did your stock engine come with VTEC or not, is so you are lucky, if not, you have to add l the wiring for VTEC selonoid and vtec pressure switch.

okay, i used the existing accord wiring harness all the plugs hooked bak up to the h22a in the engine bay except for a couple, I plugged it in to the new ecu.

i only had to lengthen the wire on the stock accord harness for two sensors in the engine bay ( IAC) middle top of inlet and IAT (passenger side on inlet manifold) the rest of the wires reached. You will have one wire left ( ECT switch B ), this will hang around under the distributor, this wire is not needed when using h22a ( it has a green plug) Also you have to swap pin A11 o2 sensor with A6 ( A6 has nothing in it.) at the ECU

what you will need to do is add wiring for the-
-knock sensor above oil filter on back of engine block red/blue, goes to pin D3 on ecu

-IAB (intake air bypass) on a black box under the intake manifold on back of engine block( pink wire) goes to pin A17 on ecu
IAB 12V black/yellow ( connect this to 12V)

my JDM h22a came with EGR ( exhaust gas recirculation) system on it. Something which the aussie 5th gens dont have. I wired them all up and routed the wiring back to the ecu but have yet to hook it up, it makes the car run a little rich and sometimes the CEL light comes on.


I have put up a pic of the new loom my mate made that connects to the knock sensor, IAB and EGR sytem. there is also the fast idle thermo valve sensor, which i have not hooked up.

when we tried to hook up the egr and the fast idle it took for ever then we started the car and it ran sooooo ferkin rich , the fuel was literally being spat out the exhaust and the motor would not rev over 6300 ( it was like the rev limiter was set at that. so we unplugged them aand it ran fine except for a rough idle and still running fairly rich ( this ended up being a vacuum hose hooked up wrong) and the rough idle is gone now.

the car runs fine, even with out EGR (which is basically electronic pollution gear) remember that the stock f22b engine never came with it.


Here is the h22a wiring digrams, what we did was pulled the h22a harness to bits and got the correct coloured wires including plugs that connect to the sensors and made the new loom with that, so for future people working on the car the colours would be the right ones if they refered to a wiring diagram.

If you have another ecu plug, get the metal pins out and join them to your new loom, then they will pop into the accord harness plug. you will see what i mean as you can open up the harness plug where it goes into the ecu. They can be tricky to get out, undo the plastic hinge on the plug and get a pointy tool ( like a big arse needle) and carefully get them out with a little force.


This the new loom, including plug in the middle of it that we mounted in the engine bay next to other plugs for that factory style look.




This is the new loom mounted in the engine bay


The new wires that plugged into the correct spots on the loom plug


Here is the pin out chart for the h22a ecu, for example, pin A6 is on the plug on the left hand side, 3rd from the right at the bottom. :P


page one of the ecu wiring digrams



page 2




page 3



sensor locations



vacuum hose diagram





Anyway, make sure you use a soldering iron etc, none of this twist the wire together and wrap it in tape. I had an advantage as my best mate wires up cars and trucks all day long ( cb's, mobile phones,stereos etc) and is handy when it comes to this sort of shit.


A good way to check your sensors is to jump the ecu so you get the error codes on your check engine light. if u want to know more about this, let me know. ( it helped soooo much.) Most of the time, it will tell you what sensors arnt hooked up, but you might have dodgy sensor ( i was getting a code for the O2 sensor and i thought it was becuase i hooked it up to the ecu wrong- turned out the o2 sensor in the prelude 'A'" pipe was stuffed, so i swapped it for my accord one and that cleared the code.


When i jump my ecu ( all you need is a paper clip you know) i get 2 codes. EGR ( i know this is nothing major) and ELD ( electronic load detector) this is normal as the 5th gen aust spec accords dont have an ELD sensor ( which is part of the main fuse box where it should be. Once again, the JDM front cut had one and the JDM ecu hasnt got a signal from it...it and the fuse boxes are not interchangeble between the 2 cars. so it throws a code. this is nothing major either.


anywho, if you get stuck , let me know and i'll do my best to get you sorted. if u need an error code sheet for the h22a , let me know and i'll post it.

I almost went insane wiring up my h22a, it all looked so freaking complex but if u concentrate on on thing at a time u will eventually complete it and think "gee that wasnt that hard"

this might help you also.
http://www.accordwagonclub.com/5th_gen_swap.htm

Carn the H22A's :P