I have searched and searched but I cannot find any threads related to my problem. I was running a virgin p28 obd1 and got a vtec solenoid and 02 heater senor codes. I replaced the p28 with another ps28 but with a Hondata s300 unit. That killed my vtec problem but now I have a CEL and when the scanner is plugged up it gets power but no communication with the car whatsoever. PLEASE help me fix this problem ASAP.

p.s. I hardwired the 02 heater sensor too. The harness is obd1 but there is a second o2 sensor which runs on the cat (in my case, test pipe) that I just avoided putting in since I am running an obd1 harness with obd1 ecu. The swap was done before I purchased the car. I'm trying to get a tune by the end of this week/early next week so I need to kill the CEL.

 

anyone???? BUMPPPPPP

 

And you only got the CEL with the Hondata? Sounds like a Hondata issue. Not a Honda issue.
Maybe just use a paperclip to pull your codes.

 

No I got the codes with the virgin p28 but that was because the o2 wasn't even wired up and I'm guessing it was for a single cam because vtec wasn't engaging at all until I swapped the ecu with a p28 that was chipped and socketed with the s300

 

So pull the CEL you're getting now.

 

That's the problem. After I plugged up the new ecu I can't even pit the codes with a paper clip. Plugged up a 8 thousand dollar snap-on scanner and it gets power but no communication with the ecu whatsoever.

 

Ok so I forgot to mention the motor is a '98 so obd2 but the eg is 95 (obd1) do I need a new wire harness? please tell me no.

 

Does ANYONE know what is wrong with my car? Anyone Anyone? Someone HAS to have had this problem before.

 

Little Ferris Beuller reference there if you didn't catch that lol

 

This slipped my mi nd.

 

I suggest you get an obd1 virgin p72 for that motor and pull the cel codes manually! It doesn't matter how expensive your tools are if you don't have the correct setup to read the codes then you will continue to have that issue. My .2

 

I still have the virgin p28 will that work?

 

So what exactly does that mean?

 

Did you read the quoted material UNDER that statement?

 

Yeah I did. I'm just trying to understand what you mean. So with an s300 you can't pull a code with a scanner?

 

"no communication through the DLC" pretty much means, no communication through the DLC. What do you think it means? I thought it was self-explanitory.
But swapped cars are not my specialty so maybe someone can come along and say that statement is wrong. But I did pull that quote out of a post that had the exact same setup you're running and the OP asked the exact same question.

 

You tried to answer my question with the exact same answer you gave me...you don't need to be a dick I didn't know what the DLC was...

 

jump the connector and count the flashes?

 

 

ok so I got home from work and hooked up the laptop to the s300 unit. o2 heater code and knock sensor. o2 was hardwired so I just decided to disable it. As far as the knock sensor code...the car idles normal and is not going into limp mode but why am I getting the knock sensor code?

 

and yes the knock sensor is plugged up

 

The knock sensor might be defective?

Bad plug?

Wrong plug?
Try to see if any of these apply to you and if they do fix it an check again.

 

About the virgin p28 working some say yay,some say nay but that ecu is for a SOHC VTEC so try a p72 (obd1) and go from there that might help you fix the problems that you have now

 

I'm running a jdm p72 basemap. I have a s300 unit. or do I straight up need a p72 donor ecu? I thought p28's were the exact same. I hope I don't need a p72 cuz I had one when I first got the car.

 

I'm about to go out and buy a knock sensor and see if that fixes the issue. I'll keep you guys posted. Thanks for all the help so far.