Evap Canister Purge Solenoid Diagnosis - DodgeForum.com

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Evap Canister Purge Solenoid Diagnosis

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Old 06-21-2008, 12:48 PM
mills9 mills9 is offline
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Join Date: Mar 2005
Posts: 11
Default Evap Canister Purge Solenoid Diagnosis

Hello All,

I have a 1997 Ram 1500, 5.2L Auto 4x2. My MIL came on and after cycling the ignition switch on-off-on-off-on, I get code 31, which indicates a problem with the Evap Canister Purge Solenoid Circuit. How can I confirm that it's the solenoid that's bad, as opposed to an electrical problem? Do I test the voltage to the solenoid with the engine running and warmed up? Is it 12v that I'm looking for? Or can I just do a continuity test on the solenoid itself (with electrical disconnected)? Thanks for any help!
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Old 09-10-2008, 10:10 PM
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Keegan Keegan is offline
Join Date: May 2008
Vehicle: 1995 Dodge Ram 1500 4x4 5 spd
Location: Ontario, Canada
Posts: 243

I have the same code and was also wondering what I can do to get rid of it. Maybe just go to the wreckers and price a used solenoid?
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Old 09-11-2008, 10:44 AM
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Gary-L Gary-L is offline
Join Date: May 2005
Vehicle: 2007 Ram 1500 4x2 Big Horn aka The Silver Bullet
Location: Norman, Okla-mobile-homa
Posts: 8,401

Don't believe it could be a faulty solenoid. I get the error from time to time and it's because I've had fuel "waterlog" my charcoal filter. One of these days, I'm going to replace the charcoal and filter element.
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Old 09-11-2008, 10:50 AM
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cars01010 cars01010 is offline
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Vehicle: Lots of mopars
Location: Saratoga N.Y.
Posts: 9

The Powertrain Control Module (PCM) operates the EVAP/Purge solenoid by providing a ground path on circuit K52. Circuit K52 connects to PCM cavity C20. Circuit F18 supplies battery voltage to the EVAP/Purge solenoid.

In the RUN or START position, the ignition switch connects circuit A1 from the Power Distribution Center (PDC) and circuit A21. Circuit A21 feeds circuit F18 through fuse 9 in the fuse block.
Circuit F18 splices to supply battery voltage to the EGR solenoid and connects to cavity A2 of the PCM.
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Old 09-20-2011, 09:32 AM
Worme Worme is offline
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Join Date: Sep 2011
Posts: 1

I know this is a old post but was the issue solved and what was done? I am having this trouble and it is comming and going.
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