Mazda RX-7 FD 1992-2002 (13B-REW twin-turbo) → AMP EFI MS3Pro Mini (auto)
Mazda RX-7 FD 1992-2002 (13B-REW twin-turbo) — AMP EFI — MS3Pro Mini
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 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 | draft · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | none |
| Size of the job | 39 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-D-4A | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | OEM-D-4E | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-14V-1 | MS3PROMINI-A-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-A-1AF | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-A-1AJ | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-A-1L | 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-A-1AB | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-A-1X | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-C-3AB | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-C-3S | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | SP-0V-1 | MS3PROMINI-A-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-C-3A | MS3PROMINI-A-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-C-3R | MS3PROMINI-A-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-C-3U | MS3PROMINI-A-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-D-4AF | MS3PROMINI-A-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-D-4AJ | MS3PROMINI-A-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-D-4AN | MS3PROMINI-A-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-A-1Q | MS3PROMINI-A-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-A-1U | MS3PROMINI-A-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-A-1Y | MS3PROMINI-A-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-A-1AC | MS3PROMINI-A-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-A-1H | MS3PROMINI-A-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-D-4D | MS3PROMINI-A-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-D-4F | MS3PROMINI-A-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-D-4G | MS3PROMINI-A-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-D-4I | MS3PROMINI-A-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-D-4K | MS3PROMINI-A-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-D-4AH | MS3PROMINI-A-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-C-3I | MS3PROMINI-A-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-C-3D | MS3PROMINI-A-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-C-3W | MS3PROMINI-A-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-C-3T | MS3PROMINI-A-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-C-3V | MS3PROMINI-A-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-C-3H | MS3PROMINI-A-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-D-4Q | MS3PROMINI-A-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-D-4AA | MS3PROMINI-A-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-D-4S | MS3PROMINI-A-35 | 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-2 | MS3PROMINI-A-1 | open (OL) | 5 V sensor reference must not touch +12 V supply | |
| 2 | MS3PROMINI-A-21 | MS3PROMINI-A-1 | open (OL) | sensor ground must not touch +12 V supply | |
| 3 | MS3PROMINI-A-21 | MS3PROMINI-A-2 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 4 | MS3PROMINI-A-22 | MS3PROMINI-A-1 | open (OL) | power ground must not touch +12 V supply | |
| 5 | MS3PROMINI-A-22 | MS3PROMINI-A-2 | open (OL) | power ground 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
MS3PROMINI-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 12V+ switched power in | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 10 | Injector out F | — | W20 | — | 0.5 | OEM-A-1Q | — | — | — |
| 11 | Injector out G | — | W21 | — | 0.5 | OEM-A-1U | — | — | — |
| 12 | Injector out H | — | W22 | — | 0.5 | OEM-A-1Y | — | — | — |
| 13 | Analog in 1 | — | W30 | — | 0.5 | OEM-D-4AH | — | — | — |
| 14 | Analog in 2 | — | W32 | — | 0.5 | OEM-C-3D | — | — | — |
| 15 | Analog in 3 | — | W35 | — | 0.5 | OEM-C-3V | — | — | — |
| 16 | Analog in 4 | — | W36 | — | 0.5 | OEM-C-3H | — | — | — |
| 17 | Spark out A | — | W17 | — | 0.5 | OEM-D-4AF | — | — | — |
| 18 | Spark out B | — | W18 | — | 0.5 | OEM-D-4AJ | — | — | — |
| 19 | Spark out C | — | W19 | — | 0.5 | OEM-D-4AN | — | — | — |
| 2 | +5V VREF out | — | W14 | — | 0.5 | OEM-C-3A | — | — | — |
| 20 | Spark out D | — | — | — | — | — | — | — | — |
| 21 | Sensor ground | — | W13 | — | 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 | — | W33 | — | 0.5 | OEM-C-3W | — | — | — |
| 27 | IAT in | — | W34 | — | 0.5 | OEM-C-3T | — | — | — |
| 28 | TPS in | — | W31 | — | 0.5 | OEM-C-3I | — | — | — |
| 29 | Digital switched in 1 / Flex fuel | — | W38 | — | 0.5 | OEM-D-4AA | — | — | — |
| 3 | PWM out 1 / Idle | — | W25 | — | 0.5 | OEM-D-4D | — | — | — |
| 30 | CKP+ | — | W15 | — | 0.5 | OEM-C-3R | — | — | — |
| 31 | CKP- | — | — | — | — | — | — | — | — |
| 32 | CMP+ | — | W16 | — | 0.5 | OEM-C-3U | — | — | — |
| 33 | CMP- | — | — | — | — | — | — | — | — |
| 34 | Digital frequency in 1 (Hall) | — | W37 | — | 0.5 | OEM-D-4Q | — | — | — |
| 35 | Digital frequency in 2 (Hall) | — | W39 | — | 0.5 | OEM-D-4S | — | — | — |
| 4 | Fuel pump out | — | W24 | — | 0.5 | OEM-A-1H | — | — | — |
| 5 | Injector out A | — | W23 | — | 0.5 | OEM-A-1AC | — | — | — |
| 6 | Injector out B | — | W26 | — | 0.5 | OEM-D-4F | — | — | — |
| 7 | Injector out C | — | W27 | — | 0.5 | OEM-D-4G | — | — | — |
| 8 | Injector out D | — | W28 | — | 0.5 | OEM-D-4I | — | — | — |
| 9 | Injector out E | — | W29 | — | 0.5 | OEM-D-4K | — | — | — |
OEM-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1AA | OMP stepper phase B1 | — | — | — | — | — | — | — | — |
| 1AB | Sensor ground | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| 1AC | Injector 4 (rear secondary) | — | W23 | — | 0.5 | MS3PROMINI-A-5 | — | — | — |
| 1AE | OMP stepper phase A1 | — | — | — | — | — | — | — | — |
| 1AF | Power ground | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| 1AJ | Power ground | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 1C | Idle speed control (ISC) solenoid | — | — | — | — | — | — | — | — |
| 1E | Turbo charge control solenoid | — | — | — | — | — | — | — | — |
| 1G | Purge solenoid | — | — | — | — | — | — | — | — |
| 1H | Cooling fan relay (low speed) | — | W24 | — | 0.5 | MS3PROMINI-A-4 | — | — | — |
| 1I | Turbo charge relief solenoid | — | — | — | — | — | — | — | — |
| 1K | Turbo pre-control solenoid | — | — | — | — | — | — | — | — |
| 1L | Power ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 1M | Turbo control solenoid | — | — | — | — | — | — | — | — |
| 1O | Boost control solenoid | — | — | — | — | — | — | — | — |
| 1Q | Injector 1 (front primary) | — | W20 | — | 0.5 | MS3PROMINI-A-10 | — | — | — |
| 1S | OMP stepper phase B2 | — | — | — | — | — | — | — | — |
| 1U | Injector 2 (rear primary) | — | W21 | — | 0.5 | MS3PROMINI-A-11 | — | — | — |
| 1W | OMP stepper phase A2 | — | — | — | — | — | — | — | — |
| 1X | Sensor ground | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| 1Y | Injector 3 (front secondary) | — | W22 | — | 0.5 | MS3PROMINI-A-12 | — | — | — |
OEM-C
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 3A | +5V sensor supply | — | W14 | — | 0.5 | MS3PROMINI-A-2 | — | — | — |
| 3AB | Sensor ground | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| 3D | O2 sensor (narrowband) | — | W32 | — | 0.5 | MS3PROMINI-A-14 | — | — | — |
| 3G | Fuel pressure regulator control (PRC) solenoid | — | — | — | — | — | — | — | — |
| 3H | OMP position sensor | — | W36 | — | 0.5 | MS3PROMINI-A-16 | — | — | — |
| 3I | Throttle position (TPS, full range) | — | W31 | — | 0.5 | MS3PROMINI-A-28 | — | — | — |
| 3O | Knock sensor | — | — | — | — | — | — | — | — |
| 3R | Crank position (CAS NE) | — | W15 | — | 0.5 | MS3PROMINI-A-30 | — | — | — |
| 3S | Sensor ground (CAS) | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 3T | Intake air temperature (IAT) | — | W34 | — | 0.5 | MS3PROMINI-A-27 | — | — | — |
| 3U | Home position (CAS G) | — | W16 | — | 0.5 | MS3PROMINI-A-32 | — | — | — |
| 3V | Fuel temperature | — | W35 | — | 0.5 | MS3PROMINI-A-15 | — | — | — |
| 3W | Coolant temperature (ECT) | — | W33 | — | 0.5 | MS3PROMINI-A-26 | — | — | — |
OEM-D
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 4A | ECU main power (+12V via main relay/ECR) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 4AA | Brake pedal switch | — | W38 | — | 0.5 | MS3PROMINI-A-29 | — | — | — |
| 4AF | Ignition front trailing | — | W17 | — | 0.5 | MS3PROMINI-A-17 | — | — | — |
| 4AH | MAP sensor (PIM) | — | W30 | — | 0.5 | MS3PROMINI-A-13 | — | — | — |
| 4AJ | Ignition rear trailing | — | W18 | — | 0.5 | MS3PROMINI-A-18 | — | — | — |
| 4AN | Ignition leading (wasted spark) | — | W19 | — | 0.5 | MS3PROMINI-A-19 | — | — | — |
| 4B | Battery constant (+12V) | — | — | — | — | — | — | — | — |
| 4C | Ignition switch / start signal | — | — | — | — | — | — | — | — |
| 4D | Air pump clutch relay | — | W25 | — | 0.5 | MS3PROMINI-A-3 | — | — | — |
| 4E | ECU main power (+12V via main relay/ECR) | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 4F | Fuel pump speed relay | — | W26 | — | 0.5 | MS3PROMINI-A-6 | — | — | — |
| 4G | Fuel pump relay | — | W27 | — | 0.5 | MS3PROMINI-A-7 | — | — | — |
| 4I | A/C relay | — | W28 | — | 0.5 | MS3PROMINI-A-8 | — | — | — |
| 4K | Cooling fan relay (low speed) | — | W29 | — | 0.5 | MS3PROMINI-A-9 | — | — | — |
| 4L | Cooling fan relay (high speed) | — | — | — | — | — | — | — | — |
| 4M | Tachometer output | — | — | — | — | — | — | — | — |
| 4Q | Vehicle speed sensor | — | W37 | — | 0.5 | MS3PROMINI-A-34 | — | — | — |
| 4S | Clutch switch | — | W39 | — | 0.5 | MS3PROMINI-A-35 | — | — | — |
| 4V | A/C request | — | — | — | — | — | — | — | — |
| 4W | Power steering pressure switch | — | — | — | — | — | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W9 | — | 0.5 | OEM-A-1AB | — | — | — |
| 1 | — | — | W10 | — | 0.5 | OEM-A-1X | — | — | — |
| 1 | — | — | W11 | — | 0.5 | OEM-C-3AB | — | — | — |
| 1 | — | — | W12 | — | 0.5 | OEM-C-3S | — | — | — |
| 1 | — | — | W13 | — | 0.5 | MS3PROMINI-A-21 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-D-4A | — | — | — |
| 1 | — | — | W2 | — | 0.85 | OEM-D-4E | — | — | — |
| 1 | — | — | W3 | — | 0.85 | MS3PROMINI-A-1 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W4 | — | 0.85 | OEM-A-1AF | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-A-1AJ | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-A-1L | — | — | — |
| 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-A-1AA | OMP stepper phase B1 | hbridge_out | — | — | — | single_source | |
| OEM-A-1AB | Sensor ground | sensor_ground | MS3PROMINI-A-21 | Sensor ground | sensor_ground | single_source | |
| OEM-A-1AC | Injector 4 (rear secondary) | injector_out | MS3PROMINI-A-5 | Injector out A | injector_out | single_source | |
| OEM-A-1AE | OMP stepper phase A1 | hbridge_out | — | — | — | single_source | |
| OEM-A-1AF | Power ground | ground | MS3PROMINI-A-22 + MS3PROMINI-A-23 | Power ground + Power ground | ground | single_source | |
| OEM-A-1AJ | Power ground | ground | MS3PROMINI-A-22 + MS3PROMINI-A-23 | Power ground + Power ground | ground | single_source | |
| OEM-A-1C | Idle speed control (ISC) solenoid | low_side_out | — | — | — | single_source | |
| OEM-A-1E | Turbo charge control solenoid | low_side_out | — | — | — | single_source | |
| OEM-A-1G | Purge solenoid | low_side_out | — | — | — | single_source | |
| OEM-A-1H | Cooling fan relay (low speed) | low_side_out | MS3PROMINI-A-4 | Fuel pump out | low_side_out | single_source | |
| OEM-A-1I | Turbo charge relief solenoid | low_side_out | — | — | — | single_source | |
| OEM-A-1K | Turbo pre-control solenoid | low_side_out | — | — | — | single_source | |
| OEM-A-1L | Power ground | ground | MS3PROMINI-A-22 + MS3PROMINI-A-23 | Power ground + Power ground | ground | single_source | |
| OEM-A-1M | Turbo control solenoid | low_side_out | — | — | — | single_source | |
| OEM-A-1O | Boost control solenoid | low_side_out | — | — | — | single_source | |
| OEM-A-1Q | Injector 1 (front primary) | injector_out | MS3PROMINI-A-10 | Injector out F | injector_out | single_source | |
| OEM-A-1S | OMP stepper phase B2 | hbridge_out | — | — | — | single_source | |
| OEM-A-1U | Injector 2 (rear primary) | injector_out | MS3PROMINI-A-11 | Injector out G | injector_out | single_source | |
| OEM-A-1W | OMP stepper phase A2 | hbridge_out | — | — | — | single_source | |
| OEM-A-1X | Sensor ground | sensor_ground | MS3PROMINI-A-21 | Sensor ground | sensor_ground | single_source | |
| OEM-A-1Y | Injector 3 (front secondary) | injector_out | MS3PROMINI-A-12 | Injector out H | injector_out | single_source | |
| OEM-C-3A | +5V sensor supply | vref | MS3PROMINI-A-2 | +5V VREF out | vref | single_source | |
| OEM-C-3AB | Sensor ground | sensor_ground | MS3PROMINI-A-21 | Sensor ground | sensor_ground | single_source | |
| OEM-C-3D | O2 sensor (narrowband) | lambda_nb_in | MS3PROMINI-A-14 | Analog in 2 | analog_in | single_source | |
| OEM-C-3G | Fuel pressure regulator control (PRC) solenoid | low_side_out | — | — | — | single_source | |
| OEM-C-3H | OMP position sensor | analog_in | MS3PROMINI-A-16 | Analog in 4 | analog_in | single_source | |
| OEM-C-3I | Throttle position (TPS, full range) | analog_in | MS3PROMINI-A-28 | TPS in | analog_in | single_source | |
| OEM-C-3O | Knock sensor | knock_in | — | — | — | single_source | |
| OEM-C-3R | Crank position (CAS NE) | trigger_in | MS3PROMINI-A-30 | CKP+ | trigger_in | single_source | |
| OEM-C-3S | Sensor ground (CAS) | sensor_ground | MS3PROMINI-A-21 | Sensor ground | sensor_ground | single_source | |
| OEM-C-3T | Intake air temperature (IAT) | temp_in | MS3PROMINI-A-27 | IAT in | temp_in | single_source | |
| OEM-C-3U | Home position (CAS G) | trigger_in | MS3PROMINI-A-32 | CMP+ | trigger_in | single_source | |
| OEM-C-3V | Fuel temperature | temp_in | MS3PROMINI-A-15 | Analog in 3 | analog_in | single_source | |
| OEM-C-3W | Coolant temperature (ECT) | temp_in | MS3PROMINI-A-26 | CLT in | temp_in | single_source | |
| OEM-D-4A | ECU main power (+12V via main relay/ECR) | power_in | MS3PROMINI-A-1 | 12V+ switched power in | power_in | single_source | |
| OEM-D-4AA | Brake pedal switch | digital_in | MS3PROMINI-A-29 | Digital switched in 1 / Flex fuel | digital_in | single_source | |
| OEM-D-4AF | Ignition front trailing | ignition_out | MS3PROMINI-A-17 | Spark out A | ignition_out | single_source | |
| OEM-D-4AH | MAP sensor (PIM) | analog_in | MS3PROMINI-A-13 | Analog in 1 | analog_in | single_source | |
| OEM-D-4AJ | Ignition rear trailing | ignition_out | MS3PROMINI-A-18 | Spark out B | ignition_out | single_source | |
| OEM-D-4AN | Ignition leading (wasted spark) | ignition_out | MS3PROMINI-A-19 | Spark out C | ignition_out | single_source | |
| OEM-D-4B | Battery constant (+12V) | power_in | — | — | — | single_source | |
| OEM-D-4C | Ignition switch / start signal | digital_in | — | — | — | single_source | |
| OEM-D-4D | Air pump clutch relay | low_side_out | MS3PROMINI-A-3 | PWM out 1 / Idle | low_side_out | single_source | |
| OEM-D-4E | ECU main power (+12V via main relay/ECR) | power_in | MS3PROMINI-A-1 | 12V+ switched power in | power_in | single_source | |
| OEM-D-4F | Fuel pump speed relay | low_side_out | MS3PROMINI-A-6 | Injector out B | injector_out | single_source | |
| OEM-D-4G | Fuel pump relay | low_side_out | MS3PROMINI-A-7 | Injector out C | injector_out | single_source | |
| OEM-D-4I | A/C relay | low_side_out | MS3PROMINI-A-8 | Injector out D | injector_out | single_source | |
| OEM-D-4K | Cooling fan relay (low speed) | low_side_out | MS3PROMINI-A-9 | Injector out E | injector_out | single_source | |
| OEM-D-4L | Cooling fan relay (high speed) | low_side_out | — | — | — | single_source | |
| OEM-D-4M | Tachometer output | tacho_out | — | — | — | single_source | |
| OEM-D-4Q | Vehicle speed sensor | digital_in | MS3PROMINI-A-34 | Digital frequency in 1 (Hall) | digital_in | single_source | |
| OEM-D-4S | Clutch switch | digital_in | MS3PROMINI-A-35 | Digital frequency in 2 (Hall) | digital_in | single_source | |
| OEM-D-4V | A/C request | digital_in | — | — | — | single_source | |
| OEM-D-4W | Power steering pressure switch | digital_in | — | — | — | single_source |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-D-4A | SP-14V-1 | 0.85 | no route | ECU main power (+12V via main relay/ECR) | — | |
| W2 | OEM-D-4E | SP-14V-1 | 0.85 | no route | ECU main power (+12V via main relay/ECR) | — | |
| W3 | SP-14V-1 | MS3PROMINI-A-1 | 0.85 | no route | 12V+ switched power in | — | |
| W4 | OEM-A-1AF | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W5 | OEM-A-1AJ | SP-GND-1 | 0.85 | no route | Power ground | — | |
| W6 | OEM-A-1L | 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-A-1AB | SP-0V-1 | 0.5 | no route | Sensor ground | — | |
| W10 | OEM-A-1X | SP-0V-1 | 0.5 | no route | Sensor ground | — | |
| W11 | OEM-C-3AB | SP-0V-1 | 0.5 | no route | Sensor ground | — | |
| W12 | OEM-C-3S | SP-0V-1 | 0.5 | no route | Sensor ground (CAS) | — | |
| W13 | SP-0V-1 | MS3PROMINI-A-21 | 0.5 | no route | Sensor ground | — | |
| W14 | OEM-C-3A | MS3PROMINI-A-2 | 0.5 | no route | +5V sensor supply | — | |
| W15 | OEM-C-3R | MS3PROMINI-A-30 | 0.5 | no route | Crank position (CAS NE) | — | |
| W16 | OEM-C-3U | MS3PROMINI-A-32 | 0.5 | no route | Home position (CAS G) | — | |
| W17 | OEM-D-4AF | MS3PROMINI-A-17 | 0.5 | no route | Ignition front trailing | — | |
| W18 | OEM-D-4AJ | MS3PROMINI-A-18 | 0.5 | no route | Ignition rear trailing | — | |
| W19 | OEM-D-4AN | MS3PROMINI-A-19 | 0.5 | no route | Ignition leading (wasted spark) | — | |
| W20 | OEM-A-1Q | MS3PROMINI-A-10 | 0.5 | no route | Injector 1 (front primary) | — | |
| W21 | OEM-A-1U | MS3PROMINI-A-11 | 0.5 | no route | Injector 2 (rear primary) | — | |
| W22 | OEM-A-1Y | MS3PROMINI-A-12 | 0.5 | no route | Injector 3 (front secondary) | — | |
| W23 | OEM-A-1AC | MS3PROMINI-A-5 | 0.5 | no route | Injector 4 (rear secondary) | — | |
| W24 | OEM-A-1H | MS3PROMINI-A-4 | 0.5 | no route | Cooling fan relay (low speed) | — | |
| W25 | OEM-D-4D | MS3PROMINI-A-3 | 0.5 | no route | Air pump clutch relay | — | |
| W26 | OEM-D-4F | MS3PROMINI-A-6 | 0.5 | no route | Fuel pump speed relay | — | |
| W27 | OEM-D-4G | MS3PROMINI-A-7 | 0.5 | no route | Fuel pump relay | — | |
| W28 | OEM-D-4I | MS3PROMINI-A-8 | 0.5 | no route | A/C relay | — | |
| W29 | OEM-D-4K | MS3PROMINI-A-9 | 0.5 | no route | Cooling fan relay (low speed) | — | |
| W30 | OEM-D-4AH | MS3PROMINI-A-13 | 0.5 | no route | MAP sensor (PIM) | — | |
| W31 | OEM-C-3I | MS3PROMINI-A-28 | 0.5 | no route | Throttle position (TPS, full range) | — | |
| W32 | OEM-C-3D | MS3PROMINI-A-14 | 0.5 | no route | O2 sensor (narrowband) | — | |
| W33 | OEM-C-3W | MS3PROMINI-A-26 | 0.5 | no route | Coolant temperature (ECT) | — | |
| W34 | OEM-C-3T | MS3PROMINI-A-27 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W35 | OEM-C-3V | MS3PROMINI-A-15 | 0.5 | no route | Fuel temperature | — | |
| W36 | OEM-C-3H | MS3PROMINI-A-16 | 0.5 | no route | OMP position sensor | — | |
| W37 | OEM-D-4Q | MS3PROMINI-A-34 | 0.5 | no route | Vehicle speed sensor | — | |
| W38 | OEM-D-4AA | MS3PROMINI-A-29 | 0.5 | no route | Brake pedal switch | — | |
| W39 | OEM-D-4S | MS3PROMINI-A-35 | 0.5 | no route | Clutch 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 (6)
| Severity | Code | Subject | Message |
|---|---|---|---|
| info | NET_FAMILY | OEM-C-3V ↔ MS3PROMINI-A-15 | OEM-C-3V "Fuel temperature" [temp_in] is wired to MS3PROMINI-A-15 "Analog in 3" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | NET_FAMILY | OEM-D-4F ↔ MS3PROMINI-A-6 | OEM-D-4F "Fuel pump speed 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-D-4G ↔ MS3PROMINI-A-7 | OEM-D-4G "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-D-4I ↔ MS3PROMINI-A-8 | OEM-D-4I "A/C relay" [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 | NET_FAMILY | OEM-D-4K ↔ MS3PROMINI-A-9 | OEM-D-4K "Cooling fan relay (low speed)" [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 | UNMAPPED | OEM | 18 optional OEM pins are not mapped: OEM-A-1AA OMP stepper phase B1; OEM-A-1AE OMP stepper phase A1; OEM-A-1C Idle speed control (ISC) solenoid; OEM-A-1E Turbo charge control solenoid; OEM-A-1G Purge solenoid; OEM-A-1I Turbo charge relief solenoid; OEM-A-1K Turbo pre-control solenoid; OEM-A-1M Turbo control solenoid; OEM-A-1O Boost control solenoid; OEM-A-1S OMP stepper phase B2; OEM-A-1W OMP stepper phase A2; OEM-C-3G Fuel pressure regulator control (PRC) solenoid; OEM-C-3O Knock sensor; OEM-D-4C Ignition switch / start signal; OEM-D-4L Cooling fan relay (high speed); OEM-D-4M Tachometer output; OEM-D-4V A/C request; OEM-D-4W Power steering pressure switch |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-D-4B | Battery-constant (memory) feed of the stock ECU: the new ECU has no such input, so it is not needed. | mapping-proposal |
Notes
Fit check: needs add-on. Resolve these before building: - Oil metering pump stepper driver needed; not documented for this ECU - Sequential twin-turbo control needed; not documented for this ECU - No knock input; the stock knock sensor would be unused 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-D 4B: Battery constant (+12V): AMP EFI MS3Pro Mini has no battery-constant input; not needed - OEM-C 3O: Knock sensor: no free knock input on AMP EFI MS3Pro Mini - OEM-D 4C: Ignition switch / start signal: key-on 12 V sense — optional in a swap (the main relay is energized from keyed 12 V, not from this pin); AMP EFI MS3Pro Mini has no dedicated key-on input - OEM-A 1AA: OMP stepper phase B1: no free hbridge on AMP EFI MS3Pro Mini - OEM-A 1AE: OMP stepper phase A1: no free hbridge on AMP EFI MS3Pro Mini - OEM-A 1S: OMP stepper phase B2: no free hbridge on AMP EFI MS3Pro Mini - OEM-A 1W: OMP stepper phase A2: no free hbridge on AMP EFI MS3Pro Mini - OEM-D 4L: Cooling fan relay (high speed): no free relay_control/low_side/ls_hs/injector/hbridge rated ≥ 0.2 A on AMP EFI MS3Pro Mini - OEM-A 1C: Idle speed control (ISC) solenoid: no free low_side/ls_hs/injector/hbridge on AMP EFI MS3Pro Mini - OEM-A 1E: Turbo charge control solenoid: no free low_side/ls_hs/injector/hbridge on AMP EFI MS3Pro Mini - OEM-A 1G: Purge solenoid: no free low_side/ls_hs/injector/hbridge on AMP EFI MS3Pro Mini - OEM-A 1I: Turbo charge relief solenoid: no free low_side/ls_hs/injector/hbridge on AMP EFI MS3Pro Mini - OEM-A 1K: Turbo pre-control solenoid: no free low_side/ls_hs/injector/hbridge on AMP EFI MS3Pro Mini - OEM-A 1M: Turbo control solenoid: no free low_side/ls_hs/injector/hbridge on AMP EFI MS3Pro Mini - OEM-A 1O: Boost control solenoid: no free low_side/ls_hs/injector/hbridge on AMP EFI MS3Pro Mini - OEM-C 3G: Fuel pressure regulator control (PRC) solenoid: no free low_side/ls_hs/injector/hbridge on AMP EFI MS3Pro Mini - OEM-D 4M: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on AMP EFI MS3Pro Mini - OEM-D 4V: A/C request: no free switch_in/frequency_in/analog_0_5 on AMP EFI MS3Pro Mini - OEM-D 4W: Power steering pressure switch: no free switch_in/frequency_in/analog_0_5 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 | Haltech: RX7 FD Series 7-8 Nexus PnP adapter pinout (HT-186338) | https://www.haltech.com/wp-admin/admin-ajax.php?action=ht_get_file&id=681af8c0cc78f3b6860e615e&op=1 | — | — | — |
| 2 | forum | defreezemotorsport: MS3 FD3S 16-bit ECU pinout | https://defreezemotorsport.ru/doku.php?id=ms3:fd3s162 | — | — | — |