VW Golf Mk4 1.8T 20v (AUM, Bosch ME7.5) DBW → Emtron KV12 (auto)
VW Golf Mk4 1.8T 20v (AUM, Bosch ME7.5) DBW — 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 | none |
| Size of the job | 72 wires · 10 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-T121-121 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | OEM-T121-21 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-14V-1 | KV12-D-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | SP-14V-1 | KV12-D-2 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | SP-14V-1 | KV12-D-20 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-T121-1 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-T121-2 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | KV12-A-19 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | KV12-B-34 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-GND-1 | KV12-B-9 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-GND-1 | KV12-C-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | SP-GND-1 | KV12-C-26 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-T121-108 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-T121-29 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-T121-34 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-T121-36 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-T121-90 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-T121-91 | 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-T121-72 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-T121-83 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-T121-99 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | SP-5V1-1 | KV12-D-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-T121-73 | SP-5V2-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-T121-98 | SP-5V2-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | SP-5V2-1 | KV12-D-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-T121-82 | KV12-D-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | SP-0V-1 | KV12-D-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-T121-86 | KV12-D-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | SP-0V-1 | KV12-D-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-T121-106 | KV12-D-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-T121-107 | KV12-D-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-T121-102 | KV12-B-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-T121-95 | KV12-B-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-T121-103 | KV12-B-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-T121-94 | KV12-B-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-T121-96 | KV12-B-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-T121-89 | KV12-B-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-T121-97 | KV12-B-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-T121-88 | KV12-B-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-T121-118 | KV12-B-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-T121-117 | KV12-B-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-T121-3 | KV12-D-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-T121-53 | KV12-C-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-T121-101 | KV12-C-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-T121-33 | KV12-C-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | OEM-T121-84 | KV12-C-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W49 | OEM-T121-35 | KV12-C-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W50 | OEM-T121-92 | KV12-C-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W51 | OEM-T121-93 | KV12-C-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W52 | OEM-T121-65 | KV12-D-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W53 | OEM-T121-66 | KV12-B-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W54 | OEM-T121-5 | KV12-A-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W55 | OEM-T121-63 | KV12-A-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W56 | OEM-T121-104 | KV12-B-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W57 | OEM-T121-105 | KV12-B-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W58 | OEM-T121-115 | KV12-B-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W59 | OEM-T121-47 | KV12-B-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W60 | OEM-T121-48 | KV12-B-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W61 | OEM-T121-64 | KV12-B-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W62 | OEM-T121-9 | KV12-B-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W63 | OEM-T121-51 | KV12-A-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W64 | OEM-T121-52 | KV12-A-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W65 | OEM-T121-70 | KV12-A-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W66 | OEM-T121-71 | KV12-A-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W67 | OEM-T121-68 | KV12-C-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W68 | OEM-T121-69 | KV12-C-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W69 | OEM-T121-85 | KV12-C-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W70 | OEM-T121-54 | KV12-C-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W71 | OEM-T121-60 | KV12-D-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W72 | OEM-T121-58 | KV12-D-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ |
Bench test (before first power-up)
Battery disconnected, ECU and every sensor unplugged. Meter on resistance. Each pair below must read open (OL): a reading means a pinched wire, a stray strand or a mis-pinned cavity. Then check continuity of every wire (last column of the build checklist).
| # | Probe A | Probe B | Expect | Why | Reading |
|---|---|---|---|---|---|
| 1 | 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-A-19 | KV12-D-22 | open (OL) | power ground must not touch 5 V sensor reference | |
| 4 | KV12-C-17 | KV12-D-1 | open (OL) | sensor ground must not touch +12 V supply | |
| 5 | KV12-C-17 | KV12-D-21 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 6 | KV12-C-17 | KV12-D-22 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 7 | KV12-D-1 | KV12-D-21 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 8 | KV12-D-1 | KV12-D-22 | 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 - | — | W54 | — | 0.5 | OEM-T121-5 | — | — | — |
| 11 | Lambda 2 Heater - | — | W55 | — | 0.5 | OEM-T121-63 | — | — | — |
| 12 | — | — | — | — | — | — | — | — | — |
| 13 | — | — | — | — | — | — | — | — | — |
| 14 | Ignition Channel 11 | — | — | — | — | — | — | — | — |
| 15 | Ignition Channel 12 | — | — | — | — | — | — | — | — |
| 16 | Lambda 1 Heater + | — | — | — | — | — | — | — | — |
| 17 | Lambda 2 Heater + | — | — | — | — | — | — | — | — |
| 18 | Lambda 1 Nernst Cell (Vs) | — | W65 | — | 0.5 | OEM-T121-70 | — | — | — |
| 19 | ECU Ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 20 | Lambda 2 Cal Resistor (CalR) | — | — | — | — | — | — | — | — |
| 21 | Lambda 2 Nernst Cell (Vs) | — | W66 | — | 0.5 | OEM-T121-71 | — | — | — |
| 22 | Lambda 2 Pump Cell (Ip) | — | W64 | — | 0.5 | OEM-T121-52 | — | — | — |
| 23 | Lambda 2 Virtual Ground (VGnd) | — | — | — | — | — | — | — | — |
| 24 | Lambda 1 Cal Resistor (CalR) | — | — | — | — | — | — | — | — |
| 25 | Lambda 1 Pump Cell (Ip) | — | W63 | — | 0.5 | OEM-T121-51 | — | — | — |
| 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 | — | W38 | — | 0.5 | OEM-T121-96 | — | — | — |
| 2 | Injection Channel 2 | — | W39 | — | 0.5 | OEM-T121-89 | — | — | — |
| 3 | Injection Channel 3 | — | W40 | — | 0.5 | OEM-T121-97 | — | — | — |
| 4 | Injection Channel 4 | — | W41 | — | 0.5 | OEM-T121-88 | — | — | — |
| 5 | Injection Channel 5 | — | — | — | — | — | — | — | — |
| 6 | Injection Channel 6 | — | — | — | — | — | — | — | — |
| 7 | Injection Channel 7 | — | — | — | — | — | — | — | — |
| 8 | Injection Channel 8 | — | — | — | — | — | — | — | — |
| 9 | ECU Ground | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
| 10 | Auxiliary Output 1 | — | W59 | — | 0.5 | OEM-T121-47 | — | — | — |
| 11 | Auxiliary Output 2 | — | W60 | — | 0.5 | OEM-T121-48 | — | — | — |
| 12 | Auxiliary Output 3 | — | W61 | — | 0.5 | OEM-T121-64 | — | — | — |
| 13 | Auxiliary Output 4 | — | W62 | — | 0.5 | OEM-T121-9 | — | — | — |
| 14 | Auxiliary Output 5 | — | W53 | — | 0.5 | OEM-T121-66 | — | — | — |
| 15 | Auxiliary Output 6 | — | W56 | — | 0.5 | OEM-T121-104 | — | — | — |
| 16 | Auxiliary Output 7 | — | W57 | — | 0.5 | OEM-T121-105 | — | — | — |
| 17 | Auxiliary Output 8 | — | W58 | — | 0.5 | OEM-T121-115 | — | — | — |
| 18 | Auxiliary Output 9 | — | W43 | — | 0.5 | OEM-T121-117 | — | — | — |
| 19 | Auxiliary Output 10 | — | W42 | — | 0.5 | OEM-T121-118 | — | — | — |
| 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 | — | W34 | — | 0.5 | OEM-T121-102 | — | — | — |
| 27 | Ignition Channel 2 | — | W35 | — | 0.5 | OEM-T121-95 | — | — | — |
| 28 | Ignition Channel 3 | — | W36 | — | 0.5 | OEM-T121-103 | — | — | — |
| 29 | Ignition Channel 4 | — | W37 | — | 0.5 | OEM-T121-94 | — | — | — |
| 30 | Ignition Channel 5 | — | — | — | — | — | — | — | — |
| 31 | Ignition Channel 6 | — | — | — | — | — | — | — | — |
| 32 | Ignition Channel 7 | — | — | — | — | — | — | — | — |
| 33 | Ignition Channel 8 | — | — | — | — | — | — | — | — |
| 34 | ECU Ground | — | W9 | — | 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 | — | W11 | — | 0.85 | SP-GND-1 | — | — | — |
| 2 | Analog Input Channel 1 | — | W45 | — | 0.5 | OEM-T121-53 | — | — | — |
| 3 | Analog Input Channel 2 | — | W46 | — | 0.5 | OEM-T121-101 | — | — | — |
| 4 | Analog Input Channel 3 | — | W47 | — | 0.5 | OEM-T121-33 | — | — | — |
| 5 | Analog Input Channel 4 | — | W48 | — | 0.5 | OEM-T121-84 | — | — | — |
| 6 | Analog Input Channel 5 | — | W49 | — | 0.5 | OEM-T121-35 | — | — | — |
| 7 | Analog Input Channel 6 | — | W50 | — | 0.5 | OEM-T121-92 | — | — | — |
| 8 | Analog Input Channel 7 | — | W51 | — | 0.5 | OEM-T121-93 | — | — | — |
| 9 | Analog Input Channel 8 | — | W67 | — | 0.5 | OEM-T121-68 | — | — | — |
| 10 | Analog Input Channel 9 | — | W68 | — | 0.5 | OEM-T121-69 | — | — | — |
| 11 | Analog Input Channel 10 | — | W69 | — | 0.5 | OEM-T121-85 | — | — | — |
| 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 | — | W12 | — | 0.85 | SP-GND-1 | — | — | — |
| 27 | Digital Input 1 | — | W70 | — | 0.5 | OEM-T121-54 | — | — | — |
| 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 | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 2 | Auxiliary Output 13-16 14V Supply | — | W4 | — | 0.85 | SP-14V-1 | — | — | — |
| 3 | Sensor Supply 8V | — | — | — | — | — | — | — | — |
| 4 | Crank Index Sensor + | — | W28 | — | 0.5 | OEM-T121-82 | — | — | — |
| 5 | Crank Index Sensor - | — | W29 | — | 0.5 | SP-0V-1 | — | — | — |
| 6 | Sync Sensor + | — | W30 | — | 0.5 | OEM-T121-86 | — | — | — |
| 7 | Sync Sensor - | — | W31 | — | 0.5 | SP-0V-1 | — | — | — |
| 8 | CAN 1H | — | W71 | — | 0.5 | OEM-T121-60 | — | — | — |
| 9 | EFI Relay Output (Low Side 200mA) | — | W52 | — | 0.5 | OEM-T121-65 | — | — | — |
| 10 | CAN 2H | — | — | — | — | — | — | — | — |
| 11 | Knock 1 + | — | W32 | — | 0.5 | OEM-T121-106 | — | — | — |
| 12 | Knock 1 - | — | — | — | — | — | — | — | — |
| 13 | Shield (Crank/Cam/ Knock) | — | — | — | — | — | — | — | — |
| 14 | CAN 1L | — | W72 | — | 0.5 | OEM-T121-58 | — | — | — |
| 15 | Ignition Switch Input | — | W44 | — | 0.5 | OEM-T121-3 | — | — | — |
| 16 | CAN 2L | — | — | — | — | — | — | — | — |
| 17 | Knock 2 + | — | W33 | — | 0.5 | OEM-T121-107 | — | — | — |
| 18 | Knock 2 - | — | — | — | — | — | — | — | — |
| 19 | Analog Output (0.0 - 5.0V) | — | — | — | — | — | — | — | — |
| 20 | Auxiliary Output 9-12 14V Supply | — | W5 | — | 0.85 | SP-14V-1 | — | — | — |
| 21 | Sensor Supply Vref1: 5.0V | — | W24 | — | 0.5 | SP-5V1-1 | — | — | — |
| 22 | Sensor Supply Vref2: 5.0V | — | W27 | — | 0.5 | SP-5V2-1 | — | — | — |
| 23 | Ethernet Tx + | — | — | — | — | — | — | — | — |
| 24 | Ethernet Tx - | — | — | — | — | — | — | — | — |
| 25 | Ethernet Rx + | — | — | — | — | — | — | — | — |
| 26 | Ethernet Rx - | — | — | — | — | — | — | — | — |
OEM-T121
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | ECU ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 101 | Boost pressure sensor (G31) | — | W46 | — | 0.5 | KV12-C-3 | — | — | — |
| 102 | Ignition coil 1 (N127) | — | W34 | — | 0.5 | KV12-B-26 | — | — | — |
| 103 | Ignition coil 3 (N158) | — | W36 | — | 0.5 | KV12-B-28 | — | — | — |
| 104 | Boost control solenoid (N75) | — | W56 | — | 0.5 | KV12-B-15 | — | — | — |
| 105 | Diverter valve (N249) | — | W57 | — | 0.5 | KV12-B-16 | — | — | — |
| 106 | Knock sensor 1 (G61) | — | W32 | — | 0.5 | KV12-D-11 | — | — | — |
| 107 | Knock sensor 2 (G66) | — | W33 | — | 0.5 | KV12-D-17 | — | — | — |
| 108 | Sensor ground | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 115 | VVT camshaft adjustment valve (N205) | — | W58 | — | 0.5 | KV12-B-17 | — | — | — |
| 117 | Throttle motor G186 (+) | — | W43 | — | 0.5 | KV12-B-18 | — | — | — |
| 118 | Throttle motor G186 (−) | — | W42 | — | 0.5 | KV12-B-19 | — | — | — |
| 121 | ECM + coil power (J271 relay feed) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 2 | ECU ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 21 | ECM power (J271 relay feed) | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 27 | MAF sensor supply (G70) | — | — | — | — | — | — | — | — |
| 29 | MAF sensor ground (G70) | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 3 | Ignition switch +12V (term 15) | — | W44 | — | 0.5 | KV12-D-15 | — | — | — |
| 33 | Accelerator pedal position 1 (G79) | — | W47 | — | 0.5 | KV12-C-4 | — | — | — |
| 34 | Accelerator pedal position 1 ground (G79) | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 35 | Accelerator pedal position 2 (G185) | — | W49 | — | 0.5 | KV12-C-6 | — | — | — |
| 36 | Accelerator pedal position 2 ground (G185) | — | W16 | — | 0.5 | SP-0V-1 | — | — | — |
| 37 | Engine speed signal (tacho to cluster) | — | — | — | — | — | — | — | — |
| 43 | K-line diagnostics (OBD pin 7) | — | — | — | — | — | — | — | — |
| 47 | Check engine light (MIL) | — | W59 | — | 0.5 | KV12-B-10 | — | — | — |
| 48 | EPC warning light | — | W60 | — | 0.5 | KV12-B-11 | — | — | — |
| 5 | Wideband lambda heater (Z19) | — | W54 | — | 0.5 | KV12-A-10 | — | — | — |
| 51 | Wideband lambda pump (G39) | — | W63 | — | 0.5 | KV12-A-25 | — | — | — |
| 52 | Wideband lambda pump (G39) | — | W64 | — | 0.5 | KV12-A-22 | — | — | — |
| 53 | MAF sensor signal (G70) | — | W45 | — | 0.5 | KV12-C-2 | — | — | — |
| 54 | Road speed signal (VSS) | — | W70 | — | 0.5 | KV12-C-27 | — | — | — |
| 58 | CAN bus low | — | W72 | — | 0.5 | KV12-D-14 | — | — | — |
| 60 | CAN bus high | — | W71 | — | 0.5 | KV12-D-8 | — | — | — |
| 62 | Battery constant +12V (term 30) | — | — | — | — | — | — | — | — |
| 63 | Post-cat lambda heater (Z29) | — | W55 | — | 0.5 | KV12-A-11 | — | — | — |
| 64 | EVAP canister valve (N80) | — | W61 | — | 0.5 | KV12-B-12 | — | — | — |
| 65 | Fuel pump relay control | — | W52 | — | 0.5 | KV12-D-9 | — | — | — |
| 66 | Secondary-air pump relay (J299) | — | W53 | — | 0.5 | KV12-B-14 | — | — | — |
| 68 | Post-cat lambda signal (G130) | — | W67 | — | 0.5 | KV12-C-9 | — | — | — |
| 69 | Post-cat lambda signal (G130) | — | W68 | — | 0.5 | KV12-C-10 | — | — | — |
| 70 | Wideband lambda Nernst signal (G39) | — | W65 | — | 0.5 | KV12-A-18 | — | — | — |
| 71 | Wideband lambda Nernst signal (G39) | — | W66 | — | 0.5 | KV12-A-21 | — | — | — |
| 72 | Accelerator pedal position 1 5V supply (G79) | — | W21 | — | 0.5 | SP-5V1-1 | — | — | — |
| 73 | Accelerator pedal position 2 5V supply (G185) | — | W25 | — | 0.5 | SP-5V2-1 | — | — | — |
| 82 | Crank position sensor (G28) | — | W28 | — | 0.5 | KV12-D-4 | — | — | — |
| 83 | Throttle position sensor 5V supply (G187/G188) | — | W22 | — | 0.5 | SP-5V1-1 | — | — | — |
| 84 | Throttle position sensor 1 (G187) | — | W48 | — | 0.5 | KV12-C-5 | — | — | — |
| 85 | Intake air temperature (G42) | — | W69 | — | 0.5 | KV12-C-11 | — | — | — |
| 86 | Camshaft position sensor (G40) | — | W30 | — | 0.5 | KV12-D-6 | — | — | — |
| 88 | Injector 4 (N33) | — | W41 | — | 0.5 | KV12-B-4 | — | — | — |
| 89 | Injector 2 (N31) | — | W39 | — | 0.5 | KV12-B-2 | — | — | — |
| 9 | Secondary-air injection valve (N112) | — | W62 | — | 0.5 | KV12-B-13 | — | — | — |
| 90 | Crank position sensor ground (G28) | — | W17 | — | 0.5 | SP-0V-1 | — | — | — |
| 91 | Throttle position sensor ground (G187/G188) | — | W18 | — | 0.5 | SP-0V-1 | — | — | — |
| 92 | Throttle position sensor 2 (G188) | — | W50 | — | 0.5 | KV12-C-7 | — | — | — |
| 93 | Engine coolant temperature (G62) | — | W51 | — | 0.5 | KV12-C-8 | — | — | — |
| 94 | Ignition coil 4 (N163) | — | W37 | — | 0.5 | KV12-B-29 | — | — | — |
| 95 | Ignition coil 2 (N128) | — | W35 | — | 0.5 | KV12-B-27 | — | — | — |
| 96 | Injector 1 (N30) | — | W38 | — | 0.5 | KV12-B-1 | — | — | — |
| 97 | Injector 3 (N32) | — | W40 | — | 0.5 | KV12-B-3 | — | — | — |
| 98 | Cam + boost sensor 5V supply (G40/G31) | — | W26 | — | 0.5 | SP-5V2-1 | — | — | — |
| 99 | Knock sensor 5V supply (G61/G66) | — | W23 | — | 0.5 | SP-5V1-1 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W13 | — | 0.5 | OEM-T121-108 | — | — | — |
| 1 | — | — | W14 | — | 0.5 | OEM-T121-29 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | OEM-T121-34 | — | — | — |
| 1 | — | — | W16 | — | 0.5 | OEM-T121-36 | — | — | — |
| 1 | — | — | W17 | — | 0.5 | OEM-T121-90 | — | — | — |
| 1 | — | — | W18 | — | 0.5 | OEM-T121-91 | — | — | — |
| 1 | — | — | W19 | — | 0.5 | KV12-C-17 | — | — | — |
| 1 | — | — | W20 | — | 0.5 | KV12-C-25 | — | — | — |
| 1 | — | — | W29 | — | 0.5 | KV12-D-5 | — | — | — |
| 1 | — | — | W31 | — | 0.5 | KV12-D-7 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-T121-121 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | OEM-T121-21 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | KV12-D-1 | — | — | — |
| 1 | — | — | W4 | — | 0.85 | KV12-D-2 | — | — | — |
| 1 | — | — | W5 | — | 0.85 | KV12-D-20 | — | — | — |
SP-5V1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W21 | — | 0.5 | OEM-T121-72 | — | — | — |
| 1 | — | — | W22 | — | 0.5 | OEM-T121-83 | — | — | — |
| 1 | — | — | W23 | — | 0.5 | OEM-T121-99 | — | — | — |
| 1 | — | — | W24 | — | 0.5 | KV12-D-21 | — | — | — |
SP-5V2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W25 | — | 0.5 | OEM-T121-73 | — | — | — |
| 1 | — | — | W26 | — | 0.5 | OEM-T121-98 | — | — | — |
| 1 | — | — | W27 | — | 0.5 | KV12-D-22 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W6 | — | 0.85 | OEM-T121-1 | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-T121-2 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | KV12-A-19 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | KV12-B-34 | — | — | — |
| 1 | — | — | W10 | — | 0.85 | KV12-B-9 | — | — | — |
| 1 | — | — | W11 | — | 0.85 | KV12-C-1 | — | — | — |
| 1 | — | — | W12 | — | 0.85 | KV12-C-26 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-T121-1 | ECU 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-T121-101 | Boost pressure sensor (G31) | analog_in | KV12-C-3 | Analog Input Channel 2 | analog_in | corroborated | |
| OEM-T121-102 | Ignition coil 1 (N127) | ignition_out | KV12-B-26 | Ignition Channel 1 | ignition_out | corroborated | |
| OEM-T121-103 | Ignition coil 3 (N158) | ignition_out | KV12-B-28 | Ignition Channel 3 | ignition_out | corroborated | |
| OEM-T121-104 | Boost control solenoid (N75) | low_side_out | KV12-B-15 | Auxiliary Output 6 | low_side_out | corroborated | |
| OEM-T121-105 | Diverter valve (N249) | low_side_out | KV12-B-16 | Auxiliary Output 7 | low_side_out | corroborated | |
| OEM-T121-106 | Knock sensor 1 (G61) | knock_in | KV12-D-11 | Knock 1 + | knock_in | corroborated | |
| OEM-T121-107 | Knock sensor 2 (G66) | knock_in | KV12-D-17 | Knock 2 + | knock_in | corroborated | |
| OEM-T121-108 | Sensor 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-T121-115 | VVT camshaft adjustment valve (N205) | low_side_out | KV12-B-17 | Auxiliary Output 8 | low_side_out | corroborated | |
| OEM-T121-117 | Throttle motor G186 (+) | hbridge_out | KV12-B-18 | Auxiliary Output 9 | hbridge_out | corroborated | |
| OEM-T121-118 | Throttle motor G186 (−) | hbridge_out | KV12-B-19 | Auxiliary Output 10 | hbridge_out | corroborated | |
| OEM-T121-121 | ECM + coil power (J271 relay feed) | 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-T121-2 | ECU 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-T121-21 | ECM power (J271 relay feed) | 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-T121-27 | MAF sensor supply (G70) | power_in | — | — | — | corroborated | |
| OEM-T121-29 | MAF sensor ground (G70) | 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-T121-3 | Ignition switch +12V (term 15) | digital_in | KV12-D-15 | Ignition Switch Input | digital_in | corroborated | |
| OEM-T121-33 | Accelerator pedal position 1 (G79) | analog_in | KV12-C-4 | Analog Input Channel 3 | analog_in | corroborated | |
| OEM-T121-34 | Accelerator pedal position 1 ground (G79) | 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-T121-35 | Accelerator pedal position 2 (G185) | analog_in | KV12-C-6 | Analog Input Channel 5 | analog_in | corroborated | |
| OEM-T121-36 | Accelerator pedal position 2 ground (G185) | 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-T121-37 | Engine speed signal (tacho to cluster) | tacho_out | — | — | — | corroborated | |
| OEM-T121-43 | K-line diagnostics (OBD pin 7) | serial | — | — | — | corroborated | |
| OEM-T121-47 | Check engine light (MIL) | low_side_out | KV12-B-10 | Auxiliary Output 1 | low_side_out | corroborated | |
| OEM-T121-48 | EPC warning light | low_side_out | KV12-B-11 | Auxiliary Output 2 | low_side_out | corroborated | |
| OEM-T121-5 | Wideband lambda heater (Z19) | low_side_out | KV12-A-10 | Lambda 1 Heater - | low_side_out | corroborated | |
| OEM-T121-51 | Wideband lambda pump (G39) | wb_ip | KV12-A-25 | Lambda 1 Pump Cell (Ip) | wb_ip | corroborated | |
| OEM-T121-52 | Wideband lambda pump (G39) | wb_ip | KV12-A-22 | Lambda 2 Pump Cell (Ip) | wb_ip | corroborated | |
| OEM-T121-53 | MAF sensor signal (G70) | analog_in | KV12-C-2 | Analog Input Channel 1 | analog_in | corroborated | |
| OEM-T121-54 | Road speed signal (VSS) | digital_in | KV12-C-27 | Digital Input 1 | digital_in | corroborated | |
| OEM-T121-58 | CAN bus low | can_l | KV12-D-14 | CAN 1L | can_l | corroborated | |
| OEM-T121-60 | CAN bus high | can_h | KV12-D-8 | CAN 1H | can_h | corroborated | |
| OEM-T121-62 | Battery constant +12V (term 30) | power_in | — | — | — | corroborated | |
| OEM-T121-63 | Post-cat lambda heater (Z29) | low_side_out | KV12-A-11 | Lambda 2 Heater - | low_side_out | corroborated | |
| OEM-T121-64 | EVAP canister valve (N80) | low_side_out | KV12-B-12 | Auxiliary Output 3 | low_side_out | corroborated | |
| OEM-T121-65 | Fuel pump relay control | low_side_out | KV12-D-9 | EFI Relay Output (Low Side 200mA) | low_side_out | corroborated | |
| OEM-T121-66 | Secondary-air pump relay (J299) | low_side_out | KV12-B-14 | Auxiliary Output 5 | low_side_out | corroborated | |
| OEM-T121-68 | Post-cat lambda signal (G130) | lambda_nb_in | KV12-C-9 | Analog Input Channel 8 | analog_in | corroborated | |
| OEM-T121-69 | Post-cat lambda signal (G130) | lambda_nb_in | KV12-C-10 | Analog Input Channel 9 | analog_in | corroborated | |
| OEM-T121-70 | Wideband lambda Nernst signal (G39) | wb_vs | KV12-A-18 | Lambda 1 Nernst Cell (Vs) | wb_vs | corroborated | |
| OEM-T121-71 | Wideband lambda Nernst signal (G39) | wb_vs | KV12-A-21 | Lambda 2 Nernst Cell (Vs) | wb_vs | corroborated | |
| OEM-T121-72 | Accelerator pedal position 1 5V supply (G79) | vref | KV12-D-21 | Sensor Supply Vref1: 5.0V | vref | corroborated | |
| OEM-T121-73 | Accelerator pedal position 2 5V supply (G185) | vref | KV12-D-22 | Sensor Supply Vref2: 5.0V | vref | corroborated | |
| OEM-T121-82 | Crank position sensor (G28) | trigger_in | KV12-D-4 | Crank Index Sensor + | trigger_in | corroborated | |
| OEM-T121-83 | Throttle position sensor 5V supply (G187/G188) | vref | KV12-D-21 | Sensor Supply Vref1: 5.0V | vref | corroborated | |
| OEM-T121-84 | Throttle position sensor 1 (G187) | analog_in | KV12-C-5 | Analog Input Channel 4 | analog_in | corroborated | |
| OEM-T121-85 | Intake air temperature (G42) | temp_in | KV12-C-11 | Analog Input Channel 10 | analog_in | corroborated | |
| OEM-T121-86 | Camshaft position sensor (G40) | trigger_in | KV12-D-6 | Sync Sensor + | trigger_in | corroborated | |
| OEM-T121-88 | Injector 4 (N33) | injector_out | KV12-B-4 | Injection Channel 4 | injector_out | corroborated | |
| OEM-T121-89 | Injector 2 (N31) | injector_out | KV12-B-2 | Injection Channel 2 | injector_out | corroborated | |
| OEM-T121-9 | Secondary-air injection valve (N112) | low_side_out | KV12-B-13 | Auxiliary Output 4 | low_side_out | corroborated | |
| OEM-T121-90 | Crank position sensor ground (G28) | 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-T121-91 | Throttle position sensor ground (G187/G188) | 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-T121-92 | Throttle position sensor 2 (G188) | analog_in | KV12-C-7 | Analog Input Channel 6 | analog_in | corroborated | |
| OEM-T121-93 | Engine coolant temperature (G62) | temp_in | KV12-C-8 | Analog Input Channel 7 | analog_in | corroborated | |
| OEM-T121-94 | Ignition coil 4 (N163) | ignition_out | KV12-B-29 | Ignition Channel 4 | ignition_out | corroborated | |
| OEM-T121-95 | Ignition coil 2 (N128) | ignition_out | KV12-B-27 | Ignition Channel 2 | ignition_out | corroborated | |
| OEM-T121-96 | Injector 1 (N30) | injector_out | KV12-B-1 | Injection Channel 1 | injector_out | corroborated | |
| OEM-T121-97 | Injector 3 (N32) | injector_out | KV12-B-3 | Injection Channel 3 | injector_out | corroborated | |
| OEM-T121-98 | Cam + boost sensor 5V supply (G40/G31) | vref | KV12-D-22 | Sensor Supply Vref2: 5.0V | vref | corroborated | |
| OEM-T121-99 | Knock sensor 5V supply (G61/G66) | vref | KV12-D-21 | Sensor Supply Vref1: 5.0V | vref | corroborated |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-T121-121 | SP-14V-1 | 0.85 | no route | ECM + coil power (J271 relay feed) | — | |
| W2 | OEM-T121-21 | SP-14V-1 | 0.85 | no route | ECM power (J271 relay feed) | — | |
| W3 | SP-14V-1 | KV12-D-1 | 0.85 | no route | ECU 14V Supply | — | |
| W4 | SP-14V-1 | KV12-D-2 | 0.85 | no route | Auxiliary Output 13-16 14V Supply | — | |
| W5 | SP-14V-1 | KV12-D-20 | 0.85 | no route | Auxiliary Output 9-12 14V Supply | — | |
| W6 | OEM-T121-1 | SP-GND-1 | 0.85 | no route | ECU ground | — | |
| W7 | OEM-T121-2 | SP-GND-1 | 0.85 | no route | ECU ground | — | |
| W8 | SP-GND-1 | KV12-A-19 | 0.85 | no route | ECU Ground | — | |
| W9 | SP-GND-1 | KV12-B-34 | 0.85 | no route | ECU Ground | — | |
| W10 | SP-GND-1 | KV12-B-9 | 0.85 | no route | ECU Ground | — | |
| W11 | SP-GND-1 | KV12-C-1 | 0.85 | no route | ECU Ground | — | |
| W12 | SP-GND-1 | KV12-C-26 | 0.85 | no route | ECU Ground | — | |
| W13 | OEM-T121-108 | SP-0V-1 | 0.5 | no route | Sensor ground | — | |
| W14 | OEM-T121-29 | SP-0V-1 | 0.5 | no route | MAF sensor ground (G70) | — | |
| W15 | OEM-T121-34 | SP-0V-1 | 0.5 | no route | Accelerator pedal position 1 ground (G79) | — | |
| W16 | OEM-T121-36 | SP-0V-1 | 0.5 | no route | Accelerator pedal position 2 ground (G185) | — | |
| W17 | OEM-T121-90 | SP-0V-1 | 0.5 | no route | Crank position sensor ground (G28) | — | |
| W18 | OEM-T121-91 | SP-0V-1 | 0.5 | no route | Throttle position sensor ground (G187/G188) | — | |
| 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-T121-72 | SP-5V1-1 | 0.5 | no route | Accelerator pedal position 1 5V supply (G79) | — | |
| W22 | OEM-T121-83 | SP-5V1-1 | 0.5 | no route | Throttle position sensor 5V supply (G187/G188) | — | |
| W23 | OEM-T121-99 | SP-5V1-1 | 0.5 | no route | Knock sensor 5V supply (G61/G66) | — | |
| W24 | SP-5V1-1 | KV12-D-21 | 0.5 | no route | Sensor Supply Vref1: 5.0V | — | |
| W25 | OEM-T121-73 | SP-5V2-1 | 0.5 | no route | Accelerator pedal position 2 5V supply (G185) | — | |
| W26 | OEM-T121-98 | SP-5V2-1 | 0.5 | no route | Cam + boost sensor 5V supply (G40/G31) | — | |
| W27 | SP-5V2-1 | KV12-D-22 | 0.5 | no route | Sensor Supply Vref2: 5.0V | — | |
| W28 | OEM-T121-82 | KV12-D-4 | 0.5 | no route | Crank position sensor (G28) | — | |
| W29 | SP-0V-1 | KV12-D-5 | 0.5 | no route | Crank Index Sensor - | — | |
| W30 | OEM-T121-86 | KV12-D-6 | 0.5 | no route | Camshaft position sensor (G40) | — | |
| W31 | SP-0V-1 | KV12-D-7 | 0.5 | no route | Sync Sensor - | — | |
| W32 | OEM-T121-106 | KV12-D-11 | 0.5 | no route | Knock sensor 1 (G61) | — | |
| W33 | OEM-T121-107 | KV12-D-17 | 0.5 | no route | Knock sensor 2 (G66) | — | |
| W34 | OEM-T121-102 | KV12-B-26 | 0.5 | no route | Ignition coil 1 (N127) | — | |
| W35 | OEM-T121-95 | KV12-B-27 | 0.5 | no route | Ignition coil 2 (N128) | — | |
| W36 | OEM-T121-103 | KV12-B-28 | 0.5 | no route | Ignition coil 3 (N158) | — | |
| W37 | OEM-T121-94 | KV12-B-29 | 0.5 | no route | Ignition coil 4 (N163) | — | |
| W38 | OEM-T121-96 | KV12-B-1 | 0.5 | no route | Injector 1 (N30) | — | |
| W39 | OEM-T121-89 | KV12-B-2 | 0.5 | no route | Injector 2 (N31) | — | |
| W40 | OEM-T121-97 | KV12-B-3 | 0.5 | no route | Injector 3 (N32) | — | |
| W41 | OEM-T121-88 | KV12-B-4 | 0.5 | no route | Injector 4 (N33) | — | |
| W42 | OEM-T121-118 | KV12-B-19 | 0.5 | no route | Throttle motor G186 (−) | — | |
| W43 | OEM-T121-117 | KV12-B-18 | 0.5 | no route | Throttle motor G186 (+) | — | |
| W44 | OEM-T121-3 | KV12-D-15 | 0.5 | no route | Ignition switch +12V (term 15) | — | |
| W45 | OEM-T121-53 | KV12-C-2 | 0.5 | no route | MAF sensor signal (G70) | — | |
| W46 | OEM-T121-101 | KV12-C-3 | 0.5 | no route | Boost pressure sensor (G31) | — | |
| W47 | OEM-T121-33 | KV12-C-4 | 0.5 | no route | Accelerator pedal position 1 (G79) | — | |
| W48 | OEM-T121-84 | KV12-C-5 | 0.5 | no route | Throttle position sensor 1 (G187) | — | |
| W49 | OEM-T121-35 | KV12-C-6 | 0.5 | no route | Accelerator pedal position 2 (G185) | — | |
| W50 | OEM-T121-92 | KV12-C-7 | 0.5 | no route | Throttle position sensor 2 (G188) | — | |
| W51 | OEM-T121-93 | KV12-C-8 | 0.5 | no route | Engine coolant temperature (G62) | — | |
| W52 | OEM-T121-65 | KV12-D-9 | 0.5 | no route | Fuel pump relay control | — | |
| W53 | OEM-T121-66 | KV12-B-14 | 0.5 | no route | Secondary-air pump relay (J299) | — | |
| W54 | OEM-T121-5 | KV12-A-10 | 0.5 | no route | Wideband lambda heater (Z19) | — | |
| W55 | OEM-T121-63 | KV12-A-11 | 0.5 | no route | Post-cat lambda heater (Z29) | — | |
| W56 | OEM-T121-104 | KV12-B-15 | 0.5 | no route | Boost control solenoid (N75) | — | |
| W57 | OEM-T121-105 | KV12-B-16 | 0.5 | no route | Diverter valve (N249) | — | |
| W58 | OEM-T121-115 | KV12-B-17 | 0.5 | no route | VVT camshaft adjustment valve (N205) | — | |
| W59 | OEM-T121-47 | KV12-B-10 | 0.5 | no route | Check engine light (MIL) | — | |
| W60 | OEM-T121-48 | KV12-B-11 | 0.5 | no route | EPC warning light | — | |
| W61 | OEM-T121-64 | KV12-B-12 | 0.5 | no route | EVAP canister valve (N80) | — | |
| W62 | OEM-T121-9 | KV12-B-13 | 0.5 | no route | Secondary-air injection valve (N112) | — | |
| W63 | OEM-T121-51 | KV12-A-25 | 0.5 | no route | Wideband lambda pump (G39) | — | |
| W64 | OEM-T121-52 | KV12-A-22 | 0.5 | no route | Wideband lambda pump (G39) | — | |
| W65 | OEM-T121-70 | KV12-A-18 | 0.5 | no route | Wideband lambda Nernst signal (G39) | — | |
| W66 | OEM-T121-71 | KV12-A-21 | 0.5 | no route | Wideband lambda Nernst signal (G39) | — | |
| W67 | OEM-T121-68 | KV12-C-9 | 0.5 | no route | Post-cat lambda signal (G130) | — | |
| W68 | OEM-T121-69 | KV12-C-10 | 0.5 | no route | Post-cat lambda signal (G130) | — | |
| W69 | OEM-T121-85 | KV12-C-11 | 0.5 | no route | Intake air temperature (G42) | — | |
| W70 | OEM-T121-54 | KV12-C-27 | 0.5 | no route | Road speed signal (VSS) | — | |
| W71 | OEM-T121-60 | KV12-D-8 | 0.5 | no route | CAN bus high | — | |
| W72 | OEM-T121-58 | KV12-D-14 | 0.5 | no route | CAN bus low | — |
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) | 57.000 | ea |
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| No configured channels. | |||||||
Findings
Open (12)
| 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. |
| warn | DBW_MOTOR_CURRENT | KV12-B-18 | Cannot confirm KV12 can drive the throttle motor: KV12-B-18 "Auxiliary Output 9" is rated 5 A peak, but the motor stall current at OEM-T121-117 is unknown. Add the motor's peak current from a source, or measure the motor resistance: peak ≈ 14 V ÷ R (Hondata measured 4.9 A for a Civic Si body, 10.4 A for a ZDX body; holding current is about 1 A). |
| warn | DBW_MOTOR_CURRENT | KV12-B-19 | Cannot confirm KV12 can drive the throttle motor: KV12-B-19 "Auxiliary Output 10" is rated 5 A peak, but the motor stall current at OEM-T121-118 is unknown. Add the motor's peak current from a source, or measure the motor resistance: peak ≈ 14 V ÷ R (Hondata measured 4.9 A for a Civic Si body, 10.4 A for a ZDX body; holding current is about 1 A). |
| warn | DBW_MOTOR_ISOLATION | KV12-D-20 | KV12-D-20 "Auxiliary Output 9-12 14V Supply" is fed from the same net as the ECU main supply (KV12-D-1). Link's S2000 DBW wiring feeds the throttle-motor supply through a separate isolation relay switched by the ECU, so motor power can be cut on a throttle fault. Add one, or confirm KV12 cuts the H-bridge internally. |
| warn | DBW_SHARED_5V | KV12-D-21 + OEM-T121-72 + OEM-T121-83 + OEM-T121-99 + SP-5V1-1 | These 5 V supplies are separate in the stock car (OEM-T121-72 [pedal1], OEM-T121-83 [tps], OEM-T121-99 [knock]) and here share one ECU 5 V (KV12-D-21). On a drive-by-wire car the OEM splits them so one short or fault can't corrupt both throttle/pedal tracks at once. KV12 has 2 5 V sensor supply pin(s). All are in use, so decide: accept the shared supply (and rely on the ECU's DBW fault checks), or add a separate regulated 5 V for the sub tracks. |
| warn | DBW_SHARED_5V | KV12-D-22 + OEM-T121-73 + OEM-T121-98 + SP-5V2-1 | These 5 V supplies are separate in the stock car (OEM-T121-73 [pedal2], OEM-T121-98 [cam_boost]) and here share one ECU 5 V (KV12-D-22). On a drive-by-wire car the OEM splits them so one short or fault can't corrupt both throttle/pedal tracks at once. KV12 has 2 5 V sensor supply pin(s). All are in use, so decide: accept the shared supply (and rely on the ECU's DBW fault checks), or add a separate regulated 5 V for the sub tracks. |
| warn | SUPPLY_GROUP | KV12-D-21 + OEM-T121-72 + OEM-T121-83 + OEM-T121-99 + SP-5V1-1 | Supplies meant to stay independent share one net: OEM-T121-72 [pedal1], OEM-T121-83 [tps], OEM-T121-99 [knock]. The new ECU has no free 5 V reference, so they share one: normal on a standalone, but a short on any of these sensors drops them all. |
| warn | SUPPLY_GROUP | KV12-D-22 + OEM-T121-73 + OEM-T121-98 + SP-5V2-1 | Supplies meant to stay independent share one net: OEM-T121-73 [pedal2], OEM-T121-98 [cam_boost]. The new ECU has no free 5 V reference, so they share one: normal on a standalone, but a short on any of these sensors drops them all. |
| info | NET_FAMILY | KV12-C-17 ↔ KV12-D-7 | KV12-C-17 "Analog Sensor 0V Reference" [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-T121-85 ↔ KV12-C-11 | OEM-T121-85 "Intake air temperature (G42)" [temp_in] is wired to KV12-C-11 "Analog Input Channel 10" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | NET_FAMILY | OEM-T121-93 ↔ KV12-C-8 | OEM-T121-93 "Engine coolant temperature (G62)" [temp_in] is wired to KV12-C-8 "Analog Input Channel 7" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | UNMAPPED | OEM | 3 optional OEM pins are not mapped: OEM-T121-27 MAF sensor supply (G70); OEM-T121-37 Engine speed signal (tacho to cluster); OEM-T121-43 K-line diagnostics (OBD pin 7) |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-T121-62 | 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 VW EA113 not found in the ECU's docs (No VW 1.8T 20v (EA113) decoder.) - This car has VW/Audi Immobilizer (delete/bypass for standalone) immobilizer; needs a delete/bypass Auto-mapped by auto_map() from the library pin data on 2026-10-11. Review every wire against both manuals before building. Not wired: - OEM-T121 62: Battery constant +12V (term 30): 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 - OEM-T121 37: Engine speed signal (tacho to cluster): no free tacho/frequency_out/low_side/ls_hs on Emtron KV12 - OEM-T121 43: K-line diagnostics (OBD pin 7): no free k_line on Emtron KV12 - OEM-T121 27: MAF sensor supply (G70): no rule for class sensor_supply_in; wire by hand
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 |
| 3 | community_copy | NefMoto: ME7.5 ECU bench-flashing power/ground pins | http://nefmoto.com/wiki/index.php?title=ECU_Bench_Flashing | — | — | — |
| 3 | community_copy | vwressources: Bosch Motronic ME7.5 (AMK/ARY/AUQ/ARX/AUM) T121 pinout | https://www.vwressources.planethoster.world/me75_pinout.html | — | — | — |