MX-5 Miata NA8 1996-97 (BP-ZE, 1.8, OBD-II) → MaxxECU MaxxECU SPORT REV9+ (auto)
MX-5 Miata NA8 1996-97 (BP-ZE, 1.8, OBD-II) — MaxxECU — MaxxECU SPORT
⚠ 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 | 1: read the Findings page before cutting any wire |
| Size of the job | 40 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 | MAXXECUSPORT-C1-M4 | 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 | MAXXECUSPORT-C1-L4 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | OEM-3-O | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-4-H | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-0V-1 | MAXXECUSPORT-C1-H1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-0V-1 | MAXXECUSPORT-C1-H2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-3-I | MAXXECUSPORT-C1-G1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-4-E | MAXXECUSPORT-C1-H3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-4-G | MAXXECUSPORT-C1-H4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-4-N | MAXXECUSPORT-C1-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-4-R | MAXXECUSPORT-C1-A3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-4-U | MAXXECUSPORT-C1-K1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-4-V | MAXXECUSPORT-C1-K2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-4-W | MAXXECUSPORT-C1-M1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-4-X | MAXXECUSPORT-C1-M2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-3-B | MAXXECUSPORT-C1-J3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-3-F | MAXXECUSPORT-C1-G2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-3-G | MAXXECUSPORT-C1-F1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-1-A | MAXXECUSPORT-C1-B4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-1-B | MAXXECUSPORT-C1-C4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-1-G | MAXXECUSPORT-C1-D4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-1-U | MAXXECUSPORT-C1-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-3-M | MAXXECUSPORT-C1-D1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-1-E | MAXXECUSPORT-C1-B1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-4-J | MAXXECUSPORT-C1-A4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-4-O | MAXXECUSPORT-C1-M3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-4-P | MAXXECUSPORT-C1-L3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-3-H | MAXXECUSPORT-C1-J4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-3-N | MAXXECUSPORT-C1-C1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-3-C | MAXXECUSPORT-C1-D2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-3-D | MAXXECUSPORT-C1-D3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-3-K | MAXXECUSPORT-C1-F2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-3-J | MAXXECUSPORT-C1-E4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-1-M | MAXXECUSPORT-C1-K3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-1-C | MAXXECUSPORT-C1-K4 | 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 | MAXXECUSPORT-C1-G1 | MAXXECUSPORT-C1-H1 | open (OL) | 5 V sensor reference must not touch sensor ground | |
| 2 | MAXXECUSPORT-C1-G1 | MAXXECUSPORT-C1-L4 | open (OL) | 5 V sensor reference must not touch power ground | |
| 3 | MAXXECUSPORT-C1-G1 | MAXXECUSPORT-C1-M4 | open (OL) | 5 V sensor reference must not touch +12 V supply | |
| 4 | MAXXECUSPORT-C1-H1 | MAXXECUSPORT-C1-M4 | open (OL) | sensor ground must not touch +12 V supply | |
| 5 | MAXXECUSPORT-C1-L4 | MAXXECUSPORT-C1-M4 | 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
MAXXECUSPORT-C1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A1 | GPO 4 | — | W27 | — | 0.5 | OEM-1-U | — | — | — |
| A2 | IGN 1 | — | W15 | — | 0.5 | OEM-4-N | — | — | — |
| A3 | IGN 2 | — | W16 | — | 0.5 | OEM-4-R | — | — | — |
| A4 | GPO 8/TACHO | — | W30 | — | 0.5 | OEM-4-J | — | — | — |
| B1 | GPO 5 | — | W29 | — | 0.5 | OEM-1-E | — | — | — |
| B2 | IGN 3 | — | — | — | — | — | — | — | — |
| B3 | IGN 4 | — | — | — | — | — | — | — | — |
| B4 | GPO 1 | — | W24 | — | 0.5 | OEM-1-A | — | — | — |
| C1 | AIN 5 (0-5V) | — | W34 | — | 0.5 | OEM-3-N | — | — | — |
| C2 | IGN 5 | — | — | — | — | — | — | — | — |
| C3 | IGN 6 | — | — | — | — | — | — | — | — |
| C4 | GPO 2 | — | W25 | — | 0.5 | OEM-1-B | — | — | — |
| D1 | WBO2 Heater- | — | W28 | — | 0.5 | OEM-3-M | — | — | — |
| D2 | AIN 6 (0-5V) | — | W35 | — | 0.5 | OEM-3-C | — | — | — |
| D3 | AIN 7 (0-5V) | — | W36 | — | 0.5 | OEM-3-D | — | — | — |
| D4 | GPO 3 | — | W26 | — | 0.5 | OEM-1-G | — | — | — |
| E1 | CAN H | — | — | — | — | — | — | — | — |
| E2 | CAN L | — | — | — | — | — | — | — | — |
| E3 | GND Shield | — | — | — | — | — | — | — | — |
| E4 | AIN 8 (0-5V) | — | W38 | — | 0.5 | OEM-3-J | — | — | — |
| F1 | CLT | — | W23 | — | 0.5 | OEM-3-G | — | — | — |
| F2 | IAT | — | W37 | — | 0.5 | OEM-3-K | — | — | — |
| F3 | WBO2 VREF | — | — | — | — | — | — | — | — |
| F4 | WBO2 VS | — | — | — | — | — | — | — | — |
| G1 | +5V sensor supply | — | W12 | — | 0.5 | OEM-3-I | — | — | — |
| G2 | TPS/AIN | — | W22 | — | 0.5 | OEM-3-F | — | — | — |
| 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-4-E | — | — | — |
| H4 | HOME | — | W14 | — | 0.5 | OEM-4-G | — | — | — |
| J1 | AIN 1 (temperature) | — | — | — | — | — | — | — | — |
| J2 | AIN 2 (Temperature) | — | — | — | — | — | — | — | — |
| J3 | AIN 3 (0-5V) | — | W21 | — | 0.5 | OEM-3-B | — | — | — |
| J4 | AIN 4 (0-5V) | — | W33 | — | 0.5 | OEM-3-H | — | — | — |
| K1 | INJ 1 | — | W17 | — | 0.5 | OEM-4-U | — | — | — |
| K2 | INJ 2 | — | W18 | — | 0.5 | OEM-4-V | — | — | — |
| K3 | DIN 1 | — | W39 | — | 0.5 | OEM-1-M | — | — | — |
| K4 | DIN 2 | — | W40 | — | 0.5 | OEM-1-C | — | — | — |
| L1 | GPO 11/Motor 1- | — | — | — | — | — | — | — | — |
| L2 | GPO 12/MOTOR 1+ | — | — | — | — | — | — | — | — |
| L3 | INJ 6 | — | W32 | — | 0.5 | OEM-4-P | — | — | — |
| L4 | Engine GND | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| M1 | INJ 3 | — | W19 | — | 0.5 | OEM-4-W | — | — | — |
| M2 | INJ 4 | — | W20 | — | 0.5 | OEM-4-X | — | — | — |
| M3 | INJ 5 | — | W31 | — | 0.5 | OEM-4-O | — | — | — |
| M4 | +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) | — | W24 | — | 0.5 | MAXXECUSPORT-C1-B4 | — | — | — |
| B | A/C condenser fan relay | — | W25 | — | 0.5 | MAXXECUSPORT-C1-C4 | — | — | — |
| C | Starter input (12V while cranking) | — | W40 | — | 0.5 | MAXXECUSPORT-C1-K4 | — | — | — |
| E | Check engine light (MIL) | — | W29 | — | 0.5 | MAXXECUSPORT-C1-B1 | — | — | — |
| G | A/C clutch relay | — | W26 | — | 0.5 | MAXXECUSPORT-C1-D4 | — | — | — |
| K | A/C pressure switch (A/C request) | — | — | — | — | — | — | — | — |
| L | Clutch switch | — | — | — | — | — | — | — | — |
| M | Vehicle speed sensor (VSS) | — | W39 | — | 0.5 | MAXXECUSPORT-C1-K3 | — | — | — |
| Q | Brake switch | — | — | — | — | — | — | — | — |
| U | Fuel pump relay (low-side) | — | W27 | — | 0.5 | MAXXECUSPORT-C1-A1 | — | — | — |
OEM-3
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| B | MAF sensor input | — | W21 | — | 0.5 | MAXXECUSPORT-C1-J3 | — | — | — |
| C | Front O2 sensor input | — | W35 | — | 0.5 | MAXXECUSPORT-C1-D2 | — | — | — |
| D | Rear O2 sensor input | — | W36 | — | 0.5 | MAXXECUSPORT-C1-D3 | — | — | — |
| F | Throttle position (TPS) | — | W22 | — | 0.5 | MAXXECUSPORT-C1-G2 | — | — | — |
| G | Engine coolant temp (CLT) | — | W23 | — | 0.5 | MAXXECUSPORT-C1-F1 | — | — | — |
| H | EGR boost sensor | — | W33 | — | 0.5 | MAXXECUSPORT-C1-J4 | — | — | — |
| I | +5V sensor reference | — | W12 | — | 0.5 | MAXXECUSPORT-C1-G1 | — | — | — |
| J | EGR valve position sensor | — | W38 | — | 0.5 | MAXXECUSPORT-C1-E4 | — | — | — |
| K | Intake air temp (IAT) | — | W37 | — | 0.5 | MAXXECUSPORT-C1-F2 | — | — | — |
| L | Idle switch (closed throttle) | — | — | — | — | — | — | — | — |
| M | Front O2 heater control | — | W28 | — | 0.5 | MAXXECUSPORT-C1-D1 | — | — | — |
| N | EGR boost sensor (2nd channel) | — | W34 | — | 0.5 | MAXXECUSPORT-C1-C1 | — | — | — |
| 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 | — | W13 | — | 0.5 | MAXXECUSPORT-C1-H3 | — | — | — |
| F | CAS SGT (cam trigger) | — | — | — | — | — | — | — | — |
| G | CAS SGC (cam sync) | — | W14 | — | 0.5 | MAXXECUSPORT-C1-H4 | — | — | — |
| H | Crank pickup timing ground (CKP gnd) | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| I | Permanent +12V (battery) | — | — | — | — | — | — | — | — |
| J | PRC solenoid (FPR control) | — | W30 | — | 0.5 | MAXXECUSPORT-C1-A4 | — | — | — |
| K | Chassis ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| L | Tachometer output | — | — | — | — | — | — | — | — |
| N | Ignition coil trigger (cyl 1&4) | — | W15 | — | 0.5 | MAXXECUSPORT-C1-A2 | — | — | — |
| O | EGR vent solenoid | — | W31 | — | 0.5 | MAXXECUSPORT-C1-M3 | — | — | — |
| P | EGR vacuum solenoid | — | W32 | — | 0.5 | MAXXECUSPORT-C1-L3 | — | — | — |
| Q | Idle air control (IAC) valve | — | — | — | — | — | — | — | — |
| R | Ignition coil trigger (cyl 2&3) | — | W16 | — | 0.5 | MAXXECUSPORT-C1-A3 | — | — | — |
| T | EVAP purge solenoid | — | — | — | — | — | — | — | — |
| U | Injector 1 (cyl 1) | — | W17 | — | 0.5 | MAXXECUSPORT-C1-K1 | — | — | — |
| V | Injector 2 (cyl 2) | — | W18 | — | 0.5 | MAXXECUSPORT-C1-K2 | — | — | — |
| W | Injector 3 (cyl 3) | — | W19 | — | 0.5 | MAXXECUSPORT-C1-M1 | — | — | — |
| X | Injector 4 (cyl 4) | — | W20 | — | 0.5 | MAXXECUSPORT-C1-M2 | — | — | — |
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 | MAXXECUSPORT-C1-H1 | — | — | — |
| 1 | — | — | W11 | — | 0.5 | MAXXECUSPORT-C1-H2 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-4-B | — | — | — |
| 1 | — | — | W2 | — | 0.85 | MAXXECUSPORT-C1-M4 | — | — | — |
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 | MAXXECUSPORT-C1-L4 | — | — | — |
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 | MAXXECUSPORT-C1-B4 | GPO 1 | low_side_out | corroborated | |
| OEM-1-B | A/C condenser fan relay | low_side_out | MAXXECUSPORT-C1-C4 | GPO 2 | low_side_out | corroborated | |
| OEM-1-C | Starter input (12V while cranking) | digital_in | MAXXECUSPORT-C1-K4 | DIN 2 | digital_in | corroborated | |
| OEM-1-E | Check engine light (MIL) | low_side_out | MAXXECUSPORT-C1-B1 | GPO 5 | low_side_out | corroborated | |
| OEM-1-G | A/C clutch relay | low_side_out | MAXXECUSPORT-C1-D4 | 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 | MAXXECUSPORT-C1-K3 | DIN 1 | digital_in | corroborated | |
| OEM-1-Q | Brake switch | digital_in | — | — | — | corroborated | |
| OEM-1-U | Fuel pump relay (low-side) | low_side_out | MAXXECUSPORT-C1-A1 | GPO 4 | low_side_out | corroborated | |
| OEM-3-B | MAF sensor input | analog_in | MAXXECUSPORT-C1-J3 | AIN 3 (0-5V) | analog_in | corroborated | |
| OEM-3-C | Front O2 sensor input | lambda_nb_in | MAXXECUSPORT-C1-D2 | AIN 6 (0-5V) | analog_in | corroborated | |
| OEM-3-D | Rear O2 sensor input | lambda_nb_in | MAXXECUSPORT-C1-D3 | AIN 7 (0-5V) | analog_in | corroborated | |
| OEM-3-F | Throttle position (TPS) | analog_in | MAXXECUSPORT-C1-G2 | TPS/AIN | analog_in | corroborated | |
| OEM-3-G | Engine coolant temp (CLT) | temp_in | MAXXECUSPORT-C1-F1 | CLT | temp_in | corroborated | |
| OEM-3-H | EGR boost sensor | analog_in | MAXXECUSPORT-C1-J4 | AIN 4 (0-5V) | analog_in | corroborated | |
| OEM-3-I | +5V sensor reference | vref | MAXXECUSPORT-C1-G1 | +5V sensor supply | vref | corroborated | |
| OEM-3-J | EGR valve position sensor | analog_in | MAXXECUSPORT-C1-E4 | AIN 8 (0-5V) | analog_in | corroborated | |
| OEM-3-K | Intake air temp (IAT) | temp_in | MAXXECUSPORT-C1-F2 | IAT | temp_in | corroborated | |
| OEM-3-L | Idle switch (closed throttle) | digital_in | — | — | — | corroborated | |
| OEM-3-M | Front O2 heater control | low_side_out | MAXXECUSPORT-C1-D1 | WBO2 Heater- | low_side_out | corroborated | |
| OEM-3-N | EGR boost sensor (2nd channel) | analog_in | MAXXECUSPORT-C1-C1 | AIN 5 (0-5V) | analog_in | corroborated | |
| OEM-3-O | Sensor ground | sensor_ground | MAXXECUSPORT-C1-H1 + MAXXECUSPORT-C1-H2 | Sensor GND + Trigger GND | sensor_ground | corroborated | |
| OEM-3-P | Power steering pressure switch | digital_in | — | — | — | corroborated | |
| OEM-4-A | Chassis ground | ground | MAXXECUSPORT-C1-L4 | Engine GND | ground | corroborated | |
| OEM-4-B | ECU power +12V (main relay) | power_in | MAXXECUSPORT-C1-M4 | +12V ECU power supply | power_in | corroborated | |
| OEM-4-C | Chassis ground | ground | MAXXECUSPORT-C1-L4 | Engine GND | ground | corroborated | |
| OEM-4-D | Chassis ground | ground | MAXXECUSPORT-C1-L4 | Engine GND | ground | corroborated | |
| OEM-4-E | Crank position (CKP) sensor | trigger_in | MAXXECUSPORT-C1-H3 | TRIGGER | trigger_in | corroborated | |
| OEM-4-F | CAS SGT (cam trigger) | trigger_in | — | — | — | corroborated | |
| OEM-4-G | CAS SGC (cam sync) | trigger_in | MAXXECUSPORT-C1-H4 | HOME | trigger_in | corroborated | |
| OEM-4-H | Crank pickup timing ground (CKP gnd) | sensor_ground | MAXXECUSPORT-C1-H1 + MAXXECUSPORT-C1-H2 | Sensor GND + Trigger GND | sensor_ground | corroborated | |
| OEM-4-I | Permanent +12V (battery) | power_in | — | — | — | corroborated | |
| OEM-4-J | PRC solenoid (FPR control) | low_side_out | MAXXECUSPORT-C1-A4 | GPO 8/TACHO | low_side_out | corroborated | |
| OEM-4-K | Chassis ground | ground | MAXXECUSPORT-C1-L4 | Engine GND | ground | corroborated | |
| OEM-4-L | Tachometer output | tacho_out | — | — | — | corroborated | |
| OEM-4-N | Ignition coil trigger (cyl 1&4) | ignition_out | MAXXECUSPORT-C1-A2 | IGN 1 | ignition_out | corroborated | |
| OEM-4-O | EGR vent solenoid | low_side_out | MAXXECUSPORT-C1-M3 | INJ 5 | injector_out | corroborated | |
| OEM-4-P | EGR vacuum solenoid | low_side_out | MAXXECUSPORT-C1-L3 | INJ 6 | injector_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 | MAXXECUSPORT-C1-A3 | IGN 2 | ignition_out | corroborated | |
| OEM-4-T | EVAP purge solenoid | low_side_out | — | — | — | corroborated | |
| OEM-4-U | Injector 1 (cyl 1) | injector_out | MAXXECUSPORT-C1-K1 | INJ 1 | injector_out | corroborated | |
| OEM-4-V | Injector 2 (cyl 2) | injector_out | MAXXECUSPORT-C1-K2 | INJ 2 | injector_out | corroborated | |
| OEM-4-W | Injector 3 (cyl 3) | injector_out | MAXXECUSPORT-C1-M1 | INJ 3 | injector_out | corroborated | |
| OEM-4-X | Injector 4 (cyl 4) | injector_out | MAXXECUSPORT-C1-M2 | 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 | MAXXECUSPORT-C1-M4 | 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 | MAXXECUSPORT-C1-L4 | 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 | MAXXECUSPORT-C1-H1 | 0.5 | no route | Sensor GND | — | |
| W11 | SP-0V-1 | MAXXECUSPORT-C1-H2 | 0.5 | no route | Trigger GND | — | |
| W12 | OEM-3-I | MAXXECUSPORT-C1-G1 | 0.5 | no route | +5V sensor reference | — | |
| W13 | OEM-4-E | MAXXECUSPORT-C1-H3 | 0.5 | no route | Crank position (CKP) sensor | — | |
| W14 | OEM-4-G | MAXXECUSPORT-C1-H4 | 0.5 | no route | CAS SGC (cam sync) | — | |
| W15 | OEM-4-N | MAXXECUSPORT-C1-A2 | 0.5 | no route | Ignition coil trigger (cyl 1&4) | — | |
| W16 | OEM-4-R | MAXXECUSPORT-C1-A3 | 0.5 | no route | Ignition coil trigger (cyl 2&3) | — | |
| W17 | OEM-4-U | MAXXECUSPORT-C1-K1 | 0.5 | no route | Injector 1 (cyl 1) | — | |
| W18 | OEM-4-V | MAXXECUSPORT-C1-K2 | 0.5 | no route | Injector 2 (cyl 2) | — | |
| W19 | OEM-4-W | MAXXECUSPORT-C1-M1 | 0.5 | no route | Injector 3 (cyl 3) | — | |
| W20 | OEM-4-X | MAXXECUSPORT-C1-M2 | 0.5 | no route | Injector 4 (cyl 4) | — | |
| W21 | OEM-3-B | MAXXECUSPORT-C1-J3 | 0.5 | no route | MAF sensor input | — | |
| W22 | OEM-3-F | MAXXECUSPORT-C1-G2 | 0.5 | no route | Throttle position (TPS) | — | |
| W23 | OEM-3-G | MAXXECUSPORT-C1-F1 | 0.5 | no route | Engine coolant temp (CLT) | — | |
| W24 | OEM-1-A | MAXXECUSPORT-C1-B4 | 0.5 | no route | Cooling fan relay (low-side) | — | |
| W25 | OEM-1-B | MAXXECUSPORT-C1-C4 | 0.5 | no route | A/C condenser fan relay | — | |
| W26 | OEM-1-G | MAXXECUSPORT-C1-D4 | 0.5 | no route | A/C clutch relay | — | |
| W27 | OEM-1-U | MAXXECUSPORT-C1-A1 | 0.5 | no route | Fuel pump relay (low-side) | — | |
| W28 | OEM-3-M | MAXXECUSPORT-C1-D1 | 0.5 | no route | Front O2 heater control | — | |
| W29 | OEM-1-E | MAXXECUSPORT-C1-B1 | 0.5 | no route | Check engine light (MIL) | — | |
| W30 | OEM-4-J | MAXXECUSPORT-C1-A4 | 0.5 | no route | PRC solenoid (FPR control) | — | |
| W31 | OEM-4-O | MAXXECUSPORT-C1-M3 | 0.5 | no route | EGR vent solenoid | — | |
| W32 | OEM-4-P | MAXXECUSPORT-C1-L3 | 0.5 | no route | EGR vacuum solenoid | — | |
| W33 | OEM-3-H | MAXXECUSPORT-C1-J4 | 0.5 | no route | EGR boost sensor | — | |
| W34 | OEM-3-N | MAXXECUSPORT-C1-C1 | 0.5 | no route | EGR boost sensor (2nd channel) | — | |
| W35 | OEM-3-C | MAXXECUSPORT-C1-D2 | 0.5 | no route | Front O2 sensor input | — | |
| W36 | OEM-3-D | MAXXECUSPORT-C1-D3 | 0.5 | no route | Rear O2 sensor input | — | |
| W37 | OEM-3-K | MAXXECUSPORT-C1-F2 | 0.5 | no route | Intake air temp (IAT) | — | |
| W38 | OEM-3-J | MAXXECUSPORT-C1-E4 | 0.5 | no route | EGR valve position sensor | — | |
| W39 | OEM-1-M | MAXXECUSPORT-C1-K3 | 0.5 | no route | Vehicle speed sensor (VSS) | — | |
| W40 | OEM-1-C | MAXXECUSPORT-C1-K4 | 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 (8)
| 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. |
| warn | LOAD_UNKNOWN | MAXXECUSPORT-C1-A1 | MAXXECUSPORT-C1-A1 "GPO 4" 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 | MAXXECUSPORT-C1-B4 | MAXXECUSPORT-C1-B4 "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. |
| warn | LOAD_UNKNOWN | MAXXECUSPORT-C1-C4 | MAXXECUSPORT-C1-C4 "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 | MAXXECUSPORT-C1-D4 | MAXXECUSPORT-C1-D4 "GPO 3" drives OEM-1-G A/C clutch relay (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| info | NET_FAMILY | OEM-4-O ↔ MAXXECUSPORT-C1-M3 | OEM-4-O "EGR vent solenoid" [low_side_out] is wired to MAXXECUSPORT-C1-M3 "INJ 5" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-4-P ↔ MAXXECUSPORT-C1-L3 | OEM-4-P "EGR vacuum solenoid" [low_side_out] is wired to MAXXECUSPORT-C1-L3 "INJ 6" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | UNMAPPED | OEM | 8 optional OEM pins are not mapped: OEM-1-K A/C pressure switch (A/C request); OEM-1-L Clutch switch; OEM-1-Q Brake switch; OEM-3-L Idle switch (closed throttle); OEM-3-P Power steering pressure switch; OEM-4-L Tachometer output; 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 F: CAS SGT (cam trigger): no free cam_hall/cam_vr/frequency_in input on MaxxECU MaxxECU SPORT Not wired: - OEM-4 I: Permanent +12V (battery): MaxxECU MaxxECU SPORT has no battery-constant input; not needed - OEM-4 Q: Idle air control (IAC) valve: no free low_side/relay_control/heater_low_side/ls_hs/injector on MaxxECU MaxxECU SPORT - OEM-4 T: EVAP purge solenoid: no free low_side/relay_control/heater_low_side/ls_hs/injector on MaxxECU MaxxECU SPORT - OEM-4 L: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on MaxxECU MaxxECU SPORT - OEM-1 K: A/C pressure switch (A/C request): no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU SPORT - OEM-1 L: Clutch switch: no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU SPORT - OEM-1 Q: Brake switch: no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU SPORT - OEM-3 L: Idle switch (closed throttle): no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU SPORT - OEM-3 P: Power steering pressure switch: no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU SPORT
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 | — | — | — |