VW Corrado VR6 12v (AAA) Motronic M2.9 OBD1 → MaxxECU MaxxECU GEN2 RACE (auto)
VW Corrado VR6 12v (AAA) Motronic M2.9 OBD1 — MaxxECU — MaxxECU GEN2 RACE
⚠ 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 | 45 wires · 8 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 | MAXXECUGEN2R-MX1-25 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-14V-1 | MAXXECUGEN2R-MX2-25 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-A-1 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-A-10 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-A-55 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-A-56 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | OEM-A-7 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | MAXXECUGEN2R-MX1-9 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-GND-1 | MAXXECUGEN2R-MX2-9 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-GND-1 | MAXXECUGEN2R-MX3-9 | 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 | MAXXECUGEN2R-MX1-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-A-41 | MAXXECUGEN2R-MX1-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-A-68 | MAXXECUGEN2R-MX1-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-A-44 | MAXXECUGEN2R-MX1-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-A-34 | MAXXECUGEN2R-MX2-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-A-8 | MAXXECUGEN2R-MX1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-A-60 | MAXXECUGEN2R-MX1-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-A-52 | MAXXECUGEN2R-MX1-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-A-24 | MAXXECUGEN2R-MX1-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-A-3 | MAXXECUGEN2R-MX1-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-A-26 | MAXXECUGEN2R-MX1-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-A-4 | MAXXECUGEN2R-MX1-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-A-25 | MAXXECUGEN2R-MX2-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-A-2 | MAXXECUGEN2R-MX2-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-A-38 | MAXXECUGEN2R-MX2-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-A-17 | MAXXECUGEN2R-MX1-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-A-40 | MAXXECUGEN2R-MX1-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-A-14 | MAXXECUGEN2R-MX1-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-A-49 | MAXXECUGEN2R-MX1-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-A-6 | MAXXECUGEN2R-MX1-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-A-9 | MAXXECUGEN2R-MX1-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-A-27 | MAXXECUGEN2R-MX1-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-A-31 | MAXXECUGEN2R-MX1-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-A-5 | MAXXECUGEN2R-MX2-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-A-53 | MAXXECUGEN2R-MX2-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-A-20 | MAXXECUGEN2R-MX1-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-A-15 | MAXXECUGEN2R-MX1-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-A-36 | MAXXECUGEN2R-MX2-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-A-65 | MAXXECUGEN2R-MX1-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-A-37 | MAXXECUGEN2R-MX1-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-A-39 | MAXXECUGEN2R-MX4-3 | 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 | MAXXECUGEN2R-MX1-14 | MAXXECUGEN2R-MX1-12 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 2 | MAXXECUGEN2R-MX1-14 | MAXXECUGEN2R-MX1-25 | open (OL) | sensor ground must not touch +12 V supply | |
| 3 | MAXXECUGEN2R-MX1-25 | MAXXECUGEN2R-MX1-12 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 4 | MAXXECUGEN2R-MX1-9 | MAXXECUGEN2R-MX1-12 | open (OL) | power ground must not touch 5 V sensor reference | |
| 5 | MAXXECUGEN2R-MX1-9 | MAXXECUGEN2R-MX1-25 | 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
MAXXECUGEN2R-MX1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Ignition 1 | — | W20 | — | 0.5 | OEM-A-8 | — | — | — |
| 10 | Digital/VR 1 SIGNAL + | — | W17 | — | 0.5 | OEM-A-68 | — | — | — |
| 11 | Digital/VR 1 SIGNAL - | — | — | — | — | — | — | — | — |
| 12 | Digital/VR 1 POWER SUPPLY | — | W16 | — | 0.5 | OEM-A-41 | — | — | — |
| 13 | Digital/VR 1 SHIELD | — | — | — | — | — | — | — | — |
| 14 | SENSOR GND | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 15 | CAN L | — | — | — | — | — | — | — | — |
| 16 | CAN H | — | — | — | — | — | — | — | — |
| 17 | GP out 5 (GND) | — | W37 | — | 0.5 | OEM-A-31 | — | — | — |
| 18 | Digital/VR 2 SIGNAL + | — | W18 | — | 0.5 | OEM-A-44 | — | — | — |
| 19 | Digital/VR 2 SIGNAL - | — | — | — | — | — | — | — | — |
| 2 | Ignition 2 | — | W21 | — | 0.5 | OEM-A-60 | — | — | — |
| 20 | Digital/VR 2 POWER SUPPLY | — | — | — | — | — | — | — | — |
| 21 | Digital/VR 2 SHIELD | — | — | — | — | — | — | — | — |
| 22 | 5V power supply | — | — | — | — | — | — | — | — |
| 23 | Digital/VR 3 SIGNAL + | — | W43 | — | 0.5 | OEM-A-65 | — | — | — |
| 24 | Digital/VR 4 SIGNAL + | — | W44 | — | 0.5 | OEM-A-37 | — | — | — |
| 25 | 12V supply 1 | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 26 | AIN 1 | — | W30 | — | 0.5 | OEM-A-17 | — | — | — |
| 27 | AIN 2 | — | W31 | — | 0.5 | OEM-A-40 | — | — | — |
| 28 | AIN 3 | — | W32 | — | 0.5 | OEM-A-14 | — | — | — |
| 29 | AIN 4 | — | W40 | — | 0.5 | OEM-A-20 | — | — | — |
| 3 | Ignition 3 | — | W22 | — | 0.5 | OEM-A-52 | — | — | — |
| 30 | AIN 5 | — | W41 | — | 0.5 | OEM-A-15 | — | — | — |
| 31 | INJECTOR 1 | — | W23 | — | 0.5 | OEM-A-24 | — | — | — |
| 32 | INJECTOR 2 | — | W24 | — | 0.5 | OEM-A-3 | — | — | — |
| 33 | INJECTOR 3 | — | W25 | — | 0.5 | OEM-A-26 | — | — | — |
| 34 | INJECTOR 4 | — | W26 | — | 0.5 | OEM-A-4 | — | — | — |
| 4 | Ignition 4 | — | — | — | — | — | — | — | — |
| 5 | GP out 1 (GND) | — | W33 | — | 0.5 | OEM-A-49 | — | — | — |
| 6 | GP out 2 (GND) | — | W34 | — | 0.5 | OEM-A-6 | — | — | — |
| 7 | GP out 3 (GND) | — | W35 | — | 0.5 | OEM-A-9 | — | — | — |
| 8 | GP out 4 (GND) | — | W36 | — | 0.5 | OEM-A-27 | — | — | — |
| 9 | Engine gnd | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
MAXXECUGEN2R-MX2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Ignition 5 | — | — | — | — | — | — | — | — |
| 10 | WBO2 Sensor 1 VS | — | — | — | — | — | — | — | — |
| 11 | WBO2 Sensor 1 COM/VREF | — | — | — | — | — | — | — | — |
| 12 | GP OUT 7 / WBO2 Sensor 1 H- | — | W39 | — | 0.5 | OEM-A-53 | — | — | — |
| 13 | AIN 9 | — | — | — | — | — | — | — | — |
| 14 | AIN 10 | — | — | — | — | — | — | — | — |
| 15 | AIN 11 | — | — | — | — | — | — | — | — |
| 16 | AIN 12 | — | — | — | — | — | — | — | — |
| 17 | AIN 13 | — | — | — | — | — | — | — | — |
| 18 | WBO2 sensor 1 RCAL | — | — | — | — | — | — | — | — |
| 19 | WBO2 sensor 1 IP | — | — | — | — | — | — | — | — |
| 2 | Ignition 6 | — | — | — | — | — | — | — | — |
| 20 | 12V WBO2 sensor 1 H+ | — | — | — | — | — | — | — | — |
| 21 | WBO2 sensor 1 SHIELD | — | — | — | — | — | — | — | — |
| 22 | AIN 14 | — | — | — | — | — | — | — | — |
| 23 | AIN 15 | — | — | — | — | — | — | — | — |
| 24 | 12V supply 3 | — | W29 | — | 0.5 | OEM-A-38 | — | — | — |
| 25 | 12V supply 2 | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 26 | KNOCK1 SHIELD | — | — | — | — | — | — | — | — |
| 27 | KNOCK 1- | — | — | — | — | — | — | — | — |
| 28 | KNOCK 1+ | — | W19 | — | 0.5 | OEM-A-34 | — | — | — |
| 29 | KNOCK 2 SHIELD | — | — | — | — | — | — | — | — |
| 3 | GP out 6 (GND) | — | W38 | — | 0.5 | OEM-A-5 | — | — | — |
| 30 | KNOCK 2- | — | — | — | — | — | — | — | — |
| 31 | KNOCK 2+ | — | — | — | — | — | — | — | — |
| 32 | AIN 16 | — | — | — | — | — | — | — | — |
| 33 | INJECTOR 5 | — | W27 | — | 0.5 | OEM-A-25 | — | — | — |
| 34 | INJECTOR 6 | — | W28 | — | 0.5 | OEM-A-2 | — | — | — |
| 4 | AIN 6 | — | W42 | — | 0.5 | OEM-A-36 | — | — | — |
| 5 | AIN 7 | — | — | — | — | — | — | — | — |
| 6 | AIN 8 | — | — | — | — | — | — | — | — |
| 7 | GP out 13 (H-BRIDGE 1) | — | — | — | — | — | — | — | — |
| 8 | GP out 14 (H-BRIDGE 1) | — | — | — | — | — | — | — | — |
| 9 | Engine gnd | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
MAXXECUGEN2R-MX3
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | GP out 15 (H-BRIDGE 2) | — | — | — | — | — | — | — | — |
| 10 | WBO2 sensor 2 VS | — | — | — | — | — | — | — | — |
| 11 | WBO2 sensor 2 COM/VREF | — | — | — | — | — | — | — | — |
| 12 | GP Out 8 (GND) / WBO2 Sensor 2 H- | — | — | — | — | — | — | — | — |
| 13 | WBO2 sensor 2 SHIELD | — | — | — | — | — | — | — | — |
| 14 | GP OUT 9 (12V) | — | — | — | — | — | — | — | — |
| 15 | GP OUT 10 (12V) | — | — | — | — | — | — | — | — |
| 16 | GP OUT 11 (12V) | — | — | — | — | — | — | — | — |
| 17 | GP OUT 12 (12V) | — | — | — | — | — | — | — | — |
| 18 | WBO2 sensor 2 RCAL | — | — | — | — | — | — | — | — |
| 19 | WBO2 sensor 2 IP | — | — | — | — | — | — | — | — |
| 2 | GP out 16 (H-BRIDGE 2) | — | — | — | — | — | — | — | — |
| 20 | 12V WBO2 sensor 2 (H+) | — | — | — | — | — | — | — | — |
| 21 | AIN 17 | — | — | — | — | — | — | — | — |
| 22 | AIN 18 | — | — | — | — | — | — | — | — |
| 23 | AIN 19 | — | — | — | — | — | — | — | — |
| 24 | AIN 20 | — | — | — | — | — | — | — | — |
| 25 | AIN 21 | — | — | — | — | — | — | — | — |
| 26 | AIN 22 | — | — | — | — | — | — | — | — |
| 27 | AIN 23 | — | — | — | — | — | — | — | — |
| 28 | AIN 24 | — | — | — | — | — | — | — | — |
| 29 | INJECTOR 7 | — | — | — | — | — | — | — | — |
| 3 | Ignition 7 | — | — | — | — | — | — | — | — |
| 30 | INJECTOR 8 | — | — | — | — | — | — | — | — |
| 31 | INJECTOR 9 | — | — | — | — | — | — | — | — |
| 32 | INJECTOR 10 | — | — | — | — | — | — | — | — |
| 33 | INJECTOR 11 | — | — | — | — | — | — | — | — |
| 34 | INJECTOR 12 | — | — | — | — | — | — | — | — |
| 4 | Ignition 8 | — | — | — | — | — | — | — | — |
| 5 | Ignition 9 | — | — | — | — | — | — | — | — |
| 6 | Ignition 10 | — | — | — | — | — | — | — | — |
| 7 | Ignition 11 | — | — | — | — | — | — | — | — |
| 8 | Ignition 12 | — | — | — | — | — | — | — | — |
| 9 | Engine gnd | — | W11 | — | 0.85 | SP-GND-1 | — | — | — |
MAXXECUGEN2R-MX4
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Digital/VR 5 SHIELD | — | — | — | — | — | — | — | — |
| 10 | EGT 1 + | — | — | — | — | — | — | — | — |
| 11 | EGT 2 + | — | — | — | — | — | — | — | — |
| 12 | EGT 3 + | — | — | — | — | — | — | — | — |
| 13 | EGT 4 + | — | — | — | — | — | — | — | — |
| 14 | EGT 5 + | — | — | — | — | — | — | — | — |
| 15 | EGT 6 + | — | — | — | — | — | — | — | — |
| 16 | EGT 7 + | — | — | — | — | — | — | — | — |
| 17 | EGT 8 + | — | — | — | — | — | — | — | — |
| 18 | EGT 1 - | — | — | — | — | — | — | — | — |
| 19 | EGT 2 - | — | — | — | — | — | — | — | — |
| 2 | Digital/VR 5 SIGNAL - | — | — | — | — | — | — | — | — |
| 20 | EGT 3 - | — | — | — | — | — | — | — | — |
| 21 | EGT 4 - | — | — | — | — | — | — | — | — |
| 22 | EGT 5 - | — | — | — | — | — | — | — | — |
| 23 | EGT 6 - | — | — | — | — | — | — | — | — |
| 24 | EGT 7 - | — | — | — | — | — | — | — | — |
| 25 | EGT 8 - | — | — | — | — | — | — | — | — |
| 26 | Digital/VR 8 SHIELD | — | — | — | — | — | — | — | — |
| 27 | Digital/VR 8 SIGNAL - | — | — | — | — | — | — | — | — |
| 28 | Digital/VR 8 SIGNAL + | — | — | — | — | — | — | — | — |
| 29 | CAN 2 L | — | — | — | — | — | — | — | — |
| 3 | Digital/VR 5 SIGNAL + | — | W45 | — | 0.5 | OEM-A-39 | — | — | — |
| 30 | CAN 2 H | — | — | — | — | — | — | — | — |
| 31 | INJECTOR 13 | — | — | — | — | — | — | — | — |
| 32 | INJECTOR 14 | — | — | — | — | — | — | — | — |
| 33 | INJECTOR 15 | — | — | — | — | — | — | — | — |
| 34 | INJECTOR 16 | — | — | — | — | — | — | — | — |
| 4 | Digital/VR 6 SHIELD | — | — | — | — | — | — | — | — |
| 5 | Digital/VR 6 SIGNAL - | — | — | — | — | — | — | — | — |
| 6 | Digital/VR 6 SIGNAL + | — | — | — | — | — | — | — | — |
| 7 | Digital/VR 7 SHIELD | — | — | — | — | — | — | — | — |
| 8 | Digital/VR 7 SIGNAL - | — | — | — | — | — | — | — | — |
| 9 | Digital/VR 7 SIGNAL + | — | — | — | — | — | — | — | — |
OEM-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Ground (E-1) | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| 10 | Ground (OBD1 EGR enable) | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 14 | Coolant temperature (CLT) | — | W32 | — | 0.5 | MAXXECUGEN2R-MX1-28 | — | — | — |
| 15 | EGR temperature sensor | — | W41 | — | 0.5 | MAXXECUGEN2R-MX1-30 | — | — | — |
| 16 | MAF ground | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 17 | MAF signal | — | W30 | — | 0.5 | MAXXECUGEN2R-MX1-26 | — | — | — |
| 2 | Injector 6 (cyl 6) | — | W28 | — | 0.5 | MAXXECUGEN2R-MX2-34 | — | — | — |
| 20 | O2 sensor 1 (primary) | — | W40 | — | 0.5 | MAXXECUGEN2R-MX1-29 | — | — | — |
| 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) | — | W23 | — | 0.5 | MAXXECUGEN2R-MX1-31 | — | — | — |
| 25 | Injector 5 (cyl 5) | — | W27 | — | 0.5 | MAXXECUGEN2R-MX2-33 | — | — | — |
| 26 | Injector 3 (cyl 3) | — | W25 | — | 0.5 | MAXXECUGEN2R-MX1-33 | — | — | — |
| 27 | Idle air control valve | — | W36 | — | 0.5 | MAXXECUGEN2R-MX1-8 | — | — | — |
| 3 | Injector 2 (cyl 2) | — | W24 | — | 0.5 | MAXXECUGEN2R-MX1-32 | — | — | — |
| 31 | EVAP canister purge valve | — | W37 | — | 0.5 | MAXXECUGEN2R-MX1-17 | — | — | — |
| 33 | Sensor ground bus | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 34 | Knock sensor 1 | — | W19 | — | 0.5 | MAXXECUGEN2R-MX2-28 | — | — | — |
| 36 | Intake air temperature (IAT) | — | W42 | — | 0.5 | MAXXECUGEN2R-MX2-4 | — | — | — |
| 37 | A/C compressor switch | — | W44 | — | 0.5 | MAXXECUGEN2R-MX1-24 | — | — | — |
| 38 | Ignition switch (run/start) | — | W29 | — | 0.5 | MAXXECUGEN2R-MX2-24 | — | — | — |
| 39 | A/C switch (cabin) | — | W45 | — | 0.5 | MAXXECUGEN2R-MX4-3 | — | — | — |
| 4 | Injector 4 (cyl 4) | — | W26 | — | 0.5 | MAXXECUGEN2R-MX1-34 | — | — | — |
| 40 | Throttle position sensor 1 | — | W31 | — | 0.5 | MAXXECUGEN2R-MX1-27 | — | — | — |
| 41 | TPS power (+5V) | — | W16 | — | 0.5 | MAXXECUGEN2R-MX1-12 | — | — | — |
| 43 | Diagnostic K-line | — | — | — | — | — | — | — | — |
| 44 | Camshaft position sensor (G40) | — | W18 | — | 0.5 | MAXXECUGEN2R-MX1-18 | — | — | — |
| 49 | Secondary air injection relay control | — | W33 | — | 0.5 | MAXXECUGEN2R-MX1-5 | — | — | — |
| 5 | Check engine light (MIL) | — | W38 | — | 0.5 | MAXXECUGEN2R-MX2-3 | — | — | — |
| 51 | MFA fuel-consumption signal | — | — | — | — | — | — | — | — |
| 52 | Ignition coil 4 (coil pack pin 4) | — | W22 | — | 0.5 | MAXXECUGEN2R-MX1-3 | — | — | — |
| 53 | Idle air control valve (2nd) | — | W39 | — | 0.5 | MAXXECUGEN2R-MX2-12 | — | — | — |
| 54 | Battery constant (+12V) | — | — | — | — | — | — | — | — |
| 55 | Ground (E-3) | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 56 | Ground (E-4) | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 59 | Mass airflow sensor (5th terminal) | — | — | — | — | — | — | — | — |
| 6 | Fuel pump relay control | — | W34 | — | 0.5 | MAXXECUGEN2R-MX1-6 | — | — | — |
| 60 | Ignition coil 3 (coil pack pin 3) | — | W21 | — | 0.5 | MAXXECUGEN2R-MX1-2 | — | — | — |
| 65 | Vehicle speed sensor (VSS) | — | W43 | — | 0.5 | MAXXECUGEN2R-MX1-23 | — | — | — |
| 67 | Crank sensor return (VR-) | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 68 | Crank position sensor (G28, VR+) | — | W17 | — | 0.5 | MAXXECUGEN2R-MX1-10 | — | — | — |
| 7 | Ground (E-2) | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 8 | Ignition coil 2 (coil pack pin 2) | — | W20 | — | 0.5 | MAXXECUGEN2R-MX1-1 | — | — | — |
| 9 | Engine electronics relay control | — | W35 | — | 0.5 | MAXXECUGEN2R-MX1-7 | — | — | — |
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 | MAXXECUGEN2R-MX1-14 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-A-23 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | MAXXECUGEN2R-MX1-25 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | MAXXECUGEN2R-MX2-25 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W4 | — | 0.85 | OEM-A-1 | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-A-10 | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-A-55 | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-A-56 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | OEM-A-7 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | MAXXECUGEN2R-MX1-9 | — | — | — |
| 1 | — | — | W10 | — | 0.85 | MAXXECUGEN2R-MX2-9 | — | — | — |
| 1 | — | — | W11 | — | 0.85 | MAXXECUGEN2R-MX3-9 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-A-1 | Ground (E-1) | ground | MAXXECUGEN2R-MX1-9 + MAXXECUGEN2R-MX2-9 + MAXXECUGEN2R-MX3-9 | Engine gnd + Engine gnd + Engine gnd | ground | single_source | |
| OEM-A-10 | Ground (OBD1 EGR enable) | ground | MAXXECUGEN2R-MX1-9 + MAXXECUGEN2R-MX2-9 + MAXXECUGEN2R-MX3-9 | Engine gnd + Engine gnd + Engine gnd | ground | single_source | |
| OEM-A-14 | Coolant temperature (CLT) | temp_in | MAXXECUGEN2R-MX1-28 | AIN 3 | analog_in | single_source | |
| OEM-A-15 | EGR temperature sensor | temp_in | MAXXECUGEN2R-MX1-30 | AIN 5 | analog_in | single_source | |
| OEM-A-16 | MAF ground | sensor_ground | MAXXECUGEN2R-MX1-14 | SENSOR GND | sensor_ground | single_source | |
| OEM-A-17 | MAF signal | analog_in | MAXXECUGEN2R-MX1-26 | AIN 1 | analog_in | single_source | |
| OEM-A-2 | Injector 6 (cyl 6) | injector_out | MAXXECUGEN2R-MX2-34 | INJECTOR 6 | injector_out | single_source | |
| OEM-A-20 | O2 sensor 1 (primary) | lambda_nb_in | MAXXECUGEN2R-MX1-29 | AIN 4 | 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 | MAXXECUGEN2R-MX1-25 + MAXXECUGEN2R-MX2-25 | 12V supply 1 + 12V supply 2 | power_in | single_source | |
| OEM-A-24 | Injector 1 (cyl 1) | injector_out | MAXXECUGEN2R-MX1-31 | INJECTOR 1 | injector_out | single_source | |
| OEM-A-25 | Injector 5 (cyl 5) | injector_out | MAXXECUGEN2R-MX2-33 | INJECTOR 5 | injector_out | single_source | |
| OEM-A-26 | Injector 3 (cyl 3) | injector_out | MAXXECUGEN2R-MX1-33 | INJECTOR 3 | injector_out | single_source | |
| OEM-A-27 | Idle air control valve | low_side_out | MAXXECUGEN2R-MX1-8 | GP out 4 (GND) | low_side_out | single_source | |
| OEM-A-3 | Injector 2 (cyl 2) | injector_out | MAXXECUGEN2R-MX1-32 | INJECTOR 2 | injector_out | single_source | |
| OEM-A-31 | EVAP canister purge valve | low_side_out | MAXXECUGEN2R-MX1-17 | GP out 5 (GND) | low_side_out | single_source | |
| OEM-A-33 | Sensor ground bus | sensor_ground | MAXXECUGEN2R-MX1-14 | SENSOR GND | sensor_ground | single_source | |
| OEM-A-34 | Knock sensor 1 | knock_in | MAXXECUGEN2R-MX2-28 | KNOCK 1+ | knock_in | single_source | |
| OEM-A-36 | Intake air temperature (IAT) | temp_in | MAXXECUGEN2R-MX2-4 | AIN 6 | analog_in | single_source | |
| OEM-A-37 | A/C compressor switch | digital_in | MAXXECUGEN2R-MX1-24 | Digital/VR 4 SIGNAL + | digital_in | single_source | |
| OEM-A-38 | Ignition switch (run/start) | digital_in | MAXXECUGEN2R-MX2-24 | 12V supply 3 | digital_in | single_source | |
| OEM-A-39 | A/C switch (cabin) | digital_in | MAXXECUGEN2R-MX4-3 | Digital/VR 5 SIGNAL + | digital_in | single_source | |
| OEM-A-4 | Injector 4 (cyl 4) | injector_out | MAXXECUGEN2R-MX1-34 | INJECTOR 4 | injector_out | single_source | |
| OEM-A-40 | Throttle position sensor 1 | analog_in | MAXXECUGEN2R-MX1-27 | AIN 2 | analog_in | single_source | |
| OEM-A-41 | TPS power (+5V) | vref | MAXXECUGEN2R-MX1-12 | Digital/VR 1 POWER SUPPLY | vref | single_source | |
| OEM-A-43 | Diagnostic K-line | serial | — | — | — | single_source | |
| OEM-A-44 | Camshaft position sensor (G40) | trigger_in | MAXXECUGEN2R-MX1-18 | Digital/VR 2 SIGNAL + | trigger_in | single_source | |
| OEM-A-49 | Secondary air injection relay control | low_side_out | MAXXECUGEN2R-MX1-5 | GP out 1 (GND) | low_side_out | single_source | |
| OEM-A-5 | Check engine light (MIL) | low_side_out | MAXXECUGEN2R-MX2-3 | GP out 6 (GND) | 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 | MAXXECUGEN2R-MX1-3 | Ignition 3 | ignition_out | single_source | |
| OEM-A-53 | Idle air control valve (2nd) | low_side_out | MAXXECUGEN2R-MX2-12 | GP OUT 7 / WBO2 Sensor 1 H- | low_side_out | single_source | |
| OEM-A-54 | Battery constant (+12V) | power_in | — | — | — | single_source | |
| OEM-A-55 | Ground (E-3) | ground | MAXXECUGEN2R-MX1-9 + MAXXECUGEN2R-MX2-9 + MAXXECUGEN2R-MX3-9 | Engine gnd + Engine gnd + Engine gnd | ground | single_source | |
| OEM-A-56 | Ground (E-4) | ground | MAXXECUGEN2R-MX1-9 + MAXXECUGEN2R-MX2-9 + MAXXECUGEN2R-MX3-9 | Engine gnd + Engine gnd + Engine gnd | 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 | MAXXECUGEN2R-MX1-6 | GP out 2 (GND) | low_side_out | single_source | |
| OEM-A-60 | Ignition coil 3 (coil pack pin 3) | ignition_out | MAXXECUGEN2R-MX1-2 | Ignition 2 | ignition_out | single_source | |
| OEM-A-65 | Vehicle speed sensor (VSS) | digital_in | MAXXECUGEN2R-MX1-23 | Digital/VR 3 SIGNAL + | digital_in | single_source | |
| OEM-A-67 | Crank sensor return (VR-) | sensor_ground | MAXXECUGEN2R-MX1-14 | SENSOR GND | sensor_ground | single_source | |
| OEM-A-68 | Crank position sensor (G28, VR+) | trigger_in | MAXXECUGEN2R-MX1-10 | Digital/VR 1 SIGNAL + | trigger_in | single_source | |
| OEM-A-7 | Ground (E-2) | ground | MAXXECUGEN2R-MX1-9 + MAXXECUGEN2R-MX2-9 + MAXXECUGEN2R-MX3-9 | Engine gnd + Engine gnd + Engine gnd | ground | single_source | |
| OEM-A-8 | Ignition coil 2 (coil pack pin 2) | ignition_out | MAXXECUGEN2R-MX1-1 | Ignition 1 | ignition_out | single_source | |
| OEM-A-9 | Engine electronics relay control | low_side_out | MAXXECUGEN2R-MX1-7 | GP out 3 (GND) | 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 | MAXXECUGEN2R-MX1-25 | 0.85 | no route | 12V supply 1 | — | |
| W3 | SP-14V-1 | MAXXECUGEN2R-MX2-25 | 0.85 | no route | 12V supply 2 | — | |
| W4 | OEM-A-1 | SP-GND-1 | 0.85 | no route | Ground (E-1) | — | |
| W5 | OEM-A-10 | SP-GND-1 | 0.85 | no route | Ground (OBD1 EGR enable) | — | |
| W6 | OEM-A-55 | SP-GND-1 | 0.85 | no route | Ground (E-3) | — | |
| W7 | OEM-A-56 | SP-GND-1 | 0.85 | no route | Ground (E-4) | — | |
| W8 | OEM-A-7 | SP-GND-1 | 0.85 | no route | Ground (E-2) | — | |
| W9 | SP-GND-1 | MAXXECUGEN2R-MX1-9 | 0.85 | no route | Engine gnd | — | |
| W10 | SP-GND-1 | MAXXECUGEN2R-MX2-9 | 0.85 | no route | Engine gnd | — | |
| W11 | SP-GND-1 | MAXXECUGEN2R-MX3-9 | 0.85 | no route | Engine gnd | — | |
| 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 | MAXXECUGEN2R-MX1-14 | 0.5 | no route | SENSOR GND | — | |
| W16 | OEM-A-41 | MAXXECUGEN2R-MX1-12 | 0.5 | no route | TPS power (+5V) | — | |
| W17 | OEM-A-68 | MAXXECUGEN2R-MX1-10 | 0.5 | no route | Crank position sensor (G28, VR+) | — | |
| W18 | OEM-A-44 | MAXXECUGEN2R-MX1-18 | 0.5 | no route | Camshaft position sensor (G40) | — | |
| W19 | OEM-A-34 | MAXXECUGEN2R-MX2-28 | 0.5 | no route | Knock sensor 1 | — | |
| W20 | OEM-A-8 | MAXXECUGEN2R-MX1-1 | 0.5 | no route | Ignition coil 2 (coil pack pin 2) | — | |
| W21 | OEM-A-60 | MAXXECUGEN2R-MX1-2 | 0.5 | no route | Ignition coil 3 (coil pack pin 3) | — | |
| W22 | OEM-A-52 | MAXXECUGEN2R-MX1-3 | 0.5 | no route | Ignition coil 4 (coil pack pin 4) | — | |
| W23 | OEM-A-24 | MAXXECUGEN2R-MX1-31 | 0.5 | no route | Injector 1 (cyl 1) | — | |
| W24 | OEM-A-3 | MAXXECUGEN2R-MX1-32 | 0.5 | no route | Injector 2 (cyl 2) | — | |
| W25 | OEM-A-26 | MAXXECUGEN2R-MX1-33 | 0.5 | no route | Injector 3 (cyl 3) | — | |
| W26 | OEM-A-4 | MAXXECUGEN2R-MX1-34 | 0.5 | no route | Injector 4 (cyl 4) | — | |
| W27 | OEM-A-25 | MAXXECUGEN2R-MX2-33 | 0.5 | no route | Injector 5 (cyl 5) | — | |
| W28 | OEM-A-2 | MAXXECUGEN2R-MX2-34 | 0.5 | no route | Injector 6 (cyl 6) | — | |
| W29 | OEM-A-38 | MAXXECUGEN2R-MX2-24 | 0.5 | no route | Ignition switch (run/start) | — | |
| W30 | OEM-A-17 | MAXXECUGEN2R-MX1-26 | 0.5 | no route | MAF signal | — | |
| W31 | OEM-A-40 | MAXXECUGEN2R-MX1-27 | 0.5 | no route | Throttle position sensor 1 | — | |
| W32 | OEM-A-14 | MAXXECUGEN2R-MX1-28 | 0.5 | no route | Coolant temperature (CLT) | — | |
| W33 | OEM-A-49 | MAXXECUGEN2R-MX1-5 | 0.5 | no route | Secondary air injection relay control | — | |
| W34 | OEM-A-6 | MAXXECUGEN2R-MX1-6 | 0.5 | no route | Fuel pump relay control | — | |
| W35 | OEM-A-9 | MAXXECUGEN2R-MX1-7 | 0.5 | no route | Engine electronics relay control | — | |
| W36 | OEM-A-27 | MAXXECUGEN2R-MX1-8 | 0.5 | no route | Idle air control valve | — | |
| W37 | OEM-A-31 | MAXXECUGEN2R-MX1-17 | 0.5 | no route | EVAP canister purge valve | — | |
| W38 | OEM-A-5 | MAXXECUGEN2R-MX2-3 | 0.5 | no route | Check engine light (MIL) | — | |
| W39 | OEM-A-53 | MAXXECUGEN2R-MX2-12 | 0.5 | no route | Idle air control valve (2nd) | — | |
| W40 | OEM-A-20 | MAXXECUGEN2R-MX1-29 | 0.5 | no route | O2 sensor 1 (primary) | — | |
| W41 | OEM-A-15 | MAXXECUGEN2R-MX1-30 | 0.5 | no route | EGR temperature sensor | — | |
| W42 | OEM-A-36 | MAXXECUGEN2R-MX2-4 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W43 | OEM-A-65 | MAXXECUGEN2R-MX1-23 | 0.5 | no route | Vehicle speed sensor (VSS) | — | |
| W44 | OEM-A-37 | MAXXECUGEN2R-MX1-24 | 0.5 | no route | A/C compressor switch | — | |
| W45 | OEM-A-39 | MAXXECUGEN2R-MX4-3 | 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 | OEM-A-14 ↔ MAXXECUGEN2R-MX1-28 | OEM-A-14 "Coolant temperature (CLT)" [temp_in] is wired to MAXXECUGEN2R-MX1-28 "AIN 3" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | NET_FAMILY | OEM-A-15 ↔ MAXXECUGEN2R-MX1-30 | OEM-A-15 "EGR temperature sensor" [temp_in] is wired to MAXXECUGEN2R-MX1-30 "AIN 5" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | NET_FAMILY | OEM-A-36 ↔ MAXXECUGEN2R-MX2-4 | OEM-A-36 "Intake air temperature (IAT)" [temp_in] is wired to MAXXECUGEN2R-MX2-4 "AIN 6" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | UNMAPPED | OEM | 5 optional OEM pins are not mapped: OEM-A-21 Diagnostic L-line; OEM-A-22 Tachometer output; OEM-A-43 Diagnostic K-line; OEM-A-51 MFA fuel-consumption signal; 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
Fit check: unconfirmed. Confirm these before building: - Trigger pattern for VW VR6 not found in the ECU's docs (No named VR6 pattern; 60-2 + hall cam via generic Missing-tooth + cam.) 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): MaxxECU MaxxECU GEN2 RACE has no battery-constant input; not needed - OEM-A 22: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on MaxxECU MaxxECU GEN2 RACE - OEM-A 51: MFA fuel-consumption signal: no free tacho/frequency_out/low_side/ls_hs on MaxxECU MaxxECU GEN2 RACE - OEM-A 21: Diagnostic L-line: no free k_line on MaxxECU MaxxECU GEN2 RACE - OEM-A 43: Diagnostic K-line: no free k_line on MaxxECU MaxxECU GEN2 RACE - 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 | MaxxECU GEN2 pinout (RACE MX1–MX4 / TRACK MX1–MX3) | http://www.maxxecu.com/webhelp/wirings-maxxecu_gen2_pinout.html | archive | 2026-10-05 | f689b8b6b08f |
| 2 | community_copy | a2resource: VR6/ABA Motronic M2.9 (OBD1) engine control unit pinout | http://www.a2resource.com/electrical/management/motronicvr6aba.html | — | — | — |