VW Golf Mk4 1.8T 20v (AUM, Bosch ME7.5) DBW → DTAFast T12 (auto)
VW Golf Mk4 1.8T 20v (AUM, Bosch ME7.5) DBW — DTAFast — T12
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 2026-10-12
Before you start
Not confident with automotive wiring? Have a professional harness builder or tuner do it, or check your work before first power-up. A wiring mistake can damage the ECU, the engine or the car, or start a fire.
| Status | draft · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | 2: read the Findings page before cutting any wire |
| Size of the job | 66 wires · 9 connectors · 2 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 | T12-C1-31 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-T121-62 | T12-C3-26 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-T121-1 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-T121-2 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | SP-GND-1 | T12-C1-13 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | T12-C1-14 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | OEM-T121-108 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-T121-29 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-T121-34 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-T121-36 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-T121-90 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-T121-91 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | SP-0V-1 | T12-C2-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | SP-0V-1 | T12-C2-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-T121-72 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-T121-98 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | SP-5V1-1 | T12-C2-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-T121-73 | SP-5V2-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-T121-83 | SP-5V2-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-T121-99 | SP-5V2-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | SP-5V2-1 | T12-C2-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-T121-82 | T12-C2-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-T121-86 | T12-C2-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-T121-106 | T12-C3-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-T121-107 | T12-C3-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-T121-102 | T12-C1-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-T121-95 | T12-C1-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-T121-103 | T12-C1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-T121-94 | T12-C1-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-T121-96 | T12-C1-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-T121-89 | T12-C1-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-T121-97 | T12-C1-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-T121-88 | T12-C1-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-T121-118 | T12-C1-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-T121-117 | T12-C1-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-T121-53 | T12-C2-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-T121-101 | T12-C2-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-T121-33 | T12-C2-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-T121-84 | T12-C2-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-T121-35 | T12-C2-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-T121-92 | T12-C2-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-T121-93 | T12-C2-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-T121-65 | T12-C1-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-T121-66 | T12-C1-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-T121-5 | T12-C3-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | OEM-T121-63 | T12-C3-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W49 | OEM-T121-104 | T12-C1-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W50 | OEM-T121-105 | T12-C3-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W51 | OEM-T121-115 | T12-C3-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W52 | OEM-T121-47 | T12-C3-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W53 | OEM-T121-48 | T12-C3-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W54 | OEM-T121-64 | T12-C3-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W55 | OEM-T121-9 | T12-C3-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W56 | OEM-T121-37 | T12-C3-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W57 | OEM-T121-51 | T12-C3-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W58 | OEM-T121-52 | T12-C3-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W59 | OEM-T121-70 | T12-C3-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W60 | OEM-T121-71 | T12-C3-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W61 | OEM-T121-68 | T12-C3-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W62 | OEM-T121-69 | T12-C3-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W63 | OEM-T121-85 | T12-C2-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W64 | OEM-T121-54 | T12-C2-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W65 | OEM-T121-60 | T12-C3-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W66 | OEM-T121-58 | T12-C3-34 | 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 | T12-C1-13 | T12-C1-31 | open (OL) | power ground must not touch +12 V supply | |
| 2 | T12-C1-13 | T12-C2-24 | open (OL) | power ground must not touch 5 V sensor reference | |
| 3 | T12-C1-13 | T12-C2-9 | open (OL) | power ground must not touch 5 V sensor reference | |
| 4 | T12-C1-13 | T12-C3-26 | open (OL) | power ground must not touch +12 V supply | |
| 5 | T12-C1-31 | T12-C2-24 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 6 | T12-C1-31 | T12-C2-9 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 7 | T12-C2-21 | T12-C1-31 | open (OL) | sensor ground must not touch +12 V supply | |
| 8 | T12-C2-21 | T12-C2-24 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 9 | T12-C2-21 | T12-C2-9 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 10 | T12-C2-21 | T12-C3-26 | open (OL) | sensor ground must not touch +12 V supply | |
| 11 | T12-C3-26 | T12-C2-24 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 12 | T12-C3-26 | T12-C2-9 | 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
OEM-T121
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | ECU ground | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 101 | Boost pressure sensor (G31) | — | W39 | — | 0.5 | T12-C2-1 | — | — | — |
| 102 | Ignition coil 1 (N127) | — | W28 | — | 0.5 | T12-C1-10 | — | — | — |
| 103 | Ignition coil 3 (N158) | — | W30 | — | 0.5 | T12-C1-1 | — | — | — |
| 104 | Boost control solenoid (N75) | — | W49 | — | 0.5 | T12-C1-3 | — | — | — |
| 105 | Diverter valve (N249) | — | W50 | — | 0.5 | T12-C3-22 | — | — | — |
| 106 | Knock sensor 1 (G61) | — | W26 | — | 0.5 | T12-C3-31 | — | — | — |
| 107 | Knock sensor 2 (G66) | — | W27 | — | 0.5 | T12-C3-32 | — | — | — |
| 108 | Sensor ground | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| 115 | VVT camshaft adjustment valve (N205) | — | W51 | — | 0.5 | T12-C3-23 | — | — | — |
| 117 | Throttle motor G186 (+) | — | W37 | — | 0.5 | T12-C1-6 | — | — | — |
| 118 | Throttle motor G186 (−) | — | W36 | — | 0.5 | T12-C1-7 | — | — | — |
| 121 | ECM + coil power (J271 relay feed) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 2 | ECU ground | — | W6 | — | 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) | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| 3 | Ignition switch +12V (term 15) | — | — | — | — | — | — | — | — |
| 33 | Accelerator pedal position 1 (G79) | — | W40 | — | 0.5 | T12-C2-5 | — | — | — |
| 34 | Accelerator pedal position 1 ground (G79) | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| 35 | Accelerator pedal position 2 (G185) | — | W42 | — | 0.5 | T12-C2-18 | — | — | — |
| 36 | Accelerator pedal position 2 ground (G185) | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 37 | Engine speed signal (tacho to cluster) | — | W56 | — | 0.5 | T12-C3-28 | — | — | — |
| 43 | K-line diagnostics (OBD pin 7) | — | — | — | — | — | — | — | — |
| 47 | Check engine light (MIL) | — | W52 | — | 0.5 | T12-C3-24 | — | — | — |
| 48 | EPC warning light | — | W53 | — | 0.5 | T12-C3-25 | — | — | — |
| 5 | Wideband lambda heater (Z19) | — | W47 | — | 0.5 | T12-C3-9 | — | — | — |
| 51 | Wideband lambda pump (G39) | — | W57 | — | 0.5 | T12-C3-7 | — | — | — |
| 52 | Wideband lambda pump (G39) | — | W58 | — | 0.5 | T12-C3-1 | — | — | — |
| 53 | MAF sensor signal (G70) | — | W38 | — | 0.5 | T12-C2-10 | — | — | — |
| 54 | Road speed signal (VSS) | — | W64 | — | 0.5 | T12-C2-2 | — | — | — |
| 58 | CAN bus low | — | W66 | — | 0.5 | T12-C3-34 | — | — | — |
| 60 | CAN bus high | — | W65 | — | 0.5 | T12-C3-33 | — | — | — |
| 62 | Battery constant +12V (term 30) | — | W4 | — | 0.85 | T12-C3-26 | — | — | — |
| 63 | Post-cat lambda heater (Z29) | — | W48 | — | 0.5 | T12-C3-3 | — | — | — |
| 64 | EVAP canister valve (N80) | — | W54 | — | 0.5 | T12-C3-10 | — | — | — |
| 65 | Fuel pump relay control | — | W45 | — | 0.5 | T12-C1-5 | — | — | — |
| 66 | Secondary-air pump relay (J299) | — | W46 | — | 0.5 | T12-C1-4 | — | — | — |
| 68 | Post-cat lambda signal (G130) | — | W61 | — | 0.5 | T12-C3-17 | — | — | — |
| 69 | Post-cat lambda signal (G130) | — | W62 | — | 0.5 | T12-C3-18 | — | — | — |
| 70 | Wideband lambda Nernst signal (G39) | — | W59 | — | 0.5 | T12-C3-12 | — | — | — |
| 71 | Wideband lambda Nernst signal (G39) | — | W60 | — | 0.5 | T12-C3-6 | — | — | — |
| 72 | Accelerator pedal position 1 5V supply (G79) | — | W17 | — | 0.5 | SP-5V1-1 | — | — | — |
| 73 | Accelerator pedal position 2 5V supply (G185) | — | W20 | — | 0.5 | SP-5V2-1 | — | — | — |
| 82 | Crank position sensor (G28) | — | W24 | — | 0.5 | T12-C2-12 | — | — | — |
| 83 | Throttle position sensor 5V supply (G187/G188) | — | W21 | — | 0.5 | SP-5V2-1 | — | — | — |
| 84 | Throttle position sensor 1 (G187) | — | W41 | — | 0.5 | T12-C2-6 | — | — | — |
| 85 | Intake air temperature (G42) | — | W63 | — | 0.5 | T12-C2-25 | — | — | — |
| 86 | Camshaft position sensor (G40) | — | W25 | — | 0.5 | T12-C2-22 | — | — | — |
| 88 | Injector 4 (N33) | — | W35 | — | 0.5 | T12-C1-25 | — | — | — |
| 89 | Injector 2 (N31) | — | W33 | — | 0.5 | T12-C1-17 | — | — | — |
| 9 | Secondary-air injection valve (N112) | — | W55 | — | 0.5 | T12-C3-4 | — | — | — |
| 90 | Crank position sensor ground (G28) | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 91 | Throttle position sensor ground (G187/G188) | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 92 | Throttle position sensor 2 (G188) | — | W43 | — | 0.5 | T12-C2-19 | — | — | — |
| 93 | Engine coolant temperature (G62) | — | W44 | — | 0.5 | T12-C2-7 | — | — | — |
| 94 | Ignition coil 4 (N163) | — | W31 | — | 0.5 | T12-C1-26 | — | — | — |
| 95 | Ignition coil 2 (N128) | — | W29 | — | 0.5 | T12-C1-18 | — | — | — |
| 96 | Injector 1 (N30) | — | W32 | — | 0.5 | T12-C1-9 | — | — | — |
| 97 | Injector 3 (N32) | — | W34 | — | 0.5 | T12-C1-34 | — | — | — |
| 98 | Cam + boost sensor 5V supply (G40/G31) | — | W18 | — | 0.5 | SP-5V1-1 | — | — | — |
| 99 | Knock sensor 5V supply (G61/G66) | — | W22 | — | 0.5 | SP-5V2-1 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W10 | — | 0.5 | OEM-T121-29 | — | — | — |
| 1 | — | — | W9 | — | 0.5 | OEM-T121-108 | — | — | — |
| 1 | — | — | W11 | — | 0.5 | OEM-T121-34 | — | — | — |
| 1 | — | — | W12 | — | 0.5 | OEM-T121-36 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | OEM-T121-90 | — | — | — |
| 1 | — | — | W14 | — | 0.5 | OEM-T121-91 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | T12-C2-21 | — | — | — |
| 1 | — | — | W16 | — | 0.5 | T12-C2-33 | — | — | — |
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 | T12-C1-31 | — | — | — |
SP-5V1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W17 | — | 0.5 | OEM-T121-72 | — | — | — |
| 1 | — | — | W18 | — | 0.5 | OEM-T121-98 | — | — | — |
| 1 | — | — | W19 | — | 0.5 | T12-C2-24 | — | — | — |
SP-5V2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W20 | — | 0.5 | OEM-T121-73 | — | — | — |
| 1 | — | — | W21 | — | 0.5 | OEM-T121-83 | — | — | — |
| 1 | — | — | W22 | — | 0.5 | OEM-T121-99 | — | — | — |
| 1 | — | — | W23 | — | 0.5 | T12-C2-9 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W5 | — | 0.85 | OEM-T121-1 | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-T121-2 | — | — | — |
| 1 | — | — | W7 | — | 0.85 | T12-C1-13 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | T12-C1-14 | — | — | — |
T12-C1
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Coil 3 | — | W30 | — | 0.5 | OEM-T121-103 | — | — | — |
| 2 | Coil 11 | — | — | — | — | — | — | — | — |
| 3 | PWM 3 | — | W49 | — | 0.5 | OEM-T121-104 | — | — | — |
| 4 | PWM 2 | — | W46 | — | 0.5 | OEM-T121-66 | — | — | — |
| 5 | PWM 1 | — | W45 | — | 0.5 | OEM-T121-65 | — | — | — |
| 6 | Motor 1 + | — | W37 | — | 0.5 | OEM-T121-117 | — | — | — |
| 7 | Motor 1 - | — | W36 | — | 0.5 | OEM-T121-118 | — | — | — |
| 8 | Injector 11 | — | — | — | — | — | — | — | — |
| 9 | Injector 1 | — | W32 | — | 0.5 | OEM-T121-96 | — | — | — |
| 10 | Coil 1 | — | W28 | — | 0.5 | OEM-T121-102 | — | — | — |
| 11 | Coil 5 | — | — | — | — | — | — | — | — |
| 12 | Coil 7 | — | — | — | — | — | — | — | — |
| 13 | Power Ground 1 | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 14 | Power Ground 2 | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 15 | Injector 6 | — | — | — | — | — | — | — | — |
| 16 | Injector 5 | — | — | — | — | — | — | — | — |
| 17 | Injector 2 | — | W33 | — | 0.5 | OEM-T121-89 | — | — | — |
| 18 | Coil 2 | — | W29 | — | 0.5 | OEM-T121-95 | — | — | — |
| 19 | Coil 8 | — | — | — | — | — | — | — | — |
| 20 | Coil 9 | — | — | — | — | — | — | — | — |
| 21 | Injector 9 | — | — | — | — | — | — | — | — |
| 22 | Injector 10 | — | — | — | — | — | — | — | — |
| 23 | Injector 8 | — | — | — | — | — | — | — | — |
| 24 | Injector 7 | — | — | — | — | — | — | — | — |
| 25 | Injector 4 | — | W35 | — | 0.5 | OEM-T121-88 | — | — | — |
| 26 | Coil 4 | — | W31 | — | 0.5 | OEM-T121-94 | — | — | — |
| 27 | Coil 6 | — | — | — | — | — | — | — | — |
| 28 | Coil 10 | — | — | — | — | — | — | — | — |
| 29 | Motor 2 + | — | — | — | — | — | — | — | — |
| 30 | Motor 2 - | — | — | — | — | — | — | — | — |
| 31 | Ignition 12v In | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 32 | Injector 12 | — | — | — | — | — | — | — | — |
| 33 | Coil 12 | — | — | — | — | — | — | — | — |
| 34 | Injector 3 | — | W34 | — | 0.5 | OEM-T121-97 | — | — | — |
T12-C2
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Analogue 2 | — | W39 | — | 0.5 | OEM-T121-101 | — | — | — |
| 2 | Wheel 1 | — | W64 | — | 0.5 | OEM-T121-54 | — | — | — |
| 3 | Analogue 10 | — | — | — | — | — | — | — | — |
| 4 | Digital 1 | — | — | — | — | — | — | — | — |
| 5 | Analogue 3 | — | W40 | — | 0.5 | OEM-T121-33 | — | — | — |
| 6 | Analogue 4 | — | W41 | — | 0.5 | OEM-T121-84 | — | — | — |
| 7 | Thermistor 1 | — | W44 | — | 0.5 | OEM-T121-93 | — | — | — |
| 8 | Digital 2 | — | — | — | — | — | — | — | — |
| 9 | 5v Output | — | W23 | — | 0.5 | SP-5V2-1 | — | — | — |
| 10 | Analogue 1 | — | W38 | — | 0.5 | OEM-T121-53 | — | — | — |
| 11 | Digital 3 | — | — | — | — | — | — | — | — |
| 12 | Crank | — | W24 | — | 0.5 | OEM-T121-82 | — | — | — |
| 13 | Analogue 12 | — | — | — | — | — | — | — | — |
| 14 | Digital 4 | — | — | — | — | — | — | — | — |
| 15 | Digital 5 | — | — | — | — | — | — | — | — |
| 16 | Analogue 11 | — | — | — | — | — | — | — | — |
| 17 | Thermistor 3 | — | — | — | — | — | — | — | — |
| 18 | Analogue 5 | — | W42 | — | 0.5 | OEM-T121-35 | — | — | — |
| 19 | Analogue 6 | — | W43 | — | 0.5 | OEM-T121-92 | — | — | — |
| 20 | Wheel 2 | — | — | — | — | — | — | — | — |
| 21 | Sensor Ground | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 22 | Cam 1 | — | W25 | — | 0.5 | OEM-T121-86 | — | — | — |
| 23 | Cam 3 | — | — | — | — | — | — | — | — |
| 24 | 5v Output | — | W19 | — | 0.5 | SP-5V1-1 | — | — | — |
| 25 | Thermistor 2 | — | W63 | — | 0.5 | OEM-T121-85 | — | — | — |
| 26 | CAN High | — | — | — | — | — | — | — | — |
| 27 | Digital 6 | — | — | — | — | — | — | — | — |
| 28 | CAN Low | — | — | — | — | — | — | — | — |
| 29 | Cam 2 | — | — | — | — | — | — | — | — |
| 30 | Cam 4 | — | — | — | — | — | — | — | — |
| 31 | Wheel 3 | — | — | — | — | — | — | — | — |
| 32 | Wheel 4 | — | — | — | — | — | — | — | — |
| 33 | Sensor Ground | — | W16 | — | 0.5 | SP-0V-1 | — | — | — |
| 34 | Analogue 9 | — | — | — | — | — | — | — | — |
T12-C3
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Lambda 2 Pump Current | — | W58 | — | 0.5 | OEM-T121-52 | — | — | — |
| 2 | Lambda 2 VGND | — | — | — | — | — | — | — | — |
| 3 | Lambda 2 Heater Negative | — | W48 | — | 0.5 | OEM-T121-63 | — | — | — |
| 4 | PWM 9 | — | W55 | — | 0.5 | OEM-T121-9 | — | — | — |
| 5 | Lambda 2 Trim Resistor | — | — | — | — | — | — | — | — |
| 6 | Lambda 2 Nernst Voltage | — | W60 | — | 0.5 | OEM-T121-71 | — | — | — |
| 7 | Lambda 1 Pump Current | — | W57 | — | 0.5 | OEM-T121-51 | — | — | — |
| 8 | Lambda 1 VGND | — | — | — | — | — | — | — | — |
| 9 | Lambda 1 Heater Negative | — | W47 | — | 0.5 | OEM-T121-5 | — | — | — |
| 10 | PWM 8 | — | W54 | — | 0.5 | OEM-T121-64 | — | — | — |
| 11 | Lambda 1 Trim Resistor | — | — | — | — | — | — | — | — |
| 12 | Lambda 1 Nernst Voltage | — | W59 | — | 0.5 | OEM-T121-70 | — | — | — |
| 13 | Analogue 13 | — | — | — | — | — | — | — | — |
| 14 | Analogue 14 | — | — | — | — | — | — | — | — |
| 15 | Analogue 15 | — | — | — | — | — | — | — | — |
| 16 | Analogue 16 | — | — | — | — | — | — | — | — |
| 17 | Analogue 7 | — | W61 | — | 0.5 | OEM-T121-68 | — | — | — |
| 18 | Analogue 8 | — | W62 | — | 0.5 | OEM-T121-69 | — | — | — |
| 19 | Digital 7 | — | — | — | — | — | — | — | — |
| 20 | Digital 8 | — | — | — | — | — | — | — | — |
| 21 | Digital 9 | — | — | — | — | — | — | — | — |
| 22 | PWM 4 | — | W50 | — | 0.5 | OEM-T121-105 | — | — | — |
| 23 | PWM 5 | — | W51 | — | 0.5 | OEM-T121-115 | — | — | — |
| 24 | PWM 6 | — | W52 | — | 0.5 | OEM-T121-47 | — | — | — |
| 25 | PWM 7 | — | W53 | — | 0.5 | OEM-T121-48 | — | — | — |
| 26 | Permanent 12v | — | W4 | — | 0.85 | OEM-T121-62 | — | — | — |
| 27 | Permanent 12v | — | — | — | — | — | — | — | — |
| 28 | PWM 10 | — | W56 | — | 0.5 | OEM-T121-37 | — | — | — |
| 29 | PWM 11 | — | — | — | — | — | — | — | — |
| 30 | PWM 12 | — | — | — | — | — | — | — | — |
| 31 | Knock 1 | — | W26 | — | 0.5 | OEM-T121-106 | — | — | — |
| 32 | Knock 2 | — | W27 | — | 0.5 | OEM-T121-107 | — | — | — |
| 33 | CAN 2 High | — | W65 | — | 0.5 | OEM-T121-60 | — | — | — |
| 34 | CAN 2 Low | — | W66 | — | 0.5 | OEM-T121-58 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-T121-1 | ECU ground | ground | T12-C1-13 + T12-C1-14 | Power Ground 1 + Power Ground 2 | ground | corroborated | |
| OEM-T121-101 | Boost pressure sensor (G31) | analog_in | T12-C2-1 | Analogue 2 | analog_in | corroborated | |
| OEM-T121-102 | Ignition coil 1 (N127) | ignition_out | T12-C1-10 | Coil 1 | ignition_out | corroborated | |
| OEM-T121-103 | Ignition coil 3 (N158) | ignition_out | T12-C1-1 | Coil 3 | ignition_out | corroborated | |
| OEM-T121-104 | Boost control solenoid (N75) | low_side_out | T12-C1-3 | PWM 3 | low_side_out | corroborated | |
| OEM-T121-105 | Diverter valve (N249) | low_side_out | T12-C3-22 | PWM 4 | low_side_out | corroborated | |
| OEM-T121-106 | Knock sensor 1 (G61) | knock_in | T12-C3-31 | Knock 1 | knock_in | corroborated | |
| OEM-T121-107 | Knock sensor 2 (G66) | knock_in | T12-C3-32 | Knock 2 | knock_in | corroborated | |
| OEM-T121-108 | Sensor ground | sensor_ground | T12-C2-21 + T12-C2-33 | Sensor Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-T121-115 | VVT camshaft adjustment valve (N205) | low_side_out | T12-C3-23 | PWM 5 | low_side_out | corroborated | |
| OEM-T121-117 | Throttle motor G186 (+) | hbridge_out | T12-C1-6 | Motor 1 + | hbridge_out | corroborated | |
| OEM-T121-118 | Throttle motor G186 (−) | hbridge_out | T12-C1-7 | Motor 1 - | hbridge_out | corroborated | |
| OEM-T121-121 | ECM + coil power (J271 relay feed) | power_in | T12-C1-31 | Ignition 12v In | power_in | corroborated | |
| OEM-T121-2 | ECU ground | ground | T12-C1-13 + T12-C1-14 | Power Ground 1 + Power Ground 2 | ground | corroborated | |
| OEM-T121-21 | ECM power (J271 relay feed) | power_in | T12-C1-31 | Ignition 12v In | power_in | corroborated | |
| OEM-T121-27 | MAF sensor supply (G70) | power_in | — | — | — | corroborated | |
| OEM-T121-29 | MAF sensor ground (G70) | sensor_ground | T12-C2-21 + T12-C2-33 | Sensor Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-T121-3 | Ignition switch +12V (term 15) | digital_in | — | — | — | corroborated | |
| OEM-T121-33 | Accelerator pedal position 1 (G79) | analog_in | T12-C2-5 | Analogue 3 | analog_in | corroborated | |
| OEM-T121-34 | Accelerator pedal position 1 ground (G79) | sensor_ground | T12-C2-21 + T12-C2-33 | Sensor Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-T121-35 | Accelerator pedal position 2 (G185) | analog_in | T12-C2-18 | Analogue 5 | analog_in | corroborated | |
| OEM-T121-36 | Accelerator pedal position 2 ground (G185) | sensor_ground | T12-C2-21 + T12-C2-33 | Sensor Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-T121-37 | Engine speed signal (tacho to cluster) | tacho_out | T12-C3-28 | PWM 10 | low_side_out | corroborated | |
| OEM-T121-43 | K-line diagnostics (OBD pin 7) | serial | — | — | — | corroborated | |
| OEM-T121-47 | Check engine light (MIL) | low_side_out | T12-C3-24 | PWM 6 | low_side_out | corroborated | |
| OEM-T121-48 | EPC warning light | low_side_out | T12-C3-25 | PWM 7 | low_side_out | corroborated | |
| OEM-T121-5 | Wideband lambda heater (Z19) | low_side_out | T12-C3-9 | Lambda 1 Heater Negative | low_side_out | corroborated | |
| OEM-T121-51 | Wideband lambda pump (G39) | wb_ip | T12-C3-7 | Lambda 1 Pump Current | wb_ip | corroborated | |
| OEM-T121-52 | Wideband lambda pump (G39) | wb_ip | T12-C3-1 | Lambda 2 Pump Current | wb_ip | corroborated | |
| OEM-T121-53 | MAF sensor signal (G70) | analog_in | T12-C2-10 | Analogue 1 | analog_in | corroborated | |
| OEM-T121-54 | Road speed signal (VSS) | digital_in | T12-C2-2 | Wheel 1 | digital_in | corroborated | |
| OEM-T121-58 | CAN bus low | can_l | T12-C3-34 | CAN 2 Low | can_l | corroborated | |
| OEM-T121-60 | CAN bus high | can_h | T12-C3-33 | CAN 2 High | can_h | corroborated | |
| OEM-T121-62 | Battery constant +12V (term 30) | power_in | T12-C3-26 | Permanent 12v | power_in | corroborated | |
| OEM-T121-63 | Post-cat lambda heater (Z29) | low_side_out | T12-C3-3 | Lambda 2 Heater Negative | low_side_out | corroborated | |
| OEM-T121-64 | EVAP canister valve (N80) | low_side_out | T12-C3-10 | PWM 8 | low_side_out | corroborated | |
| OEM-T121-65 | Fuel pump relay control | low_side_out | T12-C1-5 | PWM 1 | low_side_out | corroborated | |
| OEM-T121-66 | Secondary-air pump relay (J299) | low_side_out | T12-C1-4 | PWM 2 | low_side_out | corroborated | |
| OEM-T121-68 | Post-cat lambda signal (G130) | lambda_nb_in | T12-C3-17 | Analogue 7 | analog_in | corroborated | |
| OEM-T121-69 | Post-cat lambda signal (G130) | lambda_nb_in | T12-C3-18 | Analogue 8 | analog_in | corroborated | |
| OEM-T121-70 | Wideband lambda Nernst signal (G39) | wb_vs | T12-C3-12 | Lambda 1 Nernst Voltage | wb_vs | corroborated | |
| OEM-T121-71 | Wideband lambda Nernst signal (G39) | wb_vs | T12-C3-6 | Lambda 2 Nernst Voltage | wb_vs | corroborated | |
| OEM-T121-72 | Accelerator pedal position 1 5V supply (G79) | vref | T12-C2-24 | 5v Output | vref | corroborated | |
| OEM-T121-73 | Accelerator pedal position 2 5V supply (G185) | vref | T12-C2-9 | 5v Output | vref | corroborated | |
| OEM-T121-82 | Crank position sensor (G28) | trigger_in | T12-C2-12 | Crank | trigger_in | corroborated | |
| OEM-T121-83 | Throttle position sensor 5V supply (G187/G188) | vref | T12-C2-9 | 5v Output | vref | corroborated | |
| OEM-T121-84 | Throttle position sensor 1 (G187) | analog_in | T12-C2-6 | Analogue 4 | analog_in | corroborated | |
| OEM-T121-85 | Intake air temperature (G42) | temp_in | T12-C2-25 | Thermistor 2 | temp_in | corroborated | |
| OEM-T121-86 | Camshaft position sensor (G40) | trigger_in | T12-C2-22 | Cam 1 | trigger_in | corroborated | |
| OEM-T121-88 | Injector 4 (N33) | injector_out | T12-C1-25 | Injector 4 | injector_out | corroborated | |
| OEM-T121-89 | Injector 2 (N31) | injector_out | T12-C1-17 | Injector 2 | injector_out | corroborated | |
| OEM-T121-9 | Secondary-air injection valve (N112) | low_side_out | T12-C3-4 | PWM 9 | low_side_out | corroborated | |
| OEM-T121-90 | Crank position sensor ground (G28) | sensor_ground | T12-C2-21 + T12-C2-33 | Sensor Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-T121-91 | Throttle position sensor ground (G187/G188) | sensor_ground | T12-C2-21 + T12-C2-33 | Sensor Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-T121-92 | Throttle position sensor 2 (G188) | analog_in | T12-C2-19 | Analogue 6 | analog_in | corroborated | |
| OEM-T121-93 | Engine coolant temperature (G62) | temp_in | T12-C2-7 | Thermistor 1 | temp_in | corroborated | |
| OEM-T121-94 | Ignition coil 4 (N163) | ignition_out | T12-C1-26 | Coil 4 | ignition_out | corroborated | |
| OEM-T121-95 | Ignition coil 2 (N128) | ignition_out | T12-C1-18 | Coil 2 | ignition_out | corroborated | |
| OEM-T121-96 | Injector 1 (N30) | injector_out | T12-C1-9 | Injector 1 | injector_out | corroborated | |
| OEM-T121-97 | Injector 3 (N32) | injector_out | T12-C1-34 | Injector 3 | injector_out | corroborated | |
| OEM-T121-98 | Cam + boost sensor 5V supply (G40/G31) | vref | T12-C2-24 | 5v Output | vref | corroborated | |
| OEM-T121-99 | Knock sensor 5V supply (G61/G66) | vref | T12-C2-9 | 5v Output | 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 | T12-C1-31 | 0.85 | no route | Ignition 12v In | — | |
| W4 | OEM-T121-62 | T12-C3-26 | 0.85 | no route | Battery constant +12V (term 30) | — | |
| W5 | OEM-T121-1 | SP-GND-1 | 0.85 | no route | ECU ground | — | |
| W6 | OEM-T121-2 | SP-GND-1 | 0.85 | no route | ECU ground | — | |
| W7 | SP-GND-1 | T12-C1-13 | 0.85 | no route | Power Ground 1 | — | |
| W8 | SP-GND-1 | T12-C1-14 | 0.85 | no route | Power Ground 2 | — | |
| W9 | OEM-T121-108 | SP-0V-1 | 0.5 | no route | Sensor ground | — | |
| W10 | OEM-T121-29 | SP-0V-1 | 0.5 | no route | MAF sensor ground (G70) | — | |
| W11 | OEM-T121-34 | SP-0V-1 | 0.5 | no route | Accelerator pedal position 1 ground (G79) | — | |
| W12 | OEM-T121-36 | SP-0V-1 | 0.5 | no route | Accelerator pedal position 2 ground (G185) | — | |
| W13 | OEM-T121-90 | SP-0V-1 | 0.5 | no route | Crank position sensor ground (G28) | — | |
| W14 | OEM-T121-91 | SP-0V-1 | 0.5 | no route | Throttle position sensor ground (G187/G188) | — | |
| W15 | SP-0V-1 | T12-C2-21 | 0.5 | no route | Sensor Ground | — | |
| W16 | SP-0V-1 | T12-C2-33 | 0.5 | no route | Sensor Ground | — | |
| W17 | OEM-T121-72 | SP-5V1-1 | 0.5 | no route | Accelerator pedal position 1 5V supply (G79) | — | |
| W18 | OEM-T121-98 | SP-5V1-1 | 0.5 | no route | Cam + boost sensor 5V supply (G40/G31) | — | |
| W19 | SP-5V1-1 | T12-C2-24 | 0.5 | no route | 5v Output | — | |
| W20 | OEM-T121-73 | SP-5V2-1 | 0.5 | no route | Accelerator pedal position 2 5V supply (G185) | — | |
| W21 | OEM-T121-83 | SP-5V2-1 | 0.5 | no route | Throttle position sensor 5V supply (G187/G188) | — | |
| W22 | OEM-T121-99 | SP-5V2-1 | 0.5 | no route | Knock sensor 5V supply (G61/G66) | — | |
| W23 | SP-5V2-1 | T12-C2-9 | 0.5 | no route | 5v Output | — | |
| W24 | OEM-T121-82 | T12-C2-12 | 0.5 | no route | Crank position sensor (G28) | — | |
| W25 | OEM-T121-86 | T12-C2-22 | 0.5 | no route | Camshaft position sensor (G40) | — | |
| W26 | OEM-T121-106 | T12-C3-31 | 0.5 | no route | Knock sensor 1 (G61) | — | |
| W27 | OEM-T121-107 | T12-C3-32 | 0.5 | no route | Knock sensor 2 (G66) | — | |
| W28 | OEM-T121-102 | T12-C1-10 | 0.5 | no route | Ignition coil 1 (N127) | — | |
| W29 | OEM-T121-95 | T12-C1-18 | 0.5 | no route | Ignition coil 2 (N128) | — | |
| W30 | OEM-T121-103 | T12-C1-1 | 0.5 | no route | Ignition coil 3 (N158) | — | |
| W31 | OEM-T121-94 | T12-C1-26 | 0.5 | no route | Ignition coil 4 (N163) | — | |
| W32 | OEM-T121-96 | T12-C1-9 | 0.5 | no route | Injector 1 (N30) | — | |
| W33 | OEM-T121-89 | T12-C1-17 | 0.5 | no route | Injector 2 (N31) | — | |
| W34 | OEM-T121-97 | T12-C1-34 | 0.5 | no route | Injector 3 (N32) | — | |
| W35 | OEM-T121-88 | T12-C1-25 | 0.5 | no route | Injector 4 (N33) | — | |
| W36 | OEM-T121-118 | T12-C1-7 | 0.5 | no route | Throttle motor G186 (−) | — | |
| W37 | OEM-T121-117 | T12-C1-6 | 0.5 | no route | Throttle motor G186 (+) | — | |
| W38 | OEM-T121-53 | T12-C2-10 | 0.5 | no route | MAF sensor signal (G70) | — | |
| W39 | OEM-T121-101 | T12-C2-1 | 0.5 | no route | Boost pressure sensor (G31) | — | |
| W40 | OEM-T121-33 | T12-C2-5 | 0.5 | no route | Accelerator pedal position 1 (G79) | — | |
| W41 | OEM-T121-84 | T12-C2-6 | 0.5 | no route | Throttle position sensor 1 (G187) | — | |
| W42 | OEM-T121-35 | T12-C2-18 | 0.5 | no route | Accelerator pedal position 2 (G185) | — | |
| W43 | OEM-T121-92 | T12-C2-19 | 0.5 | no route | Throttle position sensor 2 (G188) | — | |
| W44 | OEM-T121-93 | T12-C2-7 | 0.5 | no route | Engine coolant temperature (G62) | — | |
| W45 | OEM-T121-65 | T12-C1-5 | 0.5 | no route | Fuel pump relay control | — | |
| W46 | OEM-T121-66 | T12-C1-4 | 0.5 | no route | Secondary-air pump relay (J299) | — | |
| W47 | OEM-T121-5 | T12-C3-9 | 0.5 | no route | Wideband lambda heater (Z19) | — | |
| W48 | OEM-T121-63 | T12-C3-3 | 0.5 | no route | Post-cat lambda heater (Z29) | — | |
| W49 | OEM-T121-104 | T12-C1-3 | 0.5 | no route | Boost control solenoid (N75) | — | |
| W50 | OEM-T121-105 | T12-C3-22 | 0.5 | no route | Diverter valve (N249) | — | |
| W51 | OEM-T121-115 | T12-C3-23 | 0.5 | no route | VVT camshaft adjustment valve (N205) | — | |
| W52 | OEM-T121-47 | T12-C3-24 | 0.5 | no route | Check engine light (MIL) | — | |
| W53 | OEM-T121-48 | T12-C3-25 | 0.5 | no route | EPC warning light | — | |
| W54 | OEM-T121-64 | T12-C3-10 | 0.5 | no route | EVAP canister valve (N80) | — | |
| W55 | OEM-T121-9 | T12-C3-4 | 0.5 | no route | Secondary-air injection valve (N112) | — | |
| W56 | OEM-T121-37 | T12-C3-28 | 0.5 | no route | Engine speed signal (tacho to cluster) | — | |
| W57 | OEM-T121-51 | T12-C3-7 | 0.5 | no route | Wideband lambda pump (G39) | — | |
| W58 | OEM-T121-52 | T12-C3-1 | 0.5 | no route | Wideband lambda pump (G39) | — | |
| W59 | OEM-T121-70 | T12-C3-12 | 0.5 | no route | Wideband lambda Nernst signal (G39) | — | |
| W60 | OEM-T121-71 | T12-C3-6 | 0.5 | no route | Wideband lambda Nernst signal (G39) | — | |
| W61 | OEM-T121-68 | T12-C3-17 | 0.5 | no route | Post-cat lambda signal (G130) | — | |
| W62 | OEM-T121-69 | T12-C3-18 | 0.5 | no route | Post-cat lambda signal (G130) | — | |
| W63 | OEM-T121-85 | T12-C2-25 | 0.5 | no route | Intake air temperature (G42) | — | |
| W64 | OEM-T121-54 | T12-C2-2 | 0.5 | no route | Road speed signal (VSS) | — | |
| W65 | OEM-T121-60 | T12-C3-33 | 0.5 | no route | CAN bus high | — | |
| W66 | OEM-T121-58 | T12-C3-34 | 0.5 | no route | CAN bus low | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|---|---|---|---|---|
| connector | 4-1437290-0 | TE | Superseal 1.0 34-way plug, Key 1 | 3.000 | ea |
| terminal | 3-1447221-4 | TE | Superseal 1.0 socket terminal, 20 AWG (0.5 sq mm) | 51.000 | ea |
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| No configured channels. | |||||||
Findings
Open (10)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | PHYS_REQUIRED_OPEN | T12-C3-27 | T12-C3-27 "Permanent 12v" is required but not wired. |
| error | REQUIRED_UNMAPPED | OEM-T121-3 | Required OEM function "Ignition switch +12V (term 15)" (digital_in) is not connected to the new ECU. |
| warn | DBW_MOTOR_CURRENT | T12-C1-6 | Cannot confirm T12 can drive the throttle motor: neither the motor stall current (OEM-T121-117) nor the peak rating of T12-C1-6 "Motor 1 +" is known. |
| warn | DBW_MOTOR_CURRENT | T12-C1-7 | Cannot confirm T12 can drive the throttle motor: neither the motor stall current (OEM-T121-118) nor the peak rating of T12-C1-7 "Motor 1 -" is known. |
| warn | DBW_SHARED_5V | OEM-T121-72 + OEM-T121-98 + SP-5V1-1 + T12-C2-24 | These 5 V supplies are separate in the stock car (OEM-T121-72 [pedal1], OEM-T121-98 [cam_boost]) and here share one ECU 5 V (T12-C2-24). On a drive-by-wire car the OEM splits them so one short or fault can't corrupt both throttle/pedal tracks at once. T12 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 | OEM-T121-73 + OEM-T121-83 + OEM-T121-99 + SP-5V2-1 + T12-C2-9 | These 5 V supplies are separate in the stock car (OEM-T121-73 [pedal2], OEM-T121-83 [tps], OEM-T121-99 [knock]) and here share one ECU 5 V (T12-C2-9). On a drive-by-wire car the OEM splits them so one short or fault can't corrupt both throttle/pedal tracks at once. T12 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 | OEM-T121-72 + OEM-T121-98 + SP-5V1-1 + T12-C2-24 | Supplies meant to stay independent share one net: OEM-T121-72 [pedal1], 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. |
| warn | SUPPLY_GROUP | OEM-T121-73 + OEM-T121-83 + OEM-T121-99 + SP-5V2-1 + T12-C2-9 | Supplies meant to stay independent share one net: OEM-T121-73 [pedal2], 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. |
| info | NET_FAMILY | OEM-T121-37 ↔ T12-C3-28 | OEM-T121-37 "Engine speed signal (tacho to cluster)" [tacho_out] is wired to T12-C3-28 "PWM 10" [low_side_out]. Tacho as a low-side output: check the tach needs a pull-up. |
| info | UNMAPPED | OEM | 2 optional OEM pins are not mapped: OEM-T121-27 MAF sensor supply (G70); OEM-T121-43 K-line diagnostics (OBD pin 7) |
Accepted (0)
| Code | Subject | Reason | By |
|---|
Notes
Auto-mapped by auto_map() from the library pin data on 2026-10-11. Review every wire against both manuals before building. Open items: - OEM-T121 3: Ignition switch +12V (term 15): key-on 12 V sense — optional in a swap (the main relay is energized from keyed 12 V, not from this pin); DTAFast T12 has no dedicated key-on input - T12-C3 27: Permanent 12v: required by DTAFast T12 but no stock pin feeds it; wire by hand Not wired: - OEM-T121 43: K-line diagnostics (OBD pin 7): no free k_line on DTAFast T12 - 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 | DTAFast T12+ ECU wiring diagram (served for T12 and T12+) | https://cdn.shopify.com/s/files/1/0848/7508/4108/files/T12PLUS_Wiring-Diagram.pdf?v=1728572014 | — | — | — |
| 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 | — | — | — |