VW Corrado VR6 12v (AAA) Motronic M2.9 OBD1 → MoTeC M800 universal (auto)
VW Corrado VR6 12v (AAA) Motronic M2.9 OBD1 — MoTeC — M800
⚠ 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 | 44 wires · 6 connectors · 3 part lines |
| Tools | Crimp and extraction tools for each terminal family (see Connectors) · wire strippers · multimeter · heat gun + heat-shrink |
| Terminals | 3-1447221-4 |
| 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 | M800-A-26 | 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 | M800-A-10 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | M800-A-11 | 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 | M800-B-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | SP-0V-1 | M800-B-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | SP-0V-1 | M800-B-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-A-41 | M800-A-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-A-68 | M800-B-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-A-44 | M800-B-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-A-8 | M800-A-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-A-60 | M800-A-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-A-52 | M800-A-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-A-24 | M800-A-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-A-3 | M800-A-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-A-26 | M800-A-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-A-4 | M800-A-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-A-25 | M800-A-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-A-2 | M800-A-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-A-17 | M800-A-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-A-40 | M800-A-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-A-14 | M800-B-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-A-49 | M800-A-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-A-6 | M800-A-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-A-9 | M800-A-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-A-27 | M800-A-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-A-31 | M800-A-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-A-5 | M800-A-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-A-53 | M800-A-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-A-22 | M800-A-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-A-20 | M800-A-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-A-15 | M800-B-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-A-36 | M800-B-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-A-65 | M800-B-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-A-37 | M800-B-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-A-39 | M800-B-10 | 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 | M800-A-10 | M800-A-2 | open (OL) | power ground must not touch 5 V sensor reference | |
| 2 | M800-A-10 | M800-A-26 | open (OL) | power ground must not touch +12 V supply | |
| 3 | M800-A-26 | M800-A-2 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 4 | M800-B-14 | M800-A-2 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 5 | M800-B-14 | M800-A-26 | 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
M800-A
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | AUX2 | — | W32 | — | 0.5 | OEM-A-6 | — | — | — |
| 2 | 5V Engine Sensor Supply | — | W16 | — | 0.5 | OEM-A-41 | — | — | — |
| 3 | IGN1 | — | W19 | — | 0.5 | OEM-A-8 | — | — | — |
| 4 | IGN2 | — | W20 | — | 0.5 | OEM-A-60 | — | — | — |
| 5 | IGN3 | — | W21 | — | 0.5 | OEM-A-52 | — | — | — |
| 6 | IGN4 | — | — | — | — | — | — | — | — |
| 7 | IGN5 | — | — | — | — | — | — | — | — |
| 8 | IGN6 | — | — | — | — | — | — | — | — |
| 9 | 5V Auxiliary Sensor Supply | — | — | — | — | — | — | — | — |
| 10 | GND Battery Negative | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 11 | GND Battery Negative | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| 12 | 8V Engine Sensor Supply | — | — | — | — | — | — | — | — |
| 13 | 8V Auxiliary Sensor and CAN Supply | — | — | — | — | — | — | — | — |
| 14 | AV1 | — | W28 | — | 0.5 | OEM-A-17 | — | — | — |
| 15 | Analog Voltage Input 2 | — | W29 | — | 0.5 | OEM-A-40 | — | — | — |
| 16 | Analog Voltage Input 3 | — | W39 | — | 0.5 | OEM-A-20 | — | — | — |
| 17 | Analog Voltage Input 4 | — | — | — | — | — | — | — | — |
| 18 | AUX1 | — | W31 | — | 0.5 | OEM-A-49 | — | — | — |
| 19 | INJ1 | — | W22 | — | 0.5 | OEM-A-24 | — | — | — |
| 20 | INJ2 | — | W23 | — | 0.5 | OEM-A-3 | — | — | — |
| 21 | INJ3 | — | W24 | — | 0.5 | OEM-A-26 | — | — | — |
| 22 | INJ4 | — | W25 | — | 0.5 | OEM-A-4 | — | — | — |
| 23 | AUX3 | — | W33 | — | 0.5 | OEM-A-9 | — | — | — |
| 24 | AUX4 | — | W34 | — | 0.5 | OEM-A-27 | — | — | — |
| 25 | Analog Voltage Input 5 | — | — | — | — | — | — | — | — |
| 26 | VBAT Battery Positive | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 27 | INJ5 | — | W26 | — | 0.5 | OEM-A-25 | — | — | — |
| 28 | INJ6 | — | W27 | — | 0.5 | OEM-A-2 | — | — | — |
| 29 | INJ7 | — | — | — | — | — | — | — | — |
| 30 | INJ8 | — | — | — | — | — | — | — | — |
| 31 | AUX5 | — | W35 | — | 0.5 | OEM-A-31 | — | — | — |
| 32 | AUX6 | — | W36 | — | 0.5 | OEM-A-5 | — | — | — |
| 33 | AUX7 | — | W37 | — | 0.5 | OEM-A-53 | — | — | — |
| 34 | AUX8 | — | W38 | — | 0.5 | OEM-A-22 | — | — | — |
M800-B
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Crank Reference Timing Input | — | W17 | — | 0.5 | OEM-A-68 | — | — | — |
| 2 | Cam Sync Timing Input | — | W18 | — | 0.5 | OEM-A-44 | — | — | — |
| 3 | Analog Temperature Input 1 | — | W30 | — | 0.5 | OEM-A-14 | — | — | — |
| 4 | Analog Temperature Input 2 | — | W40 | — | 0.5 | OEM-A-15 | — | — | — |
| 5 | Analog Temperature Input 3 | — | W41 | — | 0.5 | OEM-A-36 | — | — | — |
| 6 | Analog Temperature Input 4 | — | — | — | — | — | — | — | — |
| 7 | Analog Temperature Input 5 | — | — | — | — | — | — | — | — |
| 8 | Digital Input 1 | — | W42 | — | 0.5 | OEM-A-65 | — | — | — |
| 9 | Digital Input 2 | — | W43 | — | 0.5 | OEM-A-37 | — | — | — |
| 10 | Digital Input 3 | — | W44 | — | 0.5 | OEM-A-39 | — | — | — |
| 11 | Digital Input 4 | — | — | — | — | — | — | — | — |
| 12 | Lambda2 Sense Voltage | — | — | — | — | — | — | — | — |
| 13 | Lambda2 Pump Current | — | — | — | — | — | — | — | — |
| 14 | 0V Comms Reference | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 15 | 0V Auxiliary Sensor Supply | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 16 | 0V Engine Sensor Supply | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 17 | RS232 Transmit Data | — | — | — | — | — | — | — | — |
| 18 | RS232 Receive Data | — | — | — | — | — | — | — | — |
| 19 | Analog Temperature Input 6 | — | — | — | — | — | — | — | — |
| 20 | Analog Voltage Input 6 | — | — | — | — | — | — | — | — |
| 21 | AV7 | — | — | — | — | — | — | — | — |
| 22 | AV8 | — | — | — | — | — | — | — | — |
| 23 | CAN Bus High | — | — | — | — | — | — | — | — |
| 24 | CAN Bus Low | — | — | — | — | — | — | — | — |
| 25 | Lambda1 Sense Voltage | — | — | — | — | — | — | — | — |
| 26 | Lambda1 Pump Current | — | — | — | — | — | — | — | — |
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) | — | W30 | — | 0.5 | M800-B-3 | — | — | — |
| 15 | EGR temperature sensor | — | W40 | — | 0.5 | M800-B-4 | — | — | — |
| 16 | MAF ground | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| 17 | MAF signal | — | W28 | — | 0.5 | M800-A-14 | — | — | — |
| 2 | Injector 6 (cyl 6) | — | W27 | — | 0.5 | M800-A-28 | — | — | — |
| 20 | O2 sensor 1 (primary) | — | W39 | — | 0.5 | M800-A-16 | — | — | — |
| 21 | Diagnostic L-line | — | — | — | — | — | — | — | — |
| 22 | Tachometer output | — | W38 | — | 0.5 | M800-A-34 | — | — | — |
| 23 | ECU main power (from engine-electronics relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 24 | Injector 1 (cyl 1) | — | W22 | — | 0.5 | M800-A-19 | — | — | — |
| 25 | Injector 5 (cyl 5) | — | W26 | — | 0.5 | M800-A-27 | — | — | — |
| 26 | Injector 3 (cyl 3) | — | W24 | — | 0.5 | M800-A-21 | — | — | — |
| 27 | Idle air control valve | — | W34 | — | 0.5 | M800-A-24 | — | — | — |
| 3 | Injector 2 (cyl 2) | — | W23 | — | 0.5 | M800-A-20 | — | — | — |
| 31 | EVAP canister purge valve | — | W35 | — | 0.5 | M800-A-31 | — | — | — |
| 33 | Sensor ground bus | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| 34 | Knock sensor 1 | — | — | — | — | — | — | — | — |
| 36 | Intake air temperature (IAT) | — | W41 | — | 0.5 | M800-B-5 | — | — | — |
| 37 | A/C compressor switch | — | W43 | — | 0.5 | M800-B-9 | — | — | — |
| 38 | Ignition switch (run/start) | — | — | — | — | — | — | — | — |
| 39 | A/C switch (cabin) | — | W44 | — | 0.5 | M800-B-10 | — | — | — |
| 4 | Injector 4 (cyl 4) | — | W25 | — | 0.5 | M800-A-22 | — | — | — |
| 40 | Throttle position sensor 1 | — | W29 | — | 0.5 | M800-A-15 | — | — | — |
| 41 | TPS power (+5V) | — | W16 | — | 0.5 | M800-A-2 | — | — | — |
| 43 | Diagnostic K-line | — | — | — | — | — | — | — | — |
| 44 | Camshaft position sensor (G40) | — | W18 | — | 0.5 | M800-B-2 | — | — | — |
| 49 | Secondary air injection relay control | — | W31 | — | 0.5 | M800-A-18 | — | — | — |
| 5 | Check engine light (MIL) | — | W36 | — | 0.5 | M800-A-32 | — | — | — |
| 51 | MFA fuel-consumption signal | — | — | — | — | — | — | — | — |
| 52 | Ignition coil 4 (coil pack pin 4) | — | W21 | — | 0.5 | M800-A-5 | — | — | — |
| 53 | Idle air control valve (2nd) | — | W37 | — | 0.5 | M800-A-33 | — | — | — |
| 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 | — | W32 | — | 0.5 | M800-A-1 | — | — | — |
| 60 | Ignition coil 3 (coil pack pin 3) | — | W20 | — | 0.5 | M800-A-4 | — | — | — |
| 65 | Vehicle speed sensor (VSS) | — | W42 | — | 0.5 | M800-B-8 | — | — | — |
| 67 | Crank sensor return (VR-) | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 68 | Crank position sensor (G28, VR+) | — | W17 | — | 0.5 | M800-B-1 | — | — | — |
| 7 | Ground (E-2) | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 8 | Ignition coil 2 (coil pack pin 2) | — | W19 | — | 0.5 | M800-A-3 | — | — | — |
| 9 | Engine electronics relay control | — | W33 | — | 0.5 | M800-A-23 | — | — | — |
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 | M800-B-14 | — | — | — |
| 1 | — | — | W14 | — | 0.5 | M800-B-15 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | M800-B-16 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-A-23 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | M800-A-26 | — | — | — |
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 | M800-A-10 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | M800-A-11 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-A-1 | Ground (E-1) | ground | M800-A-10 + M800-A-11 | GND Battery Negative + GND Battery Negative | ground | single_source | |
| OEM-A-10 | Ground (OBD1 EGR enable) | ground | M800-A-10 + M800-A-11 | GND Battery Negative + GND Battery Negative | ground | single_source | |
| OEM-A-14 | Coolant temperature (CLT) | temp_in | M800-B-3 | Analog Temperature Input 1 | temp_in | single_source | |
| OEM-A-15 | EGR temperature sensor | temp_in | M800-B-4 | Analog Temperature Input 2 | temp_in | single_source | |
| OEM-A-16 | MAF ground | sensor_ground | M800-B-14 + M800-B-15 + M800-B-16 | 0V Comms Reference + 0V Auxiliary Sensor Supply + 0V Engine Sensor Supply | sensor_ground | single_source | |
| OEM-A-17 | MAF signal | analog_in | M800-A-14 | AV1 | analog_in | single_source | |
| OEM-A-2 | Injector 6 (cyl 6) | injector_out | M800-A-28 | INJ6 | injector_out | single_source | |
| OEM-A-20 | O2 sensor 1 (primary) | lambda_nb_in | M800-A-16 | Analog Voltage Input 3 | analog_in | single_source | |
| OEM-A-21 | Diagnostic L-line | serial | — | — | — | single_source | |
| OEM-A-22 | Tachometer output | tacho_out | M800-A-34 | AUX8 | switch_out | single_source | |
| OEM-A-23 | ECU main power (from engine-electronics relay) | power_in | M800-A-26 | VBAT Battery Positive | power_in | single_source | |
| OEM-A-24 | Injector 1 (cyl 1) | injector_out | M800-A-19 | INJ1 | injector_out | single_source | |
| OEM-A-25 | Injector 5 (cyl 5) | injector_out | M800-A-27 | INJ5 | injector_out | single_source | |
| OEM-A-26 | Injector 3 (cyl 3) | injector_out | M800-A-21 | INJ3 | injector_out | single_source | |
| OEM-A-27 | Idle air control valve | low_side_out | M800-A-24 | AUX4 | switch_out | single_source | |
| OEM-A-3 | Injector 2 (cyl 2) | injector_out | M800-A-20 | INJ2 | injector_out | single_source | |
| OEM-A-31 | EVAP canister purge valve | low_side_out | M800-A-31 | AUX5 | switch_out | single_source | |
| OEM-A-33 | Sensor ground bus | sensor_ground | M800-B-14 + M800-B-15 + M800-B-16 | 0V Comms Reference + 0V Auxiliary Sensor Supply + 0V Engine Sensor Supply | sensor_ground | single_source | |
| OEM-A-34 | Knock sensor 1 | knock_in | — | — | — | single_source | |
| OEM-A-36 | Intake air temperature (IAT) | temp_in | M800-B-5 | Analog Temperature Input 3 | temp_in | single_source | |
| OEM-A-37 | A/C compressor switch | digital_in | M800-B-9 | Digital Input 2 | digital_in | single_source | |
| OEM-A-38 | Ignition switch (run/start) | digital_in | — | — | — | single_source | |
| OEM-A-39 | A/C switch (cabin) | digital_in | M800-B-10 | Digital Input 3 | digital_in | single_source | |
| OEM-A-4 | Injector 4 (cyl 4) | injector_out | M800-A-22 | INJ4 | injector_out | single_source | |
| OEM-A-40 | Throttle position sensor 1 | analog_in | M800-A-15 | Analog Voltage Input 2 | analog_in | single_source | |
| OEM-A-41 | TPS power (+5V) | vref | M800-A-2 | 5V Engine Sensor Supply | vref | single_source | |
| OEM-A-43 | Diagnostic K-line | serial | — | — | — | single_source | |
| OEM-A-44 | Camshaft position sensor (G40) | trigger_in | M800-B-2 | Cam Sync Timing Input | trigger_in | single_source | |
| OEM-A-49 | Secondary air injection relay control | low_side_out | M800-A-18 | AUX1 | switch_out | single_source | |
| OEM-A-5 | Check engine light (MIL) | low_side_out | M800-A-32 | AUX6 | switch_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 | M800-A-5 | IGN3 | ignition_out | single_source | |
| OEM-A-53 | Idle air control valve (2nd) | low_side_out | M800-A-33 | AUX7 | switch_out | single_source | |
| OEM-A-54 | Battery constant (+12V) | power_in | — | — | — | single_source | |
| OEM-A-55 | Ground (E-3) | ground | M800-A-10 + M800-A-11 | GND Battery Negative + GND Battery Negative | ground | single_source | |
| OEM-A-56 | Ground (E-4) | ground | M800-A-10 + M800-A-11 | GND Battery Negative + GND Battery Negative | 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 | M800-A-1 | AUX2 | switch_out | single_source | |
| OEM-A-60 | Ignition coil 3 (coil pack pin 3) | ignition_out | M800-A-4 | IGN2 | ignition_out | single_source | |
| OEM-A-65 | Vehicle speed sensor (VSS) | digital_in | M800-B-8 | Digital Input 1 | digital_in | single_source | |
| OEM-A-67 | Crank sensor return (VR-) | sensor_ground | M800-B-14 + M800-B-15 + M800-B-16 | 0V Comms Reference + 0V Auxiliary Sensor Supply + 0V Engine Sensor Supply | sensor_ground | single_source | |
| OEM-A-68 | Crank position sensor (G28, VR+) | trigger_in | M800-B-1 | Crank Reference Timing Input | trigger_in | single_source | |
| OEM-A-7 | Ground (E-2) | ground | M800-A-10 + M800-A-11 | GND Battery Negative + GND Battery Negative | ground | single_source | |
| OEM-A-8 | Ignition coil 2 (coil pack pin 2) | ignition_out | M800-A-3 | IGN1 | ignition_out | single_source | |
| OEM-A-9 | Engine electronics relay control | low_side_out | M800-A-23 | AUX3 | switch_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 | M800-A-26 | 0.85 | no route | VBAT Battery Positive | — | |
| 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 | M800-A-10 | 0.85 | no route | GND Battery Negative | — | |
| W9 | SP-GND-1 | M800-A-11 | 0.85 | no route | GND Battery Negative | — | |
| 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 | M800-B-14 | 0.5 | no route | 0V Comms Reference | — | |
| W14 | SP-0V-1 | M800-B-15 | 0.5 | no route | 0V Auxiliary Sensor Supply | — | |
| W15 | SP-0V-1 | M800-B-16 | 0.5 | no route | 0V Engine Sensor Supply | — | |
| W16 | OEM-A-41 | M800-A-2 | 0.5 | no route | TPS power (+5V) | — | |
| W17 | OEM-A-68 | M800-B-1 | 0.5 | no route | Crank position sensor (G28, VR+) | — | |
| W18 | OEM-A-44 | M800-B-2 | 0.5 | no route | Camshaft position sensor (G40) | — | |
| W19 | OEM-A-8 | M800-A-3 | 0.5 | no route | Ignition coil 2 (coil pack pin 2) | — | |
| W20 | OEM-A-60 | M800-A-4 | 0.5 | no route | Ignition coil 3 (coil pack pin 3) | — | |
| W21 | OEM-A-52 | M800-A-5 | 0.5 | no route | Ignition coil 4 (coil pack pin 4) | — | |
| W22 | OEM-A-24 | M800-A-19 | 0.5 | no route | Injector 1 (cyl 1) | — | |
| W23 | OEM-A-3 | M800-A-20 | 0.5 | no route | Injector 2 (cyl 2) | — | |
| W24 | OEM-A-26 | M800-A-21 | 0.5 | no route | Injector 3 (cyl 3) | — | |
| W25 | OEM-A-4 | M800-A-22 | 0.5 | no route | Injector 4 (cyl 4) | — | |
| W26 | OEM-A-25 | M800-A-27 | 0.5 | no route | Injector 5 (cyl 5) | — | |
| W27 | OEM-A-2 | M800-A-28 | 0.5 | no route | Injector 6 (cyl 6) | — | |
| W28 | OEM-A-17 | M800-A-14 | 0.5 | no route | MAF signal | — | |
| W29 | OEM-A-40 | M800-A-15 | 0.5 | no route | Throttle position sensor 1 | — | |
| W30 | OEM-A-14 | M800-B-3 | 0.5 | no route | Coolant temperature (CLT) | — | |
| W31 | OEM-A-49 | M800-A-18 | 0.5 | no route | Secondary air injection relay control | — | |
| W32 | OEM-A-6 | M800-A-1 | 0.5 | no route | Fuel pump relay control | — | |
| W33 | OEM-A-9 | M800-A-23 | 0.5 | no route | Engine electronics relay control | — | |
| W34 | OEM-A-27 | M800-A-24 | 0.5 | no route | Idle air control valve | — | |
| W35 | OEM-A-31 | M800-A-31 | 0.5 | no route | EVAP canister purge valve | — | |
| W36 | OEM-A-5 | M800-A-32 | 0.5 | no route | Check engine light (MIL) | — | |
| W37 | OEM-A-53 | M800-A-33 | 0.5 | no route | Idle air control valve (2nd) | — | |
| W38 | OEM-A-22 | M800-A-34 | 0.5 | no route | Tachometer output | — | |
| W39 | OEM-A-20 | M800-A-16 | 0.5 | no route | O2 sensor 1 (primary) | — | |
| W40 | OEM-A-15 | M800-B-4 | 0.5 | no route | EGR temperature sensor | — | |
| W41 | OEM-A-36 | M800-B-5 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W42 | OEM-A-65 | M800-B-8 | 0.5 | no route | Vehicle speed sensor (VSS) | — | |
| W43 | OEM-A-37 | M800-B-9 | 0.5 | no route | A/C compressor switch | — | |
| W44 | OEM-A-39 | M800-B-10 | 0.5 | no route | A/C switch (cabin) | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|---|---|---|---|---|
| connector | 3-1437290-7 | TE | Superseal 1.0 26-way plug | 1.000 | ea |
| connector | 4-1437290-0 | TE | Superseal 1.0 34-way plug, Key 1 | 1.000 | ea |
| terminal | 3-1447221-4 | TE | Superseal 1.0 socket terminal, 20 AWG (0.5 sq mm) | 35.000 | ea |
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| No configured channels. | |||||||
Findings
Open (14)
| 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 | M800-A-1 | M800-A-1 "AUX2" drives OEM-A-6 Fuel pump relay control (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | M800-A-18 | M800-A-18 "AUX1" 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 | M800-A-23 | M800-A-23 "AUX3" drives OEM-A-9 Engine electronics relay control (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| info | NET_FAMILY | OEM-A-22 ↔ M800-A-34 | OEM-A-22 "Tachometer output" [tacho_out] is wired to M800-A-34 "AUX8" [switch_out]. Frequency output on a general output: set it up as a tacho/frequency output with the right pull-up. |
| info | NET_FAMILY | OEM-A-27 ↔ M800-A-24 | OEM-A-27 "Idle air control valve" [low_side_out] is wired to M800-A-24 "AUX4" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-A-31 ↔ M800-A-31 | OEM-A-31 "EVAP canister purge valve" [low_side_out] is wired to M800-A-31 "AUX5" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-A-49 ↔ M800-A-18 | OEM-A-49 "Secondary air injection relay control" [low_side_out] is wired to M800-A-18 "AUX1" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-A-5 ↔ M800-A-32 | OEM-A-5 "Check engine light (MIL)" [low_side_out] is wired to M800-A-32 "AUX6" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-A-53 ↔ M800-A-33 | OEM-A-53 "Idle air control valve (2nd)" [low_side_out] is wired to M800-A-33 "AUX7" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-A-6 ↔ M800-A-1 | OEM-A-6 "Fuel pump relay control" [low_side_out] is wired to M800-A-1 "AUX2" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-A-9 ↔ M800-A-23 | OEM-A-9 "Engine electronics relay control" [low_side_out] is wired to M800-A-23 "AUX3" [switch_out]. Configure this output as low side. |
| info | UNMAPPED | OEM | 4 optional OEM pins are not mapped: OEM-A-21 Diagnostic L-line; 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
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 MoTeC M800 - 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); MoTeC M800 has no dedicated key-on input Not wired: - OEM-A 54: Battery constant (+12V): MoTeC M800 has no battery-constant input; not needed - OEM-A 51: MFA fuel-consumption signal: no free tacho/frequency_out/low_side/ls_hs on MoTeC M800 - OEM-A 21: Diagnostic L-line: no free k_line on MoTeC M800 - OEM-A 43: Diagnostic K-line: no free k_line on MoTeC M800 - 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 | MoTeC M400/M600/M800/M880 Manual — Appendix L: Pin list by Function | https://starracecars.com/wp-content/uploads/resources/M400_M600_M800_M880_Manual_A5.pdf | archive | 2026-10-05 | b69bb8ffb674 |
| 4 | vendor_doc | MoTeC M800 OEM WRX56 Installation | https://motec.com.au | archive | 2026-10-05 | 2ca4be92bb65 |
| 2 | community_copy | a2resource: VR6/ABA Motronic M2.9 (OBD1) engine control unit pinout | http://www.a2resource.com/electrical/management/motronicvr6aba.html | — | — | — |