EVAP system

Tiny
G. FROSS
  • MEMBER
  • 1997 NISSAN HARDBODY
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 110,000 MILES
Shows code P450, which is EVAP pressure sensor switch. Switch checks out okay. Where do I go from here?
Thursday, November 23rd, 2017 AT 7:42 AM

1 Reply

Tiny
STEVE W.
  • MECHANIC
  • 13,002 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.
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Thursday, November 23rd, 2017 AT 7:55 AM

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