MX-5 Miata NA8 1996-97 (BP-ZE, 1.8, OBD-II) → MaxxECU MaxxECU MINI REV10+ (auto)
MX-5 Miata NA8 1996-97 (BP-ZE, 1.8, OBD-II) — MaxxECU — MaxxECU MINI
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 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 | draft · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | 2: read the Findings page before cutting any wire |
| Size of the job | 32 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 | MAXXECUMINI-C1-H4 | 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 | MAXXECUMINI-C1-G4 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | OEM-3-O | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-4-H | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-0V-1 | MAXXECUMINI-C1-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-0V-1 | MAXXECUMINI-C1-B3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | SP-0V-1 | MAXXECUMINI-C1-B4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | SP-0V-1 | MAXXECUMINI-C1-D4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-3-I | MAXXECUMINI-C1-E2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-4-E | MAXXECUMINI-C1-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-4-N | MAXXECUMINI-C1-F1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-4-R | MAXXECUMINI-C1-F2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-4-U | MAXXECUMINI-C1-G3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-4-V | MAXXECUMINI-C1-H1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-4-W | MAXXECUMINI-C1-H2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-4-X | MAXXECUMINI-C1-H3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-3-B | MAXXECUMINI-C1-C3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-3-F | MAXXECUMINI-C1-D2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-3-G | MAXXECUMINI-C1-C1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-1-A | MAXXECUMINI-C1-G2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-1-B | MAXXECUMINI-C1-G1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-1-G | MAXXECUMINI-C1-E1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-1-U | MAXXECUMINI-C1-D1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-3-H | MAXXECUMINI-C1-C4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-3-K | MAXXECUMINI-C1-C2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-1-M | MAXXECUMINI-C1-B1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | 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-E2 | MAXXECUMINI-C1-A2 | open (OL) | 5 V sensor reference must not touch sensor ground | |
| 2 | MAXXECUMINI-C1-E2 | MAXXECUMINI-C1-G4 | open (OL) | 5 V sensor reference must not touch power ground | |
| 3 | MAXXECUMINI-C1-A2 | MAXXECUMINI-C1-H4 | open (OL) | sensor ground must not touch +12 V supply | |
| 4 | MAXXECUMINI-C1-E2 | MAXXECUMINI-C1-H4 | open (OL) | 5 V sensor reference must not touch +12 V supply | |
| 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 | — | W15 | — | 0.5 | OEM-4-E | — | — | — |
| A2 | TRIGGER GND | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| B1 | DIN 1 (Hall only) | — | W31 | — | 0.5 | OEM-1-M | — | — | — |
| B2 | DIN 2 (Hall only) | — | W32 | — | 0.5 | OEM-1-C | — | — | — |
| B3 | SENSOR GND | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| B4 | SENSOR GND | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| C1 | CLT | — | W24 | — | 0.5 | OEM-3-G | — | — | — |
| C2 | IAT | — | W30 | — | 0.5 | OEM-3-K | — | — | — |
| C3 | AIN 3 (0-5V) | — | W22 | — | 0.5 | OEM-3-B | — | — | — |
| C4 | AIN 4 (0-5V) | — | W29 | — | 0.5 | OEM-3-H | — | — | — |
| D1 | GPO 8/TACHO | — | W28 | — | 0.5 | OEM-1-U | — | — | — |
| D2 | TPS | — | W23 | — | 0.5 | OEM-3-F | — | — | — |
| D3 | GND Shield | — | — | — | — | — | — | — | — |
| D4 | SENSOR GND | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| E1 | GPO 3 | — | W27 | — | 0.5 | OEM-1-G | — | — | — |
| E2 | +5V sensor supply | — | W14 | — | 0.5 | OEM-3-I | — | — | — |
| E3 | CAN L | — | — | — | — | — | — | — | — |
| E4 | CAN H | — | — | — | — | — | — | — | — |
| F1 | IGN 1 | — | W16 | — | 0.5 | OEM-4-N | — | — | — |
| F2 | IGN 2 | — | W17 | — | 0.5 | OEM-4-R | — | — | — |
| F3 | IGN 3 | — | — | — | — | — | — | — | — |
| F4 | IGN 4 | — | — | — | — | — | — | — | — |
| G1 | GPO 2 | — | W26 | — | 0.5 | OEM-1-B | — | — | — |
| G2 | GPO 1 | — | W25 | — | 0.5 | OEM-1-A | — | — | — |
| G3 | INJ 1 | — | W18 | — | 0.5 | OEM-4-U | — | — | — |
| G4 | ENGINE GND | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| H1 | INJ 2 | — | W19 | — | 0.5 | OEM-4-V | — | — | — |
| H2 | INJ 3 | — | W20 | — | 0.5 | OEM-4-W | — | — | — |
| H3 | INJ 4 | — | W21 | — | 0.5 | OEM-4-X | — | — | — |
| 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 | Cooling fan relay (low-side) | — | W25 | — | 0.5 | MAXXECUMINI-C1-G2 | — | — | — |
| B | A/C condenser fan relay | — | W26 | — | 0.5 | MAXXECUMINI-C1-G1 | — | — | — |
| C | Starter input (12V while cranking) | — | W32 | — | 0.5 | MAXXECUMINI-C1-B2 | — | — | — |
| E | Check engine light (MIL) | — | — | — | — | — | — | — | — |
| G | A/C clutch relay | — | W27 | — | 0.5 | MAXXECUMINI-C1-E1 | — | — | — |
| K | A/C pressure switch (A/C request) | — | — | — | — | — | — | — | — |
| L | Clutch switch | — | — | — | — | — | — | — | — |
| M | Vehicle speed sensor (VSS) | — | W31 | — | 0.5 | MAXXECUMINI-C1-B1 | — | — | — |
| Q | Brake switch | — | — | — | — | — | — | — | — |
| U | Fuel pump relay (low-side) | — | W28 | — | 0.5 | MAXXECUMINI-C1-D1 | — | — | — |
OEM-3
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| B | MAF sensor input | — | W22 | — | 0.5 | MAXXECUMINI-C1-C3 | — | — | — |
| C | Front O2 sensor input | — | — | — | — | — | — | — | — |
| D | Rear O2 sensor input | — | — | — | — | — | — | — | — |
| F | Throttle position (TPS) | — | W23 | — | 0.5 | MAXXECUMINI-C1-D2 | — | — | — |
| G | Engine coolant temp (CLT) | — | W24 | — | 0.5 | MAXXECUMINI-C1-C1 | — | — | — |
| H | EGR boost sensor | — | W29 | — | 0.5 | MAXXECUMINI-C1-C4 | — | — | — |
| I | +5V sensor reference | — | W14 | — | 0.5 | MAXXECUMINI-C1-E2 | — | — | — |
| J | EGR valve position sensor | — | — | — | — | — | — | — | — |
| K | Intake air temp (IAT) | — | W30 | — | 0.5 | MAXXECUMINI-C1-C2 | — | — | — |
| L | Idle switch (closed throttle) | — | — | — | — | — | — | — | — |
| M | Front O2 heater control | — | — | — | — | — | — | — | — |
| N | EGR boost sensor (2nd channel) | — | — | — | — | — | — | — | — |
| O | Sensor ground | — | W8 | — | 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 | — | W15 | — | 0.5 | MAXXECUMINI-C1-A1 | — | — | — |
| F | CAS SGT (cam trigger) | — | — | — | — | — | — | — | — |
| G | CAS SGC (cam sync) | — | — | — | — | — | — | — | — |
| H | Crank pickup timing ground (CKP gnd) | — | W9 | — | 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 | MAXXECUMINI-C1-F1 | — | — | — |
| O | EGR vent solenoid | — | — | — | — | — | — | — | — |
| P | EGR vacuum solenoid | — | — | — | — | — | — | — | — |
| Q | Idle air control (IAC) valve | — | — | — | — | — | — | — | — |
| R | Ignition coil trigger (cyl 2&3) | — | W17 | — | 0.5 | MAXXECUMINI-C1-F2 | — | — | — |
| T | EVAP purge solenoid | — | — | — | — | — | — | — | — |
| U | Injector 1 (cyl 1) | — | W18 | — | 0.5 | MAXXECUMINI-C1-G3 | — | — | — |
| V | Injector 2 (cyl 2) | — | W19 | — | 0.5 | MAXXECUMINI-C1-H1 | — | — | — |
| W | Injector 3 (cyl 3) | — | W20 | — | 0.5 | MAXXECUMINI-C1-H2 | — | — | — |
| X | Injector 4 (cyl 4) | — | W21 | — | 0.5 | MAXXECUMINI-C1-H3 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W8 | — | 0.5 | OEM-3-O | — | — | — |
| 1 | — | — | W9 | — | 0.5 | OEM-4-H | — | — | — |
| 1 | — | — | W10 | — | 0.5 | MAXXECUMINI-C1-A2 | — | — | — |
| 1 | — | — | W11 | — | 0.5 | MAXXECUMINI-C1-B3 | — | — | — |
| 1 | — | — | W12 | — | 0.5 | MAXXECUMINI-C1-B4 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | MAXXECUMINI-C1-D4 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-4-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-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 | MAXXECUMINI-C1-G4 | — | — | — |
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 | MAXXECUMINI-C1-G2 | GPO 1 | low_side_out | corroborated | |
| OEM-1-B | A/C condenser fan relay | low_side_out | MAXXECUMINI-C1-G1 | GPO 2 | low_side_out | corroborated | |
| OEM-1-C | Starter input (12V while cranking) | digital_in | MAXXECUMINI-C1-B2 | DIN 2 (Hall only) | digital_in | corroborated | |
| OEM-1-E | Check engine light (MIL) | low_side_out | — | — | — | corroborated | |
| OEM-1-G | A/C clutch relay | low_side_out | MAXXECUMINI-C1-E1 | GPO 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 | MAXXECUMINI-C1-B1 | DIN 1 (Hall only) | digital_in | corroborated | |
| OEM-1-Q | Brake switch | digital_in | — | — | — | corroborated | |
| OEM-1-U | Fuel pump relay (low-side) | low_side_out | MAXXECUMINI-C1-D1 | GPO 8/TACHO | low_side_out | corroborated | |
| OEM-3-B | MAF sensor input | analog_in | MAXXECUMINI-C1-C3 | AIN 3 (0-5V) | 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 | MAXXECUMINI-C1-D2 | TPS | analog_in | corroborated | |
| OEM-3-G | Engine coolant temp (CLT) | temp_in | MAXXECUMINI-C1-C1 | CLT | temp_in | corroborated | |
| OEM-3-H | EGR boost sensor | analog_in | MAXXECUMINI-C1-C4 | AIN 4 (0-5V) | analog_in | corroborated | |
| OEM-3-I | +5V sensor reference | vref | MAXXECUMINI-C1-E2 | +5V sensor supply | vref | corroborated | |
| OEM-3-J | EGR valve position sensor | analog_in | — | — | — | corroborated | |
| OEM-3-K | Intake air temp (IAT) | temp_in | MAXXECUMINI-C1-C2 | IAT | temp_in | corroborated | |
| OEM-3-L | Idle switch (closed throttle) | digital_in | — | — | — | corroborated | |
| OEM-3-M | Front O2 heater control | low_side_out | — | — | — | corroborated | |
| OEM-3-N | EGR boost sensor (2nd channel) | analog_in | — | — | — | corroborated | |
| OEM-3-O | 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 | corroborated | |
| OEM-3-P | Power steering pressure switch | digital_in | — | — | — | corroborated | |
| OEM-4-A | Chassis ground | ground | MAXXECUMINI-C1-G4 | ENGINE GND | ground | corroborated | |
| OEM-4-B | ECU power +12V (main relay) | power_in | MAXXECUMINI-C1-H4 | +12V (ECU power supply) | power_in | corroborated | |
| OEM-4-C | Chassis ground | ground | MAXXECUMINI-C1-G4 | ENGINE GND | ground | corroborated | |
| OEM-4-D | Chassis ground | ground | MAXXECUMINI-C1-G4 | ENGINE GND | ground | corroborated | |
| OEM-4-E | Crank position (CKP) sensor | trigger_in | MAXXECUMINI-C1-A1 | TRIGGER | trigger_in | corroborated | |
| OEM-4-F | CAS SGT (cam trigger) | trigger_in | — | — | — | corroborated | |
| OEM-4-G | CAS SGC (cam sync) | trigger_in | — | — | — | corroborated | |
| OEM-4-H | Crank pickup timing ground (CKP gnd) | sensor_ground | MAXXECUMINI-C1-A2 + MAXXECUMINI-C1-B3 + MAXXECUMINI-C1-B4 + MAXXECUMINI-C1-D4 | TRIGGER GND + SENSOR GND + SENSOR GND + SENSOR GND | 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 | MAXXECUMINI-C1-G4 | ENGINE GND | ground | corroborated | |
| OEM-4-L | Tachometer output | tacho_out | — | — | — | corroborated | |
| OEM-4-N | Ignition coil trigger (cyl 1&4) | ignition_out | MAXXECUMINI-C1-F1 | IGN 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 | MAXXECUMINI-C1-F2 | IGN 2 | ignition_out | corroborated | |
| OEM-4-T | EVAP purge solenoid | low_side_out | — | — | — | corroborated | |
| OEM-4-U | Injector 1 (cyl 1) | injector_out | MAXXECUMINI-C1-G3 | INJ 1 | injector_out | corroborated | |
| OEM-4-V | Injector 2 (cyl 2) | injector_out | MAXXECUMINI-C1-H1 | INJ 2 | injector_out | corroborated | |
| OEM-4-W | Injector 3 (cyl 3) | injector_out | MAXXECUMINI-C1-H2 | INJ 3 | injector_out | corroborated | |
| OEM-4-X | Injector 4 (cyl 4) | injector_out | MAXXECUMINI-C1-H3 | INJ 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 | MAXXECUMINI-C1-H4 | 0.85 | no route | +12V (ECU power supply) | — | |
| 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 | MAXXECUMINI-C1-G4 | 0.85 | no route | ENGINE GND | — | |
| W8 | OEM-3-O | SP-0V-1 | 0.5 | no route | Sensor ground | — | |
| W9 | OEM-4-H | SP-0V-1 | 0.5 | no route | Crank pickup timing ground (CKP gnd) | — | |
| W10 | SP-0V-1 | MAXXECUMINI-C1-A2 | 0.5 | no route | TRIGGER GND | — | |
| W11 | SP-0V-1 | MAXXECUMINI-C1-B3 | 0.5 | no route | SENSOR GND | — | |
| W12 | SP-0V-1 | MAXXECUMINI-C1-B4 | 0.5 | no route | SENSOR GND | — | |
| W13 | SP-0V-1 | MAXXECUMINI-C1-D4 | 0.5 | no route | SENSOR GND | — | |
| W14 | OEM-3-I | MAXXECUMINI-C1-E2 | 0.5 | no route | +5V sensor reference | — | |
| W15 | OEM-4-E | MAXXECUMINI-C1-A1 | 0.5 | no route | Crank position (CKP) sensor | — | |
| W16 | OEM-4-N | MAXXECUMINI-C1-F1 | 0.5 | no route | Ignition coil trigger (cyl 1&4) | — | |
| W17 | OEM-4-R | MAXXECUMINI-C1-F2 | 0.5 | no route | Ignition coil trigger (cyl 2&3) | — | |
| W18 | OEM-4-U | MAXXECUMINI-C1-G3 | 0.5 | no route | Injector 1 (cyl 1) | — | |
| W19 | OEM-4-V | MAXXECUMINI-C1-H1 | 0.5 | no route | Injector 2 (cyl 2) | — | |
| W20 | OEM-4-W | MAXXECUMINI-C1-H2 | 0.5 | no route | Injector 3 (cyl 3) | — | |
| W21 | OEM-4-X | MAXXECUMINI-C1-H3 | 0.5 | no route | Injector 4 (cyl 4) | — | |
| W22 | OEM-3-B | MAXXECUMINI-C1-C3 | 0.5 | no route | MAF sensor input | — | |
| W23 | OEM-3-F | MAXXECUMINI-C1-D2 | 0.5 | no route | Throttle position (TPS) | — | |
| W24 | OEM-3-G | MAXXECUMINI-C1-C1 | 0.5 | no route | Engine coolant temp (CLT) | — | |
| W25 | OEM-1-A | MAXXECUMINI-C1-G2 | 0.5 | no route | Cooling fan relay (low-side) | — | |
| W26 | OEM-1-B | MAXXECUMINI-C1-G1 | 0.5 | no route | A/C condenser fan relay | — | |
| W27 | OEM-1-G | MAXXECUMINI-C1-E1 | 0.5 | no route | A/C clutch relay | — | |
| W28 | OEM-1-U | MAXXECUMINI-C1-D1 | 0.5 | no route | Fuel pump relay (low-side) | — | |
| W29 | OEM-3-H | MAXXECUMINI-C1-C4 | 0.5 | no route | EGR boost sensor | — | |
| W30 | OEM-3-K | MAXXECUMINI-C1-C2 | 0.5 | no route | Intake air temp (IAT) | — | |
| W31 | OEM-1-M | MAXXECUMINI-C1-B1 | 0.5 | no route | Vehicle speed sensor (VSS) | — | |
| W32 | OEM-1-C | MAXXECUMINI-C1-B2 | 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 (7)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | REQUIRED_UNMAPPED | OEM-4-F | Required OEM function "CAS SGT (cam trigger)" (trigger_in) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-4-G | Required OEM function "CAS SGC (cam sync)" (trigger_in) is not connected to the new ECU. |
| warn | LOAD_UNKNOWN | MAXXECUMINI-C1-D1 | MAXXECUMINI-C1-D1 "GPO 8/TACHO" 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 | MAXXECUMINI-C1-E1 | MAXXECUMINI-C1-E1 "GPO 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 | MAXXECUMINI-C1-G1 | MAXXECUMINI-C1-G1 "GPO 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 | MAXXECUMINI-C1-G2 | MAXXECUMINI-C1-G2 "GPO 1" drives OEM-1-A Cooling fan relay (low-side) (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| info | UNMAPPED | OEM | 17 optional OEM pins are not mapped: OEM-1-E Check engine light (MIL); 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-M Front O2 heater control; OEM-3-N EGR boost sensor (2nd channel); 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. Open items: - OEM-4 G: CAS SGC (cam sync): no free cam_hall/cam_vr/frequency_in input on MaxxECU MaxxECU MINI - OEM-4 F: CAS SGT (cam trigger): no free cam_hall/cam_vr/frequency_in input on MaxxECU MaxxECU MINI Not wired: - OEM-4 I: Permanent +12V (battery): MaxxECU MaxxECU MINI has no battery-constant input; not needed - OEM-3 M: Front O2 heater control: no free heater_low_side/low_side/relay_control/ls_hs/injector on MaxxECU MaxxECU MINI - OEM-1 E: Check engine light (MIL): no free low_side/relay_control/heater_low_side/ls_hs/injector on MaxxECU MaxxECU MINI - OEM-4 J: PRC solenoid (FPR control): no free low_side/relay_control/heater_low_side/ls_hs/injector on MaxxECU MaxxECU MINI - OEM-4 O: EGR vent solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on MaxxECU MaxxECU MINI - OEM-4 P: EGR vacuum solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on MaxxECU MaxxECU MINI - OEM-4 Q: Idle air control (IAC) valve: no free low_side/relay_control/heater_low_side/ls_hs/injector on MaxxECU MaxxECU MINI - OEM-4 T: EVAP purge solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on MaxxECU MaxxECU MINI - OEM-4 L: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on MaxxECU MaxxECU MINI - OEM-3 N: EGR boost sensor (2nd channel): no free map/analog_0_5 on MaxxECU MaxxECU MINI - OEM-3 C: Front O2 sensor input: no free o2_narrowband/analog_0_5 on MaxxECU MaxxECU MINI - OEM-3 D: Rear O2 sensor input: no free o2_narrowband/analog_0_5 on MaxxECU MaxxECU MINI - OEM-3 J: EGR valve position sensor: no free analog_0_5 on MaxxECU MaxxECU MINI - OEM-1 K: A/C pressure switch (A/C request): no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU MINI - OEM-1 L: Clutch switch: no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU MINI - OEM-1 Q: Brake switch: no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU MINI - OEM-3 L: Idle switch (closed throttle): no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU MINI - OEM-3 P: 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 | 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 | MaxxECU GEN1 pinout (MINI / STREET / SPORT / V1 / RACE / PRO) | http://www.maxxecu.com/webhelp/wirings-maxxecu_pinout.html | archive | 2026-10-05 | 2e37b6814690 |
| 3 | community_copy | Mellens.net: 1996 Mazda Miata wiring diagrams (FSM-derived) | http://www.mellens.net/mazda/mazda_miata_extra_manual/1996_wiring.pdf | — | — | — |