hey guys,
i have a 95 cx with a jdm b16a sirII.
i recieved a chipped p28 with it with what im assuming is the obd1 b16 program.
after swapping and starting i have a code 20 which is the ELD which our canadian cars do not have. because of this code, vtec wont work.
what id like to know is if i use a virgin p28, will the vetc work? i know the cutoff points and such are different, but it shouldnt look for the ELD.

any suggestions on what i should do to get my vtec running?

 

open your ecu and cut the wire at location J12. This will return your chipped p28 to stock. Its much cheaper than buying another ecu.
I think vtec will work with an ELD code. Are you sure you wired up vtec properly?

 

Vtec WILL work when throwing an eld code.


Check your wiring

vtec solinoid to a4, vtec oil pres switch to a6. You dont need a knock sensor because you are runing a p28.

Does your speedo work.

The only things that can cause vtec not to work is the following

-Low oil level/pressure/extreme dirty oil
-VSS that is not communicating, whether it be the sensor itself or bad connections
-Dirty screen on the vtec solinoid
-vtec solinoid itself
-vtec oil pressure switch itself
-car running in limp mode, or car not in closed loop.

 

vtec will enable if you're not in closed loop. I've been running my car in open loop for quite a while now and vtec works.
Vtec will also not engage if you are going too slow or if the engine coolant temperature is too low.
Are you sure that you got a p28 and not a p05/p06/p75/pr4?

 

yeah, the vtec is definately wired properly
im going to go clean the solenoid screen, and check my oil right now.
then if it still doesnt, ill try the j12 thing.
is J12 labeled??

 

ya it is. It's right below your chip.

 

so i found the J12, but there is nothing there as it is. i can see there there WAS soemthing there

 

uhh..dont you mean D6 for the pressure

 

umm.. if theres nothing there your chip isn't activated..

 

word

 

yeah i figured that too, so much for being given a "chipped p28" with my swap
i just cleaned out the solenoid screen, and double checked the wiring, gonna give it a try again

and whats limp mode/closed loop??

 

limp mode is where your car won't rev past 3-4K.
Closed loop is when your ecu reads o2 sensor feedback and makes adjustments according to the feedback from the o2 sensor.....or how ecus run normally.

Take a picture of the inside of your ecu. I meant to say j1 not j12. If there is no resistor in j12 that means your ecu can be fed a wideband o2 signal. If there is no jumper wire in j1 that means its not reading off the "chip". J1 is located right above where the "chip" is.

 

so i reset the ecu and whatnot, and i have code 21, which is the solenoid. so im thinking it needs to be replaced.

oh, and how can the chip not be working. i can get my revs up to 8000.

 

This is where J1 is. If there are parts in the red box then your ecu is chipped. If not, then its a virgin ecu.

 

ahh i found J1, and theres just a wire going from point to point. no resistor.

 

and its chipped, so if i clip this wire, it willbe "virgin" again?

 

yes, if you cut the wire at J1 it will no longer be reading from the "chip", thus returning it to stock.

 

before i cut it, is this something i should consider doing, like you mentioned earlier? i know ill have a low fuel cut off, but just to get the vtec working ill be happy

 

umm...well i wouldn't cut J1 in hopes that your vtec will work. That will mean you will be using a stock p28 to run your b16, which IMO isn't exactly the best idea. The fuel/ignition maps are different between the d16 and b16 programs.
If you're getting a code 21 then theres a problem with your vtec spool solenoid valve. Check the wiring, check to see if the solenoid clicks when you put 12V to it. If it doesn't click, its not working properly and you need a new one.

 

i checked the solenoid and it clicks when i put power to it, the screen is clean. now im not sure what to do next, i cant see anything wrong with the wiring. might put the ecu back to stock. any other suggestions andrew?