1999 Nissan Altima EVAP Leak (Code P 1440)

2 ANSWERS

1. Guest7299
   

   =) guy below- said it all.

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2. Guest7185
   

   I got this stuff researching the same question,,,here it is::::
   Automotive - 1999 Nissan Altima EVAP Leak (Code P 1440)
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   Expert: Sean Halliday - 11/30/2006
   
   Question
   Dear Sean:
   
   Thank you for very kindly for the prompt response!
   1) Any suggestions how to find the EVAP leak for do it yourself person.  I have access to a code scanner so the other option is to just keep clearing the code every 3 months or so when it appears.
   
   The text above is a follow-up to ...
   
   -----Question-----
   Dear Sean:
   
   1)    My "service engine light" has come on twice over the last 6 weeks (Code P 1440); which Nissan dealer reports is a “small evap leak;” possibly a loose gas cap.  I tightened the gas cap and cleared the code only to have it re-code yesterday (P1440).  I replaced the gas cap today and cleared the code.  I smell no gas odors or any obvious gas leaks.  Any thoughts?
   
   Thank you in advance.
   -----Answer-----
   The car possibly does have a small leak from the EVAP system so its a trip back to the shop to find it.Most times it is a loose gas cap but this time it may be a tiny hole in the vacuum.
   
   Answer.The EVAP problem is more complex as youre dealing with an explosive gas.Fuel and air mix and im sorry to say there isnt any parts store that has the equipment to find the leak.Many shops use nitrogen or lately ,,smoke.Sometimes you may hear the leak hissing but the car has to be raised on a rack as the EVAP lines run all the way under the car.From the tank to the engine compartment.Generally it doesnt cost that much to fix.Porobally a small hole in one of the rubber or PVC lines.Personaly i dont fix EVAP leaks as its a time consuming job and it is easier for a dealer to find the leak as they have all kinds of tricks to locate the leak.I would suggest you get it fixed soon because it will affect the engiine idle and start up eventually.
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   From the old FAQ:
   
   Q) How do I reset the computer and what does it do?
   
   A) It depends sometimes it does help the ECU reset itself and recalibrate itself to the environment. Disconnecting the computer is really not resetting the ECU; all the error codes that are present will still be stored. Some people also say you can disconnect the battery wire overnight, sometimes this works but usually the computer will still have everything stored. Why bother when you can reset it in 5 minutes or so. Leave everything connected, do not disconnect any sensor there. To clear all check engine light codes you need to reset the ECU. In the driver's foot well is where the computer is located behind the plastic piece by the gas pedal. Take your key and turn it to the on position. Look on the ECU, you should see a flathead s***w on the driver's side. Turn this flathead s***w completely clockwise. Wait at least 2 seconds. Now turn it back fully counterclockwise. The check engine light will then blink the trouble code. This will be useless unless you know someone with the FSM.
   
   (-UltimaSE)
   
   
   You do not start the engine ever during the procedure.
   
   
   Turn ignition key to the "ON" position but do not start the engine. (The ignition key will remain in this position throughout the entire procedure)
   
   Turn the ecu switch fully clockwise, wait two seconds.
   
   Turn ecu switch fully counter clockwise.
   
   Now you are in the trouble diagnostic mode with the check engine light blinking.
   
   To continue on to reseting ecu:
   
   Turn the ecu switch fully clockwise again, and wait two seconds.
   
   Turn ecu switch fully counter clockwise again and the procedure is finished.
   
   Remember, never start the engine in the entire procedure.
   
   -Poisonfist
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   It seems that later second gens (mostly 2001's) didn't have the white s***w to turn.
   
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