BMW 3 Series E36 1990–2000 (M50/M52) → Emtron KV12 (auto)
BMW 3 Series E36 1990–2000 (M50/M52) — Emtron — KV12
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 2026-10-08
Before you start
| Status | draft · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | none |
| Size of the job | 57 wires · 9 connectors · 6 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-X-54 | 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-X-15 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-X-34 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-X-55 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | OEM-X-6 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | KV12-A-19 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-GND-1 | KV12-B-34 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-GND-1 | KV12-B-9 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | SP-GND-1 | KV12-C-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | SP-GND-1 | KV12-C-26 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-X-28 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-X-40 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-X-43 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-X-44 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-X-71 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | SP-0V-1 | KV12-C-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | SP-0V-1 | KV12-C-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-X-59 | KV12-D-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-X-16 | KV12-D-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | SP-0V-1 | KV12-D-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-X-17 | KV12-D-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | SP-0V-1 | KV12-D-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-X-70 | KV12-D-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-X-69 | KV12-D-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-X-50 | KV12-B-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-X-51 | KV12-B-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-X-52 | KV12-B-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-X-23 | KV12-B-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-X-25 | KV12-B-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-X-24 | KV12-B-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-X-33 | KV12-B-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-X-32 | KV12-B-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-X-31 | KV12-B-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-X-5 | KV12-B-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-X-3 | KV12-B-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-X-4 | KV12-B-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-X-45 | SP-SHD-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | SP-SHD-1 | KV12-D-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-X-56 | KV12-D-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-X-1 | KV12-D-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-X-27 | KV12-B-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-X-38 | KV12-A-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-X-2 | KV12-B-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-X-29 | KV12-B-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | OEM-X-36 | KV12-B-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W49 | OEM-X-7 | KV12-B-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W50 | OEM-X-8 | KV12-B-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W51 | OEM-X-47 | KV12-B-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W52 | OEM-X-41 | KV12-C-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W53 | OEM-X-73 | KV12-C-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W54 | OEM-X-13 | KV12-C-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W55 | OEM-X-78 | KV12-C-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W56 | OEM-X-77 | KV12-C-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W57 | OEM-X-42 | KV12-C-27 | 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-A-19 | KV12-D-1 | open (OL) | power ground must not touch +12 V supply | |
| 2 | KV12-A-19 | KV12-D-21 | open (OL) | power ground must not touch 5 V sensor reference | |
| 3 | KV12-C-17 | KV12-D-1 | open (OL) | sensor ground must not touch +12 V supply | |
| 4 | KV12-C-17 | KV12-D-21 | open (OL) | sensor 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 |
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 - | — | W45 | — | 0.5 | OEM-X-38 | — | — | — |
| 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 | — | W9 | — | 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 | — | W34 | — | 0.5 | OEM-X-33 | — | — | — |
| 2 | Injection Channel 2 | — | W35 | — | 0.5 | OEM-X-32 | — | — | — |
| 3 | Injection Channel 3 | — | W36 | — | 0.5 | OEM-X-31 | — | — | — |
| 4 | Injection Channel 4 | — | W37 | — | 0.5 | OEM-X-5 | — | — | — |
| 5 | Injection Channel 5 | — | W38 | — | 0.5 | OEM-X-3 | — | — | — |
| 6 | Injection Channel 6 | — | W39 | — | 0.5 | OEM-X-4 | — | — | — |
| 7 | Injection Channel 7 | — | — | — | — | — | — | — | — |
| 8 | Injection Channel 8 | — | — | — | — | — | — | — | — |
| 9 | ECU Ground | — | W11 | — | 0.85 | SP-GND-1 | — | — | — |
| 10 | Auxiliary Output 1 | — | W49 | — | 0.5 | OEM-X-7 | — | — | — |
| 11 | Auxiliary Output 2 | — | W50 | — | 0.5 | OEM-X-8 | — | — | — |
| 12 | Auxiliary Output 3 | — | W51 | — | 0.5 | OEM-X-47 | — | — | — |
| 13 | Auxiliary Output 4 | — | — | — | — | — | — | — | — |
| 14 | Auxiliary Output 5 | — | W44 | — | 0.5 | OEM-X-27 | — | — | — |
| 15 | Auxiliary Output 6 | — | W46 | — | 0.5 | OEM-X-2 | — | — | — |
| 16 | Auxiliary Output 7 | — | W47 | — | 0.5 | OEM-X-29 | — | — | — |
| 17 | Auxiliary Output 8 | — | W48 | — | 0.5 | OEM-X-36 | — | — | — |
| 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 | — | W28 | — | 0.5 | OEM-X-50 | — | — | — |
| 27 | Ignition Channel 2 | — | W29 | — | 0.5 | OEM-X-51 | — | — | — |
| 28 | Ignition Channel 3 | — | W30 | — | 0.5 | OEM-X-52 | — | — | — |
| 29 | Ignition Channel 4 | — | W31 | — | 0.5 | OEM-X-23 | — | — | — |
| 30 | Ignition Channel 5 | — | W32 | — | 0.5 | OEM-X-25 | — | — | — |
| 31 | Ignition Channel 6 | — | W33 | — | 0.5 | OEM-X-24 | — | — | — |
| 32 | Ignition Channel 7 | — | — | — | — | — | — | — | — |
| 33 | Ignition Channel 8 | — | — | — | — | — | — | — | — |
| 34 | ECU Ground | — | W10 | — | 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 | — | W12 | — | 0.85 | SP-GND-1 | — | — | — |
| 2 | Analog Input Channel 1 | — | W52 | — | 0.5 | OEM-X-41 | — | — | — |
| 3 | Analog Input Channel 2 | — | W53 | — | 0.5 | OEM-X-73 | — | — | — |
| 4 | Analog Input Channel 3 | — | W54 | — | 0.5 | OEM-X-13 | — | — | — |
| 5 | Analog Input Channel 4 | — | W55 | — | 0.5 | OEM-X-78 | — | — | — |
| 6 | Analog Input Channel 5 | — | W56 | — | 0.5 | OEM-X-77 | — | — | — |
| 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 | — | W19 | — | 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 | — | W20 | — | 0.5 | SP-0V-1 | — | — | — |
| 26 | ECU Ground | — | W13 | — | 0.85 | SP-GND-1 | — | — | — |
| 27 | Digital Input 1 | — | W57 | — | 0.5 | OEM-X-42 | — | — | — |
| 28 | Digital Input 2 | — | — | — | — | — | — | — | — |
| 29 | Digital Input 3 | — | — | — | — | — | — | — | — |
| 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 + | — | W22 | — | 0.5 | OEM-X-16 | — | — | — |
| 5 | Crank Index Sensor - | — | W23 | — | 0.5 | SP-0V-1 | — | — | — |
| 6 | Sync Sensor + | — | W24 | — | 0.5 | OEM-X-17 | — | — | — |
| 7 | Sync Sensor - | — | W25 | — | 0.5 | SP-0V-1 | — | — | — |
| 8 | CAN 1H | — | — | — | — | — | — | — | — |
| 9 | EFI Relay Output (Low Side 200mA) | — | W43 | — | 0.5 | OEM-X-1 | — | — | — |
| 10 | CAN 2H | — | — | — | — | — | — | — | — |
| 11 | Knock 1 + | — | W26 | — | 0.5 | OEM-X-70 | — | — | — |
| 12 | Knock 1 - | — | — | — | — | — | — | — | — |
| 13 | Shield (Crank/Cam/ Knock) | — | W41 | — | 0.5 | SP-SHD-1 | — | — | — |
| 14 | CAN 1L | — | — | — | — | — | — | — | — |
| 15 | Ignition Switch Input | — | W42 | — | 0.5 | OEM-X-56 | — | — | — |
| 16 | CAN 2L | — | — | — | — | — | — | — | — |
| 17 | Knock 2 + | — | W27 | — | 0.5 | OEM-X-69 | — | — | — |
| 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 | — | W21 | — | 0.5 | OEM-X-59 | — | — | — |
| 22 | Sensor Supply Vref2: 5.0V | — | — | — | — | — | — | — | — |
| 23 | Ethernet Tx + | — | — | — | — | — | — | — | — |
| 24 | Ethernet Tx - | — | — | — | — | — | — | — | — |
| 25 | Ethernet Rx + | — | — | — | — | — | — | — | — |
| 26 | Ethernet Rx - | — | — | — | — | — | — | — | — |
OEM-X
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Fuel pump relay control | — | W43 | — | 0.5 | KV12-D-9 | — | — | — |
| 13 | O2 sensor signal | — | W54 | — | 0.5 | KV12-C-4 | — | — | — |
| 15 | Ground | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 16 | Crank position sensor (+) | — | W22 | — | 0.5 | KV12-D-4 | — | — | — |
| 17 | Camshaft position sensor (Hall) | — | W24 | — | 0.5 | KV12-D-6 | — | — | — |
| 2 | Idle speed control valve (close winding) | — | W46 | — | 0.5 | KV12-B-15 | — | — | — |
| 23 | Ignition coil cylinder 4 | — | W31 | — | 0.5 | KV12-B-29 | — | — | — |
| 24 | Ignition coil cylinder 6 | — | W33 | — | 0.5 | KV12-B-31 | — | — | — |
| 25 | Ignition coil cylinder 5 | — | W32 | — | 0.5 | KV12-B-30 | — | — | — |
| 26 | Battery voltage (constant +12V) | — | — | — | — | — | — | — | — |
| 27 | Main relay control | — | W44 | — | 0.5 | KV12-B-14 | — | — | — |
| 28 | Ground (electronics + sensor shielding) | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 29 | Idle speed control valve (open winding) | — | W47 | — | 0.5 | KV12-B-16 | — | — | — |
| 3 | Injector cylinder 5 | — | W38 | — | 0.5 | KV12-B-5 | — | — | — |
| 31 | Injector cylinder 3 | — | W36 | — | 0.5 | KV12-B-3 | — | — | — |
| 32 | Injector cylinder 2 | — | W35 | — | 0.5 | KV12-B-2 | — | — | — |
| 33 | Injector cylinder 1 | — | W34 | — | 0.5 | KV12-B-1 | — | — | — |
| 34 | Ground (output stages) | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 36 | Evap purge solenoid | — | W48 | — | 0.5 | KV12-B-17 | — | — | — |
| 38 | O2 sensor heater relay control | — | W45 | — | 0.5 | KV12-A-10 | — | — | — |
| 4 | Injector cylinder 6 | — | W39 | — | 0.5 | KV12-B-6 | — | — | — |
| 40 | O2 sensor signal ground | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 41 | Mass air flow (MAF) signal | — | W52 | — | 0.5 | KV12-C-2 | — | — | — |
| 42 | Vehicle speed signal | — | W57 | — | 0.5 | KV12-C-27 | — | — | — |
| 43 | Crank position sensor (-) | — | W16 | — | 0.5 | SP-0V-1 | — | — | — |
| 44 | Sensor ground (IAT/ECT/TPS) | — | W17 | — | 0.5 | SP-0V-1 | — | — | — |
| 45 | Shield ground | — | W40 | — | 0.5 | SP-SHD-1 | — | — | — |
| 47 | Tachometer output | — | W51 | — | 0.5 | KV12-B-12 | — | — | — |
| 5 | Injector cylinder 4 | — | W37 | — | 0.5 | KV12-B-4 | — | — | — |
| 50 | Ignition coil cylinder 1 | — | W28 | — | 0.5 | KV12-B-26 | — | — | — |
| 51 | Ignition coil cylinder 2 | — | W29 | — | 0.5 | KV12-B-27 | — | — | — |
| 52 | Ignition coil cylinder 3 | — | W30 | — | 0.5 | KV12-B-28 | — | — | — |
| 54 | ECU power (+14V from main relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 55 | Ground (ignition) | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 56 | Ignition switch (terminal 15) | — | W42 | — | 0.5 | KV12-D-15 | — | — | — |
| 59 | +5V sensor supply | — | W21 | — | 0.5 | KV12-D-21 | — | — | — |
| 6 | Ground (injector output stages) | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 69 | Knock sensor cylinders 4-6 | — | W27 | — | 0.5 | KV12-D-17 | — | — | — |
| 7 | VANOS intake camshaft solenoid | — | W49 | — | 0.5 | KV12-B-10 | — | — | — |
| 70 | Knock sensor cylinders 1-3 | — | W26 | — | 0.5 | KV12-D-11 | — | — | — |
| 71 | Knock sensor ground/shield | — | W18 | — | 0.5 | SP-0V-1 | — | — | — |
| 73 | Throttle position (TPS) | — | W53 | — | 0.5 | KV12-C-3 | — | — | — |
| 77 | Intake air temperature (IAT) | — | W56 | — | 0.5 | KV12-C-6 | — | — | — |
| 78 | Engine coolant temperature (ECT) | — | W55 | — | 0.5 | KV12-C-5 | — | — | — |
| 8 | Check engine light (MIL) | — | W50 | — | 0.5 | KV12-B-11 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W14 | — | 0.5 | OEM-X-28 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | OEM-X-40 | — | — | — |
| 1 | — | — | W16 | — | 0.5 | OEM-X-43 | — | — | — |
| 1 | — | — | W17 | — | 0.5 | OEM-X-44 | — | — | — |
| 1 | — | — | W18 | — | 0.5 | OEM-X-71 | — | — | — |
| 1 | — | — | W19 | — | 0.5 | KV12-C-17 | — | — | — |
| 1 | — | — | W20 | — | 0.5 | KV12-C-25 | — | — | — |
| 1 | — | — | W23 | — | 0.5 | KV12-D-5 | — | — | — |
| 1 | — | — | W25 | — | 0.5 | KV12-D-7 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-X-54 | — | — | — |
| 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-X-15 | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-X-34 | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-X-55 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | OEM-X-6 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | KV12-A-19 | — | — | — |
| 1 | — | — | W10 | — | 0.85 | KV12-B-34 | — | — | — |
| 1 | — | — | W11 | — | 0.85 | KV12-B-9 | — | — | — |
| 1 | — | — | W12 | — | 0.85 | KV12-C-1 | — | — | — |
| 1 | — | — | W13 | — | 0.85 | KV12-C-26 | — | — | — |
SP-SHD
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W40 | — | 0.5 | OEM-X-45 | — | — | — |
| 1 | — | — | W41 | — | 0.5 | KV12-D-13 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-X-1 | Fuel pump relay control | low_side_out | KV12-D-9 | EFI Relay Output (Low Side 200mA) | low_side_out | corroborated | |
| OEM-X-13 | O2 sensor signal | lambda_nb_in | KV12-C-4 | Analog Input Channel 3 | analog_in | corroborated | |
| OEM-X-15 | 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-X-16 | Crank position sensor (+) | trigger_in | KV12-D-4 | Crank Index Sensor + | trigger_in | corroborated | |
| OEM-X-17 | Camshaft position sensor (Hall) | trigger_in | KV12-D-6 | Sync Sensor + | trigger_in | corroborated | |
| OEM-X-2 | Idle speed control valve (close winding) | low_side_out | KV12-B-15 | Auxiliary Output 6 | low_side_out | corroborated | |
| OEM-X-23 | Ignition coil cylinder 4 | ignition_out | KV12-B-29 | Ignition Channel 4 | ignition_out | corroborated | |
| OEM-X-24 | Ignition coil cylinder 6 | ignition_out | KV12-B-31 | Ignition Channel 6 | ignition_out | corroborated | |
| OEM-X-25 | Ignition coil cylinder 5 | ignition_out | KV12-B-30 | Ignition Channel 5 | ignition_out | corroborated | |
| OEM-X-26 | Battery voltage (constant +12V) | power_in | — | — | — | corroborated | |
| OEM-X-27 | Main relay control | low_side_out | KV12-B-14 | Auxiliary Output 5 | low_side_out | corroborated | |
| OEM-X-28 | Ground (electronics + sensor shielding) | sensor_ground | KV12-C-17 + KV12-C-25 + KV12-D-5 + KV12-D-7 | Analog Sensor 0V Reference + Analog Sensor 0V Reference + Crank Index Sensor - + Sync Sensor - | sensor_ground + trigger_in | corroborated | |
| OEM-X-29 | Idle speed control valve (open winding) | low_side_out | KV12-B-16 | Auxiliary Output 7 | low_side_out | corroborated | |
| OEM-X-3 | Injector cylinder 5 | injector_out | KV12-B-5 | Injection Channel 5 | injector_out | corroborated | |
| OEM-X-31 | Injector cylinder 3 | injector_out | KV12-B-3 | Injection Channel 3 | injector_out | corroborated | |
| OEM-X-32 | Injector cylinder 2 | injector_out | KV12-B-2 | Injection Channel 2 | injector_out | corroborated | |
| OEM-X-33 | Injector cylinder 1 | injector_out | KV12-B-1 | Injection Channel 1 | injector_out | corroborated | |
| OEM-X-34 | Ground (output stages) | 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-X-36 | Evap purge solenoid | low_side_out | KV12-B-17 | Auxiliary Output 8 | low_side_out | corroborated | |
| OEM-X-38 | O2 sensor heater relay control | low_side_out | KV12-A-10 | Lambda 1 Heater - | low_side_out | corroborated | |
| OEM-X-4 | Injector cylinder 6 | injector_out | KV12-B-6 | Injection Channel 6 | injector_out | corroborated | |
| OEM-X-40 | O2 sensor signal ground | sensor_ground | KV12-C-17 + KV12-C-25 + KV12-D-5 + KV12-D-7 | Analog Sensor 0V Reference + Analog Sensor 0V Reference + Crank Index Sensor - + Sync Sensor - | sensor_ground + trigger_in | corroborated | |
| OEM-X-41 | Mass air flow (MAF) signal | analog_in | KV12-C-2 | Analog Input Channel 1 | analog_in | corroborated | |
| OEM-X-42 | Vehicle speed signal | digital_in | KV12-C-27 | Digital Input 1 | digital_in | corroborated | |
| OEM-X-43 | Crank position sensor (-) | sensor_ground | KV12-C-17 + KV12-C-25 + KV12-D-5 + KV12-D-7 | Analog Sensor 0V Reference + Analog Sensor 0V Reference + Crank Index Sensor - + Sync Sensor - | sensor_ground + trigger_in | corroborated | |
| OEM-X-44 | Sensor ground (IAT/ECT/TPS) | sensor_ground | KV12-C-17 + KV12-C-25 + KV12-D-5 + KV12-D-7 | Analog Sensor 0V Reference + Analog Sensor 0V Reference + Crank Index Sensor - + Sync Sensor - | sensor_ground + trigger_in | corroborated | |
| OEM-X-45 | Shield ground | shield | KV12-D-13 | Shield (Crank/Cam/ Knock) | shield | corroborated | |
| OEM-X-47 | Tachometer output | tacho_out | KV12-B-12 | Auxiliary Output 3 | low_side_out | corroborated | |
| OEM-X-5 | Injector cylinder 4 | injector_out | KV12-B-4 | Injection Channel 4 | injector_out | corroborated | |
| OEM-X-50 | Ignition coil cylinder 1 | ignition_out | KV12-B-26 | Ignition Channel 1 | ignition_out | corroborated | |
| OEM-X-51 | Ignition coil cylinder 2 | ignition_out | KV12-B-27 | Ignition Channel 2 | ignition_out | corroborated | |
| OEM-X-52 | Ignition coil cylinder 3 | ignition_out | KV12-B-28 | Ignition Channel 3 | ignition_out | corroborated | |
| OEM-X-54 | ECU power (+14V from main 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-X-55 | Ground (ignition) | 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-X-56 | Ignition switch (terminal 15) | digital_in | KV12-D-15 | Ignition Switch Input | digital_in | corroborated | |
| OEM-X-59 | +5V sensor supply | vref | KV12-D-21 | Sensor Supply Vref1: 5.0V | vref | corroborated | |
| OEM-X-6 | Ground (injector output stages) | 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-X-69 | Knock sensor cylinders 4-6 | knock_in | KV12-D-17 | Knock 2 + | knock_in | corroborated | |
| OEM-X-7 | VANOS intake camshaft solenoid | low_side_out | KV12-B-10 | Auxiliary Output 1 | low_side_out | corroborated | |
| OEM-X-70 | Knock sensor cylinders 1-3 | knock_in | KV12-D-11 | Knock 1 + | knock_in | corroborated | |
| OEM-X-71 | Knock sensor ground/shield | sensor_ground | KV12-C-17 + KV12-C-25 + KV12-D-5 + KV12-D-7 | Analog Sensor 0V Reference + Analog Sensor 0V Reference + Crank Index Sensor - + Sync Sensor - | sensor_ground + trigger_in | corroborated | |
| OEM-X-73 | Throttle position (TPS) | analog_in | KV12-C-3 | Analog Input Channel 2 | analog_in | corroborated | |
| OEM-X-77 | Intake air temperature (IAT) | temp_in | KV12-C-6 | Analog Input Channel 5 | analog_in | corroborated | |
| OEM-X-78 | Engine coolant temperature (ECT) | temp_in | KV12-C-5 | Analog Input Channel 4 | analog_in | corroborated | |
| OEM-X-8 | Check engine light (MIL) | low_side_out | KV12-B-11 | Auxiliary Output 2 | low_side_out | corroborated |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-X-54 | SP-14V-1 | 0.85 | no route | ECU power (+14V from main 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-X-15 | SP-GND-1 | 0.85 | no route | Ground | — | |
| W6 | OEM-X-34 | SP-GND-1 | 0.85 | no route | Ground (output stages) | — | |
| W7 | OEM-X-55 | SP-GND-1 | 0.85 | no route | Ground (ignition) | — | |
| W8 | OEM-X-6 | SP-GND-1 | 0.85 | no route | Ground (injector output stages) | — | |
| W9 | SP-GND-1 | KV12-A-19 | 0.85 | no route | ECU Ground | — | |
| W10 | SP-GND-1 | KV12-B-34 | 0.85 | no route | ECU Ground | — | |
| W11 | SP-GND-1 | KV12-B-9 | 0.85 | no route | ECU Ground | — | |
| W12 | SP-GND-1 | KV12-C-1 | 0.85 | no route | ECU Ground | — | |
| W13 | SP-GND-1 | KV12-C-26 | 0.85 | no route | ECU Ground | — | |
| W14 | OEM-X-28 | SP-0V-1 | 0.5 | no route | Ground (electronics + sensor shielding) | — | |
| W15 | OEM-X-40 | SP-0V-1 | 0.5 | no route | O2 sensor signal ground | — | |
| W16 | OEM-X-43 | SP-0V-1 | 0.5 | no route | Crank position sensor (-) | — | |
| W17 | OEM-X-44 | SP-0V-1 | 0.5 | no route | Sensor ground (IAT/ECT/TPS) | — | |
| W18 | OEM-X-71 | SP-0V-1 | 0.5 | no route | Knock sensor ground/shield | — | |
| W19 | SP-0V-1 | KV12-C-17 | 0.5 | no route | Analog Sensor 0V Reference | — | |
| W20 | SP-0V-1 | KV12-C-25 | 0.5 | no route | Analog Sensor 0V Reference | — | |
| W21 | OEM-X-59 | KV12-D-21 | 0.5 | no route | +5V sensor supply | — | |
| W22 | OEM-X-16 | KV12-D-4 | 0.5 | no route | Crank position sensor (+) | — | |
| W23 | SP-0V-1 | KV12-D-5 | 0.5 | no route | Crank Index Sensor - | — | |
| W24 | OEM-X-17 | KV12-D-6 | 0.5 | no route | Camshaft position sensor (Hall) | — | |
| W25 | SP-0V-1 | KV12-D-7 | 0.5 | no route | Sync Sensor - | — | |
| W26 | OEM-X-70 | KV12-D-11 | 0.5 | no route | Knock sensor cylinders 1-3 | — | |
| W27 | OEM-X-69 | KV12-D-17 | 0.5 | no route | Knock sensor cylinders 4-6 | — | |
| W28 | OEM-X-50 | KV12-B-26 | 0.5 | no route | Ignition coil cylinder 1 | — | |
| W29 | OEM-X-51 | KV12-B-27 | 0.5 | no route | Ignition coil cylinder 2 | — | |
| W30 | OEM-X-52 | KV12-B-28 | 0.5 | no route | Ignition coil cylinder 3 | — | |
| W31 | OEM-X-23 | KV12-B-29 | 0.5 | no route | Ignition coil cylinder 4 | — | |
| W32 | OEM-X-25 | KV12-B-30 | 0.5 | no route | Ignition coil cylinder 5 | — | |
| W33 | OEM-X-24 | KV12-B-31 | 0.5 | no route | Ignition coil cylinder 6 | — | |
| W34 | OEM-X-33 | KV12-B-1 | 0.5 | no route | Injector cylinder 1 | — | |
| W35 | OEM-X-32 | KV12-B-2 | 0.5 | no route | Injector cylinder 2 | — | |
| W36 | OEM-X-31 | KV12-B-3 | 0.5 | no route | Injector cylinder 3 | — | |
| W37 | OEM-X-5 | KV12-B-4 | 0.5 | no route | Injector cylinder 4 | — | |
| W38 | OEM-X-3 | KV12-B-5 | 0.5 | no route | Injector cylinder 5 | — | |
| W39 | OEM-X-4 | KV12-B-6 | 0.5 | no route | Injector cylinder 6 | — | |
| W40 | OEM-X-45 | SP-SHD-1 | 0.5 | no route | Shield ground | — | |
| W41 | SP-SHD-1 | KV12-D-13 | 0.5 | no route | Shield (Crank/Cam/ Knock) | — | |
| W42 | OEM-X-56 | KV12-D-15 | 0.5 | no route | Ignition switch (terminal 15) | — | |
| W43 | OEM-X-1 | KV12-D-9 | 0.5 | no route | Fuel pump relay control | — | |
| W44 | OEM-X-27 | KV12-B-14 | 0.5 | no route | Main relay control | — | |
| W45 | OEM-X-38 | KV12-A-10 | 0.5 | no route | O2 sensor heater relay control | — | |
| W46 | OEM-X-2 | KV12-B-15 | 0.5 | no route | Idle speed control valve (close winding) | — | |
| W47 | OEM-X-29 | KV12-B-16 | 0.5 | no route | Idle speed control valve (open winding) | — | |
| W48 | OEM-X-36 | KV12-B-17 | 0.5 | no route | Evap purge solenoid | — | |
| W49 | OEM-X-7 | KV12-B-10 | 0.5 | no route | VANOS intake camshaft solenoid | — | |
| W50 | OEM-X-8 | KV12-B-11 | 0.5 | no route | Check engine light (MIL) | — | |
| W51 | OEM-X-47 | KV12-B-12 | 0.5 | no route | Tachometer output | — | |
| W52 | OEM-X-41 | KV12-C-2 | 0.5 | no route | Mass air flow (MAF) signal | — | |
| W53 | OEM-X-73 | KV12-C-3 | 0.5 | no route | Throttle position (TPS) | — | |
| W54 | OEM-X-13 | KV12-C-4 | 0.5 | no route | O2 sensor signal | — | |
| W55 | OEM-X-78 | KV12-C-5 | 0.5 | no route | Engine coolant temperature (ECT) | — | |
| W56 | OEM-X-77 | KV12-C-6 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W57 | OEM-X-42 | KV12-C-27 | 0.5 | no route | Vehicle speed 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 |
| connector | BMW-E36-DME-CONN | BMW | E36 DME (M3.1/M3.3.1) harness connector | 1.000 | ea |
| terminal | 3-1447221-4 | TE | Superseal 1.0 socket terminal, 20 AWG (0.5 sq mm) | 46.000 | 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 |
|---|---|---|---|
| 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-X-44 ↔ KV12-D-7 | OEM-X-44 "Sensor ground (IAT/ECT/TPS)" [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-X-47 ↔ KV12-B-12 | OEM-X-47 "Tachometer output" [tacho_out] is wired to KV12-B-12 "Auxiliary Output 3" [low_side_out]. Tacho as a low-side output: check the tach needs a pull-up. |
| info | NET_FAMILY | OEM-X-77 ↔ KV12-C-6 | OEM-X-77 "Intake air temperature (IAT)" [temp_in] is wired to KV12-C-6 "Analog Input Channel 5" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | NET_FAMILY | OEM-X-78 ↔ KV12-C-5 | OEM-X-78 "Engine coolant temperature (ECT)" [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 (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-X-26 | Battery-constant (memory) feed of the stock ECU: the new ECU has no such input, so it is not needed. | mapping-proposal |
Notes
Fit check: unconfirmed. Confirm these before building: - Trigger pattern for BMW M50 not found in the ECU's docs (SL-series lists only generic Crank Index + Sync inputs; no BMW trigger preset) - This car has EWS-II/III (late E36) immobilizer; needs a delete/bypass Auto-mapped by auto_map() from the library pin data on 2026-10-06. Review every wire against both manuals before building. Not wired: - OEM-X 26: Battery voltage (constant +12V): Emtron KV12 has no battery-constant input; not needed - 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 18: Knock 2 - left open: the stock knock sensor has one ECU wire; check the ECU manual for single-wire knock sensors
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 |
| 4 | vendor_doc | Link BMWLink E36X (G4X) plug-in install manual | https://linkecu.com/documentation/E36X.pdf | archive | 2026-10-05 | 010cda3acd08 |
| 2 | community_copy | bimmer-service: Bosch Motronic M3.3.1 pinout (E36 M50) | https://www.bimmer-service.com/2025/11/17/bosch-motronic-m3-3-1-pinout-wiring-diagram/ | — | — | — |