1992 – 1995 JDM Honda Computers Performance Chip Installation



This covers installing a chip in the 1992-1995 Honda JDM ECUs, “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 about non-JDM ECUs. You may use the search function above for finding the other publications.

The difference on installations on JDM ECUs compared with USDM, Canadian, European, Australian and some other non JDM ECUs, is the need of installing surface-mount-devices (SMD’s) in the JDM versions. The same installation kit of the P28 and any other OBD-I Civic / Integra ECUs is needed, but the parts are smaller. These parts are; the 74HC373 latch chip, the “J1” jumper and the two .1uf bypass capacitors, which instead of being through-hole mounting devices, these are mounted and soldered on one surface of the circuit board. They are smaller and a little bit more difficult to handle than their counterparts. Still, it is a simple job.

The resistor “R54” is not needed on this installation and the two capacitors are optional. So, the jumper “J1” and the surface-mount 74HC373 latch chip will be shown only.

This is the 74HC373 SMD Chip

This job requires average skills on soldering on electronics. You can always bring the ECU and the new chip to any TV or electronics shop, so they install the chip and the other parts. 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 it when soldering.

Please 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 isopropyl alcohol.

This installation is needed only once. After done, 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.

If you ever wish to go back to stock mode, like for emission test for example, 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 performance 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 the vehicle’s chassis and carefully disconnect the wire harnesses that are plugged to the ECU terminals. The wire harnesses can be disconnected by pushing a clip, located on top of the plastic connectors and pulling the connector back carefully.

After the ECU is uninstalled, put it in a flat table or bench and remove the bolts securing the top and bottom covers, using a #2 Philips 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.

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).

Next, flip over the ECU circuit and locate the spot of the “J1” jumper on that side. 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 or 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 chip the right way in the socket.

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

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