MX-5 Miata NA8 1994-95 (BP-ZE, 1.8, OBD-I) → Emtron Shadow 8 (auto)
MX-5 Miata NA8 1994-95 (BP-ZE, 1.8, OBD-I) — Emtron — Shadow 8
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 2026-10-12
Before you start
Not confident with automotive wiring? Have a professional harness builder or tuner do it, or check your work before first power-up. A wiring mistake can damage the ECU, the engine or the car, or start a fire.
| Status | draft · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | 1: read the Findings page before cutting any wire |
| Size of the job | 43 wires · 7 connectors · 5 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-1-B | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | SP-14V-1 | SHADOW8-A-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-14V-1 | SHADOW8-B-26 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-1-A | SHADOW8-B-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-2-A | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-2-B | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | SP-GND-1 | SHADOW8-A-34 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | SHADOW8-A-9 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-2-C | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-2-D | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-2-F | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | SP-0V-1 | SHADOW8-A-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | SP-0V-1 | SHADOW8-A-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-2-K | SHADOW8-A-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-2-E | SHADOW8-A-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-2-G | SHADOW8-A-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-1-G | SHADOW8-B-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-1-H | SHADOW8-B-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-2-U | SHADOW8-B-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-2-V | SHADOW8-B-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-2-Y | SHADOW8-B-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-2-Z | SHADOW8-B-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-2-O | SHADOW8-A-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-2-M | SHADOW8-A-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-2-Q | SHADOW8-A-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-1-J | SHADOW8-B-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-1-R | SHADOW8-B-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-2-S | SHADOW8-B-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-2-T | SHADOW8-B-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-1-L | SHADOW8-B-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-2-L | SHADOW8-B-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-2-W | SHADOW8-B-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-1-E | SHADOW8-B-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-2-R | SHADOW8-B-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-2-X | SHADOW8-B-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-2-N | SHADOW8-A-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-2-P | SHADOW8-A-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-1-M | SHADOW8-A-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-1-C | SHADOW8-A-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-1-O | SHADOW8-A-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-1-P | SHADOW8-A-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-1-Q | SHADOW8-A-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-1-V | SHADOW8-A-31 | 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 | SHADOW8-A-1 | SHADOW8-A-34 | open (OL) | +12 V supply must not touch power ground | |
| 2 | SHADOW8-A-1 | SHADOW8-A-4 | open (OL) | +12 V supply must not touch sensor ground | |
| 3 | SHADOW8-B-1 | SHADOW8-A-34 | open (OL) | +12 V supply must not touch power ground | |
| 4 | SHADOW8-B-1 | SHADOW8-A-4 | open (OL) | +12 V supply must not touch sensor ground | |
| 5 | SHADOW8-A-1 | SHADOW8-A-3 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 6 | SHADOW8-A-34 | SHADOW8-A-3 | open (OL) | power ground must not touch 5 V sensor reference | |
| 7 | SHADOW8-A-4 | SHADOW8-A-3 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 8 | SHADOW8-B-1 | SHADOW8-A-3 | 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-1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Constant +12V | — | W4 | — | 0.85 | SHADOW8-B-1 | — | — | — |
| B | ECU power +14V (main relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| C | Start signal | — | W39 | — | 0.5 | SHADOW8-A-27 | — | — | — |
| D | Data link connector | — | — | — | — | — | — | — | — |
| E | Malfunction indicator lamp (MIL) | — | W33 | — | 0.5 | SHADOW8-B-17 | — | — | — |
| G | Ignition 1 (coils 1+4, wasted spark) | — | W17 | — | 0.5 | SHADOW8-B-27 | — | — | — |
| H | Ignition 2 (coils 2+3, wasted spark) | — | W18 | — | 0.5 | SHADOW8-B-28 | — | — | — |
| I | Powertrain control module (transmission) | — | — | — | — | — | — | — | — |
| J | A/C relay | — | W26 | — | 0.5 | SHADOW8-B-10 | — | — | — |
| L | Coolant fan relay | — | W30 | — | 0.5 | SHADOW8-B-14 | — | — | — |
| M | Vehicle speed | — | W38 | — | 0.5 | SHADOW8-A-26 | — | — | — |
| N | Powertrain control module (transmission) | — | — | — | — | — | — | — | — |
| O | Stop light switch | — | W40 | — | 0.5 | SHADOW8-A-28 | — | — | — |
| P | Power steering pressure switch | — | W41 | — | 0.5 | SHADOW8-A-29 | — | — | — |
| Q | A/C request | — | W42 | — | 0.5 | SHADOW8-A-30 | — | — | — |
| R | Cooling fan relay | — | W27 | — | 0.5 | SHADOW8-B-11 | — | — | — |
| S | Heater control unit | — | — | — | — | — | — | — | — |
| T | Unknown | — | — | — | — | — | — | — | — |
| U | Unknown | — | — | — | — | — | — | — | — |
| V | Neutral/clutch switch | — | W43 | — | 0.5 | SHADOW8-A-31 | — | — | — |
OEM-2
| 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 | Sensor ground (E2) | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| D | Sensor ground (E2) | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| E | Crank position (CAS NE) | — | W15 | — | 0.5 | SHADOW8-A-5 | — | — | — |
| F | MAF ground | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| G | Cam position (CAS G) | — | W16 | — | 0.5 | SHADOW8-A-6 | — | — | — |
| H | Data link connector | — | — | — | — | — | — | — | — |
| I | Tachometer output | — | — | — | — | — | — | — | — |
| J | EGR function sensor | — | — | — | — | — | — | — | — |
| K | +5V sensor supply | — | W14 | — | 0.5 | SHADOW8-A-3 | — | — | — |
| L | Rear defroster relay | — | W31 | — | 0.5 | SHADOW8-B-15 | — | — | — |
| M | Throttle position (TPS) | — | W24 | — | 0.5 | SHADOW8-A-11 | — | — | — |
| N | O2 sensor | — | W36 | — | 0.5 | SHADOW8-A-13 | — | — | — |
| O | Mass air flow (MAF) | — | W23 | — | 0.5 | SHADOW8-A-10 | — | — | — |
| P | Intake air temperature (IAT) | — | W37 | — | 0.5 | SHADOW8-A-14 | — | — | — |
| Q | Coolant temperature (ECT) | — | W25 | — | 0.5 | SHADOW8-A-12 | — | — | — |
| R | PRC solenoid (fuel pressure regulator) | — | W34 | — | 0.5 | SHADOW8-B-6 | — | — | — |
| S | Condenser fan relay | — | W28 | — | 0.5 | SHADOW8-B-12 | — | — | — |
| T | Fuel pump relay | — | W29 | — | 0.5 | SHADOW8-B-13 | — | — | — |
| U | Injector 1 | — | W19 | — | 0.5 | SHADOW8-B-2 | — | — | — |
| V | Injector 2 | — | W20 | — | 0.5 | SHADOW8-B-3 | — | — | — |
| W | ISC solenoid | — | W32 | — | 0.5 | SHADOW8-B-16 | — | — | — |
| X | Evap purge solenoid | — | W35 | — | 0.5 | SHADOW8-B-7 | — | — | — |
| Y | Injector 3 | — | W21 | — | 0.5 | SHADOW8-B-4 | — | — | — |
| Z | Injector 4 | — | W22 | — | 0.5 | SHADOW8-B-5 | — | — | — |
SHADOW8-A
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | ECU supply | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 2 | 8.0V sensor supply | — | — | — | — | — | — | — | — |
| 3 | 5.0V sensor supply | — | W14 | — | 0.5 | OEM-2-K | — | — | — |
| 4 | 0V analog reference | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 5 | Crank position sensor | — | W15 | — | 0.5 | OEM-2-E | — | — | — |
| 6 | Sync position sensor | — | W16 | — | 0.5 | OEM-2-G | — | — | — |
| 7 | Trigger ground | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 8 | Shield | — | — | — | — | — | — | — | — |
| 9 | Ground 1 | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 10 | Analog voltage 1 | — | W23 | — | 0.5 | OEM-2-O | — | — | — |
| 11 | Analog voltage 2 | — | W24 | — | 0.5 | OEM-2-M | — | — | — |
| 12 | Analog voltage 3 | — | W25 | — | 0.5 | OEM-2-Q | — | — | — |
| 13 | Analog voltage 4 | — | W36 | — | 0.5 | OEM-2-N | — | — | — |
| 14 | Analog voltage 5 | — | W37 | — | 0.5 | OEM-2-P | — | — | — |
| 15 | CAN bus 1 high | — | — | — | — | — | — | — | — |
| 16 | Knock 1 + | — | — | — | — | — | — | — | — |
| 17 | Knock 1 − | — | — | — | — | — | — | — | — |
| 18 | Analog voltage 6 | — | — | — | — | — | — | — | — |
| 19 | Analog voltage 7 (switchable 1k pull-up) | — | — | — | — | — | — | — | — |
| 20 | Analog voltage 8 (switchable 1k pull-up) | — | — | — | — | — | — | — | — |
| 21 | Analog voltage 9 (switchable 1k pull-up) | — | — | — | — | — | — | — | — |
| 22 | Analog voltage 10 (switchable 1k pull-up) | — | — | — | — | — | — | — | — |
| 23 | CAN bus 1 low | — | — | — | — | — | — | — | — |
| 24 | Knock 2 + | — | — | — | — | — | — | — | — |
| 25 | Knock 2 − | — | — | — | — | — | — | — | — |
| 26 | Digital input 1 | — | W38 | — | 0.5 | OEM-1-M | — | — | — |
| 27 | Digital input 2 | — | W39 | — | 0.5 | OEM-1-C | — | — | — |
| 28 | Digital input 3 | — | W40 | — | 0.5 | OEM-1-O | — | — | — |
| 29 | Digital input 4 | — | W41 | — | 0.5 | OEM-1-P | — | — | — |
| 30 | Digital input 5 | — | W42 | — | 0.5 | OEM-1-Q | — | — | — |
| 31 | Digital input 6 | — | W43 | — | 0.5 | OEM-1-V | — | — | — |
| 32 | CAN bus 2 high | — | — | — | — | — | — | — | — |
| 33 | CAN bus 2 low | — | — | — | — | — | — | — | — |
| 34 | Ground 2 | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
SHADOW8-B
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Battery constant (HOT) supply | — | W4 | — | 0.85 | OEM-1-A | — | — | — |
| 2 | Injector cylinder 1 | — | W19 | — | 0.5 | OEM-2-U | — | — | — |
| 3 | Injector cylinder 2 | — | W20 | — | 0.5 | OEM-2-V | — | — | — |
| 4 | Injector cylinder 3 | — | W21 | — | 0.5 | OEM-2-Y | — | — | — |
| 5 | Injector cylinder 4 | — | W22 | — | 0.5 | OEM-2-Z | — | — | — |
| 6 | Injector cylinder 5 | — | W34 | — | 0.5 | OEM-2-R | — | — | — |
| 7 | Injector cylinder 6 | — | W35 | — | 0.5 | OEM-2-X | — | — | — |
| 8 | Injector cylinder 7 | — | — | — | — | — | — | — | — |
| 9 | Injector cylinder 8 | — | — | — | — | — | — | — | — |
| 10 | Aux output 1 | — | W26 | — | 0.5 | OEM-1-J | — | — | — |
| 11 | Aux output 2 | — | W27 | — | 0.5 | OEM-1-R | — | — | — |
| 12 | Aux output 3 | — | W28 | — | 0.5 | OEM-2-S | — | — | — |
| 13 | Aux output 4 | — | W29 | — | 0.5 | OEM-2-T | — | — | — |
| 14 | Aux output 5 | — | W30 | — | 0.5 | OEM-1-L | — | — | — |
| 15 | Aux output 6 | — | W31 | — | 0.5 | OEM-2-L | — | — | — |
| 16 | Aux output 7 | — | W32 | — | 0.5 | OEM-2-W | — | — | — |
| 17 | Aux output 8 | — | W33 | — | 0.5 | OEM-1-E | — | — | — |
| 18 | Digital input 7 | — | — | — | — | — | — | — | — |
| 19 | Digital input 8 | — | — | — | — | — | — | — | — |
| 20 | Digital input 9 | — | — | — | — | — | — | — | — |
| 21 | Digital input 10 / ignition switch | — | — | — | — | — | — | — | — |
| 22 | Aux output 9 | — | — | — | — | — | — | — | — |
| 23 | Aux output 10 | — | — | — | — | — | — | — | — |
| 24 | Aux output 11 | — | — | — | — | — | — | — | — |
| 25 | Aux output 12 | — | — | — | — | — | — | — | — |
| 26 | Aux 9–12 power supply | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 27 | Ignition TTL cylinder 1 | — | W17 | — | 0.5 | OEM-1-G | — | — | — |
| 28 | Ignition TTL cylinder 2 | — | W18 | — | 0.5 | OEM-1-H | — | — | — |
| 29 | Ignition TTL cylinder 3 | — | — | — | — | — | — | — | — |
| 30 | Ignition TTL cylinder 4 | — | — | — | — | — | — | — | — |
| 31 | Ignition TTL cylinder 5 | — | — | — | — | — | — | — | — |
| 32 | Ignition TTL cylinder 6 | — | — | — | — | — | — | — | — |
| 33 | Ignition TTL cylinder 7 | — | — | — | — | — | — | — | — |
| 34 | Ignition TTL cylinder 8 | — | — | — | — | — | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W12 | — | 0.5 | SHADOW8-A-4 | — | — | — |
| 1 | — | — | W9 | — | 0.5 | OEM-2-C | — | — | — |
| 1 | — | — | W10 | — | 0.5 | OEM-2-D | — | — | — |
| 1 | — | — | W11 | — | 0.5 | OEM-2-F | — | — | — |
| 1 | — | — | W13 | — | 0.5 | SHADOW8-A-7 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-1-B | — | — | — |
| 1 | — | — | W2 | — | 0.85 | SHADOW8-A-1 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | SHADOW8-B-26 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W5 | — | 0.85 | OEM-2-A | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-2-B | — | — | — |
| 1 | — | — | W7 | — | 0.85 | SHADOW8-A-34 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | SHADOW8-A-9 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-1-A | Constant +12V | power_in | SHADOW8-B-1 | Battery constant (HOT) supply | power_in | LR | single_source |
| OEM-1-B | ECU power +14V (main relay) | power_in | SHADOW8-A-1 + SHADOW8-B-26 | ECU supply + Aux 9–12 power supply | power_in | WR | single_source |
| OEM-1-C | Start signal | digital_in | SHADOW8-A-27 | Digital input 2 | digital_in | V | single_source |
| OEM-1-D | Data link connector | serial | — | — | — | WG | single_source |
| OEM-1-E | Malfunction indicator lamp (MIL) | low_side_out | SHADOW8-B-17 | Aux output 8 | switch_out | YB | single_source |
| OEM-1-G | Ignition 1 (coils 1+4, wasted spark) | ignition_out | SHADOW8-B-27 | Ignition TTL cylinder 1 | ignition_out | BrY | single_source |
| OEM-1-H | Ignition 2 (coils 2+3, wasted spark) | ignition_out | SHADOW8-B-28 | Ignition TTL cylinder 2 | ignition_out | Br | single_source |
| OEM-1-I | Powertrain control module (transmission) | — | — | — | — | LW | single_source |
| OEM-1-J | A/C relay | low_side_out | SHADOW8-B-10 | Aux output 1 | low_side_out | single_source | |
| OEM-1-L | Coolant fan relay | low_side_out | SHADOW8-B-14 | Aux output 5 | switch_out | BG | single_source |
| OEM-1-M | Vehicle speed | digital_in | SHADOW8-A-26 | Digital input 1 | digital_in | GR | single_source |
| OEM-1-N | Powertrain control module (transmission) | — | — | — | — | R | single_source |
| OEM-1-O | Stop light switch | digital_in | SHADOW8-A-28 | Digital input 3 | digital_in | GB | single_source |
| OEM-1-P | Power steering pressure switch | digital_in | SHADOW8-A-29 | Digital input 4 | digital_in | LY | single_source |
| OEM-1-Q | A/C request | digital_in | SHADOW8-A-30 | Digital input 5 | digital_in | LgB | single_source |
| OEM-1-R | Cooling fan relay | low_side_out | SHADOW8-B-11 | Aux output 2 | low_side_out | YB | single_source |
| OEM-1-S | Heater control unit | — | — | — | — | LOr | single_source |
| OEM-1-T | Unknown | — | — | — | — | YR | single_source |
| OEM-1-U | Unknown | — | — | — | — | RB | single_source |
| OEM-1-V | Neutral/clutch switch | digital_in | SHADOW8-A-31 | Digital input 6 | digital_in | BrW | single_source |
| OEM-2-A | Power ground | ground | SHADOW8-A-34 + SHADOW8-A-9 | Ground 2 + Ground 1 | ground | B | single_source |
| OEM-2-B | Power ground | ground | SHADOW8-A-34 + SHADOW8-A-9 | Ground 2 + Ground 1 | ground | B | single_source |
| OEM-2-C | Sensor ground (E2) | sensor_ground | SHADOW8-A-4 + SHADOW8-A-7 | 0V analog reference + Trigger ground | sensor_ground | BLg | corroborated |
| OEM-2-D | Sensor ground (E2) | sensor_ground | SHADOW8-A-4 + SHADOW8-A-7 | 0V analog reference + Trigger ground | sensor_ground | BL | corroborated |
| OEM-2-E | Crank position (CAS NE) | trigger_in | SHADOW8-A-5 | Crank position sensor | trigger_in | W | single_source |
| OEM-2-F | MAF ground | sensor_ground | SHADOW8-A-4 + SHADOW8-A-7 | 0V analog reference + Trigger ground | sensor_ground | BR | single_source |
| OEM-2-G | Cam position (CAS G) | trigger_in | SHADOW8-A-6 | Sync position sensor | trigger_in | YL | single_source |
| OEM-2-H | Data link connector | serial | — | — | — | LgY | single_source |
| OEM-2-I | Tachometer output | tacho_out | — | — | — | BW | single_source |
| OEM-2-J | EGR function sensor | — | — | — | — | LgR | single_source |
| OEM-2-K | +5V sensor supply | vref | SHADOW8-A-3 | 5.0V sensor supply | vref | LgW | single_source |
| OEM-2-L | Rear defroster relay | low_side_out | SHADOW8-B-15 | Aux output 6 | switch_out | LR | single_source |
| OEM-2-M | Throttle position (TPS) | analog_in | SHADOW8-A-11 | Analog voltage 2 | analog_in | RB | single_source |
| OEM-2-N | O2 sensor | lambda_nb_in | SHADOW8-A-13 | Analog voltage 4 | analog_in | RL | single_source |
| OEM-2-O | Mass air flow (MAF) | analog_in | SHADOW8-A-10 | Analog voltage 1 | analog_in | R | single_source |
| OEM-2-P | Intake air temperature (IAT) | temp_in | SHADOW8-A-14 | Analog voltage 5 | analog_in | RB | single_source |
| OEM-2-Q | Coolant temperature (ECT) | temp_in | SHADOW8-A-12 | Analog voltage 3 | analog_in | LW | single_source |
| OEM-2-R | PRC solenoid (fuel pressure regulator) | low_side_out | SHADOW8-B-6 | Injector cylinder 5 | injector_out | YG | single_source |
| OEM-2-S | Condenser fan relay | low_side_out | SHADOW8-B-12 | Aux output 3 | low_side_out | LW | single_source |
| OEM-2-T | Fuel pump relay | low_side_out | SHADOW8-B-13 | Aux output 4 | low_side_out | Lg | single_source |
| OEM-2-U | Injector 1 | injector_out | SHADOW8-B-2 | Injector cylinder 1 | injector_out | Y | single_source |
| OEM-2-V | Injector 2 | injector_out | SHADOW8-B-3 | Injector cylinder 2 | injector_out | YB | single_source |
| OEM-2-W | ISC solenoid | low_side_out | SHADOW8-B-16 | Aux output 7 | switch_out | LOr | single_source |
| OEM-2-X | Evap purge solenoid | low_side_out | SHADOW8-B-7 | Injector cylinder 6 | injector_out | YR | single_source |
| OEM-2-Y | Injector 3 | injector_out | SHADOW8-B-4 | Injector cylinder 3 | injector_out | GW | single_source |
| OEM-2-Z | Injector 4 | injector_out | SHADOW8-B-5 | Injector cylinder 4 | injector_out | G | single_source |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-1-B | SP-14V-1 | 0.85 | no route | ECU power +14V (main relay) | — | |
| W2 | SP-14V-1 | SHADOW8-A-1 | 0.85 | no route | ECU supply | — | |
| W3 | SP-14V-1 | SHADOW8-B-26 | 0.85 | no route | Aux 9–12 power supply | — | |
| W4 | OEM-1-A | SHADOW8-B-1 | 0.85 | no route | Constant +12V | — | |
| W5 | OEM-2-A | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W6 | OEM-2-B | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W7 | SP-GND-1 | SHADOW8-A-34 | 0.85 | no route | Ground 2 | — | |
| W8 | SP-GND-1 | SHADOW8-A-9 | 0.85 | no route | Ground 1 | — | |
| W9 | OEM-2-C | SP-0V-1 | 0.5 | no route | Sensor ground (E2) | — | |
| W10 | OEM-2-D | SP-0V-1 | 0.5 | no route | Sensor ground (E2) | — | |
| W11 | OEM-2-F | SP-0V-1 | 0.5 | no route | MAF ground | — | |
| W12 | SP-0V-1 | SHADOW8-A-4 | 0.5 | no route | 0V analog reference | — | |
| W13 | SP-0V-1 | SHADOW8-A-7 | 0.5 | no route | Trigger ground | — | |
| W14 | OEM-2-K | SHADOW8-A-3 | 0.5 | no route | +5V sensor supply | — | |
| W15 | OEM-2-E | SHADOW8-A-5 | 0.5 | no route | Crank position (CAS NE) | — | |
| W16 | OEM-2-G | SHADOW8-A-6 | 0.5 | no route | Cam position (CAS G) | — | |
| W17 | OEM-1-G | SHADOW8-B-27 | 0.5 | no route | Ignition 1 (coils 1+4, wasted spark) | — | |
| W18 | OEM-1-H | SHADOW8-B-28 | 0.5 | no route | Ignition 2 (coils 2+3, wasted spark) | — | |
| W19 | OEM-2-U | SHADOW8-B-2 | 0.5 | no route | Injector 1 | — | |
| W20 | OEM-2-V | SHADOW8-B-3 | 0.5 | no route | Injector 2 | — | |
| W21 | OEM-2-Y | SHADOW8-B-4 | 0.5 | no route | Injector 3 | — | |
| W22 | OEM-2-Z | SHADOW8-B-5 | 0.5 | no route | Injector 4 | — | |
| W23 | OEM-2-O | SHADOW8-A-10 | 0.5 | no route | Mass air flow (MAF) | — | |
| W24 | OEM-2-M | SHADOW8-A-11 | 0.5 | no route | Throttle position (TPS) | — | |
| W25 | OEM-2-Q | SHADOW8-A-12 | 0.5 | no route | Coolant temperature (ECT) | — | |
| W26 | OEM-1-J | SHADOW8-B-10 | 0.5 | no route | A/C relay | — | |
| W27 | OEM-1-R | SHADOW8-B-11 | 0.5 | no route | Cooling fan relay | — | |
| W28 | OEM-2-S | SHADOW8-B-12 | 0.5 | no route | Condenser fan relay | — | |
| W29 | OEM-2-T | SHADOW8-B-13 | 0.5 | no route | Fuel pump relay | — | |
| W30 | OEM-1-L | SHADOW8-B-14 | 0.5 | no route | Coolant fan relay | — | |
| W31 | OEM-2-L | SHADOW8-B-15 | 0.5 | no route | Rear defroster relay | — | |
| W32 | OEM-2-W | SHADOW8-B-16 | 0.5 | no route | ISC solenoid | — | |
| W33 | OEM-1-E | SHADOW8-B-17 | 0.5 | no route | Malfunction indicator lamp (MIL) | — | |
| W34 | OEM-2-R | SHADOW8-B-6 | 0.5 | no route | PRC solenoid (fuel pressure regulator) | — | |
| W35 | OEM-2-X | SHADOW8-B-7 | 0.5 | no route | Evap purge solenoid | — | |
| W36 | OEM-2-N | SHADOW8-A-13 | 0.5 | no route | O2 sensor | — | |
| W37 | OEM-2-P | SHADOW8-A-14 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W38 | OEM-1-M | SHADOW8-A-26 | 0.5 | no route | Vehicle speed | — | |
| W39 | OEM-1-C | SHADOW8-A-27 | 0.5 | no route | Start signal | — | |
| W40 | OEM-1-O | SHADOW8-A-28 | 0.5 | no route | Stop light switch | — | |
| W41 | OEM-1-P | SHADOW8-A-29 | 0.5 | no route | Power steering pressure switch | — | |
| W42 | OEM-1-Q | SHADOW8-A-30 | 0.5 | no route | A/C request | — | |
| W43 | OEM-1-V | SHADOW8-A-31 | 0.5 | no route | Neutral/clutch switch | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|---|---|---|---|---|
| connector | 174515-6 | TE | AMP Multilock .040/.070 hybrid 22-pin female harness plug (Miata NA/NB ECU) | 1.000 | ea |
| connector | 174516-6 | TE | AMP Multilock .040/.070 hybrid 26-pin female harness plug (Miata NA/NB ECU) | 1.000 | ea |
| connector | 4-1437290-0 | TE | Superseal 1.0 34-way plug, Key 1 | 1.000 | ea |
| connector | 4-1437290-1 | TE | Superseal 1.0 34-way plug, Key 2 | 1.000 | ea |
| terminal | 3-1447221-4 | TE | Superseal 1.0 socket terminal, 20 AWG (0.5 sq mm) | 37.000 | ea |
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| No configured channels. | |||||||
Findings
Open (10)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | PHYS_REQUIRED_OPEN | SHADOW8-B-21 | SHADOW8-B-21 "Digital input 10 / ignition switch" is required but not wired. |
| info | NET_FAMILY | OEM-1-E ↔ SHADOW8-B-17 | OEM-1-E "Malfunction indicator lamp (MIL)" [low_side_out] is wired to SHADOW8-B-17 "Aux output 8" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-1-L ↔ SHADOW8-B-14 | OEM-1-L "Coolant fan relay" [low_side_out] is wired to SHADOW8-B-14 "Aux output 5" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-2-L ↔ SHADOW8-B-15 | OEM-2-L "Rear defroster relay" [low_side_out] is wired to SHADOW8-B-15 "Aux output 6" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-2-P ↔ SHADOW8-A-14 | OEM-2-P "Intake air temperature (IAT)" [temp_in] is wired to SHADOW8-A-14 "Analog voltage 5" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | NET_FAMILY | OEM-2-Q ↔ SHADOW8-A-12 | OEM-2-Q "Coolant temperature (ECT)" [temp_in] is wired to SHADOW8-A-12 "Analog voltage 3" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | NET_FAMILY | OEM-2-R ↔ SHADOW8-B-6 | OEM-2-R "PRC solenoid (fuel pressure regulator)" [low_side_out] is wired to SHADOW8-B-6 "Injector cylinder 5" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-2-W ↔ SHADOW8-B-16 | OEM-2-W "ISC solenoid" [low_side_out] is wired to SHADOW8-B-16 "Aux output 7" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-2-X ↔ SHADOW8-B-7 | OEM-2-X "Evap purge solenoid" [low_side_out] is wired to SHADOW8-B-7 "Injector cylinder 6" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | UNMAPPED | OEM | 9 optional OEM pins are not mapped: OEM-1-D Data link connector; OEM-1-I Powertrain control module (transmission); OEM-1-N Powertrain control module (transmission); OEM-1-S Heater control unit; OEM-1-T Unknown; OEM-1-U Unknown; OEM-2-H Data link connector; OEM-2-I Tachometer output; OEM-2-J EGR function sensor |
Accepted (0)
| Code | Subject | Reason | By |
|---|
Notes
Auto-mapped by auto_map() from the library pin data on 2026-10-11. Review every wire against both manuals before building. Open items: - SHADOW8-B 21: Digital input 10 / ignition switch: required by Emtron Shadow 8 but no stock pin feeds it; wire by hand Not wired: - OEM-2 I: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on Emtron Shadow 8 - OEM-1 D: Data link connector: no free k_line on Emtron Shadow 8 - OEM-2 H: Data link connector: no free k_line on Emtron Shadow 8 - OEM-1 I: Powertrain control module (transmission): not classified in the library; wire by hand - OEM-1 N: Powertrain control module (transmission): not classified in the library; wire by hand - OEM-1 S: Heater control unit: not classified in the library; wire by hand - OEM-1 T: Unknown: not classified in the library; wire by hand - OEM-1 U: Unknown: not classified in the library; wire by hand - OEM-2 J: EGR function sensor: not classified in the library; wire by hand
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | Emtron Shadow 8 ECU datasheet | https://docs.emtronaustralia.com.au/engine-management/datasheets/shadow-8-datasheet/index.html | archive | 2026-10-05 | f004c9a8d60c |
| 4 | vendor_doc | Emtron Shadow 8 pinout | https://docs.emtronaustralia.com.au/engine-management/wiring/shadow-8/shadow-8-pinout/index.html | archive | 2026-10-05 | f510053951c7 |
| 4 | vendor_doc | Link G4X MX5X install manual (NA 1.6/1.8) | https://linkecu.com/documentation/MX5X.pdf | archive | 2026-10-05 | b7f730de9f6e |
| 2 | expert_report | Justin Barrera — Miata NA/NB wiring corrections | — | — | — | — |
| 2 | community_copy | rusefi wiki: 1994 Mazda Miata 1.8 (NA8) ECU pinout | https://github.com/rusefi/rusefi/wiki/Mazda-Miata-1994 | — | 2026-10-08 | 075801b907f4 |