I have finished wiring up my 99 b16 with a 97 ex harness (motor not in car). I have all sensors and harness clips identified except one. The sensor is not on the engine itself, but the harness is located under the intake manifold. It a one-wire harness with blue/red color. I am looking for some input on this harness or rather the sensor it goes to. http://www.autoserve.8m.com/OBD2ab1.html According to this site, it the "ACS", but what is that.