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Connection problems with check engine light port? (wont read codes)

 
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Old 08-13-2013, 10:01 PM
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Connection problems with check engine light port? (wont read codes)

I'm having problems with the harness you plug into located on the left of the passenger side under the dash. I'm throwing a check engine light but I'm pretty sure it's just a p420(it used to work before). I hook up the code scanner to check/clear the code but for some reason theres a flaw some where in the connection and it wont read them. I've checked and sprayed all of the connections with deoxIT and they look to be in place. My inspection is expired and I need help..
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Old 08-13-2013, 10:49 PM
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Re: Connection problems with check engine light port? (wont read codes)

Look at the connector and see if any wires have been pulled out of the connection. Try the paper clip method and see if that works also.
Another DIY ATTS, ABS, & CEL (Check Engine Light) DTC - Honda Prelude Forum - Prelude Online.com

Have you tried resetting the ecu to see if it goes away long enough for you to go and get your inspection? Remove youe negative battery cable for a few minutes and put it back on, or pull the 7.5 clock fuse under the hood and put it back after a minute.
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Old 08-14-2013, 08:10 AM
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Re: Connection problems with check engine light port? (wont read codes)

I did check the connector and gave each wire a poke with a dental pick and they were secure. Yes, I have reset the ecu and it will stay off but they still wont be able to hook up a scanner, enter my VIN, and check my codes which I've been told is required by law. Is there a fuse that my be blown? Has anyone else had this problem.

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Old 08-14-2013, 12:06 PM
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Re: Connection problems with check engine light port? (wont read codes)

I've never had this issue, I don't believe there is a fuse for it but taking a look at the under dash fuse panel would be the best way to find out. Have you tried the paper clip method yet? It could be your scanner if your able to pull the codes with the paper clip.
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Old 08-14-2013, 01:19 PM
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Re: Connection problems with check engine light port? (wont read codes)

No, I don't need to pull codes. I just need to find the flaw in the connection to pass my inspection. I don't personally own a scanner but I have been to a few different auto parts places and tried different ones without any success.
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Old 08-14-2013, 03:39 PM
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Re: Connection problems with check engine light port? (wont read codes)

Hate to say it, but check the part outs for another unit.

Can you pull it apart to ensure there isn't a loose wire.
Check the connection points for crawly critters like the kind that metamorphis-ize... could be a small cacoon in the way.
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Old 08-14-2013, 11:11 PM
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Re: Connection problems with check engine light port? (wont read codes)

..... That last post is scary.... I hate insects especially spiders... Maybe one fried in there lol
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Old 08-22-2013, 11:30 AM
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Re: Connection problems with check engine light port? (wont read codes)

Bump, still no success with the issue. Just looking for more suggestions to diagnose the problem.
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