Since cleared OTCs vs This Drive Cycle?

Tiny
XJSHEN
  • MEMBER
  • 2009 HONDA ACCORD
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 159,000 MILES
After clear ‘check fuel cap’ message at board after replacement of Vapor Canister Purge Solenoid Valve, run drive cycle, activated all of 8 functions on State OBD Check, and at ‘Since DTCs Cleared’ category with Dactron code detector, and at ‘Read Code’, No Codes Found.
But at ‘This Drive cycle’ category, there were still several non-activated contents, Catalyst Mon inc; Evap system Mon n/a; EGR System Mon inc.

What should I do to activate all functions on this This Drive Cycle as activated on the ‘Since DTCs Cleared’ to pass State inspection?
Thanks for your comments and help!
Sunday, July 21st, 2024 AT 8:01 AM

5 Replies

Tiny
AL514
  • MECHANIC
  • 4,793 POSTS
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
Tiny
AL514
  • MECHANIC
  • 4,793 POSTS
Here are the monitors for the front Oxygen sensor (A/F Sensor 1) and the Oxygen sensor Heater circuit Monitor, as well as the misfire and fuel system status monitor information if needed.
This could prevent the Catalytic converter monitor from being completed if it does not run long enough.
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Sunday, July 21st, 2024 AT 12:17 PM
Tiny
XJSHEN
  • MEMBER
  • 218 POSTS
Thanks for your detailed documents and instructions. I will work on one by one and step by step following your instructions.
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Monday, July 22nd, 2024 AT 12:03 AM
Tiny
XJSHEN
  • MEMBER
  • 218 POSTS
I just ran three drive cycles then my car could pass state inspections. So many thanks to my specialists and experts who helped me so much!
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Thursday, September 26th, 2024 AT 3:08 PM
Tiny
AL514
  • MECHANIC
  • 4,793 POSTS
So glad to hear you got it through inspection.
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Thursday, September 26th, 2024 AT 8:12 PM

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