MX-5 Miata NA8 1994-97 (BP-ZE, 1.8) → MaxxECU MaxxECU MINI REV10+ (auto)
MX-5 Miata NA8 1994-97 (BP-ZE, 1.8) — MaxxECU — MaxxECU MINI
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 2026-10-08
Before you start
| 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 | 31 wires · 6 connectors · 2 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-1-B | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | SP-14V-1 | MAXXECUMINI-C1-H4 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | OEM-2-A | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-2-B | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-2-C | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-2-D | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | SP-GND-1 | MAXXECUMINI-C1-G4 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | OEM-2-F | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-0V-1 | MAXXECUMINI-C1-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-0V-1 | MAXXECUMINI-C1-B3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-0V-1 | MAXXECUMINI-C1-B4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | SP-0V-1 | MAXXECUMINI-C1-D4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-2-K | MAXXECUMINI-C1-E2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-2-E | MAXXECUMINI-C1-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-1-G | MAXXECUMINI-C1-F1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-1-H | MAXXECUMINI-C1-F2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-2-U | MAXXECUMINI-C1-G3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-2-V | MAXXECUMINI-C1-H1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-2-Y | MAXXECUMINI-C1-H2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-2-Z | MAXXECUMINI-C1-H3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-1-J | MAXXECUMINI-C1-G2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-1-R | MAXXECUMINI-C1-G1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-2-S | MAXXECUMINI-C1-E1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-2-T | MAXXECUMINI-C1-D1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-2-O | MAXXECUMINI-C1-C3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-2-M | MAXXECUMINI-C1-D2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-2-N | MAXXECUMINI-C1-C4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-2-Q | MAXXECUMINI-C1-C1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-2-P | MAXXECUMINI-C1-C2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-1-M | MAXXECUMINI-C1-B1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-1-C | 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-H4 | MAXXECUMINI-C1-A2 | open (OL) | +12 V supply must not touch sensor ground | |
| 2 | MAXXECUMINI-C1-H4 | MAXXECUMINI-C1-G4 | open (OL) | +12 V supply must not touch power ground | |
| 3 | MAXXECUMINI-C1-A2 | MAXXECUMINI-C1-E2 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 4 | MAXXECUMINI-C1-G4 | MAXXECUMINI-C1-E2 | open (OL) | power ground must not touch 5 V sensor reference | |
| 5 | MAXXECUMINI-C1-H4 | MAXXECUMINI-C1-E2 | open (OL) | +12 V supply must not touch 5 V sensor reference |
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 | — | W14 | — | 0.5 | OEM-2-E | — | — | — |
| A2 | TRIGGER GND | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| B1 | DIN 1 (Hall only) | — | W30 | — | 0.5 | OEM-1-M | — | — | — |
| B2 | DIN 2 (Hall only) | — | W31 | — | 0.5 | OEM-1-C | — | — | — |
| B3 | SENSOR GND | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| B4 | SENSOR GND | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| C1 | CLT | — | W28 | — | 0.5 | OEM-2-Q | — | — | — |
| C2 | IAT | — | W29 | — | 0.5 | OEM-2-P | — | — | — |
| C3 | AIN 3 (0-5V) | — | W25 | — | 0.5 | OEM-2-O | — | — | — |
| C4 | AIN 4 (0-5V) | — | W27 | — | 0.5 | OEM-2-N | — | — | — |
| D1 | GPO 8/TACHO | — | W24 | — | 0.5 | OEM-2-T | — | — | — |
| D2 | TPS | — | W26 | — | 0.5 | OEM-2-M | — | — | — |
| D3 | GND Shield | — | — | — | — | — | — | — | — |
| D4 | SENSOR GND | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| E1 | GPO 3 | — | W23 | — | 0.5 | OEM-2-S | — | — | — |
| E2 | +5V sensor supply | — | W13 | — | 0.5 | OEM-2-K | — | — | — |
| E3 | CAN L | — | — | — | — | — | — | — | — |
| E4 | CAN H | — | — | — | — | — | — | — | — |
| F1 | IGN 1 | — | W15 | — | 0.5 | OEM-1-G | — | — | — |
| F2 | IGN 2 | — | W16 | — | 0.5 | OEM-1-H | — | — | — |
| F3 | IGN 3 | — | — | — | — | — | — | — | — |
| F4 | IGN 4 | — | — | — | — | — | — | — | — |
| G1 | GPO 2 | — | W22 | — | 0.5 | OEM-1-R | — | — | — |
| G2 | GPO 1 | — | W21 | — | 0.5 | OEM-1-J | — | — | — |
| G3 | INJ 1 | — | W17 | — | 0.5 | OEM-2-U | — | — | — |
| G4 | ENGINE GND | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| H1 | INJ 2 | — | W18 | — | 0.5 | OEM-2-V | — | — | — |
| H2 | INJ 3 | — | W19 | — | 0.5 | OEM-2-Y | — | — | — |
| H3 | INJ 4 | — | W20 | — | 0.5 | OEM-2-Z | — | — | — |
| H4 | +12V (ECU power supply) | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
OEM-1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Constant +12V | — | — | — | — | — | — | — | — |
| B | ECU power +14V (main relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| C | Start signal | — | W31 | — | 0.5 | MAXXECUMINI-C1-B2 | — | — | — |
| E | Malfunction indicator lamp (MIL) | — | — | — | — | — | — | — | — |
| G | Ignition 1 (coils 1+4, wasted spark) | — | W15 | — | 0.5 | MAXXECUMINI-C1-F1 | — | — | — |
| H | Ignition 2 (coils 2+3, wasted spark) | — | W16 | — | 0.5 | MAXXECUMINI-C1-F2 | — | — | — |
| J | A/C relay | — | W21 | — | 0.5 | MAXXECUMINI-C1-G2 | — | — | — |
| M | Vehicle speed | — | W30 | — | 0.5 | MAXXECUMINI-C1-B1 | — | — | — |
| P | Power steering pressure switch | — | — | — | — | — | — | — | — |
| Q | A/C request | — | — | — | — | — | — | — | — |
| R | Cooling fan relay | — | W22 | — | 0.5 | MAXXECUMINI-C1-G1 | — | — | — |
| V | Neutral/clutch switch | — | — | — | — | — | — | — | — |
OEM-2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Power ground | — | W3 | — | 0.85 | SP-GND-1 | — | — | — |
| B | Power ground | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| C | Power ground | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| D | Power ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| E | Crank position (CAS NE) | — | W14 | — | 0.5 | MAXXECUMINI-C1-A1 | — | — | — |
| F | MAF ground | — | W8 | — | 0.5 | SP-0V-1 | — | — | — |
| G | Cam position (CAS G) | — | — | — | — | — | — | — | — |
| I | Tachometer output | — | — | — | — | — | — | — | — |
| K | +5V sensor supply | — | W13 | — | 0.5 | MAXXECUMINI-C1-E2 | — | — | — |
| M | Throttle position (TPS) | — | W26 | — | 0.5 | MAXXECUMINI-C1-D2 | — | — | — |
| N | O2 sensor | — | W27 | — | 0.5 | MAXXECUMINI-C1-C4 | — | — | — |
| O | Mass air flow (MAF) | — | W25 | — | 0.5 | MAXXECUMINI-C1-C3 | — | — | — |
| P | Intake air temperature (IAT) | — | W29 | — | 0.5 | MAXXECUMINI-C1-C2 | — | — | — |
| Q | Coolant temperature (ECT) | — | W28 | — | 0.5 | MAXXECUMINI-C1-C1 | — | — | — |
| R | PRC solenoid (fuel pressure regulator) | — | — | — | — | — | — | — | — |
| S | Condenser fan relay | — | W23 | — | 0.5 | MAXXECUMINI-C1-E1 | — | — | — |
| T | Fuel pump relay | — | W24 | — | 0.5 | MAXXECUMINI-C1-D1 | — | — | — |
| U | Injector 1 | — | W17 | — | 0.5 | MAXXECUMINI-C1-G3 | — | — | — |
| V | Injector 2 | — | W18 | — | 0.5 | MAXXECUMINI-C1-H1 | — | — | — |
| W | ISC solenoid | — | — | — | — | — | — | — | — |
| X | Evap purge solenoid | — | — | — | — | — | — | — | — |
| Y | Injector 3 | — | W19 | — | 0.5 | MAXXECUMINI-C1-H2 | — | — | — |
| Z | Injector 4 | — | W20 | — | 0.5 | MAXXECUMINI-C1-H3 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W8 | — | 0.5 | OEM-2-F | — | — | — |
| 1 | — | — | W9 | — | 0.5 | MAXXECUMINI-C1-A2 | — | — | — |
| 1 | — | — | W10 | — | 0.5 | MAXXECUMINI-C1-B3 | — | — | — |
| 1 | — | — | W11 | — | 0.5 | MAXXECUMINI-C1-B4 | — | — | — |
| 1 | — | — | W12 | — | 0.5 | MAXXECUMINI-C1-D4 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-1-B | — | — | — |
| 1 | — | — | W2 | — | 0.85 | MAXXECUMINI-C1-H4 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W3 | — | 0.85 | OEM-2-A | — | — | — |
| 1 | — | — | W4 | — | 0.85 | OEM-2-B | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-2-C | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-2-D | — | — | — |
| 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-1-A | Constant +12V | power_in | — | — | — | single_source | |
| OEM-1-B | ECU power +14V (main relay) | power_in | MAXXECUMINI-C1-H4 | +12V (ECU power supply) | power_in | single_source | |
| OEM-1-C | Start signal | digital_in | MAXXECUMINI-C1-B2 | DIN 2 (Hall only) | digital_in | single_source | |
| OEM-1-E | Malfunction indicator lamp (MIL) | low_side_out | — | — | — | single_source | |
| OEM-1-G | Ignition 1 (coils 1+4, wasted spark) | ignition_out | MAXXECUMINI-C1-F1 | IGN 1 | ignition_out | single_source | |
| OEM-1-H | Ignition 2 (coils 2+3, wasted spark) | ignition_out | MAXXECUMINI-C1-F2 | IGN 2 | ignition_out | single_source | |
| OEM-1-J | A/C relay | low_side_out | MAXXECUMINI-C1-G2 | GPO 1 | low_side_out | single_source | |
| OEM-1-M | Vehicle speed | digital_in | MAXXECUMINI-C1-B1 | DIN 1 (Hall only) | digital_in | single_source | |
| OEM-1-P | Power steering pressure switch | digital_in | — | — | — | single_source | |
| OEM-1-Q | A/C request | digital_in | — | — | — | single_source | |
| OEM-1-R | Cooling fan relay | low_side_out | MAXXECUMINI-C1-G1 | GPO 2 | low_side_out | single_source | |
| OEM-1-V | Neutral/clutch switch | digital_in | — | — | — | single_source | |
| OEM-2-A | Power ground | ground | MAXXECUMINI-C1-G4 | ENGINE GND | ground | single_source | |
| OEM-2-B | Power ground | ground | MAXXECUMINI-C1-G4 | ENGINE GND | ground | single_source | |
| OEM-2-C | Power ground | ground | MAXXECUMINI-C1-G4 | ENGINE GND | ground | single_source | |
| OEM-2-D | Power ground | ground | MAXXECUMINI-C1-G4 | ENGINE GND | ground | single_source | |
| OEM-2-E | Crank position (CAS NE) | trigger_in | MAXXECUMINI-C1-A1 | TRIGGER | trigger_in | single_source | |
| OEM-2-F | MAF 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-2-G | Cam position (CAS G) | trigger_in | — | — | — | single_source | |
| OEM-2-I | Tachometer output | tacho_out | — | — | — | single_source | |
| OEM-2-K | +5V sensor supply | vref | MAXXECUMINI-C1-E2 | +5V sensor supply | vref | single_source | |
| OEM-2-M | Throttle position (TPS) | analog_in | MAXXECUMINI-C1-D2 | TPS | analog_in | single_source | |
| OEM-2-N | O2 sensor | lambda_nb_in | MAXXECUMINI-C1-C4 | AIN 4 (0-5V) | analog_in | single_source | |
| OEM-2-O | Mass air flow (MAF) | analog_in | MAXXECUMINI-C1-C3 | AIN 3 (0-5V) | analog_in | single_source | |
| OEM-2-P | Intake air temperature (IAT) | temp_in | MAXXECUMINI-C1-C2 | IAT | temp_in | single_source | |
| OEM-2-Q | Coolant temperature (ECT) | temp_in | MAXXECUMINI-C1-C1 | CLT | temp_in | single_source | |
| OEM-2-R | PRC solenoid (fuel pressure regulator) | low_side_out | — | — | — | single_source | |
| OEM-2-S | Condenser fan relay | low_side_out | MAXXECUMINI-C1-E1 | GPO 3 | low_side_out | single_source | |
| OEM-2-T | Fuel pump relay | low_side_out | MAXXECUMINI-C1-D1 | GPO 8/TACHO | low_side_out | single_source | |
| OEM-2-U | Injector 1 | injector_out | MAXXECUMINI-C1-G3 | INJ 1 | injector_out | single_source | |
| OEM-2-V | Injector 2 | injector_out | MAXXECUMINI-C1-H1 | INJ 2 | injector_out | single_source | |
| OEM-2-W | ISC solenoid | low_side_out | — | — | — | single_source | |
| OEM-2-X | Evap purge solenoid | low_side_out | — | — | — | single_source | |
| OEM-2-Y | Injector 3 | injector_out | MAXXECUMINI-C1-H2 | INJ 3 | injector_out | single_source | |
| OEM-2-Z | Injector 4 | injector_out | MAXXECUMINI-C1-H3 | INJ 4 | injector_out | single_source |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-1-B | SP-14V-1 | 0.85 | no route | ECU power +14V (main relay) | — | |
| W2 | SP-14V-1 | MAXXECUMINI-C1-H4 | 0.85 | no route | +12V (ECU power supply) | — | |
| W3 | OEM-2-A | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W4 | OEM-2-B | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W5 | OEM-2-C | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W6 | OEM-2-D | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W7 | SP-GND-1 | MAXXECUMINI-C1-G4 | 0.85 | no route | ENGINE GND | — | |
| W8 | OEM-2-F | SP-0V-1 | 0.5 | no route | MAF ground | — | |
| W9 | SP-0V-1 | MAXXECUMINI-C1-A2 | 0.5 | no route | TRIGGER GND | — | |
| W10 | SP-0V-1 | MAXXECUMINI-C1-B3 | 0.5 | no route | SENSOR GND | — | |
| W11 | SP-0V-1 | MAXXECUMINI-C1-B4 | 0.5 | no route | SENSOR GND | — | |
| W12 | SP-0V-1 | MAXXECUMINI-C1-D4 | 0.5 | no route | SENSOR GND | — | |
| W13 | OEM-2-K | MAXXECUMINI-C1-E2 | 0.5 | no route | +5V sensor supply | — | |
| W14 | OEM-2-E | MAXXECUMINI-C1-A1 | 0.5 | no route | Crank position (CAS NE) | — | |
| W15 | OEM-1-G | MAXXECUMINI-C1-F1 | 0.5 | no route | Ignition 1 (coils 1+4, wasted spark) | — | |
| W16 | OEM-1-H | MAXXECUMINI-C1-F2 | 0.5 | no route | Ignition 2 (coils 2+3, wasted spark) | — | |
| W17 | OEM-2-U | MAXXECUMINI-C1-G3 | 0.5 | no route | Injector 1 | — | |
| W18 | OEM-2-V | MAXXECUMINI-C1-H1 | 0.5 | no route | Injector 2 | — | |
| W19 | OEM-2-Y | MAXXECUMINI-C1-H2 | 0.5 | no route | Injector 3 | — | |
| W20 | OEM-2-Z | MAXXECUMINI-C1-H3 | 0.5 | no route | Injector 4 | — | |
| W21 | OEM-1-J | MAXXECUMINI-C1-G2 | 0.5 | no route | A/C relay | — | |
| W22 | OEM-1-R | MAXXECUMINI-C1-G1 | 0.5 | no route | Cooling fan relay | — | |
| W23 | OEM-2-S | MAXXECUMINI-C1-E1 | 0.5 | no route | Condenser fan relay | — | |
| W24 | OEM-2-T | MAXXECUMINI-C1-D1 | 0.5 | no route | Fuel pump relay | — | |
| W25 | OEM-2-O | MAXXECUMINI-C1-C3 | 0.5 | no route | Mass air flow (MAF) | — | |
| W26 | OEM-2-M | MAXXECUMINI-C1-D2 | 0.5 | no route | Throttle position (TPS) | — | |
| W27 | OEM-2-N | MAXXECUMINI-C1-C4 | 0.5 | no route | O2 sensor | — | |
| W28 | OEM-2-Q | MAXXECUMINI-C1-C1 | 0.5 | no route | Coolant temperature (ECT) | — | |
| W29 | OEM-2-P | MAXXECUMINI-C1-C2 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W30 | OEM-1-M | MAXXECUMINI-C1-B1 | 0.5 | no route | Vehicle speed | — | |
| W31 | OEM-1-C | MAXXECUMINI-C1-B2 | 0.5 | no route | Start signal | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|---|---|---|---|---|
| connector | 174515-6 | TE | AMP Multilock .040/.070 hybrid 22-pin female harness plug (Miata NA/NB ECU) | 1.000 | ea |
| connector | 174516-6 | TE | AMP Multilock .040/.070 hybrid 26-pin female harness plug (Miata NA/NB ECU) | 1.000 | ea |
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-2-G | Required OEM function "Cam 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-2-T 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-2-S Condenser fan 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-1-R Cooling fan 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-1-J A/C relay (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| info | UNMAPPED | OEM | 8 optional OEM pins are not mapped: OEM-1-E Malfunction indicator lamp (MIL); OEM-1-P Power steering pressure switch; OEM-1-Q A/C request; OEM-1-V Neutral/clutch switch; OEM-2-I Tachometer output; OEM-2-R PRC solenoid (fuel pressure regulator); OEM-2-W ISC solenoid; OEM-2-X Evap purge solenoid |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-1-A | 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: unconfirmed. Confirm these before building: - Trigger pattern for Mazda BP-ZE not found in the ECU's docs (only a modified "MX5 NA cam trigger with missing tooth" entry) Auto-mapped by auto_map() from the library pin data on 2026-10-06. Review every wire against both manuals before building. Open items: - OEM-2 G: Cam position (CAS G): no free cam_hall/cam_vr/frequency_in input on MaxxECU MaxxECU MINI Not wired: - OEM-1 A: Constant +12V: MaxxECU MaxxECU MINI has no battery-constant input; not needed - OEM-2 W: ISC solenoid: no free low_side/ls_hs/injector/hbridge rated ≥ 1.0 A on MaxxECU MaxxECU MINI - OEM-1 E: Malfunction indicator lamp (MIL): no free low_side/ls_hs/injector/hbridge on MaxxECU MaxxECU MINI - OEM-2 R: PRC solenoid (fuel pressure regulator): no free low_side/ls_hs/injector/hbridge on MaxxECU MaxxECU MINI - OEM-2 X: Evap purge solenoid: no free low_side/ls_hs/injector/hbridge on MaxxECU MaxxECU MINI - OEM-2 I: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on MaxxECU MaxxECU MINI - OEM-1 P: Power steering pressure switch: no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU MINI - OEM-1 Q: A/C request: no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU MINI - OEM-1 V: Neutral/clutch 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 | Link G4X MX5X install manual (NA 1.6/1.8) | https://linkecu.com/documentation/MX5X.pdf | archive | 2026-10-05 | b7f730de9f6e |
| 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 |