I just installed my JDM h22a+JDM P13 ECU+H23 harness into my '93 Si, and ran into some potential problems while installing the RyWire VTEC sub-harness.

There's 4 plugs on the RyWire VTEC sub-harness...and there's only 1 plug on my h22a that isn't on my h23a, and that's the actual VTEC solenoid plug. So I'm not sure exactly what the other 3 sub-harness plugs go to.

My current setup for the 4 new sub-harness plugs...

Right now I have Plug #1(Knock) going to the sensor just above the oil filter(the h23 plug is now un-used), plug #2(IAB) going to the black box mounted to the underside of my intake manifold(the h23 plug is now un-used, plug #3(VTEC) going to the VTEC solenoid, and plug #4(VTEC Oil) is un-used.

This current sub-harness setup doesn't seem right to me, but I can't find any clearer directions on how to install it...and I'm not very familiar with the JDM h22a, nor the extra sensors on a VTEC platform. The other end of the sub-harness is correctly installed into my ECU harness.

It will be another few days of work here and there before the car can be started, so I've got time to correct any issues. Any help is greatly appreciated...example pictures would be awesome. Thanks!

 

if it was me i would just pull teh vtec plugs and wires out of the subharness and use the factory plugs as much as possible.

 

If I used every plug on the h23 harness...that'd leave me with 1 un-used plug on the actual motor...the VTEC solenoid, which I could wire directly to the ECU.

Would this work considering the ecu IS NOT a p14 anymore, and is now a P13? If it worked...I can't see why RyWire would sell a 4-plug harness specific to swapping out the p14/h23 for a p13/h22 if only 1 plug is needed.

 

there are TWO wires required for H22 that are not on H23... VTEC solenoid, and VTEC oil pressure switch.

thats it.

 

JDM h22a doesn't have VTEC Oil switch, if I'm correct.

My setup is JDM h22a, JDM p13 ecu, usdm h23a harness, rywire sub-harness, h23a intake air sensor, h23a water temp sensors, h23a fuel rail, h22 injectors, h22a internal coil distributor(unsure about this one...do I need to use my h23a external coil distributor?), h23a fuel pressure regulator. The car was originally stock...'93 Si, 5speed, h23a, p14 ecu.

So basically...my h23a wiring harness, plus VTEC solenoid wiring will be all I need to run this motor...as far as wiring/plugs go? I don't need to re-run the IAB and Knock to a different part of the ECU harness because of the JDM p13 ecu, like RyWire claims with their sub-harness?

 

i am not familiar with the rywire harness, but i installed a jdm h22 head on my USDM h23, and there IS a VTEC oil pressure switch on the JDM H22 head.. there should be two connectors on your vtec solenoid.. one for the solenoid itself, and one for the press switch.

I used all the H23 factory wiring for all the existing sensors, and ran new wires for the solenoid and press switch

I used my external coil distributor, that way no wiring needs to be changed. You can use the internal coil, but it needs to be re-wired.

IAB and knock sensor i used the factory H23 wiring

 

The only plug/wiring on or around my VTEC solenoid...is the VTEC solenoid plug. There's nothing else there. : shrug :

I'll try to find a picture showing that area, so you can see.

Also...what ecu are you using?

 

I am using a JDM P13

this is what my solenoid looks like. do you not have the green plug on the right?

If i remember right, i'm not positive, but i believe the OBDII solenoid does not have the oil pressure switch... someone fill me in if ya know

 

Where the green plug goes...is a bolt, and it looks like it's been there for a while rather than being recently plugged.




Modified by socialistic at 4:19 PM 3/12/2008

 

You will need to get that press sensor. Without it, you will get a check engine light and throw ECU into limp mode, meaning 6500 fuel cut and NO VTEC.

there might be a way to trick the ECU with a resistor (i haven't tried it, but it SHOULD work with the correct ohm rating), but i would just get a new sensor

 

Ok, I'll start looking for a new sensor. I'll try to get that done before starting this thing.

EDIT: Does the sensor have to be h22 specific...or is there other sensors from other VTEC motors that are interchangeable?

 

If you need the vehicle, it will still start and run ok, just no vtec, and early fuel cut

 

i'm not sure...

here's where i go to cross reference part numbers: slhondaparts.com

look up the sensor for H22 and then try other models, civic, etc.. check if the part #'s are the same. if they are, go for it

 

Awesome, I'll try that out. I appreciate all the help.

 

no prob

 

What wiring needs to be done on the internal coil distributor,I have the exact same set up other than the dist. and can't get VTECH to engage and hopefully you may finally have my answer.I'm not getting voltage from the ECM to vtech pressure switch but in a friends car it works fine(the ECM) and it's been driving me crazy.Any info would be grately appreciated

 

Well, there's your problem. You're using a cordless phone instead of using your VTEC.

Common issues of VTEC not working on this setup...bad solenoid, bad oil switch, incorrect wiring.

Check to make sure your VTEC solenoid and VTEC oil switch are wired correctly to the ECU harness plug, and that you're using a VTEC ecu...not the h23's ecu.

Making your own thread might get you more replies as well.

 

Sorry for jumping on the thread, but well... I have a JDM H22A with a p0f-903 ECU, the car has no VTEC pressure switch, i guess that's why i have no vtec engagement, but i'm not getting a CEL for that switch, so i dunno what to do. any ideas?

 

Pretty sure there is a bolt where the sensor goes that you can remove and then just buy the sensor from the dealer, install and run the wiring and you'll be golden.

 

Are you throwing any codes? What ECU? What is it reving up to now? If you need the switch check my sig below.

 

Starting your own thread rather than necroposting in a thread from two years ago, would be a good start in the right direction.

 

the JDM H22a motors that have a bolt instead of a VTEC pressure sensor are from the JDM accord type R.... I got one myself.. there is a write-up that bypasses the switch.., and this is the bypass that honda uses on the accord type r..., instead of having a seperate ecu for no pressure switch, honda has a bypass write-up... here it is... I got this from honda tech originally

 

and that doesn't leave you with permanent VTEC?

and at what RPM does that H22 cut fuel? mine does at 6800 :S