This was just my experience but it will give you an idea of what you might expect when adding KPRO to your 03-05 k24a4 Accord. Its a different approach with the Accord since you end up running 2 ECUs and routing functions to each one. One controls the vitals of the engine and such, while the other controls things like the AC, Speedo etc.

The stock ECU lies behind the cubby in the center console. You can get to it by go through the passenger side. 1 clip holds the plastic cover in place.

My parts list:
1 of these : 02-4 RSX ECU (Base or S) - EP3 Civic Si ECU appx $200
1 of these : 02-04 RSX (Base or S) - EP3 Civic Si - 04-05 Civic D17 Wideband o2 sensor $200-$300
KPRO : $1000
Kpro Dual Harness: (Cham may still make them) $350
Soldering Iron
Heat Shrink
Solder
Bullet Connectors
Butane Torch
16g Wire
o2 Sensor note: The Accord o2 sensor plug is FEMALE while the RSX and EP3 sensor is MALE
You can use BUTT CONNECTORS (yes, I said butt connectors as T1 Race Development advised me wouldn't hurt anything) to splice in a FEMALE plug to the new sensor since soldering them properly is
almost impossible. (notice I say PROPERLY) It is possible to fool with it long enough to stick a little bit of solder (as I did the first time on mine) but it wasn't as solid as I felt it should be. This is due to the o2 sensor using stainless steel wiring, as opposed to standard copper wiring found in the rest of the cars wiring. This is what makes it so hard to solder o2 sensor wiring.

other o2 option:create (or buy) a FEMALE-FEMALE o2 extension. This makes everything a plug and play experience and makes things faster. I ended up doing this on round 2 when my 1st o2 sensor went bad (it was used when I got it)

My parts list for making the female-female o2 extension:
4 Injector Dynamics Injector pins (same as female pins on Honda o2 sensor plug)
Crimping Tool
2 female plugs

My o2 Extension:

Props to T1 Race Development for this

Expect to spend anywhere between $1500-$2000 to go KPRO. This depends on if you do all your labor, pay a shop to do it and also how cheap you find the sensor, ecu and KPRO. I know some shops sell KPRO a bit under $1000

As Tim on Elitecm.net has said before: This mod is only for those looking to make a good chunk of power down the road. Whether its a big all motor build or forced induction.

I do not advocate anyone to go do all this just to squeeze and extra 10whp from a bolt on affair car. In that case spray a 35shot of nitrous for $500 and call it a day


For those wanting to know the kpro process , here it is

My kpro install was a bit different than other Accord Kpro installs because my harness did NOT come with the VTC- and VTC+ wires ready to be ran into the engine bay.
Before we continue , I want to make you aware that I will be referring to pins as a letter followed by a number (ex: b1) The letter means the plug, and the number means the pin on the plug.

Here are the Accord ECU Diagrams so you get an idea of what im talking about:

Note: The Manual ECU only uses plugs A B and E. While the AUTO uses C and D in addition to those, in order to control the transmission.









Cham (the creator of the dual harness) told me on the phone he was trying something new on mine that may or may not work. Well it didnt work 100% but did 50% . It saved me from cutting the VTC+ wire at the solenoid on the motor and required me to run only 1 wire (VTC -) into the bay.

I initially tried the harness as it was shipped to me but immediately it popped a P0010 code for VTC Oil Control Solenoid

Turns out that Cham had both B23 (vtc -) B1(vtc +)wires going to B1 pin.

The reason behind the glitch is simply this: The Accord uses a BODY GROUND for the VTC Oil Solenoid, while the EP hatch and RSX use an ECU GROUND. I tried splicing wire B23 (vtc -) into wire A4 (ecu ground) but it didn't work.
My only other option was to run B23 (vtc -) straight to the solenoid. This ended up working.

I made a mini harness that would go from the dual harness , into the bay using bullet connectors. I soldered and heat shrunk everything in order to avoid any problems down the road.


I also setup a ground at the passenger floor board which would allow me to go back to stock a lot easier than having to mess with the VTC solenoid plug in the bay since its a tight squeeze full of sharp edges(see bloody hand picture)


Ill let the pics do the explaining. Feel free to ask away if I missed anything. I hope this helps someone out there












Note:The hose was only used to run the wire into the bay. Then it was put back in my garage

 

Excellent...

 

Nice setup.. I'm planning to do similar to my TSX. Do you know how to get in touch with Cham?

 

Try elitecm.net I think hes more active there.

 

I'm really curious how he wired in the 02 sensor since the Accord/TSX does not have AFSHTC+ which is pin A22 on the RSX ECU. I'm also curious if your harness disconnects the 02 sensor from the accord ECU since we are installing an 02 sensor from an 02-04 RSX.

I've figured out the VTC+ and VTC- as the TSX is the same. Now I need to figure out if he tied the sensor grounds between the 2 ECUs or just tied into the signals for the wires on the KPRO side.

 

Oh thanks you so much.Its really very helpful for me.I would also like to install KPRO in my car.The instructions are so good.

 

VTC wires either go straight from the sensor to KPRO period. Thats the method that has been shown to work.

all the sensors are going to the KPRO ecu.

excellent question on RSX A22, I did trace some of the wires on plug A prior to hot gluing them to ensure they didnt come apart at the male main plug.

A22 on the RSX shows : with ignition switch on (II) Battery Voltage
Since A2 on the Accord is the same thing, this is where RSX A22 taps into

The Kpro ECU definitely takes away the stock narrowband o2 sensor from the stock ECU since we use the factory plug to plug in our new wideband RSX o2 sensor remember?

 

Sorry for the late reply but I figured I should mention that I eventually did get a K-Pro working on my car after asking K-Tuned for help.

http://k-tuned.3dcartstores.com/Dual...3-05_p_16.html



They make the Kpro Harness for the TSX and Accord setups now..

 

$520??!?!!??!!?!?!?!

 

I Got Cham's Daul Ecu Harness And Kpro Installed But The Car Wouldn't Respond To The Ecu At All Does Anyone Know What It Could Be? I Just Plugg The Ecu In And Tried To Start The Car I Didn't Ground It Or Anything But The Kpro Was On Because The Harness Check Engine Light Came On

 

Don't take shortcuts. Grounding is very important.

 

Really all you get out of using kpro with bolt ons is 10hp? That sucks...

 

Very intelligent reply.

 

Lol i was quoting what u said above.
On other sites people have reportedmore gains than that.
So thank you for that very useful post u retard lol Hahah

 

Good instructions!

 

I know its 4 month old post but have you made any progress with this setup? Done any boosting, turbo/supercharger?

 

Hi everybody I'm doing this ecu installation right now and I fine this very helpful for me but I can't see any pic for now
can somebody help me out please!!

 

So since cham doesn’t make the dual harness I think ima make my own harness it would be really helpful if I could have a diagram that shows which and where wires go to the accord ecu and which go to the kpro

 

Thats great info!!
but i had followed your instructions to install kpro, everything is fine, but the check engine light is on, how do i fix it? Thx!