MX-5 Miata NA6 1990-93 (B6-ZE, 1.6) → MaxxECU MaxxECU RACE REV9+ (auto)
MX-5 Miata NA6 1990-93 (B6-ZE, 1.6) — MaxxECU — MaxxECU RACE
Drawn by Michael Gnankou · Rev 0 · proposal · 2026-10-08
Before you start
| Status | proposal · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | none |
| Size of the job | 32 wires · 7 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 | MAXXECURACE-C1-M4 | 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 | MAXXECURACE-C1-L4 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | MAXXECURACE-C2-G4 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-2-F | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-0V-1 | MAXXECURACE-C1-H1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-0V-1 | MAXXECURACE-C1-H2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-2-K | MAXXECURACE-C1-G1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-2-E | MAXXECURACE-C1-H3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-2-G | MAXXECURACE-C1-H4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-1-G | MAXXECURACE-C1-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-1-H | MAXXECURACE-C1-A3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-2-U | MAXXECURACE-C1-K1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-2-V | MAXXECURACE-C1-K2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-2-Y | MAXXECURACE-C1-M1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-2-Z | MAXXECURACE-C1-M2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-1-E | MAXXECURACE-C1-B4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-2-I | MAXXECURACE-C1-C4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-2-O | MAXXECURACE-C1-J3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-2-N | MAXXECURACE-C1-J4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-2-Q | MAXXECURACE-C1-J1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-2-P | MAXXECURACE-C1-J2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-1-C | MAXXECURACE-C1-K3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-1-N | MAXXECURACE-C1-K4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-1-P | MAXXECURACE-C2-F3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-1-Q | MAXXECURACE-C2-F4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-1-V | MAXXECURACE-C2-G3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-2-L | MAXXECURACE-C2-E4 | 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 | MAXXECURACE-C1-M4 | MAXXECURACE-C1-H1 | open (OL) | +12 V supply must not touch sensor ground | |
| 2 | MAXXECURACE-C1-M4 | MAXXECURACE-C1-L4 | open (OL) | +12 V supply must not touch power ground | |
| 3 | MAXXECURACE-C1-H1 | MAXXECURACE-C1-G1 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 4 | MAXXECURACE-C1-L4 | MAXXECURACE-C1-G1 | open (OL) | power ground must not touch 5 V sensor reference | |
| 5 | MAXXECURACE-C1-M4 | MAXXECURACE-C1-G1 | open (OL) | +12 V supply must not touch 5 V sensor reference |
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
MAXXECURACE-C1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A1 | GPO 5 | — | — | — | — | — | — | — | — |
| A2 | IGN 1 | — | W15 | — | 0.5 | OEM-1-G | — | — | — |
| A3 | IGN 2 | — | W16 | — | 0.5 | OEM-1-H | — | — | — |
| A4 | GPO 8/TACHO | — | — | — | — | — | — | — | — |
| B1 | GPO 6 | — | — | — | — | — | — | — | — |
| B2 | IGN 3 | — | — | — | — | — | — | — | — |
| B3 | IGN 4 | — | — | — | — | — | — | — | — |
| B4 | GPO 1 | — | W21 | — | 0.5 | OEM-1-E | — | — | — |
| C1 | GPO 7 | — | — | — | — | — | — | — | — |
| C2 | IGN 5 | — | — | — | — | — | — | — | — |
| C3 | IGN 6 | — | — | — | — | — | — | — | — |
| C4 | GPO 2 | — | W22 | — | 0.5 | OEM-2-I | — | — | — |
| D1 | WBO2 Heater- | — | — | — | — | — | — | — | — |
| D2 | IGN 7 | — | — | — | — | — | — | — | — |
| D3 | IGN 8 | — | — | — | — | — | — | — | — |
| D4 | GPO 3 | — | — | — | — | — | — | — | — |
| E1 | CAN H | — | — | — | — | — | — | — | — |
| E2 | CAN L | — | — | — | — | — | — | — | — |
| E3 | GND Shield | — | — | — | — | — | — | — | — |
| E4 | GPO 4 | — | — | — | — | — | — | — | — |
| F1 | CLT | — | — | — | — | — | — | — | — |
| F2 | IAT | — | — | — | — | — | — | — | — |
| F3 | WBO2 VREF | — | — | — | — | — | — | — | — |
| F4 | WBO2 VS | — | — | — | — | — | — | — | — |
| G1 | +5V sensor supply | — | W12 | — | 0.5 | OEM-2-K | — | — | — |
| G2 | TPS/AIN | — | — | — | — | — | — | — | — |
| G3 | WBO2 IP | — | — | — | — | — | — | — | — |
| G4 | WBO2 RCAL | — | — | — | — | — | — | — | — |
| H1 | Sensor GND | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| H2 | Trigger GND | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| H3 | TRIGGER | — | W13 | — | 0.5 | OEM-2-E | — | — | — |
| H4 | HOME | — | W14 | — | 0.5 | OEM-2-G | — | — | — |
| J1 | AIN 1 (temperature) | — | W25 | — | 0.5 | OEM-2-Q | — | — | — |
| J2 | AIN 2 (temperature) | — | W26 | — | 0.5 | OEM-2-P | — | — | — |
| J3 | AIN 3 (0-5V) | — | W23 | — | 0.5 | OEM-2-O | — | — | — |
| J4 | AIN 4 (0-5V) | — | W24 | — | 0.5 | OEM-2-N | — | — | — |
| K1 | INJ 1 | — | W17 | — | 0.5 | OEM-2-U | — | — | — |
| K2 | INJ 2 | — | W18 | — | 0.5 | OEM-2-V | — | — | — |
| K3 | DIN/VR 1 | — | W27 | — | 0.5 | OEM-1-C | — | — | — |
| K4 | DIN/VR 2 | — | W28 | — | 0.5 | OEM-1-N | — | — | — |
| L1 | INJ 8 | — | — | — | — | — | — | — | — |
| L2 | INJ 7 | — | — | — | — | — | — | — | — |
| L3 | INJ 6 | — | — | — | — | — | — | — | — |
| L4 | Engine GND | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| M1 | INJ 3 | — | W19 | — | 0.5 | OEM-2-Y | — | — | — |
| M2 | INJ 4 | — | W20 | — | 0.5 | OEM-2-Z | — | — | — |
| M3 | INJ 5 | — | — | — | — | — | — | — | — |
| M4 | +12V ECU power supply | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
MAXXECURACE-C2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A1 | EGT 5+ | — | — | — | — | — | — | — | — |
| A2 | EGT 6+ | — | — | — | — | — | — | — | — |
| A3 | EGT 7+ | — | — | — | — | — | — | — | — |
| A4 | EGT 8+ | — | — | — | — | — | — | — | — |
| B1 | EGT 5- | — | — | — | — | — | — | — | — |
| B2 | EGT 6- | — | — | — | — | — | — | — | — |
| B3 | EGT 7- | — | — | — | — | — | — | — | — |
| B4 | EGT 8- | — | — | — | — | — | — | — | — |
| C1 | EGT 1+ | — | — | — | — | — | — | — | — |
| C2 | EGT 2+ | — | — | — | — | — | — | — | — |
| C3 | EGT 3+ | — | — | — | — | — | — | — | — |
| C4 | EGT 4+ | — | — | — | — | — | — | — | — |
| D1 | EGT 1- | — | — | — | — | — | — | — | — |
| D2 | EGT 2- | — | — | — | — | — | — | — | — |
| D3 | EGT 3- | — | — | — | — | — | — | — | — |
| D4 | EGT 4- | — | — | — | — | — | — | — | — |
| E1 | KNOCK GND | — | — | — | — | — | — | — | — |
| E2 | Knock 1 | — | — | — | — | — | — | — | — |
| E3 | Knock 2 | — | — | — | — | — | — | — | — |
| E4 | AIN 6 (0-5V) | — | W32 | — | 0.5 | OEM-2-L | — | — | — |
| F1 | AIN 7 (0-5V) | — | — | — | — | — | — | — | — |
| F2 | AIN 8 (0-5V) | — | — | — | — | — | — | — | — |
| F3 | DIN/VR 4 | — | W29 | — | 0.5 | OEM-1-P | — | — | — |
| F4 | DIN/VR 5 | — | W30 | — | 0.5 | OEM-1-Q | — | — | — |
| G1 | GPO 15 (+12V) | — | — | — | — | — | — | — | — |
| G2 | GPO 16 (+12V) | — | — | — | — | — | — | — | — |
| G3 | AIN 5 (0-5V) | — | W31 | — | 0.5 | OEM-1-V | — | — | — |
| G4 | ENGINE GROUND | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| H1 | MOTOR 2+ | — | — | — | — | — | — | — | — |
| H2 | MOTOR 1- | — | — | — | — | — | — | — | — |
| H3 | MOTOR 2- | — | — | — | — | — | — | — | — |
| H4 | MOTOR 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 | — | W27 | — | 0.5 | MAXXECURACE-C1-K3 | — | — | — |
| E | Malfunction indicator lamp (MIL) | — | W21 | — | 0.5 | MAXXECURACE-C1-B4 | — | — | — |
| G | Ignition 1 (coils 1+4, wasted spark) | — | W15 | — | 0.5 | MAXXECURACE-C1-A2 | — | — | — |
| H | Ignition 2 (coils 2+3, wasted spark) | — | W16 | — | 0.5 | MAXXECURACE-C1-A3 | — | — | — |
| N | Wide-open throttle switch | — | W28 | — | 0.5 | MAXXECURACE-C1-K4 | — | — | — |
| P | Power steering pressure switch | — | W29 | — | 0.5 | MAXXECURACE-C2-F3 | — | — | — |
| Q | A/C request | — | W30 | — | 0.5 | MAXXECURACE-C2-F4 | — | — | — |
| V | Neutral/clutch switch | — | W31 | — | 0.5 | MAXXECURACE-C2-G3 | — | — | — |
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) | — | W13 | — | 0.5 | MAXXECURACE-C1-H3 | — | — | — |
| F | AFM ground | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| G | Cam position (CAS G) | — | W14 | — | 0.5 | MAXXECURACE-C1-H4 | — | — | — |
| I | Tachometer output | — | W22 | — | 0.5 | MAXXECURACE-C1-C4 | — | — | — |
| K | +5V sensor supply | — | W12 | — | 0.5 | MAXXECURACE-C1-G1 | — | — | — |
| L | Idle switch (TPS) | — | W32 | — | 0.5 | MAXXECURACE-C2-E4 | — | — | — |
| N | O2 sensor | — | W24 | — | 0.5 | MAXXECURACE-C1-J4 | — | — | — |
| O | Air flow meter (AFM) | — | W23 | — | 0.5 | MAXXECURACE-C1-J3 | — | — | — |
| P | Intake air temperature (IAT) | — | W26 | — | 0.5 | MAXXECURACE-C1-J2 | — | — | — |
| Q | Coolant temperature (ECT) | — | W25 | — | 0.5 | MAXXECURACE-C1-J1 | — | — | — |
| U | Injector 1 | — | W17 | — | 0.5 | MAXXECURACE-C1-K1 | — | — | — |
| V | Injector 2 | — | W18 | — | 0.5 | MAXXECURACE-C1-K2 | — | — | — |
| Y | Injector 3 | — | W19 | — | 0.5 | MAXXECURACE-C1-M1 | — | — | — |
| Z | Injector 4 | — | W20 | — | 0.5 | MAXXECURACE-C1-M2 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W9 | — | 0.5 | OEM-2-F | — | — | — |
| 1 | — | — | W10 | — | 0.5 | MAXXECURACE-C1-H1 | — | — | — |
| 1 | — | — | W11 | — | 0.5 | MAXXECURACE-C1-H2 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-1-B | — | — | — |
| 1 | — | — | W2 | — | 0.85 | MAXXECURACE-C1-M4 | — | — | — |
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 | MAXXECURACE-C1-L4 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | MAXXECURACE-C2-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 | MAXXECURACE-C1-M4 | +12V ECU power supply | power_in | single_source | |
| OEM-1-C | Start signal | digital_in | MAXXECURACE-C1-K3 | DIN/VR 1 | digital_in | single_source | |
| OEM-1-E | Malfunction indicator lamp (MIL) | low_side_out | MAXXECURACE-C1-B4 | GPO 1 | low_side_out | single_source | |
| OEM-1-G | Ignition 1 (coils 1+4, wasted spark) | ignition_out | MAXXECURACE-C1-A2 | IGN 1 | ignition_out | single_source | |
| OEM-1-H | Ignition 2 (coils 2+3, wasted spark) | ignition_out | MAXXECURACE-C1-A3 | IGN 2 | ignition_out | single_source | |
| OEM-1-N | Wide-open throttle switch | digital_in | MAXXECURACE-C1-K4 | DIN/VR 2 | digital_in | single_source | |
| OEM-1-P | Power steering pressure switch | digital_in | MAXXECURACE-C2-F3 | DIN/VR 4 | digital_in | single_source | |
| OEM-1-Q | A/C request | digital_in | MAXXECURACE-C2-F4 | DIN/VR 5 | digital_in | single_source | |
| OEM-1-V | Neutral/clutch switch | digital_in | MAXXECURACE-C2-G3 | AIN 5 (0-5V) | analog_in | single_source | |
| OEM-2-A | Power ground | ground | MAXXECURACE-C1-L4 + MAXXECURACE-C2-G4 | Engine GND + ENGINE GROUND | ground | single_source | |
| OEM-2-B | Power ground | ground | MAXXECURACE-C1-L4 + MAXXECURACE-C2-G4 | Engine GND + ENGINE GROUND | ground | single_source | |
| OEM-2-C | Power ground | ground | MAXXECURACE-C1-L4 + MAXXECURACE-C2-G4 | Engine GND + ENGINE GROUND | ground | single_source | |
| OEM-2-D | Power ground | ground | MAXXECURACE-C1-L4 + MAXXECURACE-C2-G4 | Engine GND + ENGINE GROUND | ground | single_source | |
| OEM-2-E | Crank position (CAS NE) | trigger_in | MAXXECURACE-C1-H3 | TRIGGER | trigger_in | single_source | |
| OEM-2-F | AFM ground | sensor_ground | MAXXECURACE-C1-H1 + MAXXECURACE-C1-H2 | Sensor GND + Trigger GND | sensor_ground | single_source | |
| OEM-2-G | Cam position (CAS G) | trigger_in | MAXXECURACE-C1-H4 | HOME | trigger_in | single_source | |
| OEM-2-I | Tachometer output | tacho_out | MAXXECURACE-C1-C4 | GPO 2 | low_side_out | single_source | |
| OEM-2-K | +5V sensor supply | vref | MAXXECURACE-C1-G1 | +5V sensor supply | vref | single_source | |
| OEM-2-L | Idle switch (TPS) | digital_in | MAXXECURACE-C2-E4 | AIN 6 (0-5V) | analog_in | single_source | |
| OEM-2-N | O2 sensor | lambda_nb_in | MAXXECURACE-C1-J4 | AIN 4 (0-5V) | analog_in | single_source | |
| OEM-2-O | Air flow meter (AFM) | analog_in | MAXXECURACE-C1-J3 | AIN 3 (0-5V) | analog_in | single_source | |
| OEM-2-P | Intake air temperature (IAT) | temp_in | MAXXECURACE-C1-J2 | AIN 2 (temperature) | temp_in | single_source | |
| OEM-2-Q | Coolant temperature (ECT) | temp_in | MAXXECURACE-C1-J1 | AIN 1 (temperature) | temp_in | single_source | |
| OEM-2-U | Injector 1 | injector_out | MAXXECURACE-C1-K1 | INJ 1 | injector_out | single_source | |
| OEM-2-V | Injector 2 | injector_out | MAXXECURACE-C1-K2 | INJ 2 | injector_out | single_source | |
| OEM-2-Y | Injector 3 | injector_out | MAXXECURACE-C1-M1 | INJ 3 | injector_out | single_source | |
| OEM-2-Z | Injector 4 | injector_out | MAXXECURACE-C1-M2 | 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 | MAXXECURACE-C1-M4 | 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 | MAXXECURACE-C1-L4 | 0.85 | no route | Engine GND | — | |
| W8 | SP-GND-1 | MAXXECURACE-C2-G4 | 0.85 | no route | ENGINE GROUND | — | |
| W9 | OEM-2-F | SP-0V-1 | 0.5 | no route | AFM ground | — | |
| W10 | SP-0V-1 | MAXXECURACE-C1-H1 | 0.5 | no route | Sensor GND | — | |
| W11 | SP-0V-1 | MAXXECURACE-C1-H2 | 0.5 | no route | Trigger GND | — | |
| W12 | OEM-2-K | MAXXECURACE-C1-G1 | 0.5 | no route | +5V sensor supply | — | |
| W13 | OEM-2-E | MAXXECURACE-C1-H3 | 0.5 | no route | Crank position (CAS NE) | — | |
| W14 | OEM-2-G | MAXXECURACE-C1-H4 | 0.5 | no route | Cam position (CAS G) | — | |
| W15 | OEM-1-G | MAXXECURACE-C1-A2 | 0.5 | no route | Ignition 1 (coils 1+4, wasted spark) | — | |
| W16 | OEM-1-H | MAXXECURACE-C1-A3 | 0.5 | no route | Ignition 2 (coils 2+3, wasted spark) | — | |
| W17 | OEM-2-U | MAXXECURACE-C1-K1 | 0.5 | no route | Injector 1 | — | |
| W18 | OEM-2-V | MAXXECURACE-C1-K2 | 0.5 | no route | Injector 2 | — | |
| W19 | OEM-2-Y | MAXXECURACE-C1-M1 | 0.5 | no route | Injector 3 | — | |
| W20 | OEM-2-Z | MAXXECURACE-C1-M2 | 0.5 | no route | Injector 4 | — | |
| W21 | OEM-1-E | MAXXECURACE-C1-B4 | 0.5 | no route | Malfunction indicator lamp (MIL) | — | |
| W22 | OEM-2-I | MAXXECURACE-C1-C4 | 0.5 | no route | Tachometer output | — | |
| W23 | OEM-2-O | MAXXECURACE-C1-J3 | 0.5 | no route | Air flow meter (AFM) | — | |
| W24 | OEM-2-N | MAXXECURACE-C1-J4 | 0.5 | no route | O2 sensor | — | |
| W25 | OEM-2-Q | MAXXECURACE-C1-J1 | 0.5 | no route | Coolant temperature (ECT) | — | |
| W26 | OEM-2-P | MAXXECURACE-C1-J2 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W27 | OEM-1-C | MAXXECURACE-C1-K3 | 0.5 | no route | Start signal | — | |
| W28 | OEM-1-N | MAXXECURACE-C1-K4 | 0.5 | no route | Wide-open throttle switch | — | |
| W29 | OEM-1-P | MAXXECURACE-C2-F3 | 0.5 | no route | Power steering pressure switch | — | |
| W30 | OEM-1-Q | MAXXECURACE-C2-F4 | 0.5 | no route | A/C request | — | |
| W31 | OEM-1-V | MAXXECURACE-C2-G3 | 0.5 | no route | Neutral/clutch switch | — | |
| W32 | OEM-2-L | MAXXECURACE-C2-E4 | 0.5 | no route | Idle switch (TPS) | — |
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 (3)
| Severity | Code | Subject | Message |
|---|---|---|---|
| warn | NET_FAMILY | OEM-1-V ↔ MAXXECURACE-C2-G3 | OEM-1-V "Neutral/clutch switch" [digital_in] is wired to MAXXECURACE-C2-G3 "AIN 5 (0-5V)" [analog_in]. Analog and digital on one net. A switch on an analog input works with a pull-up and a threshold; an analog sensor on a digital input loses its value. |
| warn | NET_FAMILY | OEM-2-L ↔ MAXXECURACE-C2-E4 | OEM-2-L "Idle switch (TPS)" [digital_in] is wired to MAXXECURACE-C2-E4 "AIN 6 (0-5V)" [analog_in]. Analog and digital on one net. A switch on an analog input works with a pull-up and a threshold; an analog sensor on a digital input loses its value. |
| info | NET_FAMILY | OEM-2-I ↔ MAXXECURACE-C1-C4 | OEM-2-I "Tachometer output" [tacho_out] is wired to MAXXECURACE-C1-C4 "GPO 2" [low_side_out]. Tacho as a low-side output: check the tach needs a pull-up. |
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
Auto-mapped by auto_map() from the library pin data on 2026-10-06. Review every wire against both manuals before building. Not wired: - OEM-1 A: Constant +12V: MaxxECU MaxxECU RACE has no battery-constant input; not needed
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 |