So I have two ECUs sitting here, one is a P72 and the other is one thats supposed to be a P72... now im looking at them and one has what I believe is the knock board and the other doesnt... the one without knock board looks like it has had some sort of socket installed and has a chip (looks like all the components of a hondata chip sort of thing)

Basically, what the hell am I looking at... it sure as hell isnt a stock p72

 

Well... I took some pics for help... I chopped one for effect



New "P72" has no knock board and has a socket and chips... hmm thats shady

 

That jank ECU is J1 jumpered to use the secondary, external ROM, but the CN2 socket hasn't been added that powers and communicates with the Hondata S100 chip or S200 box.

It's just a socketed and chipped ECU.

Anybody know how to distinguish b/w a VTEC and non-VTEC ECU?

 

What is the three digit number on the largest chip (MCU) in the ECU on the right? I can't make it out in the pic.

 

332

 

It is chipped. Not Hondata though. Probably some Ebay chip. And it looks like a P28.

 

What does the 'knock board' do ? Is it the stock program or something ?

 

knock board as in knock sensor...

If my memory serves me correctly, that is what that extra board is for

 

looks like a p28 to me

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by FastSS &raquo;</TD></TR><TR><TD CLASS="quote">knock board as in knock sensor...

If my memory serves me correctly, that is what that extra board is for</TD></TR></TABLE>

Damn... that whole chunk of board for a KS ? wow...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by FastSS &raquo;</TD></TR><TR><TD CLASS="quote">332</TD></TR></TABLE>

332 = P75.

You have a P75 that was apparently converted to a P72.

 

I bet thats why its throwing a code 21 maybe?!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by FastSS &raquo;</TD></TR><TR><TD CLASS="quote">I bet thats why its throwing a code 21 maybe?!</TD></TR></TABLE>

If the good P72 isn't giving you a 21, I would assume the wrong high side switch was used to convert the P75 to VTEC. Is IC14 a 5050s or 5151s? If it's a 5050s, that explains the code 21.

http://www.pgmfi.org/twiki/bin...-1500

 

No, the real P72 is giving me the #2 injector sprays fuel constantly problem

You know your stuff, thats really neat =D

 

yea that other ecu is a P75 converted to vtec, but the guy forgot the knock board, so that is all it is. Not a p72 conversion... But it should work just fine, if you can live without the knock board. you just can't put a P72 chip in it, it will throw a code.

 

What about the IAB actuator function?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by IN VTEC &raquo;</TD></TR><TR><TD CLASS="quote">What about the IAB actuator function?</TD></TR></TABLE>

As long as it was added, it will work fine. The P72 and the P75 share the same base PCB.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93turbo16 &raquo;</TD></TR><TR><TD CLASS="quote">you just can't put a P72 chip in it, it will throw a code.</TD></TR></TABLE>

Exactly. You will need to disable the knock sensor on the P72 codebase.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by FastSS &raquo;</TD></TR><TR><TD CLASS="quote">No, the real P72 is giving me the #2 injector sprays fuel constantly problem
</TD></TR></TABLE>

That can be fixed. I have the parts in stock, as should most reputable ECU "chippers".

 

The knock sensorless board is either a P28 or a non-vtec ECU, but I can see that there are VTEC transistors on there, these ones:



(take a look at the 5speed point out. See the 2 black resistors in the background? those are the VTEC resistors, your ecu has one of those meaing it should/could have VTEC).

If you could you please post what the board number is in relation to my image regarding the ecu with no KS board:



...this will help pinpoint what ecu you could have.
P72 & P75 ecu's both use the same type of board number: 02D01998-1502

PR4(LS)/P74(LS)/P05(CX)/P06(DX)/some P07's(VX)/and all P28's (Si/EX) either use a 02D011F0-1500 or 02D01720-1500 boards.

On a side note...
Perhaps your ecu was reprogrammed with a VTEC program on a non-vtec board, yet the ecu hasn't fully been converted for VTEC use, hence code 21.

Who did you get either ecu's from?


EDIT
nevermind, I cross referenced & your KS'less ecu is a P75. blah...

 

He already stated the MCU number to be a 332. It's a p75 converted to VTEC. I assume a SI5050s was used for IC14, and because it is a lower current part than the 5151s, he is getting the code 21 error. Just looking at them I can tell they are 1980 boards. It is definitely not a converted 11F0.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jim Truett &raquo;</TD></TR><TR><TD CLASS="quote">He already stated the MCU number to be a 332. It's a p75 converted to VTEC. I assume a SI5050s was used for IC14, and because it is a lower current part than the 5151s, he is getting the code 21 error. Just looking at them I can tell they are 1980 boards. It is definitely not a converted 11F0.</TD></TR></TABLE>

yeah, I know its a 1980 board, did you see my edit at the end of my reply? heh. All good tho, hope he can get it running.