EVAP system

1997 NISSAN HARDBODY
110,000 MILES • 2.4L • 4 CYL • 2WD • AUTOMATIC
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G. FROSS
  • MEMBER
  • 5 POSTS
Shows code P450, which is EVAP pressure sensor switch. Switch checks out okay. Where do I go from here?
Nov 23, 2017 at 7:42 AM
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STEVE W.
  • CERTIFIED EXPERT
  • 15,113 POSTS
If the pressure sensor itself is okay, check the wiring back to the PCM, does it show rising/falling tank pressure on a scan tool while testing? It can also mean that it tried to do a test and the purge solenoid was commanded open but it did not actually open so the PCM thinks the sensor must be bad.
If you have a scan tool run a couple EVAP tests and see what does/does not work.
Nov 23, 2017 at 7:55 AM