VW Corrado VR6 12v (AAA) Motronic M2.9 OBD1 → DTAFast P8 (auto)
VW Corrado VR6 12v (AAA) Motronic M2.9 OBD1 — DTAFast — P8
⚠ 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 | 47 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 | P8-C1-19 | 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 | P8-C1-15 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | P8-C1-34 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-GND-1 | P8-C1-55 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-A-16 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-A-33 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-A-67 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | SP-0V-1 | P8-C1-46 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | SP-0V-1 | P8-C1-47 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | SP-0V-1 | P8-C1-49 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | SP-0V-1 | P8-C1-51 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-A-41 | P8-C1-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-A-68 | P8-C1-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-A-44 | P8-C1-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-A-8 | P8-C1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-A-60 | P8-C1-38 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-A-52 | P8-C1-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-A-24 | P8-C1-37 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-A-3 | P8-C1-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-A-26 | P8-C1-54 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-A-4 | P8-C1-36 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-A-25 | P8-C1-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-A-2 | P8-C1-35 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-A-17 | P8-C1-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-A-40 | P8-C1-48 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-A-14 | P8-C1-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-A-49 | P8-C1-41 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-A-6 | P8-C1-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-A-9 | P8-C1-43 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-A-27 | P8-C1-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-A-31 | P8-C1-42 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-A-5 | P8-C1-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-A-53 | P8-C1-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-A-22 | P8-C1-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-A-51 | P8-C1-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-A-20 | P8-C1-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-A-15 | P8-C1-45 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-A-36 | P8-C1-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-A-65 | P8-C1-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-A-37 | P8-C1-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-A-39 | P8-C1-14 | 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 | P8-C1-15 | P8-C1-10 | open (OL) | power ground must not touch 5 V sensor reference | |
| 2 | P8-C1-15 | P8-C1-19 | open (OL) | power ground must not touch +12 V supply | |
| 3 | P8-C1-19 | P8-C1-10 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 4 | P8-C1-46 | P8-C1-10 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 5 | P8-C1-46 | P8-C1-19 | open (OL) | sensor 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
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) | — | W32 | — | 0.5 | P8-C1-26 | — | — | — |
| 15 | EGR temperature sensor | — | W43 | — | 0.5 | P8-C1-45 | — | — | — |
| 16 | MAF ground | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| 17 | MAF signal | — | W30 | — | 0.5 | P8-C1-25 | — | — | — |
| 2 | Injector 6 (cyl 6) | — | W29 | — | 0.5 | P8-C1-35 | — | — | — |
| 20 | O2 sensor 1 (primary) | — | W42 | — | 0.5 | P8-C1-12 | — | — | — |
| 21 | Diagnostic L-line | — | — | — | — | — | — | — | — |
| 22 | Tachometer output | — | W40 | — | 0.5 | P8-C1-24 | — | — | — |
| 23 | ECU main power (from engine-electronics relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 24 | Injector 1 (cyl 1) | — | W24 | — | 0.5 | P8-C1-37 | — | — | — |
| 25 | Injector 5 (cyl 5) | — | W28 | — | 0.5 | P8-C1-17 | — | — | — |
| 26 | Injector 3 (cyl 3) | — | W26 | — | 0.5 | P8-C1-54 | — | — | — |
| 27 | Idle air control valve | — | W36 | — | 0.5 | P8-C1-4 | — | — | — |
| 3 | Injector 2 (cyl 2) | — | W25 | — | 0.5 | P8-C1-18 | — | — | — |
| 31 | EVAP canister purge valve | — | W37 | — | 0.5 | P8-C1-42 | — | — | — |
| 33 | Sensor ground bus | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 34 | Knock sensor 1 | — | — | — | — | — | — | — | — |
| 36 | Intake air temperature (IAT) | — | W44 | — | 0.5 | P8-C1-7 | — | — | — |
| 37 | A/C compressor switch | — | W46 | — | 0.5 | P8-C1-13 | — | — | — |
| 38 | Ignition switch (run/start) | — | — | — | — | — | — | — | — |
| 39 | A/C switch (cabin) | — | W47 | — | 0.5 | P8-C1-14 | — | — | — |
| 4 | Injector 4 (cyl 4) | — | W27 | — | 0.5 | P8-C1-36 | — | — | — |
| 40 | Throttle position sensor 1 | — | W31 | — | 0.5 | P8-C1-48 | — | — | — |
| 41 | TPS power (+5V) | — | W18 | — | 0.5 | P8-C1-10 | — | — | — |
| 43 | Diagnostic K-line | — | — | — | — | — | — | — | — |
| 44 | Camshaft position sensor (G40) | — | W20 | — | 0.5 | P8-C1-27 | — | — | — |
| 49 | Secondary air injection relay control | — | W33 | — | 0.5 | P8-C1-41 | — | — | — |
| 5 | Check engine light (MIL) | — | W38 | — | 0.5 | P8-C1-6 | — | — | — |
| 51 | MFA fuel-consumption signal | — | W41 | — | 0.5 | P8-C1-23 | — | — | — |
| 52 | Ignition coil 4 (coil pack pin 4) | — | W23 | — | 0.5 | P8-C1-20 | — | — | — |
| 53 | Idle air control valve (2nd) | — | W39 | — | 0.5 | P8-C1-21 | — | — | — |
| 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 | — | W34 | — | 0.5 | P8-C1-5 | — | — | — |
| 60 | Ignition coil 3 (coil pack pin 3) | — | W22 | — | 0.5 | P8-C1-38 | — | — | — |
| 65 | Vehicle speed sensor (VSS) | — | W45 | — | 0.5 | P8-C1-11 | — | — | — |
| 67 | Crank sensor return (VR-) | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 68 | Crank position sensor (G28, VR+) | — | W19 | — | 0.5 | P8-C1-8 | — | — | — |
| 7 | Ground (E-2) | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 8 | Ignition coil 2 (coil pack pin 2) | — | W21 | — | 0.5 | P8-C1-1 | — | — | — |
| 9 | Engine electronics relay control | — | W35 | — | 0.5 | P8-C1-43 | — | — | — |
P8-C1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Coil 1 | — | W21 | — | 0.5 | OEM-A-8 | — | — | — |
| 10 | 5 Volts | — | W18 | — | 0.5 | OEM-A-41 | — | — | — |
| 11 | Undriven Wheel (must) | — | W45 | — | 0.5 | OEM-A-65 | — | — | — |
| 12 | Lambda Signal | — | W42 | — | 0.5 | OEM-A-20 | — | — | — |
| 13 | Map2/ALS/Ana1 On/Off | — | W46 | — | 0.5 | OEM-A-37 | — | — | — |
| 14 | Traction Wet/Dry | — | W47 | — | 0.5 | OEM-A-39 | — | — | — |
| 15 | Power Ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 16 | Injector 8 | — | — | — | — | — | — | — | — |
| 17 | Injector 5 | — | W28 | — | 0.5 | OEM-A-25 | — | — | — |
| 18 | Injector 2 | — | W25 | — | 0.5 | OEM-A-3 | — | — | — |
| 19 | 12 Volts | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 2 | Coil 4 | — | — | — | — | — | — | — | — |
| 20 | Coil 3 | — | W23 | — | 0.5 | OEM-A-52 | — | — | — |
| 21 | Turbo Pressure Valve | — | W39 | — | 0.5 | OEM-A-53 | — | — | — |
| 22 | Coil 8/or Aux5 | — | — | — | — | — | — | — | — |
| 23 | Turbo ALS Valve | — | W41 | — | 0.5 | OEM-A-51 | — | — | — |
| 24 | Tacho | — | W40 | — | 0.5 | OEM-A-22 | — | — | — |
| 25 | Analogue Input 1 | — | W30 | — | 0.5 | OEM-A-17 | — | — | — |
| 26 | Water Temp | — | W32 | — | 0.5 | OEM-A-14 | — | — | — |
| 27 | Cam Sensor | — | W20 | — | 0.5 | OEM-A-44 | — | — | — |
| 28 | 5 Volts | — | — | — | — | — | — | — | — |
| 29 | Left Driven Wheel | — | — | — | — | — | — | — | — |
| 3 | Coil 6 | — | — | — | — | — | — | — | — |
| 30 | Map | — | — | — | — | — | — | — | — |
| 31 | Launch Button | — | — | — | — | — | — | — | — |
| 32 | Traction On/Off | — | — | — | — | — | — | — | — |
| 33 | Shift Cut | — | — | — | — | — | — | — | — |
| 34 | Power Ground | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| 35 | Injector 6 | — | W29 | — | 0.5 | OEM-A-2 | — | — | — |
| 36 | Injector 4 | — | W27 | — | 0.5 | OEM-A-4 | — | — | — |
| 37 | Injector 1 | — | W24 | — | 0.5 | OEM-A-24 | — | — | — |
| 38 | Coil 2 | — | W22 | — | 0.5 | OEM-A-60 | — | — | — |
| 39 | Coil 5 | — | — | — | — | — | — | — | — |
| 4 | Idle Valve | — | W36 | — | 0.5 | OEM-A-27 | — | — | — |
| 40 | Coil 7 | — | — | — | — | — | — | — | — |
| 41 | Fuel Pump Relay | — | W33 | — | 0.5 | OEM-A-49 | — | — | — |
| 42 | Cam Phase Valve/Aux Out 4 | — | W37 | — | 0.5 | OEM-A-31 | — | — | — |
| 43 | Aux Out 3 | — | W35 | — | 0.5 | OEM-A-9 | — | — | — |
| 44 | Analogue Input 3 | — | — | — | — | — | — | — | — |
| 45 | Air Temp | — | W43 | — | 0.5 | OEM-A-15 | — | — | — |
| 46 | Signal Ground | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 47 | Signal Ground | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 48 | Throttle Wiper | — | W31 | — | 0.5 | OEM-A-40 | — | — | — |
| 49 | Lambda Earth | — | W16 | — | 0.5 | SP-0V-1 | — | — | — |
| 5 | Aux Out 2 | — | W34 | — | 0.5 | OEM-A-6 | — | — | — |
| 50 | Undriven Wheel (optional) | — | — | — | — | — | — | — | — |
| 51 | Signal Ground | — | W17 | — | 0.5 | SP-0V-1 | — | — | — |
| 52 | 5 Volts | — | — | — | — | — | — | — | — |
| 53 | Injector 7 | — | — | — | — | — | — | — | — |
| 54 | Injector 3 | — | W26 | — | 0.5 | OEM-A-26 | — | — | — |
| 55 | Power Ground | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
| 6 | Shift Light | — | W38 | — | 0.5 | OEM-A-5 | — | — | — |
| 7 | Analogue Input 2 Or Log Switch | — | W44 | — | 0.5 | OEM-A-36 | — | — | — |
| 8 | Crank Sensor | — | W19 | — | 0.5 | OEM-A-68 | — | — | — |
| 9 | Right Driven Wheel | — | — | — | — | — | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W11 | — | 0.5 | OEM-A-16 | — | — | — |
| 1 | — | — | W12 | — | 0.5 | OEM-A-33 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | OEM-A-67 | — | — | — |
| 1 | — | — | W14 | — | 0.5 | P8-C1-46 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | P8-C1-47 | — | — | — |
| 1 | — | — | W16 | — | 0.5 | P8-C1-49 | — | — | — |
| 1 | — | — | W17 | — | 0.5 | P8-C1-51 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-A-23 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | P8-C1-19 | — | — | — |
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 | P8-C1-15 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | P8-C1-34 | — | — | — |
| 1 | — | — | W10 | — | 0.85 | P8-C1-55 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-A-1 | Ground (E-1) | ground | P8-C1-15 + P8-C1-34 + P8-C1-55 | Power Ground + Power Ground + Power Ground | ground | single_source | |
| OEM-A-10 | Ground (OBD1 EGR enable) | ground | P8-C1-15 + P8-C1-34 + P8-C1-55 | Power Ground + Power Ground + Power Ground | ground | single_source | |
| OEM-A-14 | Coolant temperature (CLT) | temp_in | P8-C1-26 | Water Temp | temp_in | single_source | |
| OEM-A-15 | EGR temperature sensor | temp_in | P8-C1-45 | Air Temp | temp_in | single_source | |
| OEM-A-16 | MAF ground | sensor_ground | P8-C1-46 + P8-C1-47 + P8-C1-49 + P8-C1-51 | Signal Ground + Signal Ground + Lambda Earth + Signal Ground | sensor_ground | single_source | |
| OEM-A-17 | MAF signal | analog_in | P8-C1-25 | Analogue Input 1 | analog_in | single_source | |
| OEM-A-2 | Injector 6 (cyl 6) | injector_out | P8-C1-35 | Injector 6 | injector_out | single_source | |
| OEM-A-20 | O2 sensor 1 (primary) | lambda_nb_in | P8-C1-12 | Lambda Signal | lambda_nb_in | single_source | |
| OEM-A-21 | Diagnostic L-line | serial | — | — | — | single_source | |
| OEM-A-22 | Tachometer output | tacho_out | P8-C1-24 | Tacho | tacho_out | single_source | |
| OEM-A-23 | ECU main power (from engine-electronics relay) | power_in | P8-C1-19 | 12 Volts | power_in | single_source | |
| OEM-A-24 | Injector 1 (cyl 1) | injector_out | P8-C1-37 | Injector 1 | injector_out | single_source | |
| OEM-A-25 | Injector 5 (cyl 5) | injector_out | P8-C1-17 | Injector 5 | injector_out | single_source | |
| OEM-A-26 | Injector 3 (cyl 3) | injector_out | P8-C1-54 | Injector 3 | injector_out | single_source | |
| OEM-A-27 | Idle air control valve | low_side_out | P8-C1-4 | Idle Valve | low_side_out | single_source | |
| OEM-A-3 | Injector 2 (cyl 2) | injector_out | P8-C1-18 | Injector 2 | injector_out | single_source | |
| OEM-A-31 | EVAP canister purge valve | low_side_out | P8-C1-42 | Cam Phase Valve/Aux Out 4 | low_side_out | single_source | |
| OEM-A-33 | Sensor ground bus | sensor_ground | P8-C1-46 + P8-C1-47 + P8-C1-49 + P8-C1-51 | Signal Ground + Signal Ground + Lambda Earth + Signal Ground | sensor_ground | single_source | |
| OEM-A-34 | Knock sensor 1 | knock_in | — | — | — | single_source | |
| OEM-A-36 | Intake air temperature (IAT) | temp_in | P8-C1-7 | Analogue Input 2 Or Log Switch | analog_in | single_source | |
| OEM-A-37 | A/C compressor switch | digital_in | P8-C1-13 | Map2/ALS/Ana1 On/Off | digital_in | single_source | |
| OEM-A-38 | Ignition switch (run/start) | digital_in | — | — | — | single_source | |
| OEM-A-39 | A/C switch (cabin) | digital_in | P8-C1-14 | Traction Wet/Dry | digital_in | single_source | |
| OEM-A-4 | Injector 4 (cyl 4) | injector_out | P8-C1-36 | Injector 4 | injector_out | single_source | |
| OEM-A-40 | Throttle position sensor 1 | analog_in | P8-C1-48 | Throttle Wiper | analog_in | single_source | |
| OEM-A-41 | TPS power (+5V) | vref | P8-C1-10 | 5 Volts | vref | single_source | |
| OEM-A-43 | Diagnostic K-line | serial | — | — | — | single_source | |
| OEM-A-44 | Camshaft position sensor (G40) | trigger_in | P8-C1-27 | Cam Sensor | trigger_in | single_source | |
| OEM-A-49 | Secondary air injection relay control | low_side_out | P8-C1-41 | Fuel Pump Relay | low_side_out | single_source | |
| OEM-A-5 | Check engine light (MIL) | low_side_out | P8-C1-6 | Shift Light | low_side_out | single_source | |
| OEM-A-51 | MFA fuel-consumption signal | tacho_out | P8-C1-23 | Turbo ALS Valve | low_side_out | single_source | |
| OEM-A-52 | Ignition coil 4 (coil pack pin 4) | ignition_out | P8-C1-20 | Coil 3 | ignition_out | single_source | |
| OEM-A-53 | Idle air control valve (2nd) | low_side_out | P8-C1-21 | Turbo Pressure Valve | low_side_out | single_source | |
| OEM-A-54 | Battery constant (+12V) | power_in | — | — | — | single_source | |
| OEM-A-55 | Ground (E-3) | ground | P8-C1-15 + P8-C1-34 + P8-C1-55 | Power Ground + Power Ground + Power Ground | ground | single_source | |
| OEM-A-56 | Ground (E-4) | ground | P8-C1-15 + P8-C1-34 + P8-C1-55 | Power Ground + 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 | P8-C1-5 | Aux Out 2 | low_side_out | single_source | |
| OEM-A-60 | Ignition coil 3 (coil pack pin 3) | ignition_out | P8-C1-38 | Coil 2 | ignition_out | single_source | |
| OEM-A-65 | Vehicle speed sensor (VSS) | digital_in | P8-C1-11 | Undriven Wheel (must) | digital_in | single_source | |
| OEM-A-67 | Crank sensor return (VR-) | sensor_ground | P8-C1-46 + P8-C1-47 + P8-C1-49 + P8-C1-51 | Signal Ground + Signal Ground + Lambda Earth + Signal Ground | sensor_ground | single_source | |
| OEM-A-68 | Crank position sensor (G28, VR+) | trigger_in | P8-C1-8 | Crank Sensor | trigger_in | single_source | |
| OEM-A-7 | Ground (E-2) | ground | P8-C1-15 + P8-C1-34 + P8-C1-55 | Power Ground + Power Ground + Power Ground | ground | single_source | |
| OEM-A-8 | Ignition coil 2 (coil pack pin 2) | ignition_out | P8-C1-1 | Coil 1 | ignition_out | single_source | |
| OEM-A-9 | Engine electronics relay control | low_side_out | P8-C1-43 | Aux Out 3 | 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 | P8-C1-19 | 0.85 | no route | 12 Volts | — | |
| 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 | P8-C1-15 | 0.85 | no route | Power Ground | — | |
| W9 | SP-GND-1 | P8-C1-34 | 0.85 | no route | Power Ground | — | |
| W10 | SP-GND-1 | P8-C1-55 | 0.85 | no route | Power Ground | — | |
| W11 | OEM-A-16 | SP-0V-1 | 0.5 | no route | MAF ground | — | |
| W12 | OEM-A-33 | SP-0V-1 | 0.5 | no route | Sensor ground bus | — | |
| W13 | OEM-A-67 | SP-0V-1 | 0.5 | no route | Crank sensor return (VR-) | — | |
| W14 | SP-0V-1 | P8-C1-46 | 0.5 | no route | Signal Ground | — | |
| W15 | SP-0V-1 | P8-C1-47 | 0.5 | no route | Signal Ground | — | |
| W16 | SP-0V-1 | P8-C1-49 | 0.5 | no route | Lambda Earth | — | |
| W17 | SP-0V-1 | P8-C1-51 | 0.5 | no route | Signal Ground | — | |
| W18 | OEM-A-41 | P8-C1-10 | 0.5 | no route | TPS power (+5V) | — | |
| W19 | OEM-A-68 | P8-C1-8 | 0.5 | no route | Crank position sensor (G28, VR+) | — | |
| W20 | OEM-A-44 | P8-C1-27 | 0.5 | no route | Camshaft position sensor (G40) | — | |
| W21 | OEM-A-8 | P8-C1-1 | 0.5 | no route | Ignition coil 2 (coil pack pin 2) | — | |
| W22 | OEM-A-60 | P8-C1-38 | 0.5 | no route | Ignition coil 3 (coil pack pin 3) | — | |
| W23 | OEM-A-52 | P8-C1-20 | 0.5 | no route | Ignition coil 4 (coil pack pin 4) | — | |
| W24 | OEM-A-24 | P8-C1-37 | 0.5 | no route | Injector 1 (cyl 1) | — | |
| W25 | OEM-A-3 | P8-C1-18 | 0.5 | no route | Injector 2 (cyl 2) | — | |
| W26 | OEM-A-26 | P8-C1-54 | 0.5 | no route | Injector 3 (cyl 3) | — | |
| W27 | OEM-A-4 | P8-C1-36 | 0.5 | no route | Injector 4 (cyl 4) | — | |
| W28 | OEM-A-25 | P8-C1-17 | 0.5 | no route | Injector 5 (cyl 5) | — | |
| W29 | OEM-A-2 | P8-C1-35 | 0.5 | no route | Injector 6 (cyl 6) | — | |
| W30 | OEM-A-17 | P8-C1-25 | 0.5 | no route | MAF signal | — | |
| W31 | OEM-A-40 | P8-C1-48 | 0.5 | no route | Throttle position sensor 1 | — | |
| W32 | OEM-A-14 | P8-C1-26 | 0.5 | no route | Coolant temperature (CLT) | — | |
| W33 | OEM-A-49 | P8-C1-41 | 0.5 | no route | Secondary air injection relay control | — | |
| W34 | OEM-A-6 | P8-C1-5 | 0.5 | no route | Fuel pump relay control | — | |
| W35 | OEM-A-9 | P8-C1-43 | 0.5 | no route | Engine electronics relay control | — | |
| W36 | OEM-A-27 | P8-C1-4 | 0.5 | no route | Idle air control valve | — | |
| W37 | OEM-A-31 | P8-C1-42 | 0.5 | no route | EVAP canister purge valve | — | |
| W38 | OEM-A-5 | P8-C1-6 | 0.5 | no route | Check engine light (MIL) | — | |
| W39 | OEM-A-53 | P8-C1-21 | 0.5 | no route | Idle air control valve (2nd) | — | |
| W40 | OEM-A-22 | P8-C1-24 | 0.5 | no route | Tachometer output | — | |
| W41 | OEM-A-51 | P8-C1-23 | 0.5 | no route | MFA fuel-consumption signal | — | |
| W42 | OEM-A-20 | P8-C1-12 | 0.5 | no route | O2 sensor 1 (primary) | — | |
| W43 | OEM-A-15 | P8-C1-45 | 0.5 | no route | EGR temperature sensor | — | |
| W44 | OEM-A-36 | P8-C1-7 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W45 | OEM-A-65 | P8-C1-11 | 0.5 | no route | Vehicle speed sensor (VSS) | — | |
| W46 | OEM-A-37 | P8-C1-13 | 0.5 | no route | A/C compressor switch | — | |
| W47 | OEM-A-39 | P8-C1-14 | 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 (8)
| 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. |
| warn | LOAD_UNKNOWN | P8-C1-41 | P8-C1-41 "Fuel Pump Relay" drives OEM-A-49 Secondary air injection relay control (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | P8-C1-43 | P8-C1-43 "Aux Out 3" drives OEM-A-9 Engine electronics relay control (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | P8-C1-5 | P8-C1-5 "Aux Out 2" drives OEM-A-6 Fuel pump relay control (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| info | NET_FAMILY | OEM-A-36 ↔ P8-C1-7 | OEM-A-36 "Intake air temperature (IAT)" [temp_in] is wired to P8-C1-7 "Analogue Input 2 Or Log Switch" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | NET_FAMILY | OEM-A-51 ↔ P8-C1-23 | OEM-A-51 "MFA fuel-consumption signal" [tacho_out] is wired to P8-C1-23 "Turbo ALS Valve" [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
Fit check: unconfirmed. Confirm these before building: - Knock input count not found 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 DTAFast P8 - 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); DTAFast P8 has no dedicated key-on input Not wired: - OEM-A 54: Battery constant (+12V): DTAFast P8 has no battery-constant input; not needed - OEM-A 21: Diagnostic L-line: no free k_line on DTAFast P8 - OEM-A 43: Diagnostic K-line: no free k_line on DTAFast P8 - 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 | DTAFast P8Pro wiring schematic | https://dtafast.co.uk/pages/ecu-wiring-diagrams | — | — | — |
| 2 | community_copy | a2resource: VR6/ABA Motronic M2.9 (OBD1) engine control unit pinout | http://www.a2resource.com/electrical/management/motronicvr6aba.html | — | — | — |