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ECU part # question

Discussion in 'ECU's, Electronics, and Tuning' started by CivEk4, Jan 9, 2005.

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  1. CivEk4

    CivEk4 Junior Member

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    I am trying to find out what ECU is part # 37820-P72-A05 I currently have a 37820-P72-013 (JDM GSR OBD2a) and i'm looking for a backup for quick and easy replacement. What ECU is the A05? I've been trying to find a site that has all ECU part #'s listed which would be the easiest way to answer my question, but not having any luck with that.
     
  2. AllMotorMonster

    AllMotorMonster Senior Member

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    I believe it is a 99-01 GSR OBD2B ecu, North America model
     
  3. jamesA

    jamesA Well known pissed off telephone guy VIP

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    From the ECU list in the reference section.

     
  4. CivEk4

    CivEk4 Junior Member

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    Where does that tell me what the part # is? Also where does it distinguish between JDM and USDM? There are many different P72 ECU's.
     
  5. pissedoffsol

    pissedoffsol RETIRED

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    in 88-91 ecus (PM6, PR4, PW0, PR3, PM7):
    5spd = 000, 001, 002, A00, A01, A10, J00, J001, C01, C00
    Auto = J51, J50, A50, A51, 901, A60, C50, C51, X30, A80, L50, L51

    92-5 ECUs (P28, P30, P61, P72, P91, P08)
    5spd = 000, 001, 002, 003, A00, A01, A02, C00, C01, C02, J00, J01, J02, G00, G01
    Auto = J50, J51, 901, 902, C50, C51, C52, A50, A51, A52, L50, L51, G51

    96-00 ECUs (P2E, P2P, P2J, P72)
    5spd = 000, 001, 002, 003, A00, A01, A03, C00, C01, C02, C03, J00, J01, J02, A11, C11
    Auto = A70, A71, A72, A91, A92, C70, C71, C72, C91, C92

    from the patterns we can learn the following:
    first letter = country of orgin
    J = Japan
    C= Canada
    A=USA
    G=Europe
    second digit, if 5, 7, 9 then ecu is auto usually
    third digit denotes the version/variation
    L = California emissions or typically high altitude states as well.
     
  6. CivEk4

    CivEk4 Junior Member

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    The above list still does not clarify whether or not it's OBD-1 or OBD-2a vs. OBD-2b and also does not list the A05 or 013 which are the two i'm trying to compare I know the P72-013 is the OBD-2 JDM GSR. Nobody knows where the Honda bible is that has the part # information? I've seen it somewhere before but cannot remember where I saw it.
     
  7. pissedoffsol

    pissedoffsol RETIRED

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    You can tell the obd by simply looking at it.

    [​IMG]

    2B
    2A
    1
    0

    FROM top to bottom as pictured
     
  8. CivEk4

    CivEk4 Junior Member

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    I am aware the difference can be seen by looking at it but i'm trying to be 100% sure because i'm trying to buy one and the only way to be 100% sure would be by the part #'s. I cannot trust someone to get it right by explaining to them how it looks. The JDM vs. USDM GSR looks the same for OBD-2a but the part # verifies the difference without error. I need the JDM OBD-2a because I only have 1 O2 sensor and if I get the USDM I will have a problem.
     
  9. projekteg

    projekteg Senior Member

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    that IS A USDM 5 spd, p72, you don't need a honda parts catalog to verify this, if you look at what sol posted, you could have figured it out. there are no questions about it, it is usdm.............
     
  10. CivEk4

    CivEk4 Junior Member

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    Ok, first of all I did say I did not have the ECU in front of me and I cannot trust someone to get it correct just by explaining over the phone what to look for. Although based off the part # information would tell me exactly what it is and distinguish between JDM vs. USDM, OBD-2a vs. OBD-2b, and do it without any error as long as the ECU is untouched internally. Also where in the information posted does it tell me that my current ECU (37820-P72-013) is JDM OBD-2a? The whole purpose of this post and the reason for asking for specific parts #'s is because I need to have a stock ECU that will plug right up without adapters and work with my 97' JDM B18C. I also need this ECU to be stock internally and I need to base this search off part #'s which is the sure fire way to get it right the first time.
     
  11. CivEk4

    CivEk4 Junior Member

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    OK I found the information I needed for everyone's future reference here is the link to what I was looking for which tells me without a doubt by the part #'s which ECU belongs to which motor and will distinguish the difference between USDM vs. JDM and OBD-2a vs OBD-2b. I would like to thank everyone for their help though.

    http://www.pgmfi.org/twiki/bin/view/Librar...DefinitionCodes

    Based off of this list the only one that is compatible with my motor without modifying ECU or my current setup would be the P72-Q13 as long as it only requires 1 02 sensor. So therefore i'm pretty limited to what I can use as a stock replacement.
     
  12. projekteg

    projekteg Senior Member

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    it would be much easier and just as cheap to just get an obd2 -> obd1 conversion harness so that you can use any obd1 manual ecu, that way you're not so limited trying to find one particular ecu for 1 o2 sensor.
     
  13. CivEk4

    CivEk4 Junior Member

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    Yeah, I know it would be cheaper and possibly easier but unfortunately I have to keep it stock and without OBD-2->OBD-1 conversion so that makes my options very limited now I guess. Oh well, time to hunt down another P72-013.
     
  14. seephor

    seephor Member

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    another P72-013? well could I say you are just in luck? I recently bought a JDM swap and got that ECU. Like yourself, I spent a lot of time trying to figure out exactly what ECU it was (obd wise) and yea I found out it was JDM OBD2a BUT, a big BUT that is, the ECU is considered OBD1 according to US standards. This is because there are a few things missing. The things missing from that ECU are of course the 2nd heated o2 sensor. the CKF (crankcase fluctuation sensor), the EVAP purge solenoid (emissions) and the VTEC pressure switch. some of these nonsense emissions components aren't used in japan so they aren't built into the ECU. I'm converting the motor to USDM spec which means I bought a USDM P72-A03 ecu (which I think is for a 97 gsr), so I won't be needing this JDM ecu anymore. The ECU looks visually like it's been through a lot but I'll refund you 100% if it doesn't work. And according to acura, a p72-A05 belongs to a 00-01 USDM GSR. My email is seephor@hotmail.com if you want to contact me. good luck
     
  15. CivEk4

    CivEk4 Junior Member

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    Well, I picked up a P72-013 off Ebay which appears to be in great shape for only $61 shipped. Couldn't have done a conversion harness and ECU for less than that.
    :D B)
     
  16. projekteg

    projekteg Senior Member

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    wow, sweet deal :eek: i'll give ya 62 shipped for it ;)
     
  17. nitroso84

    nitroso84 New Member

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    i have the same problem i just got a 95 jdm gsr and i dont know how to tell if the ecu they sent me is jdm or usdm the number is a37820-p72-003 i have no leters except on the bottom right corner it says (as) wut does that mean? pls help and i know is a obd 1
     
  18. tuco1power

    tuco1power New Member

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    can you plz help and tell me what engine this ECU belongs to P72-003
     
  19. tuco1power

    tuco1power New Member

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    what motor this Ecu belongs to P72-003
     
  20. eg6sir

    eg6sir Supa Mod Moderator VIP

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    what the fuck n00bs?? read the date before posting damnit!
     
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