2007 Kia Spectra EVAP Troubles - Kia Forum

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post #1 of 15 (permalink) Old 03-27-2013, 07:54 PM Thread Starter
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2007 Kia Spectra EVAP Troubles

I have a 2007 Kia Spectra EX giving a P0449 DTC (vent valve solonoid ckt).

I have made sure the gas cap is not leaking; I now have the gas tank removed and the EVAP/Canister system removed from the gas tank and am trying to troubleshoot.

First, where can I find an accurate description and diagrams of the emissions system (theory of operation, component descriptions and testing, etc.)?

Next, I have tested the vent valve solonoid (CCV) and it is definitely GOOD (it is normally open, apply 12V and it closes air-tight).

How can you test the fuel tank pressure sensor (removed from tank)? I checked the terminals with an ohmmeter while applying pressure/suction to the tube and I get nothing - all terminals always open (but I don't know if this is a simple resistor-type sensor or maybe some kind of semiconductor or something making this an invalid test).

I blew a lot of dust out of the vent filter, but I don't think it was stopped up. What about the charcoal canister and auxilary canister (how to tell if they might be bad)?

I have not checked to make sure all the trigger signals are present - have to do that when I get it all back in the car.

Any advice or tips on troubleshooting this system?

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post #2 of 15 (permalink) Old 02-10-2017, 09:58 PM Thread Starter
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Same PROB again in 2016-2017

Quote:
Originally Posted by rev_daddy_sp View Post
I have a 2007 Kia Spectra EX giving a P0449 DTC (vent valve solonoid ckt).

I have made sure the gas cap is not leaking; I now have the gas tank removed and the EVAP/Canister system removed from the gas tank and am trying to troubleshoot.

First, where can I find an accurate description and diagrams of the emissions system (theory of operation, component descriptions and testing, etc.)?

Next, I have tested the vent valve solonoid (CCV) and it is definitely GOOD (it is normally open, apply 12V and it closes air-tight).

How can you test the fuel tank pressure sensor (removed from tank)? I checked the terminals with an ohmmeter while applying pressure/suction to the tube and I get nothing - all terminals always open (but I don't know if this is a simple resistor-type sensor or maybe some kind of semiconductor or something making this an invalid test).

I blew a lot of dust out of the vent filter, but I don't think it was stopped up. What about the charcoal canister and auxilary canister (how to tell if they might be bad)?

I have not checked to make sure all the trigger signals are present - have to do that when I get it all back in the car.

Any advice or tips on troubleshooting this system?

I took everything all apart back then, cleaned everything up very well, problem went away for a couple of years. Now, it's back, maybe slightly more intermittent than before. MIL and code P0449 seem to come and go.

I am about to do same thing again, any suggestions before I begin???
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post #3 of 15 (permalink) Old 02-11-2017, 12:34 AM
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Run a smoke test on the system

... Philip
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post #4 of 15 (permalink) Old 02-11-2017, 06:16 AM
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From code description, it sounds to me like a poor wire connection(not just the molded plug part but individual wires in it). Or a chaffed/breaking wire in that parts wire harness.
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post #5 of 15 (permalink) Old 02-11-2017, 11:32 AM
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Quote:
Originally Posted by MIA KIA 09 View Post
From code description, it sounds to me like a poor wire connection(not just the molded plug part but individual wires in it). Or a chaffed/breaking wire in that parts wire harness.
You may be correct, but test the system first, then a simple circuit drop test..

... Philip
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post #6 of 15 (permalink) Old 02-03-2018, 01:59 PM Thread Starter
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Problem is back. It managed to go away last year for long enough to get it inspected, but shortly after, MIL came back on and has stayed on for several months now. I have this month to get it inspected, so I have to get it fixed. This kind of work has become difficult since I injured my back, but I can't afford to get fixed at dealer/mechanic. So, I am back up under the car, trying to get at the EVAP parts without fully removing the gas tank. I'll keep this thread posted on how it goes.
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post #7 of 15 (permalink) Old 02-04-2018, 01:19 PM Thread Starter
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Last time I worked on this, a thorough cleaning of all parts involved seemed to fix the problem. I live out in the country down a 1-1/2 mile long dirt road, so the underside of the car is always caked up with sand and concrete dust (because they often use recycled crushed concrete to maintain the roads here).

I am also running into a nomenclature problem. In trying to identify all the components in the EVAP system, I ran across something called a Canister Close Valve (CCV) and an EVAP vent valve - I have begun to guess that these two names refer to the same component (or else there is another part that I can't find and different troubleshooiting guides are in conflict with each other) - any thoughts?
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post #8 of 15 (permalink) Old 02-04-2018, 01:30 PM
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Yes...they are 2 different parts. Have you actually scanned the computer for actual code(s) to KNOW for sure that it is EVAP related, or are you guessing it is the same concern?
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post #9 of 15 (permalink) Old 02-08-2018, 12:36 PM Thread Starter
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Quote:
Originally Posted by MIA KIA 09 View Post
... Have you actually scanned the computer for actual code(s) to KNOW for sure that it is EVAP related, or are you guessing it is the same concern?
I have a scantool and I am reading a P0449 code- when I had the same problem a few years ago, I had also taken it to Autozone and they read the same P0449 code. I have done goo-gobs of research since then and I have learned a lot about the components and general operation of the EVAP Control System. I have become fairly confident that the generic component called the "vent valve" has many different names according to various manufacturers and is called the Canister Close Valve (CCV) in Kia language (I have read enough functional descriptions, both generic and Kia, and seen that 'these' components perform the same function and are located in the same position in the system).

The biggest remaining question I now have is what condition-circumstance actually sets the P0449 code? I have run into conflicting data on this point. Some sources say it is purely an electrical condition (ECM detects an open/short circuit or excessive/insufficient resistance in the CCV solenoid, i.e., solenoid open or wiring problem). Other sources say it is result of a failed leak test (pressure/vacuum differential failure). But if the latter were the case, it seems to me that there should be other DTCs that accompany the P0449 (which I do not). And it also seems that different manufacturers have slightly differing conditions that set a P0449.

I have also learned (I think) that the CCV is only employed in system diagnostics that test the integrity of the EVAP system (i.e., a leak test). Then the next biggest remaining question is when do these diagnostics take place - IOW, when does the ECM send the energizing signal to the CCV to close it? I do not have an advanced scantool that will command the ECM to energize the CCV, so I need to discover when the ECM will naturally energize the CCV so I can troubleshoot the electrical circuit between the ECM and CCV (I don't have any schematics or wiring diagrams for this car, either). There are two wires that go to the CCV; one is 12V, other is an open-collector output of the ECM which goes to ground to energize the CCV. Exactly when is this signal activated?
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post #10 of 15 (permalink) Old 02-08-2018, 12:39 PM Thread Starter
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