I disconnected this sensor a few years back, but left the sensor connected to the cable. When the sensor is connected everything is fine; when the wire is broken or the sensor is missing (as it is now) I get the CEL.

I think it was connected to the intake, but don't remember for sure. This is not the original location but not far from it. Does anyone recognize what sensor was on this cable? Can I simply bridge the wires to bypass the sensor, or do I need to replace the sensor (in case it gives a measurable readout to the ECU)?

Thanks in advance.

 

wild guess here because i have an early AP1, but intake air temp sender?

 

It looks like the air control valve, it's only an emissions thing but it needs to be connected to not throw a code.
Unless you got a standalone ecu or one of those izze air pump simulator things.
It's #2 in this diagram 2003 Honda S2000 2 Door S2000 KA 6MT vacuum tank - HondaPartsNow.com

 

Thanks!

I do have the Izzy Engineering simulator, but the CEL is on anyway. My car is not street legal any more, so I don't care about the emissions test. Though I like the CEL to be off in case there are real issues. I'll tie the two wires together and clear the alarm and see if the CEL stays off.

 

You sure that CEL is ACV related? 100% certain?

Next question, you sure your IZZE simulator is wired correctly or isn't faulty?

 

Pull the CEL code to be sure. It's unlikely the simulator is faulty, we've never had a single unit fail.

As already pointed out, it looks like the 2P connector for the vacuum solenoid that opens and closes the air injection valve. Don't let that harness short to ground (the red OEM wire in particular), doing so will destroy the ECU and it will throw P0411 until the ECU is replaced.

Caleb