i need to know, the engine runs but is throwing the "22" code, vtec pressure switch, i don't' even have that on the car!! its not beside the solenoid! i don't' know where it goes but lots of people keep telling me my car is wired for it. so whats up?

 

They're not prewired for VTEC if you a Si. how many long and short flashes do you see when you check the code.

 

Ok, so you have a h23 but your getting a code 22? You probably have the wrong ecu. You need a P14, not a P13.

 

If the electronics module is original to the car and it was previously running, then the wrong unit is much less likely. One possibility is a misinterpretation on the code. If you have four flashes, you may have a 13 (Barometric Sensor). The code 2 and 31 are other possibilities, but they do not appear to be valid codes.

 

you need a p13 ECU and Si models are prewired for vtec but you have to continue the wires - ie extend them and make clips for the solenoid and the oil pressure switch

 

thank you for that info, thats what i was looking for. i left out the part that i swapped in a jdm h22a vtec motor! so i have the right ecu (p13) its two long flashes and two quick,short flashes! so its 22( i had it checked at a shop!) so i know its the pressure switch but my vtec head doesn't have it on there, there is a solinoid and nothing else. and what wires do i need to tap into, thats what i need to know, what the harness looks like and all that ! i have a 93 prelude si, so what colors do i look for on the car?

 

Sd u don't have a pressure switch on the housing?? I'd be more concerned with that than where to run your wires. If your car is prewired, that just means that they're wired into the ecu and run to the engine bay. They will be found on the harness side next to the cabin but end there. Ones baby blue and the other is yellow and black or yellow and green. I'm not completely sure right off.... How do u not have a pressure switch? Take a pic of the housing and post that. I think you may be a lil confused....

 

here you go, i dont' see a pressure switch, i've been told some don't have them? again, its a jdm h22a from a 93-95 prelude

 

I'm not exactly sure about this, but didn't JDM H22's not have the oil pressure switch? If I'm right about this, that would mean you have a JDM H22 with a USDM ECU. The USDM ECU looks for the pressure switch which the JDM H22 does not have, thus the code.

And to clarify, 93-96 Si Preludes are wired for VTEC from the factory.

 

No, a jdm h22a does have an oil pressure swith. (i have one in my car) As far as the pics go i cant really see them, i'm on my BB right now. When i get back to the office tomorow i will look at them and see.

 

well if that is the case, then why isn't the computer throwing the 22 code?
i got 12, 21, and 23, thats, egr, vtec solenoid and knock! i dont' get it!!! i don't mind getting a vtec unit off another car or something, but whats going on? if it was indeed a pressure switch issue than it should throw a 22

 

I'm pretty sure both JDM H22A's I've had personally have Pressure switches.. The VTEC Solenoid I have on hand, DOES have a Pressure switch. Since my car was stolen and at the shop right now, I can't check it, but I'm pretty positive it does also.

But what I see as you're problem there... Is you don't actually have the "Pressure Switch." It's not there. It should be where that clean silver-ish bolt is.
Seems it might have been removed and plugged?? That's why you don't have one.. lol

 

well what about the cel? why doesn't it say anythign about the pressure switch? and can anyone take a pic of there engine bay, or really of the vtec wires or how about this i will go take some pics of xtra wires i got and you guys tell me which ones are vtec!

 

http://www.hondaautomotiveparts.com/...R+HEAD+%283%29

Number 19 is what you're missing.

If you want a picture of the Solenoid I have on hand, I'll go pull it outta the box and take one for you.

 

I believe one of the plugs needed for the Solenoid is on the Passenger Side Shock Tower.
At least that's what the rumor is.. But when my swap was done, I don't think they used it.

But I can't check my car, I don't have it..

 

here are some extra wires, all on the left (passenger) side

 

Ok, here is a Wiring Diagram. It has both the VTEC Solenoid and Pressure Switch Wiring's.
http://mlbz521.scorchgaming.com/Manu...s_Figure_3.JPG

Item, Wire Color --» ECU Pin
VTEC Solenoid, Grn-Yel --» A4
Pressure Switch, Blk-Red (Ground), LT Blu --» D6

 

I don't know what all those extra plugs are off hand. But you have some weird wiring going on..

Is that Green-Yellow wiring on the far left in the last picture going some where?
And if you have a Multi-Meter you could trace that Blue one in the first and last picture and see if it leads to ECU Pin D6.

 

hey get this, i just reconnected that green and yellow single wire to the vtec solenoid and all the other codes went away adn teh only one flashing now is the vtec presseure switch!!!! 22

 

Yea, that's what I figured would happen.

Can you get any other angles of the VTEC Solenoid Housing? Like from the back and underside? I'll compare it to mine, just to make sure you have the right one.
But I'm pretty sure you just need to get an Oil Pressure Switch/Sensor Unit and wire it up.

 

well i can't get any pics till tomorrow, i've retired for the night!! been working on my sisters car and going to work on my buddys jeep so i'm kinda spent! but tomorrow ill get some pics up of it! i know that the pressure switch will fit any vtec acura or honda, im not sure how many generations it spans but i know there the same, along with the solenoid too

 

Okay I did the actual research, we were both right. OBDII JDM H22A's will NOT have a VTEC oil pressure switch, while an OBDI H22A WILL.

You figured out the EGR and knock sensor so thats fine. The pressure switch will still be there becasue the ECU is looking for it and it isn't there like others have stated.

Those motors you had were either both OBDI or whoever did the swap simply installed a pressure switch.

I know the blue one is the tachometer signal wire for diagnostics, and that stump with all those wires going to it is normal, it just connects a few of the wires in that loom together.

All I would think you would have to do to get rid of the code is find a pressure switch, take out the bolt under the VTEC solenoid, screw in the switch, and wire it up.

 

That's the same solenoid I have. only 1 wire. It's a JDM H23A. If you have that engine the pressure is controlled internally. and you will only use green wire.

 

thread is pretty much dead, but in case this pops up again for future reference on the obdII h22as without the pressure switch it has to be deactivated in the ecu and you connect the solenoid to both the solenoid and the pressure switch locations in the pinout, then vtec should work fine and you should get rid of the code.