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Thread: other ECM options

  1. #101
    Accord of the Year - 2006

    guaynabo89's Avatar
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    Quote Originally Posted by carotman
    The guys on PGM-FI.org said that the knock detection in Honda ECUs wasn't so great..

    Yeah Ive been reading up on that over there. They also say it malfunctions with forged internals and is of no use for boost. Which is y I wanted it in the first place so I guess no need for it now.

    Just a obd-1 ecu and a dist that will fit.

    Now the question is which ecu will be best suited for the a20?



  2. #102

    Robs89LXi's Avatar
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    Darryl (from Openloop Motorsports) ended up with the F-22 distrubutor as about the only one that would fit. Even then, it still needed a bit of modification in the form of a small bracket. I emailed the guys at Distributor King and gave them a pic of our distributor for a match, and they came back with the same thing; the F-22. Seems like this is the best match (fitment wise) there is. They are two types; TEC-TD31U (internal coil, 90-91 Accord) and TEC-TD52U (external coil, 92-93 Accord).
    Last edited by Robs89LXi; 09-27-2004 at 06:46 PM.
    "Feed their greed with your need for speed"

  3. #103
    Accord of the Year - 2006

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    What exactly did you ask these people? You sent them a pic of the a20 dist?

  4. #104

    Robs89LXi's Avatar
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    Yeah, I sent them pics and measurements of my dizzy, and asked them for their opinion on what would be the closest match in a Honda obd-1 distributor.
    "Feed their greed with your need for speed"

  5. #105
    Accord of the Year - 2006

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    I thought the 4th gen Accords were still obd-0? or maybe just from 92 and on are obd-1. I've got to look at my 4th gen to find out.

  6. #106

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    The speed sensor modification might be problematic for the cruise control. We may need to use a diode not to interfere with the cruise signal. I'm at work not so I'll check the wiring diagram tomorrow and see if it is actually a problem.

    guaynabo89, the Accord were OBD-1 since 1990. I suggest everyone to use a 92-93 external coil distributor since the A20A already has the coil mounted externaly. this inveoles less wiring and reliability issues

  7. #107

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    why would we need to modify the speed sensor if we already have one? don't we just need to hook up our speed sensor wire to the p75(or whatever ecu we choose) pin for it's speed sensor? or are they different..?
    Greg

    1989 LX-i 2dr 5spd (R.I.P.)

    2008 CBR 600RR -- 1995 Toyota Supra NA -- 2013 Nissan Frontier Pro-4x

  8. #108

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    I would not think so. You should be able to just use the P-75 pins like you say.
    "Feed their greed with your need for speed"

  9. #109

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    Quote Originally Posted by Gregg86DX
    Here is a link to some more pin-out lists:

    http://www.g2ic.com/tegtips/engine/15.html

    There is a link on there to a spreadsheet with several ECU's, including the P72 and PR4. The PR4 should be the same as a P75 (they are both OBD1 LS Integra ECU's). If you compare the P72 and PR4, you can see they are almost exactly the same.
    i added in our ECU pinout for easier comparison of what's already there and what would need to be added. i used the pinout for the '89 ecu.
    http://www.maka-rth.com/ECU%20pinout...s plus PJ0.xls
    Last edited by maka_RTH; 09-29-2004 at 12:53 AM.
    Greg

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    2008 CBR 600RR -- 1995 Toyota Supra NA -- 2013 Nissan Frontier Pro-4x

  10. #110

    Robs89LXi's Avatar
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    Nice. Why is the P-75 pinout so elusive? I cannot find it anywhere. By the way, Greg, you working nights or what?
    "Feed their greed with your need for speed"

  11. #111

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    Quote Originally Posted by Robs89LXi
    Nice. Why is the P-75 pinout so elusive? I cannot find it anywhere. By the way, Greg, you working nights or what?
    Well most of the OBD-1 ECU's are pretty mush similar unlike the OBD-0's. AS far as I have seen the P-75, P-72, P06 are all the same just for the VTEC stuff.
    I'm your local R&D nut. Fabracting, welding, tuning and breaking my stuff so you don't have to.

  12. #112

    Mike's89AccordLX's Avatar
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    For those of you that don't know what OBD years are here they are.

    OBD 1 = All Vehicles from 1990-1996

    OBD 2 = All Vehicles from 1996-Present Year

  13. #113

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    Quote Originally Posted by Justin86
    Well most of the OBD-1 ECU's are pretty mush similar unlike the OBD-0's. AS far as I have seen the P-75, P-72, P06 are all the same just for the VTEC stuff.

    Correct. Most of the pinouts are the same. As a general reference dfor OBD1 ECU's

    A1-INJ1 INJ1
    A2-INJ4 INJ4
    A3-INJ2 INJ2
    A4-VTS VTEC solenoid
    A5-INJ3 INJ3
    A6-PO2SHTC O2 sensor (heating element)
    A7-FLR1 fuel pump
    A8-empty
    A9-IACV IAC valve
    A10-empty
    A11-empty
    A12-FANC engine coolant temp switch
    A13-MIL MIL (check engine light)
    A14-empty
    A15-ACC (a/c compressor clutch)
    A16-ALT C alternator
    A17-IAB IAB Solenoid
    A18-empty
    A19-**
    A20-PCS EVAP purge control solenoid
    A21-ICM ICM
    A22- *per Sander* Ignitor
    A23-PG1 ground
    A24-PG2 ground
    A25-IGP2 to main relay and to gound for o
    A26-LG1 gound
    B1-IGP2 to pin A25
    B2-LG2 ground to shields for CYP & TDC
    B3-**
    B4-**
    B5-ACS a/c switch
    B6-empty
    B7-**
    B8-PSPSW PSP switch
    B9-STARTER SIGNAL starter signal
    B10-VSS vehicle speed sensor
    B11-CYP P CYP -P
    B12-CYP M CYP -M
    B13-TDC P TDC -P
    B14-TDC M TDC -M
    B15-CKP P CKP -P
    B16-CKP M CKP -M
    D1-VBU Back Up Power
    D2-BKSW brake switch
    D3-KS Knock Sensor
    D4-SCS service check connector
    D5-empty
    D6-VTM VTEC pressure switch
    D7-TXD/RXD (data link connector)
    D8-empty
    D9-ALT F alternator
    D10-ELD electric load detector
    D11-TPS TPS Signal
    D12-**
    D13-ECT ECT sensor
    D14-PHO2S O2 sensor
    D15-IAT IAT sensor
    D16-VREF VREF
    D17-MAP Map Signal
    D18-**
    C19-VCC1 MAP 5V
    C20-VCC2 TPS 5V
    C21-SG1 MAP GND
    C22-SG2 TPS GND






    My contribution to the thread. Some people dont feel like following links and stuff and dont want to have to PM people for info so I'll post some here.

    Enjoy
    Last edited by Vinny; 09-29-2004 at 09:44 AM.

  14. #114

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    good stuff vin. i think we've hit on something really good here. Maybe it should be moved to project central as a sticky???
    -- Caleb --
    Nothin' 2 Old Racing

  15. #115
    Accord of the Year - 2006

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    Quote Originally Posted by NXRacer
    good stuff vin. i think we've hit on something really good here. ??
    It definately is.


    One things for certain. I'm going to dyno my car before and after attemting the obd-1 conversion to see if there is any whp diff, and compare the hp and tq graphs to see if there was any improvements across the rpm band between the two setups.

    WHich I think there should be nothing but improvements compared to the accord fi setup.
    Last edited by guaynabo89; 09-29-2004 at 10:24 AM.

  16. #116
    3Geez Veteran smufguy's Avatar
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    That is awsome fellas. You guys are fucking crazy. hehe, seems like openloop had made a great way for u guys to explore new territories. Now you guys can say, Who said my ecu dont control ignition??

  17. #117

    Vinny's Avatar
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    Someone mentioned knock sensors earlier. On the back side of the block theres a plug/Bolt just to the right and up from the oil filter housing. I'll try and posy a pic of the location later to show everyone. I'm not sure if it goes into a waterjacket or what but I'll find out when I pull it off, if I can get it off. Connect to D3 of the ECU harness plug and tadaaa

  18. #118

    NXRacer's Avatar
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    wouldnt you want to tap a hole higher up on the block that at the oil filter housing?? I'd want it as close to where the knock would be coming from i imagine. . . . .
    -- Caleb --
    Nothin' 2 Old Racing

  19. #119

    86LXItooFAST4me's Avatar
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    hey i was looking for some wiring fiagrams for this AFC i got from Sheph and came accross this: http://www.apexi-usa.com/productdocu..._safc_wire.pdf

    it was a bunch wiring diagrams for a few diff vehicals. i wasnt sure if it would help or not.
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  20. #120

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    Just up from the filter housing is about as High as you get, for the most part. A few inches higher and your in the head

  21. #121

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    Once this thread goes too big, we'll have to gather all the information on a same page.

    Regarding the speed sensor, the OBD-1 ECU is looking for a 12V quare Wave while the OBD-0 is looking for a ground...

    Anyway, I posted the link for the modification needed. I just didn't have time to look into the cruise control thing.

  22. #122

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    is the speed sensor only for the cruise control? cause i bet most poeple who are gonna be using this will have jerked out the CC a long time ago.
    -- Caleb --
    Nothin' 2 Old Racing

  23. #123

    Vinny's Avatar
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    I believe, and someone will correct me if I am wrong, that the speedo's on the 4th gens and up were electronic rather than cable driven. I think the sensor off the 4th gen tranny's only have a plug and no cable. Or so I have been told

  24. #124

    carotman's Avatar
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    The speed sensor is used by the ECU for a number of things... you cannot avoid using it...

  25. #125

    A20A1's Avatar
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    How would we convert to an electronic sensor... I don't want to use the cable, not do i want to use a cable driven speedo.
    - llia


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