MX-5 Miata NA8 1996-97 (BP-ZE, 1.8, OBD-II) → AMP EFI MS3Pro EVO+ (auto)
MX-5 Miata NA8 1996-97 (BP-ZE, 1.8, OBD-II) — AMP EFI — MS3Pro EVO+
Drawn by Michael Gnankou · Rev 0 · proposal · 2026-10-11
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 | 60 wires · 9 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 | MS3PROEVO-A-35 | 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 | MS3PROEVO-B-3 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | MS3PROEVO-B-5 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | MS3PROEVO-B-7 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-GND-1 | MS3PROEVO-B-9 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-3-O | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-4-H | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | SP-0V-1 | MS3PROEVO-A-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | SP-0V-1 | MS3PROEVO-A-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | SP-0V-1 | MS3PROEVO-C-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | SP-0V-1 | MS3PROEVO-C-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | SP-0V-1 | MS3PROEVO-C-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | SP-0V-1 | MS3PROEVO-C-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | SP-0V-1 | MS3PROEVO-C-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-3-I | MS3PROEVO-A-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-4-E | MS3PROEVO-A-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | SP-0V-1 | MS3PROEVO-A-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-4-G | MS3PROEVO-A-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | SP-0V-1 | MS3PROEVO-A-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-4-F | MS3PROEVO-B-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | SP-0V-1 | MS3PROEVO-B-35 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-4-N | MS3PROEVO-B-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-4-R | MS3PROEVO-B-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-4-U | MS3PROEVO-A-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-4-V | MS3PROEVO-A-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-4-W | MS3PROEVO-B-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-4-X | MS3PROEVO-B-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-3-B | MS3PROEVO-A-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-3-F | MS3PROEVO-A-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-3-G | MS3PROEVO-A-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-1-A | MS3PROEVO-A-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-1-B | MS3PROEVO-A-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-1-G | MS3PROEVO-C-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-1-U | MS3PROEVO-A-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-3-M | MS3PROEVO-C-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-1-E | MS3PROEVO-A-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-4-J | MS3PROEVO-C-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-4-O | MS3PROEVO-C-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-4-P | MS3PROEVO-A-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-4-Q | MS3PROEVO-A-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-4-T | MS3PROEVO-A-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-4-L | MS3PROEVO-A-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | OEM-3-H | MS3PROEVO-A-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W49 | OEM-3-N | MS3PROEVO-A-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W50 | OEM-3-C | MS3PROEVO-A-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W51 | OEM-3-D | MS3PROEVO-A-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W52 | OEM-3-K | MS3PROEVO-A-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W53 | OEM-3-J | MS3PROEVO-A-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W54 | OEM-1-M | MS3PROEVO-B-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W55 | OEM-1-C | MS3PROEVO-A-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W56 | OEM-1-K | MS3PROEVO-B-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W57 | OEM-1-L | MS3PROEVO-B-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W58 | OEM-1-Q | MS3PROEVO-C-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W59 | OEM-3-L | MS3PROEVO-C-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W60 | OEM-3-P | MS3PROEVO-B-17 | 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 | MS3PROEVO-A-8 | MS3PROEVO-A-13 | open (OL) | 5 V sensor reference must not touch sensor ground | |
| 2 | MS3PROEVO-A-8 | MS3PROEVO-B-3 | open (OL) | 5 V sensor reference must not touch power ground | |
| 3 | MS3PROEVO-A-13 | MS3PROEVO-A-35 | open (OL) | sensor ground must not touch +12 V supply | |
| 4 | MS3PROEVO-A-8 | MS3PROEVO-A-35 | open (OL) | 5 V sensor reference must not touch +12 V supply | |
| 5 | MS3PROEVO-B-3 | MS3PROEVO-A-35 | open (OL) | power 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
MS3PROEVO-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | High current out 1 | — | W44 | — | 0.5 | OEM-4-P | — | — | — |
| 10 | MAT in | — | W52 | — | 0.5 | OEM-3-K | — | — | — |
| 11 | CLT in | — | W35 | — | 0.5 | OEM-3-G | — | — | — |
| 12 | Analog In 6 | — | — | — | — | — | — | — | — |
| 13 | Logic Ground | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 14 | PWM / Idle Out 1 | — | W37 | — | 0.5 | OEM-1-B | — | — | — |
| 15 | CKP− | — | W22 | — | 0.5 | SP-0V-1 | — | — | — |
| 16 | Ground Shield Drain | — | — | — | — | — | — | — | — |
| 17 | Analog In 7 | — | — | — | — | — | — | — | — |
| 18 | Sensor return | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 19 | Analog in 1 | — | W33 | — | 0.5 | OEM-3-B | — | — | — |
| 2 | High current out 2 | — | W45 | — | 0.5 | OEM-4-Q | — | — | — |
| 20 | Analog in 2 | — | W48 | — | 0.5 | OEM-3-H | — | — | — |
| 21 | Analog in 3 | — | W49 | — | 0.5 | OEM-3-N | — | — | — |
| 22 | Analog In 4 | — | W51 | — | 0.5 | OEM-3-D | — | — | — |
| 23 | Analog In 5 | — | W53 | — | 0.5 | OEM-3-J | — | — | — |
| 24 | Tach out | — | W47 | — | 0.5 | OEM-4-L | — | — | — |
| 25 | O2 in | — | W50 | — | 0.5 | OEM-3-C | — | — | — |
| 26 | CMP+ | — | W23 | — | 0.5 | OEM-4-G | — | — | — |
| 27 | CMP− | — | W24 | — | 0.5 | SP-0V-1 | — | — | — |
| 28 | Fuel pump relay out | — | W36 | — | 0.5 | OEM-1-A | — | — | — |
| 29 | PWM out 2 | — | W39 | — | 0.5 | OEM-1-U | — | — | — |
| 3 | Injector out J | — | W29 | — | 0.5 | OEM-4-U | — | — | — |
| 30 | PWM out 3 | — | W41 | — | 0.5 | OEM-1-E | — | — | — |
| 31 | Knock in 1 | — | — | — | — | — | — | — | — |
| 32 | Digital switched in 1 | — | W55 | — | 0.5 | OEM-1-C | — | — | — |
| 33 | CAN L | — | — | — | — | — | — | — | — |
| 34 | CAN H | — | — | — | — | — | — | — | — |
| 35 | 12V+ switched power in | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 4 | Injector out I | — | W30 | — | 0.5 | OEM-4-V | — | — | — |
| 5 | High current out 3 | — | W46 | — | 0.5 | OEM-4-T | — | — | — |
| 6 | CKP+ | — | W21 | — | 0.5 | OEM-4-E | — | — | — |
| 7 | Knock In 2 | — | — | — | — | — | — | — | — |
| 8 | 5V+ VREF out | — | W20 | — | 0.5 | OEM-3-I | — | — | — |
| 9 | TPS in | — | W34 | — | 0.5 | OEM-3-F | — | — | — |
MS3PROEVO-B
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injector out A | — | W31 | — | 0.5 | OEM-4-W | — | — | — |
| 10 | Injector out F | — | W32 | — | 0.5 | OEM-4-X | — | — | — |
| 11 | Injector out G | — | — | — | — | — | — | — | — |
| 12 | Injector out H | — | — | — | — | — | — | — | — |
| 13 | Spark out G | — | W27 | — | 0.5 | OEM-4-N | — | — | — |
| 14 | Spark out E | — | W28 | — | 0.5 | OEM-4-R | — | — | — |
| 15 | Spark out C | — | — | — | — | — | — | — | — |
| 16 | Spark out H | — | — | — | — | — | — | — | — |
| 17 | Digital frequency in 2 (Hall) | — | W60 | — | 0.5 | OEM-3-P | — | — | — |
| 18 | Ground Shield Drain | — | — | — | — | — | — | — | — |
| 19 | Digital switched 12V in | — | — | — | — | — | — | — | — |
| 2 | Injector out B | — | — | — | — | — | — | — | — |
| 20 | Digital switched in 2 | — | W56 | — | 0.5 | OEM-1-K | — | — | — |
| 21 | Digital frequency in 3 (unconditioned) | — | — | — | — | — | — | — | — |
| 22 | Digital Frequency in 3 (VR+) | — | — | — | — | — | — | — | — |
| 23 | Digital Frequency In 3 (VR−) | — | — | — | — | — | — | — | — |
| 24 | Spark out F | — | — | — | — | — | — | — | — |
| 25 | Spark out B | — | — | — | — | — | — | — | — |
| 26 | Spark out D | — | — | — | — | — | — | — | — |
| 27 | Spark out A | — | — | — | — | — | — | — | — |
| 28 | Digital frequency in 1 (unconditioned) | — | W54 | — | 0.5 | OEM-1-M | — | — | — |
| 29 | Digital switched in 3 | — | W57 | — | 0.5 | OEM-1-L | — | — | — |
| 3 | Ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 30 | Stepper IAC out 1B | — | — | — | — | — | — | — | — |
| 31 | Stepper IAC out 1A | — | — | — | — | — | — | — | — |
| 32 | Stepper IAC out 2A | — | — | — | — | — | — | — | — |
| 33 | Stepper IAC out 2B | — | — | — | — | — | — | — | — |
| 34 | Digital Frequency in 1 (VR+) | — | W25 | — | 0.5 | OEM-4-F | — | — | — |
| 35 | Digital Frequency in 1 (VR−) | — | W26 | — | 0.5 | SP-0V-1 | — | — | — |
| 4 | Injector out C | — | — | — | — | — | — | — | — |
| 5 | Ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 6 | Injector out D | — | — | — | — | — | — | — | — |
| 7 | Ground | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| 8 | Injector out E | — | — | — | — | — | — | — | — |
| 9 | Ground | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
MS3PROEVO-C
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | PWM out 5 | — | W43 | — | 0.5 | OEM-4-O | — | — | — |
| 10 | Digital switched in 5 | — | W59 | — | 0.5 | OEM-3-L | — | — | — |
| 11 | Digital switched in 4 | — | W58 | — | 0.5 | OEM-1-Q | — | — | — |
| 12 | Digital I/O 5 | — | — | — | — | — | — | — | — |
| 13 | Digital I/O 3 | — | — | — | — | — | — | — | — |
| 14 | Digital I/O 1 | — | — | — | — | — | — | — | — |
| 15 | 5V+ VREF out 2 | — | — | — | — | — | — | — | — |
| 17 | Sensor return | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 18 | Sensor return | — | W16 | — | 0.5 | SP-0V-1 | — | — | — |
| 19 | Sensor return | — | W17 | — | 0.5 | SP-0V-1 | — | — | — |
| 2 | PWM out 4 | — | W42 | — | 0.5 | OEM-4-J | — | — | — |
| 20 | Sensor return | — | W18 | — | 0.5 | SP-0V-1 | — | — | — |
| 21 | Sensor return | — | W19 | — | 0.5 | SP-0V-1 | — | — | — |
| 22 | 5V+ VREF out 1 | — | — | — | — | — | — | — | — |
| 3 | Digital out 2 | — | W40 | — | 0.5 | OEM-3-M | — | — | — |
| 4 | Digital out 1 | — | W38 | — | 0.5 | OEM-1-G | — | — | — |
| 5 | Digital I/O 4 | — | — | — | — | — | — | — | — |
| 6 | Digital I/O 2 | — | — | — | — | — | — | — | — |
| 7 | Analog in 8 | — | — | — | — | — | — | — | — |
OEM-1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A | Cooling fan relay (low-side) | — | W36 | — | 0.5 | MS3PROEVO-A-28 | — | — | — |
| B | A/C condenser fan relay | — | W37 | — | 0.5 | MS3PROEVO-A-14 | — | — | — |
| C | Starter input (12V while cranking) | — | W55 | — | 0.5 | MS3PROEVO-A-32 | — | — | — |
| E | Check engine light (MIL) | — | W41 | — | 0.5 | MS3PROEVO-A-30 | — | — | — |
| G | A/C clutch relay | — | W38 | — | 0.5 | MS3PROEVO-C-4 | — | — | — |
| K | A/C pressure switch (A/C request) | — | W56 | — | 0.5 | MS3PROEVO-B-20 | — | — | — |
| L | Clutch switch | — | W57 | — | 0.5 | MS3PROEVO-B-29 | — | — | — |
| M | Vehicle speed sensor (VSS) | — | W54 | — | 0.5 | MS3PROEVO-B-28 | — | — | — |
| Q | Brake switch | — | W58 | — | 0.5 | MS3PROEVO-C-11 | — | — | — |
| U | Fuel pump relay (low-side) | — | W39 | — | 0.5 | MS3PROEVO-A-29 | — | — | — |
OEM-3
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| B | MAF sensor input | — | W33 | — | 0.5 | MS3PROEVO-A-19 | — | — | — |
| C | Front O2 sensor input | — | W50 | — | 0.5 | MS3PROEVO-A-25 | — | — | — |
| D | Rear O2 sensor input | — | W51 | — | 0.5 | MS3PROEVO-A-22 | — | — | — |
| F | Throttle position (TPS) | — | W34 | — | 0.5 | MS3PROEVO-A-9 | — | — | — |
| G | Engine coolant temp (CLT) | — | W35 | — | 0.5 | MS3PROEVO-A-11 | — | — | — |
| H | EGR boost sensor | — | W48 | — | 0.5 | MS3PROEVO-A-20 | — | — | — |
| I | +5V sensor reference | — | W20 | — | 0.5 | MS3PROEVO-A-8 | — | — | — |
| J | EGR valve position sensor | — | W53 | — | 0.5 | MS3PROEVO-A-23 | — | — | — |
| K | Intake air temp (IAT) | — | W52 | — | 0.5 | MS3PROEVO-A-10 | — | — | — |
| L | Idle switch (closed throttle) | — | W59 | — | 0.5 | MS3PROEVO-C-10 | — | — | — |
| M | Front O2 heater control | — | W40 | — | 0.5 | MS3PROEVO-C-3 | — | — | — |
| N | EGR boost sensor (2nd channel) | — | W49 | — | 0.5 | MS3PROEVO-A-21 | — | — | — |
| O | Sensor ground | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| P | Power steering pressure switch | — | W60 | — | 0.5 | MS3PROEVO-B-17 | — | — | — |
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 | — | W21 | — | 0.5 | MS3PROEVO-A-6 | — | — | — |
| F | CAS SGT (cam trigger) | — | W25 | — | 0.5 | MS3PROEVO-B-34 | — | — | — |
| G | CAS SGC (cam sync) | — | W23 | — | 0.5 | MS3PROEVO-A-26 | — | — | — |
| H | Crank pickup timing ground (CKP gnd) | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| I | Permanent +12V (battery) | — | — | — | — | — | — | — | — |
| J | PRC solenoid (FPR control) | — | W42 | — | 0.5 | MS3PROEVO-C-2 | — | — | — |
| K | Chassis ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| L | Tachometer output | — | W47 | — | 0.5 | MS3PROEVO-A-24 | — | — | — |
| N | Ignition coil trigger (cyl 1&4) | — | W27 | — | 0.5 | MS3PROEVO-B-13 | — | — | — |
| O | EGR vent solenoid | — | W43 | — | 0.5 | MS3PROEVO-C-1 | — | — | — |
| P | EGR vacuum solenoid | — | W44 | — | 0.5 | MS3PROEVO-A-1 | — | — | — |
| Q | Idle air control (IAC) valve | — | W45 | — | 0.5 | MS3PROEVO-A-2 | — | — | — |
| R | Ignition coil trigger (cyl 2&3) | — | W28 | — | 0.5 | MS3PROEVO-B-14 | — | — | — |
| T | EVAP purge solenoid | — | W46 | — | 0.5 | MS3PROEVO-A-5 | — | — | — |
| U | Injector 1 (cyl 1) | — | W29 | — | 0.5 | MS3PROEVO-A-3 | — | — | — |
| V | Injector 2 (cyl 2) | — | W30 | — | 0.5 | MS3PROEVO-A-4 | — | — | — |
| W | Injector 3 (cyl 3) | — | W31 | — | 0.5 | MS3PROEVO-B-1 | — | — | — |
| X | Injector 4 (cyl 4) | — | W32 | — | 0.5 | MS3PROEVO-B-10 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W11 | — | 0.5 | OEM-3-O | — | — | — |
| 1 | — | — | W12 | — | 0.5 | OEM-4-H | — | — | — |
| 1 | — | — | W13 | — | 0.5 | MS3PROEVO-A-13 | — | — | — |
| 1 | — | — | W14 | — | 0.5 | MS3PROEVO-A-18 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | MS3PROEVO-C-17 | — | — | — |
| 1 | — | — | W16 | — | 0.5 | MS3PROEVO-C-18 | — | — | — |
| 1 | — | — | W17 | — | 0.5 | MS3PROEVO-C-19 | — | — | — |
| 1 | — | — | W18 | — | 0.5 | MS3PROEVO-C-20 | — | — | — |
| 1 | — | — | W19 | — | 0.5 | MS3PROEVO-C-21 | — | — | — |
| 1 | — | — | W22 | — | 0.5 | MS3PROEVO-A-15 | — | — | — |
| 1 | — | — | W24 | — | 0.5 | MS3PROEVO-A-27 | — | — | — |
| 1 | — | — | W26 | — | 0.5 | MS3PROEVO-B-35 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-4-B | — | — | — |
| 1 | — | — | W2 | — | 0.85 | MS3PROEVO-A-35 | — | — | — |
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 | MS3PROEVO-B-3 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | MS3PROEVO-B-5 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | MS3PROEVO-B-7 | — | — | — |
| 1 | — | — | W10 | — | 0.85 | MS3PROEVO-B-9 | — | — | — |
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 | MS3PROEVO-A-28 | Fuel pump relay out | low_side_out | corroborated | |
| OEM-1-B | A/C condenser fan relay | low_side_out | MS3PROEVO-A-14 | PWM / Idle Out 1 | low_side_out | corroborated | |
| OEM-1-C | Starter input (12V while cranking) | digital_in | MS3PROEVO-A-32 | Digital switched in 1 | digital_in | corroborated | |
| OEM-1-E | Check engine light (MIL) | low_side_out | MS3PROEVO-A-30 | PWM out 3 | low_side_out | corroborated | |
| OEM-1-G | A/C clutch relay | low_side_out | MS3PROEVO-C-4 | Digital out 1 | low_side_out | corroborated | |
| OEM-1-K | A/C pressure switch (A/C request) | digital_in | MS3PROEVO-B-20 | Digital switched in 2 | digital_in | corroborated | |
| OEM-1-L | Clutch switch | digital_in | MS3PROEVO-B-29 | Digital switched in 3 | digital_in | corroborated | |
| OEM-1-M | Vehicle speed sensor (VSS) | digital_in | MS3PROEVO-B-28 | Digital frequency in 1 (unconditioned) | digital_in | corroborated | |
| OEM-1-Q | Brake switch | digital_in | MS3PROEVO-C-11 | Digital switched in 4 | digital_in | corroborated | |
| OEM-1-U | Fuel pump relay (low-side) | low_side_out | MS3PROEVO-A-29 | PWM out 2 | low_side_out | corroborated | |
| OEM-3-B | MAF sensor input | analog_in | MS3PROEVO-A-19 | Analog in 1 | analog_in | corroborated | |
| OEM-3-C | Front O2 sensor input | lambda_nb_in | MS3PROEVO-A-25 | O2 in | lambda_nb_in | corroborated | |
| OEM-3-D | Rear O2 sensor input | lambda_nb_in | MS3PROEVO-A-22 | Analog In 4 | analog_in | corroborated | |
| OEM-3-F | Throttle position (TPS) | analog_in | MS3PROEVO-A-9 | TPS in | analog_in | corroborated | |
| OEM-3-G | Engine coolant temp (CLT) | temp_in | MS3PROEVO-A-11 | CLT in | temp_in | corroborated | |
| OEM-3-H | EGR boost sensor | analog_in | MS3PROEVO-A-20 | Analog in 2 | analog_in | corroborated | |
| OEM-3-I | +5V sensor reference | vref | MS3PROEVO-A-8 | 5V+ VREF out | vref | corroborated | |
| OEM-3-J | EGR valve position sensor | analog_in | MS3PROEVO-A-23 | Analog In 5 | analog_in | corroborated | |
| OEM-3-K | Intake air temp (IAT) | temp_in | MS3PROEVO-A-10 | MAT in | temp_in | corroborated | |
| OEM-3-L | Idle switch (closed throttle) | digital_in | MS3PROEVO-C-10 | Digital switched in 5 | digital_in | corroborated | |
| OEM-3-M | Front O2 heater control | low_side_out | MS3PROEVO-C-3 | Digital out 2 | low_side_out | corroborated | |
| OEM-3-N | EGR boost sensor (2nd channel) | analog_in | MS3PROEVO-A-21 | Analog in 3 | analog_in | corroborated | |
| OEM-3-O | Sensor ground | sensor_ground | MS3PROEVO-A-13 + MS3PROEVO-A-15 + MS3PROEVO-A-18 + MS3PROEVO-A-27 + MS3PROEVO-B-35 + MS3PROEVO-C-17 + MS3PROEVO-C-18 + MS3PROEVO-C-19 + MS3PROEVO-C-20 + MS3PROEVO-C-21 | Logic Ground + CKP− + Sensor return + CMP− + Digital Frequency in 1 (VR−) + Sensor return + Sensor return + Sensor return + Sensor return + Sensor return | digital_in + sensor_ground + trigger_in | corroborated | |
| OEM-3-P | Power steering pressure switch | digital_in | MS3PROEVO-B-17 | Digital frequency in 2 (Hall) | digital_in | corroborated | |
| OEM-4-A | Chassis ground | ground | MS3PROEVO-B-3 + MS3PROEVO-B-5 + MS3PROEVO-B-7 + MS3PROEVO-B-9 | Ground + Ground + Ground + Ground | ground | corroborated | |
| OEM-4-B | ECU power +12V (main relay) | power_in | MS3PROEVO-A-35 | 12V+ switched power in | power_in | corroborated | |
| OEM-4-C | Chassis ground | ground | MS3PROEVO-B-3 + MS3PROEVO-B-5 + MS3PROEVO-B-7 + MS3PROEVO-B-9 | Ground + Ground + Ground + Ground | ground | corroborated | |
| OEM-4-D | Chassis ground | ground | MS3PROEVO-B-3 + MS3PROEVO-B-5 + MS3PROEVO-B-7 + MS3PROEVO-B-9 | Ground + Ground + Ground + Ground | ground | corroborated | |
| OEM-4-E | Crank position (CKP) sensor | trigger_in | MS3PROEVO-A-6 | CKP+ | trigger_in | corroborated | |
| OEM-4-F | CAS SGT (cam trigger) | trigger_in | MS3PROEVO-B-34 | Digital Frequency in 1 (VR+) | digital_in | corroborated | |
| OEM-4-G | CAS SGC (cam sync) | trigger_in | MS3PROEVO-A-26 | CMP+ | trigger_in | corroborated | |
| OEM-4-H | Crank pickup timing ground (CKP gnd) | sensor_ground | MS3PROEVO-A-13 + MS3PROEVO-A-15 + MS3PROEVO-A-18 + MS3PROEVO-A-27 + MS3PROEVO-B-35 + MS3PROEVO-C-17 + MS3PROEVO-C-18 + MS3PROEVO-C-19 + MS3PROEVO-C-20 + MS3PROEVO-C-21 | Logic Ground + CKP− + Sensor return + CMP− + Digital Frequency in 1 (VR−) + Sensor return + Sensor return + Sensor return + Sensor return + Sensor return | digital_in + sensor_ground + trigger_in | corroborated | |
| OEM-4-I | Permanent +12V (battery) | power_in | — | — | — | corroborated | |
| OEM-4-J | PRC solenoid (FPR control) | low_side_out | MS3PROEVO-C-2 | PWM out 4 | low_side_out | corroborated | |
| OEM-4-K | Chassis ground | ground | MS3PROEVO-B-3 + MS3PROEVO-B-5 + MS3PROEVO-B-7 + MS3PROEVO-B-9 | Ground + Ground + Ground + Ground | ground | corroborated | |
| OEM-4-L | Tachometer output | tacho_out | MS3PROEVO-A-24 | Tach out | tacho_out | corroborated | |
| OEM-4-N | Ignition coil trigger (cyl 1&4) | ignition_out | MS3PROEVO-B-13 | Spark out G | ignition_out | corroborated | |
| OEM-4-O | EGR vent solenoid | low_side_out | MS3PROEVO-C-1 | PWM out 5 | low_side_out | corroborated | |
| OEM-4-P | EGR vacuum solenoid | low_side_out | MS3PROEVO-A-1 | High current out 1 | low_side_out | corroborated | |
| OEM-4-Q | Idle air control (IAC) valve | low_side_out | MS3PROEVO-A-2 | High current out 2 | low_side_out | corroborated | |
| OEM-4-R | Ignition coil trigger (cyl 2&3) | ignition_out | MS3PROEVO-B-14 | Spark out E | ignition_out | corroborated | |
| OEM-4-T | EVAP purge solenoid | low_side_out | MS3PROEVO-A-5 | High current out 3 | low_side_out | corroborated | |
| OEM-4-U | Injector 1 (cyl 1) | injector_out | MS3PROEVO-A-3 | Injector out J | injector_out | corroborated | |
| OEM-4-V | Injector 2 (cyl 2) | injector_out | MS3PROEVO-A-4 | Injector out I | injector_out | corroborated | |
| OEM-4-W | Injector 3 (cyl 3) | injector_out | MS3PROEVO-B-1 | Injector out A | injector_out | corroborated | |
| OEM-4-X | Injector 4 (cyl 4) | injector_out | MS3PROEVO-B-10 | Injector out F | 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 | MS3PROEVO-A-35 | 0.85 | no route | 12V+ switched power in | — | |
| 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 | MS3PROEVO-B-3 | 0.85 | no route | Ground | — | |
| W8 | SP-GND-1 | MS3PROEVO-B-5 | 0.85 | no route | Ground | — | |
| W9 | SP-GND-1 | MS3PROEVO-B-7 | 0.85 | no route | Ground | — | |
| W10 | SP-GND-1 | MS3PROEVO-B-9 | 0.85 | no route | Ground | — | |
| W11 | OEM-3-O | SP-0V-1 | 0.5 | no route | Sensor ground | — | |
| W12 | OEM-4-H | SP-0V-1 | 0.5 | no route | Crank pickup timing ground (CKP gnd) | — | |
| W13 | SP-0V-1 | MS3PROEVO-A-13 | 0.5 | no route | Logic Ground | — | |
| W14 | SP-0V-1 | MS3PROEVO-A-18 | 0.5 | no route | Sensor return | — | |
| W15 | SP-0V-1 | MS3PROEVO-C-17 | 0.5 | no route | Sensor return | — | |
| W16 | SP-0V-1 | MS3PROEVO-C-18 | 0.5 | no route | Sensor return | — | |
| W17 | SP-0V-1 | MS3PROEVO-C-19 | 0.5 | no route | Sensor return | — | |
| W18 | SP-0V-1 | MS3PROEVO-C-20 | 0.5 | no route | Sensor return | — | |
| W19 | SP-0V-1 | MS3PROEVO-C-21 | 0.5 | no route | Sensor return | — | |
| W20 | OEM-3-I | MS3PROEVO-A-8 | 0.5 | no route | +5V sensor reference | — | |
| W21 | OEM-4-E | MS3PROEVO-A-6 | 0.5 | no route | Crank position (CKP) sensor | — | |
| W22 | SP-0V-1 | MS3PROEVO-A-15 | 0.5 | no route | CKP− | — | |
| W23 | OEM-4-G | MS3PROEVO-A-26 | 0.5 | no route | CAS SGC (cam sync) | — | |
| W24 | SP-0V-1 | MS3PROEVO-A-27 | 0.5 | no route | CMP− | — | |
| W25 | OEM-4-F | MS3PROEVO-B-34 | 0.5 | no route | CAS SGT (cam trigger) | — | |
| W26 | SP-0V-1 | MS3PROEVO-B-35 | 0.5 | no route | Digital Frequency in 1 (VR−) | — | |
| W27 | OEM-4-N | MS3PROEVO-B-13 | 0.5 | no route | Ignition coil trigger (cyl 1&4) | — | |
| W28 | OEM-4-R | MS3PROEVO-B-14 | 0.5 | no route | Ignition coil trigger (cyl 2&3) | — | |
| W29 | OEM-4-U | MS3PROEVO-A-3 | 0.5 | no route | Injector 1 (cyl 1) | — | |
| W30 | OEM-4-V | MS3PROEVO-A-4 | 0.5 | no route | Injector 2 (cyl 2) | — | |
| W31 | OEM-4-W | MS3PROEVO-B-1 | 0.5 | no route | Injector 3 (cyl 3) | — | |
| W32 | OEM-4-X | MS3PROEVO-B-10 | 0.5 | no route | Injector 4 (cyl 4) | — | |
| W33 | OEM-3-B | MS3PROEVO-A-19 | 0.5 | no route | MAF sensor input | — | |
| W34 | OEM-3-F | MS3PROEVO-A-9 | 0.5 | no route | Throttle position (TPS) | — | |
| W35 | OEM-3-G | MS3PROEVO-A-11 | 0.5 | no route | Engine coolant temp (CLT) | — | |
| W36 | OEM-1-A | MS3PROEVO-A-28 | 0.5 | no route | Cooling fan relay (low-side) | — | |
| W37 | OEM-1-B | MS3PROEVO-A-14 | 0.5 | no route | A/C condenser fan relay | — | |
| W38 | OEM-1-G | MS3PROEVO-C-4 | 0.5 | no route | A/C clutch relay | — | |
| W39 | OEM-1-U | MS3PROEVO-A-29 | 0.5 | no route | Fuel pump relay (low-side) | — | |
| W40 | OEM-3-M | MS3PROEVO-C-3 | 0.5 | no route | Front O2 heater control | — | |
| W41 | OEM-1-E | MS3PROEVO-A-30 | 0.5 | no route | Check engine light (MIL) | — | |
| W42 | OEM-4-J | MS3PROEVO-C-2 | 0.5 | no route | PRC solenoid (FPR control) | — | |
| W43 | OEM-4-O | MS3PROEVO-C-1 | 0.5 | no route | EGR vent solenoid | — | |
| W44 | OEM-4-P | MS3PROEVO-A-1 | 0.5 | no route | EGR vacuum solenoid | — | |
| W45 | OEM-4-Q | MS3PROEVO-A-2 | 0.5 | no route | Idle air control (IAC) valve | — | |
| W46 | OEM-4-T | MS3PROEVO-A-5 | 0.5 | no route | EVAP purge solenoid | — | |
| W47 | OEM-4-L | MS3PROEVO-A-24 | 0.5 | no route | Tachometer output | — | |
| W48 | OEM-3-H | MS3PROEVO-A-20 | 0.5 | no route | EGR boost sensor | — | |
| W49 | OEM-3-N | MS3PROEVO-A-21 | 0.5 | no route | EGR boost sensor (2nd channel) | — | |
| W50 | OEM-3-C | MS3PROEVO-A-25 | 0.5 | no route | Front O2 sensor input | — | |
| W51 | OEM-3-D | MS3PROEVO-A-22 | 0.5 | no route | Rear O2 sensor input | — | |
| W52 | OEM-3-K | MS3PROEVO-A-10 | 0.5 | no route | Intake air temp (IAT) | — | |
| W53 | OEM-3-J | MS3PROEVO-A-23 | 0.5 | no route | EGR valve position sensor | — | |
| W54 | OEM-1-M | MS3PROEVO-B-28 | 0.5 | no route | Vehicle speed sensor (VSS) | — | |
| W55 | OEM-1-C | MS3PROEVO-A-32 | 0.5 | no route | Starter input (12V while cranking) | — | |
| W56 | OEM-1-K | MS3PROEVO-B-20 | 0.5 | no route | A/C pressure switch (A/C request) | — | |
| W57 | OEM-1-L | MS3PROEVO-B-29 | 0.5 | no route | Clutch switch | — | |
| W58 | OEM-1-Q | MS3PROEVO-C-11 | 0.5 | no route | Brake switch | — | |
| W59 | OEM-3-L | MS3PROEVO-C-10 | 0.5 | no route | Idle switch (closed throttle) | — | |
| W60 | OEM-3-P | MS3PROEVO-B-17 | 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 (4)
| Severity | Code | Subject | Message |
|---|---|---|---|
| warn | NET_FAMILY | MS3PROEVO-A-27 ↔ MS3PROEVO-B-35 | MS3PROEVO-A-27 "CMP−" [trigger_in] is wired to MS3PROEVO-B-35 "Digital Frequency in 1 (VR−)" [digital_in]. Hall-type cam/speed signals can use a digital input if it handles the frequency; VR signals cannot. |
| warn | NET_FAMILY | OEM-4-F ↔ MS3PROEVO-B-34 | OEM-4-F "CAS SGT (cam trigger)" [trigger_in] is wired to MS3PROEVO-B-34 "Digital Frequency in 1 (VR+)" [digital_in]. Hall-type cam/speed signals can use a digital input if it handles the frequency; VR signals cannot. |
| info | NET_FAMILY | MS3PROEVO-A-27 ↔ MS3PROEVO-C-17 | MS3PROEVO-A-27 "CMP−" [trigger_in] is wired to MS3PROEVO-C-17 "Sensor return" [sensor_ground]. Trigger return tied to sensor/trigger ground: correct for single-ended trigger inputs. |
| info | NET_FAMILY | MS3PROEVO-B-35 ↔ MS3PROEVO-C-21 | MS3PROEVO-B-35 "Digital Frequency in 1 (VR−)" [digital_in] is wired to MS3PROEVO-C-21 "Sensor return" [sensor_ground]. A digital input used as a ground/identification strap (e.g. AT/MT ID is grounded on manual cars) is compatible with a sensor ground. |
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): AMP EFI MS3Pro EVO+ has no battery-constant input; not needed - MS3PROEVO-B 19: Digital switched 12V in: not fed (the stock ECU has no ignition-sense pin); feed it from a switched-ignition source
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 | AMP EFI: MS3Pro EVO+ / EVO+ HC manual (fw 1.6.1) pinout tables | https://cdn.shopify.com/s/files/1/0960/0014/7754/files/MS3Pro_User_Manual_Firmware_1.6.1_EVO.pdf?v=1760643022 | archive | 2026-10-05 | d5dd8a31822d |
| 3 | community_copy | Mellens.net: 1996 Mazda Miata wiring diagrams (FSM-derived) | http://www.mellens.net/mazda/mazda_miata_extra_manual/1996_wiring.pdf | — | — | — |