Wiring problem crx 90

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Old Oct 1, 2018 | 08:51 AM
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Sandra Khouri's Avatar
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Default Wiring problem crx 90

I was wondering if any one could help me with my b20b motor connected to a 91 Integra computer. I can’t seem to find the computer pin out for the Integra any where and the previous owner didn’t wire the car problem I have sensor not connected and wires that are brocken engine light is on I even have a toggle switch to start my fuel pump. I’m at a lost if any in could help please I would appreciate it
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Old Oct 1, 2018 | 09:01 AM
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Default Re: Wiring problem crx 90

First, identify exactly what ecu you have. There should be a number on it, with something like "PR4" somewhere in the middle of it. Post a picture if you can.
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Old Oct 3, 2018 | 04:35 PM
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Default Re: Wiring problem crx 90


This is the computer in my car. Does this help any one
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Old Oct 6, 2018 | 04:07 PM
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Default Re: Wiring problem crx 90

I have a 37820-pr4-a10 computer I know this is the one for the swap but what I don’t know is there any wires I need to change at the computer or even for start up to work normaly
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Old Oct 8, 2018 | 05:19 AM
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Default Re: Wiring problem crx 90

The OBD1 ecu pinouts are all pretty much the same I believe.... question is what chassis are you plugging it into?

.:FFS TechNet : OBD1 ECU Pin out Schematics :.
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Old Oct 8, 2018 | 06:09 AM
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Default Re: Wiring problem crx 90

I’m pluginfg into a b20b motor non vtec. But I was told that my computer was a OBD0 not OBD1 found the pins for the two computers and noticed several pins that don’t go to the same sensors. What I don’t understand is why the swap is supposed to be a simple plug and play and I’m not getting that. Have you done one of these swaps? Are you able to guide me in the right direction. I appreciate you taking the time to answer my questions.
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Old Oct 8, 2018 | 07:39 AM
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Default Re: Wiring problem crx 90

Originally Posted by Sandra Khouri
I’m pluginfg into a b20b motor non vtec. But I was told that my computer was a OBD0 not OBD1 found the pins for the two computers and noticed several pins that don’t go to the same sensors. What I don’t understand is why the swap is supposed to be a simple plug and play and I’m not getting that. Have you done one of these swaps? Are you able to guide me in the right direction. I appreciate you taking the time to answer my questions.
If you are going from OBD0 to OBD1 your best bet is to buy a conversion jumper harness. Then it does become simple "plug and play".
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Old Oct 8, 2018 | 05:59 PM
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Default Re: Wiring problem crx 90

But I’m not going from obd 0 to obd 1 I’m staying obd 0. I might be miss informed so I will thank all that have tryed to help me to this point and I will do some more home work on the computer and the wiring. Once again I thank you.
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Old Oct 9, 2018 | 07:34 AM
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Default Re: Wiring problem crx 90

Per this thread https://honda-tech.com/forums/engine...4-ecu-1852642/ the PR4 you have is indeed OBD0 - not surprising that 2x0 thought you were going OBD1 with that setup, I would have as well.

Anyway. http://www.phearable.net/information...-pin-outs.html that was surprisingly easy. Hope it helps.
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Old Oct 9, 2018 | 10:39 AM
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Default Re: Wiring problem crx 90

Originally Posted by scelestus
Per this thread https://honda-tech.com/forums/engine...4-ecu-1852642/ the PR4 you have is indeed OBD0 - not surprising that 2x0 thought you were going OBD1 with that setup, I would have as well.

Anyway. http://www.phearable.net/information...-pin-outs.html that was surprisingly easy. Hope it helps.

True, then again I wouldn't bother swapping anything without putting in an S300 so I can have my way with it, but that's just me....

Nice link
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