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ok their is a evap test that will need to be done at honda. this is a emission warranty item.
CHECK FUEL CAP, TIGHTEN
FUEL CAP Messages
NOTE: This article applies to '05-06 Accords,
'06 Civics, '05-06 CR-Vs, '05-06 Elements,
'05-06 Odysseys, '05-06 Pilots, '06 Ridgelines,
and '06 S2000s.
If a vehicle's fuel fill cap is loose or missing, and
the ECM/PCM detects an EVAP system leak when
it runs the EVAP monitor, the CHECK FUEL CAP
message appears on the information display when
the engine is started. (On '06 Odyssey Touring
models and future Honda models, it's the
TIGHTEN FUEL CAP message.) A temporary
DTC is also stored in the ECM/PCM's memory. If
this happens, there's really no need for the owner
to bring the vehicle in for service. All he or she
has to do is shut off the engine and make sure the
fuel fill cap is in place and it's properly tightened
(it's one or three clicks, depending on what's
written on the cap).
Although the owner can cycle the message from
the display with the reset button (the actual
button name varies by model), the temporary
DTC that's setting the message is still there. This
means the message never really goes away. It can
be cycled back with the reset button, and it comes
on again if the ignition switch is cycled or the
engine is restarted. This message keeps coming
back until the EVAP monitor runs again and it
finds no EVAP system leak. This could take several
days, even weeks, depending on how often the
vehicle is driven.
If, when the next EVAP monitor runs, the cap
wasn't tightened or there's another EVAP system
leak detected, the MIL comes on and the message
goes off. A permanent DTC is now stored in the
ECM/PCM's memory. If the owner now tightens
the cap, the MIL should go off after the next EVAP
monitor run, yet, this could still take days or
weeks. If the MIL is still on after that monitor run,
then it's time to bring the vehicle in for service.
If the vehicle comes into your shop with the fuel
cap message or the MIL on, make sure the fuel fill
cap is in place and properly tightened. Record the
DTC, then clear it with the HDS, and run the EVAP
system function test. If there's still a problem,
press on with normal troubleshooting