Honda Civic Performance - JDM Discussion Engine tech, forced induction, springs, shocks, brakes, tires, etc.

ECU problems

Old 24-Oct-2005, 08:14 PM
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ECU problems

i recently bought a P73 ECU, and i tried to switch my SIR ECU with that TypeR ECU since i did an engine swap. There are four slots on the SIR ecus, my OBD2 harness goes into the first, second and third slots for my SIR ecu, and for the P73 ecu, it requires the harness to goes into the first, third and fouth slots, the problem is...the first and the third harness fits into the P73 ECU, but it doesn't fit into the fouth slot, do i need some special harness?


so its like

SIR ECU Slots = 1, 2, 3, Blank
JDM TypeR ECU slots = 1, Blank, 3, 4
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Old 24-Oct-2005, 08:54 PM
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Sounds like you have a mix of OBD2B wiring harness and OBD2A ecu.
Conversion harnesses are made to convert between different generations of ECUs. Not to sound like a broken record, but try and search and see what you come up with.
Hope this helps.

Check out this thread with information courtesy of Scott-93HBSi:
http://www.torontocivics.com/tccforu...d1+obd2a+obd2b
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Old 24-Oct-2005, 09:12 PM
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thank you, i found what i need
bascially i need a OBD2b to OBD2a jumper harness
but its so rare..even ebay doesn't have them...i'm dead this time.lol
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Old 24-Oct-2005, 09:16 PM
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You have a few options, the first being to find an OBD2B ITR Ecu OR to find an OBD1 ecu and ZIF socket it to run the appropriate chip or engine management of your choice.
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Old 24-Oct-2005, 11:53 PM
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I can make you a conversion harness, but I charge $300 flat fee to do it. My work is guaranteed.

call me @ (647) 290-1848 if your interested.
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Old 25-Oct-2005, 04:06 PM
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I think I can get you one for $250 but you may have to wait for a couple days.
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