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EVAP emissions monitor not ready #4547298
10/18/17 02:54 PM
10/18/17 02:54 PM
Joined: Apr 2013
Posts: 2,557
The Northeast
mclasser Offline OP
mclasser  Offline OP

Joined: Apr 2013
Posts: 2,557
The Northeast
This is about my Pilot:

About 600 miles back, I disconnected my battery to clean up the terminals and (as expected) all the OBDII readiness monitors got reset. Fast forward to today- I went in for a state inspection and the printout said all monitors were ready except for EVAP. I still passed since the EPA allows for one unready emissions monitor during testing.

How long does it typically take for the EVAP monitor to get ready? My driving is 80% city but I've had a few 30+ mile trips on the highway. I'd think that would be enough for the EVAP test to run.


2018 Hyundai Elantra VE
2013 Honda Pilot EX-L 4WD
2002 Honda Accord EX-L

Re: EVAP emissions monitor not ready [Re: mclasser] #4547304
10/18/17 03:05 PM
10/18/17 03:05 PM
Joined: Oct 2009
Posts: 4,021
Wet side WA
JohnnyJohnson Offline
JohnnyJohnson  Offline

Joined: Oct 2009
Posts: 4,021
Wet side WA
Originally Posted By: mclasser
This is about my Pilot:

About 600 miles back, I disconnected my battery to clean up the terminals and (as expected) all the OBDII readiness monitors got reset. Fast forward to today- I went in for a state inspection and the printout said all monitors were ready except for EVAP. I still passed since the EPA allows for one unready emissions monitor during testing.

How long does it typically take for the EVAP monitor to get ready? My driving is 80% city but I've had a few 30+ mile trips on the highway. I'd think that would be enough for the EVAP test to run.


Probably not time sensitive more than likely a $500 trip to the dealership sensitive!

Last edited by JohnnyJohnson; 10/18/17 03:06 PM.

2004 Corolla 129987
Out: EDGE EP 5W-30 Bosch 3311 7156 Miles
In: Havoline Pro DS 10w-30 Purolator PureOne 3-14-19 129693
2006 Duramax 74725
Out: T6 5W-40 M1-303
In: T6 5W-40 XG9100 73705 4-22-18
Re: EVAP emissions monitor not ready [Re: mclasser] #4547331
10/18/17 03:36 PM
10/18/17 03:36 PM
Joined: Apr 2016
Posts: 815
Specific Ocean
Kibitoshin Offline
Kibitoshin  Offline

Joined: Apr 2016
Posts: 815
Specific Ocean
On most vehicles the EVAP readiness tests won't run until the fuel level is between 3/4 and 1/4 full. Also search around for a Honda specific drive cycle that can be followed so the tests can be completed faster. A rare case would be a bad EVAP component (fuel tank pressure sensor, purge valve, etc) that can prevent the tests from running.


Shin Gekiretsu Shin'ou'hou
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Re: EVAP emissions monitor not ready [Re: mclasser] #4547332
10/18/17 03:36 PM
10/18/17 03:36 PM
Joined: Jul 2011
Posts: 274
SE Michigan
MichiganMadMan Offline
MichiganMadMan  Offline

Joined: Jul 2011
Posts: 274
SE Michigan
EVAP is tricky. It doesn't have to do as much with driving as other factors. Most OEM's want the fuel tank between 3/4 and 1/4 for it to even run the overnight leak down test. You also have to drive it every day or two or the tests will time out.

I have driven close to 800 miles with a tank that had a rust hole on the top big enough to stick your finger through and not had it run the diagnostic, I didn't meet the enable criteria. There is one route I can drive near my house that will set the code almost every time if it was going to fail, it has just the right mix of things.

It's likely you didn't have the right mix of conditions on your trips for the full diagnostic to run. I wouldn't worry about it for the time being.


2015 Chevrolet Impala
2011 E-350
2008 Subaru Impreza STI
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Re: EVAP emissions monitor not ready [Re: mclasser] #4547339
10/18/17 03:42 PM
10/18/17 03:42 PM
Joined: Sep 2017
Posts: 74
On your screen
OhOMG Offline
OhOMG  Offline

Joined: Sep 2017
Posts: 74
On your screen
Originally Posted By: mclasser
This is about my Pilot:

About 600 miles back, I disconnected my battery to clean up the terminals and (as expected) all the OBDII readiness monitors got reset. Fast forward to today- I went in for a state inspection and the printout said all monitors were ready except for EVAP. I still passed since the EPA allows for one unready emissions monitor during testing.

How long does it typically take for the EVAP monitor to get ready? My driving is 80% city but I've had a few 30+ mile trips on the highway. I'd think that would be enough for the EVAP test to run.


What are the EXACT parameters as per FSM to complete that particular monitor to readiness status?

Now, that is not to be snarky.. Most people (when it comes time to be inspected) they reset the lights and drive around, though if the exact right conditions are not met, it may not ever come into readiness status. Sometimes, hey, sure, it will set. Sometimes it will not..

Re: EVAP emissions monitor not ready [Re: mclasser] #4547380
10/18/17 04:41 PM
10/18/17 04:41 PM
Joined: Sep 2007
Posts: 1,124
TX, USA
JMJNet Offline
JMJNet  Offline

Joined: Sep 2007
Posts: 1,124
TX, USA
Stating the obvious:
If the EVAP is good then eventually the code will go away which means it becomes "Ready" and DTC light is off.
If the EVAP is bad then it will continue to become a code and "Not Ready" status continue.

Unfortunately, driving cycle depends on the car mfg, in this case is, Honda.
You may want to ask in the Honda forums see if anybody knows.

Did you erase a code because of DTC light before the inspection?


  • 2017 Toyota Sienna
  • 1995 GMC Suburban 6.5L Turbo Diesel


Re: EVAP emissions monitor not ready [Re: mclasser] #4547422
10/18/17 05:58 PM
10/18/17 05:58 PM
Joined: Jun 2011
Posts: 1,831
Crawfordville FL
SilverFusion2010 Offline
SilverFusion2010  Offline

Joined: Jun 2011
Posts: 1,831
Crawfordville FL
Need about a half tank of gas. Do some mixed driving for 30 min. Park. Next day do some mixed driving again. Mine likes to pop on at low speed oddly enough. It's the code for very small leak and we don't have emissions in FL so I live with it


2010 Ford Fusion SE 3.0L V6, 181 miles M1 HM 10w-30
Re: EVAP emissions monitor not ready [Re: mclasser] #4547431
10/18/17 06:17 PM
10/18/17 06:17 PM
Joined: Aug 2008
Posts: 24,107
ON, Canada eh?
StevieC Offline
StevieC  Offline

Joined: Aug 2008
Posts: 24,107
ON, Canada eh?
I would fill it full of gas, then reset it by pulling the battery for a couple of minutes.

Drive it until the tank of gas is down to at least 1/4 left (3/4 Empty).

If it isn't ready then book an appointment with the dealership.

The reason I say reset the battery again is because I have seen ECU's do weird things when the battery is reattached because it gets improper voltage for a minute or two until the connection is tightened up.

Good Luck thumbsup

Last edited by StevieC; 10/18/17 06:18 PM.

'18 Dodge Grand Caravan GT - 25k KM - AMSOIL SS 0w20

Fear 20wt oils if you want your engine to last. smirk2
Re: EVAP emissions monitor not ready [Re: mclasser] #4547446
10/18/17 06:35 PM
10/18/17 06:35 PM
Joined: Aug 2011
Posts: 9,560
Boston, MA
HerrStig Offline
HerrStig  Offline

Joined: Aug 2011
Posts: 9,560
Boston, MA
Toyota EVAP cycle won't run if the temp is too low. Less fuel vaporization at low temps throws off the vapor pressure requirement. In my state TWO monitors can by "not ready" and the OBDII test can still be run. If you know your EVAP system is not working properly you can work around the smog test by NOT having that monitor ready, by paying attention to the weather. smile Too many folks whose cars are running well get jerked around by sensor problems... meanwhile I see S Boxes on the road every day laying down clouds of smoke. The stealers rub their hands together when someone shows up with a sensor problem.

Re: EVAP emissions monitor not ready [Re: StevieC] #4547466
10/18/17 06:43 PM
10/18/17 06:43 PM
Joined: Nov 2004
Posts: 7,867
Texas
GMBoy Offline
GMBoy  Offline

Joined: Nov 2004
Posts: 7,867
Texas
Originally Posted By: StevieC
I would fill it full of gas, then reset it by pulling the battery for a couple of minutes.

Drive it until the tank of gas is down to at least 1/4 left (3/4 Empty).

If it isn't ready then book an appointment with the dealership.

The reason I say reset the battery again is because I have seen ECU's do weird things when the battery is reattached because it gets improper voltage for a minute or two until the connection is tightened up.

Good Luck thumbsup



BAD information.

If he resets and clears the ECM then he is back to square one and waiting even longer. It is simple- the test WILL run when the right conditions are met. Keeping the tank above a 1/4 and less than full and doing extended idling will help speed the process up often times. Best bet, as mentioned is to research HONDA's criteria in their FSM and duplicate otherwise, keep driving and wait.

Re: EVAP emissions monitor not ready [Re: mclasser] #4547475
10/18/17 06:46 PM
10/18/17 06:46 PM
Joined: Aug 2008
Posts: 24,107
ON, Canada eh?
StevieC Offline
StevieC  Offline

Joined: Aug 2008
Posts: 24,107
ON, Canada eh?
If it's not ready in 1 tank of gas then it's never going to be ready. We have smog testing where I am so I'm experienced with this sort of problem.

Not bad information, based on previous experiences with "Monitors Not Ready"

wink


'18 Dodge Grand Caravan GT - 25k KM - AMSOIL SS 0w20

Fear 20wt oils if you want your engine to last. smirk2
Re: EVAP emissions monitor not ready [Re: mclasser] #4547491
10/18/17 07:04 PM
10/18/17 07:04 PM
Joined: Nov 2010
Posts: 2,845
California
Errtt Offline
Errtt  Offline

Joined: Nov 2010
Posts: 2,845
California
Instead of pulling the battery and resetting everything and back to square one, would a OBD II scan tool read and reset just the one problem code (everything else goes on as usual), and drive on a while under ideal conditions to see if it comes back? Just asking - I dunno...

Re: EVAP emissions monitor not ready [Re: mclasser] #4547492
10/18/17 07:06 PM
10/18/17 07:06 PM
Joined: Aug 2008
Posts: 24,107
ON, Canada eh?
StevieC Offline
StevieC  Offline

Joined: Aug 2008
Posts: 24,107
ON, Canada eh?
It will but it could be stuck in a loop which I have seen first hand before with codes that keep appearing or emission monitors not showing ready after prolonged periods of time.


'18 Dodge Grand Caravan GT - 25k KM - AMSOIL SS 0w20

Fear 20wt oils if you want your engine to last. smirk2
Re: EVAP emissions monitor not ready [Re: mclasser] #4547639
10/18/17 08:41 PM
10/18/17 08:41 PM
Joined: Feb 2013
Posts: 17
boston mass
thomasflaherty Offline
thomasflaherty  Offline

Joined: Feb 2013
Posts: 17
boston mass
Disconnect both battery cables and hold them together pos to neg for 1-2 mins this reset's the ecm. PS you should do a idle relearn after this.

Re: EVAP emissions monitor not ready [Re: mclasser] #4547642
10/18/17 08:42 PM
10/18/17 08:42 PM
Joined: Dec 2013
Posts: 2,853
Fort Worth, Texas
clinebarger Offline
clinebarger  Offline

Joined: Dec 2013
Posts: 2,853
Fort Worth, Texas
If it's not setting a trouble code & your able to pass OBD emissions testing.....I don't see the issue here?

I would think your Pilot is still under Emissions Systems warranty, Take it to the dealer if it bugs you that much!

Without a good scan tool to check for "pending codes" or "trip counters" & bi-directional controls to do some functional tests.....The only answers your going to get are shot in the dark guesses


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
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