Hello, you could try doing an idle relearn procedure for the ECM since you cleared the codes (first diagram below),
2nd is the Monitors Readiness and how to check if they have completely with just watching the check engine light at Key On, engine Off.
And the 3rd diagram is for the criteria for the Catalytic Converter monitor, then 4th is the Evap monitor, The Evap monitor can be the one that's more difficult on some vehicles, this one looks to be based mostly on Engine coolant temperature (there's 2 temperature sensors), MAP sensor reading which will be lower than 14in Hg at idle and then Intake Air temperature sensor which is a pretty wide range 32f to 212f. And the vehicle sits still while idling. It will also run part of its monitor even after the vehicle is off for up to 40 minutes. This is usually a vapor generation type of check on the gas tank. I don't see anything about the fuel level in the tank for this criteria, on some makes it need to be between a certain level, but it's not mentioned in service info here.
And as for the EGR valve, I don't see one on the 4-cylinder Accord.
If no codes are setting, then more drive time is needed for the Catalyst monitor, you could also watch the rear Oxygen sensor voltage, B1S2 it should stay pretty steady while cruising, not fluctuating like you would see under the Global OBD2 live engine data for the front Oxygen sensor (B1S1) voltage.
But really it's the criteria you need to watch for each specific monitor to pass those two you need to get through, hopefully this helps some. See if the idle relearn helps, it looks like everything is cleared when you clear a trouble code on this vehicle. So that might help bring the idle back into the correct range if it's off.
https://www.2carpros.com/articles/smog-test-inspection-information
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Sunday, July 21st, 2024 AT 12:13 PM