VW Golf/Jetta Mk2 1.8 8v Digifant II → rusEFI Proteus (auto)
VW Golf/Jetta Mk2 1.8 8v Digifant II — rusEFI — Proteus
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 2026-10-19
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 | 1: read the Findings page before cutting any wire |
| Size of the job | 42 wires · 10 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-14 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | NEW-KEYON-1 | MAIN-R-COIL+ | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | NEW-BATT-1 | MAIN-R-IN | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | MAIN-R-COIL- | SP-GND-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | MAIN-R-OUT | PROTEUS-Black23-23 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-A-13 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-A-19 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | PROTEUS-Black23-14 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | PROTEUS-Black23-19 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-GND-1 | PROTEUS-Black23-20 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-GND-1 | PROTEUS-Black35-17 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | SP-GND-1 | PROTEUS-Black35-18 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | SP-GND-1 | PROTEUS-Black35-24 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-A-5 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-A-6 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | SP-0V-1 | PROTEUS-White35-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | SP-0V-1 | PROTEUS-White35-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | SP-0V-1 | PROTEUS-White35-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | SP-0V-1 | PROTEUS-White35-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | SP-0V-1 | PROTEUS-White35-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | SP-0V-1 | PROTEUS-White35-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | SP-0V-1 | PROTEUS-White35-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | SP-0V-1 | PROTEUS-White35-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | SP-0V-1 | PROTEUS-White35-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | SP-0V-1 | PROTEUS-White35-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-A-17 | PROTEUS-White35-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-A-8 | SP-14V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-A-18 | PROTEUS-Black23-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-A-4 | PROTEUS-White35-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-A-25 | PROTEUS-Black35-35 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-A-12 | PROTEUS-Black35-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-A-3 | PROTEUS-Black35-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-A-21 | PROTEUS-White35-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-A-10 | PROTEUS-White35-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-A-22 | PROTEUS-Black35-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-A-23 | PROTEUS-Black35-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-A-2 | PROTEUS-White35-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-A-9 | PROTEUS-White35-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-A-1 | PROTEUS-Black23-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-A-11 | PROTEUS-Black23-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-A-16 | PROTEUS-Black23-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | NEW-KEYON-1 | PROTEUS-Black23-18 | 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 | OEM-A-14 | PROTEUS-White35-1 | open (OL) | +12 V supply must not touch sensor ground | |
| 2 | PROTEUS-White35-10 | PROTEUS-White35-1 | open (OL) | 5 V sensor reference must not touch sensor ground | |
| 3 | MAIN-R-COIL- | MAIN-R-OUT | open (OL) | power ground must not touch +12 V supply | |
| 4 | MAIN-R-COIL- | NEW-BATT-1 | open (OL) | power ground must not touch +12 V supply | |
| 5 | MAIN-R-COIL- | NEW-KEYON-1 | open (OL) | power ground must not touch +12 V supply | |
| 6 | MAIN-R-COIL- | OEM-A-14 | open (OL) | power ground must not touch +12 V supply | |
| 7 | MAIN-R-COIL- | PROTEUS-White35-10 | open (OL) | power ground must not touch 5 V sensor reference | |
| 8 | OEM-A-14 | PROTEUS-White35-10 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 9 | PROTEUS-White35-1 | MAIN-R-OUT | open (OL) | sensor ground must not touch +12 V supply | |
| 10 | PROTEUS-White35-1 | NEW-BATT-1 | open (OL) | sensor ground must not touch +12 V supply | |
| 11 | PROTEUS-White35-1 | NEW-KEYON-1 | open (OL) | sensor ground must not touch +12 V supply | |
| 12 | PROTEUS-White35-10 | MAIN-R-OUT | open (OL) | 5 V sensor reference must not touch +12 V supply | |
| 13 | PROTEUS-White35-10 | NEW-BATT-1 | open (OL) | 5 V sensor reference must not touch +12 V supply | |
| 14 | PROTEUS-White35-10 | NEW-KEYON-1 | open (OL) | 5 V sensor reference 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
MAIN-R
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| COIL+ | Relay coil positive (ignition-switched +12V) | — | W2 | — | 0.5 | NEW-KEYON-1 | — | — | — |
| COIL- | Relay coil negative (ECU low-side driver) | — | W4 | — | 0.5 | SP-GND-1 | — | — | — |
| IN | Relay contact input (battery + via main fuse) | — | W3 | — | 0.85 | NEW-BATT-1 | — | — | — |
| OUT | Relay contact output (switched +12V bus) | — | W5 | — | 0.85 | PROTEUS-Black23-23 | — | — | — |
NEW-BATT
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W3 | — | 0.85 | MAIN-R-IN | — | — | — |
NEW-KEYON
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W2 | — | 0.5 | MAIN-R-COIL+ | — | — | — |
| 1 | — | — | W42 | — | 0.5 | PROTEUS-Black23-18 | — | — | — |
OEM-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Starter signal (term 50) | — | W39 | — | 0.5 | PROTEUS-Black23-10 | — | — | — |
| 10 | Coolant temperature sensor | — | W34 | — | 0.5 | PROTEUS-White35-20 | — | — | — |
| 11 | Idle/WOT throttle switch | — | W40 | — | 0.5 | PROTEUS-Black23-3 | — | — | — |
| 12 | Injector driver (batch, all 4) | — | W31 | — | 0.5 | PROTEUS-Black35-3 | — | — | — |
| 13 | Ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 14 | ECU power (control-unit relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 16 | A/C compressor signal | — | W41 | — | 0.5 | PROTEUS-Black23-9 | — | — | — |
| 17 | AFM potentiometer supply | — | W26 | — | 0.5 | PROTEUS-White35-10 | — | — | — |
| 18 | Hall sender signal (engine speed) | — | W28 | — | 0.5 | PROTEUS-Black23-1 | — | — | — |
| 19 | Ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 2 | Oxygen (lambda) sensor signal | — | W37 | — | 0.5 | PROTEUS-White35-24 | — | — | — |
| 21 | AFM signal | — | W33 | — | 0.5 | PROTEUS-White35-13 | — | — | — |
| 22 | Idle stabilizer valve coil 1 | — | W35 | — | 0.5 | PROTEUS-Black35-9 | — | — | — |
| 23 | Idle stabilizer valve coil 2 | — | W36 | — | 0.5 | PROTEUS-Black35-21 | — | — | — |
| 25 | Ignition timing signal to TCI | — | W30 | — | 0.5 | PROTEUS-Black35-35 | — | — | — |
| 3 | Fuel pump relay control | — | W32 | — | 0.5 | PROTEUS-Black35-20 | — | — | — |
| 4 | Knock sensor signal | — | W29 | — | 0.5 | PROTEUS-White35-34 | — | — | — |
| 5 | Knock sensor return | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 6 | Sensor ground (CTS/Hall/AFM/throttle) | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 7 | Knock sensor shield | — | — | — | — | — | — | — | — |
| 8 | Hall sender supply (distributor) | — | W27 | — | 0.5 | SP-14V-1 | — | — | — |
| 9 | Intake air temperature sensor | — | W38 | — | 0.5 | PROTEUS-White35-30 | — | — | — |
PROTEUS-Black23
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Digital 2 | — | W28 | — | 0.5 | OEM-A-18 | — | — | — |
| 10 | Digital 1 | — | W39 | — | 0.5 | OEM-A-1 | — | — | — |
| 11 | Digital 6 | — | — | — | — | — | — | — | — |
| 12 | VR 2 negative | — | — | — | — | — | — | — | — |
| 13 | VR 1 negative | — | — | — | — | — | — | — | — |
| 14 | Power ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 15 | ETB 2 positive | — | — | — | — | — | — | — | — |
| 16 | CAN 1 Low | — | — | — | — | — | — | — | — |
| 17 | CAN 1 High | — | — | — | — | — | — | — | — |
| 18 | Ignition switch in | — | W42 | — | 0.5 | NEW-KEYON-1 | — | — | — |
| 19 | Power ground | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| 2 | Digital 3 | — | — | — | — | — | — | — | — |
| 20 | Power ground | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
| 21 | CAN 2 Low | — | — | — | — | — | — | — | — |
| 22 | CAN 2 High | — | — | — | — | — | — | — | — |
| 23 | Main relay feed | — | W5 | — | 0.85 | MAIN-R-OUT | — | — | — |
| 3 | Digital 4 | — | W40 | — | 0.5 | OEM-A-11 | — | — | — |
| 4 | VR 2 positive | — | — | — | — | — | — | — | — |
| 5 | VR 1 positive | — | — | — | — | — | — | — | — |
| 6 | ETB 1 negative | — | — | — | — | — | — | — | — |
| 7 | ETB 1 positive | — | — | — | — | — | — | — | — |
| 8 | ETB 2 negative | — | — | — | — | — | — | — | — |
| 9 | Digital 5 | — | W41 | — | 0.5 | OEM-A-16 | — | — | — |
PROTEUS-Black35
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Highside 2 | — | — | — | — | — | — | — | — |
| 10 | Lowside 13 | — | — | — | — | — | — | — | — |
| 11 | Lowside 14 | — | — | — | — | — | — | — | — |
| 12 | Lowside 15 | — | — | — | — | — | — | — | — |
| 13 | Highside 3 | — | — | — | — | — | — | — | — |
| 14 | Highside 4 | — | — | — | — | — | — | — | — |
| 15 | Injector 2 | — | — | — | — | — | — | — | — |
| 16 | Injector 4 | — | — | — | — | — | — | — | — |
| 17 | Power ground | — | W11 | — | 0.85 | SP-GND-1 | — | — | — |
| 18 | Power ground | — | W12 | — | 0.85 | SP-GND-1 | — | — | — |
| 19 | Injector 8 | — | — | — | — | — | — | — | — |
| 2 | Highside 1 | — | — | — | — | — | — | — | — |
| 20 | Lowside 10 | — | W32 | — | 0.5 | OEM-A-3 | — | — | — |
| 21 | Lowside 12 | — | W36 | — | 0.5 | OEM-A-23 | — | — | — |
| 22 | Ignition 3 | — | — | — | — | — | — | — | — |
| 23 | Lowside 16 | — | — | — | — | — | — | — | — |
| 24 | Power ground | — | W13 | — | 0.85 | SP-GND-1 | — | — | — |
| 25 | Ignition 12 | — | — | — | — | — | — | — | — |
| 26 | Ignition 11 | — | — | — | — | — | — | — | — |
| 27 | Ignition 10 | — | — | — | — | — | — | — | — |
| 28 | Ignition 9 | — | — | — | — | — | — | — | — |
| 29 | Ignition 8 | — | — | — | — | — | — | — | — |
| 3 | Injector 1 | — | W31 | — | 0.5 | OEM-A-12 | — | — | — |
| 30 | Ignition 7 | — | — | — | — | — | — | — | — |
| 31 | Ignition 6 | — | — | — | — | — | — | — | — |
| 32 | Ignition 5 | — | — | — | — | — | — | — | — |
| 33 | Ignition 4 | — | — | — | — | — | — | — | — |
| 34 | Ignition 2 | — | — | — | — | — | — | — | — |
| 35 | Ignition 1 | — | W30 | — | 0.5 | OEM-A-25 | — | — | — |
| 4 | Injector 3 | — | — | — | — | — | — | — | — |
| 5 | Injector 5 | — | — | — | — | — | — | — | — |
| 6 | Injector 6 | — | — | — | — | — | — | — | — |
| 7 | Injector 7 | — | — | — | — | — | — | — | — |
| 8 | Injector 9 | — | — | — | — | — | — | — | — |
| 9 | Lowside 11 | — | W35 | — | 0.5 | OEM-A-22 | — | — | — |
PROTEUS-White35
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Sensor ground | — | W16 | — | 0.5 | SP-0V-1 | — | — | — |
| 10 | 5V supply #2 | — | W26 | — | 0.5 | OEM-A-17 | — | — | — |
| 11 | 12V sensor supply | — | — | — | — | — | — | — | — |
| 12 | 12V sensor supply | — | — | — | — | — | — | — | — |
| 13 | Analog Volt 1 | — | W33 | — | 0.5 | OEM-A-21 | — | — | — |
| 14 | Analog Volt 3 | — | — | — | — | — | — | — | — |
| 15 | Analog Volt 5 | — | — | — | — | — | — | — | — |
| 16 | Analog Volt 7 | — | — | — | — | — | — | — | — |
| 17 | Analog Volt 9 | — | — | — | — | — | — | — | — |
| 18 | Analog Volt 11 | — | — | — | — | — | — | — | — |
| 19 | Thermistor 1 | — | — | — | — | — | — | — | — |
| 2 | Sensor ground | — | W17 | — | 0.5 | SP-0V-1 | — | — | — |
| 20 | Coolant temp (CLT) | — | W34 | — | 0.5 | OEM-A-10 | — | — | — |
| 21 | 5V supply #1 | — | — | — | — | — | — | — | — |
| 22 | 5V supply #2 | — | — | — | — | — | — | — | — |
| 23 | Sensor ground | — | W18 | — | 0.5 | SP-0V-1 | — | — | — |
| 24 | Analog Volt 2 | — | W37 | — | 0.5 | OEM-A-2 | — | — | — |
| 25 | Analog Volt 4 | — | — | — | — | — | — | — | — |
| 26 | Analog Volt 6 | — | — | — | — | — | — | — | — |
| 27 | Analog Volt 8 | — | — | — | — | — | — | — | — |
| 28 | Analog Volt 10 | — | — | — | — | — | — | — | — |
| 29 | Sensor ground | — | W19 | — | 0.5 | SP-0V-1 | — | — | — |
| 3 | Sensor ground | — | W20 | — | 0.5 | SP-0V-1 | — | — | — |
| 30 | Intake air temp (IAT) | — | W38 | — | 0.5 | OEM-A-9 | — | — | — |
| 31 | Thermistor 4 | — | — | — | — | — | — | — | — |
| 32 | 5V supply #1 | — | — | — | — | — | — | — | — |
| 33 | 5V supply #2 | — | — | — | — | — | — | — | — |
| 34 | Knock 1 | — | W29 | — | 0.5 | OEM-A-4 | — | — | — |
| 35 | Knock 2 | — | — | — | — | — | — | — | — |
| 4 | Sensor ground | — | W21 | — | 0.5 | SP-0V-1 | — | — | — |
| 5 | Sensor ground | — | W22 | — | 0.5 | SP-0V-1 | — | — | — |
| 6 | Sensor ground | — | W23 | — | 0.5 | SP-0V-1 | — | — | — |
| 7 | Sensor ground | — | W24 | — | 0.5 | SP-0V-1 | — | — | — |
| 8 | Sensor ground | — | W25 | — | 0.5 | SP-0V-1 | — | — | — |
| 9 | 5V supply #1 | — | — | — | — | — | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W14 | — | 0.5 | OEM-A-5 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | OEM-A-6 | — | — | — |
| 1 | — | — | W16 | — | 0.5 | PROTEUS-White35-1 | — | — | — |
| 1 | — | — | W17 | — | 0.5 | PROTEUS-White35-2 | — | — | — |
| 1 | — | — | W18 | — | 0.5 | PROTEUS-White35-23 | — | — | — |
| 1 | — | — | W19 | — | 0.5 | PROTEUS-White35-29 | — | — | — |
| 1 | — | — | W20 | — | 0.5 | PROTEUS-White35-3 | — | — | — |
| 1 | — | — | W21 | — | 0.5 | PROTEUS-White35-4 | — | — | — |
| 1 | — | — | W22 | — | 0.5 | PROTEUS-White35-5 | — | — | — |
| 1 | — | — | W23 | — | 0.5 | PROTEUS-White35-6 | — | — | — |
| 1 | — | — | W24 | — | 0.5 | PROTEUS-White35-7 | — | — | — |
| 1 | — | — | W25 | — | 0.5 | PROTEUS-White35-8 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-A-14 | — | — | — |
| 1 | — | — | W27 | — | 0.5 | OEM-A-8 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W4 | — | 0.5 | MAIN-R-COIL- | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-A-13 | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-A-19 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | PROTEUS-Black23-14 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | PROTEUS-Black23-19 | — | — | — |
| 1 | — | — | W10 | — | 0.85 | PROTEUS-Black23-20 | — | — | — |
| 1 | — | — | W11 | — | 0.85 | PROTEUS-Black35-17 | — | — | — |
| 1 | — | — | W12 | — | 0.85 | PROTEUS-Black35-18 | — | — | — |
| 1 | — | — | W13 | — | 0.85 | PROTEUS-Black35-24 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-A-1 | Starter signal (term 50) | digital_in | PROTEUS-Black23-10 | Digital 1 | digital_in | corroborated | |
| OEM-A-10 | Coolant temperature sensor | temp_in | PROTEUS-White35-20 | Coolant temp (CLT) | temp_in | corroborated | |
| OEM-A-11 | Idle/WOT throttle switch | digital_in | PROTEUS-Black23-3 | Digital 4 | digital_in | corroborated | |
| OEM-A-12 | Injector driver (batch, all 4) | injector_out | PROTEUS-Black35-3 | Injector 1 | injector_out | corroborated | |
| OEM-A-13 | Ground | ground | MAIN-R-COIL- + PROTEUS-Black23-14 + PROTEUS-Black23-19 + PROTEUS-Black23-20 + PROTEUS-Black35-17 + PROTEUS-Black35-18 + PROTEUS-Black35-24 | Relay coil negative (ECU low-side driver) + Power ground + Power ground + Power ground + Power ground + Power ground + Power ground | ground + load | corroborated | |
| OEM-A-14 | ECU power (control-unit relay) | power_in | — | — | — | corroborated | |
| OEM-A-16 | A/C compressor signal | digital_in | PROTEUS-Black23-9 | Digital 5 | digital_in | corroborated | |
| OEM-A-17 | AFM potentiometer supply | vref | PROTEUS-White35-10 | 5V supply #2 | vref | corroborated | |
| OEM-A-18 | Hall sender signal (engine speed) | trigger_in | PROTEUS-Black23-1 | Digital 2 | trigger_in | corroborated | |
| OEM-A-19 | Ground | ground | MAIN-R-COIL- + PROTEUS-Black23-14 + PROTEUS-Black23-19 + PROTEUS-Black23-20 + PROTEUS-Black35-17 + PROTEUS-Black35-18 + PROTEUS-Black35-24 | Relay coil negative (ECU low-side driver) + Power ground + Power ground + Power ground + Power ground + Power ground + Power ground | ground + load | corroborated | |
| OEM-A-2 | Oxygen (lambda) sensor signal | lambda_nb_in | PROTEUS-White35-24 | Analog Volt 2 | analog_in | corroborated | |
| OEM-A-21 | AFM signal | analog_in | PROTEUS-White35-13 | Analog Volt 1 | analog_in | corroborated | |
| OEM-A-22 | Idle stabilizer valve coil 1 | low_side_out | PROTEUS-Black35-9 | Lowside 11 | low_side_out | corroborated | |
| OEM-A-23 | Idle stabilizer valve coil 2 | low_side_out | PROTEUS-Black35-21 | Lowside 12 | low_side_out | corroborated | |
| OEM-A-25 | Ignition timing signal to TCI | ignition_out | PROTEUS-Black35-35 | Ignition 1 | ignition_out | corroborated | |
| OEM-A-3 | Fuel pump relay control | low_side_out | PROTEUS-Black35-20 | Lowside 10 | low_side_out | corroborated | |
| OEM-A-4 | Knock sensor signal | knock_in | PROTEUS-White35-34 | Knock 1 | knock_in | corroborated | |
| OEM-A-5 | Knock sensor return | sensor_ground | PROTEUS-White35-1 + PROTEUS-White35-2 + PROTEUS-White35-23 + PROTEUS-White35-29 + PROTEUS-White35-3 + PROTEUS-White35-4 + PROTEUS-White35-5 + PROTEUS-White35-6 + PROTEUS-White35-7 + PROTEUS-White35-8 | Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground | sensor_ground | corroborated | |
| OEM-A-6 | Sensor ground (CTS/Hall/AFM/throttle) | sensor_ground | PROTEUS-White35-1 + PROTEUS-White35-2 + PROTEUS-White35-23 + PROTEUS-White35-29 + PROTEUS-White35-3 + PROTEUS-White35-4 + PROTEUS-White35-5 + PROTEUS-White35-6 + PROTEUS-White35-7 + PROTEUS-White35-8 | Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground + Sensor ground | sensor_ground | corroborated | |
| OEM-A-7 | Knock sensor shield | shield | — | — | — | corroborated | |
| OEM-A-8 | Hall sender supply (distributor) | vref | — | — | — | conflict | |
| OEM-A-9 | Intake air temperature sensor | temp_in | PROTEUS-White35-30 | Intake air temp (IAT) | temp_in | corroborated |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-A-14 | SP-14V-1 | 0.85 | no route | ECU power (control-unit relay) | — | |
| W2 | NEW-KEYON-1 | MAIN-R-COIL+ | 0.5 | no route | Relay coil positive (ignition-switched +12V) | — | |
| W3 | NEW-BATT-1 | MAIN-R-IN | 0.85 | no route | Relay contact input (battery + via main fuse) | — | |
| W4 | MAIN-R-COIL- | SP-GND-1 | 0.5 | no route | Relay coil negative (ECU low-side driver) | — | |
| W5 | MAIN-R-OUT | PROTEUS-Black23-23 | 0.85 | no route | Relay contact output (switched +12V bus) | — | |
| W6 | OEM-A-13 | SP-GND-1 | 0.85 | no route | Ground | — | |
| W7 | OEM-A-19 | SP-GND-1 | 0.85 | no route | Ground | — | |
| W8 | SP-GND-1 | PROTEUS-Black23-14 | 0.85 | no route | Power ground | — | |
| W9 | SP-GND-1 | PROTEUS-Black23-19 | 0.85 | no route | Power ground | — | |
| W10 | SP-GND-1 | PROTEUS-Black23-20 | 0.85 | no route | Power ground | — | |
| W11 | SP-GND-1 | PROTEUS-Black35-17 | 0.85 | no route | Power ground | — | |
| W12 | SP-GND-1 | PROTEUS-Black35-18 | 0.85 | no route | Power ground | — | |
| W13 | SP-GND-1 | PROTEUS-Black35-24 | 0.85 | no route | Power ground | — | |
| W14 | OEM-A-5 | SP-0V-1 | 0.5 | no route | Knock sensor return | — | |
| W15 | OEM-A-6 | SP-0V-1 | 0.5 | no route | Sensor ground (CTS/Hall/AFM/throttle) | — | |
| W16 | SP-0V-1 | PROTEUS-White35-1 | 0.5 | no route | Sensor ground | — | |
| W17 | SP-0V-1 | PROTEUS-White35-2 | 0.5 | no route | Sensor ground | — | |
| W18 | SP-0V-1 | PROTEUS-White35-23 | 0.5 | no route | Sensor ground | — | |
| W19 | SP-0V-1 | PROTEUS-White35-29 | 0.5 | no route | Sensor ground | — | |
| W20 | SP-0V-1 | PROTEUS-White35-3 | 0.5 | no route | Sensor ground | — | |
| W21 | SP-0V-1 | PROTEUS-White35-4 | 0.5 | no route | Sensor ground | — | |
| W22 | SP-0V-1 | PROTEUS-White35-5 | 0.5 | no route | Sensor ground | — | |
| W23 | SP-0V-1 | PROTEUS-White35-6 | 0.5 | no route | Sensor ground | — | |
| W24 | SP-0V-1 | PROTEUS-White35-7 | 0.5 | no route | Sensor ground | — | |
| W25 | SP-0V-1 | PROTEUS-White35-8 | 0.5 | no route | Sensor ground | — | |
| W26 | OEM-A-17 | PROTEUS-White35-10 | 0.5 | no route | AFM potentiometer supply | — | |
| W27 | OEM-A-8 | SP-14V-1 | 0.5 | no route | Hall sender supply (distributor) | — | |
| W28 | OEM-A-18 | PROTEUS-Black23-1 | 0.5 | no route | Hall sender signal (engine speed) | — | |
| W29 | OEM-A-4 | PROTEUS-White35-34 | 0.5 | no route | Knock sensor signal | — | |
| W30 | OEM-A-25 | PROTEUS-Black35-35 | 0.5 | no route | Ignition timing signal to TCI | — | |
| W31 | OEM-A-12 | PROTEUS-Black35-3 | 0.5 | no route | Injector driver (batch, all 4) | — | |
| W32 | OEM-A-3 | PROTEUS-Black35-20 | 0.5 | no route | Fuel pump relay control | — | |
| W33 | OEM-A-21 | PROTEUS-White35-13 | 0.5 | no route | AFM signal | — | |
| W34 | OEM-A-10 | PROTEUS-White35-20 | 0.5 | no route | Coolant temperature sensor | — | |
| W35 | OEM-A-22 | PROTEUS-Black35-9 | 0.5 | no route | Idle stabilizer valve coil 1 | — | |
| W36 | OEM-A-23 | PROTEUS-Black35-21 | 0.5 | no route | Idle stabilizer valve coil 2 | — | |
| W37 | OEM-A-2 | PROTEUS-White35-24 | 0.5 | no route | Oxygen (lambda) sensor signal | — | |
| W38 | OEM-A-9 | PROTEUS-White35-30 | 0.5 | no route | Intake air temperature sensor | — | |
| W39 | OEM-A-1 | PROTEUS-Black23-10 | 0.5 | no route | Starter signal (term 50) | — | |
| W40 | OEM-A-11 | PROTEUS-Black23-3 | 0.5 | no route | Idle/WOT throttle switch | — | |
| W41 | OEM-A-16 | PROTEUS-Black23-9 | 0.5 | no route | A/C compressor signal | — | |
| W42 | NEW-KEYON-1 | PROTEUS-Black23-18 | 0.5 | no route | Ignition switch in | — |
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 |
|---|---|---|---|
| error | REQUIRED_UNMAPPED | OEM-A-8 | Required OEM function "Hall sender supply (distributor)" (vref) is not connected to the new ECU. |
| warn | PIN_CONFLICT | OEM-A-8 | Sources disagree about OEM-A-8: oem_manual: Hall sender supply (distributor) (Bentley Publishers — Volkswagen Golf/Jetta/Scirocco Service Manual 1980–1993 (Digifant wiring)) | community_copy: Hall sender supply (distributor) (a2resource: Digifant II engine controller pinout (VW Golf/Jetta Mk2 1.8 8v)) | community_copy: Hall sender supply (distributor) (drive2.ru: VW Golf Mk2 PF Digifant II ECU pinout) |
| info | NET_FAMILY | PROTEUS-Black23-18 ↔ MAIN-R-COIL+ | PROTEUS-Black23-18 "Ignition switch in" [digital_in] is wired to MAIN-R-COIL+ "Relay coil positive (ignition-switched +12V)" [power_in]. Switched supply used as the ignition-on sense. |
| info | UNMAPPED | OEM | 1 optional OEM pins are not mapped: OEM-A-7 Knock sensor shield |
Accepted (0)
| Code | Subject | Reason | By |
|---|
Notes
Fit check: unconfirmed. Confirm these before building: - Trigger pattern for VW Digifant not found in the ECU's docs (No Digifant (distributor, no crank wheel) decoder; needs trigger-wheel conversion.) - Main power feed not sourced — Proteus's relay-fed power input is drawn through the main relay, but the feed's fuse rating is not in the library yet Auto-mapped by auto_map() from the library pin data on 2026-10-19. Review every wire against both manuals before building. Not wired: - OEM-A 7: Knock sensor shield: no shield pin on rusEFI Proteus
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | oem_manual | Bentley Publishers — Volkswagen Golf/Jetta/Scirocco Service Manual 1980–1993 (Digifant wiring) | — | — | — | — |
| 4 | vendor_doc | Emtron SL4/SL6/SL8 pinout pages | https://docs.emtronaustralia.com.au/engine-management/wiring/index.html | archive | 2026-10-05 | e52b3da9996a |
| 4 | vendor_doc | rusEFI Proteus — board connector definitions (Black35 / White35 / Black23) | https://github.com/rusefi/rusefi/tree/master/firmware/config/boards/proteus/connectors | archive | 2026-10-05 | 738a2ea934c0 |
| 3 | forum | rusEFI Mazda Miata 2002 engine wiring | https://github.com/rusefi/rusefi/wiki/Mazda-Miata-2002 | archive | 2026-10-05 | cc3cae670408 |
| 2 | community_copy | a2resource: Digifant II engine controller pinout (VW Golf/Jetta Mk2 1.8 8v) | http://www.a2resource.com/electrical/management/digifant2.html | — | — | — |
| 2 | community_copy | drive2.ru: VW Golf Mk2 PF Digifant II ECU pinout | https://www.drive2.ru/l/9886121 | — | — | — |