Troubleshooting codes P0497?

SOLRACOTOS

MEMBER
2005 HONDA CIVIC
1.2L
4 CYL
2WD
MANUAL
104,000 MILES

Hello

2 days ago, my car's check engine light came up. I went to AutoZone and got my car scanned. The code that came up was P0497

After doing a search I found a post on this website and a solution by @SQM (https://www.2carpros.com/questions/2005-honda-civic-engine-code-p0497#last) with the troubleshooting steps to diagnose the source of the problem. The steps are very detailed, and I appreciate SQM input. The only doubt I have is related to the steps that require you to measure voltage or jump a connector terminal to body ground. For example, if you look at the post linked above and the image containing step 1 (image #3) or step 5 (image #5); Is that action done while the connector is plugged into the ECM/PCM or should I pull the plug out and then do the required action.

The car listed above is an EX SP.

Images (Click to make bigger)

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,643 POSTS

You should remove the connector for the control unit before testing. Here is more information on the problem:

P0497 is a diagnostic trouble code (DTC) that indicates a low purge flow in the evaporative emission (EVAP) system.

Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.

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Friday, June 2nd, 2023 AT 7:43 AM

SOLRACOTOS

MEMBER
3 POSTS

I followed all the troubleshooting steps listed on the linked on my original post. All electrical components were fully functional (purge valve, solenoids, etc, ). I even took out the EVAP purge valve to double check it and its ohm readings were within specs and when necessary, held vacuum. I inspected most of the visible hoses for obvious cracks or tears but couldn't find any. I did also inspect the fuel cap and found no issues with it.

At the end, I reassembled the purge valve back into the vehicle and shortly after the check engine light went off and has stayed off. I took the car back to be scanned and the car has no active fault codes? I'm confounded by this as I really didn't do anything to "repair " the car but the code still went out. I'll keep monitoring the issue and post back if I have any updates.

Thanks for your very detailed post.

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Monday, June 12th, 2023 AT 10:42 AM

KEN L

MASTER CERTIFIED MECHANIC
47,643 POSTS

No problem, no may have had a bad connection and reassembling the components fixed the issue. Use 2CarPros anytime, we are here to help. Please tell a friend.

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Tuesday, June 13th, 2023 AT 6:09 PM