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My son bought this 2000 civic a year ago and have been trying to figure out this dreaded p1457 evap canister code for quit a while now. ran tests a alldata suggest and it pointed to the shut valve on the canister so we changed that , but the code comes back. I did a smoke test and have found any vacuum leaks.check the purge for operation and voltage and that seems ok. the car has 99,000 on it and it does use a quart of oil about every 500 miles .I DID a compression test on the cylinders with cyls. 4,2,1, @ 132 lbs. and #3 @ 119lbs. I see hondaa has TSB for the evap two way valve and bypass valve at the fuel tank.but have not changed these out yet . Do want to just through parts at it. also changed out the pcv valve this weekend. Any Ideas what to do from here I only have an Aultell AL519 SCan tool so I dont think I can test the individual solenoids.and the evap leak test is not supported. Need help!
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[quote=”Abzack” post=114704]My son bought this 2000 civic a year ago and have been trying to figure out this dreaded p1457 evap canister code for quit a while now. ran tests a alldata suggest and it pointed to the shut valve on the canister so we changed that , but the code comes back. I did a smoke test and have found any vacuum leaks.check the purge for operation and voltage and that seems ok. the car has 99,000 on it and it does use a quart of oil about every 500 miles .I DID a compression test on the cylinders with cyls. 4,2,1, @ 132 lbs. and #3 @ 119lbs. I see hondaa has TSB for the evap two way valve and bypass valve at the fuel tank.but have not changed these out yet . Do want to just through parts at it. also changed out the pcv valve this weekend. Any Ideas what to do from here I only have an Aultell AL519 SCan tool so I dont think I can test the individual solenoids.and the evap leak test is not supported. Need help![/quote]
Have you replaced the gas cap?
Also check to make sure the hoses to the canister are tight. Reset the light.Yes, I replaced the fuel cap and tightened all the hoses and checked for cracks and leaks at the canister and the canister filter with air pressure and all seems ok.
You stated you didn’t find any vacuum leaks but that’s not exactly what you’re looking for. You’re looking for leaks in the evap system. Normally you hook the smoke up and activate the solenoids to see if they’re functioning properly and sealing. If you can get hold of a service manual it can walk you through the procedure of checking that system for leaks.
How the engine is running or it’s compression has nothing to do with the operation of the EVAP system.
Keep us posted.
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