VW Golf Mk4 1.8T 20v (AUM, Bosch ME7.5) DBW → DTAFast T2i (auto)
VW Golf Mk4 1.8T 20v (AUM, Bosch ME7.5) DBW — DTAFast — T2i
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 2026-10-23
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 | 45 wires · 6 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 | T2I-C1-31 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-T121-62 | T2I-C1-21 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-T121-1 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-T121-2 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | SP-GND-1 | T2I-C1-13 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | T2I-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 | T2I-C1-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | SP-0V-1 | T2I-C1-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-T121-72 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-T121-73 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-T121-83 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-T121-98 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-T121-99 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | SP-5V1-1 | T2I-C1-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-T121-82 | T2I-C1-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-T121-86 | T2I-C1-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-T121-102 | T2I-C1-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-T121-95 | T2I-C1-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-T121-53 | T2I-C1-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-T121-101 | T2I-C1-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-T121-33 | T2I-C1-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-T121-84 | T2I-C1-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-T121-35 | T2I-C1-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-T121-92 | T2I-C1-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-T121-93 | T2I-C1-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-T121-65 | T2I-C1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-T121-66 | T2I-C1-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-T121-5 | T2I-C1-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-T121-63 | T2I-C1-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-T121-25 | T2I-C1-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-T121-51 | T2I-C1-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-T121-70 | T2I-C1-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-T121-85 | T2I-C1-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-T121-54 | T2I-C1-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-T121-28 | T2I-C1-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-T121-60 | T2I-C1-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-T121-58 | T2I-C1-17 | 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 | T2I-C1-13 | T2I-C1-21 | open (OL) | power ground must not touch +12 V supply | |
| 2 | T2I-C1-13 | T2I-C1-27 | open (OL) | power ground must not touch 5 V sensor reference | |
| 3 | T2I-C1-13 | T2I-C1-31 | open (OL) | power ground must not touch +12 V supply | |
| 4 | T2I-C1-21 | T2I-C1-27 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 5 | T2I-C1-28 | T2I-C1-21 | open (OL) | sensor ground must not touch +12 V supply | |
| 6 | T2I-C1-28 | T2I-C1-27 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 7 | T2I-C1-28 | T2I-C1-31 | open (OL) | sensor ground must not touch +12 V supply | |
| 8 | T2I-C1-31 | T2I-C1-27 | 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) | — | W28 | — | 0.5 | T2I-C1-22 | — | — | — |
| 102 | Ignition coil 1 (N127) | — | W25 | — | 0.5 | T2I-C1-3 | — | — | — |
| 103 | Ignition coil 3 (N158) | — | — | — | — | — | — | — | — |
| 104 | Boost control solenoid (N75) | — | — | — | — | — | — | — | — |
| 105 | Diverter valve (N249) | — | — | — | — | — | — | — | — |
| 106 | Knock sensor 1 (G61) | — | — | — | — | — | — | — | — |
| 107 | Knock sensor 2 (G66) | — | — | — | — | — | — | — | — |
| 108 | Sensor ground | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| 115 | VVT camshaft adjustment valve (N205) | — | — | — | — | — | — | — | — |
| 117 | Throttle motor G186 (+) | — | — | — | — | — | — | — | — |
| 118 | Throttle motor G186 (−) | — | — | — | — | — | — | — | — |
| 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 | — | — | — |
| 22 | Brake vacuum pump (V192) | — | — | — | — | — | — | — | — |
| 25 | V144 Evaporative diagnostic pump (Pin 2) | — | W38 | — | 0.5 | T2I-C1-26 | — | — | — |
| 27 | MAF sensor supply (G70) | — | — | — | — | — | — | — | — |
| 28 | Alternator DF terminal (charge warning) | — | W43 | — | 0.5 | T2I-C1-30 | — | — | — |
| 29 | MAF sensor ground (G70) | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| 3 | Ignition switch +12V (term 15) | — | — | — | — | — | — | — | — |
| 33 | Accelerator pedal position 1 (G79) | — | W29 | — | 0.5 | T2I-C1-23 | — | — | — |
| 34 | Accelerator pedal position 1 ground (G79) | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| 35 | Accelerator pedal position 2 (G185) | — | W31 | — | 0.5 | T2I-C1-33 | — | — | — |
| 36 | Accelerator pedal position 2 ground (G185) | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 37 | Engine speed signal (tacho to cluster) | — | — | — | — | — | — | — | — |
| 38 | Cruise control switch (E45) | — | — | — | — | — | — | — | — |
| 39 | Clutch pedal switch (F36) | — | — | — | — | — | — | — | — |
| 40 | A/C signal | — | — | — | — | — | — | — | — |
| 41 | A/C signal | — | — | — | — | — | — | — | — |
| 43 | K-line diagnostics (OBD pin 7) | — | — | — | — | — | — | — | — |
| 47 | Check engine light (MIL) | — | — | — | — | — | — | — | — |
| 48 | EPC warning light | — | — | — | — | — | — | — | — |
| 49 | Power steering pressure switch (F88) | — | — | — | — | — | — | — | — |
| 5 | Wideband lambda heater (Z19) | — | W36 | — | 0.5 | T2I-C1-15 | — | — | — |
| 50 | Power steering pressure switch supply (F88) | — | — | — | — | — | — | — | — |
| 51 | Wideband lambda pump (G39) | — | W39 | — | 0.5 | T2I-C1-5 | — | — | — |
| 52 | Wideband lambda pump (G39) | — | — | — | — | — | — | — | — |
| 53 | MAF sensor signal (G70) | — | W27 | — | 0.5 | T2I-C1-20 | — | — | — |
| 54 | Road speed signal (VSS) | — | W42 | — | 0.5 | T2I-C1-11 | — | — | — |
| 55 | Brake pedal switch (F) | — | — | — | — | — | — | — | — |
| 56 | Brake pedal switch (F) | — | — | — | — | — | — | — | — |
| 57 | Cruise control switch (E45) | — | — | — | — | — | — | — | — |
| 58 | CAN bus low | — | W45 | — | 0.5 | T2I-C1-17 | — | — | — |
| 60 | CAN bus high | — | W44 | — | 0.5 | T2I-C1-16 | — | — | — |
| 62 | Battery constant +12V (term 30) | — | W4 | — | 0.85 | T2I-C1-21 | — | — | — |
| 63 | Post-cat lambda heater (Z29) | — | W37 | — | 0.5 | T2I-C1-18 | — | — | — |
| 64 | EVAP canister valve (N80) | — | — | — | — | — | — | — | — |
| 65 | Fuel pump relay control | — | W34 | — | 0.5 | T2I-C1-1 | — | — | — |
| 66 | Secondary-air pump relay (J299) | — | W35 | — | 0.5 | T2I-C1-10 | — | — | — |
| 67 | Crash sensor signal | — | — | — | — | — | — | — | — |
| 68 | Post-cat lambda signal (G130) | — | — | — | — | — | — | — | — |
| 69 | Post-cat lambda signal (G130) | — | — | — | — | — | — | — | — |
| 70 | Wideband lambda Nernst signal (G39) | — | W40 | — | 0.5 | T2I-C1-2 | — | — | — |
| 71 | Wideband lambda Nernst signal (G39) | — | — | — | — | — | — | — | — |
| 72 | Accelerator pedal position 1 5V supply (G79) | — | W17 | — | 0.5 | SP-5V1-1 | — | — | — |
| 73 | Accelerator pedal position 2 5V supply (G185) | — | W18 | — | 0.5 | SP-5V1-1 | — | — | — |
| 75 | Cruise control switch (E45) | — | — | — | — | — | — | — | — |
| 76 | Cruise control switch (E45) | — | — | — | — | — | — | — | — |
| 80 | V144 Evap Diagnostic Pump (Pin 1) | — | — | — | — | — | — | — | — |
| 82 | Crank position sensor (G28) | — | W23 | — | 0.5 | T2I-C1-19 | — | — | — |
| 83 | Throttle position sensor 5V supply (G187/G188) | — | W19 | — | 0.5 | SP-5V1-1 | — | — | — |
| 84 | Throttle position sensor 1 (G187) | — | W30 | — | 0.5 | T2I-C1-25 | — | — | — |
| 85 | Intake air temperature (G42) | — | W41 | — | 0.5 | T2I-C1-32 | — | — | — |
| 86 | Camshaft position sensor (G40) | — | W24 | — | 0.5 | T2I-C1-12 | — | — | — |
| 88 | Injector 4 (N33) | — | — | — | — | — | — | — | — |
| 89 | Injector 2 (N31) | — | — | — | — | — | — | — | — |
| 9 | Secondary-air injection valve (N112) | — | — | — | — | — | — | — | — |
| 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) | — | W32 | — | 0.5 | T2I-C1-34 | — | — | — |
| 93 | Engine coolant temperature (G62) | — | W33 | — | 0.5 | T2I-C1-24 | — | — | — |
| 94 | Ignition coil 4 (N163) | — | — | — | — | — | — | — | — |
| 95 | Ignition coil 2 (N128) | — | W26 | — | 0.5 | T2I-C1-6 | — | — | — |
| 96 | Injector 1 (N30) | — | — | — | — | — | — | — | — |
| 97 | Injector 3 (N32) | — | — | — | — | — | — | — | — |
| 98 | Cam + boost sensor 5V supply (G40/G31) | — | W20 | — | 0.5 | SP-5V1-1 | — | — | — |
| 99 | Knock sensor 5V supply (G61/G66) | — | W21 | — | 0.5 | SP-5V1-1 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W9 | — | 0.5 | OEM-T121-108 | — | — | — |
| 1 | — | — | W10 | — | 0.5 | OEM-T121-29 | — | — | — |
| 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 | T2I-C1-28 | — | — | — |
| 1 | — | — | W16 | — | 0.5 | T2I-C1-29 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W2 | — | 0.85 | OEM-T121-21 | — | — | — |
| 1 | — | — | W1 | — | 0.85 | OEM-T121-121 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | T2I-C1-31 | — | — | — |
SP-5V1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W18 | — | 0.5 | OEM-T121-73 | — | — | — |
| 1 | — | — | W19 | — | 0.5 | OEM-T121-83 | — | — | — |
| 1 | — | — | W20 | — | 0.5 | OEM-T121-98 | — | — | — |
| 1 | — | — | W17 | — | 0.5 | OEM-T121-72 | — | — | — |
| 1 | — | — | W21 | — | 0.5 | OEM-T121-99 | — | — | — |
| 1 | — | — | W22 | — | 0.5 | T2I-C1-27 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W8 | — | 0.85 | T2I-C1-14 | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-T121-1 | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-T121-2 | — | — | — |
| 1 | — | — | W7 | — | 0.85 | T2I-C1-13 | — | — | — |
T2I-C1
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | PWM 1 | — | W34 | — | 0.5 | OEM-T121-65 | — | — | — |
| 2 | Lambda Nernst Voltage | — | W40 | — | 0.5 | OEM-T121-70 | — | — | — |
| 3 | Coil 1 | — | W25 | — | 0.5 | OEM-T121-102 | — | — | — |
| 4 | Lambda VGND | — | — | — | — | — | — | — | — |
| 5 | Lambda Pump Current | — | W39 | — | 0.5 | OEM-T121-51 | — | — | — |
| 6 | Coil 2 | — | W26 | — | 0.5 | OEM-T121-95 | — | — | — |
| 7 | Lambda Trim Resistor | — | — | — | — | — | — | — | — |
| 8 | — | — | — | — | — | — | — | — | — |
| 9 | — | — | — | — | — | — | — | — | — |
| 10 | PWM 2 | — | W35 | — | 0.5 | OEM-T121-66 | — | — | — |
| 11 | Digital 1 | — | W42 | — | 0.5 | OEM-T121-54 | — | — | — |
| 12 | Wheel 1 | — | W24 | — | 0.5 | OEM-T121-86 | — | — | — |
| 13 | Power Ground 1 | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 14 | Power Ground 2 | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 15 | Lambda Heater Negative | — | W36 | — | 0.5 | OEM-T121-5 | — | — | — |
| 16 | CAN High | — | W44 | — | 0.5 | OEM-T121-60 | — | — | — |
| 17 | CAN Low | — | W45 | — | 0.5 | OEM-T121-58 | — | — | — |
| 18 | PWM 3 | — | W37 | — | 0.5 | OEM-T121-63 | — | — | — |
| 19 | Crank | — | W23 | — | 0.5 | OEM-T121-82 | — | — | — |
| 20 | Analogue 1 | — | W27 | — | 0.5 | OEM-T121-53 | — | — | — |
| 21 | Permanent 12v | — | W4 | — | 0.85 | OEM-T121-62 | — | — | — |
| 22 | Analogue 2 | — | W28 | — | 0.5 | OEM-T121-101 | — | — | — |
| 23 | Analogue 3 | — | W29 | — | 0.5 | OEM-T121-33 | — | — | — |
| 24 | Thermistor 1 | — | W33 | — | 0.5 | OEM-T121-93 | — | — | — |
| 25 | Analogue 4 | — | W30 | — | 0.5 | OEM-T121-84 | — | — | — |
| 26 | PWM 4 | — | W38 | — | 0.5 | OEM-T121-25 | — | — | — |
| 27 | 5v Output | — | W22 | — | 0.5 | SP-5V1-1 | — | — | — |
| 28 | Sensor Ground | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 29 | Sensor Ground | — | W16 | — | 0.5 | SP-0V-1 | — | — | — |
| 30 | Digital 2 | — | W43 | — | 0.5 | OEM-T121-28 | — | — | — |
| 31 | Ignition 12v In | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 32 | Thermistor 2 | — | W41 | — | 0.5 | OEM-T121-85 | — | — | — |
| 33 | Analogue 5 | — | W31 | — | 0.5 | OEM-T121-35 | — | — | — |
| 34 | Analogue 6 | — | W32 | — | 0.5 | OEM-T121-92 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-T121-1 | ECU ground | ground | T2I-C1-13 + T2I-C1-14 | Power Ground 1 + Power Ground 2 | ground | corroborated | |
| OEM-T121-101 | Boost pressure sensor (G31) | analog_in | T2I-C1-22 | Analogue 2 | analog_in | corroborated | |
| OEM-T121-102 | Ignition coil 1 (N127) | ignition_out | T2I-C1-3 | Coil 1 | ignition_out | corroborated | |
| OEM-T121-103 | Ignition coil 3 (N158) | ignition_out | — | — | — | corroborated | |
| OEM-T121-104 | Boost control solenoid (N75) | low_side_out | — | — | — | corroborated | |
| OEM-T121-105 | Diverter valve (N249) | low_side_out | — | — | — | corroborated | |
| OEM-T121-106 | Knock sensor 1 (G61) | knock_in | — | — | — | corroborated | |
| OEM-T121-107 | Knock sensor 2 (G66) | knock_in | — | — | — | corroborated | |
| OEM-T121-108 | Sensor ground | sensor_ground | T2I-C1-28 + T2I-C1-29 | Sensor Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-T121-115 | VVT camshaft adjustment valve (N205) | low_side_out | — | — | — | corroborated | |
| OEM-T121-117 | Throttle motor G186 (+) | hbridge_out | — | — | — | corroborated | |
| OEM-T121-118 | Throttle motor G186 (−) | hbridge_out | — | — | — | corroborated | |
| OEM-T121-121 | ECM + coil power (J271 relay feed) | power_in | T2I-C1-31 | Ignition 12v In | power_in | corroborated | |
| OEM-T121-2 | ECU ground | ground | T2I-C1-13 + T2I-C1-14 | Power Ground 1 + Power Ground 2 | ground | corroborated | |
| OEM-T121-21 | ECM power (J271 relay feed) | power_in | T2I-C1-31 | Ignition 12v In | power_in | corroborated | |
| OEM-T121-22 | Brake vacuum pump (V192) | low_side_out | — | — | — | single_source | |
| OEM-T121-25 | V144 Evaporative diagnostic pump (Pin 2) | low_side_out | T2I-C1-26 | PWM 4 | low_side_out | corroborated | |
| OEM-T121-27 | MAF sensor supply (G70) | power_in | — | — | — | corroborated | |
| OEM-T121-28 | Alternator DF terminal (charge warning) | digital_in | T2I-C1-30 | Digital 2 | digital_in | single_source | |
| OEM-T121-29 | MAF sensor ground (G70) | sensor_ground | T2I-C1-28 + T2I-C1-29 | 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 | T2I-C1-23 | Analogue 3 | analog_in | corroborated | |
| OEM-T121-34 | Accelerator pedal position 1 ground (G79) | sensor_ground | T2I-C1-28 + T2I-C1-29 | Sensor Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-T121-35 | Accelerator pedal position 2 (G185) | analog_in | T2I-C1-33 | Analogue 5 | analog_in | corroborated | |
| OEM-T121-36 | Accelerator pedal position 2 ground (G185) | sensor_ground | T2I-C1-28 + T2I-C1-29 | Sensor Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-T121-37 | Engine speed signal (tacho to cluster) | tacho_out | — | — | — | corroborated | |
| OEM-T121-38 | Cruise control switch (E45) | digital_in | — | — | — | single_source | |
| OEM-T121-39 | Clutch pedal switch (F36) | digital_in | — | — | — | single_source | |
| OEM-T121-40 | A/C signal | digital_in | — | — | — | single_source | |
| OEM-T121-41 | A/C signal | digital_in | — | — | — | single_source | |
| OEM-T121-43 | K-line diagnostics (OBD pin 7) | serial | — | — | — | corroborated | |
| OEM-T121-47 | Check engine light (MIL) | low_side_out | — | — | — | corroborated | |
| OEM-T121-48 | EPC warning light | low_side_out | — | — | — | corroborated | |
| OEM-T121-49 | Power steering pressure switch (F88) | digital_in | — | — | — | single_source | |
| OEM-T121-5 | Wideband lambda heater (Z19) | low_side_out | T2I-C1-15 | Lambda Heater Negative | low_side_out | corroborated | |
| OEM-T121-50 | Power steering pressure switch supply (F88) | power_in | — | — | — | single_source | |
| OEM-T121-51 | Wideband lambda pump (G39) | wb_ip | T2I-C1-5 | Lambda Pump Current | wb_ip | corroborated | |
| OEM-T121-52 | Wideband lambda pump (G39) | wb_ip | — | — | — | corroborated | |
| OEM-T121-53 | MAF sensor signal (G70) | analog_in | T2I-C1-20 | Analogue 1 | analog_in | corroborated | |
| OEM-T121-54 | Road speed signal (VSS) | digital_in | T2I-C1-11 | Digital 1 | digital_in | corroborated | |
| OEM-T121-55 | Brake pedal switch (F) | digital_in | — | — | — | single_source | |
| OEM-T121-56 | Brake pedal switch (F) | digital_in | — | — | — | single_source | |
| OEM-T121-57 | Cruise control switch (E45) | digital_in | — | — | — | single_source | |
| OEM-T121-58 | CAN bus low | can_l | T2I-C1-17 | CAN Low | can_l | corroborated | |
| OEM-T121-60 | CAN bus high | can_h | T2I-C1-16 | CAN High | can_h | corroborated | |
| OEM-T121-62 | Battery constant +12V (term 30) | power_in | T2I-C1-21 | Permanent 12v | power_in | corroborated | |
| OEM-T121-63 | Post-cat lambda heater (Z29) | low_side_out | T2I-C1-18 | PWM 3 | low_side_out | corroborated | |
| OEM-T121-64 | EVAP canister valve (N80) | low_side_out | — | — | — | corroborated | |
| OEM-T121-65 | Fuel pump relay control | low_side_out | T2I-C1-1 | PWM 1 | low_side_out | corroborated | |
| OEM-T121-66 | Secondary-air pump relay (J299) | low_side_out | T2I-C1-10 | PWM 2 | low_side_out | corroborated | |
| OEM-T121-67 | Crash sensor signal | digital_in | — | — | — | single_source | |
| OEM-T121-68 | Post-cat lambda signal (G130) | lambda_nb_in | — | — | — | corroborated | |
| OEM-T121-69 | Post-cat lambda signal (G130) | lambda_nb_in | — | — | — | corroborated | |
| OEM-T121-70 | Wideband lambda Nernst signal (G39) | wb_vs | T2I-C1-2 | Lambda Nernst Voltage | wb_vs | corroborated | |
| OEM-T121-71 | Wideband lambda Nernst signal (G39) | wb_vs | — | — | — | corroborated | |
| OEM-T121-72 | Accelerator pedal position 1 5V supply (G79) | vref | T2I-C1-27 | 5v Output | vref | corroborated | |
| OEM-T121-73 | Accelerator pedal position 2 5V supply (G185) | vref | T2I-C1-27 | 5v Output | vref | corroborated | |
| OEM-T121-75 | Cruise control switch (E45) | digital_in | — | — | — | single_source | |
| OEM-T121-76 | Cruise control switch (E45) | digital_in | — | — | — | single_source | |
| OEM-T121-80 | V144 Evap Diagnostic Pump (Pin 1) | low_side_out | — | — | — | corroborated | |
| OEM-T121-82 | Crank position sensor (G28) | trigger_in | T2I-C1-19 | Crank | trigger_in | corroborated | |
| OEM-T121-83 | Throttle position sensor 5V supply (G187/G188) | vref | T2I-C1-27 | 5v Output | vref | corroborated | |
| OEM-T121-84 | Throttle position sensor 1 (G187) | analog_in | T2I-C1-25 | Analogue 4 | analog_in | corroborated | |
| OEM-T121-85 | Intake air temperature (G42) | temp_in | T2I-C1-32 | Thermistor 2 | temp_in | corroborated | |
| OEM-T121-86 | Camshaft position sensor (G40) | trigger_in | T2I-C1-12 | Wheel 1 | digital_in | corroborated | |
| OEM-T121-88 | Injector 4 (N33) | injector_out | — | — | — | corroborated | |
| OEM-T121-89 | Injector 2 (N31) | injector_out | — | — | — | corroborated | |
| OEM-T121-9 | Secondary-air injection valve (N112) | low_side_out | — | — | — | corroborated | |
| OEM-T121-90 | Crank position sensor ground (G28) | sensor_ground | T2I-C1-28 + T2I-C1-29 | Sensor Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-T121-91 | Throttle position sensor ground (G187/G188) | sensor_ground | T2I-C1-28 + T2I-C1-29 | Sensor Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-T121-92 | Throttle position sensor 2 (G188) | analog_in | T2I-C1-34 | Analogue 6 | analog_in | corroborated | |
| OEM-T121-93 | Engine coolant temperature (G62) | temp_in | T2I-C1-24 | Thermistor 1 | temp_in | corroborated | |
| OEM-T121-94 | Ignition coil 4 (N163) | ignition_out | — | — | — | corroborated | |
| OEM-T121-95 | Ignition coil 2 (N128) | ignition_out | T2I-C1-6 | Coil 2 | ignition_out | corroborated | |
| OEM-T121-96 | Injector 1 (N30) | injector_out | — | — | — | corroborated | |
| OEM-T121-97 | Injector 3 (N32) | injector_out | — | — | — | corroborated | |
| OEM-T121-98 | Cam + boost sensor 5V supply (G40/G31) | vref | T2I-C1-27 | 5v Output | vref | corroborated | |
| OEM-T121-99 | Knock sensor 5V supply (G61/G66) | vref | T2I-C1-27 | 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 | T2I-C1-31 | 0.85 | no route | Ignition 12v In | — | |
| W4 | OEM-T121-62 | T2I-C1-21 | 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 | T2I-C1-13 | 0.85 | no route | Power Ground 1 | — | |
| W8 | SP-GND-1 | T2I-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 | T2I-C1-28 | 0.5 | no route | Sensor Ground | — | |
| W16 | SP-0V-1 | T2I-C1-29 | 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-T121-73 | SP-5V1-1 | 0.5 | no route | Accelerator pedal position 2 5V supply (G185) | — | |
| W19 | OEM-T121-83 | SP-5V1-1 | 0.5 | no route | Throttle position sensor 5V supply (G187/G188) | — | |
| W20 | OEM-T121-98 | SP-5V1-1 | 0.5 | no route | Cam + boost sensor 5V supply (G40/G31) | — | |
| W21 | OEM-T121-99 | SP-5V1-1 | 0.5 | no route | Knock sensor 5V supply (G61/G66) | — | |
| W22 | SP-5V1-1 | T2I-C1-27 | 0.5 | no route | 5v Output | — | |
| W23 | OEM-T121-82 | T2I-C1-19 | 0.5 | no route | Crank position sensor (G28) | — | |
| W24 | OEM-T121-86 | T2I-C1-12 | 0.5 | no route | Camshaft position sensor (G40) | — | |
| W25 | OEM-T121-102 | T2I-C1-3 | 0.5 | no route | Ignition coil 1 (N127) | — | |
| W26 | OEM-T121-95 | T2I-C1-6 | 0.5 | no route | Ignition coil 2 (N128) | — | |
| W27 | OEM-T121-53 | T2I-C1-20 | 0.5 | no route | MAF sensor signal (G70) | — | |
| W28 | OEM-T121-101 | T2I-C1-22 | 0.5 | no route | Boost pressure sensor (G31) | — | |
| W29 | OEM-T121-33 | T2I-C1-23 | 0.5 | no route | Accelerator pedal position 1 (G79) | — | |
| W30 | OEM-T121-84 | T2I-C1-25 | 0.5 | no route | Throttle position sensor 1 (G187) | — | |
| W31 | OEM-T121-35 | T2I-C1-33 | 0.5 | no route | Accelerator pedal position 2 (G185) | — | |
| W32 | OEM-T121-92 | T2I-C1-34 | 0.5 | no route | Throttle position sensor 2 (G188) | — | |
| W33 | OEM-T121-93 | T2I-C1-24 | 0.5 | no route | Engine coolant temperature (G62) | — | |
| W34 | OEM-T121-65 | T2I-C1-1 | 0.5 | no route | Fuel pump relay control | — | |
| W35 | OEM-T121-66 | T2I-C1-10 | 0.5 | no route | Secondary-air pump relay (J299) | — | |
| W36 | OEM-T121-5 | T2I-C1-15 | 0.5 | no route | Wideband lambda heater (Z19) | — | |
| W37 | OEM-T121-63 | T2I-C1-18 | 0.5 | no route | Post-cat lambda heater (Z29) | — | |
| W38 | OEM-T121-25 | T2I-C1-26 | 0.5 | no route | V144 Evaporative diagnostic pump (Pin 2) | — | |
| W39 | OEM-T121-51 | T2I-C1-5 | 0.5 | no route | Wideband lambda pump (G39) | — | |
| W40 | OEM-T121-70 | T2I-C1-2 | 0.5 | no route | Wideband lambda Nernst signal (G39) | — | |
| W41 | OEM-T121-85 | T2I-C1-32 | 0.5 | no route | Intake air temperature (G42) | — | |
| W42 | OEM-T121-54 | T2I-C1-11 | 0.5 | no route | Road speed signal (VSS) | — | |
| W43 | OEM-T121-28 | T2I-C1-30 | 0.5 | no route | Alternator DF terminal (charge warning) | — | |
| W44 | OEM-T121-60 | T2I-C1-16 | 0.5 | no route | CAN bus high | — | |
| W45 | OEM-T121-58 | T2I-C1-17 | 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 | 1.000 | ea |
| terminal | 3-1447221-4 | TE | Superseal 1.0 socket terminal, 20 AWG (0.5 sq mm) | 30.000 | ea |
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| No configured channels. | |||||||
Findings
Open (7)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | REQUIRED_UNMAPPED | OEM-T121-117 | Required OEM function "Throttle motor G186 (+)" (hbridge_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-T121-118 | Required OEM function "Throttle motor G186 (−)" (hbridge_out) is not connected to the new ECU. |
| warn | DATASET_GAP | T2i C1 | 2 of 34 cavities on T2i C1 have no pin data (8,9). Anything there is invisible to these checks. |
| warn | DBW_SHARED_5V | OEM-T121-72 + OEM-T121-73 + OEM-T121-83 + OEM-T121-98 + OEM-T121-99 + SP-5V1-1 + T2I-C1-27 | These 5 V supplies are separate in the stock car (OEM-T121-72 [pedal1], OEM-T121-73 [pedal2], OEM-T121-83 [tps], OEM-T121-98 [cam_boost], OEM-T121-99 [knock]) and here share one ECU 5 V (T2I-C1-27). On a drive-by-wire car the OEM splits them so one short or fault can't corrupt both throttle/pedal tracks at once. T2i has 1 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 | NET_FAMILY | OEM-T121-86 ↔ T2I-C1-12 | OEM-T121-86 "Camshaft position sensor (G40)" [trigger_in] is wired to T2I-C1-12 "Wheel 1" [digital_in]. Hall-type cam/speed signals can use a digital input if it handles the frequency; VR signals cannot. |
| warn | SUPPLY_GROUP | OEM-T121-72 + OEM-T121-73 + OEM-T121-83 + OEM-T121-98 + OEM-T121-99 + SP-5V1-1 + T2I-C1-27 | Supplies meant to stay independent share one net: OEM-T121-72 [pedal1], OEM-T121-73 [pedal2], OEM-T121-83 [tps], OEM-T121-98 [cam_boost], 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 | UNMAPPED | OEM | 28 optional OEM pins are not mapped: OEM-T121-104 Boost control solenoid (N75); OEM-T121-105 Diverter valve (N249); OEM-T121-115 VVT camshaft adjustment valve (N205); OEM-T121-22 Brake vacuum pump (V192); OEM-T121-27 MAF sensor supply (G70); OEM-T121-37 Engine speed signal (tacho to cluster); OEM-T121-38 Cruise control switch (E45); OEM-T121-39 Clutch pedal switch (F36); OEM-T121-40 A/C signal; OEM-T121-41 A/C signal; OEM-T121-43 K-line diagnostics (OBD pin 7); OEM-T121-47 Check engine light (MIL); OEM-T121-48 EPC warning light; OEM-T121-49 Power steering pressure switch (F88); OEM-T121-50 Power steering pressure switch supply (F88); OEM-T121-52 Wideband lambda pump (G39); OEM-T121-55 Brake pedal switch (F); OEM-T121-56 Brake pedal switch (F); OEM-T121-57 Cruise control switch (E45); OEM-T121-64 EVAP canister valve (N80); OEM-T121-67 Crash sensor signal; OEM-T121-68 Post-cat lambda signal (G130); OEM-T121-69 Post-cat lambda signal (G130); OEM-T121-71 Wideband lambda Nernst signal (G39); OEM-T121-75 Cruise control switch (E45); OEM-T121-76 Cruise control switch (E45); OEM-T121-80 V144 Evap Diagnostic Pump (Pin 1); OEM-T121-9 Secondary-air injection valve (N112) |
Accepted (8)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-T121-103 | Ignition outputs are a documented capability limit: this ECU has fewer ignition channels than the engine has cylinders, so the remaining coils pair per firing order (wasted spark) and are not wired 1:1. | mapping-proposal |
| REQUIRED_UNMAPPED | OEM-T121-106 | Knock input is a documented capability limit: this ECU has no built-in knock sensor input, so the stock knock sensor cannot be wired to it (run without knock control, or add an external knock module). | mapping-proposal |
| REQUIRED_UNMAPPED | OEM-T121-107 | Knock input is a documented capability limit: this ECU has no built-in knock sensor input, so the stock knock sensor cannot be wired to it (run without knock control, or add an external knock module). | mapping-proposal |
| REQUIRED_UNMAPPED | OEM-T121-88 | Injector outputs are a documented capability limit: this ECU has no internal injector drivers, so the stock injectors need an external injector driver stage (or the ECU runs as an ignition-only piggyback). | mapping-proposal |
| REQUIRED_UNMAPPED | OEM-T121-89 | Injector outputs are a documented capability limit: this ECU has no internal injector drivers, so the stock injectors need an external injector driver stage (or the ECU runs as an ignition-only piggyback). | mapping-proposal |
| REQUIRED_UNMAPPED | OEM-T121-94 | Ignition outputs are a documented capability limit: this ECU has fewer ignition channels than the engine has cylinders, so the remaining coils pair per firing order (wasted spark) and are not wired 1:1. | mapping-proposal |
| REQUIRED_UNMAPPED | OEM-T121-96 | Injector outputs are a documented capability limit: this ECU has no internal injector drivers, so the stock injectors need an external injector driver stage (or the ECU runs as an ignition-only piggyback). | mapping-proposal |
| REQUIRED_UNMAPPED | OEM-T121-97 | Injector outputs are a documented capability limit: this ECU has no internal injector drivers, so the stock injectors need an external injector driver stage (or the ECU runs as an ignition-only piggyback). | mapping-proposal |
Notes
Fit check: needs add-on. Resolve these before building: - No drive-by-wire; needs a cable-throttle conversion or an external DBW controller - No injector outputs: this ECU has no internal injector drivers — the stock port injectors need an external injector driver stage, or use it as an ignition-only piggyback - No knock input; the stock knock sensor would be unused - Only 2 ignition outputs for 4 cylinders: wasted spark (pair coils per firing order) - 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 2026-10-23. Review every wire against both manuals before building. Open items: - OEM-T121 106: Knock sensor 1 (G61): no free knock input on DTAFast T2i - OEM-T121 107: Knock sensor 2 (G66): no free knock input on DTAFast T2i - OEM-T121 103: Ignition coil 3 (N158): no free ignition output on DTAFast T2i - OEM-T121 94: Ignition coil 4 (N163): no free ignition output on DTAFast T2i - OEM-T121 96: Injector 1 (N30): no free injector output on DTAFast T2i - OEM-T121 89: Injector 2 (N31): no free injector output on DTAFast T2i - OEM-T121 97: Injector 3 (N32): no free injector output on DTAFast T2i - OEM-T121 88: Injector 4 (N33): no free injector output on DTAFast T2i - OEM-T121 117: Throttle motor G186 (+): needs a paired H-bridge on DTAFast T2i (H-bridge pairing not in the library: set device_pin.bridge_pair from the ECU manual) - OEM-T121 118: Throttle motor G186 (−): needs a paired H-bridge on DTAFast T2i (H-bridge pairing not in the library: set device_pin.bridge_pair from the ECU manual) Not wired: - OEM-T121 3: Ignition switch +12V (term 15): key-on 12 V sense — handled by the chassis (it energises the main relay); not needed on this harness - OEM-T121 80: V144 Evap Diagnostic Pump (Pin 1): no free low_side/relay_control/heater_low_side/ls_hs/injector on DTAFast T2i - OEM-T121 104: Boost control solenoid (N75): no free low_side/relay_control/heater_low_side/ls_hs/injector on DTAFast T2i - OEM-T121 105: Diverter valve (N249): no free low_side/relay_control/heater_low_side/ls_hs/injector on DTAFast T2i - OEM-T121 115: VVT camshaft adjustment valve (N205): no free low_side/relay_control/heater_low_side/ls_hs/injector on DTAFast T2i - OEM-T121 22: Brake vacuum pump (V192): no free low_side/relay_control/heater_low_side/ls_hs/injector on DTAFast T2i - OEM-T121 47: Check engine light (MIL): no free low_side/relay_control/heater_low_side/ls_hs/injector on DTAFast T2i - OEM-T121 48: EPC warning light: no free low_side/relay_control/heater_low_side/ls_hs/injector on DTAFast T2i - OEM-T121 64: EVAP canister valve (N80): no free low_side/relay_control/heater_low_side/ls_hs/injector on DTAFast T2i - OEM-T121 9: Secondary-air injection valve (N112): no free low_side/relay_control/heater_low_side/ls_hs/injector on DTAFast T2i - OEM-T121 37: Engine speed signal (tacho to cluster): no free tacho/frequency_out/low_side/ls_hs on DTAFast T2i - OEM-T121 52: Wideband lambda pump (G39): no free wb_ip on DTAFast T2i - OEM-T121 71: Wideband lambda Nernst signal (G39): no free wb_vs on DTAFast T2i - OEM-T121 68: Post-cat lambda signal (G130): no free o2_narrowband/analog_0_5 on DTAFast T2i - OEM-T121 69: Post-cat lambda signal (G130): no free o2_narrowband/analog_0_5 on DTAFast T2i - OEM-T121 38: Cruise control switch (E45): no free switch_in/frequency_in/analog_0_5 on DTAFast T2i - OEM-T121 39: Clutch pedal switch (F36): no free switch_in/frequency_in/analog_0_5 on DTAFast T2i - OEM-T121 40: A/C signal: no free switch_in/frequency_in/analog_0_5 on DTAFast T2i - OEM-T121 41: A/C signal: no free switch_in/frequency_in/analog_0_5 on DTAFast T2i - OEM-T121 49: Power steering pressure switch (F88): no free switch_in/frequency_in/analog_0_5 on DTAFast T2i - OEM-T121 55: Brake pedal switch (F): no free switch_in/frequency_in/analog_0_5 on DTAFast T2i - OEM-T121 56: Brake pedal switch (F): no free switch_in/frequency_in/analog_0_5 on DTAFast T2i - OEM-T121 57: Cruise control switch (E45): no free switch_in/frequency_in/analog_0_5 on DTAFast T2i - OEM-T121 67: Crash sensor signal: no free switch_in/frequency_in/analog_0_5 on DTAFast T2i - OEM-T121 75: Cruise control switch (E45): no free switch_in/frequency_in/analog_0_5 on DTAFast T2i - OEM-T121 76: Cruise control switch (E45): no free switch_in/frequency_in/analog_0_5 on DTAFast T2i - OEM-T121 43: K-line diagnostics (OBD pin 7): no free k_line on DTAFast T2i - OEM-T121 27: MAF sensor supply (G70): no rule for class sensor_supply_in; wire by hand - OEM-T121 50: Power steering pressure switch supply (F88): no rule for class sensor_supply_in; wire by hand
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | DTAFast T2i ECU wiring diagram | https://cdn.shopify.com/s/files/1/0848/7508/4108/files/T2i_Wiring-Diagram.pdf?v=1728571341 | — | — | — |
| 3 | community_copy | NefMoto: ME7.5 1.8t Golf AWP ECU wiring breakdown (Bentley-derived) | https://nefariousmotorsports.com/forum/index.php?topic=18710.0 | — | — | — |
| 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 | — | — | — |