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1993-1995 Accord – Prelude Performance Chip Installation
Posted by Richard 2 February, 2010
This is the following Honda ecu computers: P0A, P0B, P0C, P0H (OBD-I), P11, P12, P13, and P14.
Installing a performance chip on 1993-1995 Honda Prelude and 1994-1995 Accord is a single procedure that consists of removing the stock chip, soldering a socket in place and inserting the performance chip on the socket.
Different from the OBD-I Civic and Integra ecus, which you must add some extra parts, the OBD-I Accord and Prelude ecus do have a stock chip that can be replaced, making it simpler in a way, but tougher at the same time in another, because you will need to unsolder the stock chip, which is held with soldering in both top and bottom sides of the circuit board.
Note: This job requires average skills on electronics soldering, but it doesn’t require skills on electronics. You may always bring the computer, the new chip to any TV or electronics shop so they can install the chip, 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 (multi-layered) board that are sensitive to too much heat. Always clean the finished job with a mild solvent like 91% – 99% isopropyl alcohol.
Your car’s ecu 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.
This installation is needed only once. After that, it will be a matter of pulling out one chip and inserting any other, every time you want to switch between “Stock” and “Power” modes. These instructions cover all 1993 to 1995 (OBD-I) Honda computers that are listed at the top of this page for Accord and Prelude.
For installing the chip, just find the 28 pin chip marked as “M38256AP-xx” (see the picture bellow). It must be unsoldered and replaced with the 28-pin chip socket, and then the new performance chip must be inserted on it. Make sure that you align the chip so pin #1 goes to the same place of the old chip (lower left corner of the chip in the picture bellow). No other parts are needed on these models. After inserting the chip, just put the ecu back together and reinstall it in your car.
Note: The “xx” after the “M38256AP” is different in every computer. That is the code of the program written in the chip. The picture below is an example of the P0A-A51 (F4). For P0B it will be “F5“, for P14 it is “C8“, and so on. Every ecu has its own code. Even the Prelude’s P13 have 4 different codes, which are “A6″, “E6″, “C2″ and “C3″. On this case, the code depends on the Domestic Market of the ecu. SO, A6 and E6 are Japanese (JDM) and both programs are different. C2 is for the USA ecu (USDM) and C3 is for the UK European ecu (UKDM or EDM).
One good technique of removing the chip, though still requires patience, is soldering all the pins of the stock chip together and fill it up with molten solder, then heating both sides at the same time and gently prying it with a flat screwdriver. This, of course, will require two good soldering irons of 35 watts. Please do NOT use soldering irons hotter than that or it may damage the ecu and the stock chip. The best non expensive and very good quality for this are the Weller brand. Radio Shack’s irons are NOT appropriate for this. Those are more for hobbyists than for heavy jobs like this. Before starting, always spread in all the area to be worked some electronics soldering flux paste to facilitate the job, as it cleans contacts and rejuvenate soldering when heated.
After you finally and GENTLY pull out the chip, you must clean it with desoldering braid so it can be used again whenever you want to go back to stock mode. Otherwise, if you damage the chip when removing it, you will need a copy of the stock chip if you want to go back to stock mode. You can either burn your own or order it from places like http://www.otherdeal.com Just drop a quick message at the contact form on that page requiring what you need. Also, on that page you can pay for the service of installing the socket for you, handing your ecu over the mail.
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Categories : Automotive
hi? i bought the spoon chip i took it to a professional and i got it back and i install it and the car is not running right. its sounds like the fuel relay is tweeking off and on. the car was runnin good with out the cpu and once i put in the spoon chip is starting to mess up. please help, oooh i just bought your chip tooo see if your chip will work. help me. so everytime i start the car there is a clicking sound inside the car, its sounds like is the fuel pump relay..
Hello Efrain.
Do you still have the original chip? If you do, test the ecu with it. If everything works ok, then as you will guess the “Spoon” chip is the problem.
If it keeps the same with the stock (original) chip, then something happened to the ecu circuit when the installation was performed. In that case, it must be checked for loose or bad connections, broken traces on the board (either at the bottom and the top of the board) or soldering jumping one or more points.
If the Spoon chip is the problem, do not worry. Our chips are modified from the original, so you will get the extra power without disturbing the original functions of the ecu. If it doesn’t work well with ours, you can be sure that something happened to the ecu.
When your chip arrives, please check the instructions so you notice the orientation of the chip, since if it is installed backwards it may harm the ecu and / or the chip.
If still have problems when installing our chip, don’t worry, help is always available. Just contact us for further assistance. If at the end, the problem is the ecu, we can take a look at it to see if we can fix it.
Cheers,
Richard
i bought a spoon chip as well had it professionaly installed and now my car wont rev over 3000 rpms and sputters like crazy can u help me out i was smart i bought a 2nd p14 so my car is back up and running
help me i bought a spoon chip and it dont work in my p14
Hello Chad.
Have you tried putting pack the stock chip on the modified P14? If you do and it comes back to normal, then the problem is in the chip, it is either not compatible or damaged.
If it was professionally installed, I guess that they gave you back the stock chip they took out and also a socket was installed, so the chip can be pulled out and replaced.
The ecu is now on a protection mode called “limp home” mode. The ecu assumes that mode to protect the engine when a problem with the chip or circuit is found. You will notice the check engine light on, not revving more than 3300-4000 RPMs and a very rich fuel mixture.
Just let me know.
Regards,
Richard