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Hi all, been a long time ETCG fan since video #1, but rarely on here. But here goes my Q:
I have a 2000 accord with a P1456 code (Manual, 167,000km). This = EVAP code and on these cars its usually the following:
1. Gas cap
2. Evap solenoid or evap canister
3. Leak in the lines, gas tank, etcSo I took this car to honda to have this diagnosed and they discovered the tank was leaking. The leak is right below where the filler tube connects to the tank. Now my question is, would this leak in the tank cause this code to occur?
I mean when the tank is full, the leak/seeping section of the tank is under gas. The tank doesn’t drip or leak bad, its more of a soaking spot on the tank. But if the tank is full how can i get this code when the leaking part of the tank is under liquid as this is a EVAP error?
One person mentioned that a P1456 is a leaking gas tank and a P1457 is a EVAP, but that’s not what found when looking up the code. Also is it possible to cap the EVAP to keep the check engine light off until i have the tank replaced?
Your thoughts?
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There’s vacuum in the tank. If there is leak it will suck in air and then there’s less vacuum and you get evap code.
Make sure the gas cap is tight or replace it with a new
Honda OE cap. reset the code and see if it returns. If not
your good. If so then The tank leak is suspect. If the tank
gets low enough with sloshing it is possible to get air and
break vacuum.Forgot to mention that I bought a new gas cap already from Honda. I guess the sloshing of gas around in the tank allows vapor in/out and thus causes the code.
Does anyone know how many km the ECU has the EVAP activate? (ie – why it takes so long for the check engine light to come on?)
thanks
[quote=”college man” post=86462]The ecu checks once a day on morning start up.[/quote]
Weird, It takes 7+ days for the light to come on. Probably many different conditions applying to this. Could also be a IMAP/solenoid issue as well.
But thanks for your help.
[quote=”Raf99″ post=86466][quote=”college man” post=86462]The ecu checks once a day on morning start up.[/quote]
Weird, It takes 7+ days for the light to come on. Probably many different conditions applying to this. Could also be a IMAP/solenoid issue as well.
But thanks for your help.[/quote]
Thats strange , unless its pending code.
If you have a vacuum leak it shouldn’t take that long for it to come on unless you dont drive the car. I’d blame a sensor more than anything if thats the case.I just started having this same problem a few days ago with my 2001 Accord (281,000 mi). Just refueled and retightened the cap, and my plan was to wait a few days to see if the code resolves.
Your question about it taking “7+ days to show again” is explained in Honda’s Factory Service Manual, which states that the P1456 code for 98-02 Accords:
“[i]This is a two-trip code; once cleared, it cannot be
reproduced in one trip. Also, [u]certain specific driving
and ambient conditions must occur before the ECM/
PCM will complete the system checks[/u]. Additional test
drives may still not meet the specific conditions needed
to reproduce the code.[/i]”Honda’s Factory Service Manual troubleshooting method is as follows:
1. Check Gas Cap is tightened to 3 clicks
[indent]A. Replace or Tighten Cap[/indent]
2. Check Gas Cap Seal
[indent]A. Seal Damaged or Missing?
[indent]a. If Damaged or Missing: Replace
b. If Okay: Go to 3.[/indent][/indent]
3. EVAP Bypass Solenoid Valve Test
4. Vacuum Hoses and Connections TestModern fuel systems are designed to be sealed. The evap system helps manage and monitor the system and keep fuel vapors sequestered. If you have a hole in the filler neck, the code will set. It may not set right away, as evap monitors take certain driving conditions to occur before running a test. You’ll likely need to replace the filler neck and then recheck for the condition.
Good luck and keep us posted.
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