VW Corrado VR6 12v (AAA) Motronic M2.9 OBD1 → AMP EFI MS3Pro Mini (auto)
VW Corrado VR6 12v (AAA) Motronic M2.9 OBD1 — AMP EFI — MS3Pro Mini
⚠ 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 | 2: read the Findings page before cutting any wire |
| Size of the job | 38 wires · 5 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-A-23 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | SP-14V-1 | MS3PROMINI-A-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | OEM-A-1 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-A-10 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-A-55 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-A-56 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-A-7 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | MS3PROMINI-A-22 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | MS3PROMINI-A-23 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-A-16 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-A-33 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-A-67 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | SP-0V-1 | MS3PROMINI-A-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-A-41 | MS3PROMINI-A-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-A-68 | MS3PROMINI-A-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-A-44 | MS3PROMINI-A-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-A-8 | MS3PROMINI-A-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-A-60 | MS3PROMINI-A-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-A-52 | MS3PROMINI-A-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-A-24 | MS3PROMINI-A-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-A-3 | MS3PROMINI-A-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-A-26 | MS3PROMINI-A-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-A-4 | MS3PROMINI-A-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-A-25 | MS3PROMINI-A-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-A-2 | MS3PROMINI-A-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-A-17 | MS3PROMINI-A-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-A-40 | MS3PROMINI-A-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-A-14 | MS3PROMINI-A-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-A-49 | MS3PROMINI-A-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-A-6 | MS3PROMINI-A-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-A-9 | MS3PROMINI-A-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-A-27 | MS3PROMINI-A-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-A-20 | MS3PROMINI-A-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-A-15 | MS3PROMINI-A-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-A-36 | MS3PROMINI-A-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-A-65 | MS3PROMINI-A-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-A-37 | MS3PROMINI-A-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-A-39 | 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-1 | MS3PROMINI-A-2 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 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 | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 10 | Injector out F | — | W20 | — | 0.5 | OEM-A-24 | — | — | — |
| 11 | Injector out G | — | W21 | — | 0.5 | OEM-A-3 | — | — | — |
| 12 | Injector out H | — | W22 | — | 0.5 | OEM-A-26 | — | — | — |
| 13 | Analog in 1 | — | W26 | — | 0.5 | OEM-A-17 | — | — | — |
| 14 | Analog in 2 | — | W33 | — | 0.5 | OEM-A-20 | — | — | — |
| 15 | Analog in 3 | — | W35 | — | 0.5 | OEM-A-36 | — | — | — |
| 16 | Analog in 4 | — | — | — | — | — | — | — | — |
| 17 | Spark out A | — | W17 | — | 0.5 | OEM-A-8 | — | — | — |
| 18 | Spark out B | — | W18 | — | 0.5 | OEM-A-60 | — | — | — |
| 19 | Spark out C | — | W19 | — | 0.5 | OEM-A-52 | — | — | — |
| 2 | +5V VREF out | — | W14 | — | 0.5 | OEM-A-41 | — | — | — |
| 20 | Spark out D | — | — | — | — | — | — | — | — |
| 21 | Sensor ground | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 22 | Power ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 23 | Power ground | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| 24 | CAN Low | — | — | — | — | — | — | — | — |
| 25 | CAN High | — | — | — | — | — | — | — | — |
| 26 | CLT in | — | W28 | — | 0.5 | OEM-A-14 | — | — | — |
| 27 | IAT in | — | W34 | — | 0.5 | OEM-A-15 | — | — | — |
| 28 | TPS in | — | W27 | — | 0.5 | OEM-A-40 | — | — | — |
| 29 | Digital switched in 1 / Flex fuel | — | W37 | — | 0.5 | OEM-A-37 | — | — | — |
| 3 | PWM out 1 / Idle | — | W30 | — | 0.5 | OEM-A-6 | — | — | — |
| 30 | CKP+ | — | W15 | — | 0.5 | OEM-A-68 | — | — | — |
| 31 | CKP- | — | — | — | — | — | — | — | — |
| 32 | CMP+ | — | W16 | — | 0.5 | OEM-A-44 | — | — | — |
| 33 | CMP- | — | — | — | — | — | — | — | — |
| 34 | Digital frequency in 1 (Hall) | — | W36 | — | 0.5 | OEM-A-65 | — | — | — |
| 35 | Digital frequency in 2 (Hall) | — | W38 | — | 0.5 | OEM-A-39 | — | — | — |
| 4 | Fuel pump out | — | W29 | — | 0.5 | OEM-A-49 | — | — | — |
| 5 | Injector out A | — | W23 | — | 0.5 | OEM-A-4 | — | — | — |
| 6 | Injector out B | — | W24 | — | 0.5 | OEM-A-25 | — | — | — |
| 7 | Injector out C | — | W25 | — | 0.5 | OEM-A-2 | — | — | — |
| 8 | Injector out D | — | W31 | — | 0.5 | OEM-A-9 | — | — | — |
| 9 | Injector out E | — | W32 | — | 0.5 | OEM-A-27 | — | — | — |
OEM-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Ground (E-1) | — | W3 | — | 0.85 | SP-GND-1 | — | — | — |
| 10 | Ground (OBD1 EGR enable) | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| 14 | Coolant temperature (CLT) | — | W28 | — | 0.5 | MS3PROMINI-A-26 | — | — | — |
| 15 | EGR temperature sensor | — | W34 | — | 0.5 | MS3PROMINI-A-27 | — | — | — |
| 16 | MAF ground | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| 17 | MAF signal | — | W26 | — | 0.5 | MS3PROMINI-A-13 | — | — | — |
| 2 | Injector 6 (cyl 6) | — | W25 | — | 0.5 | MS3PROMINI-A-7 | — | — | — |
| 20 | O2 sensor 1 (primary) | — | W33 | — | 0.5 | MS3PROMINI-A-14 | — | — | — |
| 21 | Diagnostic L-line | — | — | — | — | — | — | — | — |
| 22 | Tachometer output | — | — | — | — | — | — | — | — |
| 23 | ECU main power (from engine-electronics relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 24 | Injector 1 (cyl 1) | — | W20 | — | 0.5 | MS3PROMINI-A-10 | — | — | — |
| 25 | Injector 5 (cyl 5) | — | W24 | — | 0.5 | MS3PROMINI-A-6 | — | — | — |
| 26 | Injector 3 (cyl 3) | — | W22 | — | 0.5 | MS3PROMINI-A-12 | — | — | — |
| 27 | Idle air control valve | — | W32 | — | 0.5 | MS3PROMINI-A-9 | — | — | — |
| 3 | Injector 2 (cyl 2) | — | W21 | — | 0.5 | MS3PROMINI-A-11 | — | — | — |
| 31 | EVAP canister purge valve | — | — | — | — | — | — | — | — |
| 33 | Sensor ground bus | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| 34 | Knock sensor 1 | — | — | — | — | — | — | — | — |
| 36 | Intake air temperature (IAT) | — | W35 | — | 0.5 | MS3PROMINI-A-15 | — | — | — |
| 37 | A/C compressor switch | — | W37 | — | 0.5 | MS3PROMINI-A-29 | — | — | — |
| 38 | Ignition switch (run/start) | — | — | — | — | — | — | — | — |
| 39 | A/C switch (cabin) | — | W38 | — | 0.5 | MS3PROMINI-A-35 | — | — | — |
| 4 | Injector 4 (cyl 4) | — | W23 | — | 0.5 | MS3PROMINI-A-5 | — | — | — |
| 40 | Throttle position sensor 1 | — | W27 | — | 0.5 | MS3PROMINI-A-28 | — | — | — |
| 41 | TPS power (+5V) | — | W14 | — | 0.5 | MS3PROMINI-A-2 | — | — | — |
| 43 | Diagnostic K-line | — | — | — | — | — | — | — | — |
| 44 | Camshaft position sensor (G40) | — | W16 | — | 0.5 | MS3PROMINI-A-32 | — | — | — |
| 49 | Secondary air injection relay control | — | W29 | — | 0.5 | MS3PROMINI-A-4 | — | — | — |
| 5 | Check engine light (MIL) | — | — | — | — | — | — | — | — |
| 51 | MFA fuel-consumption signal | — | — | — | — | — | — | — | — |
| 52 | Ignition coil 4 (coil pack pin 4) | — | W19 | — | 0.5 | MS3PROMINI-A-19 | — | — | — |
| 53 | Idle air control valve (2nd) | — | — | — | — | — | — | — | — |
| 54 | Battery constant (+12V) | — | — | — | — | — | — | — | — |
| 55 | Ground (E-3) | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 56 | Ground (E-4) | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 59 | Mass airflow sensor (5th terminal) | — | — | — | — | — | — | — | — |
| 6 | Fuel pump relay control | — | W30 | — | 0.5 | MS3PROMINI-A-3 | — | — | — |
| 60 | Ignition coil 3 (coil pack pin 3) | — | W18 | — | 0.5 | MS3PROMINI-A-18 | — | — | — |
| 65 | Vehicle speed sensor (VSS) | — | W36 | — | 0.5 | MS3PROMINI-A-34 | — | — | — |
| 67 | Crank sensor return (VR-) | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 68 | Crank position sensor (G28, VR+) | — | W15 | — | 0.5 | MS3PROMINI-A-30 | — | — | — |
| 7 | Ground (E-2) | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 8 | Ignition coil 2 (coil pack pin 2) | — | W17 | — | 0.5 | MS3PROMINI-A-17 | — | — | — |
| 9 | Engine electronics relay control | — | W31 | — | 0.5 | MS3PROMINI-A-8 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W10 | — | 0.5 | OEM-A-16 | — | — | — |
| 1 | — | — | W11 | — | 0.5 | OEM-A-33 | — | — | — |
| 1 | — | — | W12 | — | 0.5 | OEM-A-67 | — | — | — |
| 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-A-23 | — | — | — |
| 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-A-1 | — | — | — |
| 1 | — | — | W4 | — | 0.85 | OEM-A-10 | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-A-55 | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-A-56 | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-A-7 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | MS3PROMINI-A-22 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | MS3PROMINI-A-23 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-A-1 | Ground (E-1) | ground | MS3PROMINI-A-22 + MS3PROMINI-A-23 | Power ground + Power ground | ground | single_source | |
| OEM-A-10 | Ground (OBD1 EGR enable) | ground | MS3PROMINI-A-22 + MS3PROMINI-A-23 | Power ground + Power ground | ground | single_source | |
| OEM-A-14 | Coolant temperature (CLT) | temp_in | MS3PROMINI-A-26 | CLT in | temp_in | single_source | |
| OEM-A-15 | EGR temperature sensor | temp_in | MS3PROMINI-A-27 | IAT in | temp_in | single_source | |
| OEM-A-16 | MAF ground | sensor_ground | MS3PROMINI-A-21 | Sensor ground | sensor_ground | single_source | |
| OEM-A-17 | MAF signal | analog_in | MS3PROMINI-A-13 | Analog in 1 | analog_in | single_source | |
| OEM-A-2 | Injector 6 (cyl 6) | injector_out | MS3PROMINI-A-7 | Injector out C | injector_out | single_source | |
| OEM-A-20 | O2 sensor 1 (primary) | lambda_nb_in | MS3PROMINI-A-14 | Analog in 2 | analog_in | single_source | |
| OEM-A-21 | Diagnostic L-line | serial | — | — | — | single_source | |
| OEM-A-22 | Tachometer output | tacho_out | — | — | — | single_source | |
| OEM-A-23 | ECU main power (from engine-electronics relay) | power_in | MS3PROMINI-A-1 | 12V+ switched power in | power_in | single_source | |
| OEM-A-24 | Injector 1 (cyl 1) | injector_out | MS3PROMINI-A-10 | Injector out F | injector_out | single_source | |
| OEM-A-25 | Injector 5 (cyl 5) | injector_out | MS3PROMINI-A-6 | Injector out B | injector_out | single_source | |
| OEM-A-26 | Injector 3 (cyl 3) | injector_out | MS3PROMINI-A-12 | Injector out H | injector_out | single_source | |
| OEM-A-27 | Idle air control valve | low_side_out | MS3PROMINI-A-9 | Injector out E | injector_out | single_source | |
| OEM-A-3 | Injector 2 (cyl 2) | injector_out | MS3PROMINI-A-11 | Injector out G | injector_out | single_source | |
| OEM-A-31 | EVAP canister purge valve | low_side_out | — | — | — | single_source | |
| OEM-A-33 | Sensor ground bus | sensor_ground | MS3PROMINI-A-21 | Sensor ground | sensor_ground | single_source | |
| OEM-A-34 | Knock sensor 1 | knock_in | — | — | — | single_source | |
| OEM-A-36 | Intake air temperature (IAT) | temp_in | MS3PROMINI-A-15 | Analog in 3 | analog_in | single_source | |
| OEM-A-37 | A/C compressor switch | digital_in | MS3PROMINI-A-29 | Digital switched in 1 / Flex fuel | digital_in | single_source | |
| OEM-A-38 | Ignition switch (run/start) | digital_in | — | — | — | single_source | |
| OEM-A-39 | A/C switch (cabin) | digital_in | MS3PROMINI-A-35 | Digital frequency in 2 (Hall) | digital_in | single_source | |
| OEM-A-4 | Injector 4 (cyl 4) | injector_out | MS3PROMINI-A-5 | Injector out A | injector_out | single_source | |
| OEM-A-40 | Throttle position sensor 1 | analog_in | MS3PROMINI-A-28 | TPS in | analog_in | single_source | |
| OEM-A-41 | TPS power (+5V) | vref | MS3PROMINI-A-2 | +5V VREF out | vref | single_source | |
| OEM-A-43 | Diagnostic K-line | serial | — | — | — | single_source | |
| OEM-A-44 | Camshaft position sensor (G40) | trigger_in | MS3PROMINI-A-32 | CMP+ | trigger_in | single_source | |
| OEM-A-49 | Secondary air injection relay control | low_side_out | MS3PROMINI-A-4 | Fuel pump out | low_side_out | single_source | |
| OEM-A-5 | Check engine light (MIL) | low_side_out | — | — | — | single_source | |
| OEM-A-51 | MFA fuel-consumption signal | tacho_out | — | — | — | single_source | |
| OEM-A-52 | Ignition coil 4 (coil pack pin 4) | ignition_out | MS3PROMINI-A-19 | Spark out C | ignition_out | single_source | |
| OEM-A-53 | Idle air control valve (2nd) | low_side_out | — | — | — | single_source | |
| OEM-A-54 | Battery constant (+12V) | power_in | — | — | — | single_source | |
| OEM-A-55 | Ground (E-3) | ground | MS3PROMINI-A-22 + MS3PROMINI-A-23 | Power ground + Power ground | ground | single_source | |
| OEM-A-56 | Ground (E-4) | ground | MS3PROMINI-A-22 + MS3PROMINI-A-23 | Power ground + Power ground | ground | single_source | |
| OEM-A-59 | Mass airflow sensor (5th terminal) | sensor_out | — | — | — | single_source | |
| OEM-A-6 | Fuel pump relay control | low_side_out | MS3PROMINI-A-3 | PWM out 1 / Idle | low_side_out | single_source | |
| OEM-A-60 | Ignition coil 3 (coil pack pin 3) | ignition_out | MS3PROMINI-A-18 | Spark out B | ignition_out | single_source | |
| OEM-A-65 | Vehicle speed sensor (VSS) | digital_in | MS3PROMINI-A-34 | Digital frequency in 1 (Hall) | digital_in | single_source | |
| OEM-A-67 | Crank sensor return (VR-) | sensor_ground | MS3PROMINI-A-21 | Sensor ground | sensor_ground | single_source | |
| OEM-A-68 | Crank position sensor (G28, VR+) | trigger_in | MS3PROMINI-A-30 | CKP+ | trigger_in | single_source | |
| OEM-A-7 | Ground (E-2) | ground | MS3PROMINI-A-22 + MS3PROMINI-A-23 | Power ground + Power ground | ground | single_source | |
| OEM-A-8 | Ignition coil 2 (coil pack pin 2) | ignition_out | MS3PROMINI-A-17 | Spark out A | ignition_out | single_source | |
| OEM-A-9 | Engine electronics relay control | low_side_out | MS3PROMINI-A-8 | Injector out D | injector_out | single_source |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-A-23 | SP-14V-1 | 0.85 | no route | ECU main power (from engine-electronics relay) | — | |
| W2 | SP-14V-1 | MS3PROMINI-A-1 | 0.85 | no route | 12V+ switched power in | — | |
| W3 | OEM-A-1 | SP-GND-1 | 0.85 | no route | Ground (E-1) | — | |
| W4 | OEM-A-10 | SP-GND-1 | 0.85 | no route | Ground (OBD1 EGR enable) | — | |
| W5 | OEM-A-55 | SP-GND-1 | 0.85 | no route | Ground (E-3) | — | |
| W6 | OEM-A-56 | SP-GND-1 | 0.85 | no route | Ground (E-4) | — | |
| W7 | OEM-A-7 | SP-GND-1 | 0.85 | no route | Ground (E-2) | — | |
| W8 | SP-GND-1 | MS3PROMINI-A-22 | 0.85 | no route | Power ground | — | |
| W9 | SP-GND-1 | MS3PROMINI-A-23 | 0.85 | no route | Power ground | — | |
| W10 | OEM-A-16 | SP-0V-1 | 0.5 | no route | MAF ground | — | |
| W11 | OEM-A-33 | SP-0V-1 | 0.5 | no route | Sensor ground bus | — | |
| W12 | OEM-A-67 | SP-0V-1 | 0.5 | no route | Crank sensor return (VR-) | — | |
| W13 | SP-0V-1 | MS3PROMINI-A-21 | 0.5 | no route | Sensor ground | — | |
| W14 | OEM-A-41 | MS3PROMINI-A-2 | 0.5 | no route | TPS power (+5V) | — | |
| W15 | OEM-A-68 | MS3PROMINI-A-30 | 0.5 | no route | Crank position sensor (G28, VR+) | — | |
| W16 | OEM-A-44 | MS3PROMINI-A-32 | 0.5 | no route | Camshaft position sensor (G40) | — | |
| W17 | OEM-A-8 | MS3PROMINI-A-17 | 0.5 | no route | Ignition coil 2 (coil pack pin 2) | — | |
| W18 | OEM-A-60 | MS3PROMINI-A-18 | 0.5 | no route | Ignition coil 3 (coil pack pin 3) | — | |
| W19 | OEM-A-52 | MS3PROMINI-A-19 | 0.5 | no route | Ignition coil 4 (coil pack pin 4) | — | |
| W20 | OEM-A-24 | MS3PROMINI-A-10 | 0.5 | no route | Injector 1 (cyl 1) | — | |
| W21 | OEM-A-3 | MS3PROMINI-A-11 | 0.5 | no route | Injector 2 (cyl 2) | — | |
| W22 | OEM-A-26 | MS3PROMINI-A-12 | 0.5 | no route | Injector 3 (cyl 3) | — | |
| W23 | OEM-A-4 | MS3PROMINI-A-5 | 0.5 | no route | Injector 4 (cyl 4) | — | |
| W24 | OEM-A-25 | MS3PROMINI-A-6 | 0.5 | no route | Injector 5 (cyl 5) | — | |
| W25 | OEM-A-2 | MS3PROMINI-A-7 | 0.5 | no route | Injector 6 (cyl 6) | — | |
| W26 | OEM-A-17 | MS3PROMINI-A-13 | 0.5 | no route | MAF signal | — | |
| W27 | OEM-A-40 | MS3PROMINI-A-28 | 0.5 | no route | Throttle position sensor 1 | — | |
| W28 | OEM-A-14 | MS3PROMINI-A-26 | 0.5 | no route | Coolant temperature (CLT) | — | |
| W29 | OEM-A-49 | MS3PROMINI-A-4 | 0.5 | no route | Secondary air injection relay control | — | |
| W30 | OEM-A-6 | MS3PROMINI-A-3 | 0.5 | no route | Fuel pump relay control | — | |
| W31 | OEM-A-9 | MS3PROMINI-A-8 | 0.5 | no route | Engine electronics relay control | — | |
| W32 | OEM-A-27 | MS3PROMINI-A-9 | 0.5 | no route | Idle air control valve | — | |
| W33 | OEM-A-20 | MS3PROMINI-A-14 | 0.5 | no route | O2 sensor 1 (primary) | — | |
| W34 | OEM-A-15 | MS3PROMINI-A-27 | 0.5 | no route | EGR temperature sensor | — | |
| W35 | OEM-A-36 | MS3PROMINI-A-15 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W36 | OEM-A-65 | MS3PROMINI-A-34 | 0.5 | no route | Vehicle speed sensor (VSS) | — | |
| W37 | OEM-A-37 | MS3PROMINI-A-29 | 0.5 | no route | A/C compressor switch | — | |
| W38 | OEM-A-39 | MS3PROMINI-A-35 | 0.5 | no route | A/C switch (cabin) | — |
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 |
|---|---|---|---|
| error | REQUIRED_UNMAPPED | OEM-A-34 | Required OEM function "Knock sensor 1" (knock_in) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-A-38 | Required OEM function "Ignition switch (run/start)" (digital_in) is not connected to the new ECU. |
| info | NET_FAMILY | OEM-A-27 ↔ MS3PROMINI-A-9 | OEM-A-27 "Idle air control valve" [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-A-36 ↔ MS3PROMINI-A-15 | OEM-A-36 "Intake air temperature (IAT)" [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-A-9 ↔ MS3PROMINI-A-8 | OEM-A-9 "Engine electronics relay control" [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 | 8 optional OEM pins are not mapped: OEM-A-21 Diagnostic L-line; OEM-A-22 Tachometer output; OEM-A-31 EVAP canister purge valve; OEM-A-43 Diagnostic K-line; OEM-A-5 Check engine light (MIL); OEM-A-51 MFA fuel-consumption signal; OEM-A-53 Idle air control valve (2nd); OEM-A-59 Mass airflow sensor (5th terminal) |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-A-54 | 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. Open items: - OEM-A 34: Knock sensor 1: no free knock input on AMP EFI MS3Pro Mini - OEM-A 38: Ignition switch (run/start): 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 Not wired: - OEM-A 54: Battery constant (+12V): AMP EFI MS3Pro Mini has no battery-constant input; not needed - OEM-A 31: EVAP canister purge valve: no free low_side/relay_control/heater_low_side/ls_hs/injector on AMP EFI MS3Pro Mini - OEM-A 5: Check engine light (MIL): no free low_side/relay_control/heater_low_side/ls_hs/injector on AMP EFI MS3Pro Mini - OEM-A 53: Idle air control valve (2nd): no free low_side/relay_control/heater_low_side/ls_hs/injector on AMP EFI MS3Pro Mini - OEM-A 22: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on AMP EFI MS3Pro Mini - OEM-A 51: MFA fuel-consumption signal: no free tacho/frequency_out/low_side/ls_hs on AMP EFI MS3Pro Mini - OEM-A 21: Diagnostic L-line: no free k_line on AMP EFI MS3Pro Mini - OEM-A 43: Diagnostic K-line: no free k_line on AMP EFI MS3Pro Mini - OEM-A 59: Mass airflow sensor (5th terminal): no rule for class sensor_signal; wire by hand
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 |
| 2 | community_copy | a2resource: VR6/ABA Motronic M2.9 (OBD1) engine control unit pinout | http://www.a2resource.com/electrical/management/motronicvr6aba.html | — | — | — |