MX-5 Miata Mazdaspeed 2004-05 (BP-ZET turbo, no VVT) → DTAFast T2i (auto)
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 | 4: read the Findings page before cutting any wire |
| 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 |
| Terminals | 3-1447221-4 |
| 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 | T2I-C1-31 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-4-AG | T2I-C1-21 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-3-A | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-3-B | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-4-A | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | T2I-C1-13 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | T2I-C1-14 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-4-O | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-0V-1 | T2I-C1-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | SP-0V-1 | T2I-C1-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-4-L | T2I-C1-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-3-Y | T2I-C1-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-3-V | T2I-C1-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-3-F | T2I-C1-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-3-I | T2I-C1-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-4-X | T2I-C1-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-4-V | T2I-C1-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-4-P | T2I-C1-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-2-B | T2I-C1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-2-C | T2I-C1-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-2-K | T2I-C1-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-2-M | T2I-C1-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-3-H | T2I-C1-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-4-AE | T2I-C1-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-4-AA | T2I-C1-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-4-W | T2I-C1-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-4-R | T2I-C1-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-4-N | T2I-C1-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-3-T | T2I-C1-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-3-S | T2I-C1-30 | 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 | T2I-C1-21 | T2I-C1-28 | open (OL) | +12 V supply must not touch sensor ground | |
| 2 | T2I-C1-27 | T2I-C1-28 | open (OL) | 5 V sensor reference must not touch sensor ground | |
| 3 | T2I-C1-31 | T2I-C1-13 | open (OL) | +12 V supply must not touch power ground | |
| 4 | T2I-C1-31 | T2I-C1-28 | open (OL) | +12 V supply must not touch sensor ground | |
| 5 | T2I-C1-13 | T2I-C1-21 | open (OL) | power ground must not touch +12 V supply | |
| 6 | T2I-C1-13 | T2I-C1-27 | open (OL) | power ground must not touch 5 V sensor reference | |
| 7 | T2I-C1-21 | T2I-C1-27 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 8 | T2I-C1-31 | T2I-C1-27 | 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
OEM-2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Injector 1 | — | — | — | — | — | — | — | — |
| B | Cooling fan relay | — | W21 | — | 0.5 | T2I-C1-1 | — | — | — |
| C | Condenser fan relay | — | W22 | — | 0.5 | T2I-C1-10 | — | — | — |
| D | Injector 2 | — | — | — | — | — | — | — | — |
| E | EGR valve | — | — | — | — | — | — | — | — |
| F | EGR valve | — | — | — | — | — | — | — | — |
| G | Injector 3 | — | — | — | — | — | — | — | — |
| H | EGR valve | — | — | — | — | — | — | — | — |
| I | EGR valve | — | — | — | — | — | — | — | — |
| J | Injector 4 | — | — | — | — | — | — | — | — |
| K | A/C clutch relay | — | W23 | — | 0.5 | T2I-C1-18 | — | — | — |
| L | NC | — | — | — | — | — | — | — | — |
| M | Fuel pump relay | — | W24 | — | 0.5 | T2I-C1-26 | — | — | — |
| N | VTCS solenoid (intake butterflies) | — | — | — | — | — | — | — | — |
| O | Fuel pump relay (non-immobiliser) | — | — | — | — | — | — | — | — |
| 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 | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| B | Power ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| C | Purge solenoid valve | — | — | — | — | — | — | — | — |
| D | EGR boost solenoid | — | — | — | — | — | — | — | — |
| E | NC | — | — | — | — | — | — | — | — |
| F | Ignition 1 (coils 1+4, wasted spark) | — | W16 | — | 0.5 | T2I-C1-3 | — | — | — |
| G | NC | — | — | — | — | — | — | — | — |
| H | Main relay | — | W25 | — | 0.5 | T2I-C1-15 | — | — | — |
| I | Ignition 2 (coils 2+3, wasted spark) | — | W17 | — | 0.5 | T2I-C1-6 | — | — | — |
| 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 | — | W32 | — | 0.5 | T2I-C1-30 | — | — | — |
| T | Vehicle speed | — | W31 | — | 0.5 | T2I-C1-11 | — | — | — |
| U | Charge lamp | — | — | — | — | — | — | — | — |
| V | Cam position (CMP) | — | W15 | — | 0.5 | T2I-C1-12 | — | — | — |
| W | NC | — | — | — | — | — | — | — | — |
| X | NC | — | — | — | — | — | — | — | — |
| Y | Crank position (CKP) | — | W14 | — | 0.5 | T2I-C1-19 | — | — | — |
| Z | NC | — | — | — | — | — | — | — | — |
OEM-4
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Power ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| AA | Rear O2 signal | — | W27 | — | 0.5 | T2I-C1-25 | — | — | — |
| AB | NC | — | — | — | — | — | — | — | — |
| AC | Data link connector (DLC TEN, turbo) | — | — | — | — | — | — | — | — |
| AD | Fuel level | — | — | — | — | — | — | — | — |
| AE | BARO/MAP sensor (turbo boost pressure) | — | W26 | — | 0.5 | T2I-C1-23 | — | — | — |
| AF | ECU power +14V (main relay) | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| AG | Constant +12V | — | W4 | — | 0.85 | T2I-C1-21 | — | — | — |
| AH | EVAP leak detection pump solenoid valve | — | — | — | — | — | — | — | — |
| B | Brake switch | — | — | — | — | — | — | — | — |
| C | Power steering pressure switch | — | — | — | — | — | — | — | — |
| D | Boost control solenoid (turbo) | — | — | — | — | — | — | — | — |
| 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 | — | W13 | — | 0.5 | T2I-C1-27 | — | — | — |
| M | Knock sensor | — | — | — | — | — | — | — | — |
| N | Intake air temperature (IAT) | — | W30 | — | 0.5 | T2I-C1-34 | — | — | — |
| O | Signal ground | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| P | Coolant temperature (ECT) | — | W20 | — | 0.5 | T2I-C1-24 | — | — | — |
| Q | NC | — | — | — | — | — | — | — | — |
| R | Intake air temperature 2 (IAT2, turbo) | — | W29 | — | 0.5 | T2I-C1-32 | — | — | — |
| S | Ignition switch (IG1) sense | — | — | — | — | — | — | — | — |
| T | Generator output voltage (terminal P) | — | — | — | — | — | — | — | — |
| U | NC | — | — | — | — | — | — | — | — |
| V | Throttle position (TPS) | — | W19 | — | 0.5 | T2I-C1-22 | — | — | — |
| W | Front O2 signal | — | W28 | — | 0.5 | T2I-C1-33 | — | — | — |
| X | Mass air flow (MAF) | — | W18 | — | 0.5 | T2I-C1-20 | — | — | — |
| Y | NC | — | — | — | — | — | — | — | — |
| Z | TCM (automatic only) | — | — | — | — | — | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W10 | — | 0.5 | OEM-4-O | — | — | — |
| 1 | — | — | W11 | — | 0.5 | T2I-C1-28 | — | — | — |
| 1 | — | — | W12 | — | 0.5 | T2I-C1-29 | — | — | — |
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 | T2I-C1-31 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W5 | — | 0.85 | OEM-3-A | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-3-B | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-4-A | — | — | — |
| 1 | — | — | W8 | — | 0.85 | T2I-C1-13 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | T2I-C1-14 | — | — | — |
T2I-C1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | PWM 1 | — | W21 | — | 0.5 | OEM-2-B | — | — | — |
| 2 | Lambda Nernst Voltage | — | — | — | — | — | — | — | — |
| 3 | Coil 1 | — | W16 | — | 0.5 | OEM-3-F | — | — | — |
| 4 | Lambda VGND | — | — | — | — | — | — | — | — |
| 5 | Lambda Pump Current | — | — | — | — | — | — | — | — |
| 6 | Coil 2 | — | W17 | — | 0.5 | OEM-3-I | — | — | — |
| 7 | Lambda Trim Resistor | — | — | — | — | — | — | — | — |
| 8 | — | — | — | — | — | — | — | — | — |
| 9 | — | — | — | — | — | — | — | — | — |
| 10 | PWM 2 | — | W22 | — | 0.5 | OEM-2-C | — | — | — |
| 11 | Digital 1 | — | W31 | — | 0.5 | OEM-3-T | — | — | — |
| 12 | Wheel 1 | — | W15 | — | 0.5 | OEM-3-V | — | — | — |
| 13 | Power Ground 1 | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 14 | Power Ground 2 | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| 15 | Lambda Heater Negative | — | W25 | — | 0.5 | OEM-3-H | — | — | — |
| 16 | CAN High | — | — | — | — | — | — | — | — |
| 17 | CAN Low | — | — | — | — | — | — | — | — |
| 18 | PWM 3 | — | W23 | — | 0.5 | OEM-2-K | — | — | — |
| 19 | Crank | — | W14 | — | 0.5 | OEM-3-Y | — | — | — |
| 20 | Analogue 1 | — | W18 | — | 0.5 | OEM-4-X | — | — | — |
| 21 | Permanent 12v | — | W4 | — | 0.85 | OEM-4-AG | — | — | — |
| 22 | Analogue 2 | — | W19 | — | 0.5 | OEM-4-V | — | — | — |
| 23 | Analogue 3 | — | W26 | — | 0.5 | OEM-4-AE | — | — | — |
| 24 | Thermistor 1 | — | W20 | — | 0.5 | OEM-4-P | — | — | — |
| 25 | Analogue 4 | — | W27 | — | 0.5 | OEM-4-AA | — | — | — |
| 26 | PWM 4 | — | W24 | — | 0.5 | OEM-2-M | — | — | — |
| 27 | 5v Output | — | W13 | — | 0.5 | OEM-4-L | — | — | — |
| 28 | Sensor Ground | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| 29 | Sensor Ground | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 30 | Digital 2 | — | W32 | — | 0.5 | OEM-3-S | — | — | — |
| 31 | Ignition 12v In | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 32 | Thermistor 2 | — | W29 | — | 0.5 | OEM-4-R | — | — | — |
| 33 | Analogue 5 | — | W28 | — | 0.5 | OEM-4-W | — | — | — |
| 34 | Analogue 6 | — | W30 | — | 0.5 | OEM-4-N | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-2-A | Injector 1 | injector_out | — | — | — | corroborated | |
| OEM-2-B | Cooling fan relay | low_side_out | T2I-C1-1 | PWM 1 | low_side_out | corroborated | |
| OEM-2-C | Condenser fan relay | low_side_out | T2I-C1-10 | PWM 2 | low_side_out | corroborated | |
| OEM-2-D | Injector 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 | — | — | — | 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 | — | — | — | corroborated | |
| OEM-2-K | A/C clutch relay | low_side_out | T2I-C1-18 | PWM 3 | low_side_out | corroborated | |
| OEM-2-L | NC | — | — | — | — | single_source | |
| OEM-2-M | Fuel pump relay | low_side_out | T2I-C1-26 | PWM 4 | 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 | — | — | — | corroborated | |
| OEM-2-P | ISC valve +14V feed | power_in | T2I-C1-31 | Ignition 12v In | power_in | 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 | T2I-C1-13 + T2I-C1-14 | Power Ground 1 + Power Ground 2 | ground | corroborated | |
| OEM-3-B | Power ground | ground | T2I-C1-13 + T2I-C1-14 | Power Ground 1 + Power Ground 2 | 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 | T2I-C1-3 | Coil 1 | ignition_out | corroborated | |
| OEM-3-G | NC | — | — | — | — | single_source | |
| OEM-3-H | Main relay | low_side_out | T2I-C1-15 | Lambda Heater Negative | low_side_out | corroborated | |
| OEM-3-I | Ignition 2 (coils 2+3, wasted spark) | ignition_out | T2I-C1-6 | Coil 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 | T2I-C1-30 | Digital 2 | digital_in | corroborated | |
| OEM-3-T | Vehicle speed | digital_in | T2I-C1-11 | Digital 1 | digital_in | corroborated | |
| OEM-3-U | Charge lamp | low_side_out | — | — | — | corroborated | |
| OEM-3-V | Cam position (CMP) | trigger_in | T2I-C1-12 | Wheel 1 | digital_in | corroborated | |
| OEM-3-W | NC | — | — | — | — | single_source | |
| OEM-3-X | NC | — | — | — | — | single_source | |
| OEM-3-Y | Crank position (CKP) | trigger_in | T2I-C1-19 | Crank | trigger_in | corroborated | |
| OEM-3-Z | NC | — | — | — | — | single_source | |
| OEM-4-A | Power ground | ground | T2I-C1-13 + T2I-C1-14 | Power Ground 1 + Power Ground 2 | ground | corroborated | |
| OEM-4-AA | Rear O2 signal | lambda_nb_in | T2I-C1-25 | Analogue 4 | analog_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 | T2I-C1-23 | Analogue 3 | analog_in | LY | single_source |
| OEM-4-AF | ECU power +14V (main relay) | power_in | T2I-C1-31 | Ignition 12v In | power_in | corroborated | |
| OEM-4-AG | Constant +12V | power_in | T2I-C1-21 | Permanent 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 | — | — | — | 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 | T2I-C1-27 | 5v Output | vref | corroborated | |
| OEM-4-M | Knock sensor | knock_in | — | — | — | corroborated | |
| OEM-4-N | Intake air temperature (IAT) | temp_in | T2I-C1-34 | Analogue 6 | analog_in | corroborated | |
| OEM-4-O | Signal ground | sensor_ground | T2I-C1-28 + T2I-C1-29 | Sensor Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-4-P | Coolant temperature (ECT) | temp_in | T2I-C1-24 | Thermistor 1 | temp_in | corroborated | |
| OEM-4-Q | NC | — | — | — | — | single_source | |
| OEM-4-R | Intake air temperature 2 (IAT2, turbo) | temp_in | T2I-C1-32 | Thermistor 2 | 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 | T2I-C1-22 | Analogue 2 | analog_in | corroborated | |
| OEM-4-W | Front O2 signal | lambda_nb_in | T2I-C1-33 | Analogue 5 | analog_in | corroborated | |
| OEM-4-X | Mass air flow (MAF) | analog_in | T2I-C1-20 | Analogue 1 | 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 | T2I-C1-31 | 0.85 | no route | Ignition 12v In | — | |
| W4 | OEM-4-AG | T2I-C1-21 | 0.85 | no route | Constant +12V | — | |
| W5 | OEM-3-A | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W6 | OEM-3-B | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W7 | OEM-4-A | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W8 | SP-GND-1 | T2I-C1-13 | 0.85 | no route | Power Ground 1 | — | |
| W9 | SP-GND-1 | T2I-C1-14 | 0.85 | no route | Power Ground 2 | — | |
| W10 | OEM-4-O | SP-0V-1 | 0.5 | no route | Signal ground | — | |
| W11 | SP-0V-1 | T2I-C1-28 | 0.5 | no route | Sensor Ground | — | |
| W12 | SP-0V-1 | T2I-C1-29 | 0.5 | no route | Sensor Ground | — | |
| W13 | OEM-4-L | T2I-C1-27 | 0.5 | no route | +5V sensor supply | — | |
| W14 | OEM-3-Y | T2I-C1-19 | 0.5 | no route | Crank position (CKP) | — | |
| W15 | OEM-3-V | T2I-C1-12 | 0.5 | no route | Cam position (CMP) | — | |
| W16 | OEM-3-F | T2I-C1-3 | 0.5 | no route | Ignition 1 (coils 1+4, wasted spark) | — | |
| W17 | OEM-3-I | T2I-C1-6 | 0.5 | no route | Ignition 2 (coils 2+3, wasted spark) | — | |
| W18 | OEM-4-X | T2I-C1-20 | 0.5 | no route | Mass air flow (MAF) | — | |
| W19 | OEM-4-V | T2I-C1-22 | 0.5 | no route | Throttle position (TPS) | — | |
| W20 | OEM-4-P | T2I-C1-24 | 0.5 | no route | Coolant temperature (ECT) | — | |
| W21 | OEM-2-B | T2I-C1-1 | 0.5 | no route | Cooling fan relay | — | |
| W22 | OEM-2-C | T2I-C1-10 | 0.5 | no route | Condenser fan relay | — | |
| W23 | OEM-2-K | T2I-C1-18 | 0.5 | no route | A/C clutch relay | — | |
| W24 | OEM-2-M | T2I-C1-26 | 0.5 | no route | Fuel pump relay | — | |
| W25 | OEM-3-H | T2I-C1-15 | 0.5 | no route | Main relay | — | |
| W26 | OEM-4-AE | T2I-C1-23 | 0.5 | no route | BARO/MAP sensor (turbo boost pressure) | — | |
| W27 | OEM-4-AA | T2I-C1-25 | 0.5 | no route | Rear O2 signal | — | |
| W28 | OEM-4-W | T2I-C1-33 | 0.5 | no route | Front O2 signal | — | |
| W29 | OEM-4-R | T2I-C1-32 | 0.5 | no route | Intake air temperature 2 (IAT2, turbo) | — | |
| W30 | OEM-4-N | T2I-C1-34 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W31 | OEM-3-T | T2I-C1-11 | 0.5 | no route | Vehicle speed | — | |
| W32 | OEM-3-S | T2I-C1-30 | 0.5 | no route | Immobiliser | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|---|---|---|---|---|
| connector | 4-1437290-0 | TE | Superseal 1.0 34-way plug, Key 1 | 1.000 | ea |
| terminal | 3-1447221-4 | TE | Superseal 1.0 socket terminal, 20 AWG (0.5 sq mm) | 26.000 | ea |
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| No configured channels. | |||||||
Findings
Open (9)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | REQUIRED_UNMAPPED | OEM-2-A | Required OEM function "Injector 1" (injector_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-2-D | Required OEM function "Injector 2" (injector_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-2-G | Required OEM function "Injector 3" (injector_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-2-J | Required OEM function "Injector 4" (injector_out) is not connected to the new ECU. |
| warn | DATASET_GAP | T2i C1 | 2 of 34 cavities on T2i C1 have no pin data (8,9). Anything there is invisible to these checks. |
| warn | LOAD_UNKNOWN | T2I-C1-15 | T2I-C1-15 "Lambda Heater Negative" drives OEM-3-H Main relay (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | NET_FAMILY | OEM-3-V ↔ T2I-C1-12 | OEM-3-V "Cam position (CMP)" [trigger_in] is wired to T2I-C1-12 "Wheel 1" [digital_in]. Hall-type cam/speed signals can use a digital input if it handles the frequency; VR signals cannot. |
| info | NET_FAMILY | OEM-4-N ↔ T2I-C1-34 | OEM-4-N "Intake air temperature (IAT)" [temp_in] is wired to T2I-C1-34 "Analogue 6" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| 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-O Fuel pump relay (non-immobiliser); 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-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-D Boost control solenoid (turbo); 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-Z TCM (automatic only) |
Accepted (0)
| Code | Subject | Reason | By |
|---|
Notes
Fit check: unconfirmed. Confirm these before building: - Knock input count not found - Only 2 ignition outputs for 4 cylinders: wasted spark (pair coils per firing order) Auto-mapped by auto_map() from the library pin data on 2026-10-17. Review every wire against both manuals before building. Open items: - OEM-2 A: Injector 1: no free injector output on DTAFast T2i - OEM-2 D: Injector 2: no free injector output on DTAFast T2i - OEM-2 G: Injector 3: no free injector output on DTAFast T2i - OEM-2 J: Injector 4: no free injector output on DTAFast T2i Not wired: - OEM-4 M: Knock sensor: no free knock input on DTAFast T2i - 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); DTAFast T2i has no dedicated key-on input - OEM-2 O: Fuel pump relay (non-immobiliser): no free relay_control/low_side/heater_low_side/ls_hs/injector on DTAFast T2i - OEM-4 D: Boost control solenoid (turbo): no free high_side/ls_hs on DTAFast T2i - OEM-4 E: Boost control solenoid (turbo): no free high_side/ls_hs on DTAFast T2i - OEM-3 J: Front O2 heater: no free heater_low_side/low_side/relay_control/ls_hs/injector on DTAFast T2i - OEM-3 P: Rear O2 heater: no free heater_low_side/low_side/relay_control/ls_hs/injector on DTAFast T2i - OEM-2 Q: ISC valve low side: no free low_side/relay_control/heater_low_side/ls_hs/injector rated ≥ 1.0 A on DTAFast T2i - OEM-2 E: EGR valve: no free low_side/relay_control/heater_low_side/ls_hs/injector on DTAFast T2i - OEM-2 F: EGR valve: no free low_side/relay_control/heater_low_side/ls_hs/injector on DTAFast T2i - OEM-2 H: EGR valve: no free low_side/relay_control/heater_low_side/ls_hs/injector on DTAFast T2i - OEM-2 I: EGR valve: no free low_side/relay_control/heater_low_side/ls_hs/injector on DTAFast T2i - OEM-2 N: VTCS solenoid (intake butterflies): no free low_side/relay_control/heater_low_side/ls_hs/injector on DTAFast T2i - OEM-2 R: Malfunction indicator lamp (MIL): no free low_side/relay_control/heater_low_side/ls_hs/injector on DTAFast T2i - OEM-3 C: Purge solenoid valve: no free low_side/relay_control/heater_low_side/ls_hs/injector on DTAFast T2i - OEM-3 K: EVAP leak detection pump: no free low_side/relay_control/heater_low_side/ls_hs/injector on DTAFast T2i - OEM-3 M: Alternator control: no free low_side/relay_control/heater_low_side/ls_hs/injector on DTAFast T2i - OEM-3 U: Charge lamp: no free low_side/relay_control/heater_low_side/ls_hs/injector on DTAFast T2i - OEM-4 AH: EVAP leak detection pump solenoid valve: no free low_side/relay_control/heater_low_side/ls_hs/injector on DTAFast T2i - OEM-3 O: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on DTAFast T2i - OEM-4 AD: Fuel level: no free analog_0_5 on DTAFast T2i - OEM-4 B: Brake switch: no free switch_in/frequency_in/analog_0_5 on DTAFast T2i - OEM-4 C: Power steering pressure switch: no free switch_in/frequency_in/analog_0_5 on DTAFast T2i - OEM-4 F: A/C request: no free switch_in/frequency_in/analog_0_5 on DTAFast T2i - OEM-4 H: Neutral switch: no free switch_in/frequency_in/analog_0_5 on DTAFast T2i - OEM-4 I: Clutch switch: no free switch_in/frequency_in/analog_0_5 on DTAFast T2i - OEM-4 J: VTCS vacuum switch: no free switch_in/frequency_in/analog_0_5 on DTAFast T2i - OEM-3 Q: Data link connector (K-line): no free k_line on DTAFast T2i - OEM-4 AC: Data link connector (DLC TEN, turbo): no free k_line on DTAFast T2i - 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 | DTAFast T2i ECU wiring diagram | https://cdn.shopify.com/s/files/1/0848/7508/4108/files/T2i_Wiring-Diagram.pdf?v=1728571341 | — | — | — |
| 4 | vendor_doc | Link G4X MX5NB2X install manual (NB2 2001-05) | https://linkecu.com/documentation/MX5XNB2.pdf | archive | 2026-10-05 | 741efdd9f2c8 |