — | — |
| H | EGR boost sensor | — | W31 | — | 0.5 | G4XMONSOONX-A-A33 | — | — | — |
| I | +5V sensor reference | — | W12 | — | 0.5 | G4XMONSOONX-A-A32 | — | — | — |
| J | EGR valve position sensor | — | — | — | — | — | — | — | — |
| K | Intake air temp (IAT) | — | W33 | — | 0.5 | G4XMONSOONX-A-A16 | — | — | — |
| L | Idle switch (closed throttle) | — | — | — | — | — | — | — | — |
| M | Front O2 heater control | — | W29 | — | 0.5 | G4XMONSOONX-A-A27 | — | — | — |
| N | EGR boost sensor (2nd channel) | — | W32 | — | 0.5 | G4XMONSOONX-A-A14 | — | — | — |
| O | Sensor ground | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| P | Power steering pressure switch | — | — | — | — | — | — | — | — |
OEM-4
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Chassis ground | — | W3 | — | 0.85 | SP-GND-1 | — | — | — |
| B | ECU power +12V (main relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| C | Chassis ground | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| D | Chassis ground | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| E | Crank position (CKP) sensor | — | W13 | — | 0.5 | G4XMONSOONX-A-A8 | — | — | — |
| F | CAS SGT (cam trigger) | — | W15 | — | 0.5 | G4XMONSOONX-A-A30 | — | — | — |
| G | CAS SGC (cam sync) | — | W14 | — | 0.5 | G4XMONSOONX-A-A9 | — | — | — |
| H | Crank pickup timing ground (CKP gnd) | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| I | Permanent +12V (battery) | — | — | — | — | — | — | — | — |
| J | PRC solenoid (FPR control) | — | — | — | — | — | — | — | — |
| K | Chassis ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| L | Tachometer output | — | — | — | — | — | — | — | — |
| N | Ignition coil trigger (cyl 1&4) | — | W16 | — | 0.5 | G4XMONSOONX-A-A13 | — | — | — |
| O | EGR vent solenoid | — | — | — | — | — | — | — | — |
| P | EGR vacuum solenoid | — | — | — | — | — | — | — | — |
| Q | Idle air control (IAC) valve | — | — | — | — | — | — | — | — |
| R | Ignition coil trigger (cyl 2&3) | — | W17 | — | 0.5 | G4XMONSOONX-A-A12 | — | — | — |
| T | EVAP purge solenoid | — | — | — | — | — | — | — | — |
| U | Injector 1 (cyl 1) | — | W18 | — | 0.5 | G4XMONSOONX-A-A4 | — | — | — |
| V | Injector 2 (cyl 2) | — | W19 | — | 0.5 | G4XMONSOONX-A-A3 | — | — | — |
| W | Injector 3 (cyl 3) | — | W20 | — | 0.5 | G4XMONSOONX-A-A2 | — | — | — |
| X | Injector 4 (cyl 4) | — | W21 | — | 0.5 | G4XMONSOONX-A-A1 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W9 | — | 0.5 | OEM-3-O | — | — | — |
| 1 | — | — | W10 | — | 0.5 | OEM-4-H | — | — | — |
| 1 | — | — | W11 | — | 0.5 | G4XMONSOONX-A-A24 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-4-B | — | — | — |
| 1 | — | — | W2 | — | 0.85 | G4XMONSOONX-A-A5 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W3 | — | 0.85 | OEM-4-A | — | — | — |
| 1 | — | — | W4 | — | 0.85 | OEM-4-C | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-4-D | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-4-K | — | — | — |
| 1 | — | — | W7 | — | 0.85 | G4XMONSOONX-A-A25 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | G4XMONSOONX-A-A34 | — | — | — |
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 | G4XMONSOONX-A-A21 | Aux 1 | low_side_out | corroborated | |
| OEM-1-B | A/C condenser fan relay | low_side_out | G4XMONSOONX-A-A20 | Aux 2 | low_side_out | corroborated | |
| OEM-1-C | Starter input (12V while cranking) | digital_in | G4XMONSOONX-A-A23 | Digital Input 3 | digital_in | corroborated | |
| OEM-1-E | Check engine light (MIL) | low_side_out | G4XMONSOONX-A-A26 | Aux 6 | low_side_out | corroborated | |
| OEM-1-G | A/C clutch relay | low_side_out | G4XMONSOONX-A-A19 | Aux 3 | low_side_out | corroborated | |
| OEM-1-K | A/C pressure switch (A/C request) | digital_in | — | — | — | corroborated | |
| OEM-1-L | Clutch switch | digital_in | — | — | — | corroborated | |
| OEM-1-M | Vehicle speed sensor (VSS) | digital_in | G4XMONSOONX-A-A31 | Digital Input 2 | digital_in | corroborated | |
| OEM-1-Q | Brake switch | digital_in | — | — | — | corroborated | |
| OEM-1-U | Fuel pump relay (low-side) | low_side_out | G4XMONSOONX-A-A18 | Aux 4 | low_side_out | corroborated | |
| OEM-3-B | MAF sensor input | analog_in | G4XMONSOONX-A-A17 | Analog Volt 1 | analog_in | corroborated | |
| OEM-3-C | Front O2 sensor input | lambda_nb_in | — | — | — | corroborated | |
| OEM-3-D | Rear O2 sensor input | lambda_nb_in | — | — | — | corroborated | |
| OEM-3-F | Throttle position (TPS) | analog_in | G4XMONSOONX-A-A22 | Analog Volt 2 | analog_in | corroborated | |
| OEM-3-G | Engine coolant temp (CLT) | temp_in | G4XMONSOONX-A-A15 | Analog Temp 1 | temp_in | corroborated | |
| OEM-3-H | EGR boost sensor | analog_in | G4XMONSOONX-A-A33 | Analog Volt 3 | analog_in | corroborated | |
| OEM-3-I | +5V sensor reference | vref | G4XMONSOONX-A-A32 | +5V Out | vref | corroborated | |
| OEM-3-J | EGR valve position sensor | analog_in | — | — | — | corroborated | |
| OEM-3-K | Intake air temp (IAT) | temp_in | G4XMONSOONX-A-A16 | Analog Temp 2 | temp_in | corroborated | |
| OEM-3-L | Idle switch (closed throttle) | digital_in | — | — | — | corroborated | |
| OEM-3-M | Front O2 heater control | low_side_out | G4XMONSOONX-A-A27 | Aux 5 | low_side_out | corroborated | |
| OEM-3-N | EGR boost sensor (2nd channel) | analog_in | G4XMONSOONX-A-A14 | Analog Volt 4 | analog_in | corroborated | |
| OEM-3-O | Sensor ground | sensor_ground | G4XMONSOONX-A-A24 | Sensor Ground | sensor_ground | corroborated | |
| OEM-3-P | Power steering pressure switch | digital_in | — | — | — | corroborated | |
| OEM-4-A | Chassis ground | ground | G4XMONSOONX-A-A25 + G4XMONSOONX-A-A34 | System Ground + System Ground | ground | corroborated | |
| OEM-4-B | ECU power +12V (main relay) | power_in | G4XMONSOONX-A-A5 | +14V ECU Power | power_in | corroborated | |
| OEM-4-C | Chassis ground | ground | G4XMONSOONX-A-A25 + G4XMONSOONX-A-A34 | System Ground + System Ground | ground | corroborated | |
| OEM-4-D | Chassis ground | ground | G4XMONSOONX-A-A25 + G4XMONSOONX-A-A34 | System Ground + System Ground | ground | corroborated | |
| OEM-4-E | Crank position (CKP) sensor | trigger_in | G4XMONSOONX-A-A8 | Trigger 1 | trigger_in | corroborated | |
| OEM-4-F | CAS SGT (cam trigger) | trigger_in | G4XMONSOONX-A-A30 | Digital Input 1 | digital_in | corroborated | |
| OEM-4-G | CAS SGC (cam sync) | trigger_in | G4XMONSOONX-A-A9 | Trigger 2 | trigger_in | corroborated | |
| OEM-4-H | Crank pickup timing ground (CKP gnd) | sensor_ground | G4XMONSOONX-A-A24 | Sensor Ground | sensor_ground | corroborated | |
| OEM-4-I | Permanent +12V (battery) | power_in | — | — | — | corroborated | |
| OEM-4-J | PRC solenoid (FPR control) | low_side_out | — | — | — | corroborated | |
| OEM-4-K | Chassis ground | ground | G4XMONSOONX-A-A25 + G4XMONSOONX-A-A34 | 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 | G4XMONSOONX-A-A13 | Ignition 1 | ignition_out | corroborated | |
| OEM-4-O | EGR vent solenoid | low_side_out | — | — | — | corroborated | |
| OEM-4-P | EGR vacuum solenoid | low_side_out | — | — | — | corroborated | |
| OEM-4-Q | Idle air control (IAC) valve | low_side_out | — | — | — | corroborated | |
| OEM-4-R | Ignition coil trigger (cyl 2&3) | ignition_out | G4XMONSOONX-A-A12 | Ignition 2 | ignition_out | corroborated | |
| OEM-4-T | EVAP purge solenoid | low_side_out | — | — | — | corroborated | |
| OEM-4-U | Injector 1 (cyl 1) | injector_out | G4XMONSOONX-A-A4 | Injector 1 | injector_out | corroborated | |
| OEM-4-V | Injector 2 (cyl 2) | injector_out | G4XMONSOONX-A-A3 | Injector 2 | injector_out | corroborated | |
| OEM-4-W | Injector 3 (cyl 3) | injector_out | G4XMONSOONX-A-A2 | Injector 3 | injector_out | corroborated | |
| OEM-4-X | Injector 4 (cyl 4) | injector_out | G4XMONSOONX-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 | G4XMONSOONX-A-A5 | 0.85 | no route | +14V ECU Power | — | |
| W3 | OEM-4-A | SP-GND-1 | 0.85 | no route | Chassis ground | — | |
| W4 | OEM-4-C | SP-GND-1 | 0.85 | no route | Chassis ground | — | |
| W5 | OEM-4-D | SP-GND-1 | 0.85 | no route | Chassis ground | — | |
| W6 | OEM-4-K | SP-GND-1 | 0.85 | no route | Chassis ground | — | |
| W7 | SP-GND-1 | G4XMONSOONX-A-A25 | 0.85 | no route | System Ground | — | |
| W8 | SP-GND-1 | G4XMONSOONX-A-A34 | 0.85 | no route | System Ground | — | |
| W9 | OEM-3-O | SP-0V-1 | 0.5 | no route | Sensor ground | — | |
| W10 | OEM-4-H | SP-0V-1 | 0.5 | no route | Crank pickup timing ground (CKP gnd) | — | |
| W11 | SP-0V-1 | G4XMONSOONX-A-A24 | 0.5 | no route | Sensor Ground | — | |
| W12 | OEM-3-I | G4XMONSOONX-A-A32 | 0.5 | no route | +5V sensor reference | — | |
| W13 | OEM-4-E | G4XMONSOONX-A-A8 | 0.5 | no route | Crank position (CKP) sensor | — | |
| W14 | OEM-4-G | G4XMONSOONX-A-A9 | 0.5 | no route | CAS SGC (cam sync) | — | |
| W15 | OEM-4-F | G4XMONSOONX-A-A30 | 0.5 | no route | CAS SGT (cam trigger) | — | |
| W16 | OEM-4-N | G4XMONSOONX-A-A13 | 0.5 | no route | Ignition coil trigger (cyl 1&4) | — | |
| W17 | OEM-4-R | G4XMONSOONX-A-A12 | 0.5 | no route | Ignition coil trigger (cyl 2&3) | — | |
| W18 | OEM-4-U | G4XMONSOONX-A-A4 | 0.5 | no route | Injector 1 (cyl 1) | — | |
| W19 | OEM-4-V | G4XMONSOONX-A-A3 | 0.5 | no route | Injector 2 (cyl 2) | — | |
| W20 | OEM-4-W | G4XMONSOONX-A-A2 | 0.5 | no route | Injector 3 (cyl 3) | — | |
| W21 | OEM-4-X | G4XMONSOONX-A-A1 | 0.5 | no route | Injector 4 (cyl 4) | — | |
| W22 | OEM-3-B | G4XMONSOONX-A-A17 | 0.5 | no route | MAF sensor input | — | |
| W23 | OEM-3-F | G4XMONSOONX-A-A22 | 0.5 | no route | Throttle position (TPS) | — | |
| W24 | OEM-3-G | G4XMONSOONX-A-A15 | 0.5 | no route | Engine coolant temp (CLT) | — | |
| W25 | OEM-1-A | G4XMONSOONX-A-A21 | 0.5 | no route | Cooling fan relay (low-side) | — | |
| W26 | OEM-1-B | G4XMONSOONX-A-A20 | 0.5 | no route | A/C condenser fan relay | — | |
| W27 | OEM-1-G | G4XMONSOONX-A-A19 | 0.5 | no route | A/C clutch relay | — | |
| W28 | OEM-1-U | G4XMONSOONX-A-A18 | 0.5 | no route | Fuel pump relay (low-side) | — | |
| W29 | OEM-3-M | G4XMONSOONX-A-A27 | 0.5 | no route | Front O2 heater control | — | |
| W30 | OEM-1-E | G4XMONSOONX-A-A26 | 0.5 | no route | Check engine light (MIL) | — | |
| W31 | OEM-3-H | G4XMONSOONX-A-A33 | 0.5 | no route | EGR boost sensor | — | |
| W32 | OEM-3-N | G4XMONSOONX-A-A14 | 0.5 | no route | EGR boost sensor (2nd channel) | — | |
| W33 | OEM-3-K | G4XMONSOONX-A-A16 | 0.5 | no route | Intake air temp (IAT) | — | |
| W34 | OEM-1-M | G4XMONSOONX-A-A31 | 0.5 | no route | Vehicle speed sensor (VSS) | — | |
| W35 | OEM-1-C | G4XMONSOONX-A-A23 | 0.5 | no route | Starter input (12V while cranking) | — |
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 (6)
| Severity | Code | Subject | Message |
|---|---|---|---|
| warn | LOAD_UNKNOWN | G4XMONSOONX-A-A18 | G4XMONSOONX-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 | G4XMONSOONX-A-A19 | G4XMONSOONX-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 | G4XMONSOONX-A-A20 | G4XMONSOONX-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 | G4XMONSOONX-A-A21 | G4XMONSOONX-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 ↔ G4XMONSOONX-A-A30 | OEM-4-F "CAS SGT (cam trigger)" [trigger_in] is wired to G4XMONSOONX-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 | UNMAPPED | OEM | 14 optional OEM pins are not mapped: OEM-1-K A/C pressure switch (A/C request); OEM-1-L Clutch switch; OEM-1-Q Brake switch; OEM-3-C Front O2 sensor input; OEM-3-D Rear O2 sensor input; OEM-3-J EGR valve position sensor; OEM-3-L Idle switch (closed throttle); OEM-3-P Power steering pressure switch; OEM-4-J PRC solenoid (FPR control); OEM-4-L Tachometer output; OEM-4-O EGR vent solenoid; OEM-4-P EGR vacuum solenoid; OEM-4-Q Idle air control (IAC) valve; OEM-4-T EVAP purge solenoid |
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 MonsoonX has no battery-constant input; not needed - OEM-4 J: PRC solenoid (FPR control): no free low_side/relay_control/heater_low_side/ls_hs/injector on Link G4X MonsoonX - OEM-4 O: EGR vent solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on Link G4X MonsoonX - OEM-4 P: EGR vacuum solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on Link G4X MonsoonX - OEM-4 Q: Idle air control (IAC) valve: no free low_side/relay_control/heater_low_side/ls_hs/injector on Link G4X MonsoonX - OEM-4 T: EVAP purge solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on Link G4X MonsoonX - OEM-4 L: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on Link G4X MonsoonX - OEM-3 C: Front O2 sensor input: no free o2_narrowband/analog_0_5 on Link G4X MonsoonX - OEM-3 D: Rear O2 sensor input: no free o2_narrowband/analog_0_5 on Link G4X MonsoonX - OEM-3 J: EGR valve position sensor: no free analog_0_5 on Link G4X MonsoonX - OEM-1 K: A/C pressure switch (A/C request): no free switch_in/frequency_in/analog_0_5 on Link G4X MonsoonX - OEM-1 L: Clutch switch: no free switch_in/frequency_in/analog_0_5 on Link G4X MonsoonX - OEM-1 Q: Brake switch: no free switch_in/frequency_in/analog_0_5 on Link G4X MonsoonX - OEM-3 L: Idle switch (closed throttle): no free switch_in/frequency_in/analog_0_5 on Link G4X MonsoonX - OEM-3 P: Power steering pressure switch: no free switch_in/frequency_in/analog_0_5 on Link G4X MonsoonX
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 MonsoonX quickstart + RET 115-1000 | https://linkecu.com/documentation/MonsoonXQuickstartGuide.pdf | archive | 2026-10-05 | e8d432b273d6 |
| 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 MonsoonX flying-lead harness wiring list | https://wpm.yourspec.com/projects/view/1469 | — | — | — |