98 Civic HX with Y8 engine/ECU swap - code 65
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98 Civic HX with Y8 engine/ECU swap - code 65
start from day 1....
July 2012: I bought my 1998 Honda Civic HX
It passed emission with flying colors, no Check Engine Lights.
December 2012: The Stock D16Y5 engine threw a rod through the block.
January 28, 2013: I replaced the Motor with a full D16Y8 out of a 1998 Civic EX
I used everything off the y8 included the ecu. ( no engine harness due to previous owner using it for his b16 swap.)
February 2013: My Check Engine light is on for code 41 ( primary o2 sensor.)
I realized the HX has a 5 wire o2 sensor.
so I had to convert my 5 wire plug to a 4 wire plug using write-up which came out to a major fail.
After all the headache, I just decided to get a dx harness.
February 2013: I bought a 1998 Honda Civic DX engine harness that was running a b20.
Why?
because it has the secondary o2 sensor on the engine harness as opposed to the EX that has the secondary o2 on the cabin harness. If that makes sense.
All I did was wired in the my usual, knock sensor, vtec, vtec switch etc
March 2013: After having the car down for a minute, I got it running but now was throwing in a secondary o2 sensor code 65.
I replace the o2 sensor with a new OEM one, had the code reset, and still popped up. So, I assumed it has the header cat that went bad.
I didn't want to spend $300+ for a new one. So I just bought an after market header.
I also did a chipped OBD1 p28 with a y8 base map since I still had emissions.
July 1, 2014: I forgot about my OBD1 ecu untill I took it to emissions to find out that the computer doesn't read.
July 2, 2014
I plugged in my p2p ( obd2a d16y8 ecu) and threw the C.E.L for code 65 ( secondary).
So I went and had a new catalytic converter welded on to the exhaust system.
so now I have this system of exhaust system
July 6, 2014:
My code has not gone away even after replacing the o2 sensor AGAIN.
so I looked up the diagram to wire my secondary o2 sensor directly.
(I high ligthed the important ones for easier reading)
which are the same color as the same harness that was gratefully donated to me by a friend.
July 7, 2014:
I went on to http://www.ff-squad.com/technet/wiring.obd2a.htm for extra diagrams and used this
(edited for easier reading)
so I had them wired up the necessary spots.
I was left with one wire (blk/ylw)
which I wired into my fuse #15 under my dash ( where it belongs if you look at the highlighted diagram)
but didn't help get rid of the code.
and that is where i left the car.
--------------------------------------------------------------------------
cliff notes:
Secondary code doesn't go away!!
EX have secondary o2 wiring on the cabin harness
HX/DX/LX have the secondary o2 wiring on the engine harness
but
HX/DX/LX/EX have the same secondary o2 pin-out at the ecu as proven by ff-squad
ignore my previous post about the p2n ( hx ecu)
--------------------------------------------------------------------------
so only thing left to solve is.....
why is my secondary code ( 65 ) coming on with my p2p?
July 2012: I bought my 1998 Honda Civic HX
It passed emission with flying colors, no Check Engine Lights.
December 2012: The Stock D16Y5 engine threw a rod through the block.
January 28, 2013: I replaced the Motor with a full D16Y8 out of a 1998 Civic EX
I used everything off the y8 included the ecu. ( no engine harness due to previous owner using it for his b16 swap.)
February 2013: My Check Engine light is on for code 41 ( primary o2 sensor.)
I realized the HX has a 5 wire o2 sensor.
so I had to convert my 5 wire plug to a 4 wire plug using write-up which came out to a major fail.
After all the headache, I just decided to get a dx harness.
February 2013: I bought a 1998 Honda Civic DX engine harness that was running a b20.
Why?
because it has the secondary o2 sensor on the engine harness as opposed to the EX that has the secondary o2 on the cabin harness. If that makes sense.
All I did was wired in the my usual, knock sensor, vtec, vtec switch etc
March 2013: After having the car down for a minute, I got it running but now was throwing in a secondary o2 sensor code 65.
I replace the o2 sensor with a new OEM one, had the code reset, and still popped up. So, I assumed it has the header cat that went bad.
I didn't want to spend $300+ for a new one. So I just bought an after market header.
I also did a chipped OBD1 p28 with a y8 base map since I still had emissions.
July 1, 2014: I forgot about my OBD1 ecu untill I took it to emissions to find out that the computer doesn't read.
July 2, 2014
I plugged in my p2p ( obd2a d16y8 ecu) and threw the C.E.L for code 65 ( secondary).
So I went and had a new catalytic converter welded on to the exhaust system.
so now I have this system of exhaust system
July 6, 2014:
My code has not gone away even after replacing the o2 sensor AGAIN.
so I looked up the diagram to wire my secondary o2 sensor directly.
(I high ligthed the important ones for easier reading)
which are the same color as the same harness that was gratefully donated to me by a friend.
July 7, 2014:
I went on to http://www.ff-squad.com/technet/wiring.obd2a.htm for extra diagrams and used this
(edited for easier reading)
so I had them wired up the necessary spots.
I was left with one wire (blk/ylw)
which I wired into my fuse #15 under my dash ( where it belongs if you look at the highlighted diagram)
but didn't help get rid of the code.
and that is where i left the car.
--------------------------------------------------------------------------
cliff notes:
Secondary code doesn't go away!!
EX have secondary o2 wiring on the cabin harness
HX/DX/LX have the secondary o2 wiring on the engine harness
but
HX/DX/LX/EX have the same secondary o2 pin-out at the ecu as proven by ff-squad
ignore my previous post about the p2n ( hx ecu)
--------------------------------------------------------------------------
so only thing left to solve is.....
why is my secondary code ( 65 ) coming on with my p2p?
Last edited by S!K TEG; 07-25-2014 at 04:35 PM.
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Re: 98 Civic HX with Y8 engine/ECU swap - code 65
This looks like a communication issue because you can clear one code with one ECU and the other code with the 2nd ECU. if both of these ECU's are capable of throwing 41 and a 65 code then it is highly probable that it is a communication issue with the wiring feed to the ECU.
Do you know off hand if these two ECU's have 41 and 65 codes?
Do you know off hand if these two ECU's have 41 and 65 codes?
#7
Re: 98 Civic HX with Y8 engine/ECU swap - code 65
•P2P : 96+ OBD-2 Civic EX Coupe
What OBD1 ECU are you wanting to run? A P28? This was not in the info. Have you ran this ECU with any results? Are you using a jumper harness?
ECU Identification
http://www.hondata.com/techecuid.html
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Re: 98 Civic HX with Y8 engine/ECU swap - code 65
1. Because my hx has a 5 wire primary o2 sensor instead of the normal 4 wire.
2. Ex have the secondary plug on the cabin harness instead of the engine harness. So I eliminated that hassle of wiring in the secondary o2 by having it on the harness already.
2. Ex have the secondary plug on the cabin harness instead of the engine harness. So I eliminated that hassle of wiring in the secondary o2 by having it on the harness already.
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#10
Re: 98 Civic HX with Y8 engine/ECU swap - code 65
You apparently eliminated one hassle to gain a bigger hassle, which the EX harness may have circumvented.
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Re: 98 Civic HX with Y8 engine/ECU swap - code 65
This looks like a communication issue because you can clear one code with one ECU and the other code with the 2nd ECU. if both of these ECU's are capable of throwing 41 and a 65 code then it is highly probable that it is a communication issue with the wiring feed to the ECU.
Do you know off hand if these two ECU's have 41 and 65 codes?
Do you know off hand if these two ECU's have 41 and 65 codes?
No, p2p only throws code 65 and p2n only for code 41.
Didnt know what you meant.
#12
Re: 98 Civic HX with Y8 engine/ECU swap - code 65
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Re: 98 Civic HX with Y8 engine/ECU swap - code 65
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Re: 98 Civic HX with Y8 engine/ECU swap - code 65
In order for him to pass emissions everything needs to function. Then after he pass emissions he can plug whatever the **** he wants. Atm his o2 sensors are wired weird and that needs to be straighten out.
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Re: 98 Civic HX with Y8 engine/ECU swap - code 65
I am home now and will update my first post with pictures, diagrams and better detailed explanation. Bare with me, I am frustrated and ready to take my car out to the doons for some target shooting.
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Re: 98 Civic HX with Y8 engine/ECU swap - code 65
Is the cat located up front like the DX/LX/CX models or is it setup like the ex model. If you extended the o2 to the back you better check those wires and make sure the actual secondary o2 wire is shielded.
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Re: 98 Civic HX with Y8 engine/ECU swap - code 65
I also updated my first post to help understand the process.
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Re: 98 Civic HX with Y8 engine/ECU swap - code 65