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 Post subject: Have I diagnosed bad tank pressure sensor correctly?
PostPosted: Sun Aug 06, 2017 4:03 pm 
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I am merely driving my van
I am merely driving my van

Joined: Wed May 18, 2016 4:01 pm
Posts: 24
Hope I got the right section.

Over time I've been looking at the potential causes for a P0446 EVAP code. I've replaced the gas cap, and bench tested the vent valve which it appears to be fine. Yesterday I pulled the fuel tank pressure sensor, but left it still wired up. The reference wire had its 5 volts, and the signal wire had 4.78 volts in free air. I applied the slightest vacuum (5 in.-Hg) and then equal positive pressure to the sensor with a mityvac and the voltage on the signal wire to ground did not ever budge from 4.78. It appears to be stuck there. Unless I am misunderstanding how it works, it must be bad? Thanks in advance for any help.

2001 AWD, 212K miles.


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 Post subject: Re: Have I diagnosed bad tank pressure sensor correctly?
PostPosted: Thu Aug 10, 2017 2:39 pm 
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I finally get the smurf thing

Joined: Sun Nov 14, 2010 8:09 pm
Posts: 143
No change on the signal wire with pressure change = bad sensor.

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 Post subject: Re: Have I diagnosed bad tank pressure sensor correctly?
PostPosted: Thu Aug 10, 2017 11:29 pm 
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I am merely driving my van
I am merely driving my van

Joined: Wed May 18, 2016 4:01 pm
Posts: 24
Excellent. Thanks for answering.


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