Ok, some background info:

b18c1 /w pr3 pistons
p72 head with itr valvesprings and cams
skunk2 manifold and itr tb

I have 4 different ECUs:

1. OBD1 P28 with some "itr" program
2. OBD2b P73 - USDM ITR ecu
3. OBD2b P72 - USDM GSR ecu
4. OBD2a p73 - 97 or 98 USDM ITR ECU

Okay, my problem that VTEC doesn't engage. Simple as that. I have no CELs and no signs of "limp" mode. VTEC works on 1-3 on the list of ECUs but not on the last one (obd2a)

I'm using undamaged boomslang harnesses on the obd1 and obd2a ecus

When I tested the obd2a ecu (one in question) the car was warm and it was plugged in for 5 minutes, if that matters.

Anyone know whats going on?

heres a pic of my car to lure u in:

 

just wondering.. did you remove the immoblizor in the OBD2B ECUS?
are you running ITR IM or Skunk2 IM??

 

did you check oil level too?

 

what year is your car? cause obd2a wont have the same wiring lay out like obd2b

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by qfast817 &raquo;</TD></TR><TR><TD CLASS="quote">what year is your car? cause obd2a wont have the same wiring lay out like obd2b</TD></TR></TABLE>
i think they are pretty much the same except he need to use the ECU jumper harness OBD2B to OBD2A.
if he uses OBD2B ECUs in his car i assume his teg is 2000-2001.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PaChiLa Leader &raquo;</TD></TR><TR><TD CLASS="quote">just wondering.. did you remove the immoblizor in the OBD2B ECUS?
are you running ITR IM or Skunk2 IM??</TD></TR></TABLE>

yes to both questions

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by qfast817 &raquo;</TD></TR><TR><TD CLASS="quote">what year is your car? cause obd2a wont have the same wiring lay out like obd2b</TD></TR></TABLE>
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PaChiLa Leader &raquo;</TD></TR><TR><TD CLASS="quote">i think they are pretty much the same except he need to use the ECU jumper harness OBD2B to OBD2A.
if he uses OBD2B ECUs in his car i assume his teg is 2000-2001.</TD></TR></TABLE>\

if you read the post it says i used a conversion harness

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by com-teg &raquo;</TD></TR><TR><TD CLASS="quote">did you check oil level too? </TD></TR></TABLE>

its fine

bump

 

why does it even matter between a p73 obd2a and a p73 obd2b? can't you just use one? lol

anyways, so i'm assuming your car is a 2000-2001 integra (obd2b) and you're using jumper harnesses from boomslang (a obd2b-&gt;obd1 and a obd2b-obd2a). i am correct so far? i know our ecu's do "need" to be reprogrammed once you plug it up. in the past i use to just leave it idling for about 5 minutes.

if your vtec is not working, i would check the jumper harness and vtec solenoid. if everything is ok, you can consider that the ecu took a ****. i would try another obd2a ecu, possibly a gsr one.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by undercoverdc2 &raquo;</TD></TR><TR><TD CLASS="quote">why does it even matter between a p73 obd2a and a p73 obd2b? can't you just use one? lol</TD></TR></TABLE>

i want to use a ITR ecu as a "stock" ecu for my setup. It will need to pass smog with that ECU. I wanted to do it with the obd2b ones, but they throw codes for immobilizers

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by undercoverdc2 &raquo;</TD></TR><TR><TD CLASS="quote">anyways, so i'm assuming your car is a 2000-2001 integra (obd2b) and you're using jumper harnesses from boomslang (a obd2b-&gt;obd1 and a obd2b-obd2a). i am correct so far? i know our ecu's do "need" to be reprogrammed once you plug it up. in the past i use to just leave it idling for about 5 minutes.</TD></TR></TABLE>

i'll try letting it idle for a bit


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by undercoverdc2 &raquo;</TD></TR><TR><TD CLASS="quote">if your vtec is not working, i would check the jumper harness and vtec solenoid. if everything is ok, you can consider that the ecu took a ****. i would try another obd2a ecu, possibly a gsr one.</TD></TR></TABLE>

hopefully the ecu is good

 

is your car a obd2a or obd2b? i would think that you could pass smog with either ecu. if you're throwing a code for immobilizer, that doesn't effect smog i don't think.

i'll have to ask the guy who rewired my car for obd2b. cause i'm running on obd2b ls ecu on my ek. i'm wondering if it's ok because i'm running obd2b si harness.

 

with IMM CEL code throwing, you will still pass the smog
i had my teg throwing 3 Automatic tranny code (i used OBD2B auto ECU in my 5 speed car) and still pass..

good luck~

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by undercoverdc2 &raquo;</TD></TR><TR><TD CLASS="quote">is your car a obd2a or obd2b? i would think that you could pass smog with either ecu. if you're throwing a code for immobilizer, that doesn't effect smog i don't think.</TD></TR></TABLE>

My car is obd2b, I know its possible to pass smog with the obd2a ecu. I don't want to use the obd2b itr ecu because of that little added security of the check engine light because if sometimes does go wrong, i wouldn't know about it till its too late

 

go borrow another OBD2A ITR ECU and try it..
worst case, you can use OBD2A or OBD1 nonVtec LS ECU to do smog
nonVtec ECU will work on Vtec tegs just no Vtec and don't go crazy on it once you pass smog then swap your chipped ECus back..
good luck

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PaChiLa Leader &raquo;</TD></TR><TR><TD CLASS="quote">go borrow another OBD2A ITR ECU and try it..
worst case, you can use OBD2A or OBD1 nonVtec LS ECU to do smog
nonVtec ECU will work on Vtec tegs just no Vtec and don't go crazy on it once you pass smog then swap your chipped ECus back..
good luck </TD></TR></TABLE>

yeah, i guess i'll try looking around for a obd2a vtec ecu

 

perhaps the OBD2a ITR ecu isn't an ITR ecu, but an LS ecu rebadged or the internals were swapped out, hence the reason for VTEC not kicking on....or do you know for a fact that the OBD2a ITR ecu is a legit ITR ecu?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Katman &raquo;</TD></TR><TR><TD CLASS="quote">perhaps the OBD2a ITR ecu isn't an ITR ecu, but an LS ecu rebadged or the internals were swapped out, hence the reason for VTEC not kicking on....or do you know for a fact that the OBD2a ITR ecu is a legit ITR ecu?</TD></TR></TABLE>

what doyou mean by legit ITR ECU?? besides, can ppl chipped OBD2 ECUs now? i always thought only OBD1 ECu can be chipped.. anyways~

 

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

what doyou mean by legit ITR ECU?? besides, can ppl chipped OBD2 ECUs now? i always thought only OBD1 ECu can be chipped.. anyways~</TD></TR></TABLE>

click on the link below and take a looksy at definition #4 :
http://dictionary.reference.com/browse/legitimate

OBD2 ecu's are still unchippable by many, at least here in the US.

 

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

click on the link below and take a looksy at definition #4 :
http://dictionary.reference.com/browse/legitimate

</TD></TR></TABLE>


lol funny


clean car

 

wow, i just solved the problem, very stupid/shady

so i got the ecu from ebay, sold as a 98 itr ecu with a obd2b=&gt;obd2a conversion harness. I bought it and it arrived. then i ran into the problem described above. after reading katman's reply, i finally cracked it open () and theres a wire soldered from one side to the other on the backside of the circuit board. WTF to make it worse, there was hot glue all over it to prevent the wire from moving so i removed it and it works fine now

thanks all for the help

 

damn, you should've taken a picture. hahaha. i'd message that old seller. give him a

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by milano2kdc2 &raquo;</TD></TR><TR><TD CLASS="quote">after reading katman's reply, i finally cracked it open () and theres a wire soldered from one side to the other on the backside of the circuit board. WTF to make it worse, there was hot glue all over it to prevent the wire from moving so i removed it and it works fine now</TD></TR></TABLE>

wow, that sounds real shady.
I wonder why that wire does

glad to hear you figured it out tho

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by undercoverdc2 &raquo;</TD></TR><TR><TD CLASS="quote">damn, you should've taken a picture. hahaha. i'd message that old seller. give him a </TD></TR></TABLE>

i remembered to take a pic while i was desoldering the first end:



<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Katman &raquo;</TD></TR><TR><TD CLASS="quote">wow, that sounds real shady.
I wonder why that wire does

glad to hear you figured it out tho </TD></TR></TABLE>

yup, thx for the help to all of u

/thread