MY 2001 - 2002 ECU Pinouts for the 2001 - 2002 Impreza RS

MY 2001-2003 RS ECU Pinouts for the 2001 to 2003 Impreza RS (Three Pages)

MY 2001 2.5 Forester SOHC ECU Pinouts ECU Pinouts for the 20012.5L Forester NA SOHC engine

MY 2002-2003 DOHC ECU Pinouts ECU Pinouts for the US Specification 2002-2003 WRX

MY 2004 SOHC ECU Pinouts ECU Pinouts for the US Specification 2004 Impreza RS

MY 2004 DOHC ECU Pinouts ECU Pinouts for the US Specification 2004 WRX
MY 2004 SOHC ECU Legacy Pinouts

MY 2005 2.5 Impreza SOHC ECU Pinouts ECU pinouts for the 2005 2.5L NA SOHC engine

MY 2005 2.5 Forester SOHC ECU Pinouts ECU pinouts for the 2005 2.5L Forester NA SOHC engine

MY 2005 2.5 Legacy GT DOHC ECU Pinouts ECU pinouts for the 2005 2.5L Legacy GT DOHC engine

MY 2005 2.5 WRX DOHC ECU Pinouts ECU pinouts for the 2005 2.5L WRX DOHC engine

MY 2005 2.5 STi DOHC ECU Pinouts ECU pinouts for the 2005 2.5L STi DOHC engine

Variety of ECU Pinouts
ECU pinouts for Legacy, Forester, Impreza
ECU pinouts for Legacy NA - Turbo Models
ECU pinouts for EJ20 - Turbo Models

How can I limit the risk of something going wrong when tuning?

Make sure your computer is running well, does not have a tendency to lock up or shut down, and is virus and spyware free. When tuning, make sure the laptop is plugged in and not just running on the battery. Turn off any power saving functions, especially those that shut down the hard drive, enter standby/hibernation or “speed step” the processor speed to a lower level (if possible). Close out all other programs except for the tuning software before starting. Make sure any firewall software does not interfere with the tuning software.

Make sure your car’s battery, charging and electrical system is working properly.

Make sure the tuning software cable is securely connected and not in a position that can be yanked out easily.

Always check for and use the latest version of the tuning software, as well as the latest ECU definitions and approved pinout for your car. Do not assume anything is correct without confirming.

Do not edit a table if you are not 100% sure what it does.

Always keep a back-up copy of your original ROM in a safe place.

When tuning, small changes each flash is better. Always study the effects of the changes on your car. In addition, you must have, at a minimum, a boost gauge and a wideband oxygen sensor.

Do not flash your ROM if the tuning software gives you any error message, this could mean there is an error/corruption in the ECU communication. If this is the case, it can save the wrong values in that particular table, which may occur whether you specifically edited the table in question or not.

After editing, save the ROM, close out the tuning software and then reopen the tuning software and your saved ROM. Make sure the changes were actually made. Also, triple check the values you edited to make sure they are exactly what you intended them to be.

Do not rely solely on the table help text in the tuning software to tune your car as they are simply an overview of the function of the table and not a detailed explanation. Make sure that you understand the impact of changing the data in a particular table and how all your changes will interact with one another.

I know nothing about tuning. It is safe for me to experiment on my own car?

No. Changes that seem small and insignificant to someone who doesn’t know what they are doing can actually result in a blown motor or unpredictable behavior on the road. You must seek out a professional tuner, with tuning experience for your car.

"Tuning is not for beginners setting out to experiment.

Even seemingly small changes by a novice can result in a blown engine."