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CR-V::Clinical Rounds Routine maintenance, problems, solutions and repair

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  #1  
Old 04-04-2011, 09:09 AM
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Default P0498 - Evaporative Emission Canister Vent Shut Valve

As described in the title, I have that DTC on my CR-V (see signature for car details)

Code: P0498
Description: Evaporative Emission Canister Vent Shut Valve Control Circuit Low Voltage

I haven't found information on that code here, so probably not a very common problem. I would like to resolve that situation myself, any info/help is welcome.

I also have a very obvious symptom that is probably related to the problem, since the EVAP system sends vapor from the canister to the intake: when the car is hot and not in gear, the idle RPM goes extremely low, sometimes goes back to higher revs but sometimes stalls. I just got a new battery, so that's out of the equation.

What I'm planning to do:
  1. Find where that Vent Shut Valve is! Can't locate it on a 2002 CR-V diagram... might be different on gen 2.5.
  2. Check the connections around it.
  3. Order a new valve and replace the old one...
Sounds like a good plan? Any way to make sure that valve is really the problem before ordering one? Does looking for a used valve a good idea?
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Last edited by CR-VM; 04-04-2011 at 09:33 AM.
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Old 04-04-2011, 09:46 AM
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Let me check my 2005-2006 Honda CR-V Service Manual when I get home tonight.

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Old 04-04-2011, 10:51 AM
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Step 1 is to accurately diagnose is. A code doesn't mean that you automatically replace a part.

Parts 7, 8, 10, and 33 in this illustration are the main points of failure, as the rest of the parts are clips, fuel lines, and hoses.

On another thread, I recently posted a TSB from Hyundai/Kia regarding the mandatory replacement of the canister filter - with it under no circumstances to go past 30k miles. I have never seen any mention of the filter replacement on a Honda, but have heard of plugged canisters.

7 - canister assembly
8 - canister filter
10 - dust filter
33 - vent pressure sensor

I didn't list part numbers or prices because there are variations to the parts dependent upon where the car was built.

On GM vehicles, the most normal failure is the EVAP vent valve. I don't know what Honda calls it.
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Old 04-04-2011, 10:53 AM
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On the 1st Gens wasn't the evap canister up front, in the engine compartment?

Is it possible to "flood" the 2nd Gen evap canister with gasoline by overfilling/"topping off" the gas tank?

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Old 04-04-2011, 11:09 AM
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Quote:
Originally Posted by Racoon View Post
On the 1st Gens wasn't the evap canister up front, in the engine compartment?

Is it possible to "flood" the 2nd Gen evap canister with gasoline by overfilling/"topping off" the gas tank?

Yes - the canister is under hood on the first gen, as are the 2 valves for the system.

If it was possible to flood the evap canister by over filling the fuel tank, I would have done it dozens of times by now.
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Old 04-04-2011, 12:54 PM
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It's located in a bad, salty area down there in the back. Could be corroded connectors (possibly explaining the Valve Control Circuit Low Voltage part).

A few members have bashed them up while straddling various obstructions. Others have threatened to BASH THEM OFF to get at the drain / fill plugs on the pumpkin.

Keep in mind that you replaced the battery, so you've repeated the idle learn procedure, possibly without knowing it. Good idea to do it again per the Gen II PDI sheets.

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Last edited by 'Curly Q Links'; 04-04-2011 at 03:37 PM. Reason: Valve Control Circuit Low Voltage
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Old 04-05-2011, 05:31 AM
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Quote:
Originally Posted by 'Curly Q Links' View Post
Keep in mind that you replaced the battery, so you've repeated the idle learn procedure, possibly without knowing it. Good idea to do it again per the Gen II PDI sheets.
In an attempt to solve my idle RPM problem, I did the idle learn procedure (according to Honda instructions, thanks to this forum ) with the old battery without positive result. It's also the first thing I did after installing the new one.

I'm planning over the next week-end to "maintenance" that canister area (check for tubing connections, damage, electrical connectors, etc). We'll se how it goes after that.

I'm still curious the P0498 code refers to the "vent shut valve" and I saw no mention of it anywhere on the gen 2.5. The diagram of the gen 2 I have here refers to a "purge valve" under the hood and a "2-way valve" around the canister in the back. If someone knows what it refers to exactly on that BigIslandV pic (or anywhere else!), please let me know!
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Old 04-10-2011, 07:11 AM
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UPDATE

Ok, so I got under the car to inspect my canister system... I found out a small electrical wire cut down at the very base of a connector. From BigIslandV's pic, that connector is located on part #10 (directly attached to the #7 canister), it's not visible or listed on that diagram.

The connector itself is part of a wire harness... I don't know how I'll repair (not even a single mm of wire comes out of the connector).
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Old 04-11-2011, 08:13 AM
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Connector identified!

Sumitomo HX sealed series 040 - Female 2-way



I doubt I'll be able to buy a new connector with installed wires in it... I'll probably try to find another one in a scrapyard.
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Old 04-11-2011, 09:50 AM
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The connectors all pop apart. They're basically the same whether for O2 sensors or the ABS sensors. The O2 sensor connectors are amazingly simple, but still waterproof. The lighter colored inner part on yours probably pops out, releasing the lugs, or allowing you to push the tabs that retain the lugs.

They can be dismantled, then solder a new wire on to the lug and put a waterproof splice a few inches up the line, to the original wire.

Sounds like you've already spent $200 of your time.

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