MX-5 Miata Mazdaspeed 2004-05 (BP-ZET turbo, no VVT) → MaxxECU MaxxECU STREET REV9+ (auto)
MX-5 Miata Mazdaspeed 2004-05 (BP-ZET turbo, no VVT) — MaxxECU — MaxxECU STREET
Drawn by Michael Gnankou · Rev 0 · proposal · 2026-10-17
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 | proposal · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | none |
| Size of the job | 37 wires · 8 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 | MAXXECUSTREE-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 | MAXXECUSTREE-C1-L4 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | OEM-4-O | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-0V-1 | MAXXECUSTREE-C1-H1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-0V-1 | MAXXECUSTREE-C1-H2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-4-L | MAXXECUSTREE-C1-G1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-3-Y | MAXXECUSTREE-C1-H3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-3-V | MAXXECUSTREE-C1-H4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-3-F | MAXXECUSTREE-C1-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-3-I | MAXXECUSTREE-C1-A3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-2-A | MAXXECUSTREE-C1-K1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-2-D | MAXXECUSTREE-C1-K2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-2-G | MAXXECUSTREE-C1-M1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-2-J | MAXXECUSTREE-C1-M2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-4-X | MAXXECUSTREE-C1-J3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-4-V | MAXXECUSTREE-C1-G2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-4-P | MAXXECUSTREE-C1-F1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-2-B | MAXXECUSTREE-C1-B4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-2-C | MAXXECUSTREE-C1-C4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-2-K | MAXXECUSTREE-C1-D4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-2-M | MAXXECUSTREE-C1-A4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-3-H | MAXXECUSTREE-C1-D1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-2-O | MAXXECUSTREE-C1-M3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-4-D | RLY1-R-OUT | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | SP-14V-1 | RLY1-R-IN | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | SP-14V-1 | RLY1-R-COIL+ | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | RLY1-R-COIL- | MAXXECUSTREE-C1-L3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-4-AE | MAXXECUSTREE-C1-J4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-4-R | MAXXECUSTREE-C1-F2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-4-N | MAXXECUSTREE-C1-J1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-3-T | MAXXECUSTREE-C1-K3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-3-S | MAXXECUSTREE-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 | MAXXECUSTREE-C1-G1 | MAXXECUSTREE-C1-H1 | open (OL) | 5 V sensor reference must not touch sensor ground | |
| 2 | MAXXECUSTREE-C1-M4 | MAXXECUSTREE-C1-H1 | open (OL) | +12 V supply must not touch sensor ground | |
| 3 | MAXXECUSTREE-C1-M4 | MAXXECUSTREE-C1-L4 | open (OL) | +12 V supply must not touch power ground | |
| 4 | RLY1-R-OUT | MAXXECUSTREE-C1-H1 | open (OL) | +12 V supply must not touch sensor ground | |
| 5 | MAXXECUSTREE-C1-L4 | MAXXECUSTREE-C1-G1 | open (OL) | power ground must not touch 5 V sensor reference | |
| 6 | MAXXECUSTREE-C1-L4 | RLY1-R-OUT | open (OL) | power ground must not touch +12 V supply | |
| 7 | MAXXECUSTREE-C1-M4 | MAXXECUSTREE-C1-G1 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 8 | RLY1-R-OUT | MAXXECUSTREE-C1-G1 | open (OL) | +12 V supply must not touch 5 V sensor reference |
If any reading doesn't match, stop and get help before powering up.
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
MAXXECUSTREE-C1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 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-2-M | — | — | — |
| B2 | IGN 3 | — | — | — | — | — | — | — | — |
| B3 | IGN 4 | — | — | — | — | — | — | — | — |
| B4 | GPO 1 | — | W23 | — | 0.5 | OEM-2-B | — | — | — |
| C2 | IGN 5 | — | — | — | — | — | — | — | — |
| C3 | IGN 6 | — | — | — | — | — | — | — | — |
| C4 | GPO 2 | — | W24 | — | 0.5 | OEM-2-C | — | — | — |
| D1 | WBO2 Heater- | — | W27 | — | 0.5 | OEM-3-H | — | — | — |
| D4 | GPO 3 | — | W25 | — | 0.5 | OEM-2-K | — | — | — |
| E1 | CAN H | — | — | — | — | — | — | — | — |
| E2 | CAN L | — | — | — | — | — | — | — | — |
| E3 | GND Shield | — | — | — | — | — | — | — | — |
| F1 | CLT | — | W22 | — | 0.5 | OEM-4-P | — | — | — |
| F2 | IAT | — | W34 | — | 0.5 | OEM-4-R | — | — | — |
| F3 | WBO2 VREF | — | — | — | — | — | — | — | — |
| F4 | WBO2 VS | — | — | — | — | — | — | — | — |
| G1 | +5V sensor supply | — | W11 | — | 0.5 | OEM-4-L | — | — | — |
| G2 | TPS/AIN | — | W21 | — | 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-N | — | — | — |
| J2 | AIN 2 (Temperature) | — | — | — | — | — | — | — | — |
| J3 | AIN 3 (0-5V) | — | W20 | — | 0.5 | OEM-4-X | — | — | — |
| J4 | AIN 4 (0-5V) | — | W33 | — | 0.5 | OEM-4-AE | — | — | — |
| K1 | INJ 1 | — | W16 | — | 0.5 | OEM-2-A | — | — | — |
| K2 | INJ 2 | — | W17 | — | 0.5 | OEM-2-D | — | — | — |
| K3 | DIN 1 | — | W36 | — | 0.5 | OEM-3-T | — | — | — |
| K4 | DIN 2 | — | W37 | — | 0.5 | OEM-3-S | — | — | — |
| L3 | INJ 6 | — | W32 | — | 0.5 | RLY1-R-COIL- | — | — | — |
| 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 | — | W28 | — | 0.5 | OEM-2-O | — | — | — |
| 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 | MAXXECUSTREE-C1-K1 | — | — | — |
| B | Cooling fan relay | — | W23 | — | 0.5 | MAXXECUSTREE-C1-B4 | — | — | — |
| C | Condenser fan relay | — | W24 | — | 0.5 | MAXXECUSTREE-C1-C4 | — | — | — |
| D | Injector 2 | — | W17 | — | 0.5 | MAXXECUSTREE-C1-K2 | — | — | — |
| E | EGR valve | — | — | — | — | — | — | — | — |
| F | EGR valve | — | — | — | — | — | — | — | — |
| G | Injector 3 | — | W18 | — | 0.5 | MAXXECUSTREE-C1-M1 | — | — | — |
| H | EGR valve | — | — | — | — | — | — | — | — |
| I | EGR valve | — | — | — | — | — | — | — | — |
| J | Injector 4 | — | W19 | — | 0.5 | MAXXECUSTREE-C1-M2 | — | — | — |
| K | A/C clutch relay | — | W25 | — | 0.5 | MAXXECUSTREE-C1-D4 | — | — | — |
| L | NC | — | — | — | — | — | — | — | — |
| M | Fuel pump relay | — | W26 | — | 0.5 | MAXXECUSTREE-C1-A4 | — | — | — |
| N | VTCS solenoid (intake butterflies) | — | — | — | — | — | — | — | — |
| O | Fuel pump relay (non-immobiliser) | — | W28 | — | 0.5 | MAXXECUSTREE-C1-M3 | — | — | — |
| P | ISC valve +14V feed | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| Q | ISC valve low side | — | — | — | — | — | — | — | — |
| 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 | — | — | — |
| C | Purge solenoid valve | — | — | — | — | — | — | — | — |
| D | EGR boost solenoid | — | — | — | — | — | — | — | — |
| E | NC | — | — | — | — | — | — | — | — |
| F | Ignition 1 (coils 1+4, wasted spark) | — | W14 | — | 0.5 | MAXXECUSTREE-C1-A2 | — | — | — |
| G | NC | — | — | — | — | — | — | — | — |
| H | Main relay | — | W27 | — | 0.5 | MAXXECUSTREE-C1-D1 | — | — | — |
| I | Ignition 2 (coils 2+3, wasted spark) | — | W15 | — | 0.5 | MAXXECUSTREE-C1-A3 | — | — | — |
| J | Front O2 heater | — | — | — | — | — | — | — | — |
| K | EVAP leak detection pump | — | — | — | — | — | — | — | — |
| L | NC | — | — | — | — | — | — | — | — |
| M | Alternator control | — | — | — | — | — | — | — | — |
| N | NC | — | — | — | — | — | — | — | — |
| O | Tachometer output | — | — | — | — | — | — | — | — |
| P | Rear O2 heater | — | — | — | — | — | — | — | — |
| Q | Data link connector (K-line) | — | — | — | — | — | — | — | — |
| R | NC | — | — | — | — | — | — | — | — |
| S | Immobiliser | — | W37 | — | 0.5 | MAXXECUSTREE-C1-K4 | — | — | — |
| T | Vehicle speed | — | W36 | — | 0.5 | MAXXECUSTREE-C1-K3 | — | — | — |
| U | Charge lamp | — | — | — | — | — | — | — | — |
| V | Cam position (CMP) | — | W13 | — | 0.5 | MAXXECUSTREE-C1-H4 | — | — | — |
| W | NC | — | — | — | — | — | — | — | — |
| X | NC | — | — | — | — | — | — | — | — |
| Y | Crank position (CKP) | — | W12 | — | 0.5 | MAXXECUSTREE-C1-H3 | — | — | — |
| Z | NC | — | — | — | — | — | — | — | — |
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 | — | — | — | — | — | — | — | — |
| AB | NC | — | — | — | — | — | — | — | — |
| AC | Data link connector (DLC TEN, turbo) | — | — | — | — | — | — | — | — |
| AD | Fuel level | — | — | — | — | — | — | — | — |
| AE | BARO/MAP sensor (turbo boost pressure) | — | W33 | — | 0.5 | MAXXECUSTREE-C1-J4 | — | — | — |
| AF | ECU power +14V (main relay) | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| AG | Constant +12V | — | — | — | — | — | — | — | — |
| AH | EVAP leak detection pump solenoid valve | — | — | — | — | — | — | — | — |
| B | Brake switch | — | — | — | — | — | — | — | — |
| C | Power steering pressure switch | — | — | — | — | — | — | — | — |
| D | Boost control solenoid (turbo) | — | W29 | — | 0.5 | RLY1-R-OUT | — | — | — |
| E | Boost control solenoid (turbo) | — | — | — | — | — | — | — | — |
| F | A/C request | — | — | — | — | — | — | — | — |
| G | NC | — | — | — | — | — | — | — | — |
| H | Neutral switch | — | — | — | — | — | — | — | — |
| I | Clutch switch | — | — | — | — | — | — | — | — |
| J | VTCS vacuum switch | — | — | — | — | — | — | — | — |
| K | NC | — | — | — | — | — | — | — | — |
| L | +5V sensor supply | — | W11 | — | 0.5 | MAXXECUSTREE-C1-G1 | — | — | — |
| M | Knock sensor | — | — | — | — | — | — | — | — |
| N | Intake air temperature (IAT) | — | W35 | — | 0.5 | MAXXECUSTREE-C1-J1 | — | — | — |
| O | Signal ground | — | W8 | — | 0.5 | SP-0V-1 | — | — | — |
| P | Coolant temperature (ECT) | — | W22 | — | 0.5 | MAXXECUSTREE-C1-F1 | — | — | — |
| Q | NC | — | — | — | — | — | — | — | — |
| R | Intake air temperature 2 (IAT2, turbo) | — | W34 | — | 0.5 | MAXXECUSTREE-C1-F2 | — | — | — |
| S | Ignition switch (IG1) sense | — | — | — | — | — | — | — | — |
| T | Generator output voltage (terminal P) | — | — | — | — | — | — | — | — |
| U | NC | — | — | — | — | — | — | — | — |
| V | Throttle position (TPS) | — | W21 | — | 0.5 | MAXXECUSTREE-C1-G2 | — | — | — |
| W | Front O2 signal | — | — | — | — | — | — | — | — |
| X | Mass air flow (MAF) | — | W20 | — | 0.5 | MAXXECUSTREE-C1-J3 | — | — | — |
| Y | NC | — | — | — | — | — | — | — | — |
| Z | TCM (automatic only) | — | — | — | — | — | — | — | — |
RLY1-R
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| COIL+ | Relay coil positive (switched +12 V) | — | W31 | — | 0.5 | SP-14V-1 | — | — | — |
| COIL- | Relay coil negative (ECU low-side driver) | — | W32 | — | 0.5 | MAXXECUSTREE-C1-L3 | — | — | — |
| IN | Relay contact input (switched +12 V) | — | W30 | — | 0.5 | SP-14V-1 | — | — | — |
| OUT | Relay contact output (switched +12 V to load) | — | W29 | — | 0.5 | OEM-4-D | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W8 | — | 0.5 | OEM-4-O | — | — | — |
| 1 | — | — | W9 | — | 0.5 | MAXXECUSTREE-C1-H1 | — | — | — |
| 1 | — | — | W10 | — | 0.5 | MAXXECUSTREE-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 | MAXXECUSTREE-C1-M4 | — | — | — |
| 1 | — | — | W30 | — | 0.5 | RLY1-R-IN | — | — | — |
| 1 | — | — | W31 | — | 0.5 | RLY1-R-COIL+ | — | — | — |
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 | MAXXECUSTREE-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 | MAXXECUSTREE-C1-K1 | INJ 1 | injector_out | corroborated | |
| OEM-2-B | Cooling fan relay | low_side_out | MAXXECUSTREE-C1-B4 | GPO 1 | low_side_out | corroborated | |
| OEM-2-C | Condenser fan relay | low_side_out | MAXXECUSTREE-C1-C4 | GPO 2 | low_side_out | corroborated | |
| OEM-2-D | Injector 2 | injector_out | MAXXECUSTREE-C1-K2 | INJ 2 | injector_out | corroborated | |
| OEM-2-E | EGR valve | low_side_out | — | — | — | corroborated | |
| OEM-2-F | EGR valve | low_side_out | — | — | — | corroborated | |
| OEM-2-G | Injector 3 | injector_out | MAXXECUSTREE-C1-M1 | INJ 3 | injector_out | corroborated | |
| OEM-2-H | EGR valve | low_side_out | — | — | — | corroborated | |
| OEM-2-I | EGR valve | low_side_out | — | — | — | corroborated | |
| OEM-2-J | Injector 4 | injector_out | MAXXECUSTREE-C1-M2 | INJ 4 | injector_out | corroborated | |
| OEM-2-K | A/C clutch relay | low_side_out | MAXXECUSTREE-C1-D4 | GPO 3 | low_side_out | corroborated | |
| OEM-2-L | NC | — | — | — | — | single_source | |
| OEM-2-M | Fuel pump relay | low_side_out | MAXXECUSTREE-C1-A4 | GPO 8/TACHO | low_side_out | corroborated | |
| OEM-2-N | VTCS solenoid (intake butterflies) | low_side_out | — | — | — | corroborated | |
| OEM-2-O | Fuel pump relay (non-immobiliser) | low_side_out | MAXXECUSTREE-C1-M3 | INJ 5 | injector_out | corroborated | |
| OEM-2-P | ISC valve +14V feed | power_in | MAXXECUSTREE-C1-M4 + RLY1-R-COIL+ + RLY1-R-IN | +12V ECU power supply + Relay coil positive (switched +12 V) + Relay contact input (switched +12 V) | power_in + power_out | corroborated | |
| OEM-2-Q | ISC valve low side | low_side_out | — | — | — | corroborated | |
| OEM-2-R | Malfunction indicator lamp (MIL) | low_side_out | — | — | — | corroborated | |
| OEM-3-A | Power ground | ground | MAXXECUSTREE-C1-L4 | Engine GND | ground | corroborated | |
| OEM-3-B | Power ground | ground | MAXXECUSTREE-C1-L4 | Engine GND | ground | corroborated | |
| OEM-3-C | Purge solenoid valve | low_side_out | — | — | — | corroborated | |
| OEM-3-D | EGR boost solenoid | — | — | — | — | conflict | |
| OEM-3-E | NC | — | — | — | — | single_source | |
| OEM-3-F | Ignition 1 (coils 1+4, wasted spark) | ignition_out | MAXXECUSTREE-C1-A2 | IGN 1 | ignition_out | corroborated | |
| OEM-3-G | NC | — | — | — | — | single_source | |
| OEM-3-H | Main relay | low_side_out | MAXXECUSTREE-C1-D1 | WBO2 Heater- | low_side_out | corroborated | |
| OEM-3-I | Ignition 2 (coils 2+3, wasted spark) | ignition_out | MAXXECUSTREE-C1-A3 | IGN 2 | ignition_out | corroborated | |
| OEM-3-J | Front O2 heater | low_side_out | — | — | — | corroborated | |
| OEM-3-K | EVAP leak detection pump | low_side_out | — | — | — | corroborated | |
| OEM-3-L | NC | — | — | — | — | single_source | |
| OEM-3-M | Alternator control | low_side_out | — | — | — | corroborated | |
| OEM-3-N | NC | — | — | — | — | single_source | |
| OEM-3-O | Tachometer output | tacho_out | — | — | — | corroborated | |
| OEM-3-P | Rear O2 heater | low_side_out | — | — | — | corroborated | |
| OEM-3-Q | Data link connector (K-line) | serial | — | — | — | corroborated | |
| OEM-3-R | NC | — | — | — | — | single_source | |
| OEM-3-S | Immobiliser | digital_in | MAXXECUSTREE-C1-K4 | DIN 2 | digital_in | corroborated | |
| OEM-3-T | Vehicle speed | digital_in | MAXXECUSTREE-C1-K3 | DIN 1 | digital_in | corroborated | |
| OEM-3-U | Charge lamp | low_side_out | — | — | — | corroborated | |
| OEM-3-V | Cam position (CMP) | trigger_in | MAXXECUSTREE-C1-H4 | HOME | trigger_in | corroborated | |
| OEM-3-W | NC | — | — | — | — | single_source | |
| OEM-3-X | NC | — | — | — | — | single_source | |
| OEM-3-Y | Crank position (CKP) | trigger_in | MAXXECUSTREE-C1-H3 | TRIGGER | trigger_in | corroborated | |
| OEM-3-Z | NC | — | — | — | — | single_source | |
| OEM-4-A | Power ground | ground | MAXXECUSTREE-C1-L4 | Engine GND | ground | corroborated | |
| OEM-4-AA | Rear O2 signal | lambda_nb_in | — | — | — | corroborated | |
| OEM-4-AB | NC | — | — | — | — | single_source | |
| OEM-4-AC | Data link connector (DLC TEN, turbo) | serial | — | — | — | BrY | single_source |
| OEM-4-AD | Fuel level | analog_in | — | — | — | corroborated | |
| OEM-4-AE | BARO/MAP sensor (turbo boost pressure) | analog_in | MAXXECUSTREE-C1-J4 | AIN 4 (0-5V) | analog_in | LY | single_source |
| OEM-4-AF | ECU power +14V (main relay) | power_in | MAXXECUSTREE-C1-M4 + RLY1-R-COIL+ + RLY1-R-IN | +12V ECU power supply + Relay coil positive (switched +12 V) + Relay contact input (switched +12 V) | power_in + power_out | corroborated | |
| OEM-4-AG | Constant +12V | power_in | — | — | — | corroborated | |
| OEM-4-AH | EVAP leak detection pump solenoid valve | low_side_out | — | — | — | corroborated | |
| OEM-4-B | Brake switch | digital_in | — | — | — | corroborated | |
| OEM-4-C | Power steering pressure switch | digital_in | — | — | — | corroborated | |
| OEM-4-D | Boost control solenoid (turbo) | high_side_out | RLY1-R-OUT | Relay contact output (switched +12 V to load) | power_out | Y | single_source |
| OEM-4-E | Boost control solenoid (turbo) | high_side_out | — | — | — | Y | single_source |
| OEM-4-F | A/C request | digital_in | — | — | — | corroborated | |
| OEM-4-G | NC | — | — | — | — | single_source | |
| OEM-4-H | Neutral switch | digital_in | — | — | — | corroborated | |
| OEM-4-I | Clutch switch | digital_in | — | — | — | corroborated | |
| OEM-4-J | VTCS vacuum switch | digital_in | — | — | — | corroborated | |
| OEM-4-K | NC | — | — | — | — | single_source | |
| OEM-4-L | +5V sensor supply | vref | MAXXECUSTREE-C1-G1 | +5V sensor supply | vref | corroborated | |
| OEM-4-M | Knock sensor | knock_in | — | — | — | corroborated | |
| OEM-4-N | Intake air temperature (IAT) | temp_in | MAXXECUSTREE-C1-J1 | AIN 1 (temperature) | temp_in | corroborated | |
| OEM-4-O | Signal ground | sensor_ground | MAXXECUSTREE-C1-H1 + MAXXECUSTREE-C1-H2 | Sensor GND + Trigger GND | sensor_ground | corroborated | |
| OEM-4-P | Coolant temperature (ECT) | temp_in | MAXXECUSTREE-C1-F1 | CLT | temp_in | corroborated | |
| OEM-4-Q | NC | — | — | — | — | single_source | |
| OEM-4-R | Intake air temperature 2 (IAT2, turbo) | temp_in | MAXXECUSTREE-C1-F2 | IAT | temp_in | VY | single_source |
| OEM-4-S | Ignition switch (IG1) sense | digital_in | — | — | — | corroborated | |
| OEM-4-T | Generator output voltage (terminal P) | — | — | — | — | corroborated | |
| OEM-4-U | NC | — | — | — | — | single_source | |
| OEM-4-V | Throttle position (TPS) | analog_in | MAXXECUSTREE-C1-G2 | TPS/AIN | analog_in | corroborated | |
| OEM-4-W | Front O2 signal | lambda_nb_in | — | — | — | corroborated | |
| OEM-4-X | Mass air flow (MAF) | analog_in | MAXXECUSTREE-C1-J3 | AIN 3 (0-5V) | analog_in | corroborated | |
| OEM-4-Y | NC | — | — | — | — | single_source | |
| OEM-4-Z | TCM (automatic only) | — | — | — | — | corroborated |
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 | MAXXECUSTREE-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 | MAXXECUSTREE-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 | MAXXECUSTREE-C1-H1 | 0.5 | no route | Sensor GND | — | |
| W10 | SP-0V-1 | MAXXECUSTREE-C1-H2 | 0.5 | no route | Trigger GND | — | |
| W11 | OEM-4-L | MAXXECUSTREE-C1-G1 | 0.5 | no route | +5V sensor supply | — | |
| W12 | OEM-3-Y | MAXXECUSTREE-C1-H3 | 0.5 | no route | Crank position (CKP) | — | |
| W13 | OEM-3-V | MAXXECUSTREE-C1-H4 | 0.5 | no route | Cam position (CMP) | — | |
| W14 | OEM-3-F | MAXXECUSTREE-C1-A2 | 0.5 | no route | Ignition 1 (coils 1+4, wasted spark) | — | |
| W15 | OEM-3-I | MAXXECUSTREE-C1-A3 | 0.5 | no route | Ignition 2 (coils 2+3, wasted spark) | — | |
| W16 | OEM-2-A | MAXXECUSTREE-C1-K1 | 0.5 | no route | Injector 1 | — | |
| W17 | OEM-2-D | MAXXECUSTREE-C1-K2 | 0.5 | no route | Injector 2 | — | |
| W18 | OEM-2-G | MAXXECUSTREE-C1-M1 | 0.5 | no route | Injector 3 | — | |
| W19 | OEM-2-J | MAXXECUSTREE-C1-M2 | 0.5 | no route | Injector 4 | — | |
| W20 | OEM-4-X | MAXXECUSTREE-C1-J3 | 0.5 | no route | Mass air flow (MAF) | — | |
| W21 | OEM-4-V | MAXXECUSTREE-C1-G2 | 0.5 | no route | Throttle position (TPS) | — | |
| W22 | OEM-4-P | MAXXECUSTREE-C1-F1 | 0.5 | no route | Coolant temperature (ECT) | — | |
| W23 | OEM-2-B | MAXXECUSTREE-C1-B4 | 0.5 | no route | Cooling fan relay | — | |
| W24 | OEM-2-C | MAXXECUSTREE-C1-C4 | 0.5 | no route | Condenser fan relay | — | |
| W25 | OEM-2-K | MAXXECUSTREE-C1-D4 | 0.5 | no route | A/C clutch relay | — | |
| W26 | OEM-2-M | MAXXECUSTREE-C1-A4 | 0.5 | no route | Fuel pump relay | — | |
| W27 | OEM-3-H | MAXXECUSTREE-C1-D1 | 0.5 | no route | Main relay | — | |
| W28 | OEM-2-O | MAXXECUSTREE-C1-M3 | 0.5 | no route | Fuel pump relay (non-immobiliser) | — | |
| W29 | OEM-4-D | RLY1-R-OUT | 0.5 | no route | Boost control solenoid (turbo) | — | |
| W30 | SP-14V-1 | RLY1-R-IN | 0.5 | no route | Relay contact input (switched +12 V) | — | |
| W31 | SP-14V-1 | RLY1-R-COIL+ | 0.5 | no route | Relay coil positive (switched +12 V) | — | |
| W32 | RLY1-R-COIL- | MAXXECUSTREE-C1-L3 | 0.5 | no route | Relay coil negative (ECU low-side driver) | — | |
| W33 | OEM-4-AE | MAXXECUSTREE-C1-J4 | 0.5 | no route | BARO/MAP sensor (turbo boost pressure) | — | |
| W34 | OEM-4-R | MAXXECUSTREE-C1-F2 | 0.5 | no route | Intake air temperature 2 (IAT2, turbo) | — | |
| W35 | OEM-4-N | MAXXECUSTREE-C1-J1 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W36 | OEM-3-T | MAXXECUSTREE-C1-K3 | 0.5 | no route | Vehicle speed | — | |
| W37 | OEM-3-S | MAXXECUSTREE-C1-K4 | 0.5 | no route | Immobiliser | — |
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 |
|---|---|---|---|
| warn | LOAD_UNKNOWN | MAXXECUSTREE-C1-A4 | MAXXECUSTREE-C1-A4 "GPO 8/TACHO" drives OEM-2-M Fuel pump relay (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | MAXXECUSTREE-C1-B4 | MAXXECUSTREE-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 | MAXXECUSTREE-C1-C4 | MAXXECUSTREE-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 | MAXXECUSTREE-C1-D1 | MAXXECUSTREE-C1-D1 "WBO2 Heater-" drives OEM-3-H Main relay (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | MAXXECUSTREE-C1-D4 | MAXXECUSTREE-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. |
| info | NET_FAMILY | OEM-2-O ↔ MAXXECUSTREE-C1-M3 | OEM-2-O "Fuel pump relay (non-immobiliser)" [low_side_out] is wired to MAXXECUSTREE-C1-M3 "INJ 5" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | UNMAPPED | OEM | 32 optional OEM pins are not mapped: OEM-2-E EGR valve; OEM-2-F EGR valve; OEM-2-H EGR valve; OEM-2-I EGR valve; OEM-2-N VTCS solenoid (intake butterflies); OEM-2-Q ISC valve low side; OEM-2-R Malfunction indicator lamp (MIL); OEM-3-C Purge solenoid valve; OEM-3-D EGR boost solenoid; OEM-3-J Front O2 heater; OEM-3-K EVAP leak detection pump; OEM-3-M Alternator control; OEM-3-O Tachometer output; OEM-3-P Rear O2 heater; OEM-3-Q Data link connector (K-line); OEM-3-U Charge lamp; OEM-4-AA Rear O2 signal; OEM-4-AC Data link connector (DLC TEN, turbo); OEM-4-AD Fuel level; OEM-4-AH EVAP leak detection pump solenoid valve; OEM-4-B Brake switch; OEM-4-C Power steering pressure switch; OEM-4-E Boost control solenoid (turbo); 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; OEM-4-S Ignition switch (IG1) sense; OEM-4-T Generator output voltage (terminal P); OEM-4-W Front O2 signal; OEM-4-Z TCM (automatic only) |
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 2026-10-17. Review every wire against both manuals before building. Not wired: - OEM-4 AG: Constant +12V: MaxxECU MaxxECU STREET has no battery-constant input; not needed - OEM-4 M: Knock sensor: no free knock input on MaxxECU MaxxECU STREET - OEM-4 S: Ignition switch (IG1) sense: key-on 12 V sense — optional in a swap (the main relay is energized from keyed 12 V, not from this pin); MaxxECU MaxxECU STREET has no dedicated key-on input - OEM-4 E: Boost control solenoid (turbo): no free high_side/ls_hs on MaxxECU MaxxECU STREET - OEM-3 J: Front O2 heater: no free heater_low_side/low_side/relay_control/ls_hs/injector on MaxxECU MaxxECU STREET - OEM-3 P: Rear O2 heater: no free heater_low_side/low_side/relay_control/ls_hs/injector on MaxxECU MaxxECU STREET - OEM-2 Q: ISC valve low side: no free low_side/relay_control/heater_low_side/ls_hs/injector rated ≥ 1.0 A on MaxxECU MaxxECU STREET - OEM-2 E: EGR valve: no free low_side/relay_control/heater_low_side/ls_hs/injector on MaxxECU MaxxECU STREET - OEM-2 F: EGR valve: no free low_side/relay_control/heater_low_side/ls_hs/injector on MaxxECU MaxxECU STREET - OEM-2 H: EGR valve: no free low_side/relay_control/heater_low_side/ls_hs/injector on MaxxECU MaxxECU STREET - OEM-2 I: EGR valve: no free low_side/relay_control/heater_low_side/ls_hs/injector on MaxxECU MaxxECU STREET - OEM-2 N: VTCS solenoid (intake butterflies): no free low_side/relay_control/heater_low_side/ls_hs/injector on MaxxECU MaxxECU STREET - OEM-2 R: Malfunction indicator lamp (MIL): no free low_side/relay_control/heater_low_side/ls_hs/injector on MaxxECU MaxxECU STREET - OEM-3 C: Purge solenoid valve: no free low_side/relay_control/heater_low_side/ls_hs/injector on MaxxECU MaxxECU STREET - OEM-3 K: EVAP leak detection pump: no free low_side/relay_control/heater_low_side/ls_hs/injector on MaxxECU MaxxECU STREET - OEM-3 M: Alternator control: no free low_side/relay_control/heater_low_side/ls_hs/injector on MaxxECU MaxxECU STREET - OEM-3 U: Charge lamp: no free low_side/relay_control/heater_low_side/ls_hs/injector on MaxxECU MaxxECU STREET - OEM-4 AH: EVAP leak detection pump solenoid valve: no free low_side/relay_control/heater_low_side/ls_hs/injector on MaxxECU MaxxECU STREET - OEM-3 O: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on MaxxECU MaxxECU STREET - OEM-4 AA: Rear O2 signal: no free o2_narrowband/analog_0_5 on MaxxECU MaxxECU STREET - OEM-4 W: Front O2 signal: no free o2_narrowband/analog_0_5 on MaxxECU MaxxECU STREET - OEM-4 AD: Fuel level: no free analog_0_5 on MaxxECU MaxxECU STREET - OEM-4 B: Brake switch: no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU STREET - OEM-4 C: Power steering pressure switch: no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU STREET - OEM-4 F: A/C request: no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU STREET - OEM-4 H: Neutral switch: no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU STREET - OEM-4 I: Clutch switch: no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU STREET - OEM-4 J: VTCS vacuum switch: no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU STREET - OEM-3 Q: Data link connector (K-line): no free k_line on MaxxECU MaxxECU STREET - OEM-4 AC: Data link connector (DLC TEN, turbo): no free k_line on MaxxECU MaxxECU STREET - OEM-3 D: EGR boost solenoid: not classified in the library; wire by hand - OEM-4 T: Generator output voltage (terminal P): not classified in the library; wire by hand - OEM-4 Z: TCM (automatic only): not classified in the library; wire by hand
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | oem_manual | 2005 Mazda MX-5 Miata Engine Performance Control System (PCM terminal voltage reference, BP and BP WITH TC) | https://trull.org/alex/pubmirror/www.mellens.net/mazda/Mazda-Miata-2005/engine_control_system.pdf | — | — | — |
| 4 | vendor_doc | Adaptronic eSel039 Select Plugin ECU for Mazda MX5 / Miata NB8B/C (OEM ECU pinout) | https://www.miataturbo.net/attachments/ecus-tuning-54/04-msm-ecu-pinout-104032/nb8bc_oem_ecu_pinouts-224948d1602912806 | — | — | — |
| 4 | vendor_doc | Bosch relay catalogue (mini ISO relays) | https://www.bosch-ibusiness.com/media/downloads/kataloge/relay/2025_10_bosch_relay_catalogue.pdf | archive | 2026-10-05 | 20344cff1ef3 |
| 4 | community_copy | Honda S2000 Service Manual 2000–2008, Fuel and Emissions Systems | https://www.s2000.wiki/view/images/7/7f/Service_Manual_2000-2008.pdf | archive | 2026-10-05 | a470cfc928e9 |
| 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 |
| 4 | vendor_doc | Omron G8V-RH-1C7T-R-DC12 high-current micro 280 automotive relay datasheet | https://www.alldatasheet.com/datasheet-pdf/pdf/333797/OMRON/G8V-RH-1C7T-R-DC12.html | — | 2026-10-05 | 764a0505a941 |