MX-5 Miata NA8 1994-97 (BP-ZE, 1.8) → AMP EFI MS3Pro Mini (auto)
MX-5 Miata NA8 1994-97 (BP-ZE, 1.8) — AMP EFI — MS3Pro Mini
Drawn by Michael Gnankou · Rev 0 · proposal · 2026-10-08
Before you start
| Status | proposal · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | none |
| Size of the job | 35 wires · 6 connectors · 2 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-1-B | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | SP-14V-1 | MS3PROMINI-A-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | OEM-2-A | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-2-B | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-2-C | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-2-D | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | SP-GND-1 | MS3PROMINI-A-22 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | MS3PROMINI-A-23 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-2-F | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-0V-1 | MS3PROMINI-A-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-2-K | MS3PROMINI-A-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-2-E | MS3PROMINI-A-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-2-G | MS3PROMINI-A-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-1-G | MS3PROMINI-A-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-1-H | MS3PROMINI-A-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-2-U | MS3PROMINI-A-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-2-V | MS3PROMINI-A-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-2-Y | MS3PROMINI-A-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-2-Z | MS3PROMINI-A-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-1-J | MS3PROMINI-A-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-1-R | MS3PROMINI-A-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-2-S | MS3PROMINI-A-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-2-T | MS3PROMINI-A-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-2-W | MS3PROMINI-A-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-1-E | MS3PROMINI-A-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-2-O | MS3PROMINI-A-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-2-M | MS3PROMINI-A-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-2-N | MS3PROMINI-A-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-2-Q | MS3PROMINI-A-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-2-P | MS3PROMINI-A-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-1-M | MS3PROMINI-A-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-1-C | MS3PROMINI-A-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-1-P | MS3PROMINI-A-35 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-1-Q | MS3PROMINI-A-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-1-V | MS3PROMINI-A-16 | 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 | MS3PROMINI-A-1 | MS3PROMINI-A-21 | open (OL) | +12 V supply must not touch sensor ground | |
| 2 | MS3PROMINI-A-1 | MS3PROMINI-A-22 | open (OL) | +12 V supply must not touch power ground | |
| 3 | MS3PROMINI-A-1 | MS3PROMINI-A-2 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 4 | MS3PROMINI-A-21 | MS3PROMINI-A-2 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 5 | MS3PROMINI-A-22 | MS3PROMINI-A-2 | open (OL) | power ground must not touch 5 V sensor reference |
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
MS3PROMINI-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 12V+ switched power in | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 10 | Injector out F | — | W16 | — | 0.5 | OEM-2-U | — | — | — |
| 11 | Injector out G | — | W17 | — | 0.5 | OEM-2-V | — | — | — |
| 12 | Injector out H | — | W18 | — | 0.5 | OEM-2-Y | — | — | — |
| 13 | Analog in 1 | — | W26 | — | 0.5 | OEM-2-O | — | — | — |
| 14 | Analog in 2 | — | W28 | — | 0.5 | OEM-2-N | — | — | — |
| 15 | Analog in 3 | — | W34 | — | 0.5 | OEM-1-Q | — | — | — |
| 16 | Analog in 4 | — | W35 | — | 0.5 | OEM-1-V | — | — | — |
| 17 | Spark out A | — | W14 | — | 0.5 | OEM-1-G | — | — | — |
| 18 | Spark out B | — | W15 | — | 0.5 | OEM-1-H | — | — | — |
| 19 | Spark out C | — | — | — | — | — | — | — | — |
| 2 | +5V VREF out | — | W11 | — | 0.5 | OEM-2-K | — | — | — |
| 20 | Spark out D | — | — | — | — | — | — | — | — |
| 21 | Sensor ground | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| 22 | Power ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 23 | Power ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 24 | CAN Low | — | — | — | — | — | — | — | — |
| 25 | CAN High | — | — | — | — | — | — | — | — |
| 26 | CLT in | — | W29 | — | 0.5 | OEM-2-Q | — | — | — |
| 27 | IAT in | — | W30 | — | 0.5 | OEM-2-P | — | — | — |
| 28 | TPS in | — | W27 | — | 0.5 | OEM-2-M | — | — | — |
| 29 | Digital switched in 1 / Flex fuel | — | W32 | — | 0.5 | OEM-1-C | — | — | — |
| 3 | PWM out 1 / Idle | — | W21 | — | 0.5 | OEM-1-R | — | — | — |
| 30 | CKP+ | — | W12 | — | 0.5 | OEM-2-E | — | — | — |
| 31 | CKP- | — | — | — | — | — | — | — | — |
| 32 | CMP+ | — | W13 | — | 0.5 | OEM-2-G | — | — | — |
| 33 | CMP- | — | — | — | — | — | — | — | — |
| 34 | Digital frequency in 1 (Hall) | — | W31 | — | 0.5 | OEM-1-M | — | — | — |
| 35 | Digital frequency in 2 (Hall) | — | W33 | — | 0.5 | OEM-1-P | — | — | — |
| 4 | Fuel pump out | — | W20 | — | 0.5 | OEM-1-J | — | — | — |
| 5 | Injector out A | — | W19 | — | 0.5 | OEM-2-Z | — | — | — |
| 6 | Injector out B | — | W22 | — | 0.5 | OEM-2-S | — | — | — |
| 7 | Injector out C | — | W23 | — | 0.5 | OEM-2-T | — | — | — |
| 8 | Injector out D | — | W24 | — | 0.5 | OEM-2-W | — | — | — |
| 9 | Injector out E | — | W25 | — | 0.5 | OEM-1-E | — | — | — |
OEM-1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Constant +12V | — | — | — | — | — | — | — | — |
| B | ECU power +14V (main relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| C | Start signal | — | W32 | — | 0.5 | MS3PROMINI-A-29 | — | — | — |
| E | Malfunction indicator lamp (MIL) | — | W25 | — | 0.5 | MS3PROMINI-A-9 | — | — | — |
| G | Ignition 1 (coils 1+4, wasted spark) | — | W14 | — | 0.5 | MS3PROMINI-A-17 | — | — | — |
| H | Ignition 2 (coils 2+3, wasted spark) | — | W15 | — | 0.5 | MS3PROMINI-A-18 | — | — | — |
| J | A/C relay | — | W20 | — | 0.5 | MS3PROMINI-A-4 | — | — | — |
| M | Vehicle speed | — | W31 | — | 0.5 | MS3PROMINI-A-34 | — | — | — |
| P | Power steering pressure switch | — | W33 | — | 0.5 | MS3PROMINI-A-35 | — | — | — |
| Q | A/C request | — | W34 | — | 0.5 | MS3PROMINI-A-15 | — | — | — |
| R | Cooling fan relay | — | W21 | — | 0.5 | MS3PROMINI-A-3 | — | — | — |
| V | Neutral/clutch switch | — | W35 | — | 0.5 | MS3PROMINI-A-16 | — | — | — |
OEM-2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Power ground | — | W3 | — | 0.85 | SP-GND-1 | — | — | — |
| B | Power ground | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| C | Power ground | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| D | Power ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| E | Crank position (CAS NE) | — | W12 | — | 0.5 | MS3PROMINI-A-30 | — | — | — |
| F | MAF ground | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| G | Cam position (CAS G) | — | W13 | — | 0.5 | MS3PROMINI-A-32 | — | — | — |
| I | Tachometer output | — | — | — | — | — | — | — | — |
| K | +5V sensor supply | — | W11 | — | 0.5 | MS3PROMINI-A-2 | — | — | — |
| M | Throttle position (TPS) | — | W27 | — | 0.5 | MS3PROMINI-A-28 | — | — | — |
| N | O2 sensor | — | W28 | — | 0.5 | MS3PROMINI-A-14 | — | — | — |
| O | Mass air flow (MAF) | — | W26 | — | 0.5 | MS3PROMINI-A-13 | — | — | — |
| P | Intake air temperature (IAT) | — | W30 | — | 0.5 | MS3PROMINI-A-27 | — | — | — |
| Q | Coolant temperature (ECT) | — | W29 | — | 0.5 | MS3PROMINI-A-26 | — | — | — |
| R | PRC solenoid (fuel pressure regulator) | — | — | — | — | — | — | — | — |
| S | Condenser fan relay | — | W22 | — | 0.5 | MS3PROMINI-A-6 | — | — | — |
| T | Fuel pump relay | — | W23 | — | 0.5 | MS3PROMINI-A-7 | — | — | — |
| U | Injector 1 | — | W16 | — | 0.5 | MS3PROMINI-A-10 | — | — | — |
| V | Injector 2 | — | W17 | — | 0.5 | MS3PROMINI-A-11 | — | — | — |
| W | ISC solenoid | — | W24 | — | 0.5 | MS3PROMINI-A-8 | — | — | — |
| X | Evap purge solenoid | — | — | — | — | — | — | — | — |
| Y | Injector 3 | — | W18 | — | 0.5 | MS3PROMINI-A-12 | — | — | — |
| Z | Injector 4 | — | W19 | — | 0.5 | MS3PROMINI-A-5 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W9 | — | 0.5 | OEM-2-F | — | — | — |
| 1 | — | — | W10 | — | 0.5 | MS3PROMINI-A-21 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-1-B | — | — | — |
| 1 | — | — | W2 | — | 0.85 | MS3PROMINI-A-1 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W3 | — | 0.85 | OEM-2-A | — | — | — |
| 1 | — | — | W4 | — | 0.85 | OEM-2-B | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-2-C | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-2-D | — | — | — |
| 1 | — | — | W7 | — | 0.85 | MS3PROMINI-A-22 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | MS3PROMINI-A-23 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-1-A | Constant +12V | power_in | — | — | — | single_source | |
| OEM-1-B | ECU power +14V (main relay) | power_in | MS3PROMINI-A-1 | 12V+ switched power in | power_in | single_source | |
| OEM-1-C | Start signal | digital_in | MS3PROMINI-A-29 | Digital switched in 1 / Flex fuel | digital_in | single_source | |
| OEM-1-E | Malfunction indicator lamp (MIL) | low_side_out | MS3PROMINI-A-9 | Injector out E | injector_out | single_source | |
| OEM-1-G | Ignition 1 (coils 1+4, wasted spark) | ignition_out | MS3PROMINI-A-17 | Spark out A | ignition_out | single_source | |
| OEM-1-H | Ignition 2 (coils 2+3, wasted spark) | ignition_out | MS3PROMINI-A-18 | Spark out B | ignition_out | single_source | |
| OEM-1-J | A/C relay | low_side_out | MS3PROMINI-A-4 | Fuel pump out | low_side_out | single_source | |
| OEM-1-M | Vehicle speed | digital_in | MS3PROMINI-A-34 | Digital frequency in 1 (Hall) | digital_in | single_source | |
| OEM-1-P | Power steering pressure switch | digital_in | MS3PROMINI-A-35 | Digital frequency in 2 (Hall) | digital_in | single_source | |
| OEM-1-Q | A/C request | digital_in | MS3PROMINI-A-15 | Analog in 3 | analog_in | single_source | |
| OEM-1-R | Cooling fan relay | low_side_out | MS3PROMINI-A-3 | PWM out 1 / Idle | low_side_out | single_source | |
| OEM-1-V | Neutral/clutch switch | digital_in | MS3PROMINI-A-16 | Analog in 4 | analog_in | single_source | |
| OEM-2-A | Power ground | ground | MS3PROMINI-A-22 + MS3PROMINI-A-23 | Power ground + Power ground | ground | single_source | |
| OEM-2-B | Power ground | ground | MS3PROMINI-A-22 + MS3PROMINI-A-23 | Power ground + Power ground | ground | single_source | |
| OEM-2-C | Power ground | ground | MS3PROMINI-A-22 + MS3PROMINI-A-23 | Power ground + Power ground | ground | single_source | |
| OEM-2-D | Power ground | ground | MS3PROMINI-A-22 + MS3PROMINI-A-23 | Power ground + Power ground | ground | single_source | |
| OEM-2-E | Crank position (CAS NE) | trigger_in | MS3PROMINI-A-30 | CKP+ | trigger_in | single_source | |
| OEM-2-F | MAF ground | sensor_ground | MS3PROMINI-A-21 | Sensor ground | sensor_ground | single_source | |
| OEM-2-G | Cam position (CAS G) | trigger_in | MS3PROMINI-A-32 | CMP+ | trigger_in | single_source | |
| OEM-2-I | Tachometer output | tacho_out | — | — | — | single_source | |
| OEM-2-K | +5V sensor supply | vref | MS3PROMINI-A-2 | +5V VREF out | vref | single_source | |
| OEM-2-M | Throttle position (TPS) | analog_in | MS3PROMINI-A-28 | TPS in | analog_in | single_source | |
| OEM-2-N | O2 sensor | lambda_nb_in | MS3PROMINI-A-14 | Analog in 2 | analog_in | single_source | |
| OEM-2-O | Mass air flow (MAF) | analog_in | MS3PROMINI-A-13 | Analog in 1 | analog_in | single_source | |
| OEM-2-P | Intake air temperature (IAT) | temp_in | MS3PROMINI-A-27 | IAT in | temp_in | single_source | |
| OEM-2-Q | Coolant temperature (ECT) | temp_in | MS3PROMINI-A-26 | CLT in | temp_in | single_source | |
| OEM-2-R | PRC solenoid (fuel pressure regulator) | low_side_out | — | — | — | single_source | |
| OEM-2-S | Condenser fan relay | low_side_out | MS3PROMINI-A-6 | Injector out B | injector_out | single_source | |
| OEM-2-T | Fuel pump relay | low_side_out | MS3PROMINI-A-7 | Injector out C | injector_out | single_source | |
| OEM-2-U | Injector 1 | injector_out | MS3PROMINI-A-10 | Injector out F | injector_out | single_source | |
| OEM-2-V | Injector 2 | injector_out | MS3PROMINI-A-11 | Injector out G | injector_out | single_source | |
| OEM-2-W | ISC solenoid | low_side_out | MS3PROMINI-A-8 | Injector out D | injector_out | single_source | |
| OEM-2-X | Evap purge solenoid | low_side_out | — | — | — | single_source | |
| OEM-2-Y | Injector 3 | injector_out | MS3PROMINI-A-12 | Injector out H | injector_out | single_source | |
| OEM-2-Z | Injector 4 | injector_out | MS3PROMINI-A-5 | Injector out A | injector_out | 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 | MS3PROMINI-A-1 | 0.85 | no route | 12V+ switched power in | — | |
| W3 | OEM-2-A | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W4 | OEM-2-B | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W5 | OEM-2-C | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W6 | OEM-2-D | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W7 | SP-GND-1 | MS3PROMINI-A-22 | 0.85 | no route | Power ground | — | |
| W8 | SP-GND-1 | MS3PROMINI-A-23 | 0.85 | no route | Power ground | — | |
| W9 | OEM-2-F | SP-0V-1 | 0.5 | no route | MAF ground | — | |
| W10 | SP-0V-1 | MS3PROMINI-A-21 | 0.5 | no route | Sensor ground | — | |
| W11 | OEM-2-K | MS3PROMINI-A-2 | 0.5 | no route | +5V sensor supply | — | |
| W12 | OEM-2-E | MS3PROMINI-A-30 | 0.5 | no route | Crank position (CAS NE) | — | |
| W13 | OEM-2-G | MS3PROMINI-A-32 | 0.5 | no route | Cam position (CAS G) | — | |
| W14 | OEM-1-G | MS3PROMINI-A-17 | 0.5 | no route | Ignition 1 (coils 1+4, wasted spark) | — | |
| W15 | OEM-1-H | MS3PROMINI-A-18 | 0.5 | no route | Ignition 2 (coils 2+3, wasted spark) | — | |
| W16 | OEM-2-U | MS3PROMINI-A-10 | 0.5 | no route | Injector 1 | — | |
| W17 | OEM-2-V | MS3PROMINI-A-11 | 0.5 | no route | Injector 2 | — | |
| W18 | OEM-2-Y | MS3PROMINI-A-12 | 0.5 | no route | Injector 3 | — | |
| W19 | OEM-2-Z | MS3PROMINI-A-5 | 0.5 | no route | Injector 4 | — | |
| W20 | OEM-1-J | MS3PROMINI-A-4 | 0.5 | no route | A/C relay | — | |
| W21 | OEM-1-R | MS3PROMINI-A-3 | 0.5 | no route | Cooling fan relay | — | |
| W22 | OEM-2-S | MS3PROMINI-A-6 | 0.5 | no route | Condenser fan relay | — | |
| W23 | OEM-2-T | MS3PROMINI-A-7 | 0.5 | no route | Fuel pump relay | — | |
| W24 | OEM-2-W | MS3PROMINI-A-8 | 0.5 | no route | ISC solenoid | — | |
| W25 | OEM-1-E | MS3PROMINI-A-9 | 0.5 | no route | Malfunction indicator lamp (MIL) | — | |
| W26 | OEM-2-O | MS3PROMINI-A-13 | 0.5 | no route | Mass air flow (MAF) | — | |
| W27 | OEM-2-M | MS3PROMINI-A-28 | 0.5 | no route | Throttle position (TPS) | — | |
| W28 | OEM-2-N | MS3PROMINI-A-14 | 0.5 | no route | O2 sensor | — | |
| W29 | OEM-2-Q | MS3PROMINI-A-26 | 0.5 | no route | Coolant temperature (ECT) | — | |
| W30 | OEM-2-P | MS3PROMINI-A-27 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W31 | OEM-1-M | MS3PROMINI-A-34 | 0.5 | no route | Vehicle speed | — | |
| W32 | OEM-1-C | MS3PROMINI-A-29 | 0.5 | no route | Start signal | — | |
| W33 | OEM-1-P | MS3PROMINI-A-35 | 0.5 | no route | Power steering pressure switch | — | |
| W34 | OEM-1-Q | MS3PROMINI-A-15 | 0.5 | no route | A/C request | — | |
| W35 | OEM-1-V | MS3PROMINI-A-16 | 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 |
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 | NET_FAMILY | OEM-1-Q ↔ MS3PROMINI-A-15 | OEM-1-Q "A/C request" [digital_in] is wired to MS3PROMINI-A-15 "Analog in 3" [analog_in]. Analog and digital on one net. A switch on an analog input works with a pull-up and a threshold; an analog sensor on a digital input loses its value. |
| warn | NET_FAMILY | OEM-1-V ↔ MS3PROMINI-A-16 | OEM-1-V "Neutral/clutch switch" [digital_in] is wired to MS3PROMINI-A-16 "Analog in 4" [analog_in]. Analog and digital on one net. A switch on an analog input works with a pull-up and a threshold; an analog sensor on a digital input loses its value. |
| info | NET_FAMILY | OEM-1-E ↔ MS3PROMINI-A-9 | OEM-1-E "Malfunction indicator lamp (MIL)" [low_side_out] is wired to MS3PROMINI-A-9 "Injector out E" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-2-S ↔ MS3PROMINI-A-6 | OEM-2-S "Condenser fan relay" [low_side_out] is wired to MS3PROMINI-A-6 "Injector out B" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-2-T ↔ MS3PROMINI-A-7 | OEM-2-T "Fuel pump relay" [low_side_out] is wired to MS3PROMINI-A-7 "Injector out C" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-2-W ↔ MS3PROMINI-A-8 | OEM-2-W "ISC solenoid" [low_side_out] is wired to MS3PROMINI-A-8 "Injector out D" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | UNMAPPED | OEM | 3 optional OEM pins are not mapped: OEM-2-I Tachometer output; OEM-2-R PRC solenoid (fuel pressure regulator); OEM-2-X Evap purge solenoid |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-1-A | Battery-constant (memory) feed of the stock ECU: the new ECU has no such input, so it is not needed. | mapping-proposal |
Notes
Auto-mapped by auto_map() from the library pin data on 2026-10-06. Review every wire against both manuals before building. Not wired: - OEM-1 A: Constant +12V: AMP EFI MS3Pro Mini has no battery-constant input; not needed - OEM-2 R: PRC solenoid (fuel pressure regulator): no free low_side/ls_hs/injector/hbridge on AMP EFI MS3Pro Mini - OEM-2 X: Evap purge solenoid: no free low_side/ls_hs/injector/hbridge on AMP EFI MS3Pro Mini - OEM-2 I: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on AMP EFI MS3Pro Mini
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | AMP EFI: MS3Pro Mini manual (fw 1.6.1) pinout & output ratings | https://cdn.shopify.com/s/files/1/0960/0014/7754/files/MS3Pro_User_Manual_Firmware_1.6.1_Mini.pdf?v=1760643335 | archive | 2026-10-05 | bed7d8ae8408 |
| 4 | vendor_doc | Link G4X MX5X install manual (NA 1.6/1.8) | https://linkecu.com/documentation/MX5X.pdf | archive | 2026-10-05 | b7f730de9f6e |