VW Golf/Jetta Mk2 1.8 8v Digifant II → Emtron KV12 (auto)
VW Golf/Jetta Mk2 1.8 8v Digifant II — Emtron — KV12
⚠ 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 | 1: read the Findings page before cutting any wire |
| Size of the job | 33 wires · 9 connectors · 5 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-14 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | SP-14V-1 | KV12-D-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-14V-1 | KV12-D-2 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | SP-14V-1 | KV12-D-20 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-A-13 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-A-19 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | SP-GND-1 | KV12-A-19 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | KV12-B-34 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | KV12-B-9 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-GND-1 | KV12-C-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-GND-1 | KV12-C-26 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-A-5 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-A-6 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | SP-0V-1 | KV12-C-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | SP-0V-1 | KV12-C-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-A-17 | KV12-D-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-A-18 | KV12-D-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | SP-0V-1 | KV12-D-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-A-4 | KV12-D-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-A-25 | KV12-B-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-A-12 | KV12-B-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-A-7 | SP-SHD-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | SP-SHD-1 | KV12-D-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-A-3 | KV12-D-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-A-21 | KV12-C-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-A-10 | KV12-C-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-A-22 | KV12-B-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-A-23 | KV12-B-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-A-2 | KV12-C-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-A-9 | KV12-C-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-A-1 | KV12-C-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-A-11 | KV12-C-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-A-16 | KV12-C-29 | 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 | KV12-D-1 | KV12-C-17 | open (OL) | +12 V supply must not touch sensor ground | |
| 2 | KV12-D-21 | KV12-C-17 | open (OL) | 5 V sensor reference must not touch sensor ground | |
| 3 | KV12-A-19 | KV12-D-1 | open (OL) | power ground must not touch +12 V supply | |
| 4 | KV12-A-19 | KV12-D-21 | open (OL) | power ground must not touch 5 V sensor reference | |
| 5 | KV12-D-1 | KV12-D-21 | open (OL) | +12 V supply must not touch 5 V sensor reference |
If any reading doesn't match, stop and get help before powering up.
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
KV12-A
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injection Channel 9 | — | — | — | — | — | — | — | — |
| 2 | Injection Channel 10 | — | — | — | — | — | — | — | — |
| 3 | Injection Channel 11 | — | — | — | — | — | — | — | — |
| 4 | Injection Channel 12 | — | — | — | — | — | — | — | — |
| 5 | — | — | — | — | — | — | — | — | — |
| 6 | — | — | — | — | — | — | — | — | — |
| 7 | — | — | — | — | — | — | — | — | — |
| 8 | Ignition Channel 9 | — | — | — | — | — | — | — | — |
| 9 | Ignition Channel 10 | — | — | — | — | — | — | — | — |
| 10 | Lambda 1 Heater - | — | — | — | — | — | — | — | — |
| 11 | Lambda 2 Heater - | — | — | — | — | — | — | — | — |
| 12 | — | — | — | — | — | — | — | — | — |
| 13 | — | — | — | — | — | — | — | — | — |
| 14 | Ignition Channel 11 | — | — | — | — | — | — | — | — |
| 15 | Ignition Channel 12 | — | — | — | — | — | — | — | — |
| 16 | Lambda 1 Heater + | — | — | — | — | — | — | — | — |
| 17 | Lambda 2 Heater + | — | — | — | — | — | — | — | — |
| 18 | Lambda 1 Nernst Cell (Vs) | — | — | — | — | — | — | — | — |
| 19 | ECU Ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 20 | Lambda 2 Cal Resistor (CalR) | — | — | — | — | — | — | — | — |
| 21 | Lambda 2 Nernst Cell (Vs) | — | — | — | — | — | — | — | — |
| 22 | Lambda 2 Pump Cell (Ip) | — | — | — | — | — | — | — | — |
| 23 | Lambda 2 Virtual Ground (VGnd) | — | — | — | — | — | — | — | — |
| 24 | Lambda 1 Cal Resistor (CalR) | — | — | — | — | — | — | — | — |
| 25 | Lambda 1 Pump Cell (Ip) | — | — | — | — | — | — | — | — |
| 26 | Lambda 1 Virtual Ground (VGnd) | — | — | — | — | — | — | — | — |
KV12-B
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injection Channel 1 | — | W21 | — | 0.5 | OEM-A-12 | — | — | — |
| 2 | Injection Channel 2 | — | — | — | — | — | — | — | — |
| 3 | Injection Channel 3 | — | — | — | — | — | — | — | — |
| 4 | Injection Channel 4 | — | — | — | — | — | — | — | — |
| 5 | Injection Channel 5 | — | — | — | — | — | — | — | — |
| 6 | Injection Channel 6 | — | — | — | — | — | — | — | — |
| 7 | Injection Channel 7 | — | — | — | — | — | — | — | — |
| 8 | Injection Channel 8 | — | — | — | — | — | — | — | — |
| 9 | ECU Ground | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| 10 | Auxiliary Output 1 | — | — | — | — | — | — | — | — |
| 11 | Auxiliary Output 2 | — | — | — | — | — | — | — | — |
| 12 | Auxiliary Output 3 | — | — | — | — | — | — | — | — |
| 13 | Auxiliary Output 4 | — | — | — | — | — | — | — | — |
| 14 | Auxiliary Output 5 | — | W27 | — | 0.5 | OEM-A-22 | — | — | — |
| 15 | Auxiliary Output 6 | — | W28 | — | 0.5 | OEM-A-23 | — | — | — |
| 16 | Auxiliary Output 7 | — | — | — | — | — | — | — | — |
| 17 | Auxiliary Output 8 | — | — | — | — | — | — | — | — |
| 18 | Auxiliary Output 9 | — | — | — | — | — | — | — | — |
| 19 | Auxiliary Output 10 | — | — | — | — | — | — | — | — |
| 20 | Auxiliary Output 11 | — | — | — | — | — | — | — | — |
| 21 | Auxiliary Output 12 | — | — | — | — | — | — | — | — |
| 22 | Auxiliary Output 13 | — | — | — | — | — | — | — | — |
| 23 | Auxiliary Output 14 | — | — | — | — | — | — | — | — |
| 24 | Auxiliary Output 15 | — | — | — | — | — | — | — | — |
| 25 | Auxiliary Output 16 | — | — | — | — | — | — | — | — |
| 26 | Ignition Channel 1 | — | W20 | — | 0.5 | OEM-A-25 | — | — | — |
| 27 | Ignition Channel 2 | — | — | — | — | — | — | — | — |
| 28 | Ignition Channel 3 | — | — | — | — | — | — | — | — |
| 29 | Ignition Channel 4 | — | — | — | — | — | — | — | — |
| 30 | Ignition Channel 5 | — | — | — | — | — | — | — | — |
| 31 | Ignition Channel 6 | — | — | — | — | — | — | — | — |
| 32 | Ignition Channel 7 | — | — | — | — | — | — | — | — |
| 33 | Ignition Channel 8 | — | — | — | — | — | — | — | — |
| 34 | ECU Ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
KV12-C
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | ECU Ground | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
| 2 | Analog Input Channel 1 | — | W25 | — | 0.5 | OEM-A-21 | — | — | — |
| 3 | Analog Input Channel 2 | — | W26 | — | 0.5 | OEM-A-10 | — | — | — |
| 4 | Analog Input Channel 3 | — | W29 | — | 0.5 | OEM-A-2 | — | — | — |
| 5 | Analog Input Channel 4 | — | W30 | — | 0.5 | OEM-A-9 | — | — | — |
| 6 | Analog Input Channel 5 | — | — | — | — | — | — | — | — |
| 7 | Analog Input Channel 6 | — | — | — | — | — | — | — | — |
| 8 | Analog Input Channel 7 | — | — | — | — | — | — | — | — |
| 9 | Analog Input Channel 8 | — | — | — | — | — | — | — | — |
| 10 | Analog Input Channel 9 | — | — | — | — | — | — | — | — |
| 11 | Analog Input Channel 10 | — | — | — | — | — | — | — | — |
| 12 | Analog Input Channel 11 | — | — | — | — | — | — | — | — |
| 13 | Analog Input Channel 12 | — | — | — | — | — | — | — | — |
| 14 | Analog Input Channel 13 | — | — | — | — | — | — | — | — |
| 15 | Analog Input Channel 14 | — | — | — | — | — | — | — | — |
| 16 | Analog Input Channel 15 | — | — | — | — | — | — | — | — |
| 17 | Analog Sensor 0V Reference | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 18 | Digital Input 9 | — | — | — | — | — | — | — | — |
| 19 | Digital Input 10 | — | — | — | — | — | — | — | — |
| 20 | Digital Input 11 | — | — | — | — | — | — | — | — |
| 21 | Digital Input 12 | — | — | — | — | — | — | — | — |
| 22 | Digital Input 13 | — | — | — | — | — | — | — | — |
| 23 | Digital Input 14 | — | — | — | — | — | — | — | — |
| 24 | Analog Input Channel 16 | — | — | — | — | — | — | — | — |
| 25 | Analog Sensor 0V Reference | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 26 | ECU Ground | — | W11 | — | 0.85 | SP-GND-1 | — | — | — |
| 27 | Digital Input 1 | — | W31 | — | 0.5 | OEM-A-1 | — | — | — |
| 28 | Digital Input 2 | — | W32 | — | 0.5 | OEM-A-11 | — | — | — |
| 29 | Digital Input 3 | — | W33 | — | 0.5 | OEM-A-16 | — | — | — |
| 30 | Digital Input 4 | — | — | — | — | — | — | — | — |
| 31 | Digital Input 5 | — | — | — | — | — | — | — | — |
| 32 | Digital Input 6 | — | — | — | — | — | — | — | — |
| 33 | Digital Input 7 | — | — | — | — | — | — | — | — |
| 34 | Digital Input 8 | — | — | — | — | — | — | — | — |
KV12-D
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | ECU 14V Supply | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 2 | Auxiliary Output 13-16 14V Supply | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 3 | Sensor Supply 8V | — | — | — | — | — | — | — | — |
| 4 | Crank Index Sensor + | — | — | — | — | — | — | — | — |
| 5 | Crank Index Sensor - | — | — | — | — | — | — | — | — |
| 6 | Sync Sensor + | — | W17 | — | 0.5 | OEM-A-18 | — | — | — |
| 7 | Sync Sensor - | — | W18 | — | 0.5 | SP-0V-1 | — | — | — |
| 8 | CAN 1H | — | — | — | — | — | — | — | — |
| 9 | EFI Relay Output (Low Side 200mA) | — | W24 | — | 0.5 | OEM-A-3 | — | — | — |
| 10 | CAN 2H | — | — | — | — | — | — | — | — |
| 11 | Knock 1 + | — | W19 | — | 0.5 | OEM-A-4 | — | — | — |
| 12 | Knock 1 - | — | — | — | — | — | — | — | — |
| 13 | Shield (Crank/Cam/ Knock) | — | W23 | — | 0.5 | SP-SHD-1 | — | — | — |
| 14 | CAN 1L | — | — | — | — | — | — | — | — |
| 15 | Ignition Switch Input | — | — | — | — | — | — | — | — |
| 16 | CAN 2L | — | — | — | — | — | — | — | — |
| 17 | Knock 2 + | — | — | — | — | — | — | — | — |
| 18 | Knock 2 - | — | — | — | — | — | — | — | — |
| 19 | Analog Output (0.0 - 5.0V) | — | — | — | — | — | — | — | — |
| 20 | Auxiliary Output 9-12 14V Supply | — | W4 | — | 0.85 | SP-14V-1 | — | — | — |
| 21 | Sensor Supply Vref1: 5.0V | — | W16 | — | 0.5 | OEM-A-17 | — | — | — |
| 22 | Sensor Supply Vref2: 5.0V | — | — | — | — | — | — | — | — |
| 23 | Ethernet Tx + | — | — | — | — | — | — | — | — |
| 24 | Ethernet Tx - | — | — | — | — | — | — | — | — |
| 25 | Ethernet Rx + | — | — | — | — | — | — | — | — |
| 26 | Ethernet Rx - | — | — | — | — | — | — | — | — |
OEM-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Starter signal (term 50) | — | W31 | — | 0.5 | KV12-C-27 | — | — | — |
| 10 | Coolant temperature sensor | — | W26 | — | 0.5 | KV12-C-3 | — | — | — |
| 11 | Idle/WOT throttle switch | — | W32 | — | 0.5 | KV12-C-28 | — | — | — |
| 12 | Injector driver (batch, all 4) | — | W21 | — | 0.5 | KV12-B-1 | — | — | — |
| 13 | Ground | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 14 | ECU power (control-unit relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 16 | A/C compressor signal | — | W33 | — | 0.5 | KV12-C-29 | — | — | — |
| 17 | AFM potentiometer supply | — | W16 | — | 0.5 | KV12-D-21 | — | — | — |
| 18 | Hall sender signal (engine speed) | — | W17 | — | 0.5 | KV12-D-6 | — | — | — |
| 19 | Ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 2 | Oxygen (lambda) sensor signal | — | W29 | — | 0.5 | KV12-C-4 | — | — | — |
| 21 | AFM signal | — | W25 | — | 0.5 | KV12-C-2 | — | — | — |
| 22 | Idle stabilizer valve coil 1 | — | W27 | — | 0.5 | KV12-B-14 | — | — | — |
| 23 | Idle stabilizer valve coil 2 | — | W28 | — | 0.5 | KV12-B-15 | — | — | — |
| 25 | Ignition timing signal to TCI | — | W20 | — | 0.5 | KV12-B-26 | — | — | — |
| 3 | Fuel pump relay control | — | W24 | — | 0.5 | KV12-D-9 | — | — | — |
| 4 | Knock sensor signal | — | W19 | — | 0.5 | KV12-D-11 | — | — | — |
| 5 | Knock sensor return | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 6 | Sensor ground (CTS/Hall/AFM/throttle) | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 7 | Knock sensor shield | — | W22 | — | 0.5 | SP-SHD-1 | — | — | — |
| 8 | Hall sender supply (distributor) | — | — | — | — | — | — | — | — |
| 9 | Intake air temperature sensor | — | W30 | — | 0.5 | KV12-C-5 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W12 | — | 0.5 | OEM-A-5 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | OEM-A-6 | — | — | — |
| 1 | — | — | W14 | — | 0.5 | KV12-C-17 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | KV12-C-25 | — | — | — |
| 1 | — | — | W18 | — | 0.5 | KV12-D-7 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-A-14 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | KV12-D-1 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | KV12-D-2 | — | — | — |
| 1 | — | — | W4 | — | 0.85 | KV12-D-20 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W5 | — | 0.85 | OEM-A-13 | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-A-19 | — | — | — |
| 1 | — | — | W7 | — | 0.85 | KV12-A-19 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | KV12-B-34 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | KV12-B-9 | — | — | — |
| 1 | — | — | W10 | — | 0.85 | KV12-C-1 | — | — | — |
| 1 | — | — | W11 | — | 0.85 | KV12-C-26 | — | — | — |
SP-SHD
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W22 | — | 0.5 | OEM-A-7 | — | — | — |
| 1 | — | — | W23 | — | 0.5 | KV12-D-13 | — | — | — |
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 | KV12-C-27 | Digital Input 1 | digital_in | corroborated | |
| OEM-A-10 | Coolant temperature sensor | temp_in | KV12-C-3 | Analog Input Channel 2 | analog_in | corroborated | |
| OEM-A-11 | Idle/WOT throttle switch | digital_in | KV12-C-28 | Digital Input 2 | digital_in | corroborated | |
| OEM-A-12 | Injector driver (batch, all 4) | injector_out | KV12-B-1 | Injection Channel 1 | injector_out | corroborated | |
| OEM-A-13 | Ground | ground | KV12-A-19 + KV12-B-34 + KV12-B-9 + KV12-C-1 + KV12-C-26 | ECU Ground + ECU Ground + ECU Ground + ECU Ground + ECU Ground | ground | corroborated | |
| OEM-A-14 | ECU power (control-unit relay) | power_in | KV12-D-1 + KV12-D-2 + KV12-D-20 | ECU 14V Supply + Auxiliary Output 13-16 14V Supply + Auxiliary Output 9-12 14V Supply | power_in | corroborated | |
| OEM-A-16 | A/C compressor signal | digital_in | KV12-C-29 | Digital Input 3 | digital_in | corroborated | |
| OEM-A-17 | AFM potentiometer supply | vref | KV12-D-21 | Sensor Supply Vref1: 5.0V | vref | corroborated | |
| OEM-A-18 | Hall sender signal (engine speed) | trigger_in | KV12-D-6 | Sync Sensor + | trigger_in | corroborated | |
| OEM-A-19 | Ground | ground | KV12-A-19 + KV12-B-34 + KV12-B-9 + KV12-C-1 + KV12-C-26 | ECU Ground + ECU Ground + ECU Ground + ECU Ground + ECU Ground | ground | corroborated | |
| OEM-A-2 | Oxygen (lambda) sensor signal | lambda_nb_in | KV12-C-4 | Analog Input Channel 3 | analog_in | corroborated | |
| OEM-A-21 | AFM signal | analog_in | KV12-C-2 | Analog Input Channel 1 | analog_in | corroborated | |
| OEM-A-22 | Idle stabilizer valve coil 1 | low_side_out | KV12-B-14 | Auxiliary Output 5 | low_side_out | corroborated | |
| OEM-A-23 | Idle stabilizer valve coil 2 | low_side_out | KV12-B-15 | Auxiliary Output 6 | low_side_out | corroborated | |
| OEM-A-25 | Ignition timing signal to TCI | ignition_out | KV12-B-26 | Ignition Channel 1 | ignition_out | corroborated | |
| OEM-A-3 | Fuel pump relay control | low_side_out | KV12-D-9 | EFI Relay Output (Low Side 200mA) | low_side_out | corroborated | |
| OEM-A-4 | Knock sensor signal | knock_in | KV12-D-11 | Knock 1 + | knock_in | corroborated | |
| OEM-A-5 | Knock sensor return | sensor_ground | KV12-C-17 + KV12-C-25 + KV12-D-7 | Analog Sensor 0V Reference + Analog Sensor 0V Reference + Sync Sensor - | sensor_ground + trigger_in | corroborated | |
| OEM-A-6 | Sensor ground (CTS/Hall/AFM/throttle) | sensor_ground | KV12-C-17 + KV12-C-25 + KV12-D-7 | Analog Sensor 0V Reference + Analog Sensor 0V Reference + Sync Sensor - | sensor_ground + trigger_in | corroborated | |
| OEM-A-7 | Knock sensor shield | shield | KV12-D-13 | Shield (Crank/Cam/ Knock) | shield | corroborated | |
| OEM-A-8 | Hall sender supply (distributor) | power_in | — | — | — | corroborated | |
| OEM-A-9 | Intake air temperature sensor | temp_in | KV12-C-5 | Analog Input Channel 4 | analog_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 | SP-14V-1 | KV12-D-1 | 0.85 | no route | ECU 14V Supply | — | |
| W3 | SP-14V-1 | KV12-D-2 | 0.85 | no route | Auxiliary Output 13-16 14V Supply | — | |
| W4 | SP-14V-1 | KV12-D-20 | 0.85 | no route | Auxiliary Output 9-12 14V Supply | — | |
| W5 | OEM-A-13 | SP-GND-1 | 0.85 | no route | Ground | — | |
| W6 | OEM-A-19 | SP-GND-1 | 0.85 | no route | Ground | — | |
| W7 | SP-GND-1 | KV12-A-19 | 0.85 | no route | ECU Ground | — | |
| W8 | SP-GND-1 | KV12-B-34 | 0.85 | no route | ECU Ground | — | |
| W9 | SP-GND-1 | KV12-B-9 | 0.85 | no route | ECU Ground | — | |
| W10 | SP-GND-1 | KV12-C-1 | 0.85 | no route | ECU Ground | — | |
| W11 | SP-GND-1 | KV12-C-26 | 0.85 | no route | ECU Ground | — | |
| W12 | OEM-A-5 | SP-0V-1 | 0.5 | no route | Knock sensor return | — | |
| W13 | OEM-A-6 | SP-0V-1 | 0.5 | no route | Sensor ground (CTS/Hall/AFM/throttle) | — | |
| W14 | SP-0V-1 | KV12-C-17 | 0.5 | no route | Analog Sensor 0V Reference | — | |
| W15 | SP-0V-1 | KV12-C-25 | 0.5 | no route | Analog Sensor 0V Reference | — | |
| W16 | OEM-A-17 | KV12-D-21 | 0.5 | no route | AFM potentiometer supply | — | |
| W17 | OEM-A-18 | KV12-D-6 | 0.5 | no route | Hall sender signal (engine speed) | — | |
| W18 | SP-0V-1 | KV12-D-7 | 0.5 | no route | Sync Sensor - | — | |
| W19 | OEM-A-4 | KV12-D-11 | 0.5 | no route | Knock sensor signal | — | |
| W20 | OEM-A-25 | KV12-B-26 | 0.5 | no route | Ignition timing signal to TCI | — | |
| W21 | OEM-A-12 | KV12-B-1 | 0.5 | no route | Injector driver (batch, all 4) | — | |
| W22 | OEM-A-7 | SP-SHD-1 | 0.5 | no route | Knock sensor shield | — | |
| W23 | SP-SHD-1 | KV12-D-13 | 0.5 | no route | Shield (Crank/Cam/ Knock) | — | |
| W24 | OEM-A-3 | KV12-D-9 | 0.5 | no route | Fuel pump relay control | — | |
| W25 | OEM-A-21 | KV12-C-2 | 0.5 | no route | AFM signal | — | |
| W26 | OEM-A-10 | KV12-C-3 | 0.5 | no route | Coolant temperature sensor | — | |
| W27 | OEM-A-22 | KV12-B-14 | 0.5 | no route | Idle stabilizer valve coil 1 | — | |
| W28 | OEM-A-23 | KV12-B-15 | 0.5 | no route | Idle stabilizer valve coil 2 | — | |
| W29 | OEM-A-2 | KV12-C-4 | 0.5 | no route | Oxygen (lambda) sensor signal | — | |
| W30 | OEM-A-9 | KV12-C-5 | 0.5 | no route | Intake air temperature sensor | — | |
| W31 | OEM-A-1 | KV12-C-27 | 0.5 | no route | Starter signal (term 50) | — | |
| W32 | OEM-A-11 | KV12-C-28 | 0.5 | no route | Idle/WOT throttle switch | — | |
| W33 | OEM-A-16 | KV12-C-29 | 0.5 | no route | A/C compressor signal | — |
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 | 3-1437290-8 | TE | Superseal 1.0 26-way plug, Key 2 | 1.000 | ea |
| connector | 4-1437290-0 | TE | Superseal 1.0 34-way plug, Key 1 | 1.000 | ea |
| connector | 4-1437290-1 | TE | Superseal 1.0 34-way plug, Key 2 | 1.000 | ea |
| terminal | 3-1447221-4 | TE | Superseal 1.0 socket terminal, 20 AWG (0.5 sq mm) | 27.000 | ea |
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| No configured channels. | |||||||
Findings
Open (5)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | REQUIRED_UNMAPPED | OEM-A-8 | Required OEM function "Hall sender supply (distributor)" (power_in) is not connected to the new ECU. |
| warn | DATASET_GAP | KV12 A | 5 of 26 cavities on KV12 A have no pin data (5,6,7,12,13). Anything there is invisible to these checks. |
| info | NET_FAMILY | OEM-A-10 ↔ KV12-C-3 | OEM-A-10 "Coolant temperature sensor" [temp_in] is wired to KV12-C-3 "Analog Input Channel 2" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | NET_FAMILY | OEM-A-6 ↔ KV12-D-7 | OEM-A-6 "Sensor ground (CTS/Hall/AFM/throttle)" [sensor_ground] is wired to KV12-D-7 "Sync Sensor -" [trigger_in]. Trigger return tied to sensor/trigger ground: correct for single-ended trigger inputs. |
| info | NET_FAMILY | OEM-A-9 ↔ KV12-C-5 | OEM-A-9 "Intake air temperature sensor" [temp_in] is wired to KV12-C-5 "Analog Input Channel 4" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
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 VW/Audi decoder anywhere in the mode list.) 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 8: Hall sender supply (distributor): no rule for class sensor_supply_in; wire by hand Not wired: - KV12-D 12: Knock 1 - left open: the stock knock sensor has one ECU wire; check the ECU manual for single-wire knock sensors - KV12-D 15: Ignition Switch Input: not fed (the stock ECU has no ignition-sense pin); feed it from a switched-ignition source
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | Emtron KV12/KV16 Pinout Rev2 | https://github.com/emtron-australia/help | — | 2026-10-05 | 2f3a1b2d2ed4 |
| 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 | — | — | — |