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What is this? Can't identify

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Old Dec 3, 2021
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What is this? Can't identify


In the center of this picture is something I cannot figure out. This is a 1997 Civic EX coupe. This thing has a single blue wire going to it and then it has a rubber sheath around it and it is attached to the body. It is not a button, the front of it does not push in and out, nothing comes in contact with it and it is isolated from ground. As far as I can figure it does not even make a complete circuit with anything. Someone has to know what this is.
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Old Dec 3, 2021
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Re: What is this? Can't identify

I believe I found a part number for it, it's a cap. The wire must be used on some trims (possibly overseas), but on yours it's just capped. Maybe someone else knows. Part number 91637-SF1-003.


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Old Dec 3, 2021
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Re: What is this? Can't identify

Tach signal wire. Used for diagnosis/tuning and remote starter installs
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Old Dec 3, 2021
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Re: What is this? Can't identify

Tach signal wire for diagnostics?? Are you sure? Why would they do that when you can just use the OBD port, isn't that what it is for?
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Old Dec 4, 2021
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Re: What is this? Can't identify

Because back in the day you didn't have fancy computerized obd scanners....
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