Join Date: Jan 2010
Location: Fountain Valley California
With the understanding that the service manual information is correct, you can expect to see this >>>> Any of the many fault codes that are classified as an A or B rated fault, turns on the MIL light. It will remain on until the car has completed 4 *consecutive* start/run cycles without detecting any problems with ANY of the A an B rated items. So if you do something that may/feel corrected the problem, you would have to wait for those 4 run cycles before you would see that light cancel. Or you hookup a scan reader device, an force a reset. That would cancel the light right away.
Added thoughts >>>> I'm thinking that whenever you have a scan/fault reader force a reset, all the monitored emission devices, are forced to start their testing over from scratch. Most are tested an reestablished quickly. But the EVAP portion can take quite a while to get back to its ready status. But since that monitored function happens to be the circuit having the problem here, a reset probably would be the quickest way to see how the system is working now.
Makes me wonder if all of the continuously adjusting functions of the fuel trims an transmission shifting action etc (based on how it senses the driver using the cars gas pedal an trans, so to speak) are also reset to zero an have to start over again after a scan/reader reset command has taken place.
Last edited by GOPHERIT; 09-20-2018 at 01:31 PM.
Reason: added thoughts