MX-5 Miata NB2 2001-05 (BP-Z3, VVT) → MaxxECU MaxxECU SPORT REV9+ (auto)
MX-5 Miata NB2 2001-05 (BP-Z3, VVT) — MaxxECU — MaxxECU SPORT
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 | 41 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-2-P | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | OEM-4-AF | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-14V-1 | MAXXECUSPORT-C1-M4 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-3-A | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-3-B | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-4-A | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | SP-GND-1 | MAXXECUSPORT-C1-L4 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | OEM-4-O | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-0V-1 | MAXXECUSPORT-C1-H1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-0V-1 | MAXXECUSPORT-C1-H2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-4-L | MAXXECUSPORT-C1-G1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-3-Y | MAXXECUSPORT-C1-H3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-3-V | MAXXECUSPORT-C1-H4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-3-F | MAXXECUSPORT-C1-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-3-I | MAXXECUSPORT-C1-A3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-2-A | MAXXECUSPORT-C1-K1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-2-D | MAXXECUSPORT-C1-K2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-2-G | MAXXECUSPORT-C1-M1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-2-J | MAXXECUSPORT-C1-M2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-2-B | MAXXECUSPORT-C1-B4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-2-C | MAXXECUSPORT-C1-C4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-2-K | MAXXECUSPORT-C1-D4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-2-M | MAXXECUSPORT-C1-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-3-H | MAXXECUSPORT-C1-B1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-3-J | MAXXECUSPORT-C1-D1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-3-P | MAXXECUSPORT-C1-A4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-2-Q | MAXXECUSPORT-C1-M3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-2-E | MAXXECUSPORT-C1-L3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-2-F | MAXXECUSPORT-C1-L1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-2-H | MAXXECUSPORT-C1-L2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-4-X | MAXXECUSPORT-C1-J3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-4-V | MAXXECUSPORT-C1-G2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-4-AA | MAXXECUSPORT-C1-J4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-4-W | MAXXECUSPORT-C1-C1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-4-P | MAXXECUSPORT-C1-J1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-4-N | MAXXECUSPORT-C1-J2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-4-AD | MAXXECUSPORT-C1-D2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-3-T | MAXXECUSPORT-C1-K3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-3-S | MAXXECUSPORT-C1-K4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-4-B | MAXXECUSPORT-C1-D3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-4-C | MAXXECUSPORT-C1-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 | MAXXECUSPORT-C1-G1 | MAXXECUSPORT-C1-H1 | open (OL) | 5 V sensor reference must not touch sensor ground | |
| 2 | MAXXECUSPORT-C1-M4 | MAXXECUSPORT-C1-H1 | open (OL) | +12 V supply must not touch sensor ground | |
| 3 | MAXXECUSPORT-C1-M4 | MAXXECUSPORT-C1-L4 | open (OL) | +12 V supply must not touch power ground | |
| 4 | MAXXECUSPORT-C1-L4 | MAXXECUSPORT-C1-G1 | open (OL) | power ground must not touch 5 V sensor reference | |
| 5 | MAXXECUSPORT-C1-M4 | MAXXECUSPORT-C1-G1 | open (OL) | +12 V supply must not touch 5 V sensor reference |
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 | — | W23 | — | 0.5 | OEM-2-M | — | — | — |
| A2 | IGN 1 | — | W14 | — | 0.5 | OEM-3-F | — | — | — |
| A3 | IGN 2 | — | W15 | — | 0.5 | OEM-3-I | — | — | — |
| A4 | GPO 8/TACHO | — | W26 | — | 0.5 | OEM-3-P | — | — | — |
| B1 | GPO 5 | — | W24 | — | 0.5 | OEM-3-H | — | — | — |
| B2 | IGN 3 | — | — | — | — | — | — | — | — |
| B3 | IGN 4 | — | — | — | — | — | — | — | — |
| B4 | GPO 1 | — | W20 | — | 0.5 | OEM-2-B | — | — | — |
| C1 | AIN 5 (0-5V) | — | W34 | — | 0.5 | OEM-4-W | — | — | — |
| C2 | IGN 5 | — | — | — | — | — | — | — | — |
| C3 | IGN 6 | — | — | — | — | — | — | — | — |
| C4 | GPO 2 | — | W21 | — | 0.5 | OEM-2-C | — | — | — |
| D1 | WBO2 Heater- | — | W25 | — | 0.5 | OEM-3-J | — | — | — |
| D2 | AIN 6 (0-5V) | — | W37 | — | 0.5 | OEM-4-AD | — | — | — |
| D3 | AIN 7 (0-5V) | — | W40 | — | 0.5 | OEM-4-B | — | — | — |
| D4 | GPO 3 | — | W22 | — | 0.5 | OEM-2-K | — | — | — |
| E1 | CAN H | — | — | — | — | — | — | — | — |
| E2 | CAN L | — | — | — | — | — | — | — | — |
| E3 | GND Shield | — | — | — | — | — | — | — | — |
| E4 | AIN 8 (0-5V) | — | W41 | — | 0.5 | OEM-4-C | — | — | — |
| F1 | CLT | — | — | — | — | — | — | — | — |
| F2 | IAT | — | — | — | — | — | — | — | — |
| F3 | WBO2 VREF | — | — | — | — | — | — | — | — |
| F4 | WBO2 VS | — | — | — | — | — | — | — | — |
| G1 | +5V sensor supply | — | W11 | — | 0.5 | OEM-4-L | — | — | — |
| G2 | TPS/AIN | — | W32 | — | 0.5 | OEM-4-V | — | — | — |
| G3 | WBO2 IP | — | — | — | — | — | — | — | — |
| G4 | WBO2 RCAL | — | — | — | — | — | — | — | — |
| H1 | Sensor GND | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| H2 | Trigger GND | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| H3 | TRIGGER | — | W12 | — | 0.5 | OEM-3-Y | — | — | — |
| H4 | HOME | — | W13 | — | 0.5 | OEM-3-V | — | — | — |
| J1 | AIN 1 (temperature) | — | W35 | — | 0.5 | OEM-4-P | — | — | — |
| J2 | AIN 2 (Temperature) | — | W36 | — | 0.5 | OEM-4-N | — | — | — |
| J3 | AIN 3 (0-5V) | — | W31 | — | 0.5 | OEM-4-X | — | — | — |
| J4 | AIN 4 (0-5V) | — | W33 | — | 0.5 | OEM-4-AA | — | — | — |
| K1 | INJ 1 | — | W16 | — | 0.5 | OEM-2-A | — | — | — |
| K2 | INJ 2 | — | W17 | — | 0.5 | OEM-2-D | — | — | — |
| K3 | DIN 1 | — | W38 | — | 0.5 | OEM-3-T | — | — | — |
| K4 | DIN 2 | — | W39 | — | 0.5 | OEM-3-S | — | — | — |
| L1 | GPO 11/Motor 1- | — | W29 | — | 0.5 | OEM-2-F | — | — | — |
| L2 | GPO 12/MOTOR 1+ | — | W30 | — | 0.5 | OEM-2-H | — | — | — |
| L3 | INJ 6 | — | W28 | — | 0.5 | OEM-2-E | — | — | — |
| L4 | Engine GND | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| M1 | INJ 3 | — | W18 | — | 0.5 | OEM-2-G | — | — | — |
| M2 | INJ 4 | — | W19 | — | 0.5 | OEM-2-J | — | — | — |
| M3 | INJ 5 | — | W27 | — | 0.5 | OEM-2-Q | — | — | — |
| M4 | +12V ECU power supply | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
OEM-2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Injector 1 | — | W16 | — | 0.5 | MAXXECUSPORT-C1-K1 | — | — | — |
| B | Cooling fan relay | — | W20 | — | 0.5 | MAXXECUSPORT-C1-B4 | — | — | — |
| C | Condenser fan relay | — | W21 | — | 0.5 | MAXXECUSPORT-C1-C4 | — | — | — |
| D | Injector 2 | — | W17 | — | 0.5 | MAXXECUSPORT-C1-K2 | — | — | — |
| E | EGR valve | — | W28 | — | 0.5 | MAXXECUSPORT-C1-L3 | — | — | — |
| F | EGR valve | — | W29 | — | 0.5 | MAXXECUSPORT-C1-L1 | — | — | — |
| G | Injector 3 | — | W18 | — | 0.5 | MAXXECUSPORT-C1-M1 | — | — | — |
| H | EGR valve | — | W30 | — | 0.5 | MAXXECUSPORT-C1-L2 | — | — | — |
| I | EGR valve | — | — | — | — | — | — | — | — |
| J | Injector 4 | — | W19 | — | 0.5 | MAXXECUSPORT-C1-M2 | — | — | — |
| K | A/C clutch relay | — | W22 | — | 0.5 | MAXXECUSPORT-C1-D4 | — | — | — |
| M | Fuel pump relay | — | W23 | — | 0.5 | MAXXECUSPORT-C1-A1 | — | — | — |
| N | VTCS solenoid (intake butterflies) | — | — | — | — | — | — | — | — |
| P | ISC valve +14V feed | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| Q | ISC valve low side | — | W27 | — | 0.5 | MAXXECUSPORT-C1-M3 | — | — | — |
| R | Malfunction indicator lamp (MIL) | — | — | — | — | — | — | — | — |
OEM-3
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Power ground | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| B | Power ground | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| D | EGR boost solenoid | — | — | — | — | — | — | — | — |
| E | Charcoal canister purge | — | — | — | — | — | — | — | — |
| F | Ignition 1 (coils 1+4, wasted spark) | — | W14 | — | 0.5 | MAXXECUSPORT-C1-A2 | — | — | — |
| H | Main relay | — | W24 | — | 0.5 | MAXXECUSPORT-C1-B1 | — | — | — |
| I | Ignition 2 (coils 2+3, wasted spark) | — | W15 | — | 0.5 | MAXXECUSPORT-C1-A3 | — | — | — |
| J | Front O2 heater | — | W25 | — | 0.5 | MAXXECUSPORT-C1-D1 | — | — | — |
| M | Alternator control | — | — | — | — | — | — | — | — |
| O | Tachometer output | — | — | — | — | — | — | — | — |
| P | Rear O2 heater | — | W26 | — | 0.5 | MAXXECUSPORT-C1-A4 | — | — | — |
| S | Immobiliser | — | W39 | — | 0.5 | MAXXECUSPORT-C1-K4 | — | — | — |
| T | Vehicle speed | — | W38 | — | 0.5 | MAXXECUSPORT-C1-K3 | — | — | — |
| U | Charge lamp | — | — | — | — | — | — | — | — |
| V | Cam position (CMP) | — | W13 | — | 0.5 | MAXXECUSPORT-C1-H4 | — | — | — |
| Y | Crank position (CKP) | — | W12 | — | 0.5 | MAXXECUSPORT-C1-H3 | — | — | — |
OEM-4
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Power ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| AA | Rear O2 signal | — | W33 | — | 0.5 | MAXXECUSPORT-C1-J4 | — | — | — |
| AD | Fuel level | — | W37 | — | 0.5 | MAXXECUSPORT-C1-D2 | — | — | — |
| AF | ECU power +14V (main relay) | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| AG | Constant +12V | — | — | — | — | — | — | — | — |
| B | Brake switch | — | W40 | — | 0.5 | MAXXECUSPORT-C1-D3 | — | — | — |
| C | Power steering pressure switch | — | W41 | — | 0.5 | MAXXECUSPORT-C1-E4 | — | — | — |
| D | VVT oil-control solenoid | — | — | — | — | — | — | — | — |
| F | A/C request | — | — | — | — | — | — | — | — |
| H | Neutral switch | — | — | — | — | — | — | — | — |
| I | Clutch switch | — | — | — | — | — | — | — | — |
| J | VTCS vacuum switch | — | — | — | — | — | — | — | — |
| L | +5V sensor supply | — | W11 | — | 0.5 | MAXXECUSPORT-C1-G1 | — | — | — |
| M | Knock sensor | — | — | — | — | — | — | — | — |
| N | Intake air temperature (IAT) | — | W36 | — | 0.5 | MAXXECUSPORT-C1-J2 | — | — | — |
| O | Signal ground | — | W8 | — | 0.5 | SP-0V-1 | — | — | — |
| P | Coolant temperature (ECT) | — | W35 | — | 0.5 | MAXXECUSPORT-C1-J1 | — | — | — |
| V | Throttle position (TPS) | — | W32 | — | 0.5 | MAXXECUSPORT-C1-G2 | — | — | — |
| W | Front O2 signal | — | W34 | — | 0.5 | MAXXECUSPORT-C1-C1 | — | — | — |
| X | Mass air flow (MAF) | — | W31 | — | 0.5 | MAXXECUSPORT-C1-J3 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W8 | — | 0.5 | OEM-4-O | — | — | — |
| 1 | — | — | W9 | — | 0.5 | MAXXECUSPORT-C1-H1 | — | — | — |
| 1 | — | — | W10 | — | 0.5 | MAXXECUSPORT-C1-H2 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-2-P | — | — | — |
| 1 | — | — | W2 | — | 0.85 | OEM-4-AF | — | — | — |
| 1 | — | — | W3 | — | 0.85 | MAXXECUSPORT-C1-M4 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W4 | — | 0.85 | OEM-3-A | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-3-B | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-4-A | — | — | — |
| 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-2-A | Injector 1 | injector_out | MAXXECUSPORT-C1-K1 | INJ 1 | injector_out | single_source | |
| OEM-2-B | Cooling fan relay | low_side_out | MAXXECUSPORT-C1-B4 | GPO 1 | low_side_out | single_source | |
| OEM-2-C | Condenser fan relay | low_side_out | MAXXECUSPORT-C1-C4 | GPO 2 | low_side_out | single_source | |
| OEM-2-D | Injector 2 | injector_out | MAXXECUSPORT-C1-K2 | INJ 2 | injector_out | single_source | |
| OEM-2-E | EGR valve | low_side_out | MAXXECUSPORT-C1-L3 | INJ 6 | injector_out | single_source | |
| OEM-2-F | EGR valve | low_side_out | MAXXECUSPORT-C1-L1 | GPO 11/Motor 1- | hbridge_out | single_source | |
| OEM-2-G | Injector 3 | injector_out | MAXXECUSPORT-C1-M1 | INJ 3 | injector_out | single_source | |
| OEM-2-H | EGR valve | low_side_out | MAXXECUSPORT-C1-L2 | GPO 12/MOTOR 1+ | hbridge_out | single_source | |
| OEM-2-I | EGR valve | low_side_out | — | — | — | single_source | |
| OEM-2-J | Injector 4 | injector_out | MAXXECUSPORT-C1-M2 | INJ 4 | injector_out | single_source | |
| OEM-2-K | A/C clutch relay | low_side_out | MAXXECUSPORT-C1-D4 | GPO 3 | low_side_out | single_source | |
| OEM-2-M | Fuel pump relay | low_side_out | MAXXECUSPORT-C1-A1 | GPO 4 | low_side_out | single_source | |
| OEM-2-N | VTCS solenoid (intake butterflies) | low_side_out | — | — | — | single_source | |
| OEM-2-P | ISC valve +14V feed | power_in | MAXXECUSPORT-C1-M4 | +12V ECU power supply | power_in | single_source | |
| OEM-2-Q | ISC valve low side | low_side_out | MAXXECUSPORT-C1-M3 | INJ 5 | injector_out | single_source | |
| OEM-2-R | Malfunction indicator lamp (MIL) | low_side_out | — | — | — | single_source | |
| OEM-3-A | Power ground | ground | MAXXECUSPORT-C1-L4 | Engine GND | ground | single_source | |
| OEM-3-B | Power ground | ground | MAXXECUSPORT-C1-L4 | Engine GND | ground | single_source | |
| OEM-3-D | EGR boost solenoid | low_side_out | — | — | — | single_source | |
| OEM-3-E | Charcoal canister purge | low_side_out | — | — | — | single_source | |
| OEM-3-F | Ignition 1 (coils 1+4, wasted spark) | ignition_out | MAXXECUSPORT-C1-A2 | IGN 1 | ignition_out | single_source | |
| OEM-3-H | Main relay | low_side_out | MAXXECUSPORT-C1-B1 | GPO 5 | low_side_out | single_source | |
| OEM-3-I | Ignition 2 (coils 2+3, wasted spark) | ignition_out | MAXXECUSPORT-C1-A3 | IGN 2 | ignition_out | single_source | |
| OEM-3-J | Front O2 heater | low_side_out | MAXXECUSPORT-C1-D1 | WBO2 Heater- | low_side_out | single_source | |
| OEM-3-M | Alternator control | low_side_out | — | — | — | single_source | |
| OEM-3-O | Tachometer output | tacho_out | — | — | — | single_source | |
| OEM-3-P | Rear O2 heater | low_side_out | MAXXECUSPORT-C1-A4 | GPO 8/TACHO | low_side_out | single_source | |
| OEM-3-S | Immobiliser | digital_in | MAXXECUSPORT-C1-K4 | DIN 2 | digital_in | single_source | |
| OEM-3-T | Vehicle speed | digital_in | MAXXECUSPORT-C1-K3 | DIN 1 | digital_in | single_source | |
| OEM-3-U | Charge lamp | low_side_out | — | — | — | single_source | |
| OEM-3-V | Cam position (CMP) | trigger_in | MAXXECUSPORT-C1-H4 | HOME | trigger_in | single_source | |
| OEM-3-Y | Crank position (CKP) | trigger_in | MAXXECUSPORT-C1-H3 | TRIGGER | trigger_in | single_source | |
| OEM-4-A | Power ground | ground | MAXXECUSPORT-C1-L4 | Engine GND | ground | single_source | |
| OEM-4-AA | Rear O2 signal | lambda_nb_in | MAXXECUSPORT-C1-J4 | AIN 4 (0-5V) | analog_in | single_source | |
| OEM-4-AD | Fuel level | analog_in | MAXXECUSPORT-C1-D2 | AIN 6 (0-5V) | analog_in | single_source | |
| OEM-4-AF | ECU power +14V (main relay) | power_in | MAXXECUSPORT-C1-M4 | +12V ECU power supply | power_in | single_source | |
| OEM-4-AG | Constant +12V | power_in | — | — | — | single_source | |
| OEM-4-B | Brake switch | digital_in | MAXXECUSPORT-C1-D3 | AIN 7 (0-5V) | analog_in | single_source | |
| OEM-4-C | Power steering pressure switch | digital_in | MAXXECUSPORT-C1-E4 | AIN 8 (0-5V) | analog_in | single_source | |
| OEM-4-D | VVT oil-control solenoid | low_side_out | — | — | — | single_source | |
| OEM-4-F | A/C request | digital_in | — | — | — | single_source | |
| OEM-4-H | Neutral switch | digital_in | — | — | — | single_source | |
| OEM-4-I | Clutch switch | digital_in | — | — | — | single_source | |
| OEM-4-J | VTCS vacuum switch | digital_in | — | — | — | single_source | |
| OEM-4-L | +5V sensor supply | vref | MAXXECUSPORT-C1-G1 | +5V sensor supply | vref | single_source | |
| OEM-4-M | Knock sensor | knock_in | — | — | — | single_source | |
| OEM-4-N | Intake air temperature (IAT) | temp_in | MAXXECUSPORT-C1-J2 | AIN 2 (Temperature) | temp_in | single_source | |
| OEM-4-O | Signal ground | sensor_ground | MAXXECUSPORT-C1-H1 + MAXXECUSPORT-C1-H2 | Sensor GND + Trigger GND | sensor_ground | single_source | |
| OEM-4-P | Coolant temperature (ECT) | temp_in | MAXXECUSPORT-C1-J1 | AIN 1 (temperature) | temp_in | single_source | |
| OEM-4-V | Throttle position (TPS) | analog_in | MAXXECUSPORT-C1-G2 | TPS/AIN | analog_in | single_source | |
| OEM-4-W | Front O2 signal | lambda_nb_in | MAXXECUSPORT-C1-C1 | AIN 5 (0-5V) | analog_in | single_source | |
| OEM-4-X | Mass air flow (MAF) | analog_in | MAXXECUSPORT-C1-J3 | AIN 3 (0-5V) | analog_in | single_source |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-2-P | SP-14V-1 | 0.85 | no route | ISC valve +14V feed | — | |
| W2 | OEM-4-AF | SP-14V-1 | 0.85 | no route | ECU power +14V (main relay) | — | |
| W3 | SP-14V-1 | MAXXECUSPORT-C1-M4 | 0.85 | no route | +12V ECU power supply | — | |
| W4 | OEM-3-A | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W5 | OEM-3-B | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W6 | OEM-4-A | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W7 | SP-GND-1 | MAXXECUSPORT-C1-L4 | 0.85 | no route | Engine GND | — | |
| W8 | OEM-4-O | SP-0V-1 | 0.5 | no route | Signal ground | — | |
| W9 | SP-0V-1 | MAXXECUSPORT-C1-H1 | 0.5 | no route | Sensor GND | — | |
| W10 | SP-0V-1 | MAXXECUSPORT-C1-H2 | 0.5 | no route | Trigger GND | — | |
| W11 | OEM-4-L | MAXXECUSPORT-C1-G1 | 0.5 | no route | +5V sensor supply | — | |
| W12 | OEM-3-Y | MAXXECUSPORT-C1-H3 | 0.5 | no route | Crank position (CKP) | — | |
| W13 | OEM-3-V | MAXXECUSPORT-C1-H4 | 0.5 | no route | Cam position (CMP) | — | |
| W14 | OEM-3-F | MAXXECUSPORT-C1-A2 | 0.5 | no route | Ignition 1 (coils 1+4, wasted spark) | — | |
| W15 | OEM-3-I | MAXXECUSPORT-C1-A3 | 0.5 | no route | Ignition 2 (coils 2+3, wasted spark) | — | |
| W16 | OEM-2-A | MAXXECUSPORT-C1-K1 | 0.5 | no route | Injector 1 | — | |
| W17 | OEM-2-D | MAXXECUSPORT-C1-K2 | 0.5 | no route | Injector 2 | — | |
| W18 | OEM-2-G | MAXXECUSPORT-C1-M1 | 0.5 | no route | Injector 3 | — | |
| W19 | OEM-2-J | MAXXECUSPORT-C1-M2 | 0.5 | no route | Injector 4 | — | |
| W20 | OEM-2-B | MAXXECUSPORT-C1-B4 | 0.5 | no route | Cooling fan relay | — | |
| W21 | OEM-2-C | MAXXECUSPORT-C1-C4 | 0.5 | no route | Condenser fan relay | — | |
| W22 | OEM-2-K | MAXXECUSPORT-C1-D4 | 0.5 | no route | A/C clutch relay | — | |
| W23 | OEM-2-M | MAXXECUSPORT-C1-A1 | 0.5 | no route | Fuel pump relay | — | |
| W24 | OEM-3-H | MAXXECUSPORT-C1-B1 | 0.5 | no route | Main relay | — | |
| W25 | OEM-3-J | MAXXECUSPORT-C1-D1 | 0.5 | no route | Front O2 heater | — | |
| W26 | OEM-3-P | MAXXECUSPORT-C1-A4 | 0.5 | no route | Rear O2 heater | — | |
| W27 | OEM-2-Q | MAXXECUSPORT-C1-M3 | 0.5 | no route | ISC valve low side | — | |
| W28 | OEM-2-E | MAXXECUSPORT-C1-L3 | 0.5 | no route | EGR valve | — | |
| W29 | OEM-2-F | MAXXECUSPORT-C1-L1 | 0.5 | no route | EGR valve | — | |
| W30 | OEM-2-H | MAXXECUSPORT-C1-L2 | 0.5 | no route | EGR valve | — | |
| W31 | OEM-4-X | MAXXECUSPORT-C1-J3 | 0.5 | no route | Mass air flow (MAF) | — | |
| W32 | OEM-4-V | MAXXECUSPORT-C1-G2 | 0.5 | no route | Throttle position (TPS) | — | |
| W33 | OEM-4-AA | MAXXECUSPORT-C1-J4 | 0.5 | no route | Rear O2 signal | — | |
| W34 | OEM-4-W | MAXXECUSPORT-C1-C1 | 0.5 | no route | Front O2 signal | — | |
| W35 | OEM-4-P | MAXXECUSPORT-C1-J1 | 0.5 | no route | Coolant temperature (ECT) | — | |
| W36 | OEM-4-N | MAXXECUSPORT-C1-J2 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W37 | OEM-4-AD | MAXXECUSPORT-C1-D2 | 0.5 | no route | Fuel level | — | |
| W38 | OEM-3-T | MAXXECUSPORT-C1-K3 | 0.5 | no route | Vehicle speed | — | |
| W39 | OEM-3-S | MAXXECUSPORT-C1-K4 | 0.5 | no route | Immobiliser | — | |
| W40 | OEM-4-B | MAXXECUSPORT-C1-D3 | 0.5 | no route | Brake switch | — | |
| W41 | OEM-4-C | MAXXECUSPORT-C1-E4 | 0.5 | no route | Power steering pressure 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 (12)
| Severity | Code | Subject | Message |
|---|---|---|---|
| warn | LOAD_UNKNOWN | MAXXECUSPORT-C1-A1 | MAXXECUSPORT-C1-A1 "GPO 4" drives OEM-2-M Fuel pump relay (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | MAXXECUSPORT-C1-B1 | MAXXECUSPORT-C1-B1 "GPO 5" drives OEM-3-H Main relay (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-2-B Cooling fan relay (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-2-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-2-K A/C clutch relay (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | NET_FAMILY | OEM-2-F ↔ MAXXECUSPORT-C1-L1 | OEM-2-F "EGR valve" [low_side_out] is wired to MAXXECUSPORT-C1-L1 "GPO 11/Motor 1-" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way. |
| warn | NET_FAMILY | OEM-2-H ↔ MAXXECUSPORT-C1-L2 | OEM-2-H "EGR valve" [low_side_out] is wired to MAXXECUSPORT-C1-L2 "GPO 12/MOTOR 1+" [hbridge_out]. A half-bridge can act as a low-side switch only if configured that way. |
| warn | NET_FAMILY | OEM-4-B ↔ MAXXECUSPORT-C1-D3 | OEM-4-B "Brake switch" [digital_in] is wired to MAXXECUSPORT-C1-D3 "AIN 7 (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-4-C ↔ MAXXECUSPORT-C1-E4 | OEM-4-C "Power steering pressure switch" [digital_in] is wired to MAXXECUSPORT-C1-E4 "AIN 8 (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-E ↔ MAXXECUSPORT-C1-L3 | OEM-2-E "EGR valve" [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 | NET_FAMILY | OEM-2-Q ↔ MAXXECUSPORT-C1-M3 | OEM-2-Q "ISC valve low side" [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 | UNMAPPED | OEM | 14 optional OEM pins are not mapped: OEM-2-I EGR valve; OEM-2-N VTCS solenoid (intake butterflies); OEM-2-R Malfunction indicator lamp (MIL); OEM-3-D EGR boost solenoid; OEM-3-E Charcoal canister purge; OEM-3-M Alternator control; OEM-3-O Tachometer output; OEM-3-U Charge lamp; OEM-4-D VVT oil-control solenoid; OEM-4-F A/C request; OEM-4-H Neutral switch; OEM-4-I Clutch switch; OEM-4-J VTCS vacuum switch; OEM-4-M Knock sensor |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-4-AG | 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-4 AG: Constant +12V: MaxxECU MaxxECU SPORT has no battery-constant input; not needed - OEM-4 M: Knock sensor: no free knock input on MaxxECU MaxxECU SPORT - OEM-2 I: EGR valve: no free low_side/ls_hs/injector/hbridge on MaxxECU MaxxECU SPORT - OEM-2 N: VTCS solenoid (intake butterflies): no free low_side/ls_hs/injector/hbridge on MaxxECU MaxxECU SPORT - OEM-2 R: Malfunction indicator lamp (MIL): no free low_side/ls_hs/injector/hbridge on MaxxECU MaxxECU SPORT - OEM-3 D: EGR boost solenoid: no free low_side/ls_hs/injector/hbridge on MaxxECU MaxxECU SPORT - OEM-3 E: Charcoal canister purge: no free low_side/ls_hs/injector/hbridge on MaxxECU MaxxECU SPORT - OEM-3 M: Alternator control: no free low_side/ls_hs/injector/hbridge on MaxxECU MaxxECU SPORT - OEM-3 U: Charge lamp: no free low_side/ls_hs/injector/hbridge on MaxxECU MaxxECU SPORT - OEM-4 D: VVT oil-control solenoid: no free low_side/ls_hs/injector/hbridge on MaxxECU MaxxECU SPORT - OEM-3 O: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on MaxxECU MaxxECU SPORT - OEM-4 F: A/C request: no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU SPORT - OEM-4 H: Neutral switch: no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU SPORT - OEM-4 I: Clutch switch: no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU SPORT - OEM-4 J: VTCS vacuum 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 | Link G4X MX5NB2X install manual (NB2 2001-05) | https://linkecu.com/documentation/MX5XNB2.pdf | archive | 2026-10-05 | 741efdd9f2c8 |
| 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 |