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Discussion Starter · #1 ·
So I am getting an 'Evap Not Ready' code and my '12 IQ won't pass inspection.

What are some of the things I need to do in order to clear this check?

Micky
 

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Discussion Starter · #3 ·
It shows 3 permanent codes,
P0456 (I can clear this one but it comes back)
P0455
P0441

Jeez, I hope my converter isn't shot...
Micky
 

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Looks like there's an easy solution to try:

Check if the gas cap was not tightened properly.

If it was replace cap with a new one.

Please follow up with how this goes...

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So I am getting an 'Evap Not Ready' code and my '12 IQ won't pass inspection.

What are some of the things I need to do in order to clear this check?

Micky
Did you have the battery disconnected recently? It usually takes a few days of mixed driving for all the systems to re-learn and become 'test ready', EVAP being one of them. There are also drive procedures online that you can follow to get it ready in 1-2 hours, but I don't remember which one I ended up using for my test. Basically drove around with a laptop observing evap statuses in streamtech. One of them took a very long time to become ready.

That said, if you are seeing 'check engine' codes, your problem might be different.
 

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Discussion Starter · #8 ·
Replaced the gas cap and cleaned and tested the purge valve.
No change. Here is what I get:

Car Scanner ELM OBD2
DTC report
Selected brand: Scion
VIN: JTNJJXB06CJ013790

============1==============
P0456
Raw code: 0456
ECU: Engine control unit[Archive (inactive)]
Status: Permanent
OBDII: Evaporative emission (EVAP) system - very small leak detected

============2==============
P0455
Raw code: 0455
ECU: Engine control unit[Archive (inactive)]
Status: Permanent
OBDII: Evaporative emission (EVAP) system - large leak detected

============3==============
P0441
Raw code: 0441
ECU: Engine control unit[Archive (inactive)]
Status: Permanent
OBDII: Evaporative emission (EVAP) system - incorrect flow detected

============4==============
P0113
Raw code: 0113
ECU: Engine control unit[Archive (inactive)]
Status: Permanent
OBDII: Intake air temperature (IAT) sensor - high input


I am gonna have to investigate methods of getting it test ready, as I am running the risk of a ticket each time I take it out to try and get things to reset.

One more purge valve solenoid yet to remove and test, as soon as i can find it...

Micky
 

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Discussion Starter · #10 ·
Is there a check engine light? Wondering why there's "inactive".

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These are 'permanent' codes. Codes that only the ECU itself can clear over time.
There is no Check Engine Light codes (after I cleared them) only these that remain.

I use Carista to diagnose the codes, there are other apps for OBDII diagnosis but I haven't found the 'right' one yet that will give me the pertinent info I need to clear these codes, and possibly reset the Evap ECU to a 'ready' state.

I believe the problems I have are tied to the canister purge valve and the CO2 sensor.
I'm just trying to get this ready before snow flies so the wifey can drive it to work on nice days. We have a 4Runner with studded snows for bad days...

Micky
 

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I'll check what I've collected to see if I can find this drive pattern to clear. On vacation but flying back home today, so by tomorrow...

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Okay, I found something.

(You’ll likely need a Techstream software unit. I read about some on PriusChat that are really cheap from Amazon…)

Document: 1NR-FE ENGINE CONTROL: SFI SYSTEM: P0455,P0456; Evaporative Emission Control System Leak Detected (Gross Leak); 2014 MY iQ [05/2013 - ]

Check takes max 24 minutes. It consists of Techstream performing 6 steps.

Tank must be 90% or less full for leak check.

Do not run engine during.

Fuel temp should be kept below 95 degrees F.

1. Connect Techstream to “DLC3”

2. Ig-ON then turn Techstream on.

3. Clear DTCs, even if there are none shown

4. Ig-OFF wait at least 30 s.

5. Ig-ON then Techstream on

6. Enter menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode (wait to complete)

7. Enter menus: Powertrain / Engine and ECT / Utility / All Readiness

8. Input the DTC: P0455 or P0456

9 Check Result

Four possibilities: normal, abnormal, incomplete, N/A

10 Incomplete or N/A AND no pending DTC perform universal trip and check for permanent DTCs

Permanent DTC means system malfunction
No permanent DTC means normal.

Now I don’t know what the universal trip is because it is a hyperlink and need a subscription $20/2 days to be able to use them.
 

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Googled Toyota universal trip:

The driving pattern to obtain a normal judgment and the universal trip driving can be performed consecutively in the same driving cycle.

Idle the engine for 30 seconds or more.

Drive the vehicle at 40 km/h (25 mph) or more for a total of 5 minutes or more.

HINT:

It is possible to complete the drive pattern even if the vehicle decelerates to less than 40 km/h (25 mph) during the driving cycle provided that the vehicle is driven at 40 km/h (25 mph) or more for a total of 5 minutes.

Allow 10 minutes or more to elapse from the time the engine is started.

(i) Enter the following menus: Powertrain / Engine / Trouble Codes.

(j) Check that the permanent DTCs have been cleared.



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Discussion Starter · #14 ·
I found a reference and more info about the drive cycle in the service documents.

I have to first start with changing out the downstream O2 sensor. That should eliminate one 'Not Ready' monitor.
Last I checked, I had 4 'Not Ready' monitors after a short drive.
In Vermont I am allowed up to 3 'Not Ready' monitors and still pass inspection.

It is almost as bad as California, but not quite.
Next thing you know, they will be connecting a hose to the exhaust pipe...

I gotta spray down the O2 sensor with PB Blaster and then try to find a special tool.
I am gonna get the old one out first before I order a new one.
 

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If that is the case you can pass with 3 I would look at the IAT sensor and just take care of that. Those are usually on top in the vicinity of the intake. No need to lift or crawl. We still have it worse don't worry I'd have to fix all of them...
 
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