Clean all areas of the ECU that you desoldered with flux to ensure no loose solder is left on the board or in the way of your desoldered holes. If your ECU does not have the area labeled R54 directly above the 28 hole area marked 27C256, then simply disreguard this step. On most boards there will be two solder joints labeled R54. You can leave the solder joint that is furthest from the ECU connectors filled as it will not be used. You will notice the CN2 section on the board has 5 holes. Using a desoldering tool or desoldering braid, desolder the 28 solder joints marked 27c256, the 24 joints marked 74hc373, and the four holes on the space labeled CN2. Now that the board is removed we can begin with the fun part.
HOW TO INSTALL HONDATA S300 FREE
Take extra care not to damage the ECU board or it’s connectors if the board takes a little extra persuasion to free from the case. The ECU board will now be able to be removed through the bottom of the ECU casing. Turn your computer upside down and remove all of the screws that hold the circuit board to the ECU case and take note how these are slightly different from the screws for the ECU covers. Completely remove this screw and the small metal retainer that it holds on the inside of the ECU case and set these aside. On the side of the ECU where the wire harness plugs are you will see a small phillips head screw. Unscrew both top and bottom lids from your ECU and set both covers aside. If you are going to be using a P06, Pr4, or P75 ECU, you must also perform a non-vtec to vtec ECU conversion with the Hondata S300 installation to properly operate a VTEC engine. It is assumed that any non-vtec ECU will only be used in non-vtec applications.
The accepted Honda ECU’s to use with the S300 are: P06, PR4, P28, P30, P61, P72, and P75. This install guide applies to the USDM variant only. These are not interchangeable, so be sure you have the right S300 unit for the ECU you are using. Hondata part number S300J is designed for the JDM (Japan market) square case OBD1 Civic / Integra style ECU’s. The Hondata S300 (part number S300) is designed for the US market (USDM) rectangle or ‘large case’ OBD1 Civic / Integra style ECU’s. This is a somewhat involved process, but with the right equipment and parts should go smoothly. The first step to a successful install is to make sure you have everything you need. However, with this step by step tutorial, you can now successfully install your Hondata S300 into your OBD1 ECU yourself!
It is up to you to arrange to have it installed. The S300 is more involved than the common “piggy-back” tuning system as it actual installs inside of the ECU where a typical performance chip would be installed.Īnother drawback to the system is that when purchasing the S300 you are buying just the Hondata unit and software. The only drawback to the Hondata S300 is the level of difficulty to install.
HOW TO INSTALL HONDATA S300 SERIES
The S300 has the capability to operate any VTEC or Non-VTEC D, B, F, or H series Honda Engine, and its advanced boost control capabilities make it one of the most versatile Honda tuning systems around. The Hondata S300 is one of the most advanced OBD1 Honda tuning systems available on the market.
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