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#4547298 - 10/18/17 02:54 PM EVAP emissions monitor not ready
mclasser Offline


Registered: 04/13/13
Posts: 2259
Loc: 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.
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2018 Hyundai Elantra VE -- 3K
2013 Honda Pilot EX-L 4WD -- 55K
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#4547304 - 10/18/17 03:05 PM Re: EVAP emissions monitor not ready [Re: mclasser]
JohnnyJohnson Online   content


Registered: 10/22/09
Posts: 2900
Loc: 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!


Edited by JohnnyJohnson (10/18/17 03:06 PM)
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#4547331 - 10/18/17 03:36 PM Re: EVAP emissions monitor not ready [Re: mclasser]
Kibitoshin Offline


Registered: 04/19/16
Posts: 710
Loc: Oahu, HI
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.
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#4547332 - 10/18/17 03:36 PM Re: EVAP emissions monitor not ready [Re: mclasser]
MichiganMadMan Offline


Registered: 07/18/11
Posts: 257
Loc: 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.
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#4547339 - 10/18/17 03:42 PM Re: EVAP emissions monitor not ready [Re: mclasser]
OhOMG Offline


Registered: 09/11/17
Posts: 74
Loc: 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..

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#4547380 - 10/18/17 04:41 PM Re: EVAP emissions monitor not ready [Re: mclasser]
JMJNet Offline


Registered: 09/06/07
Posts: 950
Loc: 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?
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#4547422 - 10/18/17 05:58 PM Re: EVAP emissions monitor not ready [Re: mclasser]
SilverFusion2010 Offline


Registered: 06/29/11
Posts: 1671
Loc: 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
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#4547431 - 10/18/17 06:17 PM Re: EVAP emissions monitor not ready [Re: mclasser]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
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


Edited by StevieC (10/18/17 06:18 PM)
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#4547446 - 10/18/17 06:35 PM Re: EVAP emissions monitor not ready [Re: mclasser]
HerrStig Offline


Registered: 08/24/11
Posts: 9560
Loc: 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.

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#4547466 - 10/18/17 06:43 PM Re: EVAP emissions monitor not ready [Re: StevieC]
GMBoy Offline


Registered: 11/22/04
Posts: 7713
Loc: 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.

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#4547475 - 10/18/17 06:46 PM Re: EVAP emissions monitor not ready [Re: mclasser]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
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
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#4547491 - 10/18/17 07:04 PM Re: EVAP emissions monitor not ready [Re: mclasser]
Errtt Offline


Registered: 11/14/10
Posts: 2808
Loc: 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...

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#4547492 - 10/18/17 07:06 PM Re: EVAP emissions monitor not ready [Re: mclasser]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
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.
_________________________
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'06 Hyundai Santa Fe - 535,000km - SSO 0w30 (R.I.P)

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#4547639 - 10/18/17 08:41 PM Re: EVAP emissions monitor not ready [Re: mclasser]
thomasflaherty Offline


Registered: 02/20/13
Posts: 16
Loc: 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.

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#4547642 - 10/18/17 08:42 PM Re: EVAP emissions monitor not ready [Re: mclasser]
clinebarger Offline


Registered: 12/19/13
Posts: 1990
Loc: 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
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