Mazda RX-7 FD 1992-2002 (13B-REW twin-turbo) → Link G4X AtomX 111-4000 (auto)
Mazda RX-7 FD 1992-2002 (13B-REW twin-turbo) — Link — G4X AtomX
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 2026-10-20
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 | none |
| Size of the job | 38 wires · 10 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-D-4A | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | OEM-D-4E | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | NEW-KEYON-1 | MAIN-R-COIL+ | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | NEW-BATT-1 | MAIN-R-IN | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | MAIN-R-COIL- | SP-GND-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | MAIN-R-OUT | G4XATOMX-A-A5 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-A-1AF | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | OEM-A-1AJ | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-A-1L | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-GND-1 | G4XATOMX-A-A25 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-GND-1 | G4XATOMX-A-A34 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-A-1AB | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-A-1X | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-C-3AB | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-C-3S | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | SP-0V-1 | G4XATOMX-A-A24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-C-3A | G4XATOMX-A-A32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-C-3R | G4XATOMX-A-A8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-C-3U | G4XATOMX-A-A9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-C-3O | G4XATOMX-A-A6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-D-4AF | G4XATOMX-A-A13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-D-4AJ | G4XATOMX-A-A12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-D-4AN | G4XATOMX-A-A11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-A-1Q | G4XATOMX-A-A4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-A-1U | G4XATOMX-A-A3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-A-1Y | G4XATOMX-A-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-A-1AC | G4XATOMX-A-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-D-4AH | G4XATOMX-A-A17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-C-3I | G4XATOMX-A-A22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-C-3W | G4XATOMX-A-A15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-A-1H | G4XATOMX-A-A21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-D-4D | G4XATOMX-A-A20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-D-4F | G4XATOMX-A-A19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-D-4G | G4XATOMX-A-A18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-C-3D | G4XATOMX-A-A33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-C-3T | G4XATOMX-A-A16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-D-4Q | G4XATOMX-A-A30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-D-4AA | G4XATOMX-A-A31 | 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 | G4XATOMX-A-A24 | G4XATOMX-A-A32 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 2 | G4XATOMX-A-A24 | G4XATOMX-A-A5 | open (OL) | sensor ground must not touch +12 V supply | |
| 3 | G4XATOMX-A-A24 | NEW-BATT-1 | open (OL) | sensor ground must not touch +12 V supply | |
| 4 | G4XATOMX-A-A24 | NEW-KEYON-1 | open (OL) | sensor ground must not touch +12 V supply | |
| 5 | G4XATOMX-A-A24 | OEM-D-4A | open (OL) | sensor ground must not touch +12 V supply | |
| 6 | G4XATOMX-A-A25 | G4XATOMX-A-A32 | open (OL) | power ground must not touch 5 V sensor reference | |
| 7 | G4XATOMX-A-A25 | G4XATOMX-A-A5 | open (OL) | power ground must not touch +12 V supply | |
| 8 | G4XATOMX-A-A25 | NEW-BATT-1 | open (OL) | power ground must not touch +12 V supply | |
| 9 | G4XATOMX-A-A25 | NEW-KEYON-1 | open (OL) | power ground must not touch +12 V supply | |
| 10 | G4XATOMX-A-A25 | OEM-D-4A | open (OL) | power ground must not touch +12 V supply | |
| 11 | G4XATOMX-A-A32 | G4XATOMX-A-A5 | open (OL) | 5 V sensor reference must not touch +12 V supply | |
| 12 | G4XATOMX-A-A32 | NEW-BATT-1 | open (OL) | 5 V sensor reference must not touch +12 V supply | |
| 13 | G4XATOMX-A-A32 | NEW-KEYON-1 | open (OL) | 5 V sensor reference must not touch +12 V supply | |
| 14 | G4XATOMX-A-A32 | OEM-D-4A | 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
G4XATOMX-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A1 | Injector 4 | — | W27 | — | 0.5 | OEM-A-1AC | — | — | — |
| A10 | Ignition 4 | — | — | — | — | — | — | — | — |
| A11 | Ignition 3 | — | W23 | — | 0.5 | OEM-D-4AN | — | — | — |
| A12 | Ignition 2 | — | W22 | — | 0.5 | OEM-D-4AJ | — | — | — |
| A13 | Ignition 1 | — | W21 | — | 0.5 | OEM-D-4AF | — | — | — |
| A15 | Analog Temp 1 | — | W30 | — | 0.5 | OEM-C-3W | — | — | — |
| A16 | Analog Temp 2 | — | W36 | — | 0.5 | OEM-C-3T | — | — | — |
| A17 | Analog Volt 1 | — | W28 | — | 0.5 | OEM-D-4AH | — | — | — |
| A18 | Aux 4 | — | W34 | — | 0.5 | OEM-D-4G | — | — | — |
| A19 | Aux 3 | — | W33 | — | 0.5 | OEM-D-4F | — | — | — |
| A2 | Injector 3 | — | W26 | — | 0.5 | OEM-A-1Y | — | — | — |
| A20 | Aux 2 | — | W32 | — | 0.5 | OEM-D-4D | — | — | — |
| A21 | Aux 1 | — | W31 | — | 0.5 | OEM-A-1H | — | — | — |
| A22 | Analog Volt 2 | — | W29 | — | 0.5 | OEM-C-3I | — | — | — |
| A24 | Sensor Ground | — | W16 | — | 0.5 | SP-0V-1 | — | — | — |
| A25 | System Ground | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
| A28 | CAN H | — | — | — | — | — | — | — | — |
| A29 | CAN L | — | — | — | — | — | — | — | — |
| A3 | Injector 2 | — | W25 | — | 0.5 | OEM-A-1U | — | — | — |
| A30 | Digital Input 1 | — | W37 | — | 0.5 | OEM-D-4Q | — | — | — |
| A31 | Digital Input 2 | — | W38 | — | 0.5 | OEM-D-4AA | — | — | — |
| A32 | +5V Out | — | W17 | — | 0.5 | OEM-C-3A | — | — | — |
| A33 | Analog Volt 3 | — | W35 | — | 0.5 | OEM-C-3D | — | — | — |
| A34 | System Ground | — | W11 | — | 0.85 | SP-GND-1 | — | — | — |
| A4 | Injector 1 | — | W24 | — | 0.5 | OEM-A-1Q | — | — | — |
| A5 | +14V ECU Power | — | W6 | — | 0.85 | MAIN-R-OUT | — | — | — |
| A6 | Knock 1 | — | W20 | — | 0.5 | OEM-C-3O | — | — | — |
| A7 | Shield Ground | — | — | — | — | — | — | — | — |
| A8 | Trigger 1 | — | W18 | — | 0.5 | OEM-C-3R | — | — | — |
| A9 | Trigger 2 | — | W19 | — | 0.5 | OEM-C-3U | — | — | — |
MAIN-R
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| COIL+ | Relay coil positive (ignition-switched +12V) | — | W3 | — | 0.5 | NEW-KEYON-1 | — | — | — |
| COIL- | Relay coil negative (ECU low-side driver) | — | W5 | — | 0.5 | SP-GND-1 | — | — | — |
| IN | Relay contact input (battery + via main fuse) | — | W4 | — | 0.85 | NEW-BATT-1 | — | — | — |
| OUT | Relay contact output (switched +12V bus) | — | W6 | — | 0.85 | G4XATOMX-A-A5 | — | — | — |
NEW-BATT
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W4 | — | 0.85 | MAIN-R-IN | — | — | — |
NEW-KEYON
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W3 | — | 0.5 | MAIN-R-COIL+ | — | — | — |
OEM-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1AA | OMP stepper phase B1 | — | — | — | — | — | — | — | — |
| 1AB | Sensor ground | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 1AC | Injector 4 (rear secondary) | — | W27 | — | 0.5 | G4XATOMX-A-A1 | — | — | — |
| 1AE | OMP stepper phase A1 | — | — | — | — | — | — | — | — |
| 1AF | Power ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 1AJ | Power ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 1C | Idle speed control (ISC) solenoid | — | — | — | — | — | — | — | — |
| 1E | Turbo charge control solenoid | — | — | — | — | — | — | — | — |
| 1G | Purge solenoid | — | — | — | — | — | — | — | — |
| 1H | Cooling fan relay (low speed) | — | W31 | — | 0.5 | G4XATOMX-A-A21 | — | — | — |
| 1I | Turbo charge relief solenoid | — | — | — | — | — | — | — | — |
| 1K | Turbo pre-control solenoid | — | — | — | — | — | — | — | — |
| 1L | Power ground | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| 1M | Turbo control solenoid | — | — | — | — | — | — | — | — |
| 1O | Boost control solenoid | — | — | — | — | — | — | — | — |
| 1Q | Injector 1 (front primary) | — | W24 | — | 0.5 | G4XATOMX-A-A4 | — | — | — |
| 1S | OMP stepper phase B2 | — | — | — | — | — | — | — | — |
| 1U | Injector 2 (rear primary) | — | W25 | — | 0.5 | G4XATOMX-A-A3 | — | — | — |
| 1W | OMP stepper phase A2 | — | — | — | — | — | — | — | — |
| 1X | Sensor ground | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 1Y | Injector 3 (front secondary) | — | W26 | — | 0.5 | G4XATOMX-A-A2 | — | — | — |
OEM-C
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 3A | +5V sensor supply | — | W17 | — | 0.5 | G4XATOMX-A-A32 | — | — | — |
| 3AB | Sensor ground | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 3D | O2 sensor (narrowband) | — | W35 | — | 0.5 | G4XATOMX-A-A33 | — | — | — |
| 3G | Fuel pressure regulator control (PRC) solenoid | — | — | — | — | — | — | — | — |
| 3H | OMP position sensor | — | — | — | — | — | — | — | — |
| 3I | Throttle position (TPS, full range) | — | W29 | — | 0.5 | G4XATOMX-A-A22 | — | — | — |
| 3O | Knock sensor | — | W20 | — | 0.5 | G4XATOMX-A-A6 | — | — | — |
| 3R | Crank position (CAS NE) | — | W18 | — | 0.5 | G4XATOMX-A-A8 | — | — | — |
| 3S | Sensor ground (CAS) | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 3T | Intake air temperature (IAT) | — | W36 | — | 0.5 | G4XATOMX-A-A16 | — | — | — |
| 3U | Home position (CAS G) | — | W19 | — | 0.5 | G4XATOMX-A-A9 | — | — | — |
| 3V | Fuel temperature | — | — | — | — | — | — | — | — |
| 3W | Coolant temperature (ECT) | — | W30 | — | 0.5 | G4XATOMX-A-A15 | — | — | — |
OEM-D
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 4A | ECU main power (+12V via main relay/ECR) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 4AA | Brake pedal switch | — | W38 | — | 0.5 | G4XATOMX-A-A31 | — | — | — |
| 4AF | Ignition front trailing | — | W21 | — | 0.5 | G4XATOMX-A-A13 | — | — | — |
| 4AH | MAP sensor (PIM) | — | W28 | — | 0.5 | G4XATOMX-A-A17 | — | — | — |
| 4AJ | Ignition rear trailing | — | W22 | — | 0.5 | G4XATOMX-A-A12 | — | — | — |
| 4AN | Ignition leading (wasted spark) | — | W23 | — | 0.5 | G4XATOMX-A-A11 | — | — | — |
| 4B | Battery constant (+12V) | — | — | — | — | — | — | — | — |
| 4C | Start signal (STA) | — | — | — | — | — | — | — | — |
| 4D | Air pump clutch relay | — | W32 | — | 0.5 | G4XATOMX-A-A20 | — | — | — |
| 4E | ECU main power (+12V via main relay/ECR) | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 4F | Fuel pump speed relay | — | W33 | — | 0.5 | G4XATOMX-A-A19 | — | — | — |
| 4G | Fuel pump relay | — | W34 | — | 0.5 | G4XATOMX-A-A18 | — | — | — |
| 4I | A/C relay | — | — | — | — | — | — | — | — |
| 4K | Cooling fan relay (low speed) | — | — | — | — | — | — | — | — |
| 4L | Cooling fan relay (high speed) | — | — | — | — | — | — | — | — |
| 4M | Tachometer output | — | — | — | — | — | — | — | — |
| 4Q | Vehicle speed sensor | — | W37 | — | 0.5 | G4XATOMX-A-A30 | — | — | — |
| 4S | Clutch switch | — | — | — | — | — | — | — | — |
| 4V | A/C request | — | — | — | — | — | — | — | — |
| 4W | Power steering pressure switch | — | — | — | — | — | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W12 | — | 0.5 | OEM-A-1AB | — | — | — |
| 1 | — | — | W13 | — | 0.5 | OEM-A-1X | — | — | — |
| 1 | — | — | W14 | — | 0.5 | OEM-C-3AB | — | — | — |
| 1 | — | — | W15 | — | 0.5 | OEM-C-3S | — | — | — |
| 1 | — | — | W16 | — | 0.5 | G4XATOMX-A-A24 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-D-4A | — | — | — |
| 1 | — | — | W2 | — | 0.85 | OEM-D-4E | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W5 | — | 0.5 | MAIN-R-COIL- | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-A-1AF | — | — | — |
| 1 | — | — | W8 | — | 0.85 | OEM-A-1AJ | — | — | — |
| 1 | — | — | W9 | — | 0.85 | OEM-A-1L | — | — | — |
| 1 | — | — | W10 | — | 0.85 | G4XATOMX-A-A25 | — | — | — |
| 1 | — | — | W11 | — | 0.85 | G4XATOMX-A-A34 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-A-1AA | OMP stepper phase B1 | hbridge_out | — | — | — | single_source | |
| OEM-A-1AB | Sensor ground | sensor_ground | G4XATOMX-A-A24 | Sensor Ground | sensor_ground | single_source | |
| OEM-A-1AC | Injector 4 (rear secondary) | injector_out | G4XATOMX-A-A1 | Injector 4 | injector_out | single_source | |
| OEM-A-1AE | OMP stepper phase A1 | hbridge_out | — | — | — | single_source | |
| OEM-A-1AF | Power ground | ground | G4XATOMX-A-A25 + G4XATOMX-A-A34 + MAIN-R-COIL- | System Ground + System Ground + Relay coil negative (ECU low-side driver) | ground + load | single_source | |
| OEM-A-1AJ | Power ground | ground | G4XATOMX-A-A25 + G4XATOMX-A-A34 + MAIN-R-COIL- | System Ground + System Ground + Relay coil negative (ECU low-side driver) | ground + load | single_source | |
| OEM-A-1C | Idle speed control (ISC) solenoid | low_side_out | — | — | — | single_source | |
| OEM-A-1E | Turbo charge control solenoid | low_side_out | — | — | — | single_source | |
| OEM-A-1G | Purge solenoid | low_side_out | — | — | — | single_source | |
| OEM-A-1H | Cooling fan relay (low speed) | low_side_out | G4XATOMX-A-A21 | Aux 1 | low_side_out | single_source | |
| OEM-A-1I | Turbo charge relief solenoid | low_side_out | — | — | — | single_source | |
| OEM-A-1K | Turbo pre-control solenoid | low_side_out | — | — | — | single_source | |
| OEM-A-1L | Power ground | ground | G4XATOMX-A-A25 + G4XATOMX-A-A34 + MAIN-R-COIL- | System Ground + System Ground + Relay coil negative (ECU low-side driver) | ground + load | single_source | |
| OEM-A-1M | Turbo control solenoid | low_side_out | — | — | — | single_source | |
| OEM-A-1O | Boost control solenoid | low_side_out | — | — | — | single_source | |
| OEM-A-1Q | Injector 1 (front primary) | injector_out | G4XATOMX-A-A4 | Injector 1 | injector_out | single_source | |
| OEM-A-1S | OMP stepper phase B2 | hbridge_out | — | — | — | single_source | |
| OEM-A-1U | Injector 2 (rear primary) | injector_out | G4XATOMX-A-A3 | Injector 2 | injector_out | single_source | |
| OEM-A-1W | OMP stepper phase A2 | hbridge_out | — | — | — | single_source | |
| OEM-A-1X | Sensor ground | sensor_ground | G4XATOMX-A-A24 | Sensor Ground | sensor_ground | single_source | |
| OEM-A-1Y | Injector 3 (front secondary) | injector_out | G4XATOMX-A-A2 | Injector 3 | injector_out | single_source | |
| OEM-C-3A | +5V sensor supply | vref | G4XATOMX-A-A32 | +5V Out | vref | single_source | |
| OEM-C-3AB | Sensor ground | sensor_ground | G4XATOMX-A-A24 | Sensor Ground | sensor_ground | single_source | |
| OEM-C-3D | O2 sensor (narrowband) | lambda_nb_in | G4XATOMX-A-A33 | Analog Volt 3 | analog_in | single_source | |
| OEM-C-3G | Fuel pressure regulator control (PRC) solenoid | low_side_out | — | — | — | single_source | |
| OEM-C-3H | OMP position sensor | analog_in | — | — | — | single_source | |
| OEM-C-3I | Throttle position (TPS, full range) | analog_in | G4XATOMX-A-A22 | Analog Volt 2 | analog_in | single_source | |
| OEM-C-3O | Knock sensor | knock_in | G4XATOMX-A-A6 | Knock 1 | knock_in | single_source | |
| OEM-C-3R | Crank position (CAS NE) | trigger_in | G4XATOMX-A-A8 | Trigger 1 | trigger_in | single_source | |
| OEM-C-3S | Sensor ground (CAS) | sensor_ground | G4XATOMX-A-A24 | Sensor Ground | sensor_ground | single_source | |
| OEM-C-3T | Intake air temperature (IAT) | temp_in | G4XATOMX-A-A16 | Analog Temp 2 | temp_in | single_source | |
| OEM-C-3U | Home position (CAS G) | trigger_in | G4XATOMX-A-A9 | Trigger 2 | trigger_in | single_source | |
| OEM-C-3V | Fuel temperature | temp_in | — | — | — | single_source | |
| OEM-C-3W | Coolant temperature (ECT) | temp_in | G4XATOMX-A-A15 | Analog Temp 1 | temp_in | single_source | |
| OEM-D-4A | ECU main power (+12V via main relay/ECR) | power_in | — | — | — | single_source | |
| OEM-D-4AA | Brake pedal switch | digital_in | G4XATOMX-A-A31 | Digital Input 2 | digital_in | single_source | |
| OEM-D-4AF | Ignition front trailing | ignition_out | G4XATOMX-A-A13 | Ignition 1 | ignition_out | single_source | |
| OEM-D-4AH | MAP sensor (PIM) | analog_in | G4XATOMX-A-A17 | Analog Volt 1 | analog_in | single_source | |
| OEM-D-4AJ | Ignition rear trailing | ignition_out | G4XATOMX-A-A12 | Ignition 2 | ignition_out | single_source | |
| OEM-D-4AN | Ignition leading (wasted spark) | ignition_out | G4XATOMX-A-A11 | Ignition 3 | ignition_out | single_source | |
| OEM-D-4B | Battery constant (+12V) | power_in | — | — | — | single_source | |
| OEM-D-4C | Start signal (STA) | digital_in | — | — | — | single_source | |
| OEM-D-4D | Air pump clutch relay | low_side_out | G4XATOMX-A-A20 | Aux 2 | low_side_out | single_source | |
| OEM-D-4E | ECU main power (+12V via main relay/ECR) | power_in | — | — | — | single_source | |
| OEM-D-4F | Fuel pump speed relay | low_side_out | G4XATOMX-A-A19 | Aux 3 | low_side_out | single_source | |
| OEM-D-4G | Fuel pump relay | low_side_out | G4XATOMX-A-A18 | Aux 4 | low_side_out | single_source | |
| OEM-D-4I | A/C relay | low_side_out | — | — | — | single_source | |
| OEM-D-4K | Cooling fan relay (low speed) | low_side_out | — | — | — | single_source | |
| OEM-D-4L | Cooling fan relay (high speed) | low_side_out | — | — | — | single_source | |
| OEM-D-4M | Tachometer output | tacho_out | — | — | — | single_source | |
| OEM-D-4Q | Vehicle speed sensor | digital_in | G4XATOMX-A-A30 | Digital Input 1 | digital_in | single_source | |
| OEM-D-4S | Clutch switch | digital_in | — | — | — | single_source | |
| OEM-D-4V | A/C request | digital_in | — | — | — | single_source | |
| OEM-D-4W | Power steering pressure switch | digital_in | — | — | — | single_source |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-D-4A | SP-14V-1 | 0.85 | no route | ECU main power (+12V via main relay/ECR) | — | |
| W2 | OEM-D-4E | SP-14V-1 | 0.85 | no route | ECU main power (+12V via main relay/ECR) | — | |
| W3 | NEW-KEYON-1 | MAIN-R-COIL+ | 0.5 | no route | Relay coil positive (ignition-switched +12V) | — | |
| W4 | NEW-BATT-1 | MAIN-R-IN | 0.85 | no route | Relay contact input (battery + via main fuse) | — | |
| W5 | MAIN-R-COIL- | SP-GND-1 | 0.5 | no route | Relay coil negative (ECU low-side driver) | — | |
| W6 | MAIN-R-OUT | G4XATOMX-A-A5 | 0.85 | no route | Relay contact output (switched +12V bus) | — | |
| W7 | OEM-A-1AF | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W8 | OEM-A-1AJ | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W9 | OEM-A-1L | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W10 | SP-GND-1 | G4XATOMX-A-A25 | 0.85 | no route | System Ground | — | |
| W11 | SP-GND-1 | G4XATOMX-A-A34 | 0.85 | no route | System Ground | — | |
| W12 | OEM-A-1AB | SP-0V-1 | 0.5 | no route | Sensor ground | — | |
| W13 | OEM-A-1X | SP-0V-1 | 0.5 | no route | Sensor ground | — | |
| W14 | OEM-C-3AB | SP-0V-1 | 0.5 | no route | Sensor ground | — | |
| W15 | OEM-C-3S | SP-0V-1 | 0.5 | no route | Sensor ground (CAS) | — | |
| W16 | SP-0V-1 | G4XATOMX-A-A24 | 0.5 | no route | Sensor Ground | — | |
| W17 | OEM-C-3A | G4XATOMX-A-A32 | 0.5 | no route | +5V sensor supply | — | |
| W18 | OEM-C-3R | G4XATOMX-A-A8 | 0.5 | no route | Crank position (CAS NE) | — | |
| W19 | OEM-C-3U | G4XATOMX-A-A9 | 0.5 | no route | Home position (CAS G) | — | |
| W20 | OEM-C-3O | G4XATOMX-A-A6 | 0.5 | no route | Knock sensor | — | |
| W21 | OEM-D-4AF | G4XATOMX-A-A13 | 0.5 | no route | Ignition front trailing | — | |
| W22 | OEM-D-4AJ | G4XATOMX-A-A12 | 0.5 | no route | Ignition rear trailing | — | |
| W23 | OEM-D-4AN | G4XATOMX-A-A11 | 0.5 | no route | Ignition leading (wasted spark) | — | |
| W24 | OEM-A-1Q | G4XATOMX-A-A4 | 0.5 | no route | Injector 1 (front primary) | — | |
| W25 | OEM-A-1U | G4XATOMX-A-A3 | 0.5 | no route | Injector 2 (rear primary) | — | |
| W26 | OEM-A-1Y | G4XATOMX-A-A2 | 0.5 | no route | Injector 3 (front secondary) | — | |
| W27 | OEM-A-1AC | G4XATOMX-A-A1 | 0.5 | no route | Injector 4 (rear secondary) | — | |
| W28 | OEM-D-4AH | G4XATOMX-A-A17 | 0.5 | no route | MAP sensor (PIM) | — | |
| W29 | OEM-C-3I | G4XATOMX-A-A22 | 0.5 | no route | Throttle position (TPS, full range) | — | |
| W30 | OEM-C-3W | G4XATOMX-A-A15 | 0.5 | no route | Coolant temperature (ECT) | — | |
| W31 | OEM-A-1H | G4XATOMX-A-A21 | 0.5 | no route | Cooling fan relay (low speed) | — | |
| W32 | OEM-D-4D | G4XATOMX-A-A20 | 0.5 | no route | Air pump clutch relay | — | |
| W33 | OEM-D-4F | G4XATOMX-A-A19 | 0.5 | no route | Fuel pump speed relay | — | |
| W34 | OEM-D-4G | G4XATOMX-A-A18 | 0.5 | no route | Fuel pump relay | — | |
| W35 | OEM-C-3D | G4XATOMX-A-A33 | 0.5 | no route | O2 sensor (narrowband) | — | |
| W36 | OEM-C-3T | G4XATOMX-A-A16 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W37 | OEM-D-4Q | G4XATOMX-A-A30 | 0.5 | no route | Vehicle speed sensor | — | |
| W38 | OEM-D-4AA | G4XATOMX-A-A31 | 0.5 | no route | Brake pedal 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 (5)
| Severity | Code | Subject | Message |
|---|---|---|---|
| warn | LOAD_UNKNOWN | G4XATOMX-A-A18 | G4XATOMX-A-A18 "Aux 4" drives OEM-D-4G Fuel pump relay (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | G4XATOMX-A-A19 | G4XATOMX-A-A19 "Aux 3" drives OEM-D-4F Fuel pump speed relay (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | G4XATOMX-A-A20 | G4XATOMX-A-A20 "Aux 2" drives OEM-D-4D Air pump clutch relay (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | G4XATOMX-A-A21 | G4XATOMX-A-A21 "Aux 1" drives OEM-A-1H Cooling fan relay (low speed) (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| info | UNMAPPED | OEM | 22 optional OEM pins are not mapped: OEM-A-1AA OMP stepper phase B1; OEM-A-1AE OMP stepper phase A1; OEM-A-1C Idle speed control (ISC) solenoid; OEM-A-1E Turbo charge control solenoid; OEM-A-1G Purge solenoid; OEM-A-1I Turbo charge relief solenoid; OEM-A-1K Turbo pre-control solenoid; OEM-A-1M Turbo control solenoid; OEM-A-1O Boost control solenoid; OEM-A-1S OMP stepper phase B2; OEM-A-1W OMP stepper phase A2; OEM-C-3G Fuel pressure regulator control (PRC) solenoid; OEM-C-3H OMP position sensor; OEM-C-3V Fuel temperature; OEM-D-4C Start signal (STA); OEM-D-4I A/C relay; OEM-D-4K Cooling fan relay (low speed); OEM-D-4L Cooling fan relay (high speed); OEM-D-4M Tachometer output; OEM-D-4S Clutch switch; OEM-D-4V A/C request; OEM-D-4W Power steering pressure switch |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-D-4B | Battery-constant (memory) feed of the stock ECU: the new ECU has no such input, so it is not needed. | mapping-proposal |
Notes
Fit check: needs add-on. Resolve these before building: - Oil metering pump stepper driver needed; not documented for this ECU - Sequential twin-turbo control unconfirmed for this ECU Auto-mapped by auto_map() from the library pin data on 2026-10-20. Review every wire against both manuals before building. Not wired: - OEM-D 4B: Battery constant (+12V): Link G4X AtomX has no battery-constant memory input; not needed - OEM-D 4I: A/C relay: no free relay_control/low_side/heater_low_side/ls_hs/injector rated ≥ 0.2 A on Link G4X AtomX - OEM-D 4K: Cooling fan relay (low speed): no free relay_control/low_side/heater_low_side/ls_hs/injector rated ≥ 0.2 A on Link G4X AtomX - OEM-D 4L: Cooling fan relay (high speed): no free relay_control/low_side/heater_low_side/ls_hs/injector rated ≥ 0.2 A on Link G4X AtomX - OEM-A 1C: Idle speed control (ISC) solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on Link G4X AtomX - OEM-A 1E: Turbo charge control solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on Link G4X AtomX - OEM-A 1G: Purge solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on Link G4X AtomX - OEM-A 1I: Turbo charge relief solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on Link G4X AtomX - OEM-A 1K: Turbo pre-control solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on Link G4X AtomX - OEM-A 1M: Turbo control solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on Link G4X AtomX - OEM-A 1O: Boost control solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on Link G4X AtomX - OEM-C 3G: Fuel pressure regulator control (PRC) solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on Link G4X AtomX - OEM-D 4M: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on Link G4X AtomX - OEM-C 3V: Fuel temperature: no free thermistor/analog_0_5 on Link G4X AtomX - OEM-C 3H: OMP position sensor: no free analog_0_5 on Link G4X AtomX - OEM-D 4C: Start signal (STA): no free switch_in/frequency_in/analog_0_5 on Link G4X AtomX - OEM-D 4S: Clutch switch: no free switch_in/frequency_in/analog_0_5 on Link G4X AtomX - OEM-D 4V: A/C request: no free switch_in/frequency_in/analog_0_5 on Link G4X AtomX - OEM-D 4W: Power steering pressure switch: no free switch_in/frequency_in/analog_0_5 on Link G4X AtomX - OEM-A 1AA: OMP stepper phase B1: no +/− pair in the pinout (multi-phase or half-documented motor); wire by hand - OEM-A 1AE: OMP stepper phase A1: no +/− pair in the pinout (multi-phase or half-documented motor); wire by hand - OEM-A 1S: OMP stepper phase B2: no +/− pair in the pinout (multi-phase or half-documented motor); wire by hand - OEM-A 1W: OMP stepper phase A2: no +/− pair in the pinout (multi-phase or half-documented motor); wire by hand
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | Emtron SL4/SL6/SL8 pinout pages | https://docs.emtronaustralia.com.au/engine-management/wiring/index.html | archive | 2026-10-05 | e52b3da9996a |
| 4 | vendor_doc | Haltech: RX7 FD Series 7-8 Nexus PnP adapter pinout (HT-186338) | https://www.haltech.com/wp-admin/admin-ajax.php?action=ht_get_file&id=681af8c0cc78f3b6860e615e&op=1 | — | — | — |
| 4 | vendor_doc | Link: G4X AtomX quickstart | https://linkecu.com/documentation/AtomXQuickstartGuide.pdf | archive | 2026-10-05 | 5fa903ea7bdf |
| 3 | community_copy | YourSpec: Link G4X AtomX ECU flying-lead harness wiring list | https://wpm.yourspec.com/projects/view/1462 | — | — | — |
| 3 | forum | rusEFI Mazda Miata 2002 engine wiring | https://github.com/rusefi/rusefi/wiki/Mazda-Miata-2002 | archive | 2026-10-05 | cc3cae670408 |
| 2 | forum | defreezemotorsport: MS3 FD3S 16-bit ECU pinout | https://defreezemotorsport.ru/doku.php?id=ms3:fd3s162 | — | — | — |