MX-5 Miata NA8 1996-97 (BP-ZE, 1.8, OBD-II) → DTAFast P8 (auto)
MX-5 Miata NA8 1996-97 (BP-ZE, 1.8, OBD-II) — DTAFast — P8
Drawn by Michael Gnankou · Rev 0 · proposal · 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 | proposal · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | none |
| Size of the job | 52 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 | P8-C1-19 | 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 | P8-C1-15 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | P8-C1-34 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | P8-C1-55 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-3-O | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-4-H | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | SP-0V-1 | P8-C1-46 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | SP-0V-1 | P8-C1-47 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | SP-0V-1 | P8-C1-49 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | SP-0V-1 | P8-C1-51 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-3-I | P8-C1-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-4-E | P8-C1-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-4-G | P8-C1-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-4-F | P8-C1-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-4-N | P8-C1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-4-R | P8-C1-38 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-4-U | P8-C1-37 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-4-V | P8-C1-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-4-W | P8-C1-54 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-4-X | P8-C1-36 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-3-B | P8-C1-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-3-F | P8-C1-48 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-3-G | P8-C1-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-1-A | P8-C1-41 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-1-B | P8-C1-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-1-G | P8-C1-43 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-1-U | P8-C1-42 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-3-M | P8-C1-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-1-E | P8-C1-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-4-J | P8-C1-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-4-O | P8-C1-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-4-P | P8-C1-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-4-Q | P8-C1-35 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-4-T | P8-C1-53 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-4-L | P8-C1-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-3-H | P8-C1-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-3-N | P8-C1-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-3-C | P8-C1-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-3-D | P8-C1-44 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-3-K | P8-C1-45 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-1-M | P8-C1-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-1-C | P8-C1-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | OEM-1-K | P8-C1-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W49 | OEM-1-L | P8-C1-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W50 | OEM-1-Q | P8-C1-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W51 | OEM-3-L | P8-C1-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W52 | OEM-3-P | P8-C1-50 | 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 | P8-C1-10 | P8-C1-15 | open (OL) | 5 V sensor reference must not touch power ground | |
| 2 | P8-C1-10 | P8-C1-46 | open (OL) | 5 V sensor reference must not touch sensor ground | |
| 3 | P8-C1-10 | P8-C1-19 | open (OL) | 5 V sensor reference must not touch +12 V supply | |
| 4 | P8-C1-15 | P8-C1-19 | open (OL) | power ground must not touch +12 V supply | |
| 5 | P8-C1-46 | P8-C1-19 | open (OL) | sensor 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
OEM-1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Cooling fan relay (low-side) | — | W29 | — | 0.5 | P8-C1-41 | — | — | — |
| B | A/C condenser fan relay | — | W30 | — | 0.5 | P8-C1-5 | — | — | — |
| C | Starter input (12V while cranking) | — | W47 | — | 0.5 | P8-C1-13 | — | — | — |
| E | Check engine light (MIL) | — | W34 | — | 0.5 | P8-C1-6 | — | — | — |
| G | A/C clutch relay | — | W31 | — | 0.5 | P8-C1-43 | — | — | — |
| K | A/C pressure switch (A/C request) | — | W48 | — | 0.5 | P8-C1-14 | — | — | — |
| L | Clutch switch | — | W49 | — | 0.5 | P8-C1-31 | — | — | — |
| M | Vehicle speed sensor (VSS) | — | W46 | — | 0.5 | P8-C1-11 | — | — | — |
| Q | Brake switch | — | W50 | — | 0.5 | P8-C1-32 | — | — | — |
| U | Fuel pump relay (low-side) | — | W32 | — | 0.5 | P8-C1-42 | — | — | — |
OEM-3
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| B | MAF sensor input | — | W26 | — | 0.5 | P8-C1-25 | — | — | — |
| C | Front O2 sensor input | — | W43 | — | 0.5 | P8-C1-12 | — | — | — |
| D | Rear O2 sensor input | — | W44 | — | 0.5 | P8-C1-44 | — | — | — |
| F | Throttle position (TPS) | — | W27 | — | 0.5 | P8-C1-48 | — | — | — |
| G | Engine coolant temp (CLT) | — | W28 | — | 0.5 | P8-C1-26 | — | — | — |
| H | EGR boost sensor | — | W41 | — | 0.5 | P8-C1-30 | — | — | — |
| I | +5V sensor reference | — | W16 | — | 0.5 | P8-C1-10 | — | — | — |
| J | EGR valve position sensor | — | — | — | — | — | — | — | — |
| K | Intake air temp (IAT) | — | W45 | — | 0.5 | P8-C1-45 | — | — | — |
| L | Idle switch (closed throttle) | — | W51 | — | 0.5 | P8-C1-33 | — | — | — |
| M | Front O2 heater control | — | W33 | — | 0.5 | P8-C1-21 | — | — | — |
| N | EGR boost sensor (2nd channel) | — | W42 | — | 0.5 | P8-C1-7 | — | — | — |
| O | Sensor ground | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| P | Power steering pressure switch | — | W52 | — | 0.5 | P8-C1-50 | — | — | — |
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 | — | W17 | — | 0.5 | P8-C1-8 | — | — | — |
| F | CAS SGT (cam trigger) | — | W19 | — | 0.5 | P8-C1-29 | — | — | — |
| G | CAS SGC (cam sync) | — | W18 | — | 0.5 | P8-C1-27 | — | — | — |
| H | Crank pickup timing ground (CKP gnd) | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| I | Permanent +12V (battery) | — | — | — | — | — | — | — | — |
| J | PRC solenoid (FPR control) | — | W35 | — | 0.5 | P8-C1-23 | — | — | — |
| K | Chassis ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| L | Tachometer output | — | W40 | — | 0.5 | P8-C1-24 | — | — | — |
| N | Ignition coil trigger (cyl 1&4) | — | W20 | — | 0.5 | P8-C1-1 | — | — | — |
| O | EGR vent solenoid | — | W36 | — | 0.5 | P8-C1-4 | — | — | — |
| P | EGR vacuum solenoid | — | W37 | — | 0.5 | P8-C1-17 | — | — | — |
| Q | Idle air control (IAC) valve | — | W38 | — | 0.5 | P8-C1-35 | — | — | — |
| R | Ignition coil trigger (cyl 2&3) | — | W21 | — | 0.5 | P8-C1-38 | — | — | — |
| T | EVAP purge solenoid | — | W39 | — | 0.5 | P8-C1-53 | — | — | — |
| U | Injector 1 (cyl 1) | — | W22 | — | 0.5 | P8-C1-37 | — | — | — |
| V | Injector 2 (cyl 2) | — | W23 | — | 0.5 | P8-C1-18 | — | — | — |
| W | Injector 3 (cyl 3) | — | W24 | — | 0.5 | P8-C1-54 | — | — | — |
| X | Injector 4 (cyl 4) | — | W25 | — | 0.5 | P8-C1-36 | — | — | — |
P8-C1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Coil 1 | — | W20 | — | 0.5 | OEM-4-N | — | — | — |
| 10 | 5 Volts | — | W16 | — | 0.5 | OEM-3-I | — | — | — |
| 11 | Undriven Wheel (must) | — | W46 | — | 0.5 | OEM-1-M | — | — | — |
| 12 | Lambda Signal | — | W43 | — | 0.5 | OEM-3-C | — | — | — |
| 13 | Map2/ALS/Ana1 On/Off | — | W47 | — | 0.5 | OEM-1-C | — | — | — |
| 14 | Traction Wet/Dry | — | W48 | — | 0.5 | OEM-1-K | — | — | — |
| 15 | Power Ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 16 | Injector 8 | — | — | — | — | — | — | — | — |
| 17 | Injector 5 | — | W37 | — | 0.5 | OEM-4-P | — | — | — |
| 18 | Injector 2 | — | W23 | — | 0.5 | OEM-4-V | — | — | — |
| 19 | 12 Volts | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 2 | Coil 4 | — | — | — | — | — | — | — | — |
| 20 | Coil 3 | — | — | — | — | — | — | — | — |
| 21 | Turbo Pressure Valve | — | W33 | — | 0.5 | OEM-3-M | — | — | — |
| 22 | Coil 8/or Aux5 | — | — | — | — | — | — | — | — |
| 23 | Turbo ALS Valve | — | W35 | — | 0.5 | OEM-4-J | — | — | — |
| 24 | Tacho | — | W40 | — | 0.5 | OEM-4-L | — | — | — |
| 25 | Analogue Input 1 | — | W26 | — | 0.5 | OEM-3-B | — | — | — |
| 26 | Water Temp | — | W28 | — | 0.5 | OEM-3-G | — | — | — |
| 27 | Cam Sensor | — | W18 | — | 0.5 | OEM-4-G | — | — | — |
| 28 | 5 Volts | — | — | — | — | — | — | — | — |
| 29 | Left Driven Wheel | — | W19 | — | 0.5 | OEM-4-F | — | — | — |
| 3 | Coil 6 | — | — | — | — | — | — | — | — |
| 30 | Map | — | W41 | — | 0.5 | OEM-3-H | — | — | — |
| 31 | Launch Button | — | W49 | — | 0.5 | OEM-1-L | — | — | — |
| 32 | Traction On/Off | — | W50 | — | 0.5 | OEM-1-Q | — | — | — |
| 33 | Shift Cut | — | W51 | — | 0.5 | OEM-3-L | — | — | — |
| 34 | Power Ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 35 | Injector 6 | — | W38 | — | 0.5 | OEM-4-Q | — | — | — |
| 36 | Injector 4 | — | W25 | — | 0.5 | OEM-4-X | — | — | — |
| 37 | Injector 1 | — | W22 | — | 0.5 | OEM-4-U | — | — | — |
| 38 | Coil 2 | — | W21 | — | 0.5 | OEM-4-R | — | — | — |
| 39 | Coil 5 | — | — | — | — | — | — | — | — |
| 4 | Idle Valve | — | W36 | — | 0.5 | OEM-4-O | — | — | — |
| 40 | Coil 7 | — | — | — | — | — | — | — | — |
| 41 | Fuel Pump Relay | — | W29 | — | 0.5 | OEM-1-A | — | — | — |
| 42 | Cam Phase Valve/Aux Out 4 | — | W32 | — | 0.5 | OEM-1-U | — | — | — |
| 43 | Aux Out 3 | — | W31 | — | 0.5 | OEM-1-G | — | — | — |
| 44 | Analogue Input 3 | — | W44 | — | 0.5 | OEM-3-D | — | — | — |
| 45 | Air Temp | — | W45 | — | 0.5 | OEM-3-K | — | — | — |
| 46 | Signal Ground | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 47 | Signal Ground | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 48 | Throttle Wiper | — | W27 | — | 0.5 | OEM-3-F | — | — | — |
| 49 | Lambda Earth | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 5 | Aux Out 2 | — | W30 | — | 0.5 | OEM-1-B | — | — | — |
| 50 | Undriven Wheel (optional) | — | W52 | — | 0.5 | OEM-3-P | — | — | — |
| 51 | Signal Ground | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 52 | 5 Volts | — | — | — | — | — | — | — | — |
| 53 | Injector 7 | — | W39 | — | 0.5 | OEM-4-T | — | — | — |
| 54 | Injector 3 | — | W24 | — | 0.5 | OEM-4-W | — | — | — |
| 55 | Power Ground | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| 6 | Shift Light | — | W34 | — | 0.5 | OEM-1-E | — | — | — |
| 7 | Analogue Input 2 Or Log Switch | — | W42 | — | 0.5 | OEM-3-N | — | — | — |
| 8 | Crank Sensor | — | W17 | — | 0.5 | OEM-4-E | — | — | — |
| 9 | Right Driven Wheel | — | — | — | — | — | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W10 | — | 0.5 | OEM-3-O | — | — | — |
| 1 | — | — | W11 | — | 0.5 | OEM-4-H | — | — | — |
| 1 | — | — | W12 | — | 0.5 | P8-C1-46 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | P8-C1-47 | — | — | — |
| 1 | — | — | W14 | — | 0.5 | P8-C1-49 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | P8-C1-51 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-4-B | — | — | — |
| 1 | — | — | W2 | — | 0.85 | P8-C1-19 | — | — | — |
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 | P8-C1-15 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | P8-C1-34 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | P8-C1-55 | — | — | — |
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 | P8-C1-41 | Fuel Pump Relay | low_side_out | corroborated | |
| OEM-1-B | A/C condenser fan relay | low_side_out | P8-C1-5 | Aux Out 2 | low_side_out | corroborated | |
| OEM-1-C | Starter input (12V while cranking) | digital_in | P8-C1-13 | Map2/ALS/Ana1 On/Off | digital_in | corroborated | |
| OEM-1-E | Check engine light (MIL) | low_side_out | P8-C1-6 | Shift Light | low_side_out | corroborated | |
| OEM-1-G | A/C clutch relay | low_side_out | P8-C1-43 | Aux Out 3 | low_side_out | corroborated | |
| OEM-1-K | A/C pressure switch (A/C request) | digital_in | P8-C1-14 | Traction Wet/Dry | digital_in | corroborated | |
| OEM-1-L | Clutch switch | digital_in | P8-C1-31 | Launch Button | digital_in | corroborated | |
| OEM-1-M | Vehicle speed sensor (VSS) | digital_in | P8-C1-11 | Undriven Wheel (must) | digital_in | corroborated | |
| OEM-1-Q | Brake switch | digital_in | P8-C1-32 | Traction On/Off | digital_in | corroborated | |
| OEM-1-U | Fuel pump relay (low-side) | low_side_out | P8-C1-42 | Cam Phase Valve/Aux Out 4 | low_side_out | corroborated | |
| OEM-3-B | MAF sensor input | analog_in | P8-C1-25 | Analogue Input 1 | analog_in | corroborated | |
| OEM-3-C | Front O2 sensor input | lambda_nb_in | P8-C1-12 | Lambda Signal | lambda_nb_in | corroborated | |
| OEM-3-D | Rear O2 sensor input | lambda_nb_in | P8-C1-44 | Analogue Input 3 | analog_in | corroborated | |
| OEM-3-F | Throttle position (TPS) | analog_in | P8-C1-48 | Throttle Wiper | analog_in | corroborated | |
| OEM-3-G | Engine coolant temp (CLT) | temp_in | P8-C1-26 | Water Temp | temp_in | corroborated | |
| OEM-3-H | EGR boost sensor | analog_in | P8-C1-30 | Map | analog_in | corroborated | |
| OEM-3-I | +5V sensor reference | vref | P8-C1-10 | 5 Volts | vref | corroborated | |
| OEM-3-J | EGR valve position sensor | analog_in | — | — | — | corroborated | |
| OEM-3-K | Intake air temp (IAT) | temp_in | P8-C1-45 | Air Temp | temp_in | corroborated | |
| OEM-3-L | Idle switch (closed throttle) | digital_in | P8-C1-33 | Shift Cut | digital_in | corroborated | |
| OEM-3-M | Front O2 heater control | low_side_out | P8-C1-21 | Turbo Pressure Valve | low_side_out | corroborated | |
| OEM-3-N | EGR boost sensor (2nd channel) | analog_in | P8-C1-7 | Analogue Input 2 Or Log Switch | analog_in | corroborated | |
| OEM-3-O | Sensor ground | sensor_ground | P8-C1-46 + P8-C1-47 + P8-C1-49 + P8-C1-51 | Signal Ground + Signal Ground + Lambda Earth + Signal Ground | sensor_ground | corroborated | |
| OEM-3-P | Power steering pressure switch | digital_in | P8-C1-50 | Undriven Wheel (optional) | digital_in | corroborated | |
| OEM-4-A | Chassis ground | ground | P8-C1-15 + P8-C1-34 + P8-C1-55 | Power Ground + Power Ground + Power Ground | ground | corroborated | |
| OEM-4-B | ECU power +12V (main relay) | power_in | P8-C1-19 | 12 Volts | power_in | corroborated | |
| OEM-4-C | Chassis ground | ground | P8-C1-15 + P8-C1-34 + P8-C1-55 | Power Ground + Power Ground + Power Ground | ground | corroborated | |
| OEM-4-D | Chassis ground | ground | P8-C1-15 + P8-C1-34 + P8-C1-55 | Power Ground + Power Ground + Power Ground | ground | corroborated | |
| OEM-4-E | Crank position (CKP) sensor | trigger_in | P8-C1-8 | Crank Sensor | trigger_in | corroborated | |
| OEM-4-F | CAS SGT (cam trigger) | trigger_in | P8-C1-29 | Left Driven Wheel | digital_in | corroborated | |
| OEM-4-G | CAS SGC (cam sync) | trigger_in | P8-C1-27 | Cam Sensor | trigger_in | corroborated | |
| OEM-4-H | Crank pickup timing ground (CKP gnd) | sensor_ground | P8-C1-46 + P8-C1-47 + P8-C1-49 + P8-C1-51 | Signal Ground + Signal Ground + Lambda Earth + Signal Ground | sensor_ground | corroborated | |
| OEM-4-I | Permanent +12V (battery) | power_in | — | — | — | corroborated | |
| OEM-4-J | PRC solenoid (FPR control) | low_side_out | P8-C1-23 | Turbo ALS Valve | low_side_out | corroborated | |
| OEM-4-K | Chassis ground | ground | P8-C1-15 + P8-C1-34 + P8-C1-55 | Power Ground + Power Ground + Power Ground | ground | corroborated | |
| OEM-4-L | Tachometer output | tacho_out | P8-C1-24 | Tacho | tacho_out | corroborated | |
| OEM-4-N | Ignition coil trigger (cyl 1&4) | ignition_out | P8-C1-1 | Coil 1 | ignition_out | corroborated | |
| OEM-4-O | EGR vent solenoid | low_side_out | P8-C1-4 | Idle Valve | low_side_out | corroborated | |
| OEM-4-P | EGR vacuum solenoid | low_side_out | P8-C1-17 | Injector 5 | injector_out | corroborated | |
| OEM-4-Q | Idle air control (IAC) valve | low_side_out | P8-C1-35 | Injector 6 | injector_out | corroborated | |
| OEM-4-R | Ignition coil trigger (cyl 2&3) | ignition_out | P8-C1-38 | Coil 2 | ignition_out | corroborated | |
| OEM-4-T | EVAP purge solenoid | low_side_out | P8-C1-53 | Injector 7 | injector_out | corroborated | |
| OEM-4-U | Injector 1 (cyl 1) | injector_out | P8-C1-37 | Injector 1 | injector_out | corroborated | |
| OEM-4-V | Injector 2 (cyl 2) | injector_out | P8-C1-18 | Injector 2 | injector_out | corroborated | |
| OEM-4-W | Injector 3 (cyl 3) | injector_out | P8-C1-54 | Injector 3 | injector_out | corroborated | |
| OEM-4-X | Injector 4 (cyl 4) | injector_out | P8-C1-36 | Injector 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 | P8-C1-19 | 0.85 | no route | 12 Volts | — | |
| 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 | P8-C1-15 | 0.85 | no route | Power Ground | — | |
| W8 | SP-GND-1 | P8-C1-34 | 0.85 | no route | Power Ground | — | |
| W9 | SP-GND-1 | P8-C1-55 | 0.85 | no route | Power Ground | — | |
| W10 | OEM-3-O | SP-0V-1 | 0.5 | no route | Sensor ground | — | |
| W11 | OEM-4-H | SP-0V-1 | 0.5 | no route | Crank pickup timing ground (CKP gnd) | — | |
| W12 | SP-0V-1 | P8-C1-46 | 0.5 | no route | Signal Ground | — | |
| W13 | SP-0V-1 | P8-C1-47 | 0.5 | no route | Signal Ground | — | |
| W14 | SP-0V-1 | P8-C1-49 | 0.5 | no route | Lambda Earth | — | |
| W15 | SP-0V-1 | P8-C1-51 | 0.5 | no route | Signal Ground | — | |
| W16 | OEM-3-I | P8-C1-10 | 0.5 | no route | +5V sensor reference | — | |
| W17 | OEM-4-E | P8-C1-8 | 0.5 | no route | Crank position (CKP) sensor | — | |
| W18 | OEM-4-G | P8-C1-27 | 0.5 | no route | CAS SGC (cam sync) | — | |
| W19 | OEM-4-F | P8-C1-29 | 0.5 | no route | CAS SGT (cam trigger) | — | |
| W20 | OEM-4-N | P8-C1-1 | 0.5 | no route | Ignition coil trigger (cyl 1&4) | — | |
| W21 | OEM-4-R | P8-C1-38 | 0.5 | no route | Ignition coil trigger (cyl 2&3) | — | |
| W22 | OEM-4-U | P8-C1-37 | 0.5 | no route | Injector 1 (cyl 1) | — | |
| W23 | OEM-4-V | P8-C1-18 | 0.5 | no route | Injector 2 (cyl 2) | — | |
| W24 | OEM-4-W | P8-C1-54 | 0.5 | no route | Injector 3 (cyl 3) | — | |
| W25 | OEM-4-X | P8-C1-36 | 0.5 | no route | Injector 4 (cyl 4) | — | |
| W26 | OEM-3-B | P8-C1-25 | 0.5 | no route | MAF sensor input | — | |
| W27 | OEM-3-F | P8-C1-48 | 0.5 | no route | Throttle position (TPS) | — | |
| W28 | OEM-3-G | P8-C1-26 | 0.5 | no route | Engine coolant temp (CLT) | — | |
| W29 | OEM-1-A | P8-C1-41 | 0.5 | no route | Cooling fan relay (low-side) | — | |
| W30 | OEM-1-B | P8-C1-5 | 0.5 | no route | A/C condenser fan relay | — | |
| W31 | OEM-1-G | P8-C1-43 | 0.5 | no route | A/C clutch relay | — | |
| W32 | OEM-1-U | P8-C1-42 | 0.5 | no route | Fuel pump relay (low-side) | — | |
| W33 | OEM-3-M | P8-C1-21 | 0.5 | no route | Front O2 heater control | — | |
| W34 | OEM-1-E | P8-C1-6 | 0.5 | no route | Check engine light (MIL) | — | |
| W35 | OEM-4-J | P8-C1-23 | 0.5 | no route | PRC solenoid (FPR control) | — | |
| W36 | OEM-4-O | P8-C1-4 | 0.5 | no route | EGR vent solenoid | — | |
| W37 | OEM-4-P | P8-C1-17 | 0.5 | no route | EGR vacuum solenoid | — | |
| W38 | OEM-4-Q | P8-C1-35 | 0.5 | no route | Idle air control (IAC) valve | — | |
| W39 | OEM-4-T | P8-C1-53 | 0.5 | no route | EVAP purge solenoid | — | |
| W40 | OEM-4-L | P8-C1-24 | 0.5 | no route | Tachometer output | — | |
| W41 | OEM-3-H | P8-C1-30 | 0.5 | no route | EGR boost sensor | — | |
| W42 | OEM-3-N | P8-C1-7 | 0.5 | no route | EGR boost sensor (2nd channel) | — | |
| W43 | OEM-3-C | P8-C1-12 | 0.5 | no route | Front O2 sensor input | — | |
| W44 | OEM-3-D | P8-C1-44 | 0.5 | no route | Rear O2 sensor input | — | |
| W45 | OEM-3-K | P8-C1-45 | 0.5 | no route | Intake air temp (IAT) | — | |
| W46 | OEM-1-M | P8-C1-11 | 0.5 | no route | Vehicle speed sensor (VSS) | — | |
| W47 | OEM-1-C | P8-C1-13 | 0.5 | no route | Starter input (12V while cranking) | — | |
| W48 | OEM-1-K | P8-C1-14 | 0.5 | no route | A/C pressure switch (A/C request) | — | |
| W49 | OEM-1-L | P8-C1-31 | 0.5 | no route | Clutch switch | — | |
| W50 | OEM-1-Q | P8-C1-32 | 0.5 | no route | Brake switch | — | |
| W51 | OEM-3-L | P8-C1-33 | 0.5 | no route | Idle switch (closed throttle) | — | |
| W52 | OEM-3-P | P8-C1-50 | 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 (9)
| Severity | Code | Subject | Message |
|---|---|---|---|
| warn | LOAD_UNKNOWN | P8-C1-41 | P8-C1-41 "Fuel Pump Relay" 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 | P8-C1-42 | P8-C1-42 "Cam Phase Valve/Aux Out 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 | P8-C1-43 | P8-C1-43 "Aux Out 3" drives OEM-1-G A/C clutch relay (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | P8-C1-5 | P8-C1-5 "Aux Out 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 | NET_FAMILY | OEM-4-F ↔ P8-C1-29 | OEM-4-F "CAS SGT (cam trigger)" [trigger_in] is wired to P8-C1-29 "Left Driven Wheel" [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-P ↔ P8-C1-17 | OEM-4-P "EGR vacuum solenoid" [low_side_out] is wired to P8-C1-17 "Injector 5" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-4-Q ↔ P8-C1-35 | OEM-4-Q "Idle air control (IAC) valve" [low_side_out] is wired to P8-C1-35 "Injector 6" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-4-T ↔ P8-C1-53 | OEM-4-T "EVAP purge solenoid" [low_side_out] is wired to P8-C1-53 "Injector 7" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | UNMAPPED | OEM | 1 optional OEM pins are not mapped: OEM-3-J EGR valve position sensor |
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. Not wired: - OEM-4 I: Permanent +12V (battery): DTAFast P8 has no battery-constant input; not needed - OEM-3 J: EGR valve position sensor: no free analog_0_5 on DTAFast P8
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 | DTAFast P8Pro wiring schematic | https://dtafast.co.uk/pages/ecu-wiring-diagrams | — | — | — |
| 3 | community_copy | Mellens.net: 1996 Mazda Miata wiring diagrams (FSM-derived) | http://www.mellens.net/mazda/mazda_miata_extra_manual/1996_wiring.pdf | — | — | — |