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.
Components
| Ref | Kind | Part | Exclude from BOM |
|---|---|---|---|
| OEM-T121 | connector | ||
| SP-0V | splice | ||
| SP-14V | splice | ||
| SP-5V1 | splice | ||
| SP-GND | splice | ||
| T2I-C1 | connector |
Create part
Cut list
Lengths need a layout (0 of 44 routed).
| Wire | From / To | Gauge | Signal |
|---|---|---|---|
| W1 | OEM-T121-121 / SP-14V-1 | 0.85 | ECM + coil power (J271 relay feed) |
| W2 | OEM-T121-21 / SP-14V-1 | 0.85 | ECM power (J271 relay feed) |
| W3 | SP-14V-1 / T2I-C1-31 | 0.85 | Ignition 12v In |
| W4 | OEM-T121-62 / T2I-C1-21 | 0.85 | Battery constant +12V (term 30) |
| W5 | OEM-T121-1 / SP-GND-1 | 0.85 | ECU ground |
| W6 | OEM-T121-2 / SP-GND-1 | 0.85 | ECU ground |
| W7 | SP-GND-1 / T2I-C1-13 | 0.85 | Power Ground 1 |
| W8 | SP-GND-1 / T2I-C1-14 | 0.85 | Power Ground 2 |
| W9 | OEM-T121-108 / SP-0V-1 | 0.5 | Sensor ground |
| W10 | OEM-T121-29 / SP-0V-1 | 0.5 | MAF sensor ground (G70) |
| W11 | OEM-T121-34 / SP-0V-1 | 0.5 | Accelerator pedal position 1 ground (G79) |
| W12 | OEM-T121-36 / SP-0V-1 | 0.5 | Accelerator pedal position 2 ground (G185) |
| W13 | OEM-T121-90 / SP-0V-1 | 0.5 | Crank position sensor ground (G28) |
| W14 | OEM-T121-91 / SP-0V-1 | 0.5 | Throttle position sensor ground (G187/G188) |
| W15 | SP-0V-1 / T2I-C1-28 | 0.5 | Sensor Ground |
| W16 | SP-0V-1 / T2I-C1-29 | 0.5 | Sensor Ground |
| W17 | OEM-T121-72 / SP-5V1-1 | 0.5 | Accelerator pedal position 1 5V supply (G79) |
| W18 | OEM-T121-73 / SP-5V1-1 | 0.5 | Accelerator pedal position 2 5V supply (G185) |
| W19 | OEM-T121-83 / SP-5V1-1 | 0.5 | Throttle position sensor 5V supply (G187/G188) |
| W20 | OEM-T121-98 / SP-5V1-1 | 0.5 | Cam + boost sensor 5V supply (G40/G31) |
| W21 | OEM-T121-99 / SP-5V1-1 | 0.5 | Knock sensor 5V supply (G61/G66) |
| W22 | SP-5V1-1 / T2I-C1-27 | 0.5 | 5v Output |
| W23 | OEM-T121-82 / T2I-C1-19 | 0.5 | Crank position sensor (G28) |
| W24 | OEM-T121-86 / T2I-C1-12 | 0.5 | Camshaft position sensor (G40) |
| W25 | OEM-T121-102 / T2I-C1-3 | 0.5 | Ignition coil 1 (N127) |
| W26 | OEM-T121-95 / T2I-C1-6 | 0.5 | Ignition coil 2 (N128) |
| W27 | OEM-T121-53 / T2I-C1-20 | 0.5 | MAF sensor signal (G70) |
| W28 | OEM-T121-101 / T2I-C1-22 | 0.5 | Boost pressure sensor (G31) |
| W29 | OEM-T121-33 / T2I-C1-23 | 0.5 | Accelerator pedal position 1 (G79) |
| W30 | OEM-T121-84 / T2I-C1-25 | 0.5 | Throttle position sensor 1 (G187) |
| W31 | OEM-T121-35 / T2I-C1-33 | 0.5 | Accelerator pedal position 2 (G185) |
| W32 | OEM-T121-92 / T2I-C1-34 | 0.5 | Throttle position sensor 2 (G188) |
| W33 | OEM-T121-93 / T2I-C1-24 | 0.5 | Engine coolant temperature (G62) |
| W34 | OEM-T121-65 / T2I-C1-1 | 0.5 | Fuel pump relay control |
| W35 | OEM-T121-66 / T2I-C1-10 | 0.5 | Secondary-air pump relay (J299) |
| W36 | OEM-T121-5 / T2I-C1-15 | 0.5 | Wideband lambda heater (Z19) |
| W37 | OEM-T121-63 / T2I-C1-18 | 0.5 | Post-cat lambda heater (Z29) |
| W38 | OEM-T121-104 / T2I-C1-26 | 0.5 | Boost control solenoid (N75) |
| W39 | OEM-T121-51 / T2I-C1-5 | 0.5 | Wideband lambda pump (G39) |
| W40 | OEM-T121-70 / T2I-C1-2 | 0.5 | Wideband lambda Nernst signal (G39) |
| W41 | OEM-T121-85 / T2I-C1-32 | 0.5 | Intake air temperature (G42) |
| W42 | OEM-T121-54 / T2I-C1-11 | 0.5 | Road speed signal (VSS) |
| W43 | OEM-T121-60 / T2I-C1-16 | 0.5 | CAN bus high |
| W44 | OEM-T121-58 / T2I-C1-17 | 0.5 | CAN bus low |
Bill of materials
No wire parts assigned: 44 wires need a wire part.
| Part number | Manufacturer | Description | Qty | Unit | Unit price | Buy |
|---|---|---|---|---|---|---|
| connector1 line | ||||||
| 4-1437290-0 | TE | Superseal 1.0 34-way plug, Key 1 | 1 | ea | 3 Way ComponentsKSV Looms (kit)TE Connectivity | |
| terminal1 line | ||||||
| 3-1447221-4 | TE | Superseal 1.0 socket terminal, 20 AWG (0.5 sq mm) | 29 | ea | TE Connectivity | |