Mazda RX-7 FD 1992-2002 (13B-REW twin-turbo) → MaxxECU MaxxECU MINI REV10+ (auto)
Mazda RX-7 FD 1992-2002 (13B-REW twin-turbo) — MaxxECU — MaxxECU MINI
⚠ 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 | 1: read the Findings page before cutting any wire |
| 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-D-4A | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | OEM-D-4E | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-14V-1 | MAXXECUMINI-C1-H4 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-A-1AF | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-A-1AJ | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-A-1L | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | SP-GND-1 | MAXXECUMINI-C1-G4 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | OEM-A-1AB | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-A-1X | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-C-3AB | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-C-3S | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | SP-0V-1 | MAXXECUMINI-C1-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | SP-0V-1 | MAXXECUMINI-C1-B3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | SP-0V-1 | MAXXECUMINI-C1-B4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | SP-0V-1 | MAXXECUMINI-C1-D4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-C-3A | MAXXECUMINI-C1-E2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-C-3R | MAXXECUMINI-C1-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-D-4AF | MAXXECUMINI-C1-F1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-D-4AJ | MAXXECUMINI-C1-F2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-D-4AN | MAXXECUMINI-C1-F3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-A-1Q | MAXXECUMINI-C1-G3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-A-1U | MAXXECUMINI-C1-H1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-A-1Y | MAXXECUMINI-C1-H2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-A-1AC | MAXXECUMINI-C1-H3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-A-1H | MAXXECUMINI-C1-G2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-D-4D | MAXXECUMINI-C1-G1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-D-4F | MAXXECUMINI-C1-E1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-D-4G | MAXXECUMINI-C1-D1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-D-4AH | MAXXECUMINI-C1-C3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-C-3I | MAXXECUMINI-C1-D2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-C-3D | MAXXECUMINI-C1-C4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-C-3W | MAXXECUMINI-C1-C1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-C-3T | MAXXECUMINI-C1-C2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-D-4Q | MAXXECUMINI-C1-B1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-D-4AA | MAXXECUMINI-C1-B2 | 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 | MAXXECUMINI-C1-A2 | MAXXECUMINI-C1-E2 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 2 | MAXXECUMINI-C1-A2 | MAXXECUMINI-C1-H4 | open (OL) | sensor ground must not touch +12 V supply | |
| 3 | MAXXECUMINI-C1-E2 | MAXXECUMINI-C1-H4 | open (OL) | 5 V sensor reference must not touch +12 V supply | |
| 4 | MAXXECUMINI-C1-G4 | MAXXECUMINI-C1-E2 | open (OL) | power ground must not touch 5 V sensor reference | |
| 5 | MAXXECUMINI-C1-G4 | MAXXECUMINI-C1-H4 | open (OL) | power ground 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
MAXXECUMINI-C1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A1 | TRIGGER | — | W17 | — | 0.5 | OEM-C-3R | — | — | — |
| A2 | TRIGGER GND | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| B1 | DIN 1 (Hall only) | — | W34 | — | 0.5 | OEM-D-4Q | — | — | — |
| B2 | DIN 2 (Hall only) | — | W35 | — | 0.5 | OEM-D-4AA | — | — | — |
| B3 | SENSOR GND | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| B4 | SENSOR GND | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| C1 | CLT | — | W32 | — | 0.5 | OEM-C-3W | — | — | — |
| C2 | IAT | — | W33 | — | 0.5 | OEM-C-3T | — | — | — |
| C3 | AIN 3 (0-5V) | — | W29 | — | 0.5 | OEM-D-4AH | — | — | — |
| C4 | AIN 4 (0-5V) | — | W31 | — | 0.5 | OEM-C-3D | — | — | — |
| D1 | GPO 8/TACHO | — | W28 | — | 0.5 | OEM-D-4G | — | — | — |
| D2 | TPS | — | W30 | — | 0.5 | OEM-C-3I | — | — | — |
| D3 | GND Shield | — | — | — | — | — | — | — | — |
| D4 | SENSOR GND | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| E1 | GPO 3 | — | W27 | — | 0.5 | OEM-D-4F | — | — | — |
| E2 | +5V sensor supply | — | W16 | — | 0.5 | OEM-C-3A | — | — | — |
| E3 | CAN L | — | — | — | — | — | — | — | — |
| E4 | CAN H | — | — | — | — | — | — | — | — |
| F1 | IGN 1 | — | W18 | — | 0.5 | OEM-D-4AF | — | — | — |
| F2 | IGN 2 | — | W19 | — | 0.5 | OEM-D-4AJ | — | — | — |
| F3 | IGN 3 | — | W20 | — | 0.5 | OEM-D-4AN | — | — | — |
| F4 | IGN 4 | — | — | — | — | — | — | — | — |
| G1 | GPO 2 | — | W26 | — | 0.5 | OEM-D-4D | — | — | — |
| G2 | GPO 1 | — | W25 | — | 0.5 | OEM-A-1H | — | — | — |
| G3 | INJ 1 | — | W21 | — | 0.5 | OEM-A-1Q | — | — | — |
| G4 | ENGINE GND | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| H1 | INJ 2 | — | W22 | — | 0.5 | OEM-A-1U | — | — | — |
| H2 | INJ 3 | — | W23 | — | 0.5 | OEM-A-1Y | — | — | — |
| H3 | INJ 4 | — | W24 | — | 0.5 | OEM-A-1AC | — | — | — |
| H4 | +12V (ECU power supply) | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
OEM-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1AA | OMP stepper phase B1 | — | — | — | — | — | — | — | — |
| 1AB | Sensor ground | — | W8 | — | 0.5 | SP-0V-1 | — | — | — |
| 1AC | Injector 4 (rear secondary) | — | W24 | — | 0.5 | MAXXECUMINI-C1-H3 | — | — | — |
| 1AE | OMP stepper phase A1 | — | — | — | — | — | — | — | — |
| 1AF | Power ground | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| 1AJ | Power ground | — | W5 | — | 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) | — | W25 | — | 0.5 | MAXXECUMINI-C1-G2 | — | — | — |
| 1I | Turbo charge relief solenoid | — | — | — | — | — | — | — | — |
| 1K | Turbo pre-control solenoid | — | — | — | — | — | — | — | — |
| 1L | Power ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 1M | Turbo control solenoid | — | — | — | — | — | — | — | — |
| 1O | Boost control solenoid | — | — | — | — | — | — | — | — |
| 1Q | Injector 1 (front primary) | — | W21 | — | 0.5 | MAXXECUMINI-C1-G3 | — | — | — |
| 1S | OMP stepper phase B2 | — | — | — | — | — | — | — | — |
| 1U | Injector 2 (rear primary) | — | W22 | — | 0.5 | MAXXECUMINI-C1-H1 | — | — | — |
| 1W | OMP stepper phase A2 | — | — | — | — | — | — | — | — |
| 1X | Sensor ground | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| 1Y | Injector 3 (front secondary) | — | W23 | — | 0.5 | MAXXECUMINI-C1-H2 | — | — | — |
OEM-C
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 3A | +5V sensor supply | — | W16 | — | 0.5 | MAXXECUMINI-C1-E2 | — | — | — |
| 3AB | Sensor ground | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| 3D | O2 sensor (narrowband) | — | W31 | — | 0.5 | MAXXECUMINI-C1-C4 | — | — | — |
| 3G | Fuel pressure regulator control (PRC) solenoid | — | — | — | — | — | — | — | — |
| 3H | OMP position sensor | — | — | — | — | — | — | — | — |
| 3I | Throttle position (TPS, full range) | — | W30 | — | 0.5 | MAXXECUMINI-C1-D2 | — | — | — |
| 3O | Knock sensor | — | — | — | — | — | — | — | — |
| 3R | Crank position (CAS NE) | — | W17 | — | 0.5 | MAXXECUMINI-C1-A1 | — | — | — |
| 3S | Sensor ground (CAS) | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| 3T | Intake air temperature (IAT) | — | W33 | — | 0.5 | MAXXECUMINI-C1-C2 | — | — | — |
| 3U | Home position (CAS G) | — | — | — | — | — | — | — | — |
| 3V | Fuel temperature | — | — | — | — | — | — | — | — |
| 3W | Coolant temperature (ECT) | — | W32 | — | 0.5 | MAXXECUMINI-C1-C1 | — | — | — |
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 | — | W35 | — | 0.5 | MAXXECUMINI-C1-B2 | — | — | — |
| 4AF | Ignition front trailing | — | W18 | — | 0.5 | MAXXECUMINI-C1-F1 | — | — | — |
| 4AH | MAP sensor (PIM) | — | W29 | — | 0.5 | MAXXECUMINI-C1-C3 | — | — | — |
| 4AJ | Ignition rear trailing | — | W19 | — | 0.5 | MAXXECUMINI-C1-F2 | — | — | — |
| 4AN | Ignition leading (wasted spark) | — | W20 | — | 0.5 | MAXXECUMINI-C1-F3 | — | — | — |
| 4B | Battery constant (+12V) | — | — | — | — | — | — | — | — |
| 4C | Ignition switch / start signal | — | — | — | — | — | — | — | — |
| 4D | Air pump clutch relay | — | W26 | — | 0.5 | MAXXECUMINI-C1-G1 | — | — | — |
| 4E | ECU main power (+12V via main relay/ECR) | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 4F | Fuel pump speed relay | — | W27 | — | 0.5 | MAXXECUMINI-C1-E1 | — | — | — |
| 4G | Fuel pump relay | — | W28 | — | 0.5 | MAXXECUMINI-C1-D1 | — | — | — |
| 4I | A/C relay | — | — | — | — | — | — | — | — |
| 4K | Cooling fan relay (low speed) | — | — | — | — | — | — | — | — |
| 4L | Cooling fan relay (high speed) | — | — | — | — | — | — | — | — |
| 4M | Tachometer output | — | — | — | — | — | — | — | — |
| 4Q | Vehicle speed sensor | — | W34 | — | 0.5 | MAXXECUMINI-C1-B1 | — | — | — |
| 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 | — | — | W8 | — | 0.5 | OEM-A-1AB | — | — | — |
| 1 | — | — | W9 | — | 0.5 | OEM-A-1X | — | — | — |
| 1 | — | — | W10 | — | 0.5 | OEM-C-3AB | — | — | — |
| 1 | — | — | W11 | — | 0.5 | OEM-C-3S | — | — | — |
| 1 | — | — | W12 | — | 0.5 | MAXXECUMINI-C1-A2 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | MAXXECUMINI-C1-B3 | — | — | — |
| 1 | — | — | W14 | — | 0.5 | MAXXECUMINI-C1-B4 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | MAXXECUMINI-C1-D4 | — | — | — |
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 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | MAXXECUMINI-C1-H4 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W4 | — | 0.85 | OEM-A-1AF | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-A-1AJ | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-A-1L | — | — | — |
| 1 | — | — | W7 | — | 0.85 | MAXXECUMINI-C1-G4 | — | — | — |
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 | MAXXECUMINI-C1-A2 + MAXXECUMINI-C1-B3 + MAXXECUMINI-C1-B4 + MAXXECUMINI-C1-D4 | TRIGGER GND + SENSOR GND + SENSOR GND + SENSOR GND | sensor_ground | single_source | |
| OEM-A-1AC | Injector 4 (rear secondary) | injector_out | MAXXECUMINI-C1-H3 | INJ 4 | injector_out | single_source | |
| OEM-A-1AE | OMP stepper phase A1 | hbridge_out | — | — | — | single_source | |
| OEM-A-1AF | Power ground | ground | MAXXECUMINI-C1-G4 | ENGINE GND | ground | single_source | |
| OEM-A-1AJ | Power ground | ground | MAXXECUMINI-C1-G4 | ENGINE GND | ground | 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 | MAXXECUMINI-C1-G2 | GPO 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 | MAXXECUMINI-C1-G4 | ENGINE GND | ground | 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 | MAXXECUMINI-C1-G3 | INJ 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 | MAXXECUMINI-C1-H1 | INJ 2 | injector_out | single_source | |
| OEM-A-1W | OMP stepper phase A2 | hbridge_out | — | — | — | single_source | |
| OEM-A-1X | Sensor ground | sensor_ground | MAXXECUMINI-C1-A2 + MAXXECUMINI-C1-B3 + MAXXECUMINI-C1-B4 + MAXXECUMINI-C1-D4 | TRIGGER GND + SENSOR GND + SENSOR GND + SENSOR GND | sensor_ground | single_source | |
| OEM-A-1Y | Injector 3 (front secondary) | injector_out | MAXXECUMINI-C1-H2 | INJ 3 | injector_out | single_source | |
| OEM-C-3A | +5V sensor supply | vref | MAXXECUMINI-C1-E2 | +5V sensor supply | vref | single_source | |
| OEM-C-3AB | Sensor ground | sensor_ground | MAXXECUMINI-C1-A2 + MAXXECUMINI-C1-B3 + MAXXECUMINI-C1-B4 + MAXXECUMINI-C1-D4 | TRIGGER GND + SENSOR GND + SENSOR GND + SENSOR GND | sensor_ground | single_source | |
| OEM-C-3D | O2 sensor (narrowband) | lambda_nb_in | MAXXECUMINI-C1-C4 | AIN 4 (0-5V) | 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 | MAXXECUMINI-C1-D2 | TPS | analog_in | single_source | |
| OEM-C-3O | Knock sensor | knock_in | — | — | — | single_source | |
| OEM-C-3R | Crank position (CAS NE) | trigger_in | MAXXECUMINI-C1-A1 | TRIGGER | trigger_in | single_source | |
| OEM-C-3S | Sensor ground (CAS) | sensor_ground | MAXXECUMINI-C1-A2 + MAXXECUMINI-C1-B3 + MAXXECUMINI-C1-B4 + MAXXECUMINI-C1-D4 | TRIGGER GND + SENSOR GND + SENSOR GND + SENSOR GND | sensor_ground | single_source | |
| OEM-C-3T | Intake air temperature (IAT) | temp_in | MAXXECUMINI-C1-C2 | IAT | temp_in | single_source | |
| OEM-C-3U | Home position (CAS G) | trigger_in | — | — | — | single_source | |
| OEM-C-3V | Fuel temperature | temp_in | — | — | — | single_source | |
| OEM-C-3W | Coolant temperature (ECT) | temp_in | MAXXECUMINI-C1-C1 | CLT | temp_in | single_source | |
| OEM-D-4A | ECU main power (+12V via main relay/ECR) | power_in | MAXXECUMINI-C1-H4 | +12V (ECU power supply) | power_in | single_source | |
| OEM-D-4AA | Brake pedal switch | digital_in | MAXXECUMINI-C1-B2 | DIN 2 (Hall only) | digital_in | single_source | |
| OEM-D-4AF | Ignition front trailing | ignition_out | MAXXECUMINI-C1-F1 | IGN 1 | ignition_out | single_source | |
| OEM-D-4AH | MAP sensor (PIM) | analog_in | MAXXECUMINI-C1-C3 | AIN 3 (0-5V) | analog_in | single_source | |
| OEM-D-4AJ | Ignition rear trailing | ignition_out | MAXXECUMINI-C1-F2 | IGN 2 | ignition_out | single_source | |
| OEM-D-4AN | Ignition leading (wasted spark) | ignition_out | MAXXECUMINI-C1-F3 | IGN 3 | ignition_out | single_source | |
| OEM-D-4B | Battery constant (+12V) | power_in | — | — | — | single_source | |
| OEM-D-4C | Ignition switch / start signal | digital_in | — | — | — | single_source | |
| OEM-D-4D | Air pump clutch relay | low_side_out | MAXXECUMINI-C1-G1 | GPO 2 | low_side_out | single_source | |
| OEM-D-4E | ECU main power (+12V via main relay/ECR) | power_in | MAXXECUMINI-C1-H4 | +12V (ECU power supply) | power_in | single_source | |
| OEM-D-4F | Fuel pump speed relay | low_side_out | MAXXECUMINI-C1-E1 | GPO 3 | low_side_out | single_source | |
| OEM-D-4G | Fuel pump relay | low_side_out | MAXXECUMINI-C1-D1 | GPO 8/TACHO | 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 | MAXXECUMINI-C1-B1 | DIN 1 (Hall only) | 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 | SP-14V-1 | MAXXECUMINI-C1-H4 | 0.85 | no route | +12V (ECU power supply) | — | |
| W4 | OEM-A-1AF | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W5 | OEM-A-1AJ | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W6 | OEM-A-1L | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W7 | SP-GND-1 | MAXXECUMINI-C1-G4 | 0.85 | no route | ENGINE GND | — | |
| W8 | OEM-A-1AB | SP-0V-1 | 0.5 | no route | Sensor ground | — | |
| W9 | OEM-A-1X | SP-0V-1 | 0.5 | no route | Sensor ground | — | |
| W10 | OEM-C-3AB | SP-0V-1 | 0.5 | no route | Sensor ground | — | |
| W11 | OEM-C-3S | SP-0V-1 | 0.5 | no route | Sensor ground (CAS) | — | |
| W12 | SP-0V-1 | MAXXECUMINI-C1-A2 | 0.5 | no route | TRIGGER GND | — | |
| W13 | SP-0V-1 | MAXXECUMINI-C1-B3 | 0.5 | no route | SENSOR GND | — | |
| W14 | SP-0V-1 | MAXXECUMINI-C1-B4 | 0.5 | no route | SENSOR GND | — | |
| W15 | SP-0V-1 | MAXXECUMINI-C1-D4 | 0.5 | no route | SENSOR GND | — | |
| W16 | OEM-C-3A | MAXXECUMINI-C1-E2 | 0.5 | no route | +5V sensor supply | — | |
| W17 | OEM-C-3R | MAXXECUMINI-C1-A1 | 0.5 | no route | Crank position (CAS NE) | — | |
| W18 | OEM-D-4AF | MAXXECUMINI-C1-F1 | 0.5 | no route | Ignition front trailing | — | |
| W19 | OEM-D-4AJ | MAXXECUMINI-C1-F2 | 0.5 | no route | Ignition rear trailing | — | |
| W20 | OEM-D-4AN | MAXXECUMINI-C1-F3 | 0.5 | no route | Ignition leading (wasted spark) | — | |
| W21 | OEM-A-1Q | MAXXECUMINI-C1-G3 | 0.5 | no route | Injector 1 (front primary) | — | |
| W22 | OEM-A-1U | MAXXECUMINI-C1-H1 | 0.5 | no route | Injector 2 (rear primary) | — | |
| W23 | OEM-A-1Y | MAXXECUMINI-C1-H2 | 0.5 | no route | Injector 3 (front secondary) | — | |
| W24 | OEM-A-1AC | MAXXECUMINI-C1-H3 | 0.5 | no route | Injector 4 (rear secondary) | — | |
| W25 | OEM-A-1H | MAXXECUMINI-C1-G2 | 0.5 | no route | Cooling fan relay (low speed) | — | |
| W26 | OEM-D-4D | MAXXECUMINI-C1-G1 | 0.5 | no route | Air pump clutch relay | — | |
| W27 | OEM-D-4F | MAXXECUMINI-C1-E1 | 0.5 | no route | Fuel pump speed relay | — | |
| W28 | OEM-D-4G | MAXXECUMINI-C1-D1 | 0.5 | no route | Fuel pump relay | — | |
| W29 | OEM-D-4AH | MAXXECUMINI-C1-C3 | 0.5 | no route | MAP sensor (PIM) | — | |
| W30 | OEM-C-3I | MAXXECUMINI-C1-D2 | 0.5 | no route | Throttle position (TPS, full range) | — | |
| W31 | OEM-C-3D | MAXXECUMINI-C1-C4 | 0.5 | no route | O2 sensor (narrowband) | — | |
| W32 | OEM-C-3W | MAXXECUMINI-C1-C1 | 0.5 | no route | Coolant temperature (ECT) | — | |
| W33 | OEM-C-3T | MAXXECUMINI-C1-C2 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W34 | OEM-D-4Q | MAXXECUMINI-C1-B1 | 0.5 | no route | Vehicle speed sensor | — | |
| W35 | OEM-D-4AA | MAXXECUMINI-C1-B2 | 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 (6)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | REQUIRED_UNMAPPED | OEM-C-3U | Required OEM function "Home position (CAS G)" (trigger_in) is not connected to the new ECU. |
| warn | LOAD_UNKNOWN | MAXXECUMINI-C1-D1 | MAXXECUMINI-C1-D1 "GPO 8/TACHO" drives OEM-D-4G Fuel pump relay (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | MAXXECUMINI-C1-E1 | MAXXECUMINI-C1-E1 "GPO 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 | MAXXECUMINI-C1-G1 | MAXXECUMINI-C1-G1 "GPO 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 | MAXXECUMINI-C1-G2 | MAXXECUMINI-C1-G2 "GPO 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 | 23 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-3O Knock sensor; OEM-C-3V Fuel temperature; OEM-D-4C Ignition switch / start signal; 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 needed; not documented for this ECU - No knock input; the stock knock sensor would be unused - Trigger pattern needs a workaround: "Suzuki 13B sequential" in the trigger list — likely a mislabelled Mazda 13B rotary pattern. Auto-mapped by auto_map() from the library pin data on 2026-10-11. Review every wire against both manuals before building. Open items: - OEM-C 3U: Home position (CAS G): no free cam_vr/cam_hall/frequency_in input on MaxxECU MaxxECU MINI Not wired: - OEM-D 4B: Battery constant (+12V): MaxxECU MaxxECU MINI has no battery-constant input; not needed - OEM-C 3O: Knock sensor: no free knock input on MaxxECU MaxxECU MINI - OEM-D 4C: Ignition switch / start signal: key-on 12 V sense — optional in a swap (the main relay is energized from keyed 12 V, not from this pin); MaxxECU MaxxECU MINI has no dedicated key-on input - OEM-A 1AA: OMP stepper phase B1: no free hbridge on MaxxECU MaxxECU MINI - OEM-A 1AE: OMP stepper phase A1: no free hbridge on MaxxECU MaxxECU MINI - OEM-A 1S: OMP stepper phase B2: no free hbridge on MaxxECU MaxxECU MINI - OEM-A 1W: OMP stepper phase A2: no free hbridge on MaxxECU MaxxECU MINI - OEM-D 4I: A/C relay: no free relay_control/low_side/ls_hs/injector/hbridge rated ≥ 0.2 A on MaxxECU MaxxECU MINI - OEM-D 4K: Cooling fan relay (low speed): no free relay_control/low_side/ls_hs/injector/hbridge rated ≥ 0.2 A on MaxxECU MaxxECU MINI - OEM-D 4L: Cooling fan relay (high speed): no free relay_control/low_side/ls_hs/injector/hbridge rated ≥ 0.2 A on MaxxECU MaxxECU MINI - OEM-A 1C: Idle speed control (ISC) solenoid: no free low_side/ls_hs/injector/hbridge on MaxxECU MaxxECU MINI - OEM-A 1E: Turbo charge control solenoid: no free low_side/ls_hs/injector/hbridge on MaxxECU MaxxECU MINI - OEM-A 1G: Purge solenoid: no free low_side/ls_hs/injector/hbridge on MaxxECU MaxxECU MINI - OEM-A 1I: Turbo charge relief solenoid: no free low_side/ls_hs/injector/hbridge on MaxxECU MaxxECU MINI - OEM-A 1K: Turbo pre-control solenoid: no free low_side/ls_hs/injector/hbridge on MaxxECU MaxxECU MINI - OEM-A 1M: Turbo control solenoid: no free low_side/ls_hs/injector/hbridge on MaxxECU MaxxECU MINI - OEM-A 1O: Boost control solenoid: no free low_side/ls_hs/injector/hbridge on MaxxECU MaxxECU MINI - OEM-C 3G: Fuel pressure regulator control (PRC) solenoid: no free low_side/ls_hs/injector/hbridge on MaxxECU MaxxECU MINI - OEM-D 4M: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on MaxxECU MaxxECU MINI - OEM-C 3V: Fuel temperature: no free thermistor/analog_0_5 on MaxxECU MaxxECU MINI - OEM-C 3H: OMP position sensor: no free analog_0_5 on MaxxECU MaxxECU MINI - OEM-D 4S: Clutch switch: no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU MINI - OEM-D 4V: A/C request: no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU MINI - OEM-D 4W: Power steering pressure switch: no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU MINI
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 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 | MaxxECU GEN1 pinout (MINI / STREET / SPORT / V1 / RACE / PRO) | http://www.maxxecu.com/webhelp/wirings-maxxecu_pinout.html | archive | 2026-10-05 | 2e37b6814690 |
| 2 | forum | defreezemotorsport: MS3 FD3S 16-bit ECU pinout | https://defreezemotorsport.ru/doku.php?id=ms3:fd3s162 | — | — | — |