what are the physical differences between a jdm vs usdm itr ecu>?

 

jdm ecus are smaller then usdm ecus.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mtber &raquo;</TD></TR><TR><TD CLASS="quote">jdm ecus are smaller then usdm ecus.</TD></TR></TABLE>

joking?... maybe you saw a JDM OBDIIB ECU as opposed to a USDM 97-98 OBDIIA ECU? I could be wrong though.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by neo_ &raquo;</TD></TR><TR><TD CLASS="quote">The JDM ECUs are made by JASMA.</TD></TR></TABLE>

thanks for the info!

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

joking?... maybe you saw a JDM OBDIIB ECU as opposed to a USDM 97-98 OBDIIA ECU? I could be wrong though.</TD></TR></TABLE>

i just picked up a OBDIIA ECU and its alot longer than my stock one (99-00, civic si, P2T)..

is the OBDIIB the same size as my P2T&gt;?

 

I know my freinds 01 ITR's ECU is shorter (more square) than mine. I have a 98 ITR and the ECU is longer than his. 98 would be the OBDIIA and 01 would be the OBDIIB.

 

................................USDM.............. .................................................. JDM............................................... .......USDM

 

All jdm itr ecus are long. Longer than the 00-01 itr ecus. As far as telling the difference. You can look at the code and if its jdm it will say something like p73-013 which will refer to a 98-99 jdm itr ecu. If it says p73-A13 it will refer to a 98 usdm itr ecu. The A being the key code for American.

 

my 2001 R's ecu is small like yours in the middle and i just got P28 .. it's long like the usdm one

 

My 96spec JDM P73 is small like the one above also

 

My 98+ jdm itr ecu was full size (p28size).

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mtber &raquo;</TD></TR><TR><TD CLASS="quote">jdm ecus are smaller then usdm ecus.</TD></TR></TABLE>

My ITR is JDM and is the same size as the USDM ecu (long)

 

my JDM ITR also had the large ECU. the brackets for the ECU also fit a P28 perfectly (same size as the P73 that came out of it)

 

Interesting. All the ECUs in the pic above are also OBD I if that makes a difference.

 

I am about to replace my engine, so if I have a USDM ecu on the car will it matter if I then get a JDM engine?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by I am ten ninjas &raquo;</TD></TR><TR><TD CLASS="quote">I am about to replace my engine, so if I have a USDM ecu on the car will it matter if I then get a JDM engine? </TD></TR></TABLE>

Yes it does matter.... you will want to use a jdm P73 if you are purchasing a jdm ITR motor.

 

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

Yes it does matter.... you will want to use a jdm P73 if you are purchasing a jdm ITR motor.</TD></TR></TABLE>

Wouldnt you also wanna make sure its the same obd?? as your car? I had a 97 ek hatch with a 97 jdm itr along with a obdIIa ecu. Everything worked fine, absolutely no codes.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by walker111 &raquo;</TD></TR><TR><TD CLASS="quote">

Wouldnt you also wanna make sure its the same obd?? as your car? I had a 97 ek hatch with a 97 jdm itr along with a obdIIa ecu. Everything worked fine, absolutely no codes.</TD></TR></TABLE>

well you just need to make sure that you have the wiring correct. I used a 96-97 spec P73 on my Si, you just have to rewire it correctly to work!

 

My '96spec JDM ITR ECU was the same size as my '97 USDM ITR ECU.

 

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

well you just need to make sure that you have the wiring correct. I used a 96-97 spec P73 on my Si, you just have to rewire it correctly to work!</TD></TR></TABLE>

Word.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92TypeR &raquo;</TD></TR><TR><TD CLASS="quote">My '96spec JDM ITR ECU was the same size as my '97 USDM ITR ECU.</TD></TR></TABLE>

IMHO and from what I've seen jdm ecu's are exactly the same physically as usdm, the size is the same and change when you get to obdIIb.

 

Just to be completely clear, I am replacing my destroyed b18c1 which is USDM with the exact same but JDM, The guy at Sunrise auto says it is best to use the manifolds from the USDM so that everything matches up the same, but he says there will be no other issues, which I assume means no issues with the ECUs ie. there are identical and interchangable. So if I need a new wire harness or something it would be good to know now.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by I am ten ninjas &raquo;</TD></TR><TR><TD CLASS="quote">Just to be completely clear, I am replacing my destroyed b18c1 which is USDM with the exact same but JDM, The guy at Sunrise auto says it is best to use the manifolds from the USDM so that everything matches up the same, but he says there will be no other issues, which I assume means no issues with the ECUs ie. there are identical and interchangable. So if I need a new wire harness or something it would be good to know now.</TD></TR></TABLE>

The intake manifold should be exactly the same between the usdm & jdm swap....
Do your self a favor and install a skunk2 , aebs or blox intake manifold & get your self a chipped obd1 ecu.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tommymoose &raquo;</TD></TR><TR><TD CLASS="quote">joking?... maybe you saw a JDM OBDIIB ECU as opposed to a USDM 97-98 OBDIIA ECU? I could be wrong though.</TD></TR></TABLE>

Jdm obd1 ecus are smaller then usdm obd1 ecus hence my response.
I was not thinking obd2 :-)

 

My JDM ITR ECU is also as long as the USDM ITR ECU's in the pics above... Very interesting

 

yea the ecu in my R is tiny compared to the p28 in my EK

 

Very interesting, my 96 JDM Spec is long.