h22apwrdcivic

this car is my brother in laws. when he got it of course it had the f22b2 non vtec motor in it. we began by removing the motor and transmission and converted it to a manual then dropped in a h22(jdm obd1) motor. then it came time to pass emissions. he then bought all the sensors and oil pump assembly to convert it to obd2. even purchased an ecu from ebay from a company called speedinnovations.com.

ok so now its running obd2 and we are getting some issues. there is obviously something weird about 96 accords because i have a 97 and have noticed some missing sensors under the hood of his 96. ok so first code i got on test drive is p0450, i called the company i got the ecu for and advised them the 96 accord/prelude did not have a fuel tank pressure sensor, so they emailed me a link of how to get rid of that code(by using the potentiometer and putting 2.5volts into the ftp input at the ecu)...that worked, no more p0450.

so now we have code p0136, i read some possible issues with this code and one was to swap out the downstream oxygen sensor. i figured that had to be the issues since we had to use a different cat on the car due to the prelude header being longer, so i threw in a o2 sensor i had from a civic. so now it has a new o2 sensor and we are still getting that code on test drives. something weird about p0136 is when i look up 96 accord or any 96-01 prelude(being thats the ecu we have) it does not show that this is a monitored code for that vehicle or ecu. wtf is going on? right?

yesterday i took it for a ride and got a p1457. immediately i turned to alldatapro.com and pulled the trouble tree that looks like this(first page only)

if you see the canister it shows that it a has a sensor on top of it and tells us to check the two sensors that are bolted together. here is the weird part about the 96 accord....it does not have that canister, it does have a canister but it does not have a sensor on the top of it. my 97 does, the 96 does not.

what i am looking for is hopefully someone has had this same issue and just not posted about it. but i am looking for hopefully a trouble chart i can follow that is for the 96 accord with the sensors it has for me to resolve this issue/issues.

i did call speed innovations and asked why i was tricking the computer instead of having the right computer and they told me that because whenever they get the latest update to the ecu firmware it supercedes the previous edition and wipes it out of their files. so i must trick it to work. thats fine by me but the emissions tags on this car expired in january so we are now almost 2 months passed due.

someone please help, i greatly appreciate it if you can.
im not an idiot by any means i just dont understand why alldatapro is showing the 96 to have all the same sensors as the 97 and up accords when they visually dont.

thanks

GhostAccord

The EVAP purge control solenoid should be mounted to the firewall just behind the throttle body on the 96. You should be able to follow the vacuum lines to the solenoid. There should be a vacuum hose from the canister up to the solenoid then to the intake manifold. If it's not there that would probably be why your getting the error code.

h22apwrdcivic

yeah that is there on his car, but the trouble flow chart is telling me to check other sensors and when i looked under my hood i seen a few other sensors on firewall that the 96 does not have and i put the h22 in so i know we did not remove them. look at this picture from alldatapro.com. in addition to the canister with the shut valve on top of it, it has these as well(96 does not have)...how do i pass emissions setting these codes if i dont have these components?


all the components labeled in this picture are not on the 96, at least under the hood.

GhostAccord

Do you still have the vehicle emission control information (VECI) & Vacuum hose routing labels on the hood? It will show you what is in that chassis for EVAP system components.

I have another picture of my engine bay that has an EVAP purge flow switch mounted on the fire wall, directly behind/under the throttle body. I don't see a fuel tank pressure sensor though.

That Alldatapro pic is a wee bit off for the 96-97 Accord that I have as well.

Here is what I have in my manual.


These are the only two sensors I have on my 96 for EVAP control under the hood.

h22apwrdcivic

here is the firewall of said car with issues....




only 3 evap sensors and the canister with no sensor on the top. like i said my 97 accord has way more. i did find that there was a difference with the 96 accord lx non abs versus the lx with abs and other model 96. but how can i find out how to properly diagnose the p1457 code when the majority of the charts are for the mass population cars instead of the 96 lx non abs edition.

h22apwrdcivic

ok a friend of mine in Atlanta asked their Honda master tech at the dealer he works at and he told me the reason it is setting that code is because it is looking for the sensors it doesnt have and for that reason i need to have a 96 honda prelude h22 ecu b/c the 96 prelude and accord are the only cars different from all the rest of the obd2 accord/preludes. great! so i told this ecu company we ordered it from that it needed to be for a 96 accord with a obd2 prelude in it.

any ideas on the p0136 error code?

anyone know of a 96 prelude ecu that is obd2?

Rockstar21

i dont think they converted to OBD2 until the 5th gen prelude in 97.
im almost positive all of the 4th gen ludes are OBD1

could be overlooking something though..

h22apwrdcivic

nah, all 96 vehicles are obd2 that was mandated by the federal government. 96 preludes and accords just didnt have all the sensors that the 97 vehicles did.

Rockstar21

strange, my brother must have had a secondary motor installed before he bought his 96 lude.. his was obd1.. seller never mentioned a swap...

strange...

h22apwrdcivic

if you look inside the door on drivers side on the vin label it might be the early part of the year in 96 which would still be 95 design thus obd1. anything after the half of the year is the next year model.

urnemesis

I bought a (2001)H22A4 OBD2 to swap into my (1996) Accord LX. I am aslo planning on putting the transmission that came with the base model lude. Will I be able to keep the Accord Lx ECU?

h22apwrdcivic

yeah you can use it....it wont pass emissions nor will it run 100% right. your choice...i would say no b/c you want to get the full potential out of that motor swap.

mavvrik

Did you just get gas by chance before you got the evap code?

h22apwrdcivic

haha no. it has been figured out. the ecu company gave me an ecu programmed with the 98-01 firmware, which is incorrect. especially when i clearly put it in the request form when i purchased it. when i called their tech support they said they no longer keep the 96 & 97 firmware b/c it is superceded by the 98-01. If thats the case they need to quit lying in their advertisements saying they will work with 96 & 97 vehicles. IT WILL NOT! unless you want to add a few emissions sensors that are needed to correctly monitor for that ecu firmware.

h22apwrdcivic

ok we sent the ecu back to the people we got it from...they "said" they were going to "reprogram it with an early 97 firmware" well when we got the ecu back we plugged it up and on the scanner it has no icon for EVAP system. so it looks like they know how to turn off monitoring of certain systems.

so we drove the vehicle and are still getting a p0136 oxygen sensor bank 1 sensor 2 code. the sensor is brand spanking new. the strange part still being that none of the 96-01 preludes or accords should monitor for this code, or so alldatapro is telling me. the code is not in the list. what to do now?