We break down the relevant STI ECU Pinout for the 2005 Subaru WRX STI, and show you what wires you will need if you are swapping, repairing or working on your vehicle.
We’ll be going over the STI ECU Pinout for the 2005 Subaru WRX STI, found in the Second Generation Impreza. The EJ25 is a terrific powerplant, and excels at bolt on performance and even in a motor swap candidate role.
2005 Subaru WRX STI
POWER AND RELAYS
| Wire # | Name | Signal |
| B 5 | Control Unit Power Supply | Power |
| B 6 | Control Unit Power Supply | Power Relay |
| C 16 | Sensor Power Supply | Power |
ENGINE INPUTS
| Pin # | Name | Signal Type |
| B 26 | Vehicle Speed Sensor | Speed |
| C 29 | Throttle Sensor Output SUB | 1-4 volts |
| C 22 | Manifold Absolute Pressure Signal | 0-5 volts |
| C 18 | Throttle Sensor Output | 0-3 volts |
ENGINE VITALS
| Pin # | Name | Signal Type |
| C 25 | Knock Sensor | +0 Value |
| C 13 | Air Intake Temperature | +0 Value |
| A 14 | Engine Speed | 0-13 |
ENGINE SWAP ESSENTIALS
| Pin # | Name | Signal Type |
| A 33 | Front 02 | 2.8-3.2 |
| D 7 | Injector Ground | Ground |
| B 12 | Ignition Ground | Ground |
| D 1 and 2 | ECU Ground | Ground |
| B 1 and 4 | Ground | Ground |
| A 1 | Clutch Switch | Analog |
Need more information on the STI ECU Pinout in your Subaru? leave us a comment below and ask your question, and we’ll be more than happy to help you with your STI ECU Pinout.
EDIT – 2008 Subaru STI VCD PINOUT Diagram as requested by user Lecomte.
