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2002 Frontier P0455 code - evap system issues Forums > > 2002 Frontier P0455 code - evap system issues 2002 Frontier P0455 code - evap system issues
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Old 06-20-2013, 06:24 AM
pyronicflare pyronicflare is offline
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2002 Frontier King Cab
2006 350Z
 
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Exclamation 2002 Frontier P0455 code - evap system issues

I bought a 2002 Nissan Frontier and it has been a headache since day one. I have been trying to get the used car dealership to track down the problem but inbetween that i cant help myself and am trying to track down problems. They replaced the EVAP canister and knock sensor as it was originally throwing 3 codes one of which was the knock code the other were related to the EVAP system. After that i it still threw P0455 (Evap system gross leak) and the code reader says "no flow".

My first question is (and this is a relatively inexpensive code reader), does the no flow really mean there is no flow to the sensor or is that just some default text. Either way i have been trying to track down the problem. I cleaned the gas cap and tightened that down making sure it clicked. I tried to follow the service bulletin on blowing out the hoses of the evap system from the hood to the canister after removing them from the canister trying to make sure i didnt damage any sensors and i was at relatively low pressure (5 psi maybe ). I also took some silicone and rubbed it around allt he joints between the rubber hoses and metal hoses as the rubber hoses didnt look to bad but a bit dry and i wanted to make sure there wasnt any leaks around those joints. I am running out of ideas and i need to pass emissions.

I cant find any fuel leaks though my engine does seem to be leaking a little bit of oil...could this throw off the code? The other thing i have noticed as i continually check the codes is that the O2 sensor and Evap system display "inconclusive"...until the service engine light comes on again at which point the Evap reads "OK" but the O2 still reads "inconclusive"...about 50 miles after i cleared the codes (which i did after filling up with a full tank of gas).

HELP!!!!!!
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  #2  
Old 06-20-2013, 10:34 AM
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bennyb53 bennyb53 is offline
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2002 Altima
2002 Altima
 
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Originally Posted by pyronicflare View Post
After that i it still threw P0455 (Evap system gross leak) and the code reader says "no flow".
HELP!!!!!!
You won't have performance issue so long as the vacuum line to the intake manifold is good, no leak. You've done quite a bit checking already. Since code reader says "no flow", my first suspect is the Evap Canister Purge Volume Control solenoid valve in the engine compartment. The evap line after evap service port is connected to it, passenger side. Next is the evap canister vent control valve stuck open. it is usually open but close when computer is doig self-diagnostic. hope this helps.

Last edited by bennyb53; 06-20-2013 at 10:36 AM.
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Old 06-25-2013, 05:54 AM
pyronicflare pyronicflare is offline
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2002 Frontier King Cab
2006 350Z
 
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Originally Posted by bennyb53 View Post
You won't have performance issue so long as the vacuum line to the intake manifold is good, no leak. You've done quite a bit checking already. Since code reader says "no flow", my first suspect is the Evap Canister Purge Volume Control solenoid valve in the engine compartment. The evap line after evap service port is connected to it, passenger side. Next is the evap canister vent control valve stuck open. it is usually open but close when computer is doig self-diagnostic. hope this helps.
I am having the purge volume control solenoid valve replaced. I would think the evap canister vent control valve would be ok as its a new unit. There seems to be several other valves/filters/thingys before the evap canister shooting off from the tubing to the canister...i dont know what these are but would any of them be an issue as they seem to be part of the system but sort of branched off? Thanks for the first reply!
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