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Old 11-03-2018, 02:49 PM   #1
Ski-Free
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Member#: 492450
Join Date: Oct 2018
Location: AB, Canada
Vehicle:
2006 Forester - NA

Angry P0459 Code (EVAP Problems)

Hey guys, was hoping I could get your thoughts diagnosing this code. Iíve been trying to fix my small EVAP leak and just replaced the purge control solenoid (under the hood) and am now getting a high volatage code for it.

I took my multi meter to it and found the follow:

- very small resistance between harness terminals (35 ohms I believe)

- 12 V coming from one terminal and 0V on the other with the car off

- cycling 4.5V on/off from other terminal when car is on and in test mode

- stripped the cover from the wires about 5 inches to look for shorts and didnít find anything

- car throws a high voltage code when harness is plugged into solenoid and a low voltage code when itís unplugged.

Am I correct assuming there is a short?

Also on a side note is it possible to just disable the EVAP codes completely? Iíve been chasing this issue for 5 months now and getting nowhere.

Thanks!
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Old 11-03-2018, 02:56 PM   #2
Ski-Free
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I should add that solenoid does not function in test mode either but does function when I bench test it...
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Old 11-05-2018, 01:27 PM   #3
yarrgh
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Chapter/Region: RMIC
Location: Denver
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2001 2.5RS
Black Diamond Pearl

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Sounds like a bad part. Wouldn't be the first time that something new failed right out of the box.
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Old 11-05-2018, 01:40 PM   #4
Charlie-III
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Join Date: Dec 2002
Chapter/Region: Tri-State
Location: USA, North NJ, 07456
Vehicle:
1998 Legacy 2.5GT
Silver Sleeper BK, 5MT

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Quote:
Originally Posted by yarrgh View Post
Sounds like a bad part. Wouldn't be the first time that something new failed right out of the box.
Sounds like it works......on a bench.......

Quote:
Originally Posted by Ski-Free View Post
I should add that solenoid does not function in test mode either but does function when I bench test it...
You appear to have a harness issue, keep tracing back to find it. Quick would be to check any plug in connection upstream.
Seems like you have correct volts unloaded, but volts drop with any load. Could be a semi broken wire, corrosion, etc.
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Old 11-07-2018, 10:53 AM   #5
Ski-Free
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Quote:
Originally Posted by Charlie-III View Post
Sounds like it works......on a bench.......



You appear to have a harness issue, keep tracing back to find it. Quick would be to check any plug in connection upstream.
Seems like you have correct volts unloaded, but volts drop with any load. Could be a semi broken wire, corrosion, etc.
Mechanic seems to think it is an ECU problem but I am having a hard time believing this... I will trace the ground wire back to the ECU. When grounded there should be very little resistance between this wire and the negative battery terminal correct?

Unfortunately it's -20C out nowadays so I might be slow on troubleshooting this until I get a garage.

One weird thing I noticed is that I will get a rough start after filling up when the harness is plugged in leading me to believe that the valve is allowing vapors to be pushed into the manifold when it should be closed.
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Old 08-29-2019, 04:12 PM   #6
Ski-Free
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2006 Forester - NA

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Disabled the codes using this guide:

https://www.romraider.com/forum/view...145987#p145987
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Old 08-29-2019, 11:10 PM   #7
08SpecB_DE
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Location: Delaware
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2008 Legacy GT spec
DGM

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What brand part did you install? Did you check terminal tension? If you can command the purge on with a scanner, use a light bulb as a load in place of the solenoid. Does it light up when commanded on? If not, are you missing power or ground? I'd have to see a wiring diagram but if the ecu controls ground and you have no ground, probe into that ground wire at the ecu and supply your own ground. If the bulb now lights up, it's the ecu. If it does not light up, check for a broken wire. One thing to remember, new only means shiny, that new purge could be bad. Check ohms specs for the purge and compare to what you have.
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Old 09-09-2019, 02:03 PM   #8
Ski-Free
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Location: AB, Canada
Vehicle:
2006 Forester - NA

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Quote:
Originally Posted by 08SpecB_DE View Post
What brand part did you install? Did you check terminal tension? If you can command the purge on with a scanner, use a light bulb as a load in place of the solenoid. Does it light up when commanded on? If not, are you missing power or ground? I'd have to see a wiring diagram but if the ecu controls ground and you have no ground, probe into that ground wire at the ecu and supply your own ground. If the bulb now lights up, it's the ecu. If it does not light up, check for a broken wire. One thing to remember, new only means shiny, that new purge could be bad. Check ohms specs for the purge and compare to what you have.
Iím thinking the new purge valve is faulty but just got sick of not having cruise control due to the CEL light so I edited the ROM to remove the DTCís. Might get around to swapping the valve sometime and will go through what youíve suggested. Thanks!
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