I have a p06 converted to vtec that I bought from someone on HT awhile back. The engine is a JDM d15b vtec with a 4 wire o2 from my old d15b7.

I went through the troubleshooting on pgmfi and if I burn a chip with a stock p06 bin from this website it doesnt get a CEL. I have tried the p28 bins and they all give a CEL code 21. The troubleshooting guide says its the program if the stock non vtec program works but the vtec bin I am using is a stock program from here http://www.pgmfi.org/twiki/bin...Codes
It is the p28-a01 I am using.

I have checked the vtec solenoid and pressure switch and they are fine. I used the FSM procedure and I also tested the solenoid by jumping it and verifying the click. The wiring tests fine all the way to the ecu plug. Any ideas?

Thanks,
Aaron

 

The VTEC conversion was done poorly or is incomplete. What board is the ECU? a 1720 or an 11F0?

 

I have the same trouble with two 11F0 boards.

All components are in the right place.

 

The 11F0 and 1720 don't use the same transistor, one is PNP and the other is NPN.

May be this work for you, it was my trouble.

 

that transistor are you talking about? i have two 1720 boards that i have a problem with, one throws cel code 21 as soon as it starts and the other throws cel 21 after i hit vtec.

 

Guys, this is a 5 year old thread, I also have the same issue though, from what i've been told its either 5151S or Q26 thats bad.

 

i know the dates of the thread, but its what i came up with in my "search". both have 5151s and i redid the q26 on both. one works perfect the other throws cel after vtec