Hey guys, I have a situation that need some help fast. I have a LS/Vtec, B18B block with SI head and chipped P28 ECU. Recently, when ever I hit the Vtec, about 30 seconds after that the CEL go on. I check the code and it's always code 22. Before the CEL go on, the car pull strong, Vtec kick hard. After that, the car still run strong, but no Vtec. What could be the cause? Thanks for the reply!!

 

Do you have an apex vafc by any chance?

 

Could it be that you don't have enough oil?
Also do you know if the p28 did that before? it is very possible that the vtec switch inside the ecu got burned, and will throw a cel after 1-2 vtec hit.

I know that when I chip p28s you need to make sure you got everything done correclt, otherwise the above will happen.. you'll get vtec, vtec.. and then cel
But it's a very rare occasion. although possible.

So check oil pressure, and also good question.. <TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1bad-eg &raquo;</TD></TR><TR><TD CLASS="quote">Do you have an apex vafc by any chance?</TD></TR></TABLE>

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PaintStripper &raquo;</TD></TR><TR><TD CLASS="quote">Hey guys, I have a situation that need some help fast. I have a LS/Vtec, B18B block with SI head and chipped P28 ECU. Recently, when ever I hit the Vtec, about 30 seconds after that the CEL go on. I check the code and it's always code 22. Before the CEL go on, the car pull strong, Vtec kick hard. After that, the car still run strong, but no Vtec. What could be the cause? Thanks for the reply!!</TD></TR></TABLE>

I had the same problem with my P28. To get rid of the code you can connect pin D6 (VTEC pressure switch) to pin A4 (VTEC solenoid). This must be done at the ECU. Leave the solenoid wire alone after you cut it. Basically you are taping pin D6 into A4. THis tricks your ECU into thinking the Vtec has the proper oil pressure.

The downside to this is, you have to always maintain a visual check on your oil. This gets rid of the built in fail safe in the ECU, but it will solve your problem. I've been running mine like this for over a year with no issues.

 

No, I don't have the V-AFC.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hondasaurs &raquo;</TD></TR><TR><TD CLASS="quote">

I had the same problem with my P28. To get rid of the code you can connect pin D6 (VTEC pressure switch) to pin A4 (VTEC solenoid). This must be done at the ECU. Leave the solenoid wire alone after you cut it. Basically you are taping pin D6 into A4. THis tricks your ECU into thinking the Vtec has the proper oil pressure.

The downside to this is, you have to always maintain a visual check on your oil. This gets rid of the built in fail safe in the ECU, but it will solve your problem. I've been running mine like this for over a year with no issues.</TD></TR></TABLE>

So basically I just leave the D6 pin alone. Taping that "use to be" D6 line into the A4 pin right? Thanks again for the replies!!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PaintStripper &raquo;</TD></TR><TR><TD CLASS="quote">No, I don't have the V-AFC.

So basically I just leave the D6 pin alone. Taping that "use to be" D6 line into the A4 pin right? Thanks again for the replies!!
</TD></TR></TABLE>

Take D6 from the ECU plug and connect it to A4 on the ECU plug wire with a T-tap or solder it in there.

 

Thanks Hondasaurs!! I tried it your way, so far the CEL have not been on yet. Bt I haven't been Vtecing either. Hopefully the CEL stays off. Thanks again for the replies!!