VW Golf Mk4 1.8T 20v (AUM, Bosch ME7.5) DBW → DTAFast T8+ (auto)
VW Golf Mk4 1.8T 20v (AUM, Bosch ME7.5) DBW — DTAFast — T8+
Drawn by Michael Gnankou · Rev 0 · proposal · 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 | proposal · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | none |
| Size of the job | 81 wires · 10 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 | T8-C1-31 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-T121-62 | T8-C3-26 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | NEW-BATT-1 | T8-C3-27 | 1.25 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-T121-1 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-T121-2 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | T8-C1-13 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | T8-C1-14 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-T121-108 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-T121-29 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-T121-34 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-T121-36 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-T121-90 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-T121-91 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | SP-0V-1 | T8-C2-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | SP-0V-1 | T8-C2-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-T121-72 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-T121-98 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | SP-5V1-1 | T8-C2-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-T121-73 | SP-5V2-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-T121-83 | SP-5V2-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-T121-99 | SP-5V2-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | SP-5V2-1 | T8-C2-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-T121-82 | T8-C2-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-T121-86 | T8-C2-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-T121-106 | T8-C3-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-T121-107 | T8-C3-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-T121-102 | T8-C1-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-T121-95 | T8-C1-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-T121-103 | T8-C1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-T121-94 | T8-C1-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-T121-96 | T8-C1-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-T121-89 | T8-C1-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-T121-97 | T8-C1-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-T121-88 | T8-C1-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-T121-118 | T8-C1-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-T121-117 | T8-C1-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-T121-53 | T8-C2-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-T121-101 | T8-C2-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-T121-33 | T8-C2-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-T121-84 | T8-C2-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-T121-35 | T8-C2-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-T121-92 | T8-C2-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-T121-93 | T8-C2-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-T121-65 | T8-C1-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-T121-66 | T8-C1-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | OEM-T121-5 | T8-C3-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W49 | OEM-T121-63 | T8-C3-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W50 | OEM-T121-25 | T8-C1-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W51 | OEM-T121-80 | T8-C3-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W52 | OEM-T121-104 | T8-C3-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W53 | OEM-T121-105 | T8-C3-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W54 | OEM-T121-115 | T8-C3-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W55 | OEM-T121-22 | T8-C3-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W56 | OEM-T121-47 | T8-C3-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W57 | OEM-T121-48 | T8-C3-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W58 | OEM-T121-64 | T8-C1-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W59 | OEM-T121-9 | T8-C1-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W60 | OEM-T121-51 | T8-C3-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W61 | OEM-T121-52 | T8-C3-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W62 | OEM-T121-70 | T8-C3-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W63 | OEM-T121-71 | T8-C3-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W64 | OEM-T121-68 | T8-C3-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W65 | OEM-T121-69 | T8-C3-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W66 | OEM-T121-85 | T8-C2-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W67 | OEM-T121-54 | T8-C2-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W68 | OEM-T121-28 | T8-C2-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W69 | OEM-T121-38 | T8-C2-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W70 | OEM-T121-39 | T8-C2-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W71 | OEM-T121-40 | T8-C2-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W72 | OEM-T121-41 | T8-C2-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W73 | OEM-T121-49 | T8-C2-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W74 | OEM-T121-55 | T8-C2-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W75 | OEM-T121-56 | T8-C2-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W76 | OEM-T121-57 | T8-C2-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W77 | OEM-T121-67 | T8-C2-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W78 | OEM-T121-75 | T8-C2-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W79 | OEM-T121-76 | T8-C2-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W80 | OEM-T121-60 | T8-C3-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W81 | OEM-T121-58 | T8-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 | T8-C1-13 | NEW-BATT-1 | open (OL) | power ground must not touch +12 V supply | |
| 2 | T8-C1-13 | T8-C1-31 | open (OL) | power ground must not touch +12 V supply | |
| 3 | T8-C1-13 | T8-C2-24 | open (OL) | power ground must not touch 5 V sensor reference | |
| 4 | T8-C1-13 | T8-C2-9 | open (OL) | power ground must not touch 5 V sensor reference | |
| 5 | T8-C1-13 | T8-C3-26 | open (OL) | power ground must not touch +12 V supply | |
| 6 | T8-C1-31 | T8-C2-24 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 7 | T8-C1-31 | T8-C2-9 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 8 | T8-C2-21 | NEW-BATT-1 | open (OL) | sensor ground must not touch +12 V supply | |
| 9 | T8-C2-21 | T8-C1-31 | open (OL) | sensor ground must not touch +12 V supply | |
| 10 | T8-C2-21 | T8-C2-24 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 11 | T8-C2-21 | T8-C2-9 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 12 | T8-C2-21 | T8-C3-26 | open (OL) | sensor ground must not touch +12 V supply | |
| 13 | T8-C2-24 | NEW-BATT-1 | open (OL) | 5 V sensor reference must not touch +12 V supply | |
| 14 | T8-C2-9 | NEW-BATT-1 | open (OL) | 5 V sensor reference must not touch +12 V supply | |
| 15 | T8-C3-26 | T8-C2-24 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 16 | T8-C3-26 | T8-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
NEW-BATT
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W5 | — | 1.25 | T8-C3-27 | — | — | — |
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) | — | W40 | — | 0.5 | T8-C2-1 | — | — | — |
| 102 | Ignition coil 1 (N127) | — | W29 | — | 0.5 | T8-C1-10 | — | — | — |
| 103 | Ignition coil 3 (N158) | — | W31 | — | 0.5 | T8-C1-1 | — | — | — |
| 104 | Boost control solenoid (N75) | — | W52 | — | 0.5 | T8-C3-23 | — | — | — |
| 105 | Diverter valve (N249) | — | W53 | — | 0.5 | T8-C3-24 | — | — | — |
| 106 | Knock sensor 1 (G61) | — | W27 | — | 0.5 | T8-C3-31 | — | — | — |
| 107 | Knock sensor 2 (G66) | — | W28 | — | 0.5 | T8-C3-32 | — | — | — |
| 108 | Sensor ground | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| 115 | VVT camshaft adjustment valve (N205) | — | W54 | — | 0.5 | T8-C3-25 | — | — | — |
| 117 | Throttle motor G186 (+) | — | W38 | — | 0.5 | T8-C1-6 | — | — | — |
| 118 | Throttle motor G186 (−) | — | W37 | — | 0.5 | T8-C1-7 | — | — | — |
| 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 | — | — | — |
| 22 | Brake vacuum pump (V192) | — | W55 | — | 0.5 | T8-C3-10 | — | — | — |
| 25 | V144 Evaporative diagnostic pump (Pin 2) | — | W50 | — | 0.5 | T8-C1-3 | — | — | — |
| 27 | MAF sensor supply (G70) | — | — | — | — | — | — | — | — |
| 28 | Alternator DF terminal (charge warning) | — | W68 | — | 0.5 | T8-C2-4 | — | — | — |
| 29 | MAF sensor ground (G70) | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| 3 | Ignition switch +12V (term 15) | — | — | — | — | — | — | — | — |
| 33 | Accelerator pedal position 1 (G79) | — | W41 | — | 0.5 | T8-C2-5 | — | — | — |
| 34 | Accelerator pedal position 1 ground (G79) | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 35 | Accelerator pedal position 2 (G185) | — | W43 | — | 0.5 | T8-C2-18 | — | — | — |
| 36 | Accelerator pedal position 2 ground (G185) | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 37 | Engine speed signal (tacho to cluster) | — | — | — | — | — | — | — | — |
| 38 | Cruise control switch (E45) | — | W69 | — | 0.5 | T8-C2-8 | — | — | — |
| 39 | Clutch pedal switch (F36) | — | W70 | — | 0.5 | T8-C2-11 | — | — | — |
| 40 | A/C signal | — | W71 | — | 0.5 | T8-C2-14 | — | — | — |
| 41 | A/C signal | — | W72 | — | 0.5 | T8-C2-15 | — | — | — |
| 43 | K-line diagnostics (OBD pin 7) | — | — | — | — | — | — | — | — |
| 47 | Check engine light (MIL) | — | W56 | — | 0.5 | T8-C3-4 | — | — | — |
| 48 | EPC warning light | — | W57 | — | 0.5 | T8-C3-28 | — | — | — |
| 49 | Power steering pressure switch (F88) | — | W73 | — | 0.5 | T8-C2-27 | — | — | — |
| 5 | Wideband lambda heater (Z19) | — | W48 | — | 0.5 | T8-C3-9 | — | — | — |
| 50 | Power steering pressure switch supply (F88) | — | — | — | — | — | — | — | — |
| 51 | Wideband lambda pump (G39) | — | W60 | — | 0.5 | T8-C3-7 | — | — | — |
| 52 | Wideband lambda pump (G39) | — | W61 | — | 0.5 | T8-C3-1 | — | — | — |
| 53 | MAF sensor signal (G70) | — | W39 | — | 0.5 | T8-C2-10 | — | — | — |
| 54 | Road speed signal (VSS) | — | W67 | — | 0.5 | T8-C2-2 | — | — | — |
| 55 | Brake pedal switch (F) | — | W74 | — | 0.5 | T8-C2-20 | — | — | — |
| 56 | Brake pedal switch (F) | — | W75 | — | 0.5 | T8-C2-31 | — | — | — |
| 57 | Cruise control switch (E45) | — | W76 | — | 0.5 | T8-C2-32 | — | — | — |
| 58 | CAN bus low | — | W81 | — | 0.5 | T8-C3-34 | — | — | — |
| 60 | CAN bus high | — | W80 | — | 0.5 | T8-C3-33 | — | — | — |
| 62 | Battery constant +12V (term 30) | — | W4 | — | 0.85 | T8-C3-26 | — | — | — |
| 63 | Post-cat lambda heater (Z29) | — | W49 | — | 0.5 | T8-C3-3 | — | — | — |
| 64 | EVAP canister valve (N80) | — | W58 | — | 0.5 | T8-C1-16 | — | — | — |
| 65 | Fuel pump relay control | — | W46 | — | 0.5 | T8-C1-5 | — | — | — |
| 66 | Secondary-air pump relay (J299) | — | W47 | — | 0.5 | T8-C1-4 | — | — | — |
| 67 | Crash sensor signal | — | W77 | — | 0.5 | T8-C2-34 | — | — | — |
| 68 | Post-cat lambda signal (G130) | — | W64 | — | 0.5 | T8-C3-17 | — | — | — |
| 69 | Post-cat lambda signal (G130) | — | W65 | — | 0.5 | T8-C3-18 | — | — | — |
| 70 | Wideband lambda Nernst signal (G39) | — | W62 | — | 0.5 | T8-C3-12 | — | — | — |
| 71 | Wideband lambda Nernst signal (G39) | — | W63 | — | 0.5 | T8-C3-6 | — | — | — |
| 72 | Accelerator pedal position 1 5V supply (G79) | — | W18 | — | 0.5 | SP-5V1-1 | — | — | — |
| 73 | Accelerator pedal position 2 5V supply (G185) | — | W21 | — | 0.5 | SP-5V2-1 | — | — | — |
| 75 | Cruise control switch (E45) | — | W78 | — | 0.5 | T8-C2-3 | — | — | — |
| 76 | Cruise control switch (E45) | — | W79 | — | 0.5 | T8-C2-16 | — | — | — |
| 80 | V144 Evap Diagnostic Pump (Pin 1) | — | W51 | — | 0.5 | T8-C3-22 | — | — | — |
| 82 | Crank position sensor (G28) | — | W25 | — | 0.5 | T8-C2-12 | — | — | — |
| 83 | Throttle position sensor 5V supply (G187/G188) | — | W22 | — | 0.5 | SP-5V2-1 | — | — | — |
| 84 | Throttle position sensor 1 (G187) | — | W42 | — | 0.5 | T8-C2-6 | — | — | — |
| 85 | Intake air temperature (G42) | — | W66 | — | 0.5 | T8-C2-25 | — | — | — |
| 86 | Camshaft position sensor (G40) | — | W26 | — | 0.5 | T8-C2-22 | — | — | — |
| 88 | Injector 4 (N33) | — | W36 | — | 0.5 | T8-C1-25 | — | — | — |
| 89 | Injector 2 (N31) | — | W34 | — | 0.5 | T8-C1-17 | — | — | — |
| 9 | Secondary-air injection valve (N112) | — | W59 | — | 0.5 | T8-C1-15 | — | — | — |
| 90 | Crank position sensor ground (G28) | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 91 | Throttle position sensor ground (G187/G188) | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 92 | Throttle position sensor 2 (G188) | — | W44 | — | 0.5 | T8-C2-19 | — | — | — |
| 93 | Engine coolant temperature (G62) | — | W45 | — | 0.5 | T8-C2-7 | — | — | — |
| 94 | Ignition coil 4 (N163) | — | W32 | — | 0.5 | T8-C1-26 | — | — | — |
| 95 | Ignition coil 2 (N128) | — | W30 | — | 0.5 | T8-C1-18 | — | — | — |
| 96 | Injector 1 (N30) | — | W33 | — | 0.5 | T8-C1-9 | — | — | — |
| 97 | Injector 3 (N32) | — | W35 | — | 0.5 | T8-C1-34 | — | — | — |
| 98 | Cam + boost sensor 5V supply (G40/G31) | — | W19 | — | 0.5 | SP-5V1-1 | — | — | — |
| 99 | Knock sensor 5V supply (G61/G66) | — | W23 | — | 0.5 | SP-5V2-1 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W10 | — | 0.5 | OEM-T121-108 | — | — | — |
| 1 | — | — | W11 | — | 0.5 | OEM-T121-29 | — | — | — |
| 1 | — | — | W12 | — | 0.5 | OEM-T121-34 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | OEM-T121-36 | — | — | — |
| 1 | — | — | W14 | — | 0.5 | OEM-T121-90 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | OEM-T121-91 | — | — | — |
| 1 | — | — | W16 | — | 0.5 | T8-C2-21 | — | — | — |
| 1 | — | — | W17 | — | 0.5 | T8-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 | T8-C1-31 | — | — | — |
SP-5V1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W18 | — | 0.5 | OEM-T121-72 | — | — | — |
| 1 | — | — | W19 | — | 0.5 | OEM-T121-98 | — | — | — |
| 1 | — | — | W20 | — | 0.5 | T8-C2-24 | — | — | — |
SP-5V2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W21 | — | 0.5 | OEM-T121-73 | — | — | — |
| 1 | — | — | W22 | — | 0.5 | OEM-T121-83 | — | — | — |
| 1 | — | — | W23 | — | 0.5 | OEM-T121-99 | — | — | — |
| 1 | — | — | W24 | — | 0.5 | T8-C2-9 | — | — | — |
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 | T8-C1-13 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | T8-C1-14 | — | — | — |
T8-C1
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Coil 3 | — | W31 | — | 0.5 | OEM-T121-103 | — | — | — |
| 2 | — | — | — | — | — | — | — | — | — |
| 3 | PWM 3 | — | W50 | — | 0.5 | OEM-T121-25 | — | — | — |
| 4 | PWM 2 | — | W47 | — | 0.5 | OEM-T121-66 | — | — | — |
| 5 | PWM 1 | — | W46 | — | 0.5 | OEM-T121-65 | — | — | — |
| 6 | Motor 1 + | — | W38 | — | 0.5 | OEM-T121-117 | — | — | — |
| 7 | Motor 1 - | — | W37 | — | 0.5 | OEM-T121-118 | — | — | — |
| 8 | — | — | — | — | — | — | — | — | — |
| 9 | Injector 1 | — | W33 | — | 0.5 | OEM-T121-96 | — | — | — |
| 10 | Coil 1 | — | W29 | — | 0.5 | OEM-T121-102 | — | — | — |
| 11 | Coil 5 | — | — | — | — | — | — | — | — |
| 12 | Coil 7 | — | — | — | — | — | — | — | — |
| 13 | Power Ground 1 | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 14 | Power Ground 2 | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| 15 | Injector 6 | — | W59 | — | 0.5 | OEM-T121-9 | — | — | — |
| 16 | Injector 5 | — | W58 | — | 0.5 | OEM-T121-64 | — | — | — |
| 17 | Injector 2 | — | W34 | — | 0.5 | OEM-T121-89 | — | — | — |
| 18 | Coil 2 | — | W30 | — | 0.5 | OEM-T121-95 | — | — | — |
| 19 | Coil 8 | — | — | — | — | — | — | — | — |
| 20 | — | — | — | — | — | — | — | — | — |
| 21 | — | — | — | — | — | — | — | — | — |
| 22 | — | — | — | — | — | — | — | — | — |
| 23 | Injector 8 | — | — | — | — | — | — | — | — |
| 24 | Injector 7 | — | — | — | — | — | — | — | — |
| 25 | Injector 4 | — | W36 | — | 0.5 | OEM-T121-88 | — | — | — |
| 26 | Coil 4 | — | W32 | — | 0.5 | OEM-T121-94 | — | — | — |
| 27 | Coil 6 | — | — | — | — | — | — | — | — |
| 28 | — | — | — | — | — | — | — | — | — |
| 29 | — | — | — | — | — | — | — | — | — |
| 30 | — | — | — | — | — | — | — | — | — |
| 31 | Ignition 12v In | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 32 | — | — | — | — | — | — | — | — | — |
| 33 | — | — | — | — | — | — | — | — | — |
| 34 | Injector 3 | — | W35 | — | 0.5 | OEM-T121-97 | — | — | — |
T8-C2
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Analogue 2 | — | W40 | — | 0.5 | OEM-T121-101 | — | — | — |
| 2 | Wheel 1 | — | W67 | — | 0.5 | OEM-T121-54 | — | — | — |
| 3 | Analogue 10 | — | W78 | — | 0.5 | OEM-T121-75 | — | — | — |
| 4 | Digital 1 | — | W68 | — | 0.5 | OEM-T121-28 | — | — | — |
| 5 | Analogue 3 | — | W41 | — | 0.5 | OEM-T121-33 | — | — | — |
| 6 | Analogue 4 | — | W42 | — | 0.5 | OEM-T121-84 | — | — | — |
| 7 | Thermistor 1 | — | W45 | — | 0.5 | OEM-T121-93 | — | — | — |
| 8 | Digital 2 | — | W69 | — | 0.5 | OEM-T121-38 | — | — | — |
| 9 | 5v Output | — | W24 | — | 0.5 | SP-5V2-1 | — | — | — |
| 10 | Analogue 1 | — | W39 | — | 0.5 | OEM-T121-53 | — | — | — |
| 11 | Digital 3 | — | W70 | — | 0.5 | OEM-T121-39 | — | — | — |
| 12 | Crank | — | W25 | — | 0.5 | OEM-T121-82 | — | — | — |
| 13 | Analogue 12 | — | — | — | — | — | — | — | — |
| 14 | Digital 4 | — | W71 | — | 0.5 | OEM-T121-40 | — | — | — |
| 15 | Digital 5 | — | W72 | — | 0.5 | OEM-T121-41 | — | — | — |
| 16 | Analogue 11 | — | W79 | — | 0.5 | OEM-T121-76 | — | — | — |
| 17 | Thermistor 3 | — | — | — | — | — | — | — | — |
| 18 | Analogue 5 | — | W43 | — | 0.5 | OEM-T121-35 | — | — | — |
| 19 | Analogue 6 | — | W44 | — | 0.5 | OEM-T121-92 | — | — | — |
| 20 | Wheel 2 | — | W74 | — | 0.5 | OEM-T121-55 | — | — | — |
| 21 | Sensor Ground | — | W16 | — | 0.5 | SP-0V-1 | — | — | — |
| 22 | Cam 1 | — | W26 | — | 0.5 | OEM-T121-86 | — | — | — |
| 23 | — | — | — | — | — | — | — | — | — |
| 24 | 5v Output | — | W20 | — | 0.5 | SP-5V1-1 | — | — | — |
| 25 | Thermistor 2 | — | W66 | — | 0.5 | OEM-T121-85 | — | — | — |
| 26 | CAN High | — | — | — | — | — | — | — | — |
| 27 | Digital 6 | — | W73 | — | 0.5 | OEM-T121-49 | — | — | — |
| 28 | CAN Low | — | — | — | — | — | — | — | — |
| 29 | Cam 2 | — | — | — | — | — | — | — | — |
| 30 | — | — | — | — | — | — | — | — | — |
| 31 | Wheel 3 | — | W75 | — | 0.5 | OEM-T121-56 | — | — | — |
| 32 | Wheel 4 | — | W76 | — | 0.5 | OEM-T121-57 | — | — | — |
| 33 | Sensor Ground | — | W17 | — | 0.5 | SP-0V-1 | — | — | — |
| 34 | Analogue 9 | — | W77 | — | 0.5 | OEM-T121-67 | — | — | — |
T8-C3
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Lambda 2 Pump Current | — | W61 | — | 0.5 | OEM-T121-52 | — | — | — |
| 2 | Lambda 2 VGND | — | — | — | — | — | — | — | — |
| 3 | Lambda 2 Heater Negative | — | W49 | — | 0.5 | OEM-T121-63 | — | — | — |
| 4 | PWM 9 | — | W56 | — | 0.5 | OEM-T121-47 | — | — | — |
| 5 | Lambda 2 Trim Resistor | — | — | — | — | — | — | — | — |
| 6 | Lambda 2 Nernst Voltage | — | W63 | — | 0.5 | OEM-T121-71 | — | — | — |
| 7 | Lambda 1 Pump Current | — | W60 | — | 0.5 | OEM-T121-51 | — | — | — |
| 8 | Lambda 1 VGND | — | — | — | — | — | — | — | — |
| 9 | Lambda 1 Heater Negative | — | W48 | — | 0.5 | OEM-T121-5 | — | — | — |
| 10 | PWM 8 | — | W55 | — | 0.5 | OEM-T121-22 | — | — | — |
| 11 | Lambda 1 Trim Resistor | — | — | — | — | — | — | — | — |
| 12 | Lambda 1 Nernst Voltage | — | W62 | — | 0.5 | OEM-T121-70 | — | — | — |
| 13 | — | — | — | — | — | — | — | — | — |
| 14 | — | — | — | — | — | — | — | — | — |
| 15 | — | — | — | — | — | — | — | — | — |
| 16 | — | — | — | — | — | — | — | — | — |
| 17 | Analogue 7 | — | W64 | — | 0.5 | OEM-T121-68 | — | — | — |
| 18 | Analogue 8 | — | W65 | — | 0.5 | OEM-T121-69 | — | — | — |
| 19 | — | — | — | — | — | — | — | — | — |
| 20 | — | — | — | — | — | — | — | — | — |
| 21 | — | — | — | — | — | — | — | — | — |
| 22 | PWM 4 | — | W51 | — | 0.5 | OEM-T121-80 | — | — | — |
| 23 | PWM 5 | — | W52 | — | 0.5 | OEM-T121-104 | — | — | — |
| 24 | PWM 6 | — | W53 | — | 0.5 | OEM-T121-105 | — | — | — |
| 25 | PWM 7 | — | W54 | — | 0.5 | OEM-T121-115 | — | — | — |
| 26 | Permanent 12v | — | W4 | — | 0.85 | OEM-T121-62 | — | — | — |
| 27 | Permanent 12v | — | W5 | — | 1.25 | NEW-BATT-1 | — | — | — |
| 28 | PWM 10 | — | W57 | — | 0.5 | OEM-T121-48 | — | — | — |
| 29 | — | — | — | — | — | — | — | — | — |
| 30 | — | — | — | — | — | — | — | — | — |
| 31 | Knock 1 | — | W27 | — | 0.5 | OEM-T121-106 | — | — | — |
| 32 | Knock 2 | — | W28 | — | 0.5 | OEM-T121-107 | — | — | — |
| 33 | CAN 2 High | — | W80 | — | 0.5 | OEM-T121-60 | — | — | — |
| 34 | CAN 2 Low | — | W81 | — | 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 | T8-C1-13 + T8-C1-14 | Power Ground 1 + Power Ground 2 | ground | corroborated | |
| OEM-T121-101 | Boost pressure sensor (G31) | analog_in | T8-C2-1 | Analogue 2 | analog_in | corroborated | |
| OEM-T121-102 | Ignition coil 1 (N127) | ignition_out | T8-C1-10 | Coil 1 | ignition_out | corroborated | |
| OEM-T121-103 | Ignition coil 3 (N158) | ignition_out | T8-C1-1 | Coil 3 | ignition_out | corroborated | |
| OEM-T121-104 | Boost control solenoid (N75) | low_side_out | T8-C3-23 | PWM 5 | low_side_out | corroborated | |
| OEM-T121-105 | Diverter valve (N249) | low_side_out | T8-C3-24 | PWM 6 | low_side_out | corroborated | |
| OEM-T121-106 | Knock sensor 1 (G61) | knock_in | T8-C3-31 | Knock 1 | knock_in | corroborated | |
| OEM-T121-107 | Knock sensor 2 (G66) | knock_in | T8-C3-32 | Knock 2 | knock_in | corroborated | |
| OEM-T121-108 | Sensor ground | sensor_ground | T8-C2-21 + T8-C2-33 | Sensor Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-T121-115 | VVT camshaft adjustment valve (N205) | low_side_out | T8-C3-25 | PWM 7 | low_side_out | corroborated | |
| OEM-T121-117 | Throttle motor G186 (+) | hbridge_out | T8-C1-6 | Motor 1 + | hbridge_out | corroborated | |
| OEM-T121-118 | Throttle motor G186 (−) | hbridge_out | T8-C1-7 | Motor 1 - | hbridge_out | corroborated | |
| OEM-T121-121 | ECM + coil power (J271 relay feed) | power_in | T8-C1-31 | Ignition 12v In | power_in | corroborated | |
| OEM-T121-2 | ECU ground | ground | T8-C1-13 + T8-C1-14 | Power Ground 1 + Power Ground 2 | ground | corroborated | |
| OEM-T121-21 | ECM power (J271 relay feed) | power_in | T8-C1-31 | Ignition 12v In | power_in | corroborated | |
| OEM-T121-22 | Brake vacuum pump (V192) | low_side_out | T8-C3-10 | PWM 8 | low_side_out | single_source | |
| OEM-T121-25 | V144 Evaporative diagnostic pump (Pin 2) | low_side_out | T8-C1-3 | PWM 3 | low_side_out | corroborated | |
| OEM-T121-27 | MAF sensor supply (G70) | power_in | — | — | — | corroborated | |
| OEM-T121-28 | Alternator DF terminal (charge warning) | digital_in | T8-C2-4 | Digital 1 | digital_in | single_source | |
| OEM-T121-29 | MAF sensor ground (G70) | sensor_ground | T8-C2-21 + T8-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 | T8-C2-5 | Analogue 3 | analog_in | corroborated | |
| OEM-T121-34 | Accelerator pedal position 1 ground (G79) | sensor_ground | T8-C2-21 + T8-C2-33 | Sensor Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-T121-35 | Accelerator pedal position 2 (G185) | analog_in | T8-C2-18 | Analogue 5 | analog_in | corroborated | |
| OEM-T121-36 | Accelerator pedal position 2 ground (G185) | sensor_ground | T8-C2-21 + T8-C2-33 | 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 | T8-C2-8 | Digital 2 | digital_in | single_source | |
| OEM-T121-39 | Clutch pedal switch (F36) | digital_in | T8-C2-11 | Digital 3 | digital_in | single_source | |
| OEM-T121-40 | A/C signal | digital_in | T8-C2-14 | Digital 4 | digital_in | single_source | |
| OEM-T121-41 | A/C signal | digital_in | T8-C2-15 | Digital 5 | 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 | T8-C3-4 | PWM 9 | low_side_out | corroborated | |
| OEM-T121-48 | EPC warning light | low_side_out | T8-C3-28 | PWM 10 | low_side_out | corroborated | |
| OEM-T121-49 | Power steering pressure switch (F88) | digital_in | T8-C2-27 | Digital 6 | digital_in | single_source | |
| OEM-T121-5 | Wideband lambda heater (Z19) | low_side_out | T8-C3-9 | Lambda 1 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 | T8-C3-7 | Lambda 1 Pump Current | wb_ip | corroborated | |
| OEM-T121-52 | Wideband lambda pump (G39) | wb_ip | T8-C3-1 | Lambda 2 Pump Current | wb_ip | corroborated | |
| OEM-T121-53 | MAF sensor signal (G70) | analog_in | T8-C2-10 | Analogue 1 | analog_in | corroborated | |
| OEM-T121-54 | Road speed signal (VSS) | digital_in | T8-C2-2 | Wheel 1 | digital_in | corroborated | |
| OEM-T121-55 | Brake pedal switch (F) | digital_in | T8-C2-20 | Wheel 2 | digital_in | single_source | |
| OEM-T121-56 | Brake pedal switch (F) | digital_in | T8-C2-31 | Wheel 3 | digital_in | single_source | |
| OEM-T121-57 | Cruise control switch (E45) | digital_in | T8-C2-32 | Wheel 4 | digital_in | single_source | |
| OEM-T121-58 | CAN bus low | can_l | T8-C3-34 | CAN 2 Low | can_l | corroborated | |
| OEM-T121-60 | CAN bus high | can_h | T8-C3-33 | CAN 2 High | can_h | corroborated | |
| OEM-T121-62 | Battery constant +12V (term 30) | power_in | T8-C3-26 | Permanent 12v | power_in | corroborated | |
| OEM-T121-63 | Post-cat lambda heater (Z29) | low_side_out | T8-C3-3 | Lambda 2 Heater Negative | low_side_out | corroborated | |
| OEM-T121-64 | EVAP canister valve (N80) | low_side_out | T8-C1-16 | Injector 5 | injector_out | corroborated | |
| OEM-T121-65 | Fuel pump relay control | low_side_out | T8-C1-5 | PWM 1 | low_side_out | corroborated | |
| OEM-T121-66 | Secondary-air pump relay (J299) | low_side_out | T8-C1-4 | PWM 2 | low_side_out | corroborated | |
| OEM-T121-67 | Crash sensor signal | digital_in | T8-C2-34 | Analogue 9 | analog_in | single_source | |
| OEM-T121-68 | Post-cat lambda signal (G130) | lambda_nb_in | T8-C3-17 | Analogue 7 | analog_in | corroborated | |
| OEM-T121-69 | Post-cat lambda signal (G130) | lambda_nb_in | T8-C3-18 | Analogue 8 | analog_in | corroborated | |
| OEM-T121-70 | Wideband lambda Nernst signal (G39) | wb_vs | T8-C3-12 | Lambda 1 Nernst Voltage | wb_vs | corroborated | |
| OEM-T121-71 | Wideband lambda Nernst signal (G39) | wb_vs | T8-C3-6 | Lambda 2 Nernst Voltage | wb_vs | corroborated | |
| OEM-T121-72 | Accelerator pedal position 1 5V supply (G79) | vref | T8-C2-24 | 5v Output | vref | corroborated | |
| OEM-T121-73 | Accelerator pedal position 2 5V supply (G185) | vref | T8-C2-9 | 5v Output | vref | corroborated | |
| OEM-T121-75 | Cruise control switch (E45) | digital_in | T8-C2-3 | Analogue 10 | analog_in | single_source | |
| OEM-T121-76 | Cruise control switch (E45) | digital_in | T8-C2-16 | Analogue 11 | analog_in | single_source | |
| OEM-T121-80 | V144 Evap Diagnostic Pump (Pin 1) | low_side_out | T8-C3-22 | PWM 4 | low_side_out | corroborated | |
| OEM-T121-82 | Crank position sensor (G28) | trigger_in | T8-C2-12 | Crank | trigger_in | corroborated | |
| OEM-T121-83 | Throttle position sensor 5V supply (G187/G188) | vref | T8-C2-9 | 5v Output | vref | corroborated | |
| OEM-T121-84 | Throttle position sensor 1 (G187) | analog_in | T8-C2-6 | Analogue 4 | analog_in | corroborated | |
| OEM-T121-85 | Intake air temperature (G42) | temp_in | T8-C2-25 | Thermistor 2 | temp_in | corroborated | |
| OEM-T121-86 | Camshaft position sensor (G40) | trigger_in | T8-C2-22 | Cam 1 | trigger_in | corroborated | |
| OEM-T121-88 | Injector 4 (N33) | injector_out | T8-C1-25 | Injector 4 | injector_out | corroborated | |
| OEM-T121-89 | Injector 2 (N31) | injector_out | T8-C1-17 | Injector 2 | injector_out | corroborated | |
| OEM-T121-9 | Secondary-air injection valve (N112) | low_side_out | T8-C1-15 | Injector 6 | injector_out | corroborated | |
| OEM-T121-90 | Crank position sensor ground (G28) | sensor_ground | T8-C2-21 + T8-C2-33 | Sensor Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-T121-91 | Throttle position sensor ground (G187/G188) | sensor_ground | T8-C2-21 + T8-C2-33 | Sensor Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-T121-92 | Throttle position sensor 2 (G188) | analog_in | T8-C2-19 | Analogue 6 | analog_in | corroborated | |
| OEM-T121-93 | Engine coolant temperature (G62) | temp_in | T8-C2-7 | Thermistor 1 | temp_in | corroborated | |
| OEM-T121-94 | Ignition coil 4 (N163) | ignition_out | T8-C1-26 | Coil 4 | ignition_out | corroborated | |
| OEM-T121-95 | Ignition coil 2 (N128) | ignition_out | T8-C1-18 | Coil 2 | ignition_out | corroborated | |
| OEM-T121-96 | Injector 1 (N30) | injector_out | T8-C1-9 | Injector 1 | injector_out | corroborated | |
| OEM-T121-97 | Injector 3 (N32) | injector_out | T8-C1-34 | Injector 3 | injector_out | corroborated | |
| OEM-T121-98 | Cam + boost sensor 5V supply (G40/G31) | vref | T8-C2-24 | 5v Output | vref | corroborated | |
| OEM-T121-99 | Knock sensor 5V supply (G61/G66) | vref | T8-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 | T8-C1-31 | 0.85 | no route | Ignition 12v In | — | |
| W4 | OEM-T121-62 | T8-C3-26 | 0.85 | no route | Battery constant +12V (term 30) | — | |
| W5 | NEW-BATT-1 | T8-C3-27 | 1.25 | no route | Permanent 12v | — | |
| 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 | T8-C1-13 | 0.85 | no route | Power Ground 1 | — | |
| W9 | SP-GND-1 | T8-C1-14 | 0.85 | no route | Power Ground 2 | — | |
| W10 | OEM-T121-108 | SP-0V-1 | 0.5 | no route | Sensor ground | — | |
| W11 | OEM-T121-29 | SP-0V-1 | 0.5 | no route | MAF sensor ground (G70) | — | |
| W12 | OEM-T121-34 | SP-0V-1 | 0.5 | no route | Accelerator pedal position 1 ground (G79) | — | |
| W13 | OEM-T121-36 | SP-0V-1 | 0.5 | no route | Accelerator pedal position 2 ground (G185) | — | |
| W14 | OEM-T121-90 | SP-0V-1 | 0.5 | no route | Crank position sensor ground (G28) | — | |
| W15 | OEM-T121-91 | SP-0V-1 | 0.5 | no route | Throttle position sensor ground (G187/G188) | — | |
| W16 | SP-0V-1 | T8-C2-21 | 0.5 | no route | Sensor Ground | — | |
| W17 | SP-0V-1 | T8-C2-33 | 0.5 | no route | Sensor Ground | — | |
| W18 | OEM-T121-72 | SP-5V1-1 | 0.5 | no route | Accelerator pedal position 1 5V supply (G79) | — | |
| W19 | OEM-T121-98 | SP-5V1-1 | 0.5 | no route | Cam + boost sensor 5V supply (G40/G31) | — | |
| W20 | SP-5V1-1 | T8-C2-24 | 0.5 | no route | 5v Output | — | |
| W21 | OEM-T121-73 | SP-5V2-1 | 0.5 | no route | Accelerator pedal position 2 5V supply (G185) | — | |
| W22 | OEM-T121-83 | SP-5V2-1 | 0.5 | no route | Throttle position sensor 5V supply (G187/G188) | — | |
| W23 | OEM-T121-99 | SP-5V2-1 | 0.5 | no route | Knock sensor 5V supply (G61/G66) | — | |
| W24 | SP-5V2-1 | T8-C2-9 | 0.5 | no route | 5v Output | — | |
| W25 | OEM-T121-82 | T8-C2-12 | 0.5 | no route | Crank position sensor (G28) | — | |
| W26 | OEM-T121-86 | T8-C2-22 | 0.5 | no route | Camshaft position sensor (G40) | — | |
| W27 | OEM-T121-106 | T8-C3-31 | 0.5 | no route | Knock sensor 1 (G61) | — | |
| W28 | OEM-T121-107 | T8-C3-32 | 0.5 | no route | Knock sensor 2 (G66) | — | |
| W29 | OEM-T121-102 | T8-C1-10 | 0.5 | no route | Ignition coil 1 (N127) | — | |
| W30 | OEM-T121-95 | T8-C1-18 | 0.5 | no route | Ignition coil 2 (N128) | — | |
| W31 | OEM-T121-103 | T8-C1-1 | 0.5 | no route | Ignition coil 3 (N158) | — | |
| W32 | OEM-T121-94 | T8-C1-26 | 0.5 | no route | Ignition coil 4 (N163) | — | |
| W33 | OEM-T121-96 | T8-C1-9 | 0.5 | no route | Injector 1 (N30) | — | |
| W34 | OEM-T121-89 | T8-C1-17 | 0.5 | no route | Injector 2 (N31) | — | |
| W35 | OEM-T121-97 | T8-C1-34 | 0.5 | no route | Injector 3 (N32) | — | |
| W36 | OEM-T121-88 | T8-C1-25 | 0.5 | no route | Injector 4 (N33) | — | |
| W37 | OEM-T121-118 | T8-C1-7 | 0.5 | no route | Throttle motor G186 (−) | — | |
| W38 | OEM-T121-117 | T8-C1-6 | 0.5 | no route | Throttle motor G186 (+) | — | |
| W39 | OEM-T121-53 | T8-C2-10 | 0.5 | no route | MAF sensor signal (G70) | — | |
| W40 | OEM-T121-101 | T8-C2-1 | 0.5 | no route | Boost pressure sensor (G31) | — | |
| W41 | OEM-T121-33 | T8-C2-5 | 0.5 | no route | Accelerator pedal position 1 (G79) | — | |
| W42 | OEM-T121-84 | T8-C2-6 | 0.5 | no route | Throttle position sensor 1 (G187) | — | |
| W43 | OEM-T121-35 | T8-C2-18 | 0.5 | no route | Accelerator pedal position 2 (G185) | — | |
| W44 | OEM-T121-92 | T8-C2-19 | 0.5 | no route | Throttle position sensor 2 (G188) | — | |
| W45 | OEM-T121-93 | T8-C2-7 | 0.5 | no route | Engine coolant temperature (G62) | — | |
| W46 | OEM-T121-65 | T8-C1-5 | 0.5 | no route | Fuel pump relay control | — | |
| W47 | OEM-T121-66 | T8-C1-4 | 0.5 | no route | Secondary-air pump relay (J299) | — | |
| W48 | OEM-T121-5 | T8-C3-9 | 0.5 | no route | Wideband lambda heater (Z19) | — | |
| W49 | OEM-T121-63 | T8-C3-3 | 0.5 | no route | Post-cat lambda heater (Z29) | — | |
| W50 | OEM-T121-25 | T8-C1-3 | 0.5 | no route | V144 Evaporative diagnostic pump (Pin 2) | — | |
| W51 | OEM-T121-80 | T8-C3-22 | 0.5 | no route | V144 Evap Diagnostic Pump (Pin 1) | — | |
| W52 | OEM-T121-104 | T8-C3-23 | 0.5 | no route | Boost control solenoid (N75) | — | |
| W53 | OEM-T121-105 | T8-C3-24 | 0.5 | no route | Diverter valve (N249) | — | |
| W54 | OEM-T121-115 | T8-C3-25 | 0.5 | no route | VVT camshaft adjustment valve (N205) | — | |
| W55 | OEM-T121-22 | T8-C3-10 | 0.5 | no route | Brake vacuum pump (V192) | — | |
| W56 | OEM-T121-47 | T8-C3-4 | 0.5 | no route | Check engine light (MIL) | — | |
| W57 | OEM-T121-48 | T8-C3-28 | 0.5 | no route | EPC warning light | — | |
| W58 | OEM-T121-64 | T8-C1-16 | 0.5 | no route | EVAP canister valve (N80) | — | |
| W59 | OEM-T121-9 | T8-C1-15 | 0.5 | no route | Secondary-air injection valve (N112) | — | |
| W60 | OEM-T121-51 | T8-C3-7 | 0.5 | no route | Wideband lambda pump (G39) | — | |
| W61 | OEM-T121-52 | T8-C3-1 | 0.5 | no route | Wideband lambda pump (G39) | — | |
| W62 | OEM-T121-70 | T8-C3-12 | 0.5 | no route | Wideband lambda Nernst signal (G39) | — | |
| W63 | OEM-T121-71 | T8-C3-6 | 0.5 | no route | Wideband lambda Nernst signal (G39) | — | |
| W64 | OEM-T121-68 | T8-C3-17 | 0.5 | no route | Post-cat lambda signal (G130) | — | |
| W65 | OEM-T121-69 | T8-C3-18 | 0.5 | no route | Post-cat lambda signal (G130) | — | |
| W66 | OEM-T121-85 | T8-C2-25 | 0.5 | no route | Intake air temperature (G42) | — | |
| W67 | OEM-T121-54 | T8-C2-2 | 0.5 | no route | Road speed signal (VSS) | — | |
| W68 | OEM-T121-28 | T8-C2-4 | 0.5 | no route | Alternator DF terminal (charge warning) | — | |
| W69 | OEM-T121-38 | T8-C2-8 | 0.5 | no route | Cruise control switch (E45) | — | |
| W70 | OEM-T121-39 | T8-C2-11 | 0.5 | no route | Clutch pedal switch (F36) | — | |
| W71 | OEM-T121-40 | T8-C2-14 | 0.5 | no route | A/C signal | — | |
| W72 | OEM-T121-41 | T8-C2-15 | 0.5 | no route | A/C signal | — | |
| W73 | OEM-T121-49 | T8-C2-27 | 0.5 | no route | Power steering pressure switch (F88) | — | |
| W74 | OEM-T121-55 | T8-C2-20 | 0.5 | no route | Brake pedal switch (F) | — | |
| W75 | OEM-T121-56 | T8-C2-31 | 0.5 | no route | Brake pedal switch (F) | — | |
| W76 | OEM-T121-57 | T8-C2-32 | 0.5 | no route | Cruise control switch (E45) | — | |
| W77 | OEM-T121-67 | T8-C2-34 | 0.5 | no route | Crash sensor signal | — | |
| W78 | OEM-T121-75 | T8-C2-3 | 0.5 | no route | Cruise control switch (E45) | — | |
| W79 | OEM-T121-76 | T8-C2-16 | 0.5 | no route | Cruise control switch (E45) | — | |
| W80 | OEM-T121-60 | T8-C3-33 | 0.5 | no route | CAN bus high | — | |
| W81 | OEM-T121-58 | T8-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) | 66.000 | ea |
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| No configured channels. | |||||||
Findings
Open (15)
| Severity | Code | Subject | Message |
|---|---|---|---|
| warn | DATASET_GAP | T8+ C1 | 10 of 34 cavities on T8+ C1 have no pin data (2,8,20,21,22,28,29,30,32,33). Anything there is invisible to these checks. |
| warn | DATASET_GAP | T8+ C2 | 2 of 34 cavities on T8+ C2 have no pin data (23,30). Anything there is invisible to these checks. |
| warn | DATASET_GAP | T8+ C3 | 9 of 34 cavities on T8+ C3 have no pin data (13,14,15,16,19,20,21,29,30). Anything there is invisible to these checks. |
| warn | DBW_MOTOR_CURRENT | T8-C1-6 | Cannot confirm T8+ can drive the throttle motor: neither the motor stall current (OEM-T121-117) nor the peak rating of T8-C1-6 "Motor 1 +" is known. |
| warn | DBW_MOTOR_CURRENT | T8-C1-7 | Cannot confirm T8+ can drive the throttle motor: neither the motor stall current (OEM-T121-118) nor the peak rating of T8-C1-7 "Motor 1 -" is known. |
| warn | DBW_SHARED_5V | OEM-T121-72 + OEM-T121-98 + SP-5V1-1 + T8-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 (T8-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. T8+ 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 + T8-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 (T8-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. T8+ 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 | NET_FAMILY | OEM-T121-67 ↔ T8-C2-34 | OEM-T121-67 "Crash sensor signal" [digital_in] is wired to T8-C2-34 "Analogue 9" [analog_in]. Analog and digital on one net. A switch on an analog input works with a pull-up and a threshold; an analog sensor on a digital input loses its value. |
| warn | NET_FAMILY | OEM-T121-75 ↔ T8-C2-3 | OEM-T121-75 "Cruise control switch (E45)" [digital_in] is wired to T8-C2-3 "Analogue 10" [analog_in]. Analog and digital on one net. A switch on an analog input works with a pull-up and a threshold; an analog sensor on a digital input loses its value. |
| warn | NET_FAMILY | OEM-T121-76 ↔ T8-C2-16 | OEM-T121-76 "Cruise control switch (E45)" [digital_in] is wired to T8-C2-16 "Analogue 11" [analog_in]. Analog and digital on one net. A switch on an analog input works with a pull-up and a threshold; an analog sensor on a digital input loses its value. |
| warn | SUPPLY_GROUP | OEM-T121-72 + OEM-T121-98 + SP-5V1-1 + T8-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 + T8-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-T121-64 ↔ T8-C1-16 | OEM-T121-64 "EVAP canister valve (N80)" [low_side_out] is wired to T8-C1-16 "Injector 5" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-T121-9 ↔ T8-C1-15 | OEM-T121-9 "Secondary-air injection valve (N112)" [low_side_out] is wired to T8-C1-15 "Injector 6" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | UNMAPPED | OEM | 4 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); OEM-T121-50 Power steering pressure switch supply (F88) |
Accepted (0)
| Code | Subject | Reason | By |
|---|
Notes
Auto-mapped by auto_map() from the library pin data on 2026-10-23. Review every wire against both manuals before building. 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 37: Engine speed signal (tacho to cluster): no free tacho/frequency_out/low_side/ls_hs on DTAFast T8+ - OEM-T121 43: K-line diagnostics (OBD pin 7): no free k_line on DTAFast T8+ - 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 T8+ ECU wiring diagram | https://cdn.shopify.com/s/files/1/0848/7508/4108/files/T8PLUS_Wiring-Diagram.pdf?v=1728572013 | — | — | — |
| 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 | — | — | — |