Question about 2001 Nissan Altima

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Code PO446 come up on hand held aninilzer checked hoses tapped on solinoids and vaccum vaules started light went out ran for 1/2 hour shut off put gas in restart engine light came back on

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Posted on Oct 05, 2009


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2000 buick park avenue where are the vaccum hoses located on the evap sytem my check engine wont go off codep0442

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PO440 means that the system has not created enough vaccum. the only way to test the solinoides is with a scan tool .the vent solinod will be closed by the PCM then the engine provides the vaccum at aroun ten in of water the pcm closes the purge solinoid . I would check all the hoses in the evap system for cracks and dry rott the smallest crack can lead to the light coming on and the system failing.hope this helped

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If the SES light is on, take a paper clip bend it in a u-shape and jump the scanner input positions A B. This should flash the ses in sequesces to give you the trouble code, Please see the following link. Refer to the code to see what the issue may be. SES lit means that there is a emmissions related issue. Refer to the other links for additonal information on O2 sensor resistance, and the egr valve solinoid. Check the EGR is relitive easy for operation. Remove the vaccum hose and place a hose of similar suckon the hose to pull vaccum if the diafram underneith retracts, hold the vaccum by plugging off the tube with your touge if the diafram retracts, will not hold the vaccum, it is bad. The solinoid should read 40-60 ohms if good.

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