This covers the Honda JDM “P72“, “P30” and “P08“.

Installing a performance chip on 1992-1995 Honda JDM computers uses the same method as described on other posts on this website. You may use the search function above for those other publications. What differentiate the installation on JDM ecus from USDM, Canadian, European, Australian and some others, is the need of installing Surface-Mount-Devices (SMD’s). The same installation kit of the P28 and other OBD-I Civic / Integra ecus is needed, but the parts are smaller. These parts are; the 74HC373 chip, the “J1″ jumper and the two bypass capacitors, which instead of being a through-hole mounting devices, these are soldered on the surface of the circuit board. They are smaller and a little bit more difficult than their counter parts, but still, it is a simple job. The resistor “R54″ is not needed on this installation and the two capacitors are optional, so the jumper and 74HC373 latch chip will be depicted only.

Here is a picture of the 74HC373 SMD Chip

Note: This job requires average skills on electronics soldering, but it doesn’t require skills on electronics. You may always bring the computer and the new chip to any TV or electronics shop so they can install the chip and the other parts, then you just install back the computer in your car. Also, all connections should be verified before and after soldering the socket. Take care not to jump connections with soldering or brake circuit traces by over heating. Notice that there are connections above, bellow and inside the circuit board that are sensitive to too much heat. Always clean the finished job with a mild solvent like alcohol

This installation is needed only once. After that, it will be a matter of pulling out one chip and inserting any other if you would like to switch between different tunings or for comparisons. Whenever you wish to go back to stock mode, please do not uninstall anything. Just cut or remove jumper “J1″. Installing back that jumper will switch to performance mode again, as long as the chip is inserted.

Your computer is located at the passenger’s side kick panel or lower dash. After locating the computer in your vehicle, remove the bolts that attach the computer to its place and carefully disconnect the harnesses that are plugged to its back. The harnesses can be disconnected by pushing a clip, located on top of the plastic connectors and pulling it back carefully. After uninstalling the ecu, put it in a flat table and remove the bolts securing both top and bottom covers using a #2 Phillips screwdriver. Remove the bolts that fixes the small board on the top of the main board and CAREFULLY flip it back, taking care not brake the flexible cable ribbon attached to it.

(Click on image to enlarge)

For installing the chip, you will need to locate the footprints on the circuit board where the parts to be installed belong (See picture above). In regular cases, there will be no parts installed in the targeted spots, just the footprints. You will only need to clean the spots (remove the solder) and then solder in place the corresponding parts. First, solder in place the 28-Pin socket and the 74HC373 small chip (SMD – Surface Mount Device).

After that, flip over the ecu and locate the spot of the “J1″ jumper on that side of the circuit board. Just jump it with a small piece of wire or with a zero-ohm surface-mount resistor. The best is a low height arc shaped jumper made with a piece of wire, so it can be cut / joined for switching between stock and performance modes. If you decide to put a switch on the ecu wall or cover, it is ok, but keep wires short. Check picture below for location of “J1″.

Now, insert the performance chip on the 28-Pin socket. Please use the drawings above and below as reference, to make sure you are installing the chips the right way in the socket, since they will fit both ways, but will only work in the right one.

Now you are ready to put back together your ecu and reinstall it in your NEW car !!!

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