Well the purpose of this thread is to show the honda heads and anyone that wants to know how to chip a Honda ECU. This will be 2 parts, the first part is a How to convert your P05/P06 to a P28. To those who don’t know, P05 and P06 ECU’s are non-VTEC and P28 ECU’s are designed for VTEC Engines.
The second part will be how to chip a Honda ECU…i just have to get a chipping kit first 
anyway here we go…
How to convert your P05/P06 to a P28:
Before you start, grab a beer, put on some music, movie, or your favorite video of your neighbors daughter. Be ready to be patient and take your time.
First off let’s figure out what ECU board you have. This DIY is for a 1720 board which can be found on top of the ECU.
Okay…so we have a 1720 board. Next is laying out the components that came in your VTEC conversion kit and finding out where each one goes. You’re going to have to solder 9 components for a P05 and 8 for a P06.
Pics of components and spot they go:
In Spot IC14, solder this part
In spots Q26/Q30 solder these transistors. Q30 is only needed for P05 ECU’s (so the ECU can run a 4 wire o2 sensor) The transistors are directional so look at other ones on the board or look how I soldered them.
In spot C60 solder this little number. It’s polarized so be careful to solder it correctly, you can see the + sign on it and you can see the + on the board as well…so just match it up
In spot R67 goes this resistor, its a 820 ohm resistor (Gray, Red, Maroon, and Gold Stripes)
In spot D11 goes this diode. Pay attention to the direction, you can look at the other diodes on the board to solder it in correctly.
Okay…now in Spot RM11. If your ECU is auto you will not need to do this…but if it is manual you have to. There is 8 solder points. 1 is on the left (holes are figured left to right, ECU plugs are on the left)
From pin 1 to 2…10k Ohm (Gold, Orange, Black, Brown)
From pin 2 to 3…51K Ohm (Gold, Orange, Maroon, Green)
From pin 3 to 8…12k Ohm (Gold, Orange, Red, Brown)
If you can’t see the colors like me…use a DVOM and figure out which one goes where by finding out the restitant values.
Okay so now we now what is what and we can begin soldering. It may be hard to find all the locations on the board…but just take your time and everything is located in the upper left of the board for the most part.
So now we start de-soldering everything we have to. It should look something like this.
Now after you go through all the points on the board…start soldering parts in.
Here you can see IC14, C60, R67, and at J10 you have to solder a jumper in (use a piece of a resistor)
Here is D11…note the direction of the diode.
Here is Q26/Q30 again note the direction of the transistors.
And here is spot RM11…this might be a little tricky…just take your time.
And voile you’re done! It’s not complicated…just time consuming. So take your time and be patient. If any of the OG Honda guys have any input for this please post it up. Enjoy
:edit: If anyone needs help or is looking into doing this, just shoot me a PM and I’m more than happy to help.
-Anthony
