VW Corrado VR6 12v (AAA) Motronic M2.9 OBD1 → AMP EFI MS3Pro EVO+ HC (auto)
VW Corrado VR6 12v (AAA) Motronic M2.9 OBD1 — AMP EFI — MS3Pro EVO+ HC
Drawn by Michael Gnankou · Rev 0 · proposal · 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 | proposal · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | none |
| Size of the job | 55 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-A-23 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | SP-14V-1 | MS3PROEVOHC-A-35 | 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 | MS3PROEVOHC-B-3 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | MS3PROEVOHC-B-5 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-GND-1 | MS3PROEVOHC-B-7 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-GND-1 | MS3PROEVOHC-B-9 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-A-16 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-A-33 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-A-67 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | SP-0V-1 | MS3PROEVOHC-A-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | SP-0V-1 | MS3PROEVOHC-A-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | SP-0V-1 | MS3PROEVOHC-C-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | SP-0V-1 | MS3PROEVOHC-C-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | SP-0V-1 | MS3PROEVOHC-C-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | SP-0V-1 | MS3PROEVOHC-C-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | SP-0V-1 | MS3PROEVOHC-C-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-A-41 | MS3PROEVOHC-A-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-A-68 | MS3PROEVOHC-A-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | SP-0V-1 | MS3PROEVOHC-A-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-A-44 | MS3PROEVOHC-A-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | SP-0V-1 | MS3PROEVOHC-A-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-A-34 | MS3PROEVOHC-A-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-A-8 | MS3PROEVOHC-B-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-A-60 | MS3PROEVOHC-B-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-A-52 | MS3PROEVOHC-B-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-A-24 | MS3PROEVOHC-A-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-A-3 | MS3PROEVOHC-A-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-A-26 | MS3PROEVOHC-B-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-A-4 | MS3PROEVOHC-B-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-A-25 | MS3PROEVOHC-B-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-A-2 | MS3PROEVOHC-B-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-A-38 | MS3PROEVOHC-B-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-A-17 | MS3PROEVOHC-A-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-A-40 | MS3PROEVOHC-A-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-A-14 | MS3PROEVOHC-A-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-A-49 | MS3PROEVOHC-A-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-A-6 | MS3PROEVOHC-A-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-A-9 | MS3PROEVOHC-C-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-A-27 | MS3PROEVOHC-A-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-A-31 | MS3PROEVOHC-C-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-A-5 | MS3PROEVOHC-A-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-A-53 | MS3PROEVOHC-C-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | OEM-A-22 | MS3PROEVOHC-A-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W49 | OEM-A-51 | MS3PROEVOHC-C-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W50 | OEM-A-20 | MS3PROEVOHC-A-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W51 | OEM-A-15 | MS3PROEVOHC-A-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W52 | OEM-A-36 | MS3PROEVOHC-A-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W53 | OEM-A-65 | MS3PROEVOHC-B-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W54 | OEM-A-37 | MS3PROEVOHC-A-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W55 | OEM-A-39 | MS3PROEVOHC-B-20 | 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 | MS3PROEVOHC-A-13 | MS3PROEVOHC-A-35 | open (OL) | sensor ground must not touch +12 V supply | |
| 2 | MS3PROEVOHC-A-13 | MS3PROEVOHC-A-8 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 3 | MS3PROEVOHC-A-35 | MS3PROEVOHC-A-8 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 4 | MS3PROEVOHC-B-3 | MS3PROEVOHC-A-35 | open (OL) | power ground must not touch +12 V supply | |
| 5 | MS3PROEVOHC-B-3 | MS3PROEVOHC-A-8 | 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
MS3PROEVOHC-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | High current out 1 | — | — | — | — | — | — | — | — |
| 10 | MAT in | — | W51 | — | 0.5 | OEM-A-15 | — | — | — |
| 11 | CLT in | — | W40 | — | 0.5 | OEM-A-14 | — | — | — |
| 12 | Analog In 6 | — | — | — | — | — | — | — | — |
| 13 | Logic Ground | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 14 | PWM / Idle Out 1 | — | W42 | — | 0.5 | OEM-A-6 | — | — | — |
| 15 | CKP− | — | W24 | — | 0.5 | SP-0V-1 | — | — | — |
| 16 | Ground Shield Drain | — | — | — | — | — | — | — | — |
| 17 | Analog In 7 | — | — | — | — | — | — | — | — |
| 18 | Sensor return | — | W16 | — | 0.5 | SP-0V-1 | — | — | — |
| 19 | Analog in 1 | — | W38 | — | 0.5 | OEM-A-17 | — | — | — |
| 2 | High current out 2 | — | — | — | — | — | — | — | — |
| 20 | Analog in 2 | — | W52 | — | 0.5 | OEM-A-36 | — | — | — |
| 21 | Analog in 3 | — | — | — | — | — | — | — | — |
| 22 | Analog In 4 | — | — | — | — | — | — | — | — |
| 23 | Analog In 5 | — | — | — | — | — | — | — | — |
| 24 | Tach out | — | W48 | — | 0.5 | OEM-A-22 | — | — | — |
| 25 | O2 in | — | W50 | — | 0.5 | OEM-A-20 | — | — | — |
| 26 | CMP+ | — | W25 | — | 0.5 | OEM-A-44 | — | — | — |
| 27 | CMP− | — | W26 | — | 0.5 | SP-0V-1 | — | — | — |
| 28 | Fuel pump relay out | — | W41 | — | 0.5 | OEM-A-49 | — | — | — |
| 29 | PWM out 2 | — | W44 | — | 0.5 | OEM-A-27 | — | — | — |
| 3 | Injector out J | — | W31 | — | 0.5 | OEM-A-24 | — | — | — |
| 30 | PWM out 3 | — | W46 | — | 0.5 | OEM-A-5 | — | — | — |
| 31 | Knock in 1 | — | W27 | — | 0.5 | OEM-A-34 | — | — | — |
| 32 | Digital switched in 1 | — | W54 | — | 0.5 | OEM-A-37 | — | — | — |
| 33 | CAN L | — | — | — | — | — | — | — | — |
| 34 | CAN H | — | — | — | — | — | — | — | — |
| 35 | 12V+ switched power in | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 4 | Injector out I | — | W32 | — | 0.5 | OEM-A-3 | — | — | — |
| 5 | High current out 3 | — | — | — | — | — | — | — | — |
| 6 | CKP+ | — | W23 | — | 0.5 | OEM-A-68 | — | — | — |
| 7 | Knock In 2 | — | — | — | — | — | — | — | — |
| 8 | 5V+ VREF out | — | W22 | — | 0.5 | OEM-A-41 | — | — | — |
| 9 | TPS in | — | W39 | — | 0.5 | OEM-A-40 | — | — | — |
MS3PROEVOHC-B
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injector out A | — | W33 | — | 0.5 | OEM-A-26 | — | — | — |
| 10 | Injector out F | — | W34 | — | 0.5 | OEM-A-4 | — | — | — |
| 11 | Injector out G | — | W35 | — | 0.5 | OEM-A-25 | — | — | — |
| 12 | Injector out H | — | W36 | — | 0.5 | OEM-A-2 | — | — | — |
| 13 | Spark out G | — | W28 | — | 0.5 | OEM-A-8 | — | — | — |
| 14 | Spark out E | — | W29 | — | 0.5 | OEM-A-60 | — | — | — |
| 15 | Spark out C | — | W30 | — | 0.5 | OEM-A-52 | — | — | — |
| 16 | Spark out H | — | — | — | — | — | — | — | — |
| 17 | Digital frequency in 2 (Hall) | — | — | — | — | — | — | — | — |
| 18 | Ground Shield Drain | — | — | — | — | — | — | — | — |
| 19 | Digital switched 12V in | — | W37 | — | 0.5 | OEM-A-38 | — | — | — |
| 2 | Injector out B | — | — | — | — | — | — | — | — |
| 20 | Digital switched in 2 | — | W55 | — | 0.5 | OEM-A-39 | — | — | — |
| 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) | — | W53 | — | 0.5 | OEM-A-65 | — | — | — |
| 29 | Digital switched in 3 | — | — | — | — | — | — | — | — |
| 3 | Ground | — | W8 | — | 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+) | — | — | — | — | — | — | — | — |
| 35 | Digital Frequency in 1 (VR−) | — | — | — | — | — | — | — | — |
| 4 | Injector out C | — | — | — | — | — | — | — | — |
| 5 | Ground | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| 6 | Injector out D | — | — | — | — | — | — | — | — |
| 7 | Ground | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
| 8 | Injector out E | — | — | — | — | — | — | — | — |
| 9 | Ground | — | W11 | — | 0.85 | SP-GND-1 | — | — | — |
MS3PROEVOHC-C
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | PWM out 5 | — | W49 | — | 0.5 | OEM-A-51 | — | — | — |
| 10 | Digital switched in 5 | — | — | — | — | — | — | — | — |
| 11 | Digital switched in 4 | — | — | — | — | — | — | — | — |
| 12 | Digital I/O 5 | — | — | — | — | — | — | — | — |
| 13 | Digital I/O 3 | — | — | — | — | — | — | — | — |
| 14 | Digital I/O 1 | — | — | — | — | — | — | — | — |
| 15 | 5V+ VREF out 2 | — | — | — | — | — | — | — | — |
| 17 | Sensor return | — | W17 | — | 0.5 | SP-0V-1 | — | — | — |
| 18 | Sensor return | — | W18 | — | 0.5 | SP-0V-1 | — | — | — |
| 19 | Sensor return | — | W19 | — | 0.5 | SP-0V-1 | — | — | — |
| 2 | PWM out 4 | — | W47 | — | 0.5 | OEM-A-53 | — | — | — |
| 20 | Sensor return | — | W20 | — | 0.5 | SP-0V-1 | — | — | — |
| 21 | Sensor return | — | W21 | — | 0.5 | SP-0V-1 | — | — | — |
| 22 | 5V+ VREF out 1 | — | — | — | — | — | — | — | — |
| 3 | Digital out 2 | — | W45 | — | 0.5 | OEM-A-31 | — | — | — |
| 4 | Digital out 1 | — | W43 | — | 0.5 | OEM-A-9 | — | — | — |
| 5 | Digital I/O 4 | — | — | — | — | — | — | — | — |
| 6 | Digital I/O 2 | — | — | — | — | — | — | — | — |
| 7 | Analog in 8 | — | — | — | — | — | — | — | — |
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) | — | W40 | — | 0.5 | MS3PROEVOHC-A-11 | — | — | — |
| 15 | EGR temperature sensor | — | W51 | — | 0.5 | MS3PROEVOHC-A-10 | — | — | — |
| 16 | MAF ground | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 17 | MAF signal | — | W38 | — | 0.5 | MS3PROEVOHC-A-19 | — | — | — |
| 2 | Injector 6 (cyl 6) | — | W36 | — | 0.5 | MS3PROEVOHC-B-12 | — | — | — |
| 20 | O2 sensor 1 (primary) | — | W50 | — | 0.5 | MS3PROEVOHC-A-25 | — | — | — |
| 21 | Diagnostic L-line | — | — | — | — | — | — | — | — |
| 22 | Tachometer output | — | W48 | — | 0.5 | MS3PROEVOHC-A-24 | — | — | — |
| 23 | ECU main power (from engine-electronics relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 24 | Injector 1 (cyl 1) | — | W31 | — | 0.5 | MS3PROEVOHC-A-3 | — | — | — |
| 25 | Injector 5 (cyl 5) | — | W35 | — | 0.5 | MS3PROEVOHC-B-11 | — | — | — |
| 26 | Injector 3 (cyl 3) | — | W33 | — | 0.5 | MS3PROEVOHC-B-1 | — | — | — |
| 27 | Idle air control valve | — | W44 | — | 0.5 | MS3PROEVOHC-A-29 | — | — | — |
| 3 | Injector 2 (cyl 2) | — | W32 | — | 0.5 | MS3PROEVOHC-A-4 | — | — | — |
| 31 | EVAP canister purge valve | — | W45 | — | 0.5 | MS3PROEVOHC-C-3 | — | — | — |
| 33 | Sensor ground bus | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 34 | Knock sensor 1 | — | W27 | — | 0.5 | MS3PROEVOHC-A-31 | — | — | — |
| 36 | Intake air temperature (IAT) | — | W52 | — | 0.5 | MS3PROEVOHC-A-20 | — | — | — |
| 37 | A/C compressor switch | — | W54 | — | 0.5 | MS3PROEVOHC-A-32 | — | — | — |
| 38 | Ignition switch (run/start) | — | W37 | — | 0.5 | MS3PROEVOHC-B-19 | — | — | — |
| 39 | A/C switch (cabin) | — | W55 | — | 0.5 | MS3PROEVOHC-B-20 | — | — | — |
| 4 | Injector 4 (cyl 4) | — | W34 | — | 0.5 | MS3PROEVOHC-B-10 | — | — | — |
| 40 | Throttle position sensor 1 | — | W39 | — | 0.5 | MS3PROEVOHC-A-9 | — | — | — |
| 41 | TPS power (+5V) | — | W22 | — | 0.5 | MS3PROEVOHC-A-8 | — | — | — |
| 43 | Diagnostic K-line | — | — | — | — | — | — | — | — |
| 44 | Camshaft position sensor (G40) | — | W25 | — | 0.5 | MS3PROEVOHC-A-26 | — | — | — |
| 49 | Secondary air injection relay control | — | W41 | — | 0.5 | MS3PROEVOHC-A-28 | — | — | — |
| 5 | Check engine light (MIL) | — | W46 | — | 0.5 | MS3PROEVOHC-A-30 | — | — | — |
| 51 | MFA fuel-consumption signal | — | W49 | — | 0.5 | MS3PROEVOHC-C-1 | — | — | — |
| 52 | Ignition coil 4 (coil pack pin 4) | — | W30 | — | 0.5 | MS3PROEVOHC-B-15 | — | — | — |
| 53 | Idle air control valve (2nd) | — | W47 | — | 0.5 | MS3PROEVOHC-C-2 | — | — | — |
| 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 | — | W42 | — | 0.5 | MS3PROEVOHC-A-14 | — | — | — |
| 60 | Ignition coil 3 (coil pack pin 3) | — | W29 | — | 0.5 | MS3PROEVOHC-B-14 | — | — | — |
| 65 | Vehicle speed sensor (VSS) | — | W53 | — | 0.5 | MS3PROEVOHC-B-28 | — | — | — |
| 67 | Crank sensor return (VR-) | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 68 | Crank position sensor (G28, VR+) | — | W23 | — | 0.5 | MS3PROEVOHC-A-6 | — | — | — |
| 7 | Ground (E-2) | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 8 | Ignition coil 2 (coil pack pin 2) | — | W28 | — | 0.5 | MS3PROEVOHC-B-13 | — | — | — |
| 9 | Engine electronics relay control | — | W43 | — | 0.5 | MS3PROEVOHC-C-4 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W12 | — | 0.5 | OEM-A-16 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | OEM-A-33 | — | — | — |
| 1 | — | — | W14 | — | 0.5 | OEM-A-67 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | MS3PROEVOHC-A-13 | — | — | — |
| 1 | — | — | W16 | — | 0.5 | MS3PROEVOHC-A-18 | — | — | — |
| 1 | — | — | W17 | — | 0.5 | MS3PROEVOHC-C-17 | — | — | — |
| 1 | — | — | W18 | — | 0.5 | MS3PROEVOHC-C-18 | — | — | — |
| 1 | — | — | W19 | — | 0.5 | MS3PROEVOHC-C-19 | — | — | — |
| 1 | — | — | W20 | — | 0.5 | MS3PROEVOHC-C-20 | — | — | — |
| 1 | — | — | W21 | — | 0.5 | MS3PROEVOHC-C-21 | — | — | — |
| 1 | — | — | W24 | — | 0.5 | MS3PROEVOHC-A-15 | — | — | — |
| 1 | — | — | W26 | — | 0.5 | MS3PROEVOHC-A-27 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-A-23 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | MS3PROEVOHC-A-35 | — | — | — |
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 | MS3PROEVOHC-B-3 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | MS3PROEVOHC-B-5 | — | — | — |
| 1 | — | — | W10 | — | 0.85 | MS3PROEVOHC-B-7 | — | — | — |
| 1 | — | — | W11 | — | 0.85 | MS3PROEVOHC-B-9 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-A-1 | Ground (E-1) | ground | MS3PROEVOHC-B-3 + MS3PROEVOHC-B-5 + MS3PROEVOHC-B-7 + MS3PROEVOHC-B-9 | Ground + Ground + Ground + Ground | ground | single_source | |
| OEM-A-10 | Ground (OBD1 EGR enable) | ground | MS3PROEVOHC-B-3 + MS3PROEVOHC-B-5 + MS3PROEVOHC-B-7 + MS3PROEVOHC-B-9 | Ground + Ground + Ground + Ground | ground | single_source | |
| OEM-A-14 | Coolant temperature (CLT) | temp_in | MS3PROEVOHC-A-11 | CLT in | temp_in | single_source | |
| OEM-A-15 | EGR temperature sensor | temp_in | MS3PROEVOHC-A-10 | MAT in | temp_in | single_source | |
| OEM-A-16 | MAF ground | sensor_ground | MS3PROEVOHC-A-13 + MS3PROEVOHC-A-15 + MS3PROEVOHC-A-18 + MS3PROEVOHC-A-27 + MS3PROEVOHC-C-17 + MS3PROEVOHC-C-18 + MS3PROEVOHC-C-19 + MS3PROEVOHC-C-20 + MS3PROEVOHC-C-21 | Logic Ground + CKP− + Sensor return + CMP− + Sensor return + Sensor return + Sensor return + Sensor return + Sensor return | sensor_ground + trigger_in | single_source | |
| OEM-A-17 | MAF signal | analog_in | MS3PROEVOHC-A-19 | Analog in 1 | analog_in | single_source | |
| OEM-A-2 | Injector 6 (cyl 6) | injector_out | MS3PROEVOHC-B-12 | Injector out H | injector_out | single_source | |
| OEM-A-20 | O2 sensor 1 (primary) | lambda_nb_in | MS3PROEVOHC-A-25 | O2 in | lambda_nb_in | single_source | |
| OEM-A-21 | Diagnostic L-line | serial | — | — | — | single_source | |
| OEM-A-22 | Tachometer output | tacho_out | MS3PROEVOHC-A-24 | Tach out | tacho_out | single_source | |
| OEM-A-23 | ECU main power (from engine-electronics relay) | power_in | MS3PROEVOHC-A-35 | 12V+ switched power in | power_in | single_source | |
| OEM-A-24 | Injector 1 (cyl 1) | injector_out | MS3PROEVOHC-A-3 | Injector out J | injector_out | single_source | |
| OEM-A-25 | Injector 5 (cyl 5) | injector_out | MS3PROEVOHC-B-11 | Injector out G | injector_out | single_source | |
| OEM-A-26 | Injector 3 (cyl 3) | injector_out | MS3PROEVOHC-B-1 | Injector out A | injector_out | single_source | |
| OEM-A-27 | Idle air control valve | low_side_out | MS3PROEVOHC-A-29 | PWM out 2 | low_side_out | single_source | |
| OEM-A-3 | Injector 2 (cyl 2) | injector_out | MS3PROEVOHC-A-4 | Injector out I | injector_out | single_source | |
| OEM-A-31 | EVAP canister purge valve | low_side_out | MS3PROEVOHC-C-3 | Digital out 2 | low_side_out | single_source | |
| OEM-A-33 | Sensor ground bus | sensor_ground | MS3PROEVOHC-A-13 + MS3PROEVOHC-A-15 + MS3PROEVOHC-A-18 + MS3PROEVOHC-A-27 + MS3PROEVOHC-C-17 + MS3PROEVOHC-C-18 + MS3PROEVOHC-C-19 + MS3PROEVOHC-C-20 + MS3PROEVOHC-C-21 | Logic Ground + CKP− + Sensor return + CMP− + Sensor return + Sensor return + Sensor return + Sensor return + Sensor return | sensor_ground + trigger_in | single_source | |
| OEM-A-34 | Knock sensor 1 | knock_in | MS3PROEVOHC-A-31 | Knock in 1 | knock_in | single_source | |
| OEM-A-36 | Intake air temperature (IAT) | temp_in | MS3PROEVOHC-A-20 | Analog in 2 | analog_in | single_source | |
| OEM-A-37 | A/C compressor switch | digital_in | MS3PROEVOHC-A-32 | Digital switched in 1 | digital_in | single_source | |
| OEM-A-38 | Ignition switch (run/start) | digital_in | MS3PROEVOHC-B-19 | Digital switched 12V in | digital_in | single_source | |
| OEM-A-39 | A/C switch (cabin) | digital_in | MS3PROEVOHC-B-20 | Digital switched in 2 | digital_in | single_source | |
| OEM-A-4 | Injector 4 (cyl 4) | injector_out | MS3PROEVOHC-B-10 | Injector out F | injector_out | single_source | |
| OEM-A-40 | Throttle position sensor 1 | analog_in | MS3PROEVOHC-A-9 | TPS in | analog_in | single_source | |
| OEM-A-41 | TPS power (+5V) | vref | MS3PROEVOHC-A-8 | 5V+ VREF out | vref | single_source | |
| OEM-A-43 | Diagnostic K-line | serial | — | — | — | single_source | |
| OEM-A-44 | Camshaft position sensor (G40) | trigger_in | MS3PROEVOHC-A-26 | CMP+ | trigger_in | single_source | |
| OEM-A-49 | Secondary air injection relay control | low_side_out | MS3PROEVOHC-A-28 | Fuel pump relay out | low_side_out | single_source | |
| OEM-A-5 | Check engine light (MIL) | low_side_out | MS3PROEVOHC-A-30 | PWM out 3 | low_side_out | single_source | |
| OEM-A-51 | MFA fuel-consumption signal | tacho_out | MS3PROEVOHC-C-1 | PWM out 5 | low_side_out | single_source | |
| OEM-A-52 | Ignition coil 4 (coil pack pin 4) | ignition_out | MS3PROEVOHC-B-15 | Spark out C | ignition_out | single_source | |
| OEM-A-53 | Idle air control valve (2nd) | low_side_out | MS3PROEVOHC-C-2 | PWM out 4 | low_side_out | single_source | |
| OEM-A-54 | Battery constant (+12V) | power_in | — | — | — | single_source | |
| OEM-A-55 | Ground (E-3) | ground | MS3PROEVOHC-B-3 + MS3PROEVOHC-B-5 + MS3PROEVOHC-B-7 + MS3PROEVOHC-B-9 | Ground + Ground + Ground + Ground | ground | single_source | |
| OEM-A-56 | Ground (E-4) | ground | MS3PROEVOHC-B-3 + MS3PROEVOHC-B-5 + MS3PROEVOHC-B-7 + MS3PROEVOHC-B-9 | Ground + Ground + Ground + 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 | MS3PROEVOHC-A-14 | PWM / Idle Out 1 | low_side_out | single_source | |
| OEM-A-60 | Ignition coil 3 (coil pack pin 3) | ignition_out | MS3PROEVOHC-B-14 | Spark out E | ignition_out | single_source | |
| OEM-A-65 | Vehicle speed sensor (VSS) | digital_in | MS3PROEVOHC-B-28 | Digital frequency in 1 (unconditioned) | digital_in | single_source | |
| OEM-A-67 | Crank sensor return (VR-) | sensor_ground | MS3PROEVOHC-A-13 + MS3PROEVOHC-A-15 + MS3PROEVOHC-A-18 + MS3PROEVOHC-A-27 + MS3PROEVOHC-C-17 + MS3PROEVOHC-C-18 + MS3PROEVOHC-C-19 + MS3PROEVOHC-C-20 + MS3PROEVOHC-C-21 | Logic Ground + CKP− + Sensor return + CMP− + Sensor return + Sensor return + Sensor return + Sensor return + Sensor return | sensor_ground + trigger_in | single_source | |
| OEM-A-68 | Crank position sensor (G28, VR+) | trigger_in | MS3PROEVOHC-A-6 | CKP+ | trigger_in | single_source | |
| OEM-A-7 | Ground (E-2) | ground | MS3PROEVOHC-B-3 + MS3PROEVOHC-B-5 + MS3PROEVOHC-B-7 + MS3PROEVOHC-B-9 | Ground + Ground + Ground + Ground | ground | single_source | |
| OEM-A-8 | Ignition coil 2 (coil pack pin 2) | ignition_out | MS3PROEVOHC-B-13 | Spark out G | ignition_out | single_source | |
| OEM-A-9 | Engine electronics relay control | low_side_out | MS3PROEVOHC-C-4 | Digital out 1 | low_side_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 | MS3PROEVOHC-A-35 | 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 | MS3PROEVOHC-B-3 | 0.85 | no route | Ground | — | |
| W9 | SP-GND-1 | MS3PROEVOHC-B-5 | 0.85 | no route | Ground | — | |
| W10 | SP-GND-1 | MS3PROEVOHC-B-7 | 0.85 | no route | Ground | — | |
| W11 | SP-GND-1 | MS3PROEVOHC-B-9 | 0.85 | no route | Ground | — | |
| W12 | OEM-A-16 | SP-0V-1 | 0.5 | no route | MAF ground | — | |
| W13 | OEM-A-33 | SP-0V-1 | 0.5 | no route | Sensor ground bus | — | |
| W14 | OEM-A-67 | SP-0V-1 | 0.5 | no route | Crank sensor return (VR-) | — | |
| W15 | SP-0V-1 | MS3PROEVOHC-A-13 | 0.5 | no route | Logic Ground | — | |
| W16 | SP-0V-1 | MS3PROEVOHC-A-18 | 0.5 | no route | Sensor return | — | |
| W17 | SP-0V-1 | MS3PROEVOHC-C-17 | 0.5 | no route | Sensor return | — | |
| W18 | SP-0V-1 | MS3PROEVOHC-C-18 | 0.5 | no route | Sensor return | — | |
| W19 | SP-0V-1 | MS3PROEVOHC-C-19 | 0.5 | no route | Sensor return | — | |
| W20 | SP-0V-1 | MS3PROEVOHC-C-20 | 0.5 | no route | Sensor return | — | |
| W21 | SP-0V-1 | MS3PROEVOHC-C-21 | 0.5 | no route | Sensor return | — | |
| W22 | OEM-A-41 | MS3PROEVOHC-A-8 | 0.5 | no route | TPS power (+5V) | — | |
| W23 | OEM-A-68 | MS3PROEVOHC-A-6 | 0.5 | no route | Crank position sensor (G28, VR+) | — | |
| W24 | SP-0V-1 | MS3PROEVOHC-A-15 | 0.5 | no route | CKP− | — | |
| W25 | OEM-A-44 | MS3PROEVOHC-A-26 | 0.5 | no route | Camshaft position sensor (G40) | — | |
| W26 | SP-0V-1 | MS3PROEVOHC-A-27 | 0.5 | no route | CMP− | — | |
| W27 | OEM-A-34 | MS3PROEVOHC-A-31 | 0.5 | no route | Knock sensor 1 | — | |
| W28 | OEM-A-8 | MS3PROEVOHC-B-13 | 0.5 | no route | Ignition coil 2 (coil pack pin 2) | — | |
| W29 | OEM-A-60 | MS3PROEVOHC-B-14 | 0.5 | no route | Ignition coil 3 (coil pack pin 3) | — | |
| W30 | OEM-A-52 | MS3PROEVOHC-B-15 | 0.5 | no route | Ignition coil 4 (coil pack pin 4) | — | |
| W31 | OEM-A-24 | MS3PROEVOHC-A-3 | 0.5 | no route | Injector 1 (cyl 1) | — | |
| W32 | OEM-A-3 | MS3PROEVOHC-A-4 | 0.5 | no route | Injector 2 (cyl 2) | — | |
| W33 | OEM-A-26 | MS3PROEVOHC-B-1 | 0.5 | no route | Injector 3 (cyl 3) | — | |
| W34 | OEM-A-4 | MS3PROEVOHC-B-10 | 0.5 | no route | Injector 4 (cyl 4) | — | |
| W35 | OEM-A-25 | MS3PROEVOHC-B-11 | 0.5 | no route | Injector 5 (cyl 5) | — | |
| W36 | OEM-A-2 | MS3PROEVOHC-B-12 | 0.5 | no route | Injector 6 (cyl 6) | — | |
| W37 | OEM-A-38 | MS3PROEVOHC-B-19 | 0.5 | no route | Ignition switch (run/start) | — | |
| W38 | OEM-A-17 | MS3PROEVOHC-A-19 | 0.5 | no route | MAF signal | — | |
| W39 | OEM-A-40 | MS3PROEVOHC-A-9 | 0.5 | no route | Throttle position sensor 1 | — | |
| W40 | OEM-A-14 | MS3PROEVOHC-A-11 | 0.5 | no route | Coolant temperature (CLT) | — | |
| W41 | OEM-A-49 | MS3PROEVOHC-A-28 | 0.5 | no route | Secondary air injection relay control | — | |
| W42 | OEM-A-6 | MS3PROEVOHC-A-14 | 0.5 | no route | Fuel pump relay control | — | |
| W43 | OEM-A-9 | MS3PROEVOHC-C-4 | 0.5 | no route | Engine electronics relay control | — | |
| W44 | OEM-A-27 | MS3PROEVOHC-A-29 | 0.5 | no route | Idle air control valve | — | |
| W45 | OEM-A-31 | MS3PROEVOHC-C-3 | 0.5 | no route | EVAP canister purge valve | — | |
| W46 | OEM-A-5 | MS3PROEVOHC-A-30 | 0.5 | no route | Check engine light (MIL) | — | |
| W47 | OEM-A-53 | MS3PROEVOHC-C-2 | 0.5 | no route | Idle air control valve (2nd) | — | |
| W48 | OEM-A-22 | MS3PROEVOHC-A-24 | 0.5 | no route | Tachometer output | — | |
| W49 | OEM-A-51 | MS3PROEVOHC-C-1 | 0.5 | no route | MFA fuel-consumption signal | — | |
| W50 | OEM-A-20 | MS3PROEVOHC-A-25 | 0.5 | no route | O2 sensor 1 (primary) | — | |
| W51 | OEM-A-15 | MS3PROEVOHC-A-10 | 0.5 | no route | EGR temperature sensor | — | |
| W52 | OEM-A-36 | MS3PROEVOHC-A-20 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W53 | OEM-A-65 | MS3PROEVOHC-B-28 | 0.5 | no route | Vehicle speed sensor (VSS) | — | |
| W54 | OEM-A-37 | MS3PROEVOHC-A-32 | 0.5 | no route | A/C compressor switch | — | |
| W55 | OEM-A-39 | MS3PROEVOHC-B-20 | 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 (4)
| Severity | Code | Subject | Message |
|---|---|---|---|
| info | NET_FAMILY | MS3PROEVOHC-A-13 ↔ MS3PROEVOHC-A-27 | MS3PROEVOHC-A-13 "Logic Ground" [sensor_ground] is wired to MS3PROEVOHC-A-27 "CMP−" [trigger_in]. Trigger return tied to sensor/trigger ground: correct for single-ended trigger inputs. |
| info | NET_FAMILY | OEM-A-36 ↔ MS3PROEVOHC-A-20 | OEM-A-36 "Intake air temperature (IAT)" [temp_in] is wired to MS3PROEVOHC-A-20 "Analog in 2" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | NET_FAMILY | OEM-A-51 ↔ MS3PROEVOHC-C-1 | OEM-A-51 "MFA fuel-consumption signal" [tacho_out] is wired to MS3PROEVOHC-C-1 "PWM out 5" [low_side_out]. Tacho as a low-side output: check the tach needs a pull-up. |
| info | UNMAPPED | OEM | 3 optional OEM pins are not mapped: OEM-A-21 Diagnostic L-line; OEM-A-43 Diagnostic K-line; 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. Not wired: - OEM-A 54: Battery constant (+12V): AMP EFI MS3Pro EVO+ HC has no battery-constant input; not needed - OEM-A 21: Diagnostic L-line: no free k_line on AMP EFI MS3Pro EVO+ HC - OEM-A 43: Diagnostic K-line: no free k_line on AMP EFI MS3Pro EVO+ HC - 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 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 |
| 2 | community_copy | a2resource: VR6/ABA Motronic M2.9 (OBD1) engine control unit pinout | http://www.a2resource.com/electrical/management/motronicvr6aba.html | — | — | — |